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

• US 5,012,352 A
• Filed: 08/05/1988
• Issued: 04/30/1991
• 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: Nagasawa, Kenichi, Kashida, Motokazu, Shikakura, Akihiro, Yoshimura, Katsuji
• Primary Examiner(s): MCELHENY JR, DONALD E
• Application Number:
  US07/228,594
• Time in Patent Office: 998 Days
• Field of Search: 360/32, 360/19.1, 360/38.1, 358/335, 358/343
• US Class Current: 386/208
• CPC Class Codes: G11B 27/3027 used signal is digitally coded
• CPC Class Codes: G11B 27/3036 Time code signal
• CPC Class Codes: G11B 27/3063 Subcodes
• CPC Class Codes: H04N 5/78263 for recording on tracks inclined relative to the direction of movement of the tape
• CPC Class Codes: H04N 5/78266 using more than one track for the recording of one television field or frame, i.e. segmented recording
• 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-division multiplexing circuitry produces different data sequences for neighboring tracks.

Claims

1. A digital signal recording apparatus, comprising:

(a) first means for forming digital video data;

(b) second means for forming digital audio data;

(c) third means 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; and

(d) recording means for recording said video synchronizing blocks and said audio synchronizing blocks in tracks formed on a recording medium, said tracks being aligned in a direction of travel of said recording medium, said recording means including 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 for each of said tracks, said time-division multiplexing means producing different data sequences for neighboring tracks.

2. An apparatus according to claim 1, wherein the number of data of each of said video synchronizing blocks is the same as the number of data of each of said audio synchronizing blocks.

3. An apparatus according to claim 2, wherein said recording means produces data sequences in which audio synchronizing blocks are not adjacent each other within any data sequence.

4. An apparatus according to claim 1, wherein said time-division multiplexing means produces data sequences in which audio synchronizing blocks are not adjacent each other from one data sequence to the next.