Title: Apparatus for reproducing a multichannel record disc

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.

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Inventors: Takahashi, Nobuaki (Yamato, JP)
Suzuki, Fujio (Yokohama, JP)
Kasuga, Masao (Sagamihara, JP)
Shibata, Norio (Sagamihara, JP)

Application Number: 843856
Filing Date: 1977-10-20
Publication_date: 1979-05-01
Assignee: Victor Company of Japan, Ltd. (Yokohama, JP)
Primary Class(es): 369/90 369/175, 381/2
Other Classes:
US Patent Ref:

2562703	Jul, 1951	Dome	179/15.
3219760	Nov, 1965	Loughlin	179/15.
3431361	Mar, 1969	Podell	179/15.
3624315	Nov, 1971	Broce	179/100.
3911232	Oct, 1975	Itoh	179/15.
3931482	Jan, 1976	Sugimoto	179/15.
3943303	Mar, 1976	Masuda	179/100.
3944755	Mar, 1976	Takahashi	179/100.

Other Refs:
Primary Examiner: Eddleman, Alfred H.
Assistant Examiner: Faber, Alan
Attorney: