Multichannel record disc recording system with signal level cont

Details Multichannel record disc recording system with signal level cont Multichannel record disc recording system with signal level cont

1975-06-23

1977-04-05

Lucas, Jay P.

179 1G, G11B 300, H04H 500

Patent

active

040163741

ABSTRACT:
A multichannel record disc recording system comprises operation circuits for forming first and second sum signals and first and second difference signals respectively, from the signals of two pairs of channels, or a total of four channels. The first and second difference signals are angle modulated. When at least one of the first and second sum signals exceeds a predetermined level, a control signal is formed to control the levels of the first and second angle-modulated difference signals. The first sum signal and the first angle-modulated difference signal are level controlled and multiplexed. The second sum signal and the second angle-modulated difference signal are also level controlled and multiplexed thereby to produce multiplexed signals for recording on a record disc.

REFERENCES:
patent: 3772479 (1973-11-01), Hilbert
patent: 3806667 (1974-04-01), Ishigaki
patent: 3812295 (1974-05-01), Bauer
patent: 3895191 (1975-07-01), Koganezawa
patent: 3934087 (1976-01-01), Takahashi

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