Dynamically estimating echo return loss in a communication link

Details Dynamically estimating echo return loss in a communication link Dynamically estimating echo return loss in a communication link

2005-10-04

2005-10-04

Tran, Sinh (Department: 2644)

Telephonic communications

Echo cancellation or suppression

C379S406020, C379S406040, C379S406050, C379S406060, C379S406080, C379S406090, C379S406120

Reexamination Certificate

active

06952472

ABSTRACT:
A method of estimating an echo return loss of a communication link measures the peak power value of a signal received from a far end of a communication link and the corresponding peak power value of a signal received from the near end of the communication link. When the near end signal is free from near end voice and excessive noise, the near end corresponding peak will be the echo of the far end power. The far end power is monitored and when a peak is detected, a period, which can be equal to a filter length period, is initiated. When the period has run, the delay line attached to the near end is polled to determine the peak power in the delay line. This peak power will correspond to the far end peak. If a peak, exceeding the first peak is detected before the period has run, the period is reinitiated. The echo return loss estimate is calculated as a ratio of the far-end peak power value to the near-end peak power value. The measured far-end signal is the payload information that the communication link was established to convey and the measured near-end signal is the echo of the payload.

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