Four-channel stereophonic reproducing system for reproducing dis

Details Four-channel stereophonic reproducing system for reproducing dis Four-channel stereophonic reproducing system for reproducing dis

1974-04-24

1976-01-06

Fears, Terrell W.

Fire extinguishers

Special applications

Condition responsive control

179 1GQ, 179 15BT, 1691001TD, G11B 374, H04B 500

Patent

active

039314820

ABSTRACT:
In a four-channel stereophonic reproducing system of the type in which a first, second, third and fourth audio signals are reproduced from two stereophonic composite signals which are respectively comprised of a left side signal consisting of a main channel signal composed of the sum of the first and second audio signals and a sub-channel signal obtained by frequency modulating or phase modulating the difference between the first and second audio signals, and a right side signal consisting of a main channel signal composed of the sum of the third and fourth audio signals and a sub-channel signal obtained by frequency modulating or phase modulating the difference between the third and fourth audio signals, a detector circuit for detecting each sub-channel signal is followed by a filter circuit for eliminating undesired higher frequencies whereby to eliminate higher audio frequencies including increased noise components to improve the S/N ratio, and at the same time a phase correction circuit is provided in the reproducing section for each main channel signal to correct for any phase distortion due to the filter circuit whereby to ensure a greatly improved separation.

REFERENCES:
patent: 3564434 (1971-02-01), Camenzind et al.
patent: 3686471 (1972-08-01), Takahashi
patent: 3803367 (1974-04-01), Takahashi
patent: 3825697 (1974-07-01), Cornell et al.
Further Improvements in the Discrete Four Channel Disc System CD-4 by Owaki et al., Vol. 20, No. 5 J.A.E.S. located 179/100.1 TD.

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