Echo suppressor using past echo path characteristics for updating

摘要

In an echo suppressor, a frequency bin component detector compares a far-end signal amplitude spectrum with a threshold value for each frequency bin to determine whether or not each frequency bin includes a frequency component. A frequency bin echo path characteristic estimator uses the far-end signal amplitude spectrum in the frequency bins determined to have a frequency component by the frequency bin component detector and the near-end input signal amplitude spectrum of corresponding frequency bins to estimate the echo path characteristics of the frequency bins. An estimated echo signal calculation-and-echo suppressor section calculates estimated echo signals based on the echo path characteristic in each frequency bin and the far-end signal amplitude spectrum to suppress the estimated echo signals from the near-end input signal amplitude spectrum.

主权项

1. An echo suppressor apparatus comprising:
a far-end signal amplitude spectrum calculator converting a far-end output signal into a frequency domain and calculating a far-end output signal amplitude spectrum of the far-end output signal; a near-end input signal amplitude spectrum calculator converting a near-end input signal into a frequency domain and calculating a near-end input signal amplitude spectrum of the near-end input signal; a frequency bin component detector using the far-end output signal amplitude spectrum to determine whether or not there is a frequency component in each of a plurality of frequency bins of the frequency domain of the far-end output signal; a frequency bin echo path characteristic estimator using both a far-end output signal amplitude spectrum of each determined frequency bin among said plurality of frequency bins determined to have a frequency component by said frequency bin component detector and a near-end input signal amplitude spectrum of a corresponding frequency bin of the near-end input signal, to estimate an echo path characteristic of said each determined frequency bin; an estimated-echo signal calculator calculating an estimated echo signal from the echo path characteristic for said each determined frequency bin; and an echo suppressor suppressing the estimated echo signal from the near-end input signal amplitude spectrum.