Audio processing apparatus and control method thereof

A control method of an audio processing apparatus that includes a driving unit, a first microphone whose main acquisition target is sound from outside of the apparatus, and a second microphone whose main acquisition target is driving noise from the driving unit, compared with the first microphone, the method comprising:

• removing noise so as to generate two-channel audio data in which driving noise made by the driving unit has been reduced, based on a difference between time-series audio data acquired by the first microphone and time-series audio data acquired by the second microphone,
• wherein the removing includes:
• determining whether or not the driving noise occurred based on the difference between time-series audio data acquired by the first microphone and time-series audio data acquired by the second microphone,
• obtaining a correlation value between phases of time-series audio data acquired by the first microphone and time-series audio data acquired by the second microphone in a case where it is determined that the driving noise occurred in this determining,
• generating time-series audio data for which an error of an incident angle of sound from the outside to the first microphone and the second microphone was determined to exceed a preset threshold, out of time-series audio data acquired by the first microphone and time-series audio data acquired by the second microphone, based on the obtained correlation value,
• receiving inputs of time-series audio data acquired by the first microphone and time-series audio data corresponding to the first microphone and generated in the generating, performing adaptive filter processing, and generating audio data of one channel of stereo, and
• receiving inputs of time-series audio data acquired by the second microphone and time-series audio data corresponding to the second microphone and generated in the generating, performing adaptive filter processing, and generating audio data of the other channel of stereo.

A non-transitory computer-readable storage medium that stores a program of steps of a noise removing method that is read out and executed by a processor in an audio processing apparatus that includes a driving unit, a first microphone whose main acquisition target is sound from outside of the apparatus, and a second microphone whose main acquisition target is driving noise from the driving unit, compared with the first microphone, the method comprising:

• removing noise so as to generate two-channel audio data in which driving noise made by the driving unit has been reduced, based on a difference between time-series audio data acquired by the first microphone and time-series audio data acquired by the second microphone,
• wherein the removing includes:
• determining whether or not the driving noise occurred based on the difference between time-series audio data acquired by the first microphone and time-series audio data acquired by the second microphone,
• obtaining a correlation value between phases of time-series audio data acquired by the first microphone and time-series audio data acquired by the second microphone in a case where it is determined that the driving noise occurred in this determining,
• generating time-series audio data for which an error of an incident angle of sound from the outside to the first microphone and the second microphone was determined to exceed a preset threshold, out of time-series audio data acquired by the first microphone and time-series audio data acquired by the second microphone, based on the obtained correlation value,
• receiving inputs of time-series audio data acquired by the first microphone and time-series audio data corresponding to the first microphone and generated in the generating, performing adaptive filter processing, and generating audio data of one channel of stereo, and
• receiving inputs of time-series audio data acquired by the second microphone and time-series audio data corresponding to the second microphone and generated in the generating, performing adaptive filter processing, and generating audio data of the other channel of stereo.

An audio processing apparatus, comprising:

• a microphone for acquiring audio data;
• a driving unit;
• and
• a noise removing unit configured to remove driving noise that includes a plurality of peak frequencies caused by driving of the driving unit, from audio data acquired by the microphone,
• wherein the noise removing unit includes:
• a plurality of band pass filters in which the plurality of peak frequencies are respectively set, and which allow audio data in preset ranges that encompass the peak frequencies to pass,
• an addition unit configured to add audio data acquired by the plurality of band pass filters, and output audio data acquired in the addition as noise data, and
• an adaptive filter configured to perform adaptive filter processing for removing noise data acquired in addition performed by the addition unit, from audio data acquired by the microphone.

A control method of an audio processing apparatus that has a driving unit and a microphone, the method comprising;

• removing driving noise that includes a plurality of peak frequencies caused by driving of the driving unit, from audio data acquired by the microphone,
• wherein the removing includes:
• a plurality of processes of band-pass filtering in which the plurality of peak frequencies are respectively set, and which allow audio data in preset ranges that encompass the respective peak frequencies to pass,
• adding audio data acquired in the plurality of processes of band pass filtering, and outputting audio data acquired in the adding as noise data, and
• performing adaptive filter processing for removing noise data acquired in the adding, from audio data acquired by the microphone.

A non-transitory computer-readable storage medium that stores a program of steps of a noise removing method that is read out and executed by a processor in an audio processing apparatus that has a driving unit and a microphone, the method comprising:

• removing driving noise that includes a plurality of peak frequencies caused by driving of the driving unit, from audio data acquired by the microphone,
• wherein the removing includes:
• a plurality of processes of band-pass filtering in which the plurality of peak frequencies are respectively set, and which allow audio data in preset ranges that encompass the respective peak frequencies to pass,
• adding audio data acquired in the plurality of processes of band pass filtering, and outputting audio data acquired in the adding as noise data, and
• performing adaptive filter processing for removing noise data acquired in the adding, from audio data acquired by the microphone.