Echo cancellation device, echo cancellation method, and program

An echo cancellation method for cancelling an echo included in a sound pickup signal picked up by a microphone placed at a near-end, comprising:

• calculating an acoustic coupling amount estimated value of a component of a reproduction signal, wherein the reproduction signal represents a sound signal picked up by a microphone placed at a far-end, and the calculating further comprises updating the acoustic coupling amount estimated value with a smaller amount as an update amount, as a magnitude of a component of the sound pickup signal other than an echo component is of the sound pickup signal increases;
• calculating a gain coefficient on the basis of the acoustic coupling amount estimated value;
• and
• generating, based on integrating the gain coefficient with the sound pickup signal, an echo cancellation signal.

A system for cancelling an echo included in a sound pickup signal picked up by a microphone placed at a near-end comprising:

• a processor;
• and
• a memory storing computer-executable instructions that when executed by the processor cause the system to perform a method, the method comprising:
• calculating an acoustic coupling amount estimated value of a component of a reproduction signal, wherein the reproduction signal represents a sound signal picked up by a microphone placed at a far-end, and the calculating further comprises updating the acoustic coupling amount estimated value with a smaller amount as an update amount, as a magnitude of a component of the sound pickup signal other than an echo component is in the sound pickup signal increases;
• calculating a gain coefficient on the basis of the acoustic coupling amount estimated value;
• and
• generating, based on integrating the gain coefficient with the sound pickup signal, an echo cancellation signal.