CA2691762A1 - Method and apparatus for an adaptive de-jitter buffer - Google Patents
Method and apparatus for an adaptive de-jitter buffer Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
- H04L47/2416—Real-time traffic
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/28—Flow control; Congestion control in relation to timing considerations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/90—Buffering arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/75—Media network packet handling
- H04L65/752—Media network packet handling adapting media to network capabilities
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/005—Correction of errors induced by the transmission channel, if related to the coding algorithm
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/062—Synchronisation of signals having the same nominal but fluctuating bit rates, e.g. using buffers
- H04J3/0632—Synchronisation of packets and cells, e.g. transmission of voice via a packet network, circuit emulation service [CES]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/29—Flow control; Congestion control using a combination of thresholds
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/30—Flow control; Congestion control in combination with information about buffer occupancy at either end or at transit nodes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/90—Buffering arrangements
- H04L49/9084—Reactions to storage capacity overflow
- H04L49/9089—Reactions to storage capacity overflow replacing packets in a storage arrangement, e.g. pushout
- H04L49/9094—Arrangements for simultaneous transmit and receive, e.g. simultaneous reading/writing from/to the storage element
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
- H04L65/1101—Session protocols
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/80—Responding to QoS
Abstract
Adaptive De-Jitter Buffer for Voice over IP (VoIP) for packet switch communications. The de-jitter buffer methods and apparatus presented avoid playback of underflows while balancing end-to-end delay. In one example, the de-jitter buffer is recalculated at the beginning of each talkspurt. In another example, talkspurt packets are compressed upon receipt of all remaining packets.
Claims (34)
1. An apparatus, comprising:
a memory storage unit configured to store packets of data; and a first controller configured to compare a number of packets stored in the memory storage unit to a first compression time warp threshold and a first expansion time warp threshold for the memory storage unit, the first controller further adapted to generate a time warp control signal indicating compression if the number of stored packets exceeds the first compression time warp threshold and to generate a time warp control signal indicating expansion if the number of stored packets exceeds the first expansion time warp threshold.
a memory storage unit configured to store packets of data; and a first controller configured to compare a number of packets stored in the memory storage unit to a first compression time warp threshold and a first expansion time warp threshold for the memory storage unit, the first controller further adapted to generate a time warp control signal indicating compression if the number of stored packets exceeds the first compression time warp threshold and to generate a time warp control signal indicating expansion if the number of stored packets exceeds the first expansion time warp threshold.
2. The apparatus as in claim 1, wherein the first controller further adapted to compare the number of packets stored to a set of compression time warp thresholds and a set of expansion time warp thresholds, wherein each of the set of compression time warp thresholds and each of the set of expansion time warp thresholds correspond to unique percentages of a target delay length for the memory storage unit.
3. The apparatus as in claim 1, wherein the first controller is further configured to generate the time warp control signal for expansion if a next sequential packet is received after an anticipated playback time for the next sequential packet.
4. The apparatus as in claim 3, wherein the first controller is further configured to average a status of the memory storage unit over a time window before comparing the number of stored packets to time warp thresholds.
5. The apparatus as in claim 4, wherein the first controller is further configured to filter the number of packets stored in the memory storage unit over a time window.
6. The apparatus as in claim 5, wherein the first controller is further configured to determine a target delay length, and determine the time window as a function of the target delay length.
7. The apparatus as in claim 6, wherein the first controller is further configured to determine the target delay length as a target number of packets to be stored in the memory storage unit.
8. The apparatus as in claim 4, wherein the first controller is further configured to compare an average number of packets stored in the memory storage unit to time warp thresholds.
9. The apparatus as in claim 1, wherein the first controller is further configured to generate the time warp control signal is a multi-state control signal.
10. The apparatus as in claim 9, wherein the first controller is further configured to determine a target delay length for the memory storage unit, wherein the memory storage unit is an adaptive de-jitter buffer, and wherein the target delay length is a target de-jitter buffer delay.
