Document camera, video and audio output system, and video and audio output method

摘要

A document camera includes: a camera unit which acquires a video signal; a microphone unit which acquires an audio signal; a stamp adding unit which adds a time stamp for synchronizing the video signal and the audio signal with each other to the video signal and the audio signal that are acquired; a mode switching button which switches between a “video recording mode” and a “sound reinforcement mode”; a video recording unit which records the video signal and the audio signal together with the time stamp if the “video recording mode” is switched on; and a sound reinforcement instruction unit which instructs a projector to output the video signal and the audio signal, ignoring the time stamp, if the “sound reinforcement mode” is switched on.