Signal processing apparatus, signal processing method, and program

A signal processing method comprising:

• learning an estimated transfer characteristic in a space through which a signal reproduced by a speaker is input to a microphone, and performing echo cancellation on a basis of the estimated transfer characteristic learned;
• detecting an environmental change;
• and
• causing a processor to learn the estimated transfer characteristic by causing the speaker to reproduce a sound for learning on a basis of detection of the environmental change.

A program for causing a computer to function as a signal processing apparatus that includes:

• an echo cancellation unit that learns an estimated transfer characteristic in a space through which a signal reproduced by a speaker is input to a microphone, and performs echo cancellation on a basis of the estimated transfer characteristic learned;
• and
• an environmental change detection unit that detects an environmental change,
• wherein the echo cancellation unit learns the estimated transfer characteristic by causing the speaker to reproduce a sound for learning on a basis of detection of the environmental change.