11. An apparatus, comprising:
a memory storage unit configured to store packets of data; and a first controller adapted to determine a target delay length for the memory storage unit, and to initiate compression of at least one packet when a number of stored packets exceeds the target delay length.
a memory storage unit configured to store packets of data; and a first controller adapted to determine a target delay length for the memory storage unit, and to initiate compression of at least one packet when a number of stored packets exceeds the target delay length.
12. The apparatus as in claim 11, wherein the first controller is further configured to maintain a given percentage of underflows due to delayed packets.
13. The apparatus as in claim 12, wherein the first controller is further configured to calculate the target delay length as:
If (PER delay < TARGET_VALUE) then DEJITTER_DELAY = DEJITTER_DELAY -CONSTANT;
If (PER delay > TARGET_VALUE && PER delay >= last_PER delay) then DEJITTER_DELAY = DEJITTER_DELAY +
CONSTANT;
Set DEJITTER_DELAY = MAX (MIN_JITTER, DEJITTER_DELAY);
and DEJITTER_DELAY = MIN (MAX_JITTER, DEJITTER_DELAY), wherein PER delay is a rate of underflows due to delayed packets, TARGET_VALUE is a targeted rate of delayed packets, DEJITTER_DELAY is the target delay length of the adaptive de-jitter buffer, CONSTANT is a pre-defined value, and MAX_JITTER and MIN_JITTER are pre-defined values representing the maximum and minimum target delay lengths respectively.
If (PER delay < TARGET_VALUE) then DEJITTER_DELAY = DEJITTER_DELAY -CONSTANT;
If (PER delay > TARGET_VALUE && PER delay >= last_PER delay) then DEJITTER_DELAY = DEJITTER_DELAY +
CONSTANT;
Set DEJITTER_DELAY = MAX (MIN_JITTER, DEJITTER_DELAY);
and DEJITTER_DELAY = MIN (MAX_JITTER, DEJITTER_DELAY), wherein PER delay is a rate of underflows due to delayed packets, TARGET_VALUE is a targeted rate of delayed packets, DEJITTER_DELAY is the target delay length of the adaptive de-jitter buffer, CONSTANT is a pre-defined value, and MAX_JITTER and MIN_JITTER are pre-defined values representing the maximum and minimum target delay lengths respectively.
14. The apparatus as in 13, wherein the first controller is configured to calculate the PER delay as:
PER delay = PER_CONSTANT × PER delay + (1-PER_CONSTANT) ×
Current_PER delay wherein PER_CONSTANT is the time constant for the filter used to estimate PER delay.
PER delay = PER_CONSTANT × PER delay + (1-PER_CONSTANT) ×
Current_PER delay wherein PER_CONSTANT is the time constant for the filter used to estimate PER delay.
15. The apparatus as in claim 14, wherein the first controller comprises:
a packet error calculation unit configured to calculate the Current_PER delay as a rate of delayed packets, wherein delayed packets are received after an anticipated playback time, and wherein the Current PER
delay.
a packet error calculation unit configured to calculate the Current_PER delay as a rate of delayed packets, wherein delayed packets are received after an anticipated playback time, and wherein the Current PER
delay.
16. The apparatus as in claim 15, wherein the packet error calculation unit is configured to calculate the Current PER delay as a ratio of delayed packets to total packets received, including delayed packets, measured from a last update of PER delay to a current update, and calculated as:
17. The apparatus as in claim 16, wherein the first controller is configured to identify a first portion of received packets, wherein the first portion corresponds to a talkspurt, and wherein the talkspurt comprises a plurality of sequential packets.
18. The apparatus as in claim 17, wherein the first controller is configured to identify the first portion by encoding of the first portion.
19. The apparatus as in claim 18, wherein the first controller is configured to determine an anticipated playback time for a first packet of the talkspurt, and to initiate playback of the first packet of the talkspurt before the anticipated playback time.
20. The apparatus as in claim 19, the first controller further configured to initiate expansion of subsequent packets after playback of the first packet.
21. The apparatus as in claim 20, wherein the first controller is configured to identify the beginning and the end of a talkspurt.
