Noise canceler for keying pulse in CATV converter
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United States of America Patent
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Mar 30, 1993
Grant Date -
N/A
app pub date -
Mar 27, 1991
filing date -
Mar 28, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A noise canceler for use in a CATV converter includes a keying pulse processing circuit for removing a noise signal from a keying signal. The keying pulse processing circuit includes a canceling signal generator for generating a noise canceling pulse signal, a delaying circuit for delaying the keying signal to produce a delayed signal, and a logic circuit including an AND gate for producing a noise canceled signal which is obtained by taking a logical product of the canceling pulse signal and the delayed signal. Since the noise pulse has a sufficiently small width when compared with the pulse widths of the keying signal and noise removing signal, the noise pulse is removed to obtain a noise canceled signal.
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