There is provided a system for determining a sound source and a method thereof. The system comprises: an audio sensor; a biosensor for measuring one or more biosignals of a subject; and a processing unit communicatively coupled with the audio sensor and the biosensor, the processing unit configured to perform operations comprising: obtaining audio data from the audio sensor and biosignal data from the biosensor, the audio data and the biosignal data being time-synced with each other, detecting, based on the audio data, a sound exceeding a threshold, and determining that the sound exceeding the threshold originates from the subject if the biosignal data indicates a change in the one or more biosignals at a corresponding time.