Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1981-03-17
1983-06-14
Hecker, Stuart N.
Facsimile and static presentation processing
Facsimile
Recording apparatus
369 60, 369 88, H04N 576, H04B 164
Patent
active
043886540
ABSTRACT:
A video disc player designed to play video disc records having either non compressed monophonic wide band audio signals or video disc records having compressed stereophonic limited band audio signals recorded thereon. The player includes expander circuitry which may be selectively operated as a time invariant amplifier in the absence of stereo audio signals and as an amplifier with a time varying transfer function for expanding the stereo signals. The expander circuit operating mode is controlled by a circuit which detects the presence of a second or stereo sound carrier in the signal recovered from the record being played. Concurrently with the amplifier being rendered time invariant during the playback of monophonic records, electronic filter circuitry is switched into the amplifier circuitry to reduce the monophonic audio bandwidth and effectively increase the resultant audio signal-to-noise ratio.
REFERENCES:
patent: 2052110 (1936-08-01), Pfister
patent: 3631365 (1971-12-01), Dolby
patent: 3732371 (1973-05-01), Burwen
patent: 3969756 (1976-07-01), Palmer et al.
patent: 4220929 (1980-09-01), Talbot et al.
Hecker Stuart N.
Herrmann E. P.
McElheny Jr. Donald
RCA Corporation
Tripoli J. S.
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