Recording and playing voicemail with improved DTMF detection
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United States of America Patent
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Feb 12, 2002
Grant Date -
N/A
app pub date -
Feb 5, 1998
filing date -
Feb 5, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A telephone system including improved voicemail wherein a digital signal processor scans data to be recorded in a voicemail message to find DTMF tones or DTMF mimics in the voice data and removes them from the recording. In one embodiment, the DSP scans for DTMF tones or mimics in the stream of data to be recorded and removes them before recording the data. In another embodiment, the DSP scans for DTMF tones and mimics in the stream of data to be recorded, and marks the starting point and ending point in the stream where DTMF tones or mimics are found, records all the data and then goes back to the recording after it is finished and looks for the markers and removes all data between the markers. In another embodiment, the DSP scans the data to be recorded, finds DTMF tones or mimics and then alters the data either in real time or off-line after it has been recorded to remove one or both tones of the DTMF signal so that it will not be recognized as a DTMF tone during playback by any DTMF detector which is active during the playback.
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