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公开(公告)号：EP0055540A1
公开(公告)日：1982-07-07
申请号：EP81305816.1
申请日：1981-12-09
申请人： CBS INC
IPC分类号： H04N9/02
CPC分类号： H04N11/04
摘要： Method and apparatus for detecting and significantly correcting bit errors in a pulse code modulated video signal (10) which recognizes the unique spectral characteristics of isolated bit errors in a digital bit stream, which errors generate spectral energy outside the frequency band of the PCM video signal, and utilizes that energy to detect and correct errors without the use of overhead bits. The timing and the amplitude of any energy burst at F s / 2 indicates the location and significance of any one of the four most significant bits in a word of the video signal which is in error, where F s is the PCM sampling frequency.
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42.发明公开Methods of and arrangements for decoding and recoding composite digital television signals 失效方法和装置，用于解码复合并返回编码数字电视信号。
公开(公告)号：EP0033607A2
公开(公告)日：1981-08-12
申请号：EP81300245.8
申请日：1981-01-20
申请人： SONY CORPORATION
CPC分类号： H04N11/16 , H04N9/8042 , H04N11/04
摘要： A decoder-recoder arrangement (1) for decoding a composite digital television signal for recording on a digital video recorder (8) and for subsequently recoding the reproduced signal, the arrangement comprising a decoder (6) including filters (11, 15 and 16) for separating two chrominance components from the composite digital television signal, demodulators (17 and 18) for demodulating the chrominance components, sample rate reducers (19 and 24) for reducing the sample rates of the demodulated chrominance components, interpolators (21 and 26) for interpolating samples into the sample-reduced demodulated chrominance components to restore the sample rate to the original value,modulators (22 and 27) for remodulating the interpolated chrominance components an adder (23) for adding together the modulated interpolated chrominance components, and a subtractor (13) for subtracting the output of the adder (23) from the input composite digital television signal; and a recoder (7) including interpolators (32 and 35) for interpolating samples into said sample-reduced demodulated chrominance components to restore the sample rate to the original sample value, modulators (33 and 36) for modulating the interpolated chrominance components obtained from the interpolators (32 and 35), an adder (34) for adding together the outputs of the modulators (33 and 36), and an adder (30) for adding the output of the adder (34) to the output of the subtractor (13) to derive the original composite digital television signal.
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