22. The apparatus as in claim 21, wherein the first controller is configured to identify an end portion of the talkspurt, and compress at least one packet in the end portion of the talkspurt.
23. The apparatus as in claim 22, wherein the first controller is configured to identify the end portion of the talkspurt by an encoding rate of received packets.
24. The apparatus as in claim 23, wherein the first controller is configured to identify the end portion of the talkspurt by a silence indicator.
25. The apparatus as in claim 24, wherein the first controller is configured to identify the end portion of the talkspurt by an end-of-talkspurt indicator.
26. A method for processing packetized data, comprising:
storing packets of data in a memory storage unit;
determining a target delay length for the memory storage unit;
evaluating a status of the memory storage unit with respect to the target delay length, wherein the status of the memory storage unit is a measure of data stored in the memory storage unit; and initiating time warping of at least one packet from the memory storage unit if the status of the memory storage violates the target delay length.
storing packets of data in a memory storage unit;
determining a target delay length for the memory storage unit;
evaluating a status of the memory storage unit with respect to the target delay length, wherein the status of the memory storage unit is a measure of data stored in the memory storage unit; and initiating time warping of at least one packet from the memory storage unit if the status of the memory storage violates the target delay length.
27. The method of claim 26, further comprising:
calculating the target delay length as:
If (PER delay < TARGET_VALUE) then DEJITTER_DELAY = DEJITTER_DELAY -CONSTANT;
If (PER delay > TARGET_VALUE && PER delay >= last_ PER delay) then DEJITTER_DELAY = DEJITTER_DELAY +
CONSTANT;
Set DEJITTER_DELAY = MAX (MIN_JITTER, DEJITTER_DELAY);
and DEJITTER_DELAY = MIN (MAX_JITTER, DEJITTER_DELAY), wherein PER delay is a rate of underflows due to delayed packets, the TARGET_VALUE is a targeted rate of delayed packets, the DEJITTER_DELAY is the target delay length of the adaptive de-jitter buffer, the CONSTANT is a pre-defined value, and the MAX_JITTER and MIN_JITTER are pre-defined values which are the maximum and minimum target delay lengths respectively.
calculating the target delay length as:
If (PER delay < TARGET_VALUE) then DEJITTER_DELAY = DEJITTER_DELAY -CONSTANT;
If (PER delay > TARGET_VALUE && PER delay >= last_ PER delay) then DEJITTER_DELAY = DEJITTER_DELAY +
CONSTANT;
Set DEJITTER_DELAY = MAX (MIN_JITTER, DEJITTER_DELAY);
and DEJITTER_DELAY = MIN (MAX_JITTER, DEJITTER_DELAY), wherein PER delay is a rate of underflows due to delayed packets, the TARGET_VALUE is a targeted rate of delayed packets, the DEJITTER_DELAY is the target delay length of the adaptive de-jitter buffer, the CONSTANT is a pre-defined value, and the MAX_JITTER and MIN_JITTER are pre-defined values which are the maximum and minimum target delay lengths respectively.
28. The method as in claim 27, further comprising:
generating a time warp control signal;
receiving a plurality of sequential packets; and add-overlapping segments in response to the time warp control signal.
generating a time warp control signal;
receiving a plurality of sequential packets; and add-overlapping segments in response to the time warp control signal.
29. The method as in claim 28, wherein the add-overlapping comprises:
combining at least two of the plurality of segments as:
i = 0..WindowSize-1 Windowsize = RWindowSize wherein OutSegment is a resulting add-overlapped segment, Segment1 and Segment2 are the segments to be add-overlapped, WindowSize corresponds to a first segment, and RWindowSize corresponds to a second segment.
combining at least two of the plurality of segments as:
i = 0..WindowSize-1 Windowsize = RWindowSize wherein OutSegment is a resulting add-overlapped segment, Segment1 and Segment2 are the segments to be add-overlapped, WindowSize corresponds to a first segment, and RWindowSize corresponds to a second segment.
30. The method of claim 29, wherein the add-overlapping further comprises:
identifying a portion of maximum correlation between the first segment and the second segment.
identifying a portion of maximum correlation between the first segment and the second segment.
