Acoustic echo control based on temporal fluctuations of short-time spectra

Recently echo suppressors operating in a short-time spectral domain were introduced without a need for an adaptive FIR filter for echo path estimation. The echo path is modeled with merely a delay and a real-valued gain at each frequency, representing direct sound and early reflections. A weakness of this approach is, that these gains are biased when there is noise in the microphone signal. This paper proposes an improved method to estimate these gains, based on tempo-ral fluctuations of short-time spectra. It is shown that the proposed technique results in estimated gains without a bias when there is noise in the microphone signal