Echo canceller and echo suppressor for frequency divisional atte

Details Echo canceller and echo suppressor for frequency divisional atte Echo canceller and echo suppressor for frequency divisional atte

1983-09-15

1986-05-27

Rubinson, Gene Z.

1791706, H04B 320

Patent

active

045916705

ABSTRACT:
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 an adjustable 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.

REFERENCES:
patent: 3754105 (1973-08-01), Poschenreider et al.
patent: 3784747 (1974-01-01), Berkley et al.
patent: 4225754 (1980-09-01), Bernard et al.
patent: 4362909 (1982-12-01), Snijders et al.

Affiliated with

Also associated with

Rating

Echo canceller and echo suppressor for frequency divisional atte does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Echo canceller and echo suppressor for frequency divisional atte, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Echo canceller and echo suppressor for frequency divisional atte will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1571787