31. The method of claim 30, wherein identifying the portion of maximum correlation between the first segment and the second segment further comprises:
identifying the portion of maximum correlation by calculating maximum correlation as:
wherein x represents the first segment, y represents the second segment of speech, m represents the correlation window, i is an index value, and d represents the correlation portion.
identifying the portion of maximum correlation by calculating maximum correlation as:
wherein x represents the first segment, y represents the second segment of speech, m represents the correlation window, i is an index value, and d represents the correlation portion.
32. The method as in claim 26, further comprising:
time warping a plurality of sequential packets;
inhibiting time warping for at least one sequential packet, wherein the at least one sequential packet is subsequent to the plurality of sequential packets; and enabling time warping subsequent to the at least one sequential packet.
time warping a plurality of sequential packets;
inhibiting time warping for at least one sequential packet, wherein the at least one sequential packet is subsequent to the plurality of sequential packets; and enabling time warping subsequent to the at least one sequential packet.
33. The method as in claim 26, further comprising:
calculating a time warping rate, wherein the time warping rate is a number of time warped packets over a time window; and initiating time warping of packets as a function of the time warping rate.
calculating a time warping rate, wherein the time warping rate is a number of time warped packets over a time window; and initiating time warping of packets as a function of the time warping rate.
34. A computer-readable storage medium containing a set of instructions, the set of instructions comprising:
an input routine for storing packets of data in a memory storage unit;
a target delay length calculation routine for determining a target delay length for the memory storage unit;
a first routine for evaluating a status of the memory storage unit with respect to the target delay length, wherein the status of the memory storage unit is a measure of data stored in the memory storage unit; and a second routine initiating time warping of at least one packet from the memory storage unit if the status of the memory storage violates the target delay length.
an input routine for storing packets of data in a memory storage unit;
a target delay length calculation routine for determining a target delay length for the memory storage unit;
a first routine for evaluating a status of the memory storage unit with respect to the target delay length, wherein the status of the memory storage unit is a measure of data stored in the memory storage unit; and a second routine initiating time warping of at least one packet from the memory storage unit if the status of the memory storage violates the target delay length.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US60603604P | 2004-08-30 | 2004-08-30 | |
US60/606,036 | 2004-08-30 | ||
CA2578737A CA2578737C (en) | 2004-08-30 | 2005-08-30 | Method and apparatus for an adaptive de-jitter buffer |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CA2578737A Division CA2578737C (en) | 2004-08-30 | 2005-08-30 | Method and apparatus for an adaptive de-jitter buffer |
Publications (2)
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CA2691762A1 true CA2691762A1 (en) | 2006-03-09 |
CA2691762C CA2691762C (en) | 2012-04-03 |
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CA2578737A Active CA2578737C (en) | 2004-08-30 | 2005-08-30 | Method and apparatus for an adaptive de-jitter buffer |
CA2691959A Active CA2691959C (en) | 2004-08-30 | 2005-08-30 | Method and apparatus for an adaptive de-jitter buffer |
CA2691762A Active CA2691762C (en) | 2004-08-30 | 2005-08-30 | Method and apparatus for an adaptive de-jitter buffer |
CA2691589A Abandoned CA2691589A1 (en) | 2004-08-30 | 2005-08-30 | Method and apparatus for an adaptive de-jitter buffer |
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CA2578737A Active CA2578737C (en) | 2004-08-30 | 2005-08-30 | Method and apparatus for an adaptive de-jitter buffer |
CA2691959A Active CA2691959C (en) | 2004-08-30 | 2005-08-30 | Method and apparatus for an adaptive de-jitter buffer |
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CA2691589A Abandoned CA2691589A1 (en) | 2004-08-30 | 2005-08-30 | Method and apparatus for an adaptive de-jitter buffer |
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EP (4) | EP1787290B1 (en) |
JP (4) | JP2008512062A (en) |
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CN (5) | CN102779517A (en) |
AT (1) | ATE488838T1 (en) |
BR (1) | BRPI0514801B1 (en) |
CA (4) | CA2578737C (en) |
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