Frequency limiter

Details Frequency limiter Frequency limiter

1977-10-21

1978-12-26

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358284, 325 30, 178 66R, H04N 140

Patent

active

041319176

ABSTRACT:
Frequency modulated pulses representing dark/light variations on a document are applied to a frequency limiting circuit prior to synthesizing a low distortion sinewave voice band signal from the pulses. The frequency limiting circuit detects the frequency of the pulses and divides the frequency when the frequency exceeds a predetermined level. Detection of frequencies in excess of the predetermined level is achieved by a counter which counts clock pulses applied to the counter during each cycle of the frequency modulated pulses to determine the time between pulses and thus the frequency of the pulses. A gate only passes the pulses after a predetermined count has been reached.

REFERENCES:
patent: 3392232 (1968-07-01), Cohen
patent: 3706842 (1972-12-01), Robertson
patent: 3735034 (1973-05-01), Richeson, Jr.
patent: 3813483 (1974-05-01), Kurosawa et al.
patent: 3845242 (1974-10-01), Richeson, Jr. et al.

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