Adaptive filter including a far end energy discriminator

Details Adaptive filter including a far end energy discriminator Adaptive filter including a far end energy discriminator

1981-03-05

1985-01-01

Rubinson, G. Z.

Electrical audio signal processing systems and devices

Hearing aids, electrical

Specified casing or housing

381101, H04B 320

Patent

active

044917015

ABSTRACT:
An energy discriminator is employed in conjunction with an adaptive filter to control updating of the filter transfer function characteristic. Specifically, the discriminator is employed to distinguish whether any significant received far end energy is only partial band or whole band. If the received energy is partial band the adaptive filter is inhibited from updating the transfer function characteristic during intervals that such energy is being received. On the other hand, if the received energy is determined not to be partial band and, hence, is whole band, the filter is enabled to update the transfer function characteristic during intervals that such energy is being received.
In a specific example, the discriminator is employed in an adaptive echo canceler to inhibit updating an echo path estimate being generated by an adaptive transversal filter when partial band energy is being received and enabling updating of the echo path estimate when whole band energy is being received.

REFERENCES:
patent: 3499999 (1970-03-01), Sondhi
patent: 3500000 (1970-03-01), Kelly et al.
patent: 3927260 (1975-12-01), Amundson et al.
patent: 4028496 (1977-06-01), LaMarche et al.
patent: 4028506 (1977-06-01), Araseki et al.
patent: 4072830 (1978-02-01), Gitlin et al.
patent: 4129753 (1978-12-01), Duttweiler
D. Duttweiler, IEEE Spectrum, "Bell's Echo-Killer Chip", Oct. 1980, pp. 34-37.
J. Otterman, IRE Transactions on Automatic Control, "The Properties and Methods for Computation of Exponentially-Mapped-Past Statistical Variables", Jan. 1960, pp. 11-17.

Affiliated with

Also associated with

Rating

Adaptive filter including a far end energy discriminator does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Adaptive filter including a far end energy discriminator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive filter including a far end energy discriminator will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-578367