Digital majority noise filter for bi-level data reception

Details Digital majority noise filter for bi-level data reception Digital majority noise filter for bi-level data reception

1979-02-01

1980-12-23

Heyman, John S.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

328109, 328151, 329104, H03K 505, H03K 1332

Patent

active

042413117

ABSTRACT:
Apparatus for filtering high frequency noise pulses from alternating analog data of a frequency F, which includes means to convert the analog signal to a square wave bi-level signal, sampling the square wave signal at a clock frequency of at least 8F, loading the sampled signals into a digital shift register at the clock rate, reading out in parallel at least the last three samples, and passing said samples to a majority gate, which outputs a signal representing the majority polarity of the three signals read. The output of the majority gate is then applied to a latch in synchronism with the clock signal, which converts it back to a square wave signal representing the noise filtered version of the input signal.

REFERENCES:
patent: 3493874 (1970-02-01), Finkel et al.
patent: 3571712 (1971-03-01), Hellwarth et al.
patent: 3639848 (1972-02-01), Elliott
patent: 3659086 (1972-04-01), Metcalf
patent: 3815033 (1974-06-01), Tewksbury
patent: 3938052 (1976-02-01), Glasson et al.

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