Detection of both voice and tones using Goertzel filters

Details Detection of both voice and tones using Goertzel filters Detection of both voice and tones using Goertzel filters

2005-09-27

2005-09-27

Tran, Sinh (Department: 2644)

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

C379S386000, C379S388040, C379S388050, C379S388060

Reexamination Certificate

active

06950511

ABSTRACT:
A plurality of Goertzel filters whose operating frequencies are distributed across the voice baseband are used to detect voice and control tones in a signal. Filters operating at frequencies of control tones and detecting that most of the signal energy occurs at those frequencies indicates presence of the control tones. At least three of the filters detecting that about 10% to 20% of the signal energy occurs at each of their operating frequencies indicate presence of voice. The total energy detected in the signal being below a noise threshold indicates presence of noise or silence.

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patent: 2002/0076034 (2002-06-01), Prabhu et al.

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