Call progress monitor circuitry and method for a communication system
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United States of America Patent
Stats
-
May 14, 2002
Issued Date -
N/A
app pub date -
Mar 4, 1998
filing date -
Apr 22, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A call progress monitor circuit is disclosed for a digital DAA in which digital information is transmitted across an isolation barrier from phone line side circuitry to powered side circuitry. In particular, the call progress monitor circuit of the present invention converts oversampled digital transmit and receive data into analog transmit and receive signals and then combines them to produce a call progress signal that is provided to be fed to a speaker driver circuit. In addition, the call progress signal in one embodiment is filtered with a low pass filter. The call progress monitor circuit in one embodiment includes oversampled digital-to-analog converters, a summing circuit, and a low pass filter. Corresponding methods for monitoring the progress of a call utilizing oversampled digital transmit and receive signals are also disclosed.
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