VSB modulator symbol clock processing to reduce jitter/phase noise and sampling artifacts
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United States of America Patent
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Dec 27, 2005
Grant Date -
Aug 14, 2003
app pub date -
Oct 24, 2002
filing date -
Feb 13, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A translator demodulates a received digital television signal so as to produce a digital data stream, a symbol clock, and a byte clock, wherein the symbol clock and the byte clock are corrupted by phase noise. The digital data stream is written into a buffer in response to the corrupted byte clock. The corrupted symbol clock is applied to a frequency/phase locked loop having a narrowband loop filter. The frequency/phase locked loop produces a regenerated symbol clock having substantially no phase noise. The digital data stream is read from the buffer in response to the regenerated symbol clock. The digital data stream read from the buffer and the regenerated symbol clock are applied to a modulator for re-broadcasting of the received digital television signal.
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