Apparatus, method, and computer program product for reproducing sound by dividing sound field into non-reduction region and reduction region

A sound reproducing method comprising

• adjusting amplitude and phase of a sound signal which is supplied as an input so as to restrain a synthesis sound pressure which is a combination of a sound pressure of a first sound output from a first sound source and a sound pressure of a second sound output from a second sound source at a predetermined distance from the first sound source, the first sound source outputting the first sound based on the sound signal, the second sound source outputting the second sound based on an adjusted sound signal and has a different distance decay rate from the first sound source, the distance decay rate representing a ratio of attenuation of sound pressure of sound output from a sound source to a distance from the sound source, and outputting the adjusted sound signal.

A sound reproducing method comprising

• adjusting amplitude and phase of one of a first sound signal to be input to a first sound source and a second sound signal to be input to a second sound source, so as to restrain a synthesis sound pressure which is a combination of a sound pressure of a first sound and a sound pressure of a second sound at a distance from one of the first sound source and the second sound source, the distance being longer than a distance represented by a value obtained by dividing a predetermined length by π, the first sound source having a length equal to or larger than the predetermined length in a predetermined direction and outputting the first sound based on the first sound signal, the second sound source having a length equal to or smaller than the predetermined length in the predetermined direction and outputting the second sound based on the second sound signal, and outputting the adjusted one of the first sound signal and the second sound signal as the other one of the first sound signal and the second sound signal.

A sound reproducing method comprising:

• determining a delay time for delaying a sound signal to be input to a first sound source selected from a plurality of sound sources arranged in a matrix fashion, so as to restrain a synthesis sound pressure which is a combination of a sound pressure of a sound output from the first sound source and a sound pressure of a sound output from a second sound source at a predetermined distance from the first sound source, the second sound source having a different distance decay rate from the first sound source and being selected from the plurality of sound sources, the distance decay rate representing a ratio of attenuation of sound pressure of sound output from a sound source to a distance from the sound source, and outputting a delayed sound signal which is obtained by delaying the sound signal by the delay time to the first sound source;
• and
• adjusting amplitude and phase of the sound signal, so as to restrain the synthesis sound pressure, and outputting an adjusted sound signal to the second sound source.

A computer program product having a computer readable medium including programmed instructions for performing sound reproduction, wherein the instructions, when executed by a computer, cause the computer to perform:

• adjusting amplitude and phase of a sound signal which is supplied as an input so as to restrain a synthesis sound pressure which is a combination of a sound pressure of a first sound output from a first sound source and a sound pressure of a second sound output from a second sound source at a predetermined distance from the first sound source, the first sound source outputting the first sound based on the sound signal, the second sound source outputting the second sound based on an adjusted sound signal and has a different distance decay rate from the first sound source, the distance decay rate representing a ratio of attenuation of sound pressure of sound output from a sound source to a distance from the sound source, and outputting the adjusted sound signal.

A computer program product having a computer readable medium including programmed instructions for performing sound reproduction, wherein the instructions, when executed by a computer, cause the computer to perform:

• adjusting amplitude and phase of one of a first sound signal to be input to a first sound source and a second sound signal to be input to a second sound source, so as to restrain a synthesis sound pressure which is a combination of a sound pressure of a first sound and a sound pressure of a second sound at a distance from one of the first sound source and the second sound source, the distance being longer than a distance represented by a value obtained by dividing a predetermined length by π, the first sound source having a length equal to or larger than the predetermined length in a predetermined direction and outputting the first sound based on the first sound signal, the second sound source having a length equal to or smaller than the predetermined length in the predetermined direction and outputting the second sound based on the second sound signal, and outputting the adjusted one of the first sound signal and the second sound signal as the other one of the first sound signal,and the second sound signal.

A computer program product having a computer readable medium including programmed instructions for performing sound reproduction, wherein the instructions, when executed by a computer, cause the computer to perform:

• determining a delay time for delaying a sound signal to be input to a first sound source selected from a plurality of sound sources arranged in a matrix fashion, so as to restrain a synthesis sound pressure which is a combination of a sound pressure of a sound output from the first sound source and a sound pressure of a sound output from a second sound source at a predetermined distance from the first sound source, the second sound source having a different distance decay rate from the first sound source and being selected from the plurality of sound sources, the distance decay rate representing a ratio of attenuation of sound pressure of sound output from a sound source to a distance from the sound source, and outputting a delayed sound signal which is obtained by delaying the sound signal by the delay time to the first sound source;
• and
• adjusting amplitude and phase of the sound signal, so as to restrain the synthesis sound pressure, and outputting an adjusted sound signal to the second sound source.