Nonintrusive measurement of echo power and echo path delay prese

Details Nonintrusive measurement of echo power and echo path delay prese Nonintrusive measurement of echo power and echo path delay prese

1996-12-12

1998-08-11

Zele, Krista

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379 24, 379406, 704227, H04M 900, H04M 332

Patent

active

057938644

ABSTRACT:
A method for providing an echo power measurement of a transmission line having an echo path delay wherein a frequency domain adaptive filter is converged using samples collected from the transmission line that have been converted from a time domain to a frequency domain. A regression method is used to estimate the magnitude of taps of the frequency bins of the frequency domain adaptive filter that have been determined to be not accurately converged. In addition, a method and apparatus for measuring the echo path delay of a transmission line wherein a predetermined number of first time domain adaptive filters covering predetermined time periods are converged using samples collected from the transmission line that have been subband filtered to calculate a rough estimate of the echo path delay. Then, a second time domain adaptive filter is converged using the non-filtered samples to calculate a final echo path delay.

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Members of Technical Staff of Bell Telephone Laboratories, Transmission Systems for Communications, ch. 35.2 (5th Ed. 1982).

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