WO2001047238A2 - Distributed, interactive television program guide; system and method - Google Patents

Distributed, interactive television program guide; system and method Download PDF

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Publication number
WO2001047238A2
WO2001047238A2 PCT/US2000/035152 US0035152W WO0147238A2 WO 2001047238 A2 WO2001047238 A2 WO 2001047238A2 US 0035152 W US0035152 W US 0035152W WO 0147238 A2 WO0147238 A2 WO 0147238A2
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WO
WIPO (PCT)
Prior art keywords
title
program
searching
database
index
Prior art date
Application number
PCT/US2000/035152
Other languages
French (fr)
Other versions
WO2001047238A3 (en
Inventor
Brian Beach
Alan Waterman
Original Assignee
Tivo, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tivo, Inc. filed Critical Tivo, Inc.
Priority to AU27366/01A priority Critical patent/AU2736601A/en
Priority to US10/168,839 priority patent/US7228556B2/en
Priority to JP2001547844A priority patent/JP4870305B2/en
Priority to EP00990325.3A priority patent/EP1250799B1/en
Publication of WO2001047238A2 publication Critical patent/WO2001047238A2/en
Publication of WO2001047238A3 publication Critical patent/WO2001047238A3/en
Priority to US11/757,958 priority patent/US8181203B2/en
Priority to US13/472,369 priority patent/US9060099B2/en
Priority to US15/711,729 priority patent/US20180234737A1/en

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Classifications

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    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
    • H04N21/466—Learning process for intelligent management, e.g. learning user preferences for recommending movies
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    • G06F16/78—Retrieval characterised by using metadata, e.g. metadata not derived from the content or metadata generated manually
    • G06F16/7867—Retrieval characterised by using metadata, e.g. metadata not derived from the content or metadata generated manually using information manually generated, e.g. tags, keywords, comments, title and artist information, manually generated time, location and usage information, user ratings
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    • H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
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Definitions

  • the invention relates generally to a network-based video recording system.
  • the invention relates to a method and apparatus for searching a client-side database of program guide information to identify program items of interest.
  • the invention provides a method and apparatus for searching a database of program information in an interactive, network-based video recording system, in order to identify programs of interest.
  • a viewer enters search terms using a virtual alphanumeric keypad displayed in a viewer interface by means of a remote control.
  • the viewer may search according to program title, indexed attributes such as category, actor, and director; or a key word search allows the viewer to search by program content or subject matter.
  • a prefix matching capability provides a type-ahead feature, so that search terms may be rapidly located in the appropriate index simply by entering one or more of the leading characters of the search term.
  • Figure 1 shows a block diagram of an interactive, network-based video recording system, according to the invention
  • Figure 2 shows a top-level screen of a viewer interface for searching an interactive program guide, according to the invention
  • Figure 3 shows a screen from the viewer interface of Figure 2 for searching by title, according to the invention
  • Figure 4 shows an alphanumeric keypad for searching by title, according to the invention
  • Figure 5 shows an alphanumeric keypad for searching by actor name, according to the invention
  • Figure 6 shows a category list for narrowing an actor name search, according to the invention
  • Figure 7 shows an alphanumeric keypad for searching by keyword, according to the invention.
  • Figure 8 shows a category list for narrowing a keyword search, according to the invention.
  • a searchable program guide is provided to facilitate the task of identifying programs of interest by the viewer.
  • a viewer interface 1 to a client unit 3 provides a series of interactive screens that incorporate interface elements such as text boxes, searchable lists, selection bars, and alphanumeric keypads.
  • the viewer navigates the interface and generally interacts with the system by means of a hand-held remote control 4 that communicates with the client unit by means of a data signal 5.
  • the data signal is embedded in an IR carrier signal, but other carrier signals known to those skilled in the art of wireless data transfer would also be suitable.
  • the interface is displayed on the screen of a television set 2 connected to the client unit. However, other display means would also be suitable.
  • the client unit is in periodic contact 6 (the arrows denoting the network connection are dashed to indicate the intermittent nature of the connection) with a server 7, during which time, current program information, originating from a vendor, is downloaded to the client unit. After downloading, the program information is imported into a database application resident on a fixed storage medium such as a disk drive.
  • a server 7 a server 7
  • the program information is imported into a database application resident on a fixed storage medium such as a disk drive.
  • the current embodiment of the invention employs an object-oriented database application, but other types of database applications, such as relational databases, would also be suitable.
  • a selection bar 21 highlights the various search options available.
  • the first option 22 allows the viewer to search the program guide according to program title.
  • a second option 23 allows the user to create search profiles that search according to actor name, director name, category and key word.
  • expanded search functionality may include indices for year of release, language, choreographer, or any other program attribute that could be indexed. Navigating arrows 24 advise the viewer of the navigation options available.
