| 摘要 |
Disclosed is an integrated tone detection processor for discriminating betwe en tone and voice signals and determining the tones. The tone detection process or 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 determine d at specific frequencies utilizing a Goertzel Filter process. The tone detection processor determines whether or not a tone is present, and if a to ne 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 upo n 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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