FM data-system radio receiver

Details FM data-system radio receiver FM data-system radio receiver

1994-05-16

1996-04-09

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455 45, 455 46, 455202, 381 4, H04B 168

Patent

active

055070248

ABSTRACT:
An FM stereo radio data-system receiver has a front end including an FM discriminator that produces a composite signal composed of an AM stereo signal, including a 19 KHz pilot, and an AM digital-data signal. A dual-bandwidth phase locked loop (PLL) locks onto the pilot and serves both, as the decoder of the stereo portion of the composite signal, and as a generator of a strong stable 38 KHz carrier for use in regenerating the bit rate clock signal and for decoding the data-symbol signal of the digital-data portion of the composite signal. Advantages include economy of circuitry, a simpler and less costly high pass filter, and greater reliability in the decoding of the data signal.

REFERENCES:
patent: 4002991 (1977-01-01), Ogita
patent: 5202924 (1993-04-01), Richards, Jr.
patent: 5241687 (1993-08-01), Short
United States RBDS Standard, Draft No. 2.0, NRSC Document, Aug. 1, 1992 (pp. 1-4, 6-9, and Bibliography).
Specifications of the Radio Data System RDS for VHF/FM Sound Broadcasting, Tech. 3244--E, Mar. 1984, Technical Centre of the European Broadcasting Union, (pp. 1-10, and 59-60).
Single Chip RDS Demodulator+Filter, TDA7330 (technical sales bulletin) SGS-Thompson Microelectronics, May 1991, (3 pages).
Modern Digital and Analog Communication Systems, B. P. Lathi, Holt, Rinehart and Winston, 1983, (pp. 244-247 and References p. 343).

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