Signal detection and discrimination using waveform peak factor

Details Signal detection and discrimination using waveform peak factor Signal detection and discrimination using waveform peak factor

1985-12-31

1987-09-22

Rubinson, Gene Z.

Telephonic communications

Supervisory or control line signaling

Signal receiver

379 69, 379 92, 379209, 379257, H04M 322

Patent

active

046960317

ABSTRACT:
Apparatus and method for detecting and discriminating among various signals indicative of progress while making a telephone connection. A particular waveform parameter known as peak factor is advantageously employed in a call progress analyzer. The illustrative call progress analyzer uses the average magnitude peak factor (ratio of the peak of the waveform to the average of the absolute value of the waveform) to distinguish among single-tone signals (e.g., special service information tones), double-tone signals (e.g., dial tone, audible ring, and busy), and speech. Waveform ON and OFF times (duration above and below an energy threshold) are combined with signal-type determinations (made using peak factor) to automatically determine the status of a call.

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patent: 4570235 (1986-02-01), Kerdoncuff et al.
patent: 4626629 (1986-12-01), Premoli et al.

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