FM-Receiver comprising a search tuning system

Details FM-Receiver comprising a search tuning system FM-Receiver comprising a search tuning system

1979-10-22

1981-02-24

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455169, H03J 718

Patent

active

042531950

ABSTRACT:
FM-receiver comprising a search tuning arrangement, a control device for making the search tuning arrangement operative, a frequency discriminator and a stop-pulse generator having a threshold and being connected to an output of the frequency discriminator and supplying, when its threshold voltage is passed by the output voltage of the frequency discriminator, a stop-pulse for rendering the search tuning arrangement inoperative, the demodulation sensitivity of the frequency discriminator being brought from a maximum to a minimum level in order to prevent false stop-pulses from being generated in response to the fact the threshold voltage is exceeded by detected audio signals and said detection sensitivity being brought from the minimum to the maximum level when the search tuning arrangement is made operative, in order to enable tuning to weak and/or adjacent transmitters during the search tuning process.

REFERENCES:
patent: 2652486 (1953-09-01), Guyton
patent: 2764675 (1956-09-01), Guyton
patent: 2915625 (1959-12-01), Worcester
patent: 3020405 (1962-02-01), Schwarz
patent: 3568065 (1971-03-01), Pagany et al.
patent: 3665319 (1972-05-01), Worcester

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