Audio signal processing device and operating method therefor

An audio signal processing method performed by an audio signal processing device, which includes an internal microphone, the audio signal processing method comprising:

• in response to an external voice input device being used to receive an external audio signal, obtaining a first audio signal by generating a pattern in an audio signal to be output, wherein generating the pattern comprises, at a selected time point of the audio signal, adjusting a magnitude of one or more frequency components of the audio signal such that the adjusted magnitude is greater than or equal to a predetermined reference value or less than or equal to a predetermined reference value;
• outputting the first audio signal;
• receiving, through a microphone of the external voice input device while the external voice input device is connected to the audio signal processing device, a second audio signal including the output first audio signal;
• detecting the pattern from the second audio signal;
• receiving, through the internal microphone, a third audio signal including the output first audio signal;
• detecting the pattern from the third audio signal, wherein detecting the pattern from the second audio signal and from the third audio signal comprises identifying, in the second audio signal and in the third audio signal, the one or more frequency components whose magnitudes are greater than or equal to the predetermined reference value or less than or equal to the predetermined reference value at the selected time point;
• and
• synchronizing the second audio signal with the third audio signal based on a difference between a time point at which the pattern is detected from the third audio signal and a time point at which the pattern is detected from the second audio signal.

An audio signal processing device, comprising:

• a speaker to output an audio signal;
• a memory to store one or more instructions;
• and
• a processor configured to execute the one or more instructions stored in the memory to:
• in response to an external voice input device being used to receive an external audio signal, obtain a first audio signal by generating a pattern in an audio signal to be output, wherein generating the pattern comprises, at a selected time point of the audio signal, adjusting a magnitude of one or more frequency components of the audio signal such that the adjusted magnitude is greater than or equal to a predetermined reference value or less than or equal to a predetermined reference value;
• control the speaker to output the first audio signal;
• receive, through a microphone of the external voice input device while the external voice input device is connected to the audio signal processing device, a second audio signal including the output first audio signal;
• detect the pattern from the second audio signal, wherein detecting the pattern comprises identifying, in the second audio signal, the one or more frequency components whose magnitudes are greater than or equal to the predetermined reference value or less than or equal to the predetermined reference value at the selected time point;
• and
• synchronize the second audio signal with the first audio signal by comparing the pattern detected from the second audio signal and the pattern included in the first audio signal.