Tone detection

Details Tone detection Tone detection

2005-07-05

2005-07-05

Isen, Forester W. (Department: 2644)

Telephonic communications

Supervisory or control line signaling

Signal receiver

C379S372000

Reexamination Certificate

active

06914979

ABSTRACT:
A DFT is used to compute the magnitude and phase of the frequencies desired to be detected in a frame of sampled data by performing 2 dot products for each such frequency. The two dot products are calculated using the samples in the frame and an equal number of equally spaced cosine and sine coefficients for each frequency to be detected.

REFERENCES:
patent: 5588053 (1996-12-01), Xie
patent: 5644634 (1997-07-01), Xie
patent: 5809133 (1998-09-01), Bartkowiak
patent: 6782095 (2004-08-01), Leong et al.

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