Multi-device audio playback correction method and device

A multi-device audio playback correction device, comprising:

• a connecting unit configured to connect to a plurality of playback devices and assign a corresponding sound channel to each of the playback devices;
• a signal superimposing and transmitting unit configured to transmit superimposed audio signals to the playback devices and record one or more start transmitting time points of the superimposed audio signals transmitted to the playback devices;
• a receiving unit configured to receive audio playback signals transmitted by the playback devices and record receiving time points of the audio playback signals transmitted by the playback devices;
• a calculating unit configured to obtain a transmission delay sequence corresponding to the playback devices by subtracting the one or more start transmitting time points from the receiving time points;
• and
• a correcting unit configured to correct an audio playback time of each of the playback devices according to the transmission delay sequence;
• wherein the signal superimposing and transmitting unit is configured to record frequencies of ultrasonic signals corresponding to the playback devices, wherein the frequencies of the ultrasonic signals transmitted to the playback devices are different from each other, and the signal superimposing and transmitting unit is configured to transmit the superimposed audio signals to all the playback devices and record the one or more start transmitting time points;
• wherein the multi-device audio playback correction device is configured to:
• obtain the transmission delay sequence of all playback devices, compare all transmission delays included in the transmission delay sequence, determine a minimum transmission delay;
• calculate a difference between each transmission delay in the transmission delay sequence and the minimum transmission delay;
• and advance a transmission time of the superimposed audio signals to the playback devices accordingly based on the difference between each transmission delay in the transmission delay sequence and the minimum transmission delay.