Audio signal processing method and mobile apparatus

A mobile apparatus, comprising:

• an embedded microphone, used for sound reception;
• a communication transceiver, communicatively connected to an external microphone and used to receive signals from the external microphone;
• and
• a processor, coupled to the embedded microphone and the communication transceiver, and configured to perform:
• determining a target direction in a plurality of sound-reception directions and a target distance corresponding to the target direction according to a plurality of first audio signals in the sound-reception directions received by the embedded microphone, wherein a primary sound source is located in the target direction and at the target distance from the embedded microphone, the target direction is determined based on a correlation between the first audio signals and a second audio signal received by the external microphone, and the target distance is determined based on signal power of a first audio signal in the target direction;
• selecting a target algorithm from a plurality of blind signal separation (BSS) algorithms according to the target direction and the target distance, wherein the target algorithm is determined based on an included angle between the target direction and an interference source sound direction and a magnitude of the target distance, and the interference source sound direction corresponds to an interference sound source;
• and
• setting the first audio signal received by the embedded microphone at the target direction as a secondary signal of the target algorithm, setting the second audio signal received by the external microphone as a primary signal of the target algorithm, and separating an audio signal of the primary sound source from the primary signal and the secondary signal through the target algorithm.