FM stereo tone detector

Details FM stereo tone detector FM stereo tone detector

1989-12-22

1991-03-19

Ng, Jin F.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 14, 381 12, 381106, H04H 500

Patent

active

050017578

ABSTRACT:
A stereo FM radio transmission system with FMX transmission and reception capability includes a transmitter that transmits a pilot-coherent FMX-tone indicator signal at a frequency of an exact integer submultiple of the pilot frequency. The system also includes a receiver for dividing the frequency of the received pilot signal by various submultiples, nearly equal to the exact submultiple, toward quickly finding a match in phase of the received tone and the received pilot and finally dividing the pilot by the exact submultiple to establish an operational lock mode of the receiver tone detector to keep-on an FMX-indicator lamp, to change the receiver decoder to an FMX-reception operating mode and to stand by to quickly recapture the pilot and FMX-tone in the event of multipath or other interfering signals.

REFERENCES:
patent: 4602380 (1986-07-01), Stebbings
patent: 4602381 (1986-07-01), Cugnini et al.
patent: 4607393 (1986-08-01), Nolde et al.
patent: 4618981 (1986-10-01), Ecklund
patent: 4679238 (1987-07-01), Markovic et al.
patent: 4680792 (1987-07-01), Tanaka et al.
patent: 4809328 (1989-02-01), Usui et al.
patent: 4852167 (1989-07-01), Usui et al.
patent: 4914680 (1990-04-01), Tanno et al.
T. Ishikawa et al., "FMX Decoder IC Development", IEEE Trans. on Consumer Electronics, vol. CE-33, No. 3, Aug. 1987, pp. 312-317.

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