FM radio receiver and signal processing device used therein

Details FM radio receiver and signal processing device used therein FM radio receiver and signal processing device used therein

1996-03-26

1998-05-12

Mullen, Thomas

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

375376, 4551861, H04B 118

Patent

active

057521760

ABSTRACT:
An SI judging circuit in a service detecting section detects a service identification code included in a block included in received superimposed FM data. When the block represents an unnecessary service, the SI judging circuit generates a predetermined service detecting signal, which is supplied to a station selecting microcomputer. A user operates a station selecting key to request the change of the broadcasting station. When the change is requested, and also the service detecting signal indicating that the service included in the received block is not needed is supplied to the station selecting microcomputer by the SI judging circuit, a control section of the station selecting microcomputer outputs station data corresponding to the requested station to a PLL synthesizer, and then the frequency signal (tuning frequency) is changed at a front end. This enables data received during a period for receiving blocks for unnecessary services to be NG, and can prevent data of blocks including necessary services from being NG.

REFERENCES:
patent: 4881273 (1989-11-01), Koyama et al.
patent: 5222254 (1993-06-01), Verron et al.
patent: 5239681 (1993-08-01), Parnall et al.
patent: 5404588 (1995-04-01), Henze
patent: 5444744 (1995-08-01), Yamamoto et al.

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