Patent ID: 8626325

Claim:
An audio device, comprising: an audio processing module, to generate original audio signals; at least one processor, to generate identification data and control signals according to an input of a user, wherein the identification data is appended into the original audio signals according to the control signals; a storage unit, to store the identification data; a silence detection circuit, to detect silence segments of the original audio signals, and to generate driving signals if at least one of the silence segments of the original audio signals is detected; a condition determining circuit, to determine if the identification data needs to be appended into the silence segments of the original audio signals according to the driving signals and the control signals, and to output the identification data in direct current (DC) signal form if the identification data needs to be appended into the silence segments of the original audio signals; a DC level bias circuit, to bias DC voltage level of the identification data in DC signal form; an appending circuit, to append the biased identification data into the silence segments of the original audio signals; and a voltage follower connected between the audio processing module and the silence detection circuit and between the audio processing module and the appending circuit, to isolate the audio processing module and the silence detection circuit, isolate the audio processing module and the appending circuit, and buffer the original audio signals.