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Improving the Signal-to-Noise Ratio and Coverage of FM Stereophonic Broadcasts

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It is a well-known phenomenon that the presently authorized system for FM stereophonic radio broadcasting imposes a significant degradation of the received signal-to-noise ratio when such broadcasts are compared with monophonic transmission. As a consequence, the station coverage area is reduced for both monophonic and stereophonic reception. A new broadcast service, designated FMX, has been developed as a solution to this problem. The improvements that may be achieved are analyzed, and it is demonstrated how audio companding may be implemented in future broadcast transmissions without compromising existing service.

JAES Volume 33 Issue 12 pp. 938-943; December 1985
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AES - Audio Engineering Society