Method and electronic device for removing echo flowing in due to external device

An electronic device comprising:

• a communication module comprising communication circuitry;
• at least one microphone;
• a processor including processing circuitry;
• and
• memory storing instructions
• wherein the instructions, when executed by the processor, cause the electronic device to:
• make a connection with an external output device through the communication module;
• switch a call audio signal path to an external device output path in response to a call connection with a counterpart device;
• provide, to an echo cancellation module of the processor, a first signal which is a copy of a call audio signal received from the counterpart device;
• provide to the external output device through the external device output path, a second signal which is another copy of the call audio signal;
• obtain, through the at least one microphone, an echo signal corresponding to the second signal and which is output from a speaker of the external output device;
• measure a latency between the echo signal and the first signal provided by the echo cancellation module;
• adjust a size of a dynamic buffer for echo cancellation processing based on the measured latency;
• generate a reference signal by delaying the first signal by the adjusted size of the dynamic buffer;
• and
• remove the echo signal from a microphone input signal obtained from the at least one microphone based on the generated reference signal.