Four channel stereophonic broadcasting system

Details Four channel stereophonic broadcasting system Four channel stereophonic broadcasting system

1972-12-01

1976-01-20

Claffy, Kathleen H.

H04H 500

Patent

active

039340929

ABSTRACT:
A broadcast system capable of transmitting and receiving a broadcast signal containing four discrete stereophonically related audio frequency inputs in which there is produced within the transmitter four matrix outputs, each of which is a function of one or more of the inputs. A main carrier wave is then frequency modulated with the first matrix output, with the sidebands of a suppressed first and second subcarrier which has been amplitude modulated with the second and third matrix outputs in quadrature relationship with each other, and with the lower sideband and a relatively small portion of the upper sideband of a depressed third subcarrier that has been amplitude modulated with the fourth matrix output. The modulation of the third subcarrier is limited to a maximum voltage level substantially below the highest level otherwise possible. The first, second, and third subcarriers are regenerated in the receiver and the four matrix outputs are detected. These outputs are then dematrixed to reproduce the four original inputs. The restricted sideband modulation associated with the third subcarrier and the amplitude limiting of its modulation signal maintain the out-of-band radiation of the transmitted energy within acceptable limits.

REFERENCES:
patent: 3083337 (1963-03-01), Grimes
patent: 3375444 (1968-03-01), Lomer
patent: 3549811 (1970-12-01), Borresen
patent: 3679832 (1972-07-01), Halpern
patent: 3708623 (1973-01-01), Dorren
Quart Ambience with Reference Tone by Gerzon Radio Electronics Dec. 1970.
System Delay Characteristics in NTSC Color Television by Palmer Proceedings IRE Jan. 1954.
Single Sideband Principles and Circuits by Pappenfus et al., McGraw-Hill Book Company copyright 1964 pp. 1-12.
Quadrasonics On The Air by Feldman Audio Magazine Jan. 1970.
The Quart Broadcasting System by Gerzon Audio Magazine Sept. 1970.

Affiliated with

Also associated with

Rating

Four channel stereophonic broadcasting system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Four channel stereophonic broadcasting system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Four channel stereophonic broadcasting system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1699415