Patent ID: 11955132
Assignee: ACER INCORPORATED
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 1:
2. The method according to claim 1, wherein determining the noise interference comprises:
generating a pre-processed sound signal according to a delay time and the synthesized sound signal, wherein the pre-processed sound signal is obtained from the synthesized sound signal being phase-shifted and delayed by the delay time;
respectively generating a first sound signal and a second sound signal according to the synthesized sound signal and the pre-processed sound signal, wherein the at least one code comprises a first code and a second code, the at least one reflection-cancelling sound signal comprises the first sound signal and the second sound signal, the first sound signal cancels the synthesized sound signal in a case where the watermark identification code is the first code, and the second sound signal cancels the synthesized sound signal in a case where the watermark identification code is the second code;
generating a third sound signal according to the first sound signal, and generating a fourth sound signal according to the second sound signal, wherein the first sound signal is phase-shifted and delayed by the delay time to generate the third sound signal, and the second sound signal is phase-shifted and delayed by the delay time to generate the fourth sound signal; and
respectively determining a first correlation and a second correlation according to the third sound signal and the fourth sound signal, wherein the first correlation is a correlation between the first sound signal and the third sound signal, the second correlation is a correlation between the second sound signal and the fourth sound signal, and a difference between absolute values of the first correlation and the second correlation corresponds to a magnitude of the noise interference.