Tone detection for integrated telecommunications processing

Details Tone detection for integrated telecommunications processing Tone detection for integrated telecommunications processing

2006-02-21

2006-02-21

Isen, Forester W. (Department: 2644)

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

C379S386000, C379S282000, C379S283000, C379S351000, C379S284000

Reexamination Certificate

active

07003093

ABSTRACT:
Disclosed is an integrated tone detection processor for discriminating between tone and voice signals and determining the tones. The tone detection processor performs Automatic Gain Control (AGC) to normalize the power of the tone or voice signal. Further, the energy of the tone or voice signals are determined at specific frequencies utilizing a Goertzel Filter process. The tone detection processor determines whether or not a tone is present, and if a tone exists, determines the type of tone. Based upon determining the two maximum energy levels of the Goertzel filtered tone, whether the tone is a single tone, dual tone, silence, or other (e.g. speech) can be discriminated. The tone can then be identified by a user-defined dictionary of tones. Based upon various ON and OFF cadence checks in combination with the use of TONE ON and TONE OFF counters, tones can be declared.

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