Noise blanker

Details Noise blanker Noise blanker

1982-07-06

1984-10-23

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Squelch

455223, H04B 110

Patent

active

044792514

ABSTRACT:
A noise blanker circuit protects a signal processing circuit from unwanted noise spikes by interrupting the signal path when it exceeds a preestablished threshold or reference level. The detector itself is a two branch detector that has in one branch a variable gain amplifier that is controlled by an automatic gain control signal and a comparator. The other branch of the circuit has a delay network which delays the signal by the propagation delay of the variable gain amplifier in the comparator and applies it to a switch, which when activated by the output signal from the comparator, will interrupt the second branch to ground and thus protect the remainder of the circuit.

REFERENCES:
patent: 3230458 (1966-01-01), Stangeland
patent: 3620631 (1971-11-01), Stopka et al.
patent: 3699457 (1972-10-01), Wright
patent: 3725674 (1973-04-01), Schaeffer et al.
patent: 4024463 (1977-05-01), Pelley
patent: 4189679 (1980-02-01), Amazawa et al.
patent: 4216430 (1980-08-01), Amazawa et al.

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