Patent ID: 9396733
Filing Date: 2016-07-19
CPC Classification: G10L

Claim Text:
1. A method, comprising: sampling audio into a digital audio format by a first sampler; protecting the audio by embedding ownership information into the sampled audio with a data processor according to variance calculation associated to the audio, wherein the quality of the protected audio is degraded but recognizable after embedding the ownership information into the audio; publishing the protected audio widely in a communication network as a trial for listen version; and providing a decoder to decode the protected audio for a user who purchased the copyright of the audio via the communication network by extracting the original audio from the protected audio, wherein the step of protecting comprises: obtaining a digital audio data array from the sampled audio; partitioning the digital audio data array according to the variance calculation of the digital audio data array; and combining the ownership information with the partitioned digital audio data array, and wherein the variance calculation comprises: forming a bit array variance V={V(i)}, wherein V(i) is bitwise variance which is found for every bigit i of the digital audio data array; and wherein V(i)=Σ