  • a 'right' arrow 24a navigates the viewer to a screen ( Figure 3) for searching by title; a 'down' arrow 24b allows the viewer to scroll through the list of provided options; and a 'left' arrow 24c navigates the viewer back to the previous screen. If the selection bar were positioned farther down in the list of options, an 'up' arrow (not shown) would permit the viewer to scroll up the list.
  • the 'up,' 'down,' 'right' and 'left' arrows are operated by pressing corresponding buttons on the handheld remote control 4. In the example of Figure 2, the viewer selects 'Search by title' 22.
  • a screen 30 is shown that gives the viewer the option of narrowing a title search according to program category, or not, according to the viewer's need or desire.
  • the search is performed in the entire program database.
  • Selecting a category 32 limits the search to programs defined by the corresponding category descriptor. Limiting a search by category would be most useful when the viewer is browsing for a program of particular type. If the viewer desired to maximize retrieval, or if they were searching for a specific program for which they knew at least a portion of the title, limiting by program category might be less useful.
  • FIG. 4 Shown is a screen 40 displaying a virtual alphanumeric keyboard 41 and a text box 44.
  • the viewer uses the navigation controls (not shown) on the remote control to position a selection marquee 48 around the character of choice.
  • the selection marquee When the selection marquee is properly positioned at the desired character, the viewer presses a 'select' button, upon which the selected character appears in the text box 44.
  • the viewer continues selecting characters, until they have entered at least a portion of the program title in the text box.
  • 'Clear,' 'space' and 'delete' functions 45, 46 and 47, respectively, are provided for clearing the box, inserting a space between words, and deleting single characters.
  • Prefix matching gives the screen a type-ahead capability.
  • the title list 42 automatically scrolls to the program items having prefixes that match the character string entered by the viewer.
  • the directional arrows 24a - d advise the user of the navigation options available to them.
  • the selection marquee is positioned around the character in the rightmost column of the keypad 41. In this case, navigating to the right would cause focus to shift from the keypad to the title list 42.
  • 'Up' and 'down' arrows 43a and b indicate that the viewer may scroll up or down in the title list.
  • the viewer may create search profiles in which they search according to indexed program attributes or keywords.
  • Program attributes may include actor name, director name, category, choreographer, language, year of release, and the like.
  • Figure 5 shows a screen 50 for searching according to actor name. It should be noted that searching according to indexed attributes or key word requires the creation of a search profile. When the search profile is created, it may be saved and named.
  • Figure 6 shows, following entry of an actor name, a screen 60 allows the user to narrow a search according to category, if desired. Another set of screens (not shown) is provided for searching according to director name.
  • Figures 7 and 8 show screens 70 and 80 for searching according to key word and narrowing according to category, respectively.
  • keyword searching requires the creation of a search profile.
  • key words are extracted from actor and director names, titles and a narrative program description.
  • the key word search feature is highly advantageous in that it provides an important additional access point not found in conventional program guides. It is a well-known problem to those skilled in the design of publicly accessible information retrieval systems that it is impossible to anticipate a user's search behavior with complete certainty. Thus, no matter how skillfully indexed an information base may be, it will be unable to accommodate the information-seeking behavior of all users. Therefore, to provide a system that delivers maximum serviceability to its constituency, it is highly desirable to provide as many different access points as possible.
  • the current invention provides an important, highly flexible means of accessing program content and subject matter outside of the indexed attributes.
  • the video recording system of the present invention is network-based, consisting of a central server, and a plurality of client units, each client being in periodic communication with the server.
  • the network connection is a dial-up connection over a publicly available telecommunication network.
  • other network connections a wireless connection, for example, would be equally suitable.
  • the client is in communication with the server for a brief period on a daily basis. During the daily connection period, the client downloads current program guide data. The downloaded program information is imported into an object-oriented database resident on the client. As previously indicated, when a viewer searches the database to find programs of interest, they may search by program name, by indexed attributes such as actor name or director name; and by keyword.
  • the database is indexed, and searches are conducted on the provided index files, greatly improving search efficiency.
  • the title search feature is concerned primarily with the 'Series' object.
  • the attribute search and key word search features are concerned primarily with the 'Program' object.
  • the 'Series' object includes a record for each television series. For the title search, the most important field of the 'Series' object is the series Title' field.
  • the attribute search and the key word search are concerned primarily with the 'Program' object.
  • the 'Program' object includes a record for each individual program item, where an individual program item might be a single episode of a series, for example.
  • The' Program' object includes at least the following fields:
  • Information is extracted from the individual records and assembled into a series of index files.
  • a Title' index is constructed.
  • 'Actor' and 'Director' indices are built.
  • key word search a 'Key word' index and a 'Title word' index are provided.
