H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/87, 325/95
H04B 1/10 (2006.01) H04B 7/08 (2006.01)
Patent
CA 1274283
ABSTRACT In a receiver comprising a multi-path detector, the multi-path detector comprises a frequency noise peak detector, an AM-detector and a weighting circuit connected to the noise peak and AM detectors. 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 several antennas is switched to. This switching is audible to an annoying degree and should be limited. By inserting a threshold arrangement in the noise peak 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. When using this instantaneous threshold voltage it is achieved on the one hand that 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 and can take place more frequently and is less audible because of the small amplitude of the modulating signal. Improved reliability on detecting multi-path distortion is achieved by also supplying the instantaneous threshold voltage to the AM-detector.
554643
Fetherstonhaugh & Co.
Koninklijke Philips Electronics N.v.
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