Electronic device and copyright protection method of audio data thereof

摘要

A copyright protection method of audio data applied to an electronic device. Left and right channel audio signal values are retrieved from audio signals of an audio source. Enveloping difference values between each left channel audio signal and each right channel audio signal are calculated to determine a time slot. The left channel audio signals and the right channel audio signals respectively modulated, thereby writing digital copyright information in corresponding positions of the time slot according to the modulation.

主权项

1. A copyright protection method of audio data of an electronic device, the method comprising:
extracting a plurality of left channel audio signal values and a plurality of right channel audio signal values from a plurality of audio signals of an audio source of the electronic device; calculating a plurality of difference values between each of the left channel audio signal values and each of the corresponding right channel audio signal values; determining a time slot which is formed by a plurality of first audio signal values corresponding to a plurality of first difference values among the difference values, wherein each of the first difference values exceeds a threshold value and a time length of the time slot exceeds a preset time; respectively modulating a plurality of first left channel audio signal values and a plurality of first right channel audio signal values for the first audio signal values; and writing digital copyright information in corresponding positions of the time slot according to the modulating result.