H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/64
H04M 3/18 (2006.01) H04B 3/20 (2006.01)
Patent
CA 1204238
Abstract of the Disclosure: An echo cancelling circuit is composed of digital circuits, An echo canceller is supplied with lower send-in and receive-in components derived from a send-in and a receive-in digital signal, respectively, in a lower frequency band below a predetermined frequency, The echo canceller produces a lower digital signal component which is free from a lower echo signal component, The echo canceller furthermore produces a control signal indicative of presence and absence of a lower voice signal component in the lower send-in component, Controlled by the control signal and supplied with a higher send-in component of a frequency band higher than the predetermined frequency, an adjustable attenuator produces a higher digital signal component in which a higher echo signal component is suppressed with no attenuation and either a constant or a variable positive attenuation given to the higher send-in component when the control signal indicates presence and absence of the lower voice signal component, respectively, The lower and the higher digital signal components are combined into a send-out signal exempted from the echo signal, which may or may not comprise a reverberation signal introduced into the send-in digital signal by audible sound reproduced from a voice signal carried by the receive-in digital signal.
437961
Corporation Nec
Smart & Biggar
LandOfFree
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