Abstract
This paper concerns the improvement of ear-plug type earphones performance. The transmission characteristics of the ear canal with/without earphones are different. Therefore, the sound quality of the earphone is a little poor compared with audio speaker. In addition, it is well-known that the acoustical characteristics of ear canal are individually different with each listener. Then, we predict the acoustical characteristics of ear canal with ear-plug type earphones by using transfer matrix method and study on how to improve the transmission characteristics of the ear canal. In this paper, a method for adjusting the resonance characteristic of the ear canal with earphones to the characteristic of the ear canal of AV speakers without earphones using digital filtering technique is proposed. In the method, the sound improvement reproduction performance is verified on the basis of experiments.