  • the process of indexing the database includes the following steps:
  • the entire series title is extracted as a text string from the 'Title' field of each 'Series' record, with each text string constituting a separate index term, or key.
  • each name is extracted from the 'Actors,' 'Hosts' and 'Guest stars' fields of the 'Program' records, with each name from each record constituting a separate actor key.
  • each name is extracted from the 'Directors' field, with each name from each record constituting a separate director key.
  • each separate word having a length of at least two characters, of each title from both the Title' and 'Episode title' fields is extracted, with each separate word constituting a separate title word.
  • each separate word having a length of at least two characters is extracted from the 'Description' field, with each occurrence of each word constituting a separate key word.
  • the keys are assembled into intermediate files: one for each of Ttitle,' 'Actor,' 'Director,' Title word' and 'Key word'.
  • the 'Title' intermediate file includes the Title' keys
  • the 'Actor' intermediate file includes the 'Actor,' 'Host' and 'Guest star' keys
  • the 'Director' intermediate file includes the 'Director' keys, with the names in the 'Actor' and 'Director' keys listed directory style: last name and first name, separated by a comma.
  • the 'Title word' file includes the title words extracted form the Title' and 'Episode title' fields of the 'Program' object.
  • the 'Key word' file is constructed differently from the previous intermediate files. Each key word forms a separate entry in the 'Key word' file. Additionally, actor names are incorporated into the 'Key word' index. The actor names are parsed into separate first and last names, and then added to the 'Key word' intermediate file.
  • the 'Key word' fi e includes the words from the,' 'Description' field and the name words from the 'Actors,' 'Hosts' and 'Guest stars' fields.
  • the end result of this step is an intermediate file for each of 'Title,' 'Actor,' 'Director,' Title word' and 'Key word,' each comprising a simple listing of the respective keys or index terms, in a text file.
  • the intermediate files are subsequently used to build raw, unsorted index files.
  • Each key of the intermediate files described above is paired with a program identifier that corresponds to the record that the key originated from.
  • the program identifier is a system-generated, alphanumeric identifier, distinct from the program identifiers assigned by commercial programming information vendors such as TRIBUNE MEDIA SERVICES.
  • the raw index files take the form of delimited text files; however other data structures, such as tables, would be equally suitable.
  • the files are formatted as follows:
  • a binary search algorithm is employed to search the indices, requiring that the index be sorted.
  • the raw index files are sorted on the keys.
  • the sorted index files are subsequently compressed by eliminating redundant keys, so that each distinct key is paired with a list of the program identifiers corresponding to each occurrence of the key in the database.
  • the compressed index files are also delimited text files, formatted as follows: CAT ⁇ TAB> ⁇ ID 1 , ID 2 , . -, ID N >
  • SEARCH ALGORITHM A search engine employing a binary search algorithm is used to search the various indices.
  • the binary algorithm begins with an interval covering the whole search space.
  • the search space is repeatedly divided in half according to how the search value compares with the middle element. If the search value is less than the item in the middle of the interval, the interval is narrowed to the lower half; otherwise it is narrowed to the other half. The operation is performed until the search value is found or the interval is empty.
  • the key word search includes title words. Therefore, during a key word search, a binary search of both the 'Keyword' index and the 'Title word' index is performed.

Abstract

In an interactive network-based personal video recording system, a user interface (1) is provided that allows viewers to search a database (7) of program guide information according to program title, indexed program attributes such as actor and director, and key workd. Viewer interaction is by way of a remote control unit (4).

Description

DISTRIBUTED, INTERACTIVE TELEVISION PROGRAM GUIDE; SYSTEM AND METHOD
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
The invention relates generally to a network-based video recording system.
More particularly, the invention relates to a method and apparatus for searching a client-side database of program guide information to identify program items of interest.
DESCRIPTION OF RELATED ART The number of programming options available to television viewers is constantly increasing, with television programming now available from the major networks, cable channels, satellite, pay-per-view, community access television, and so on. Paralleling this growing availability of television programming is a decrease in the amount of leisure time viewers have for watching television; due to job demands, time spent commuting, family responsibilities and the like. Because of these severe schedule constraints, the complaint is pervasive among viewers that "There's nothing on" when they do have time for television viewing, in spite of the unprecedented availability of television entertainment. This complaint is more a result of the difficulty of matching one's own schedule to network television schedules than it is due to quality or availability of television programming. The ability provided by VCR's and other recording devices to make automatic, unattended recordings of television programs has freed viewers from the dictates of network scheduling.
However, the viewer is still faced with the time-consuming chore of examining schedules for literally hundreds of television channels to identify programs of interest. As a result, electronic program guides have been developed to help viewers deal with the mass of programming information. Typically, such guides are provided in cable and satellite television environments. The progrim information is presented in a grid format, organized by time slot arid channel. The guide is displayed by scrolling across the screen. However, these guides are not interactive; they cannot be searched, nor can the viewer control the display of information in any way. The viewer must simply passively watch the information scroll by, hoping that something useful or interesting will pass by.
