난청인용 고출력 전화기 개발

Development of High Power Telephone for Hearing Impaired Person

We developed the high power telephone for hearing impaired person (HIP) who can't communicate with others by general telephone. The general telephone can't delivered enough sound for HIP to understand telephone speech. In this study, we developed the method of telephone speech amplification proper to HIP and effective howling suppression which occurred as a side effect of amplification. In our new telephone, speech sound is divieded to 3 band pass filter path, amplified respectively fit to HIP's hearing ability, and monitored howling in time domain. The result of test of our telephone showed that we can amplify the sound as much as 40dB, which is very useful to HIP, and make HIP increase the perception of telephone speech.