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Methods and apparatuses for implementing selective interference-filter pre-coding of main-service 8-VSB DTV signals
Methods and apparatuses for implementing selective interference-filter pre-coding of main-service 8-VSB DTV signals
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机译：用于实现主业务8-VSB DTV信号的选择性干扰滤波器预编码的方法和装置
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摘要
Methods for discontinuing interference-filter pre-coding of 8-VSB digital television (DTV) signals during ancillary-service transmissions are disclosed that do not disrupt reception of main-service DTV signals by receivers already in use. Receivers are disclosed for receiving ancillary-service transmissions without interference-filter pre-coding, which receivers include adaptive channel-equalization filters and subsequent decoders for CCC. The subsequent decoders for CCC respond to data slicing of adaptive channel-equalization filter responses that avoid the reduction of signal-to-noise ratio (SNR) caused by post-comb filtering. Certain of these M/H receivers employ selective post-comb-filtering to flatten the frequency spectrum of main-service components of received 8-VSB DTV signals, while leaving the frequency spectrum of M/H-service components of received 8-VSB DTV signals as received. This is done to generate signal from which filter coefficients for the channel-equalization filters are determined. Certain of these M/H receivers employ decision-feedback equalization (DFE) techniques, which techniques are unaffected by selective interference-filter pre-coding.
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