Sound channel circuit for digital television receivers
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United States of America Patent
Stats
-
Apr 13, 1993
Grant Date -
N/A
app pub date -
Sep 11, 1989
filing date -
Nov 6, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A circuit capable of handling all television sound transmission standards, including the 'NICAM' standard. The circuit contains an analog antialiasing low-pass filter which is fed by the analog sound and video signal and followed by an analog-to-digital converter. The output of the latter is freed from the video signal by a filter circuit. The digital sound signal is applied to a phase splitter having a 0.degree. output and a 90.degree. output which are connected to a phase discriminator. An absolute-value output of the phase discriminator provides the amplitude-demodulated sound signal, while a phase-angle output feeds the DQPSK portion of a 'NICAM' decoder and a differentiating stage, which delivers the frequency-modulated sound signal.
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Family
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Cited Art Landscape
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