Telephone line monitoring system

Details Telephone line monitoring system Telephone line monitoring system

1986-06-04

1988-05-03

Schreyer, Stafford D.

Telephonic communications

Supervisory or control line signaling

Signalling integrity protection

381 42, H04M 124, H04M 126

Patent

active

047425377

ABSTRACT:
A device for detecting voice signals in the presence of supervisory signals on a number of telephone lines so as to determine when machine-placed telephone calls have been answered. The device comprises a zero crossing detector for each telephone line monitored to determine the zero voltage crossings in the voltage of an incoming telephone signal, a latch associated with each detector for storing the occurrences of each zero voltage crossing detected and a microcomputer for processing the frequency-related information of the incoming telephone signals according to a voice detection algorithm. The voice detection algorithm comprises timer interrupt and analysis routines that direct the microcomputer to count the number of occurrences of different wavelengths of the waveforms composing an incoming telephone signal in determining the condition of response on a respective telephone line.

REFERENCES:
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patent: 4439639 (1984-03-01), Munter
patent: 4534041 (1985-08-01), Munter
patent: 4667065 (1987-05-01), Bangerter

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