Compatible four channel recording and reproducing system

Details Compatible four channel recording and reproducing system Compatible four channel recording and reproducing system

1974-04-18

1976-02-24

Claffy, Kathleen H.

179 15BT, H04R 500

Patent

active

039405591

ABSTRACT:
A compatible four channel sound system for use in conjunction with a recording system for recording four individual audio signals designated L.sub.f, L.sub.b, R.sub.b and R.sub.f on a recording medium having first and second primary information channels and first and second subsidiary information channels, the first and second primary information channels carrying information that is consistent and compatible with existing monophonic and stereophonic standards. In accordance with the preferred embodiment of the invention, means are provided for forming a first composite signal designated L.sub.T which contains, to the extent they are present, L.sub.f in a dominant proportion and L.sub.b and R.sub.b in sub-dominant proportions, L.sub.b and R.sub.b being phase shifted with respect to each other. Means are also provided for forming a second composite signal designated R.sub.T which contains, to the extent they are present, R.sub.f in a dominant proportion and L.sub.b and R.sub.b in sub-dominant proportions, L.sub.b and R.sub.b being phase shifted with respect to each other. Further means are provided for forming a first auxiliary signal by combining all of the individual audio signals, L.sub.f, L.sub.b, R.sub.b and R.sub.f, to the extent they are present, and for forming a second auxiliary signal by combining all of these individual audio signals, L.sub.f, L.sub.b, R.sub.b and R.sub.f, to the extent they are present, the individual audio signals being combined in different relative phase relationships in the first and second auxiliary signals.

REFERENCES:
patent: 3761628 (1973-09-01), Bauer
patent: 3787629 (1974-01-01), Limberg
patent: 3814858 (1974-06-01), Parker
patent: 3824342 (1974-07-01), Christensen et al.
QFMX-Quadruplex FM Transmission using the 4-4-4 QMX Matrix System by Cooper Journal AES Mar., 1974, pp. 82-87.
Compatible FM Broadcasting of Panoramic Sound by Gibson et al., Journal AES Dec. 1972 pp. 816-822.

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