Call Progress Tone Detector

The FX643 Call Progress Tone Detector uses different Tone detection methods from those commonly found with other products. Many traditional devices use a bandpass Filter followed by an energy detector. The Filter is usually designed to pass input signals with a frequency between about 300Hz and 700Hz, and the amplitudes of signals in this range are then checked against a level threshold. Any signal of acceptable level in this frequency band is classed as a Call Progress Tone including signals due to speech and noise. False outputs caused by speech are a common feature with these products, and background noise may lead to a stuck "detect" output. By Consumer Microcircuits Limited
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FX643 Application circuits
FX643 circuits
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