AM radio receiver with switchable IF bandwidth

Details AM radio receiver with switchable IF bandwidth AM radio receiver with switchable IF bandwidth

1991-01-18

1994-04-12

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455307, 455340, H04B 112

Patent

active

053034139

ABSTRACT:
A method for IF bandwidth switchover and an IF bandwidth switchover apparatus in an AM radio receiver are described. This kind of switchover is appropriate if radio transmitters not only transmit at the normal modulation bandwidth but also broadcast programs with an expanded bandwidth. To obtain optimal reception, the switchover is performed as a function of the reception conditions. To this end, the error rate of supplemental AM information, adjacent-channel interference and the signal strength can be evaluated. These criteria can be used either individually or in various combinations.

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patent: 4817820 (1989-03-01), Davis
patent: 4867484 (1989-08-01), Roberts
patent: 5095534 (1992-03-01), Hiyama et al.

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