Busy/no-answer call completion equipment
First Claim
1. Apparatus for recognizing a telephone call supervision signal by comparing its frequency and cadence to the frequency and cadence of at least one learned call supervision signal, comprising:
- a detector for receiving a first call supervision signal and outputting frequency parameters which indicate whether predetermined standard frequencies are present in the received signal;
a processor coupled to said detector for determining the first call supervision signal cadence and outputting a corresponding cadence parameter;
a memory for storing the frequency and cadence parameters for at least one call supervision signal;
means for selectively transmitting said cadence and frequency parameters of said first call supervision signal to said memory based on whether said first call supervision signal is to be learned;
said detector operable to receive a second call supervision signal and output a frequency parameter in response, said processor operable to determine the cadence of said second call supervision signal and output a cadence parameter in response; and
recognition circuits operable to compare the frequency and cadence parameters of said second signal with said frequency and cadence parameters of said first call supervision signal stored in memory.
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Accused Products
Abstract
Apparatus for recognizing a telephone call supervision signal by comparing its frequency and cadence to the frequency and cadence of a previously learned call supervision signal is provided as part of call completion equipment (10). Call progress tone detector (50) receives a call supervision signal and responds by outputting frequency parametric signals which indicate whether predetermined standard frequencies are present in the received signal. Microprocessor (74) determines the cadence of the received call supervision signal and outputs a corresonding cadence parametric signal. If it is beneficial to learn the received call supervision signal, the frequency and cadence parameters are stored in memory (78). Recognition circuits can then recognize a subsequent telephone call supervision signal by comparing its frequency and cadence parameters to the frequency and cadence parameters stored in memory (78) for at least one learned signal.
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Citations
6 Claims
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1. Apparatus for recognizing a telephone call supervision signal by comparing its frequency and cadence to the frequency and cadence of at least one learned call supervision signal, comprising:
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a detector for receiving a first call supervision signal and outputting frequency parameters which indicate whether predetermined standard frequencies are present in the received signal; a processor coupled to said detector for determining the first call supervision signal cadence and outputting a corresponding cadence parameter; a memory for storing the frequency and cadence parameters for at least one call supervision signal; means for selectively transmitting said cadence and frequency parameters of said first call supervision signal to said memory based on whether said first call supervision signal is to be learned; said detector operable to receive a second call supervision signal and output a frequency parameter in response, said processor operable to determine the cadence of said second call supervision signal and output a cadence parameter in response; and recognition circuits operable to compare the frequency and cadence parameters of said second signal with said frequency and cadence parameters of said first call supervision signal stored in memory. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification