Process for determining an echo path flat delay and echo cancele

Details Process for determining an echo path flat delay and echo cancele Process for determining an echo path flat delay and echo cancele

1986-10-16

1988-08-16

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

370 321, H04B 323

Patent

active

047649550

ABSTRACT:
In a voice transmission network having an echo canceler including a flat delay line in series with an adaptive digital filter, a process is provided for adjusting the flat delay line length, thus enabling limiting the filter length to minimal value. The method is based on intercorrelation operations. It includes first intercorrelating sequences of energy values of blocks or consecutive samples, to derive a rough flat delay estimation therefrom; then intercorrelating sequences of signal samples with one of the sequences being roughly delayed, to derive therefrom an accurate flat delay estimation.

REFERENCES:
patent: 3535473 (1970-10-01), Flanagan et al.
patent: 3721777 (1973-03-01), Thomas
patent: 4024357 (1977-05-01), Sourgens et al.
patent: 4562312 (1985-12-01), Duttweiler
patent: 4582963 (1986-04-01), Danstrom
patent: 4587382 (1986-05-01), Yang
patent: 4613731 (1986-09-01), Godard
patent: 4645884 (1987-02-01), Barazeche et al.

Affiliated with

Also associated with

Rating

Process for determining an echo path flat delay and echo cancele does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for determining an echo path flat delay and echo cancele, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for determining an echo path flat delay and echo cancele will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-604811