Patent ID: 8750529

Claim:
A signal processing method, comprising: inputting audio signals on a plurality of channels; acquiring an acoustic type of an audio signal on at least one channel of the audio signals, the acoustic type being acquired every decision period; determining a target amount of sound-field effect for the acquired acoustic type; controlling a characteristic of sound-field effect, that includes at least a reflected sound or a reverberation sound, applied to the audio signals based on the acquired acoustic type; and performing a sound-field effect process with respect to at least one of the audio signals on the plurality of channels based on the controlled characteristic of sound-field effect by changing an amount of sound-field effect, the sound-field effect process being started when the acquired acoustic type is continuously the same in two or more decision periods, wherein when it is determined that the acquired acoustic type is changed from a previous acoustic type, the amount of sound-field effect is changed gradually to the target amount over at least one decision period.