Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent
1984-09-07
1986-12-09
Rubinson, Gene Z.
Telephonic communications
Subscriber line or transmission line interface
Network interface device
379345, H04B 320
Patent
active
046281576
ABSTRACT:
A "high" pass filter is employed to shape the low frequency input characteristic to a bidirectional repeater including echo cancelers. This frequency shaping eliminates excessive low frequency signal components from being supplied to the echo cancelers. Consequently, the number of taps, i.e., amplitude coefficients, required in the echo cancelers is minimized.
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D. L. Duttweiler, "Bell's Echo-Killer Chip",IEEE Spectrum, Oct. 1980, pp. 34-37.
Chance Christopher P.
Coble, Jr. Ralph P.
Ingle Edwin C.
Jones Joye A.
AT&T Bell Laboratories
Rubinson Gene Z.
Stafford Thomas
Vaas R.
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