Radio receiver having switch for switching between a wide filter

Details Radio receiver having switch for switching between a wide filter Radio receiver having switch for switching between a wide filter

1991-05-28

1993-06-15

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455266, 455306, H04B 106

Patent

active

052206874

ABSTRACT:
A radio receiver is disclosed having a wide filter and a narrow filter, each of which is connected with the front end and outputs an intermediate frequency signal. To the output of the filters are connected first and second detectors, respectively. A subtracter receives the outputs of the detectors and subtracts one from the other. A switch receives the output of the subtracter and directs the outputs of detectors in such a way that the switch is switched to a first position for directing the demodulated output from the first detector to a following circuit when the difference is below a reference level, and to a second position for directing the demodulated output from the second detector to the following circuit when the difference is above the reference level.

REFERENCES:
patent: 3909735 (1975-09-01), Anderson et al.
patent: 4124817 (1978-11-01), Takahashi
patent: 4356567 (1982-10-01), Eguchi et al.

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