Audio signal processing system and surround signal generation method

An audio signal processing system comprising:

• an audio input signal inputting device that inputs audio input signals respectively corresponding to a plurality of channels;
• and
• a surround signal generation device that generates surround signals that have reflection sound and reverberate sound and that respectively correspond to the plurality of channels,
• wherein the surround signal generation device generates the surround signal corresponding to one channel based on an audio input signal corresponding to the one channel, a variable number changing within a predetermined range in response to a signal level of the surround signal at a preceding predetermined time corresponding to the one channel, and the audio input signal corresponding to other channel.

A surround signal generation method comprising:

• a step of inputting audio input signals respectively corresponding to a plurality of channels;
• and
• a surround signal generation step of generating surround signals that have reflection sound and reverberate sound and that are respectively correspond to the plurality of channels,
• wherein in the surround signal generation step, the surround signal corresponding to one channel is generated based on an audio input signal corresponding to the one channel, a variable number changing within a predetermined range in response to a signal level of the surround signal at a preceding predetermined time corresponding to the one channel and the audio input signal corresponding to other channel.

A surround signal generation processing program embodied in a computer-readable medium and representing a sequence of instructions, which when executed by a computer, the instructions cause the computer to function as:

• an audio input signal inputting device that inputs audio input signals respectively corresponding to a plurality of channels;
• and
• a surround signal generation device that generates surround signals that have reflection sound and reverberate sound and that respectively correspond to the plurality of channels,
• wherein the surround signal generation device generates the surround signal corresponding to one channel based on an audio input signal corresponding to the one channel, a variable number changing within a predetermined range in response to a signal level of the surround signal at a preceding predetermined time corresponding to the one channel, and the audio input signal corresponding to other channel.