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

Claim 10:
11. An identifying apparatus of a sound watermark, comprising:
a memory, configured to store a programming code; and
a processor, coupled to the memory, and configured to load and execute the programming code to:
receive a synthesized sound signal through a network, wherein the synthesized sound signal comprises a sound watermark signal, the sound watermark signal is generated by shifting a phase of a reflected sound signal according to a watermark identification code, and the reflected sound signal is a sound signal obtained from simulating a sound emitted by a sound source reflected by an external object and recorded by a sound receiver;
determine noise interference transferred through the network in the synthesized sound signal according to at least one reflection-cancelling sound signal, wherein the at least one reflection-cancelling sound signal cancels a sound signal of the watermark identification code of the sound watermark signal being at least one code in the synthesized sound signal;
determine a coding threshold according to the noise interference, wherein the coding threshold comprises a first threshold and a second threshold, noise interference corresponding to the first threshold is lower than noise interference corresponding to the second threshold, and the first threshold is greater than the second threshold; and
identify the sound watermark signal in the synthesized sound signal according to the coding threshold.