In these days, With the remarkable development of information and telecommunication technology today,
it is easy to transfer information through portable information devices. When using mobile devices to
transmit information, they are placed in various noisy environments. The noise environment is an
environment that interrupts the sound of information by using electronic portable devices. In this case, the
signal to noise ratio (SNR) can be obtained by comparing the magnitude of the signal generated by the
information device with the magnitude of the noise. In previous studies, it has shown that the minimum
SNR required for information transmission is 15 dB. Also in previous studies, we analyze the magnitude
and type of environmental noise when using mobile devices has been it. In a quiet environment, the
average noise level is less than 50 dB. The average of noisy environments is around 80 dB. This noise
occurs the hearing loss. And when using a portable information communication device, the sound generated
from the device easily becomes 100dB. A sound of 100dB is a very dangerous sound that harms human
hearing. In this study, we propose a method to improve the sound quality by analyzing the size and
characteristics of sound when transmitting sound through finger vibration.