Patent ID: 8433074

Claim:
An echo suppressing method comprising: using a signal that is transformed in a frequency domain from either an output signal of a sound pickup device or a signal obtained by subtracting the output signal of said sound pickup device after echo suppression from the output signal of said sound pickup device as a first signal; using a signal that is transformed in a frequency domain from the output signal after echo suppression as a second signal; multiplying said second signal by an estimated crosstalk value; estimating an amount of echo contained in said first signal based on the multiplication result; and suppressing the echo component in said first signal by using the estimated amount of echo, wherein the suppressed first signal is limited not to be smaller than an estimated value of near-end noise estimated for each frequency range in the frequency domain, wherein the estimated crosstalk value is a crosstalk coefficient that is a predetermined value and used to calculate the amount of crosstalk of said echo leaking into said first signal, wherein the crosstalk coefficient used to correct said first signal is selected from a plurality of preset crosstalk coefficients according to a predetermined use condition, wherein said use condition is one or more from among the power or amplitude of the output signal of said echo canceller, the power or amplitude of a far-end signal, and the power or amplitude of a specific frequency component of said far-end signal, and wherein the crosstalk coefficient is changed in two steps according to the amplitude of the output signal of said echo canceller.