AUDIO INFORMATION RECORDING
MEDIUM AND AUDIO INFORMATION
BACKGROUND OF THE INVENTION 5
1. Field of the Invention
The present invention relates to an information recording medium such as a DVD, on which a large amount of information such as images, sound, etc. can be recorded densely, and a reproducing apparatus to reproduce the infor- 10 mation recorded on the information recording medium.
2. Description of the Related Art
An LD (Laser Disk), a CD (Compact Disk), etc. are popular as an optical disc to record information such as images, sound, etc. thereon. 15
On such an LD or CD etc, image information and audio information are recorded together with time information, which represents a time to reproduce each of the image information and audio information on the basis of the reproduction starting point. Therefore, in the case of CD, it 20 is possible not only to reproduce the audio information in order of the recording arrangement but also to reproduce only some pieces of audio information that the user wants to listen. Furthermore, it is possible to reproduce audio information in random order. 25
However, the user have no choice with respect to contents of images to be displayed or contents of sound to be reproduce. For example, when watching pictures or movies, the user cannot choose the subtitles. When listening music,
the user cannot choose the sound, voice or language (e.g. lyrics). This is a disadvantage of the conventional optical disc, LD or CD. That is, the LD or CD does not has the capability of interactive selection or the capability that many choices are given to the user.
On the other hand, a DVD, which is a kind of optical disk, has been proposed and now actively developed. The DVD has the same size as that of the CD, and has a recording capacity that is about ten times as large as that of the CD. If such a DVD is used, a number of subtitles and a number of 4Q lyrics can be recorded on it, and it makes possible to allow the user to choose the subtitles or lyrics. That is, according to the DVD, it is possible to achieve the interactive selection and to give many choices to the user.
If audio information such as music etc. is recorded on the 45 DVD, the audio information whose amount is as large as the total amount of audio information recorded on several CDs can be recorded on it, since the DVD has a large amount of recording capacity. Hereinafter, a DVD on which audio information is mostly recorded is referred to as an "audio 50 DVD".
For example, if an audio DVD is produced with respect to one musician, all of the songs included in several CD albums produced by this musician can be recorded on this one audio DVD. Furthermore, it is possible to select several songs 55 from these CD albums on the basis of a certain theme and add them as a song collection album onto the same audio DVD.
More concretely, if an audio DVD is produced with respect to the Beatles, all of the songs included in several CD 60 albums produced by the Beatles can be recorded on this one audio DVD. Furthermore, it is possible to select several songs that the lead vocal is John Lennon from these CD albums and add them as "John Lennon Vocal Collection Album" onto the same audio DVD. 65
In this case, the same song is recorded doubly on one audio DVD. For example, the song, "Let It Be", is recorded
as a song included in the album whose title is "Let It Be", and this song is further recorded as a song included in the "John Lennon Vocal Collection Album".
It is useless to record the same song more than one time. That is, recording the audio information having same contents onto one DVD is in vain.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an information recording medium which can use its recording capacity efficiently by preventing to record audio information having the same content more than one time, and which can provide the user with the aforementioned interactive selection and many choices.
The above mentioned object can be achieved by an information recording medium in accordance with the present invention. The information recording medium has: a plurality of audio information which are independent of each other; and a plurality of reproducing control information to be used for reproducing the plurality of audio information. Each of the plurality of reproducing control information is assigned to any one of the plurality of audio information. The plurality of reproducing control information includes double reproducing control information. The double reproducing control information is assigned to one of the plurality of audio information to which different one of the plurality of reproducing control information has been assigned.
Thus, the double reproducing control information and another reproducing control information are doubly assigned to one audio information. If this audio information is reproduced according to the double reproducing control information and the reproducing control information, this audio information is doubly reproduced. Therefore, it is not needed to doubly record the same audio information on one information recording medium, and it is possible to record the audio information efficiently.
In the information recording medium may include a first information group having a set of the reproducing control information except the double reproducing control information, and a second information group having a set of the reproducing control information including the double reproducing control information. According to the information recording medium of the present invention, these information groups can be defined efficiently.
In the aforementioned information recording medium, the information recording medium may further have centralized reproducing control information which includes all of the plurality of reproducing control information. Therefore, all of the reproducing control information can be obtained by referring to the centralized reproducing control information, so that it is possible to make the reproducing process simple. As a result, the reproducing process can be carried out rapidly.
In the aforementioned information recording medium, each of the plurality of reproducing control information includes address information which indicates a recording position of one of the plurality of audio information. The double reproducing control information and the reproducing control information except the double reproducing control information include the same address information as each other. Therefore, by referring the address information of the audio information corresponding to each reproducing control information, the reproducing control information assigned to the doubled audio information can be found easily.
In the aforementioned information recording medium, the centralized reproducing control information may include