Patent ID: 9531884
Filing Date: 2016-12-27
CPC Classification: H04M,H04R,H04S,H04W

Claim Text:
1. A stereo echo suppressing device that suppresses an acoustic echo signal based on a near-end input signal and far-end signals of two channels as a stereo signal, the stereo echo suppressing device comprising: a first far-end signal amplitude spectrum calculating unit configured to calculate an amplitude spectrum of a first far-end signal by transforming the inputted first far-end signal into a spectrum in a frequency domain; a second far-end signal amplitude spectrum calculating unit configured to calculate an amplitude spectrum of a second far-end signal by transforming the inputted second far-end signal into a spectrum in a frequency domain; a near-end input signal amplitude spectrum calculating unit configured to calculate an amplitude spectrum of the near-end input signal by transforming the inputted near-end input signal into a spectrum in a frequency domain; a first estimation echo signal estimating unit configured to estimate an amplitude spectrum of a first estimation echo signal by multiplying a stored first echo path characteristic by the amplitude spectrum of the first far-end signal; a second estimation echo signal estimating unit configured to estimate an amplitude spectrum of a second estimation echo signal by multiplying a stored second echo path characteristic by the amplitude spectrum of the second far-end signal; a first echo suppressing unit configured to suppress the acoustic echo signal superimposed on the near-end input signal by calculating a first echo suppression gain with the amplitude spectrum of the first estimation echo signal and the amplitude spectrum of the near-end input signal; a second echo suppressing unit configured to suppress the acoustic echo signal superimposed on the near-end input signal by calculating a second echo suppression gain according to a correlation result between the amplitude spectrum of the first estimation echo signal and the amplitude spectrum of the second estimation echo signal; a first echo path characteristic updating unit configured to calculate and update the echo path characteristic of the first far-end signal by using the amplitude spectrum of the first far-end signal and the amplitude spectrum of the near-end input signal; and a second echo path characteristic updating unit configured to calculate and update the echo path characteristic of the second far-end signal by using the amplitude spectrum of the second far-end signal and the amplitude spectrum of the near-end input signal.