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

1984-12-21

1987-01-06

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Modulation distortion or cross talk correction or elimination

455303, 455206, 375102, H04B 110

Patent

active

046352988

ABSTRACT:
An interference wave detection circuit is designed so as to detect whether a beat due to the difference between two carrier wave frequencies is included or not in a received signal for a radio receiver. The detection circuit comprises circuitry for deriving a first binary signal corresponding to a level of a signal of voice frequency band obtained by demodulating the received signal and for deriving a second binary signal corresponding to a level of an envelope signal of an intermediate frequency signal from the received signal to provide a predetermined time difference between the first and second binary signals. The detection circuit further comprises a spoken message detection circuit for detecting that a carrier wave is modulated in a spoken message of the received signal, and a correlation detection circuit for detecting correlation between the first and second binary signals when the output of the spoken message detection circuit is not produced, thereby producing an interference detection signal when the correlation therebetween is detected.

REFERENCES:
patent: 4166251 (1979-08-01), Ishigaki et al.
patent: 4498195 (1985-02-01), Ooi et al.
patent: 4525868 (1985-06-01), Kage et al.

Affiliated with

Also associated with

Rating

Interference wave detection circuit for use in radio receiver does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Interference wave detection circuit for use in radio receiver, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interference wave detection circuit for use in radio receiver will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-689796