FM/FMX stereophonic receiver

Details FM/FMX stereophonic receiver FM/FMX stereophonic receiver

1988-03-21

1990-04-10

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381106, H04H 500

Patent

active

049167413

ABSTRACT:
An FMX stereophonic receiver for receiving an FMX stereophonic broadcast signal, which includes a stereo sum signal, a stereo difference signal and a compressed stereo difference signal, is disclosed. When multipath interference takes place, noise signal will be produced, which adversely affects on a level control of an added signal of the stereo difference signal and the compressed stereo difference signal. The disclosed receiver includes a detector for detecting the multipath noise signal contained in the FMX stereophonic broadcast signal. When the multipath noise signal is detected, FMX receiving mode is automatically changed to FM receiving mode by a selecting means, so as to reduce the affect of the noise signal.

REFERENCES:
patent: 4195203 (1980-03-01), Sakai et al.
patent: 4485483 (1984-11-01), Torick et al.
patent: 4602380 (1986-07-01), Stebbings
patent: 4602381 (1986-07-01), Cugnini et al.
patent: 4674122 (1987-06-01), Orban
patent: 4704727 (1987-11-01), Beard
patent: 4742570 (1988-05-01), Ichikawa
patent: 4751734 (1988-06-01), Ructenwald
patent: 4752955 (1988-06-01), Torick
"Improving The Signal-To-Noise Ratio And Coverage of FM Stereophonic Broadcasts", E. L. Torick and T. B. Keller, Journal of the Audio Engineering Society vol. 33, No. 12, Dec., 1985.

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