Abstract: A liquid crystal display device includes a liquid crystal panel, a backlight, a luminance control instruction receiving component, an inverter circuit, a backlight control component and an image quality adjustment component. The liquid crystal panel displays an image. The backlight emits light to the liquid crystal panel. The luminance control instruction receiving component receives a luminance control instruction to control a luminance of the liquid crystal display device. The inverter circuit controls the light of the backlight. The backlight control component sets a backlight control amount for controlling the inverter circuit within a specific range based on the luminance control instruction when the luminance control instruction receiving component receives the luminance control instruction.

Abstract: A ROM 51 stores a plurality of volume set values and a plurality of level change rates corresponding to each other and an IC 5 accepts a volume set value specified by a user when carrying out volume setting. Moreover, it is decided whether a reproducing object is a CD or a DVD depending on a decision signal output from a loader section 1. A level change rate corresponding to the volume set value is output to an IC 2 if the reproducing object is the DVD, and the level change rate corresponding to the volume set value is adjusted at a predetermined adjusting rate and the level change rate thus adjusted is output to the IC 2 if the reproducing object is the CD. The IC 2 changes the level of an analog signal indicative of a voice input from the loader section 1 at the level change rate and outputs the signal to an amplifying circuit 3.

Abstract: A ROM 51 stores a plurality of volume set values and a plurality of level change rates corresponding to each other and an IC 5 accepts a volume set value specified by a user when carrying out volume setting. Moreover, it is decided whether a reproducing object is a CD or a DVD depending on a decision signal output from a loader section 1. A level change rate corresponding to the volume set value is output to an IC 2 if the reproducing object is the DVD, and the level change rate corresponding to the volume set value is adjusted at a predetermined adjusting rate and the level change rate thus adjusted is output to the IC 2 if the reproducing object is the CD. The IC 2 changes the level of an analog signal indicative of a voice input from the loader section 1 at the level change rate and outputs the signal to an amplifying circuit 3.