Method of configurating acoustic correction filter for stringed instrument

A method of forming an acoustic correction filter applicable to a stringed instrument composed of a string member operable to undergo a vibration, a support member for supporting the string member, a body member responsive to the vibration transmitted through the support member for generating a natural sound and a mute attachment for muting the natural sound, the acoustic correction filter being operable when the natural sound is muted by the mute attachment for filtering a signal derived from the vibration so as to create an artificial sound instead of the muted natural sound, the method comprising the steps of:

• acquiring a first sample signal from the vibration under a mute state where the transmittance of the vibration to the body member is suppressed by the mute attachment to mute the natural sound;
• acquiring a second sample signal from the vibration under a free state where the body member is allowed to generate the natural sound in response to the vibration transmitted to the body member;
• extracting a difference between the acquired first sample signal and the acquired second sample signal;
• determining a correction characteristic of the acoustic correction filter based on the extracted difference;
• and
• forming the acoustic correction filter in accordance with the determined correction characteristic such that the acoustic correction filter can filter the signal so as to create the artificial sound comparable to the natural sound.

An apparatus for determining a correction characteristic of an acoustic correction filter applicable to a stringed instrument composed of a string member operable to undergo a vibration, a support member for supporting the string member, a body member responsive to the vibration transmitted through the support member for generating a natural sound and a mute attachment for muting the natural sound, the acoustic correction filter being operable when the natural sound is muted by the mute attachment for filtering a signal derived from the vibration so as to create an artificial sound instead of the muted natural sound, the apparatus comprising:

• an input section that inputs a first sample signal derived from the vibration under a mute state where the transmittance of the vibration to the body member is suppressed by the mute attachment to mute the natural sound, and inputs a second sample signal derived from the vibration under a free state where the body member is allowed to generate the natural sound in response to the vibration transmitted to the body member;
• an extracting section that extracts a difference between the inputted first sample signal and the inputted second sample signal;
• and
• a determining section that determines the correction characteristic of the acoustic correction filter based on the extracted difference such that the acoustic correction filter can filter the signal in accordance with the determined correction characteristic so as to create the artificial sound comparable to the natural sound.

An apparatus for outputting an acoustic signal applicable to a stringed instrument composed of a string member operable to undergo a vibration, a support member for supporting the string member, a body member responsive to the vibration transmitted through the support member for generating a natural sound and a mute attachment for muting the natural sound, the apparatus being operable when the natural sound is muted by the mute attachment for outputting the acoustic signal representative of an artificial sound instead of the muted natural sound, the apparatus comprising:

• an acquiring section that acquires a first sample signal from the vibration under a mute state where the transmittance of the vibration to the body member is suppressed by the mute attachment to mute the natural sound, and acquires a second sample signal from the vibration under a free state where the body member is allowed to generate the natural sound in response to the vibration transmitted to the body member;
• an extracting section that extracts a difference between the acquired first sample signal and the acquired second sample signal;
• a determining section operable based on the extracted difference to determine a correction characteristic for a performance signal inputted by performing a stringed instrument under the mute state;
• and
• an acoustic filter section having a filter that filters the performance signal in accordance with the determined correction characteristic so as to create the acoustic signal representative of the artificial sound comparable to the natural sound.