Searchable program guides are now available. For example, S. Schein, J. Leftwich, Method and apparatus for searching a guide using program characteristics, U.S. Patent No. 6,133,909 (October 17, 2000) describe a searchable program guide that allows a viewer to search according to program attributes such as actors or directors. The guide described by Schein, et al. eases the viewer's task of locating programs of interest. Unfortunately, the described guide only allows the user to search the guide according to indexed attributes, such as actor or director. However, indexed attributes often fail to anticipate a user's search behavior. Thus, Schein, et al. do not provide the user with any way to search outside of those indexed attributes.
From the foregoing, it is apparent that an interactive program guide that affords the viewer more flexible search options would be a significant technological advance.
SUMMARY OF THE INVENTION
The invention provides a method and apparatus for searching a database of program information in an interactive, network-based video recording system, in order to identify programs of interest. A viewer enters search terms using a virtual alphanumeric keypad displayed in a viewer interface by means of a remote control. The viewer may search according to program title, indexed attributes such as category, actor, and director; or a key word search allows the viewer to search by program content or subject matter. A prefix matching capability provides a type-ahead feature, so that search terms may be rapidly located in the appropriate index simply by entering one or more of the leading characters of the search term.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 shows a block diagram of an interactive, network-based video recording system, according to the invention;
Figure 2 shows a top-level screen of a viewer interface for searching an interactive program guide, according to the invention;
Figure 3 shows a screen from the viewer interface of Figure 2 for searching by title, according to the invention;
Figure 4 shows an alphanumeric keypad for searching by title, according to the invention;
Figure 5 shows an alphanumeric keypad for searching by actor name, according to the invention;
Figure 6 shows a category list for narrowing an actor name search, according to the invention;
Figure 7 shows an alphanumeric keypad for searching by keyword, according to the invention; and
Figure 8 shows a category list for narrowing a keyword search, according to the invention. DETAILED DESCRIPTION
In an interactive, network-based video recording system, a searchable program guide is provided to facilitate the task of identifying programs of interest by the viewer. As shown in Figure 1 , a viewer interface 1 to a client unit 3 provides a series of interactive screens that incorporate interface elements such as text boxes, searchable lists, selection bars, and alphanumeric keypads. The viewer navigates the interface and generally interacts with the system by means of a hand-held remote control 4 that communicates with the client unit by means of a data signal 5. In the preferred embodiment, the data signal is embedded in an IR carrier signal, but other carrier signals known to those skilled in the art of wireless data transfer would also be suitable. Typically, the interface is displayed on the screen of a television set 2 connected to the client unit. However, other display means would also be suitable. The client unit is in periodic contact 6 (the arrows denoting the network connection are dashed to indicate the intermittent nature of the connection) with a server 7, during which time, current program information, originating from a vendor, is downloaded to the client unit. After downloading, the program information is imported into a database application resident on a fixed storage medium such as a disk drive. The current embodiment of the invention employs an object-oriented database application, but other types of database applications, such as relational databases, would also be suitable.
Referring now to Figure 2, shown is a top-level screen 20 to the search interface. A selection bar 21 highlights the various search options available. The first option 22, allows the viewer to search the program guide according to program title. A second option 23, allows the user to create search profiles that search according to actor name, director name, category and key word. In addition, other search options are possible. For example, expanded search functionality may include indices for year of release, language, choreographer, or any other program attribute that could be indexed. Navigating arrows 24 advise the viewer of the navigation options available. For example, in Figure 2, a 'right' arrow 24a navigates the viewer to a screen (Figure 3) for searching by title; a 'down' arrow 24b allows the viewer to scroll through the list of provided options; and a 'left' arrow 24c navigates the viewer back to the previous screen. If the selection bar were positioned farther down in the list of options, an 'up' arrow (not shown) would permit the viewer to scroll up the list. The 'up,' 'down,' 'right' and 'left' arrows are operated by pressing corresponding buttons on the handheld remote control 4. In the example of Figure 2, the viewer selects 'Search by title' 22.
Referring now to Figure 3, a screen 30 is shown that gives the viewer the option of narrowing a title search according to program category, or not, according to the viewer's need or desire. By selecting the 'all programs' option, the search is performed in the entire program database. Selecting a category 32, limits the search to programs defined by the corresponding category descriptor. Limiting a search by category would be most useful when the viewer is browsing for a program of particular type. If the viewer desired to maximize retrieval, or if they were searching for a specific program for which they knew at least a portion of the title, limiting by program category might be less useful.
