Modified multi-path detector

Details Modified multi-path detector Modified multi-path detector

1987-11-30

1989-10-31

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

With wave collector

455278, 455 65, H04B 110

Patent

active

048782521

ABSTRACT:
A receiver comprising a multi-path detector which comprises a frequency noise peak detector, an AM-detector and a weighting circuit. When noise peaks and amplitude modulations occur in an antenna input signal selected by a diversity switch on account of a control signal of the weighting circuit one of a number of antennas is switched to. This switching is audible to an annoying degree. By inserting a threshold arrangement (31, 32) in the detector, by means of a low-pass filter and a rectifier circuit, an instantaneous threshold voltage is generated varying with the frequency swing of the modulating signal. With a large swing, corresponding with a large amplitude of the modulating signal, switching is audible to a less annoying degree. On the other hand, at moments when the modulating signal has a small amplitude, switching may take place more frequently and is less audible because of the small amplitude of the modulating signal. Improved relaibility in detecting multi-path distortion is achieved by also supplying the instantaneous threshold voltage to the AM-detector.

REFERENCES:
patent: 4512034 (1985-04-01), Greerstein et al.
patent: 4566133 (1986-01-01), Rambo
patent: 4726073 (1988-02-01), Sessink

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