Audio signal processing apparatus, audio signal processing method, program, and input apparatus

A method for processing audio signals for an audio reproduction system, comprising:

• extracting, by a first audio signal extracting section, a main audio signal from an input audio signal, wherein the main audio signal is representative of a first recorded localized source of sound in the input audio signal;
• extracting, by a second audio signal extracting section, a sub audio signal from the input audio signal, wherein the sub audio signal is representative of sounds in the input audio signal from multiple sources other than the source of the main audio signal;
• processing, by a sense-of-depth controlling section, the extracted main audio signal to control a sense of depth;
• adjusting, by a sense-of-depth volume adjustment section, a volume parameter of signals associated with the sense-of-depth controlling section;
• processing, by a sense-of-sound-expansion controlling section, the extracted sub audio signal to vary a sense of spatial sound expansion when the sub audio signal is reproduced by the audio reproduction system;
• adjusting, by a sense-of-sound-expansion volume adjustment section, a volume parameter of signals associated with the sense-of-sound-expansion controlling section;
• generating, by a control signal generating section, a first control signal with which the sense-of-depth controlling section is controlled and a second control signal with which the sense-of-sound-expansion controlling section is controlled;
• and
• mixing, by a mixing section, an output audio signal of the sense-of-depth controlling section and an output audio signal of the sense-of-sound-expansion controlling section, wherein
• the sense-of-depth volume adjustment section and the sense-of-sound-expansion volume adjustment section adjust the volume parameters of respective signals complementarily.

A non-transitory recording medium on which a program is recorded, the program causing a processor to execute acts of:

• extracting, by a first audio signal extracting section, a main audio signal from an input audio signal, wherein the main audio signal is representative of a first recorded localized source of sound in the input audio signal;
• extracting, by a second audio signal extracting section, a sub audio signal from the input audio signal, wherein the sub audio signal is representative of sounds in the input audio signal from multiple sources other than the source of the main audio signal;
• processing, by a sense-of-depth controlling section, the extracted main audio signal to control a sense of depth;
• adjusting, by a sense-of-depth volume adjustment section, a volume parameter of signals associated with the sense-of-depth controlling section;
• processing, by a sense-of-sound-expansion controlling section, the extracted sub audio signal to vary a sense of spatial sound expansion when the sub audio signal is reproduced by the audio reproduction system;
• adjusting, by a sense-of-sound-expansion volume adjustment section, a volume parameter of signals associated with the sense-of-sound-expansion controlling section;
• generating, by a control signal generating section, a first control signal with which the sense-of-depth controlling section is controlled and a second control signal with which the sense-of-sound-expansion controlling section is controlled;
• and
• mixing, by a mixing section, an output audio signal of the sense-of-depth controlling section and an output audio signal of the sense-of-sound-expansion controlling section, wherein
• the sense-of-depth volume adjustment section and the sense-of-sound-expansion volume adjustment section adjust the volume parameters of respective signals complementarily.