After choosing a category, the user is navigated to a screen as shown in Figure 4. Shown is a screen 40 displaying a virtual alphanumeric keyboard 41 and a text box 44. The viewer uses the navigation controls (not shown) on the remote control to position a selection marquee 48 around the character of choice. When the selection marquee is properly positioned at the desired character, the viewer presses a 'select' button, upon which the selected character appears in the text box 44. The viewer continues selecting characters, until they have entered at least a portion of the program title in the text box. 'Clear,' 'space' and 'delete' functions 45, 46 and 47, respectively, are provided for clearing the box, inserting a space between words, and deleting single characters. Prefix matching gives the screen a type-ahead capability. Thus, as the viewer enters characters, the title list 42 automatically scrolls to the program items having prefixes that match the character string entered by the viewer. As described previously, the directional arrows 24a - d advise the user of the navigation options available to them. As shown in Figure 4, the selection marquee is positioned around the character in the rightmost column of the keypad 41. In this case, navigating to the right would cause focus to shift from the keypad to the title list 42. 'Up' and 'down' arrows 43a and b indicate that the viewer may scroll up or down in the title list.
As described above, the viewer may create search profiles in which they search according to indexed program attributes or keywords. Program attributes may include actor name, director name, category, choreographer, language, year of release, and the like. Figure 5 shows a screen 50 for searching according to actor name. It should be noted that searching according to indexed attributes or key word requires the creation of a search profile. When the search profile is created, it may be saved and named.
Interaction with the search screen 50 is analogous to that previously described for the title entry screen, thus it will not be further described. As
Figure 6 shows, following entry of an actor name, a screen 60 allows the user to narrow a search according to category, if desired. Another set of screens (not shown) is provided for searching according to director name.
Their appearance and function is analogous to those for searching according to actor name, thus they will not be further described.
Figures 7 and 8 show screens 70 and 80 for searching according to key word and narrowing according to category, respectively. As previously described, keyword searching requires the creation of a search profile. As will be described below, key words are extracted from actor and director names, titles and a narrative program description.
The key word search feature is highly advantageous in that it provides an important additional access point not found in conventional program guides. It is a well-known problem to those skilled in the design of publicly accessible information retrieval systems that it is impossible to anticipate a user's search behavior with complete certainty. Thus, no matter how skillfully indexed an information base may be, it will be unable to accommodate the information-seeking behavior of all users. Therefore, to provide a system that delivers maximum serviceability to its constituency, it is highly desirable to provide as many different access points as possible. By including a key word search feature, the current invention provides an important, highly flexible means of accessing program content and subject matter outside of the indexed attributes.
The method of interacting with the key word search screens is exactly analogous to the screens previously described. Thus, they will not be further described.
INDEXI NG
As previously noted, the video recording system of the present invention is network-based, consisting of a central server, and a plurality of client units, each client being in periodic communication with the server. In the preferred embodiment of the invention, the network connection is a dial-up connection over a publicly available telecommunication network. However, other network connections, a wireless connection, for example, would be equally suitable. In the preferred embodiment of the invention, the client is in communication with the server for a brief period on a daily basis. During the daily connection period, the client downloads current program guide data. The downloaded program information is imported into an object-oriented database resident on the client. As previously indicated, when a viewer searches the database to find programs of interest, they may search by program name, by indexed attributes such as actor name or director name; and by keyword. A direct, sequential search of the records in the database objects would be prohibitively time-consuming and would waste system resources, unfavorably affecting the usability of the program guide. Thus, the database is indexed, and searches are conducted on the provided index files, greatly improving search efficiency. While the database may include other objects, the title search feature is concerned primarily with the 'Series' object. The attribute search and key word search features are concerned primarily with the 'Program' object. The 'Series' object includes a record for each television series. For the title search, the most important field of the 'Series' object is the series Title' field. The attribute search and the key word search are concerned primarily with the 'Program' object. The 'Program' object includes a record for each individual program item, where an individual program item might be a single episode of a series, for example. The' Program' object includes at least the following fields:
Title;
Episode title; Description; • Actors
Hosts;
Guest stars; and Directors.
The above list is not intended to be limiting. Other record configurations consistent with the spirit and scope of the invention are possible. Information is extracted from the individual records and assembled into a series of index files. For the title search feature, a Title' index is constructed. For the attribute search feature, 'Actor' and 'Director' indices are built. Finally, for the key word search, a 'Key word' index and a 'Title word' index are provided.
Generally, the process of indexing the database includes the following steps:
• Extracting index terms from the database records;
• Constructing intermediate files from the extracted index terms; • Creating raw, unsorted index files from the intermediate files;
• Sorting the raw index files; and
• Compressing the sorted files to form final index files. The several steps of the indexing process are described in greater detail below.
For the 'Title' index, the entire series title is extracted as a text string from the 'Title' field of each 'Series' record, with each text string constituting a separate index term, or key.
