Patent ID: 9525552
Filing Date: 2016-12-20
CPC Classification: G10L,H04L,H04N

Claim Text:
1. An audio device for adding a watermark data to audio digital signals, the audio device comprising: a processor; and a storage system storing one or more software programs in form of computerized codes operable to be executed by the processor, the one or more software programs comprising instructions for: using a hash algorithm to generate a digital signature according to a hardware address of the audio device; searching an orthogonal code corresponding to the digital signature in a walsh matrix; decoding the audio digital signals according to the orthogonal code to output a decoded value, wherein obtaining a plurality of intermediate values as a result of multiplying on the audio digital signals by the orthogonal code, and obtaining the decoded value as a result of summing of the plurality of intermediate values; loading the orthogonal code into an identification information of the audio device to form the watermark data in accordance with a determination that the decoded value is not equal to one of a plurality of specific values, wherein the identification information comprises the hardware address of the audio device; and adding the watermark data into the audio digital signals.