Call progress detection circuit

Details Call progress detection circuit Call progress detection circuit

1993-11-24

1994-09-20

Kwon, John T.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307524, 328138, H03D 1300

Patent

active

053492544

ABSTRACT:
A call progress detection circuit filters the audio input along parallel bandpass and band reject paths. The relevant band of frequencies is defined by the range of 350-620 Hz, within which band all of the call progress tones are found. The energy output from the bandpass path is compared to the energy output from the band reject path to determine if the audio input is generated by a call progress tone or by vocal input.

REFERENCES:
patent: 3605029 (1971-09-01), Freedman
patent: 3812432 (1974-05-01), Hanson
patent: 4215280 (1980-07-01), Mahig
patent: 4386239 (1983-05-01), Chien
patent: 4414517 (1983-11-01), Mahig
patent: 4525675 (1985-06-01), Richmond et al.

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