The voltage-controlled decoder is the key control part of Dolby's directional logic surround sound. It decodes the Dolby-encoded two-channel signal into four independent signals, which are left, right, and surround, requiring high signal separation. The working principle of voltage control decoding is to compare the decoded output signals to obtain a control signal, and then use this signal to control the voltage control amplifier of each channel, and suppress the crosstalk mixed in each signal. The advantages are simple circuit, low cost, easy integration and easy fabrication into chips. The insufficiency is that it can only control the output amplitude of each channel, and cannot control the signal composition of each channel. The separation effect is not a true separation, but only a part of the weak signal is pressed, and the crosstalk cannot be truly eliminated.
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