An audio input device and a karaoke apparatus to detect user's motion and position, and an accompaniment method adopting the same. According to the audio input device and the karaoke apparatus, at least one of user's motion information and position information is detected and transmitted to the karaoke...http://www.google.com/patents/US20090023123?utm_source=gb-gplus-sharePatent US20090023123 - AUDIO INPUT DEVICE AND KARAOKE APPARATUS TO DETECT USER'S MOTION AND POSITION, AND ACCOMPANIMENT METHOD ADOPTING THE SAME
