System and method for securing DTMF transmission
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United States of America Patent
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Dec 1, 1992
Grant Date -
N/A
app pub date -
Jan 2, 1991
filing date -
Jan 2, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A technique for inhibiting intelligible interception of information signals transmitted over a line from a first site to a second site. A masking signal is applied to the line immediately upon the detection of the information signal at the second site, but prior to the time at which the validity of the signal is verified. As long as the information signal remains on the transmission line, the masking signal is repeatedly turned on and off to thereby inhibit decoding of the signal by an eavesdropping device.
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