Data processing apparatus

• US 5,534,929 A
• Filed: 06/30/1994
• Issued: 07/09/1996
• Est. Priority Date: 07/06/1993
• Status: Expired due to Term

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Original Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Inventors: Tanaka, Mitsugu
• Primary Examiner(s): Britton, Howard W.
• Application Number:
  US08/269,361
• Time in Patent Office: 740 Days
• Field of Search: 348/405, 348/419, 348/423
• US Class Current: 375/240.03
• CPC Class Codes: H04N 19/107 between spatial and temporal predictive coding, e.g. picture refresh
• CPC Class Codes: H04N 19/124 Quantisation
• CPC Class Codes: H04N 19/13 Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
• CPC Class Codes: H04N 19/14 Coding unit complexity, e.g. amount of activity or edge presence estimation H04N19/146 takes precedence
• CPC Class Codes: H04N 19/146 Data rate or code amount at the encoder output
• CPC Class Codes: H04N 19/152 by measuring the fullness of the transmission buffer
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/61 in combination with predictive coding
• CPC Class Codes: H04N 19/91 Entropy coding, e.g. variable length coding [VLC] or arithmetic coding
• CPC Class Codes: H04N 21/236 Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream multiplexing of data packets for data networks, e.g. RTP/UDP H04L65/00
• CPC Class Codes: H04N 21/434 Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream demultiplexing of data packets for data networks, e.g. RTP/UDP H04L65/00

Abstract

A data processor in which input image data is coded by a coder, with the coded image data being stored in a memory. A controller controls a data amount of the coded image data which is output from the coder by comparing a predetermined set value and a data occupation ratio of the memory. The set value is changed in accordance with a transmission rate used when transmitting the coded image data. Audio data may be multiplexed with the output coded image data, with the timing of providing the audio data to the multiplexer being adjusted in accordance with the transmission rate.

Claims

1. A data processing apparatus comprising:

a) coding means for coding information data which is input;

b) memory means for storing the coded information data which was coded by said coding means;

c) control means for controlling a data amount of coded information data which is output from said coding means in accordance with a data occupation ratio of said memory means; and

d) change means for changing a real capacity of the memory means in accordance with a transmission rate when the coded information data is transmitted.

2. An apparatus according to claim 1, further including detecting means for detecting the transmission rate.

3. An apparatus according to claim 1, wherein the information data is image data.

4. An apparatus according to claim 3, wherein said coding means includes quantizing means for quantizing the information data, and said control means controls quantization steps of said quantizing means.

5. An apparatus according to claim 4, wherein said control means compares a predetermined set value and the data occupation ratio.

6. An apparatus according to claim 4, further including multiplexing means for multiplexing audio data to the coded image data.

7. An apparatus according to claim 6, wherein said multiplexing means multiplexes an audio signal for a vertical blanking period of the image data.

8. A data processing apparatus comprising:

a) coding means for coding information data which is input;

b) memory means for storing the coded information data which was coded by said coding means;

c) control means for controlling a data amount of coded information data which is output from said coding means in accordance with a data occupation ratio of said memory means, in which said control means controls the data amount by comparing a predetermined set value and the data occupation ratio; and

d) change means for changing the set value in accordance with a transmission rate when the coded information data is transmitted.

9. An apparatus according to claim 8, further including detecting means for detecting the transmission rate.

10. An apparatus according to claim 8, wherein the information data is image data.

11. An apparatus according to claim 10, wherein said coding means has quantizing means for quantizing the information data, and said control means controls quantization steps of said quantizing means.

12. An apparatus according to claim 11, further including multiplexing means for multiplexing audio data to the coded image data.

13. An apparatus according to claim 12, wherein the multiplexing means multiplexes an audio signal for a vertical blanking period of said image data.

14. A data processing apparatus comprising:

a) coding means for coding first information data which is input;

b) memory means for storing the coded first information data which was coded by said coding means;

c) control means for controlling a data amount of coded first information data which is output from said coding means in accordance with a data occupation ratio of said memory means;

d) multiplexing means for multiplexing second information data to the coded first information data which is output from said memory means; and

e) adjusting means for adjusting a timing for outputting the second information data to said multiplexing means in accordance with a transmission rate when transmitting the multiplexed data.

15. An apparatus according to claim 14, further including detecting means for detecting the transmission rate.

16. An apparatus according to claim 14, wherein including adjusting means has delay means for delaying the second information data and adjusting a delay time of said delay means.

17. An apparatus according to claim 14, wherein the first information data is image data and the second information data is audio data.

18. An apparatus according to claim 17, wherein said multiplexing means multiplexes an audio signal for a vertical blanking period of the image data.

19. An apparatus according to claim 14, wherein said coding means includes quantizing means for quantizing the first information data, and said control means controls quantization steps of said quantizing means.

20. An apparatus according to claim 19, wherein said control means controls the data amount by comparing a predetermined set value and the data occupation ratio.