Telephonic communications – Subscriber line or transmission line interface – Hybrid circuit
Patent
1993-07-14
1995-12-26
Hofsass, Jeff
Telephonic communications
Subscriber line or transmission line interface
Hybrid circuit
379406, 379410, 379411, 379412, H04M 326
Patent
active
054795036
ABSTRACT:
Before starting the communication, a frequency characteristic measuring signal is outputted from a frequency characteristic measuring apparatus 9 to measure the frequency characteristic. Next, a frequency characteristic of a filter is set up based on the frequency characteristic obtained as a result of measuring by means of a digital filter 8. With this configuration, it is designed not to leave an echo signal even if this two-wire to four-wire switching exchanger is connected to any two-wire communication lines.
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"Digital Voice Echo Canceller with a TMS32020", Digital Signal Processing Applications with the TMS320 Family, Theory, Algorithms, and Implementations, Texas Instruments, Inc., 1986.
Hofsass Jeff
Mitsubishi Denki & Kabushiki Kaisha
Saint-Surin Jacques M.
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