An audio mixing device includes a gain setting circuit configured to set first to n-th gains based on a command input from the outside, n being an integer of two or more, and a mixing circuit configured to output a mixing signal obtained by mixing two or more of first to n-th multiplication data obtained by respectively multiplying first to n-th audio data by the first to n-th gains. In a case where the j-th gain of the first to n-th gains is set to a first value, when the j-th gain is to be set to a second value different from the first value, the gain setting circuit transitions the j-th gain from the first value to the second value in a stepwise manner in a j-th gain change section of first to n-th gain change sections.

An audio mixing device includes a gain setting circuit configured to set first to n-th gains based on a command input from the outside, n being an integer of two or more, and a mixing circuit configured to output a mixing signal obtained by mixing two or more of first to n-th multiplication data obtained by respectively multiplying first to n-th audio data by the first to n-th gains. In a case where the j-th gain of the first to n-th gains is set to a first value, when the j-th gain is to be set to a second value different from the first value, the gain setting circuit transitions the j-th gain from the first value to the second value in a stepwise manner in a j-th gain change section of first to n-th gain change sections.

A voltage gain control circuit comprising: a current-to-current conversion circuit comprising; a first current mirror transistor; a second current mirror transistor; and a current mirror transistor, the voltage gain control circuit further comprising and a current-to-voltage conversion circuit, wherein an input of the current-to-voltage conversion circuit is coupled to an output of the current-to-current conversion circuit and wherein the current-to-voltage conversion circuit is configured to provide an output voltage signal which varies proportionately to a signal received at the input of the current-to-voltage conversion circuit, and wherein the configuration of the current-to-current conversion circuit is such that a linear current variation in the received linear control current results in an exponential current variation in an output current of the current-to-current conversion circuit provided to the current-to-voltage circuit via the second CMT input terminal.