Method and synthesizing impulse response and method for creating reverberation

A method of applying a reverberation effect to an audio signal, comprising:

• a dispersion calculation process for calculating a dispersion of phase characteristics in association with a given room based on a volume of the room, a degree of sound absorption of the room, and a distance between a sound source and a receiving point arranged in the room;
• a noise creation process for creating a noise having the dispersion of the phase characteristics calculated in the dispersion calculation process;
• a trend addition process for adding a phase trend to the noise created by the noise creation process in accordance with the distance between the sound source and the receiving point, and obtaining a phase characteristic of a minimum-phase component from the noise added with the phase trend;
• a synthesis process for synthesizing an impulse response based on the phase characteristic of the minimum-phase component;
• and
• a convolution process for applying a reverberation effect to an audio signal obtained from the sound source by convolving the audio signal with the synthesized impulse response.

A machine readable medium containing program instructions executable by a computer for performing an impulse response synthesis method which comprises:

• a dispersion calculation process for calculating a dispersion of phase characteristics in association with a given room based on a volume of the room, a degree of sound absorption of the room, and a distance between a sound source and a receiving point arranged in the room;
• a noise creation process for creating a noise having the dispersion of the phase characteristics calculated in the dispersion calculation process;
• a trend addition process for adding a phase trend to the noise created by the noise creation process in accordance with the distance between the sound source and the receiving point, and obtaining a phase characteristic of a minimum-phase component from the noise added with the phase trend;
• and
• a synthesis process for synthesizing an impulse response based on the phase characteristic of the minimum-phase component, the impulse response being used to create reverberation for the room.

An effector apparatus for applying a reverberation effect to an audio signal, comprising:

• an input device that inputs reverberation parameters in association with a given room, including a volume of the room, a degree of sound absorption of the room, and a distance between a sound source and a receiving point arranged in the room;
• a processing device that sequentially performs a dispersion calculation process for calculating a dispersion of phase characteristics in association with the room based on the inputted reverberation parameters, a noise creation process for creating a noise having the dispersion of the phase characteristics calculated in the dispersion calculation process, a trend addition process for adding a phase trend to the noise created by the noise creation process in accordance with the distance between the sound source and the receiving point and obtaining a phase characteristic of a minimum-phase component from the noise added with the phase trend, and a synthesis process for synthesizing an impulse response based on the phase characteristic of the minimum-phase component;
• and
• an output device that applies a reverberation effect to an audio signal obtained from the sound source by convolving the audio signal with the synthesized impulse response.