Digital signal recording apparatus time-division multiplexing video and audio signals

• US 5,101,274 A
• Filed: 01/24/1991
• Issued: 03/31/1992
• Est. Priority Date: 08/10/1987
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Shikakura, Akihiro, Nagasawa, Kenichi, Kashida, Motokazu, Yoshimura, Katsuji
• Primary Examiner(s): Groody, James J.
• Assistant Examiner(s): Harvey, David E.
• Application Number:
  US07/645,260
• Time in Patent Office: 432 Days
• Field of Search: 358/146, 358/142, 358/147, 358/143, 358/335, 358/343, 360/32, 360/19.1, 360/30.1
• US Class Current: 348/482
• CPC Class Codes: G11B 27/3036 Time code signal
• CPC Class Codes: G11B 27/3063 Subcodes
• CPC Class Codes: H04N 21/2368 Multiplexing of audio and video streams
• CPC Class Codes: H04N 21/4334 Recording operations recording of a television signal H04N5/76; arrangements for recording or accumulating broadcast information or broadcast-related information H04H60/27
• CPC Class Codes: H04N 21/4341 Demultiplexing of audio and video streams
• CPC Class Codes: H04N 5/78263 for recording on tracks inclined relative to the direction of movement of the tape
• CPC Class Codes: H04N 9/8042 involving data reduction
• CPC Class Codes: H04N 9/8063 using time division multiplex of the PCM audio and PCM video signals
• CPC Class Codes: H04N 9/8066 with insertion of the PCM audio signals in the vertical blanking interval of the PCM video signal
• CPC Class Codes: H04N 9/808 involving pulse code modulation of the composite colour video-signal
• CPC Class Codes: H04N 9/8081 involving data reduction
• CPC Class Codes: H04N 9/8088 with insertion of the PCM audio signals in the vertical blanking interval of the PCM video signal
• CPC Class Codes: H04N 9/8216 using time division multiplex
• CPC Class Codes: H04N 9/888 for signals recorded by pulse code modulation

Abstract

A digital signal recording apparatus includes first circuitry for forming digital video data, and second circuitry for forming digital audio data. Third circuitry is provided for forming (a) video synchronizing blocks each of which comprises a predetermined number of digital video data and synchronizing data, and (b) audio synchronizing blocks each of which comprises a predetermined number of digital audio data and synchronizing data. Recording circuitry is provided for recording the video synchronizing blocks and the audio synchronizing blocks in tracks formed on a recording medium, the tracks being generally aligned in the direction of travel in the recording medium. The recording circuitry includes time-division multiplexing circuitry for time-division multiplexing a predetermined number of video synchronizing blocks and a predetermined number of audio synchronizing blocks to produce a data sequence for each of the tracks. The time-divison multiplexing circuitry produces different data sequences for neighboring tracks.

Claims

1. A digital signal transmitting apparatus, comprising:

(a) first means for forming digital video data;

(b) second means for forming digital audio data;

(c) third means for forming (1) video synchronizing blocks each of which comprises synchronizing data at a block start and a predetermined number of digital video data, and (2) audio synchronizing blocks each of which comprises synchronizing data at a block start and a predetermined number of digital audio data, the number of data of each of the video synchronizing blocks being the same as the number of data of each of the audio synchronizing blocks, and the number of digital video data of each of the video synchronizing blocks being larger than the number of digital audio data of each of the video synchronizing blocks;

(d) time-division multiplexing means for time-division multiplexing a predetermined number of said video synchronizing blocks and a predetermined number of said audio synchronizing blocks to produce a data sequence; and

(e) transmitting means for transmitting said data sequence to a transmitting medium.

2. An apparatus according to claim 1, further comprising:

first error correction coding means for forming first error correction codes which include first error check data and the digital video data; and

second error correction coding means for forming second error correction codes which include second error check data and the digital audio data.

3. An apparatus according to claim 2, wherein the number of first error check data included in each of the video synchronizing blocks is smaller than the number of second error check data included in each of the audio synchronizing blocks.

