Tone, modulated tone, and saturated tone detection in a...

Details Tone, modulated tone, and saturated tone detection in a... Tone, modulated tone, and saturated tone detection in a...

2007-10-02

2007-10-02

Tran, Sinh (Department: 2615)

Telephonic communications

Supervisory or control line signaling

Signal receiver

C704S213000

Reexamination Certificate

active

10652483

ABSTRACT:
In a voice activity detection (VAD) device a method for defining tone signals comprises defining a threshold for zero amplitude change, calculating a zero crossing rate of a signal, extracting a set of parameters from a plurality of duration periods of the signal, defining a tolerance threshold between the plurality of duration periods when a zero amplitude change occurs, calculating a maximum difference between the plurality of duration periods, and comparing the maximum difference with the threshold. The method is implemented in the International Telecommunications Union (ITU) recommendation G.729 Annex B VAD.

REFERENCES:
patent: 6526378 (2003-02-01), Tasaki
patent: 2004/0176062 (2004-09-01), Hsieh

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