Method for monitoring telephone call progress

Details Method for monitoring telephone call progress Method for monitoring telephone call progress

1991-06-10

1994-06-28

Chin, Stephen

Telephonic communications

Telephone line or system combined with diverse electrical...

To produce visual-graphic copy

379112, 379386, 358434, 358435, H04M 1100

Patent

active

053254252

ABSTRACT:
A call progress monitor and algorithm for placing a telephone call over the telephone lines. The algorithm is hierarchically arranged having three major routines or portions: tone detection, signal recognition and situation recognition. The tone detection portion of the algorithm measures the power at each of a predetermined number of frequencies of interest. In accordance with one improvement, the data is sampled at a fraction of the rate at which it is supplied, for example, on a T1 channel. The signal recognition portion of the algorithm detects the presence of a particular signal and this stage of the algorithm has been modified to more precisely detect voice. Specifically, power within a voice filter band is compared with power at other predetermined frequencies and a decision is made based on this information. Furthermore, another improved aspect is that data for an entire Epoch is accumulated and stored in a buffer prior to processing as a group. The situation recognition portion of the algorithm determines that a certain sequence or pattern of signals has occurred with a particular timing or cadence.

REFERENCES:
patent: 4924493 (1990-05-01), Dang et al.
patent: 5057941 (1991-10-01), Moriya
patent: 5204757 (1993-04-01), Agudelo et al.

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