Gain automatic control device, method and audio processing device and earphone thereof
A technology of automatic gain control and earphones, applied in the direction of gain control, amplification control, electrical components, etc., can solve problems such as complex structure, achieve less hardware structure, avoid excessive output sound volume, and protect hearing
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[0018] As shown in FIG. 1 and FIG. 2 , two channels of audio signals enter a multiplexer 13 through input ports (including a first input terminal 10 a and a second input terminal 10 b ) of the automatic gain control device 1 . The multiplexer 13 has two output port groups 2 and 3 for transmitting two audio signals to an attenuation circuit 14 respectively. The attenuation circuit 14 has two attenuation branch groups 6 and 7 corresponding to the output port groups 2 and 3 of the multiplexer 13 respectively. The two audio signals are attenuated to a corresponding degree by the two attenuation branch groups 6 and 7 and then output to the output port (including a first output port 15 a and a second output port 15 b ) of the automatic gain control device 1 .
[0019] A signal sampling circuit 11 obtains the sampling signals of the output two-way audio signals from the first and second output terminals 15a, 15b and performs integral processing; an analog-to-digital converter 12 perf...
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