Detection of double talk in telecommunications networks

摘要

In one embodiment, the presence of double talk (DT) is detected in a telecommunications network having a near-end user and a far-end user. The energies of both (1) a signal received from the far-end user by the near-end user and (2) a signal to be communicated from the near-end user to the far-end user are computed. An echo return loss (ERL) estimate is calculated based on the energy calculations, and a preliminary decision is made as to whether DT is present based on the ERL estimate and the energy calculations. If DT is detected, then a counter is set to a hangover value. If DT is not detected, then the counter is reduced. This process is repeated, and, for each iteration, a final decision as to whether DT is present is made based on the counter value.

主权项

1. A method for detecting double talk in a telecommunications network, the method comprising:
(a) generating a measure of average energy of a near-end signal in the telecommunications network; (b) generating a measure of average energy of a far-end signal in the telecommunications network; (c) generating a double-talk (DT) decision statistic based on the near-end average energy measure and the far-end average energy measure, wherein step (c) comprises:
(c1) generating an estimate of echo return loss (ERL) based on the near-end average energy measure and the far-end average energy measure; and(c2) generating the DT decision statistic based on the ERL estimate, the near-end average energy measure, and the far-end average energy measure; and (d) generating a DT decision as to whether or not double talk is present in the telecommunications network based on the DT decision statistic.