For the 'Actor' index, each name is extracted from the 'Actors,' 'Hosts' and 'Guest stars' fields of the 'Program' records, with each name from each record constituting a separate actor key. Similarly, for the 'Director' index, each name is extracted from the 'Directors' field, with each name from each record constituting a separate director key.
For the Title word' index, each separate word, having a length of at least two characters, of each title from both the Title' and 'Episode title' fields is extracted, with each separate word constituting a separate title word. For the 'Key word' index, each separate word having a length of at least two characters is extracted from the 'Description' field, with each occurrence of each word constituting a separate key word.
Following key extraction, the keys are assembled into intermediate files: one for each of Ttitle,' 'Actor,' 'Director,' Title word' and 'Key word'. The 'Title' intermediate file includes the Title' keys, the 'Actor' intermediate file includes the 'Actor,' 'Host' and 'Guest star' keys, and the 'Director' intermediate file includes the 'Director' keys, with the names in the 'Actor' and 'Director' keys listed directory style: last name and first name, separated by a comma. The 'Title word' file includes the title words extracted form the Title' and 'Episode title' fields of the 'Program' object. The 'Key word' file, however, is constructed differently from the previous intermediate files. Each key word forms a separate entry in the 'Key word' file. Additionally, actor names are incorporated into the 'Key word' index. The actor names are parsed into separate first and last names, and then added to the 'Key word' intermediate file. Thus the 'Key word' fi e includes the words from the,' 'Description' field and the name words from the 'Actors,' 'Hosts' and 'Guest stars' fields. The end result of this step is an intermediate file for each of 'Title,' 'Actor,' 'Director,' Title word' and 'Key word,' each comprising a simple listing of the respective keys or index terms, in a text file.
The intermediate files are subsequently used to build raw, unsorted index files. Each key of the intermediate files described above is paired with a program identifier that corresponds to the record that the key originated from. The program identifier is a system-generated, alphanumeric identifier, distinct from the program identifiers assigned by commercial programming information vendors such as TRIBUNE MEDIA SERVICES. The raw index files take the form of delimited text files; however other data structures, such as tables, would be equally suitable. In the preferred embodiment of the invention, the files are formatted as follows:
<KEY> <TAB> <PROG ID>
<KEY> <TAB> <PROG ID>.
As will be described further below, a binary search algorithm is employed to search the indices, requiring that the index be sorted. Thus, the raw index files are sorted on the keys.
The sorted index files are subsequently compressed by eliminating redundant keys, so that each distinct key is paired with a list of the program identifiers corresponding to each occurrence of the key in the database. In the preferred embodiment of the invention, the compressed index files are also delimited text files, formatted as follows: CAT <TAB> <ID1, ID2, . -, IDN>
LASER <TAB> <ID1, ID2, . ... IDN>
STAR <TAB> <ID1, ID2, . ., IDN>
TREK ^ABxlD^ ID2, .. ,., IDN>,
Where 'cat,' aser,' 'star' and 'trek' might be title words or key words and 'ID^ ID2, ..., IDN' is a list of program identifiers for each unique key.
SEARCH ALGORITHM A search engine employing a binary search algorithm is used to search the various indices. In general, the binary algorithm begins with an interval covering the whole search space. The search space is repeatedly divided in half according to how the search value compares with the middle element. If the search value is less than the item in the middle of the interval, the interval is narrowed to the lower half; otherwise it is narrowed to the other half. The operation is performed until the search value is found or the interval is empty.
As described above, the key word search includes title words. Therefore, during a key word search, a binary search of both the 'Keyword' index and the 'Title word' index is performed.
Although the invention has been described herein with reference to certain preferred embodiments, one skilled in the art will readily appreciate that other applications may be substituted without departing from the spirit and scope of the present invention. Accordingly, the invention should only be limited by the Claims included below.

Claims

CLAI MSWhat is claimed is:
1. A system for searching a distributed, interactive television program guide database, wherein a viewer searches said database to identify programs of interest, said system comprising: a server; a client, wherein said client is in periodic communication with said server, and wherein said client downloads current program information from said server; a program guide database resident on said client, wherein said program information is imported into said database; an interactive viewer interface displayed on a display means in communication with said client; means for interacting with said viewer interface by said viewer; means for searching said database according to program title; means for searching said database according to indexed program attributes; and means for searching said database according to key words.
2. The system of Claim 1 , wherein said system is a component of an interactive, network-based video recording system.
3. The system of Claim 1 , wherein said interface comprises a plurality of screens having interface elements for navigation, entering search values and displaying search results.
4. The system of Claim 3, wherein said means for interacting with said interface comprises a remote control unit, said remote control unit communicating with said client by means of a data signal.
