Apparatus for delaying a sub-aural signal in a television receiv

Details Apparatus for delaying a sub-aural signal in a television receiv Apparatus for delaying a sub-aural signal in a television receiv

1989-04-28

1990-09-11

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358143, 381 2, H04N 560

Patent

active

049567128

ABSTRACT:
An apparatus for delaying a sub-aural (i.e., subchannel) signal in a television receiver of a sound multiplex system is provided, which is capable of outputting the sub-aural signal later than the main aural signal by a predetermined time interval. The apparatus is provided with a delaying circuit including an input clock generator, an output clock generator, an A/D converter for converting the output signal of a band-pass filter into a digital signal by setting down the input clock signal from the input clock signal generator at a sampling frequency, a memory for storing the output of the A/D converter, a D/A converter for converting the output signal of the memory into an analog signal by setting down the output clock signal from the output clock signal generator at a sampling frequency, and an output holding section for holding the output signal of the D/A converter by synchronizing the output signal of the D/A converter with the output signal from the output clock generator.

REFERENCES:
patent: 4449229 (1984-05-01), Mori
patent: 4461021 (1984-07-01), Schwartz et al.
patent: 4472830 (1984-09-01), Nagai
patent: 4486897 (1984-12-01), Nagai
patent: 4555730 (1985-11-01), Briggs
patent: 4652919 (1987-03-01), Devino
patent: 4656512 (1987-04-01), Devino
patent: 4803727 (1989-02-01), Holt et al.
patent: 4814874 (1989-03-01), Adachi

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