Interference wave detection circuit for use in radio receiver

Details Interference wave detection circuit for use in radio receiver Interference wave detection circuit for use in radio receiver

1983-03-23

1985-06-25

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455295, 455303, H04B 110, H04B 116

Patent

active

045258686

ABSTRACT:
An interference detector for use in determining when two carriers are producing a beat signal, comprising a low frequency automatic gain control amplifier 1' amplifying the received signal, a demodulator 5 and voice detector 6 for determining if the received signal is modulated, an amplitude detector 2 for measuring the amplitude of the amplifier output, a level measuring circuit 3 for measuring the beat component of the amplitude detector output, a comparator 4 for outputting an interference signal when the beat component exceeds a predetermined level, and a gate 7, 8 controlled by the voice detector for inhibiting the interference signal when the received signal is modulated.

REFERENCES:
patent: 3728634 (1973-04-01), Watkinson
patent: 3851263 (1974-11-01), Fukushima et al.
patent: 4038604 (1977-07-01), Koerber
patent: 4405835 (1983-09-01), Jansen et al.
"Angle-Modulated Signals Suffer Less AM Distortion", by Kongable, Electronics, 2/14/82.

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