Multi-tone signal discriminator

Details Multi-tone signal discriminator Multi-tone signal discriminator

2006-12-22

2011-11-01

Tsang, Fan (Department: 2614)

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

C379S283000, C379S386000, C455S067130, C708S311000

Reexamination Certificate

active

08050397

ABSTRACT:
In one embodiment, a method for discriminating between a machine generated multi-tone signal and a simulated voice multi-tone signal is provided. The method may comprise comparing output profiles generated from sampled outputs of a plurality of filters. The plurality of filters may have a single input sample stream applied to them and each filter may be preset at a measured multi-tone frequency associated with an identified prospective multi-tone signal. Based on the comparison of the output profiles, an inequality degree between the output profiles is generated and compared to an inequality threshold, thereby to determine whether the input sample stream comprises a machine generated multi-tone signal.

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