METHOD, DEVICE, AND PROGRAM FOR ESTIMATING AMOUNT OF ECHO PATH COUPLING; METHOD, DEVICE, AND PROGRAM FOR CONTROLLING ECHOES; METHOD FOR SUPPRESSING ECHOES; ECHO SUPPRESSOR; ECHO SUPPRESSOR PROGRAM; METHOD AND DEVICE FOR CONTROLLING AMOUNT OF LOSSES ON TRANSMISSION LINES; PROGRAM FOR CONTROLLING LOSSES ON TRANSMISSION LINES; METHOD, DEVICE, AND PROGRAM FOR SUPPRESSING MULTICHANNEL ECHOES; AND RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a method and device for estimating the amount of echo path coupling which does not require determination of the double talking state and can estimate the amount of echo path coupling even under the double talking state, and to provide various devices that use the estimating method.

SOLUTION: The frequency for each input signal, to which a receiving signal and an echo signal are added, is analyzed, and receiving signal power and input signal power for each frequency band are computed from the frequency coefficient. The power ratio of the input signal power to the receiving signal power is computed for each frequency band; and the minimum value of the power ratio computed for each frequency band is updated, the updated minimum value of the power ratio is retained, and the minimum power ratio retained for each frequency band is output as the amount of echo path coupling for each frequency band.

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