Patent ID: 8004609

Claim:
An amplifier to which at least an audio signal associated with a video signal is input and which reproduces the inputted audio signal, comprising: an audio processing portion that executes a reproducing process of the inputted audio signal; a test video generating portion that generates a test video signal and transmits the test video signal to a video display device; a sensing portion that senses a change in test video, which is generated based on the test video signal and displayed on the video display device; and a controlling portion that senses a time required from when the test video generating portion generates the test video signal until the sensing portion senses a change in a video being displayed on the video display device as a delay time of the video, and delays a reproduction of the audio signal based on the sensed delay time of the video, wherein the controlling portion calculates an audio delay time, which is a time to delay the reproduction of the audio signal, based on the delay time of the video, and sets the audio delay time in the audio processing portion; the audio processing portion senses a type of the audio signal; the controlling portion has a memory portion which stores the audio delay time for every type of the audio signal; and the controlling portion reads a corresponding audio delay time stored in the memory portion based on the type of the audio signal, and sets the audio delay time in the audio processing portion.