DTMF transmission structure of W-CDMA WLL system
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United States of America Patent
Stats
-
Oct 26, 2004
Grant Date -
Jun 7, 2001
app pub date -
Dec 5, 2000
filing date -
Dec 7, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A DTMF transmission structure of a W-CDMA WLL system in which a DTMF signal is transmitted and received to and from a switching system through a terminal station and a base station controller, each of the terminal station and the base station controller comprising: an echo canceller for extracting an echo component from a received signal; a DTMF detector for discriminating whether a signal to be transmitted is a DTMF signal and controlling the operation of the echo canceller; an adder for adding the signal to be transmitted and the output of the echo canceller; a VOCODER for coding the output signal of the adder to a bit stream form or decoding the received signal in the bit stream form to an analog signal; an adjusted DTMF detector for detecting a digit component from the output of the VOCODER; a DTMF generator for reproducing a normal DTMF signal according to the detected digit component; and a silence generator for generating a silence for a predetermined time immediately after the DTMF signal is reproduced.
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