Patent ID: 8737627

Claim:
A decoding method of audio data of an electronic device, the method comprising: extracting left channel audio signal values in a left channel and right channel audio signal values in a right channel from audio signals of a stereo audio source of an the electronic device; respectively filtering the left channel audio signal values and the right channel audio signal values to remove noise signals; performing a mathematical operation on the left channel audio signal values and the right channel audio signal values to generate absolute values; calculating difference values of the left and right channel audio signal values; determining time slots which are 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 multiplying the time slots with the left channel audio signal values and the right channel audio signal values to obtain LM 1˜n and RM 1˜n , wherein LM 1˜n represents a left channel audio signal value multiplied by the time slots and RM 1˜n represents a right channel audio signal value multiplied by the time slots, and then making subtraction to obtain DM 1˜n (DM 1˜n =LM 1˜n −RM 1˜n ); finding a U shaped pattern or an inverse U shaped pattern which meets proportionality from the waveform of DM 1˜n ; and decoding the written symbol “0” or “1” according to the found U shaped pattern or inverse U shaped pattern.