Circuit and method of suppressing inter-station radio tuning noi

Details Circuit and method of suppressing inter-station radio tuning noi Circuit and method of suppressing inter-station radio tuning noi

1985-12-24

1989-05-09

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455212, 455222, H04B 116

Patent

active

048295922

ABSTRACT:
To suppress tuning noise interferences, and particularly transients, such as whistles and the like, especially in FM receivers during returning of the receiver, an inter-station retuning muting circuit is, in accordance with the invention, modified by including therein a switchable filter (2) having a low-frequency cut-off (f.sub.g2) which is higher than the frequency of noise interference due to retuning of the receiver, the filter being switched to the higher frequency cut-off level for a period of time (T.sub.E) which exceeds the normal muting time (T.sub.E) of FM receivers.

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patent: 4580286 (1986-04-01), Richards, Jr.
patent: 4630290 (1986-12-01), Kage
patent: 4648128 (1987-03-01), Toffolo

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