5. The system of Claim 4, wherein said data signal is embedded in a carrier signal.
6. The system of Claim 4, wherein said means for searching said database according to program title comprises a screen for optionally selecting a program category.
7. The system of Claim 5, wherein said means for searching said database according to program title further comprises a screen for entering a program title and displaying a list of program titles, said screen for entering a program title comprising: a virtual alphanumeric keypad for entering characters to spell said program title; a text box for displaying said entered characters; and a scrollable list of program titles, wherein a prefix matching feature causes said list of program titles to automatically scroll to titles in said list having prefixes that match a character string displayed in said text box.
8. The system of Claim 7, wherein said viewer enters characters by activating controls on said remote control that correspond to virtual controls on said keypad.
9. The system of Claim 4, wherein said means for searching said database according to indexed attributes comprises: a screen for searching according to Actor name; a screen for searching according to Director name; and separate screens preceding said Actor name screen and said Director name screen for optionally selecting a program category.
10. The system of Claim 9, wherein said screen for searching according to Actor name comprises: a virtual alphanumeric keypad for entering characters to spell said Actor name; a text box for displaving said entered characters; and a scrollable list of ^tor names, wherein a prefix matching feature causes said list of Actor names to automatically scroll to Actor names in said list having prefixes that match a character string displayed in said text box.
11. The system of Claim 10, wherein said viewer enters characters by activating controls on said remote control that correspond to virtual controls on said keypad.
12. The system of Claim 9, wherein said screen for searching according to Director name comprises: a virtual alphanumeric keypad for entering characters to spell said Director name; a text box for displaying said entered characters; and a scrollable list of Director names, wherein a prefix matching feature causes said list of Director names to automatically scroll to Director names in said list having prefixes that match a character string displayed in said text box.
13. The system of Claim 12, wherein said viewer enters characters by activating controls on said remote control that correspond to virtual controls on said keypad.
14. The system of Claim 4, wherein said means for searching said database according to key word comprises a screen for optionally selecting a program category.
15. The system of Claim 14, wherein said means for searching said database according to key word further comprises a screen for entering a key word, said screen for entering a key word comprising: a virtual alphanumeric keypad for entering characters to spell said key word; and a text box for displaying said entered characters.
16. The system of Claim 15, wherein said viewer enters characters by activating controls on said remote control that correspond to virtual controls on said keypad.
17. The system of Claim 4, wherein said indexed attributes include any of: Actor name;
Director name;
Host name; Guest star name;
Choreographer;
Year of release;
Category; and
Language.
18. The system of Claim 1 , wherein said program guide database comprises an object-oriented database application, said database application including at least: a 'Series' object; and a 'Program' object.
19. The system of Claim 18, wherein said 'Series' object includes a series Title' field.
20. The system of Claim 19, wherein said program guide database further comprises a 'Title' index, said Title' index being built from entries in said 'Series' title field.
21. The system of Claim 20, wherein said means for searching said database according to program title comprises a search engine for searching said 'Title' index.
22. The system of Claim 18, wherein said 'Program' object includes fields for:
Title;
Episode title;
Description;
Actors
Hosts;
Guest stars; and
Directors.
23. The system of Claim 22, wherein said database further comprises an 'Actor' index, said 'Actor' index being built from entries in said 'Actors,' 'Hosts,' and 'Guest stars' fields.
24. The system of Claim 23, wherein said database further comprises a 'Director' index, said Director' index being built from entries in said 'Director' field.
25. The system of Claim 24, wherein said means for searching said database according to program attributes comprises a search engine for searching said 'Actor' and said 'Director' indices.
26. The system of Claim 18, wherein said database further comprises a Title word' index, said Title word' index being built from said 'Title' fields and said 'Episode title' fields.
27. The system of Claim 26, wherein said database further comprise a 'Key word' index, said 'Key word' index being built from words in said 'Description' field, said 'Actors' field, said 'Hosts' field and said 'Guest stars' field.
28. The system of Claim 27, wherein said means for searching said database according to key words comprises a search engine for searching said Title word' index and said 'Key word' index.
29. A method of searching a distributed, interactive television program guide database, wherein a viewer searches said program guide database to identify programs of interest, comprising the steps of: providing a server; providing a client, wherein said client is in periodic communication with said server, and wherein said client downloads current program information from said server; providing a program guide database resident on said client, wherein said program information is imported into said database; providing an interactive viewer interface displayed on a display means in communication with said client; providing means for interacting with said viewer interface by said viewer; and searching said database by said viewer according to at least one of: program title; indexed program attributes; and key words.
30. The method of Claim 29, wherein said system is a component of an interactive, network-based video recording system.
31. The method of Claim 29, wherein said interface comprises a plurality of screens having interface elements for navigation, entering search values and displaying search results.
