Audio signal demodulation circuit

Details Audio signal demodulation circuit Audio signal demodulation circuit

1993-12-10

1994-11-08

Atkinson, Charles E.

Excavating

348571, H04N 576, G06F 1100

Patent

active

053633849

ABSTRACT:
A digital audio signal demodulation circuit comprises a synchronous detection circuit (18) and a muting circuit (17) for muting the output from an interpolation circuit (16) using a synchronization lock signal generated from the synchronous detection circuit (18) when synchronization has been lost. The differential signal output from the interpolation circuit (16) is muted by the muting circuit (17) and thereafter integrated by an integration circuit (19). Thus, an audio signal with high sound quality can be demodulated without producing interruption noise even when synchronization has been lost or forcible muting is done.

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Kaoru Watanabe et al, "NI-DPCM Coding of HDTV Sound Signal for Baseband Multiplexing," NHK Science and Technical Research Laboratories, Mar. 1962, p. 1384.
Yuichi Ninomiya et al, "A Single Channel Transmission System for HD-TV Satellite Broadcasting," NHK Science and Technical Research Laboratories, vol. J68, No. 4, (1985), pp. 647-654.

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