Noise blanking circuitry in a radio receiver

Details Noise blanking circuitry in a radio receiver Noise blanking circuitry in a radio receiver

H - Electricity

04

B

325/89

H04B 1/10 (2006.01) H03G 3/34 (2006.01)

Patent

CA 1145403

Abstract A radio receiver including an RF amplifier stage arranged to receive transmitted RF signals and noise signals from an antenna, a mixer stage for converting the RF signals to intermediate frequency (IF) signals and supplying the IF signals to a blanker gate receiving blanking signals from a blanking signal source, the gate normally passing IF signals to discriminator means to demodulate the IF signals to audio signals, but decoupl- ing the mixer stage from the demodulator when the blank- ing signal is present. The audio signal output from the discriminator is applied to a noise squelch circuit which detects noise frequencies above a predetermined fre- quency. If the predetermined frequency is exceeded, a squelch signal is generated to block or mute the audio signals. In the present invention, the squelch circuit employs an averaging detector instead of a peak detector in order to eliminate short duration spikes in the squelch circuit. The blanking signal generator circuit employs a tracking pulse detector which is immune to false triggering by maintaining the detector threshold.

347886

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