H - Electricity – 04 – B
Patent
H - Electricity
04
B
363/27
H04B 3/20 (2006.01) H04J 3/20 (2006.01)
Patent
CA 1056522
ABSTRACT OF THE DISCLOSURE The invention discloses a multiplex digital echo suppression system in which on each of the transmitting and receiv- ing sides the PCM signal for each channel is converted into an absolute value signal representing the absolute value of the PCM signal by eliminating the sign bit; thus converted signals are accumulated for a predetermined time in transmitting-side and receiving-side accumulators and then compared in a comparator so that an output is derived from the comparator when the accumulated signal in the transmitting-side accumulator is higher in level than the signal accumulated in the receiving-side accumulator; in response to the output signal from the comparator, a first timer is set to a first predetermined time during which a signal is derived from the first timer; when the signal level in the receiving-side accumulator is higher than a predetermined level of a threshold level comparator, an output is derived therefrom and applied to a second timer which in turn is set to a second predetermined time shorter than the time of the first timer, an output signal being derived from the second timer during said second predetermined time. The output from the first timer is applied to a receiving-side logic circuit which controls attenuation of the receiving-side PCM signal while the outputs from the first and second timers are applied to a transmitting-side logic circuit which controls echo suppression.
207291
Izumi Kazuo
Izumi Kazuto
LandOfFree
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