SYSTEM, METHOD, AND APPARATUS FOR JITTER REDUCTION IN A VIDEO DECODER SYSTEM

• US 20070086344A1
• Filed: 10/18/2006
• Published: 04/19/2007
• Est. Priority Date: 10/18/2005
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Inventors: MacInnis, Alexander
• Granted Patent: US 9,692,537 B2
• Time in Patent Office: Days
• US Class Current: 370/235
• CPC Class Codes: H04J 3/0632 Synchronisation of packets and cells, e.g. transmission of voice via a packet network, circuit emulation service [CES] queuing arrangements in packet switching elements H04L49/90; synchronising systems for the synchronous transmission of a pulse code modulated video signal with one or more other pulse code modulated signals H04N7/56
• CPC Class Codes: H04N 21/2368 Multiplexing of audio and video streams
• CPC Class Codes: H04N 21/4305 Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR packets arrangements for synchronising receiver with transmitter by comparing receiver clock with transmitter clock H04L7/0012; arrangements for synchronising receiver with transmitter wherein the receiver takes measures against momentary loss of synchronisation H04L7/0083
• CPC Class Codes: H04N 21/4341 Demultiplexing of audio and video streams

Abstract

In one embodiment, there is presented a method for processing data. The method comprises receiving a bitstream, said bitstream comprising a first data stream and a second data stream, wherein the first data stream comprises data that is intended to be consumed at a substantially constant bit rate; and controlling the processing rate of the second data stream based at least in part on the rate of receipt of the first data stream.

Claims

1. A method for processing data, said method comprising:

receiving a bitstream, said bitstream comprising a first data stream and a second data stream, wherein the first data stream comprises data that is intended to be consumed at a substantially constant bit rate; and

controlling the processing rate of the second data stream based at least in part on the rate of receipt of the first data stream.

2. The method of claim 1, further comprising:

storing the first data stream in a buffer; and

wherein controlling the processing rate of the second data stream further comprises controlling the processing rate of the second stream based on the amount of data from the first stream in the buffer.

3. The method of claim 1, further comprising:

processing a given amount of data from the first data stream in a certain time period; and

processing the portion of data from the second data stream that is commingled with the first amount of the data from the first bitstream in the certain time period.

4. The method of claim 1, wherein the bitstream includes time stamps, said method further comprising:

adjusting a system time clock based at least in part on a comparison of the system time clock and the time stamps.

8. The method of claim 1, wherein the bitstream includes time stamps, said method further comprising:

adjusting a system time clock based at least in part on a comparison of the system time clock and the time stamps.

5. A method for processing data, said method comprising:

receiving a bitstream, said bitstream comprising an audio stream and a video stream, wherein the audio stream comprises data that is intended to be consumed at a substantially constant bit rate and the video stream comprises data that is intended to be consumed at a varying bit rate; and

controlling the processing rate of the video stream based at least in part on the rate of receipt of the audio stream.

6. The method of claim 5, further comprising:

storing the audio stream in a buffer; and

wherein controlling the processing rate of the video stream further comprises controlling the processing rate of the video stream based on the amount of data from the audio stream in the buffer.

7. The method of claim 5, further comprising:

processing a given amount of the audio stream in a certain time period;

processing the portion of the video stream that is commingled with the amount of the audio stream in the certain time period.

9. A circuit for providing data from a bitstream, said circuit comprising:

a first circuit for reducing jitter in the bitstream due to variable delay in the delivery of the bitstream, thereby resulting in the bitstream with another delivery schedule; and

a second circuit for recovering a time base of the bitstream, based at least in part on time stamps in the bitstream with the another delivery schedule.

10. The circuit of claim 9, wherein the bitstream comprises a first data stream with data that is intended to be consumed at a substantially constant bit rate and a second data stream, and wherein the first circuit controls the delivery of the second data stream based at least in part on the rate of receipt of the first data stream.

11. The circuit of claim 9, wherein the first circuit comprises:

a buffer for storing the first data stream; and

wherein controlling the processing rate of the second stream further comprises controlling the delivery of the second stream based on the amount of data from the first data stream in the buffer.

12. The circuit of claim 10, wherein the first circuit delivers a given amount of the first data bitstream in a certain time period and a portion of the second data bitstream that is commingled with the given amount of the first data bitstream in the certain time period.

13. The circuit of claim 9, wherein the bitstream includes time stamps, said circuit further comprising:

a system time clock for providing a time base; and

a comparator for comparing the system time clock and the time stamps, wherein the comparator adjusts the system time clock based at least in part on a comparison of the system time clock and the time stamps.

14. The circuit of claim 9, wherein the bitstream comprises an audio stream with data that is intended to be consumed at a substantially constant bit rate and a video stream with data that is intended to be consumed at a variable bit rate, and wherein the first circuit controls the delivery of the video stream based at least in part on the rate of receipt of the audio stream.

15. The circuit of claim 14, wherein the first circuit comprises:

a buffer for storing the audio stream; and

wherein controlling the processing rate of the video stream further comprises controlling the delivery of the video stream based on the amount of data from the audio stream in the buffer.

16. The circuit of claim 14, wherein the first circuit delivers a given amount of the audio stream in a certain time period and a portion of the video stream that is commingled with the given amount of the audio stream in the certain time period.

17. The circuit of claim 14, wherein the bitstream includes time stamps, said circuit further comprising:

a system time clock for providing a time base; and

a comparator for comparing the system time clock and the time stamps, wherein the comparator adjusts the system time clock based at least in part on a comparison of the system time clock and the time stamps; and

wherein the second circuit adjusts the system time clock based on the comparison by the comparator.