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

Claim 9:
10. 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 delayed by the delay time to generate the third sound signal, and the second sound signal is 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.