| 摘要 |
A DC removal circuit for removing residual DC from a digitally encoded television signal including a plurality of multi level data symbols occurring at a constant symbol rate and formatted in repetitive data fields, each field including repetitive data segments having data segment sync of a fixed pattern of four symbols. A derived value of DC is subtracted from each of the received data symbols. The output of the subtractor is sampled, at the symbol rate or at one-half the symbol rate, and the sampled output is accumulated in an accumulator for generating the derived value. The sampling is continuous. The accumulator is preset to a zero value upon tuning to a different channel. An equalizer is supplied with the derived value of DC.
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