Call recording device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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N/A
Issued Date -
Jun 7, 2007
app pub date -
Nov 3, 2006
filing date -
Nov 4, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
This call recording device includes: a transmission signal processing unit that superimposes a probe signal on a transmitted voice signal; a reception signal processing unit that monitors a received voice signal and that detects the probe signal included in the received voice signal, and decides the onhook/offhook condition of the telephone in accordance with the probe signal thus detected; and a data transmission processing unit that executes recording process when the offhook condition is identified. The reception signal processing unit includes: a PSK demodulator that demodulates the received voice signal; a correlator that calculates a correlation value of the demodulated signal and a replica code pattern corresponding to the probe signal; and a decision processing unit that decides that the telephone is in the offhook condition if the integrated value of the correlation value is at least a prescribed threshold value.
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