Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Patent
1991-09-11
1994-04-12
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
455223, 455303, H04B 110
Patent
active
053034147
ABSTRACT:
A method and circuit for suppressing periodic noise interference in a broadcast signal received by a receiver, in which, during reception of the broadcast signal a dip occurs in the amplitude of the received broadcast signal each time noise interference is present, each dip having a slope, by the steps of: determining the values of the amplitude of the received signal; setting a basic received signal threshold value which is less than the value of the received signal at a time when no noise interference is present; during each occurrence of noise interference, increasing the threshold value by an amount proportional to the slope of the corresponding dip in the amplitude of the received signal; and acting on the received signal to suppress noise interference during a time when the amplitude of the received signal is below the increased threshold value produced by the increasing step.
REFERENCES:
patent: 3843928 (1974-10-01), Nishimura et al.
patent: 3983488 (1976-09-01), Bush et al.
patent: 4517518 (1985-05-01), Ishigaki
Patent Abstracts of Japan showing Abstract 59168725.
Eisenzopf Reinhard J.
Sobutka Philip J.
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