Method of decreasing the effect of an interference sound and sound playback device

A sound playback device, comprising:

• a first microphone, used for receiving an input sound to acquire a first sound signal, wherein the first sound signal comprises at least one first localization judgement signal;
• a second microphone, used for receiving the input sound to acquire a second sound signal, wherein the second sound signal comprises at least one second localization judgement signal and both the at least one first localization judgement signal and the at least one second localization judgement signal have a plurality of sound frame;
• wherein both the at least one first localization judgement signal and the at least one second localization judgement signal have a selected frequency and a wavelength of the at least one first localization judgement signal and the wavelength of the at least one second sound signal are larger than a distance between the first microphone and the second microphone;
• and
• a microcontroller, electrically connected to the first microphone and the second microphone, the microcontroller comprising:
• a low-frequency sound signal analysis module, used for determining a plurality of phase differences between each of the same sound frames of the first localization judgement signal and the second localization judgement signal with the same selected frequency in a predetermined frame numbers and determining and acquiring a plurality of sound source localization data according to each of the plurality of phase differences;
• a computing module, used for determining a probability that a main direction of a source of the input sound is in accordance with a target orientation according to each of the sound source localization data;
• and
• a low-frequency sound signal processing module, used for adjusting, according to the probability, the sound volume of low-frequency sound signals of the first sound signal and the second sound signal being outputted.