Technique for suppressing particular audio component

An audio processing apparatus for generating, for each of unit segments of an audio signal, a processing coefficient train having coefficient values set for individual frequencies such that a target component of the audio signal is suppressed, said audio processing apparatus comprising:

• a processor configured to:
• generate a basic coefficient train where basic coefficient values corresponding to individual frequencies included within a particular frequency band range are each set at a suppression value that suppresses the audio signal while basic coefficient values corresponding to individual frequencies outside the particular frequency band range are each set at a pass value that maintains the audio signal;
• and
• generate the processing coefficient train for each of the unit segments by changing to the pass value, each of the basic coefficient values included in the generated basic coefficient train and corresponding to individual frequencies other than the target component among said basic coefficient values corresponding to the individual frequencies included within the particular frequency band range;
• a storage section storing therein a time series of reference tone pitches, and
• a correction section which corrects a fundamental frequency, indicated by frequency information, by a factor of 1 divided by 1.5 when the fundamental frequency indicated by the frequency information is within a predetermined range including a frequency that is one and half times as high as the reference tone pitch at a time point corresponding to the frequency information and which corrects the fundamental frequency, indicated by the frequency information, by a factor of 1 divided by 2 when the fundamental frequency is within a predetermined range including a frequency that is two times as high as the reference tone pitch.

A computer-implemented method for generating, for each of unit segments of an audio signal, a processing coefficient train having coefficient values set for individual frequencies such that a target component of the audio signal is suppressed, said method comprising:

• a step of generating a basic coefficient train where basic coefficient values corresponding to individual frequencies within a particular frequency band range are each set at a suppression value that suppresses the audio signal while basic coefficient values corresponding to individual frequencies outside the particular frequency band range are each set at a pass value that maintains the audio signal;
• a step of processing the generated basic coefficient train in such a manner that, when a sound generation point of any one of frequency components included within the particular frequency band range is detected, the basic coefficient values corresponding to a frequency of the one frequency component are each set at the pass value over a predetermined time period from the detected sound generation point;
• and
• a step of generating the processing coefficient train for each of the unit segments by changing, to the pass value, each of the basic coefficient values included in the processed basic coefficient train and corresponding to individual frequencies other than the target component among said basic coefficient values corresponding to individual frequencies within the particular frequency band range.

A non-transitory computer-readable storage medium storing a group of instructions for causing a computer to perform a method for generating, for each of unit segments of an audio signal, a processing coefficient train having coefficient values set for individual frequencies such that a target component of the audio signal is suppressed, said method comprising:

• a step of generating a basic coefficient train where basic coefficient values corresponding to individual frequencies within a particular frequency band range are each set at a suppression value that suppresses the audio signal while coefficient values corresponding to individual frequencies outside the particular frequency band range are each set at a pass value that maintains the audio signal;
• a step of processing the generated basic coefficient train in such a manner that, when a sound generation point of any one of frequency components included within the particular frequency band range is detected, the basic coefficient values corresponding to a frequency of the one frequency component are each set at the pass value over a predetermined time period from the detected sound generation point;
• and
• a step of generating the processing coefficient train for each of the unit segments by changing, to the pass value, each of the coefficient values included in the processed basic coefficient train and corresponding to individual frequencies other than the target component among said basic coefficient values corresponding to individual frequencies within the particular frequency band range.