Adaptive echo cancellation device in a voice communication system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 6, 2001
Grant Date -
N/A
app pub date -
Jun 22, 1998
filing date -
Oct 31, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and device for adaptive echo cancellation in a voice communication system wherein a reference signal x is sent over the system from a transmitting device and comprising an adaptive filter for removing any echo signal from a primary signal d received in answer to reference signal x, and said adaptive filter having a plurality of coefficients the value of which at each time n being computed from the value of the same coefficient at time n-1 modified by a normalization factor depending upon the energy of said reference signal and provided by a normalization factor controlling unit. The normalization factor is the maximum value between a first value representing the energy of reference signal x at time n and a second value depending on a value of the normalization factor previously stored during a preceding predetermined interval time multiplied by an attenuation factor less than 1.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully