Precise call progress detector
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United States of America Patent
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-
May 3, 1988
Grant Date -
N/A
app pub date -
Aug 12, 1985
filing date -
Aug 12, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A circuit for providing a dynamic noise floor level. An analog to digital converter provides one of a plurality of outputs as determined by the level of an input signal. A comparator compares each digital input signal with the signal latched in a storage device. For an increasing digital signal the value is latched in a storage device. If the signal is decreasing, the value stored in the storage device is decremented by 1. The output of the storage device is coupled to a demultiplexor for digital to analog conversion. The outputs of the demultiplexor are coupled to a plurality of capacitors of varying capacitance so that a range of output signals may be achieved. The analog output of the circuit is used as a noise floor level in a precise call progress detector.
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