Digital majority noise filter for bi-level data reception
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United States of America Patent
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Dec 23, 1980
Grant Date -
N/A
app pub date -
Feb 1, 1979
filing date -
Feb 1, 1979
priority date (Note) -
Expired
status (Latency Note)
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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.
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