Electronic device for converting number of audio channels, and electronic device operating method

An electronic device comprising:

• an output device configured to output audio;
• an audio output interface configured to receive the audio from the output device and to forward the audio to an external electronic device;
• an Application Processor (AP) comprising a Central Processing Unit (CPU);
• and
• an audio processing unit configured to:
• receive an audio stream of M channels from the CPU,
• convert the M-channel audio stream into an N-channel audio stream, the N-channel being different from the M-channel,
• output the N-channel audio stream through the output device, wherein the audio processing unit is further configured to:
• detect a connection with the external electronic device through the audio output interface;
• determine whether to stop the converting the M-channel audio stream into the N-channel audio stream, based on information received from the CPU;
• and
• transmit, via the audio output interface, the M-channel audio stream to the external electronic device in response to the determination of stopping the converting the M-channel audio stream into the N-channel audio stream,
• wherein the audio processing unit is further configured to:
• generate N-M dummy data;
• generate audio streams of N-M channels by copying the N-M dummy data to the the M-channel audio stream;
• and
• convert the N-channel audio stream on the basis of the M-channel audio stream and the audio streams of N-M channels.