32. The method of Claim 31 , wherein said means for interacting with said interface comprises a remote control unit, said remote control unit communicating with said client by means of a data signal.
33. The method of Claim 32, wherein said data signal is embedded in a carrier signal.
34. The method of Claim 32, wherein said step of searching said database according to program title comprises the steps of optionally, selecting a program category in a first screen; and entering a program title in a second screen, said second screen comprising: a virtual alphanumeric keypad for entering characters to spell said program title; a text box for displaying said entered characters; and a scrollable list of program titles, wherein a prefix matching feature causes said list of program titles to automatically scroll to titles in said list having prefixes that match a character string displayed in said text box.
35. The method of Claim 34, wherein said viewer enters characters by activating controls on said remote control that correspond to virtual controls on said keypad.
36. The method of Claim 32, wherein said step of searching said database according to indexed attributes comprises one of the steps of: searching according to Actor name; searching according to Director name; and optionally selecting a program category prior to either of said steps of searching according to Actor name or searching according to Director name.
37. The method of Claim 36, wherein a screen for searching according to Actor name comprises: a virtual alphanumeric keypad for entering characters to spell said
Actor name; a text box for displaying said entered characters; and a scrollable list of Actor names, wherein a prefix matching feature causes said list of Actor names to automatically scroll to Actor names in said list having prefixes that match a character string displayed in said text box.
38. The method of Claim 37, wherein said viewer enters characters by activating controls on said remote control that correspond to virtual controls on said keypad.
39. The method of Claim 36, wherein a screen for searching according to Director name comprises: a virtual alphanumeric keypad for entering characters to spell said
Director name; a text box for displaying said entered characters; and a scrollable list of Director names, wherein a prefix matching feature causes said list of Director names to automatically scroll to Director names in said list having prefixes that match a character string displayed in said text box.
40. The method of Claim 39, wherein said viewer enters characters by activating controls on said remote control that correspond to virtual controls on said keypad.
41. The method of Claim 32, wherein said step of searching said database according to key word comprises the steps of: optionally, selecting a program category from a first screen; and entering a key word in a second screen, said second screen comprising a virtual alphanumeric keypad for entering characters to spell said key word; and a text box for displaying said entered characters.
42. The method of Claim 41 , wherein said viewer enters characters by activating controls on said remote control that correspond to virtual controls on said keypad.
43. The method of Claim 32, wherein said indexed attributes include any of:
Actor name;
Director name;
Host name; Guest star name;
Choreographer;
Year of release;
Category; and
Language.
44. The method of Claim 29, wherein said program guide database comprises an object-oriented database application, said database application including at least: a 'Series' object; and a 'Program' object.
45. The method of Claim 44, wherein said 'Series' object includes a series Title' field.
46. The method of Claim 45, wherein said program guide database further comprises a Title' index, said 'Title' index being built from said series 'Title' field.
47. The method of Claim 46, wherein said means for searching said database according to program title comprises a search engine for searching said Title' index.
48. The method of Claim 44, wherein said 'Program' object includes fields for:
Title;
Episode title;
Description;
Actors
Hosts;
Guest stars; and
Directors.
49. The method of Claim 48, wherein said database further comprises an 'Actor' index, said 'Actor' index being built from said 'Actors,' 'Hosts', and 'Guest stars' fields.
50. The method of Claim 49, wherein said database further comprises a 'Director' index, said 'Director' index being built from entries in said 'Director' field.
51. The method of Claim 50, wherein said means for searching said database according to' Actor' or 'Director' or comprises a search engine for searching said 'Actor' and said 'Director' indices.
52. The method of Claim 44, wherein said database further comprises a 'Title word' index, said Title word' index being built from entries in said Title' fields and said 'Episode title' fields.
53. The method of Claim 52, wherein said database further comprise a 'Key word' index, said 'Key word' index being built from said words in said 'Description' field, said 'Actors' field, said 'Hosts' field and said 'Guest stars' field.
54. The method of Claim 53, wherein said means for searching said database according to ke/ words comprises a search engine for searching said 'Title word' index and said 'Key word' index.
PCT/US2000/035152 1999-12-21 2000-12-20 Distributed, interactive television program guide; system and method WO2001047238A2 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
AU27366/01A AU2736601A (en) 1999-12-21 2000-12-20 Distributed, interactive television program guide; system and method
US10/168,839 US7228556B2 (en) 1999-12-21 2000-12-20 Distributed, interactive television program guide; system and method
JP2001547844A JP4870305B2 (en) 1999-12-21 2000-12-20 Distributed interactive television program guide system and method
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US11/757,958 US8181203B2 (en) 1999-12-21 2007-06-04 Distributed, interactive television program guide; system and method
US13/472,369 US9060099B2 (en) 1999-12-21 2012-05-15 Distributed, interactive television program guide; system and method
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