Echo suppressor using past echo path characteristics for updating

A non-transitory computer-readable storage medium storing an echo suppression program instructing a computer to function as:

• a far-end signal amplitude spectrum calculator converting an incoming far-end input signal into a frequency domain and calculating a far-end signal amplitude spectrum of the far-end 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;
• a frequency bin component detector comparing the amplitude spectrum of the far-end signal with a threshold value for a frequency bin to make a decision as to whether or not there is a frequency component in the frequency bin;
• a frequency bin echo path characteristic estimator using a far-end signal amplitude spectrum of the frequency bin 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 to estimate an echo path characteristic of the frequency bin;
• an estimated-echo signal calculator calculating an estimated echo signal from the echo path characteristic for the frequency bin estimated by said frequency bin echo path characteristic estimator and the far-end signal amplitude spectrum;
• and
• an echo suppressor suppressing the estimated echo signal from the near-end input signal amplitude spectrum.