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EP0503859A2
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Digital signal recording method and apparatus
Assignee: Mitsubishi Electric Corp
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Filing: 1992-03-06
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Granted: —
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Expires: 2012-03-06
Abstract
Abstract A digital signal recording method wherein an error correction code is added to each of a digital video signal and a digital audio signal, and both the encoded data are recorded on a recording medium with the encoded audio data superimposed on the encoded video data or with part of the encoded video data is replaced by the encoded audio data. The region for superimposing recording or the region for replacing recording is variable accordingly to the number of channels of the digital audio signal. The error correcting capability for the video signal is substantially the same as that for the audio signal, and the redundancy in encoding is small. Audio signals of any number of channels can be recorded without changing the number of recording bits.
Inventors
- 👤 Ken c/o Denshi Shohin Kaihatsu Kenkyusho Onishi
- 👤 Kimitoshi c/o Kyoto Jigyosho Hongo
- 👤 Yukari Denshi Shohin Kaihatsu Kenkyusho Ono
- 👤 Kazuhiro Denshi Shohin Kaihatsu Sugiyama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 21:49
CPC Classifications
H; H04; H04N; H04N21/00; H04N21/20; H04N21/23; H04N21/236; G; G11; G11B; G11B20/00; G11B20/00007; G11B20/10; G11B20/12; G11B20/1201; G11B20/1207; G11B20/1208; G11B20/18; G11B20/1806; G11B20/1809; G11B20/1833; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B27/3027; H04N21/40; H04N21/43; H04N21/434; H04N9/00; H04N9/79; H04N9/80; H04N9/804; H04N9/8042; H04N9/8047; H04N9/806; H04N9/8063; H04N9/8066; H04N9/87; H04N9/88; H04N9/888
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
153 words
A digital signal recording method for recording a digital video signal and a digital audio signal on a recording medium, comprising the steps of: encoding the digital video signal to obtain encoded video data; encoding the digital audio signal to obtain encoded audio data; obtaining a video data error correction code for correcting an error caused by encoding the digital video signal; obtaining an audio data error correction code for correcting an error caused by encoding the digital audio signal; adding the video data error correction code to the encoded video data to obtain video data with correction code and recording the video data with correction code on the recording medium; and adding the audio data error correction code to the encoded audio data to obtain audio data with correction code and recording the audio data with correction code on the recording medium by superimposing it on the video data with correction code.
Claim 2
Dependent Claim
32 words
A digital signal recording method as defined in Claim 1, wherein data rate is compressed by using an orthogonal transform when the digital video signal and the digital audio signal are encoded.
Claim 3
Dependent Claim
196 words
A digital signal recording apparatus for inputting an analog video signal and an analog audio signal and recording video data arid audio data on a recording medium, comprising: means for converting the analog video signal into a digital video signal; means for converting the analog audio signal into a digital audio signal; first encoding means for encoding the digital video signal to obtain encoded video data; second encoding means for encoding the digital audio signal to obtain encoded audio data; means for obtaining a video data error correction code for correcting an error caused by encoding the digital video signal, and adding the video data error correction code to the encoded video data to obtain video data with correction code; means for obtaining an audio data error correction code for correcting an error caused by encoding the digital audio signal, and adding the audio data error correction code to the encoded audio data to obtain audio data with correction code; and means for recording the video data with correction code on the recording medium, and recording the audio data with correction code on the recording medium by superimposing it on the video data with correction code.
Claim 4
Dependent Claim
55 words
A digital signal recording apparatus as defined in Claim 3 or method according to Claim 1 or 2, wherein the recording region where the audio data with correction code is recorded with a superimposing relation to the video data with correction code is variable, depending on the number of channels of the digital audio signal.
Claim 5
Dependent Claim
122 words
A digital signal recording apparatus as defined in Claim 3, wherein said first encoding means comprises an orthogonal transformation circuit for dividing the digital video signal into blocks each having a plurality of pixels and performing an orthogonal transform on each block to obtain coefficients, a quantizing circuit for quantizing the coefficients and a variable-length encoding circuit for variable-length encoding an output of the quantizing circuit, and said second encoding means comprises an orthogonal transformation circuit for dividing the digital audio signal into blocks each having a plurality of pixels and performing an orthogonal transform on each block to obtain coefficients, a quantiting circuit for quantizing the coefficients and a variable-length encoding circuit for variable-length encoding an output of the quantizing circuit.
Claim 6
Dependent Claim
160 words
A digital signal recording method for recording a digital video signal and a digital audio signal on a recording medium, comprising the steps of: encoding the digital video signal to obtain encoded video data; encoding the digital audio signal to obtain encoded audio data; obtaining a video data error correction code for correcting an error caused by encoding the digital video signal; obtaining an audio data error correction code for correcting an error caused by encoding the digital audio signal; adding the video data error correction code to the encoded video data to obtain video data with correction code and recording the video data with correction code on the recording medium; and adding the audio data error correction code to the encoded audio data to obtain audio data with correction code and recording the audio data with correction code on the recording medium by replacing part of the video data with correction code with the audio data with correction code.
Claim 7
Dependent Claim
32 words
A digital signal recording method as defined in Claim 6, wherein data rate is compressed by using an orthogonal transform when the digital video signal and the digital audio signal are encoded.
Claim 8
Dependent Claim
203 words
A digital signal recording apparatus for inputting an analog video signal and an analog audio signal and recording video data and audio data on a recording medium, comprising: means for converting the analog video signal into a digital video signal; means for converting the analog audio signal into a digital audio signal; first encoding means for encoding the digital video signal to obtain encoded video data; second encoding means for encoding the digital audio signal to obtain encoded audio data; means for obtaining a video data error correction code for correcting an error caused by encoding the digital video signal, and adding the video data error correction code to the encoded video data to obtain video data with correction code; means for obtaining an audio data error correction code for correcting an error caused by encoding the digital audio signal, and adding the audio data error correction code to the encoded audio data to obtain audio data with correction code; and means for recording the video data with correction code on the recording medium, and recording the audio data with correction code on the recording medium by replacing part of the video data with correction code with the audio data with correction code.
Claim 9
Dependent Claim
57 words
A digital signal recording apparatus as defined in Claim 8 or method according to Claim 6 or 7, wherein the recording region where the audio data with correction code is recorded with a replacing relation to part of the video data with correction code is variable, depending on the number of channels of the digital audio signal.
Claim 10
Dependent Claim
122 words
A digital signal recording apparatus as defined in Claim 8, wherein said first encoding means comprises an orthogonal transformation circuit for dividing the digital video signal into blocks each having a plurality of pixels and performing an orthogonal transform on each block to obtain coefficients, a quantizing circuit for quantizing the coefficients and a variable-length encoding circuit for variable-length encoding an output of the quantizing circuit, and said second encoding means comprises an orthogonal transformation circuit for dividing the digital audio signal into blocks each having a plurality of pixels and performing an orthogonal transform on each block to obtain coefficients, a quantizing circuit for quantizing the coefficients and a variable-length encoding circuit for variable-length encoding an output of the quantizing circuit.
References Cited (Backward Citations)
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