Digital signal recording method and apparatus and digital signal reproduction method and apparatus
First Claim
1. A digital signal recording method for compressing and recording a digital signal onto a randomly accessible recording medium, said method comprising:
- a compression step for compressing a digital signal input with a compression ratio specified by a control signal from a plurality of compression ratios;
an accumulation step for accumulating the compressed digital signal in a memory; and
a recording step for recording the accumulated digital signal in a recording area of said recording medium.
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Accused Products
Abstract
The present invention enables to record and reproduce a digital signal in a high quality picture mode and in a long time mode with different compression rations on a single disc-shaped recording medium.
An output from a tuner 11 is supplied to a sound/data isolation circuit 12 where a video signal, an audio signal, and an accompanying data are isolated. The video signal is supplied via an A/D conversion circuit 14, a Y/C isolation circuit 15, a color demodulation circuit 16, a pre-filter 18, and a resampling circuit 19 to a compression circuit 20 where the video signal is compressed. The audio signal is supplied via an A/D conversion circuit 34, a pre-filter 38, and a resampling circuit 39 to a compression circuit 40 where the audio signal is compressed. Here, the compression ratio is switched by a control signal which specifies the high quality picture/long time mode. The compressed video signal, the compressed audio signal, and the accompanying data is combined into a serial data by a multiplex circuit 41 and via a FIFO memory 42 recorded on a disc-shaped recording medium 100. During a reproduction, the video signal and the audio signal are outputted according to the aforementioned procedure reversed.
53 Citations
19 Claims
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1. A digital signal recording method for compressing and recording a digital signal onto a randomly accessible recording medium, said method comprising:
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a compression step for compressing a digital signal input with a compression ratio specified by a control signal from a plurality of compression ratios; an accumulation step for accumulating the compressed digital signal in a memory; and a recording step for recording the accumulated digital signal in a recording area of said recording medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A digital signal recording apparatus comprising:
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compression means for compressing a digital signal with a compression ratio specified by a control signal from a plurality of compression ratios; a memory for accumulating the compressed digital signal; and recording means for recording the accumulated digital signal in a recording area specified according to said compression ratio from a plurality of recording areas on a recording medium. - View Dependent Claims (12, 13, 14)
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15. A digital signal reproduction method for reproducing a compressed digital signal recording on a randomly accessible recording medium, said method comprising:
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a read-out step for reading out a digital signal of a compression ratio which varies depending on recording areas of said recording medium; an accumulation step for accumulating the read-out digital signal in a memory; and a demodulation step for demodulating the accumulated digital signal. - View Dependent Claims (16)
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17. A digital signal reproduction apparatus comprising:
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read-out means for reading out digital signals recorded with different compression ratios in different recording areas of a randomly accessible recording medium; memory for accumulating the read-out digital signal; and decoding means for decoding the accumulated digital signal. - View Dependent Claims (18, 19)
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Specification