Novel Audio Amplifier and its Kansei Evaluation

抄録

This paper presents a completely new and simple audio amplifier system using the opto-coupling of LED (Light Emitting Diode) and PD (Photo Diode), without using conventional devices such as Transistor, IC and Vacuum Tube. This paper also describes the reason why the opt-coupling device works in the same way as a bipolar junction transistor and explains why the audio amplifier can be realized in a very simple form. Since we have felt that the presented audio amplifier shows good sound with very low noise, we have evaluated the characteristics of sound signal from the audio amplifier. As for the Kansei evaluation, we have obtained the experimental result that it varies depending on the type of songs (music). NAA is inferior CAA (Conventional Audio Amplifier) in some items. However, it was found to be comparable to the overall.