Method of and means for detecting voice frequencies in telephone

Details Method of and means for detecting voice frequencies in telephone Method of and means for detecting voice frequencies in telephone

1975-04-23

1976-10-12

Stewart, David L.

179 15AS, G10L 102

Patent

active

039859568

ABSTRACT:
In order to detect the presence of voice frequencies on a telephone line which is periodically sampled for monitoring its activity, with conversion of resulting analog samples into binary words each including a polarity bit, the polarity bits of successive samples of a given line are fed to a zero-crossing detector emitting a pulse on every polarity reversal. The pulses pass through a shift register, which is stepped at the sampling rate, into a counter whose count is periodically read to determine whether a line-signal frequency, as represented by the number of zero crossings per test interval, or the rate of change of that frequency exceeds a certain threshold to indicate a fricative or sibilant sound introducing a spoken syllable.

REFERENCES:
patent: 3513260 (1970-05-01), Hellwarth
patent: 3573612 (1971-04-01), Scarr
patent: 3712959 (1973-01-01), Fariello
patent: 3878337 (1975-04-01), Fariello

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