One example discloses a kind of acoustics contrast means, and which includes：Acoustic processor, its are configured to receive the first acoustic signal and the second acoustic signal；Signal comparison module, its are configured to recognize the propagation delay between first and second acoustic signal or amplitude difference；And matching module, if which is configured to the propagation delay or amplitude difference between the first value and second value, then export pairing signal.Another example discloses a kind of method of the acoustics pairing between first device and second device, and methods described is executed by the computer programmed with non-transitory executable instruction, and methods described includes：Receive the propagation delay between the first acoustic signal and the second acoustic signal or amplitude difference；If the propagation delay or amplitude difference are between the first value and second value, then pairing first and second device.