Abstract: A circuit for preventing deterioration of the sound quality in a digital volume control circuit for use in a digital audio system is disclosed. The circuit includes a digital signal processing circuit for generating digital audio data of a given bit, a digital level controller for receiving a level control data from a system controller to therefrom combine the digital audio data with a control data determined according to an amount of the level attenuation of the digital audio data, at least one control signal detector for detecting only the control data from the output of the digital level controller, at least one digital-to-analog converter for converting the digital audio data from the output of the digital level controller into an analog audio signal, and at least one gain controller operably connected with the control signal detector for receiving the analog audio signal to control the gain of the analog audio signal in response to each state of the control data from the control signal detector.