Processing method of audio signal using spectral envelope signal and excitation signal and electronic device including a plurality of microphones supporting the same

An audio signal processing method of an electronic device including a plurality of microphones, the method comprising:

• receiving a first audio signal from a first microphone among a plurality of microphones and obtaining a second audio signal through a second microphone among the plurality of microphones;
• detecting a wide-band spectral envelope signal from the first audio signal and extracting a narrow-band excitation signal from the second audio signal;
• extending a high-band signal of the second audio signal based on the wide-band spectral envelope signal from the first audio signal and the narrow-band excitation signal from the second audio signal to generate a high-band extension signal;
• and
• mixing the high-band extension signal and the first audio signal.

An electronic device including a plurality of microphones comprising:

• a first microphone, a communication circuit and at least one processor operatively connected to the first microphone and the communication circuit,
• wherein the at least one processor is configured to:
• when activating the first microphone, obtain a first audio signal through the first microphone;
• identify a noise level of the first audio signal obtained by the activated first microphone;
• when the noise level exceeds a specified value, activating a second microphone configured to generate a second audio signal through the communication circuit;
• when obtaining the second audio signal, extract a narrow-band excitation signal from the second audio signal;
• extend a high-band portion of the second audio signal based on the narrow-band excitation signal from the second audio signal and a wide-band spectral envelope signal extracted from the first audio signal, thereby resulting in a high-band extension signal;
• and
• mixing the high-band extension signal and the first audio signal.