Apparatus for reproducing a multichannel record disc

Details Apparatus for reproducing a multichannel record disc Apparatus for reproducing a multichannel record disc

1977-10-20

1979-05-01

Eddleman, Alfred H.

1791001TD, 179 1GQ, 179 1GB, G11B 374, H03D 300

Patent

active

041525507

ABSTRACT:
A multichannel record disc reproducing apparatus has a pickup cartridge for picking up signals from a multichannel record disc. A multiplexed signal was recorded on the disc by first multiplexing direct wave signals and angle-modulated wave signals which are recorded on opposite groove walls. Filters separate the picked up multiplexed signal into the direct wave signal and the angle-modulated wave signal. A demodulates circuit for demodulating the angle-modulated wave signal, thus separated. A matrix circuit separates the signals to obtain a plurality of separate channels from the direct wave signals and the demodulated signals. A circuit in a stage preceding the demodulator removes substantially all components of the higher harmonics at the carrier wave center frequency, which carrier was used for angle-modulating the original signal.

REFERENCES:
patent: 2562703 (1951-07-01), Dome
patent: 3219760 (1965-11-01), Loughlin
patent: 3431361 (1969-03-01), Podell
patent: 3624315 (1971-11-01), Broce
patent: 3911232 (1975-10-01), Itoh
patent: 3931482 (1976-01-01), Sugimoto
patent: 3943303 (1976-03-01), Masuda
patent: 3944755 (1976-03-01), Takahashi

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