Identifying method of sound watermark and sound watermark identifying apparatus
AssigneeAcer Incorporated
InventorsPo-Jen Tu, Jia-Ren Chang, Kai-Meng Tzeng
Life of this patent
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Abstract
An identifying method of a sound watermark and a sound watermark identifying apparatus are provided. The method includes the following. A synthesized sound signal is received through a network. Noise interference transferred through the network in the synthesized sound signal is determined according to a reflection-cancelling sound signal. A coding threshold is determined according to the noise interference. A sound watermark signal in the synthesized sound signal is identified according to the coding threshold.
Claims20
An identifying method of a sound watermark, the identifying method being adapted for a conference terminal, and the identifying method comprising:
- receiving 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;
- determining 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;
- determining 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
- identifying the sound watermark signal in the synthesized sound signal according to the coding threshold.
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.
Dependencies are inferred from the claim text.