4. An apparatus according to claim 3, wherein the sum of the number of the first error check data and the digital video data included in each of the video synchronizing blocks is the same as the sum of the number of the second error check data and the digital audio data included in each of the audio synchronizing blocks.

5. An apparatus according to claim 2, wherein each of the video synchronizing blocks includes a predetermined number of video data units each of which includes the first error check data at a unit end and the digital video data, and wherein each of the audio synchronizing blocks includes a predetermined number of audio data units each of which includes the second error check data at a unit end and the digital audio data.

6. An apparatus according to claim 5, wherein the number of the audio data units included in each of the audio synchronizing blocks is n times the number of the video data units included in each of the video synchronizing blocks, where n is an integer greater than or equal to 2.

7. An apparatus according to claim 5, wherein the number of data of each of the video data units is n times the number of data of each of the audio data units, where n is an integer greater than or equal to 2.

8. An apparatus according to claim 7, wherein the number of the first error check data included in each of video data units is the same as the number of the second error check data included in each of the audio data units.

9. A digital signal transmitting apparatus, comprising:

(a) first means for forming digital video data;

(b) second means for forming digital audio data;

(c) first error correction coding means for forming first error correction codes which include first error check data and the digital video data;

(d) second error correction coding means for forming second error correction codes which include second error check data and the digital audio data;

(e) third means for forming (1) video synchronizing blocks each of which includes synchronizing data at a block start and a predetermined number of video data units, and (2) audio synchronizing blocks each of which includes synchronizing data at a block start and a predetermined number of audio data units, each of the video data units including the first error check data at a unit end and the digital video data, each of the audio data units including the second error check data at a unit end and the digital audio data, the number of the audio data units included in each of the audio synchronizing blocks being n times the number of the video data units included in each of the video synchronizing blocks, when n is an integer greater than or equal to 2;

(f) time-division multiplexing means for time-division multiplexing a predetermined number of said video synchronizing blocks and a predetermined number of said audio synchronizing blocks to produce a data sequence; and

(g) transmitting means for transmitting said data sequence to a transmitting medium.

10. An apparatus according to claim 9, wherein the number of the first error check data included in each of the video data units is the same as the number of the second error check data included in each of the audio data units.

11. A digital signal transmitting apparatus, comprising:

(a) first means for forming digital video data;

(b) second means for forming digital audio data;

(c) first error correction coding means for forming first error correction code which include first error check data and the digital video data;

(d) second error correction coding means for forming second error correction codes which include second error check data and the digital audio data;

(e) third means for forming (1) video data units each of which includes the first error check data at a unit end and the digital video data, and (2) audio data units each of which includes the second error check data at a unit end and the digital audio data, the number of data of each of the video data units being n times the number of data of each of the audio data units, where n is the integer greater than or equal to 2;

(f) time-division multiplexing means for time-division multiplexing a predetermined number of said video data units and a predetermined number of said audio data units to produce a data sequence; and

(g) transmitting means for transmitting said data sequence to a transmitting medium.

12. A digital signal transmitting apparatus, comprising:

(a) first means for forming digital video data;

(b) second means for forming digital audio data;

(c) first error correction coding means for forming first error correction codes which include first error check data and the digital video data;

(d) second error correction coding means for forming second error correction codes which include second error check data and the digital audio data;

(e) third means for forming (1) video synchronizing blocks each of which includes synchronizing data at a block start, a predetermined number of the first error check data, and a predetermined number of the digital video data, and (2) audio synchronizing blocks each of which includes synchronizing data at a block start, a predetermined number of the second error check data, and a predetermined number of the digital audio data, the number of the first error check data included in each of the video synchronizing blocks being smaller than the number of the second error check data included in each of the audio synchronizing blocks;

(f) time-division multiplexing means for time-division multiplexing a predetermined number of said video synchronizing blocks and a predetermined number of said audio synchronizing blocks to produce a data sequence; and

(g) transmitting means for transmitting said data sequence to a transmitting medium.

13. An apparatus according to claim 12, wherein the number of data of each of the video synchronizing blocks is the same as the number of data of each of the audio synchronizing blocks.