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주파수 영역에서의 적응 알고리즘을 이용한 디지털 보청기의 소음 제거에 관한 연구
황석윤(Seok-Yoon Hwang),최성규(Sung-Kyu Choi) 한국언어치료학회 2004 言語治療硏究 Vol.13 No.3
The study on noise deduction in hearing aids is one important critical factor for hearing impaired and people who are wearing the hearing aids. Therefore many researchers have interested on two microphone system to reduce noise in hearing environments. However, the two microphone system is limited to reduce noise when speech and noise are imput together to the microphone. The purpose of this study was to simulate the noise reduction effects in the frequency domain of digital hearing aids with adaptive algorithm. The results of this study were that: (a) the adaptive algorithm is perfect to reduce the noise in the back and side directions with two different azimuths; and (b) the adaptive algorithm is perfect to reduce the noises in the different back sides with two different azimuths. Therefore this study concluded that the adaptive algorithm in the frequency domain of digital hearing aids is effect to reduce noises in hearing environments. Also this study suggested that the adaptive algorithm is effect for most hearing impaired who are wearing only one hearing aids.
마이크로폰 배열에 의한 입체음 인식 보청기에 관한 연구
황석윤(Seok-Yoon Hwang),남인길(In-Gil Nam) 한국언어치료학회 2005 言語治療硏究 Vol.14 No.4
Hearing aids today use more and more sophisticated technology to adopt automatically to their environments such as multi-band compression, noise deduction with DSP, and microphone array. However it is difficult that the people with hearing loss feel the functions of the hearing aids are very similar with human ears. The uncomfortable reason in hearing aids may be due to noise problems. The roles of the human's two ears are to deduct the noise and to understand the sound sources. Most hearing impaired wear one hearing aids, not two. The cost of hearing aids may be the main reason why the people do not have two hearing aids. The purpose of this study is to simulate the microphone array effects with eye glasses to deduct of the noise and to understand the stereophonic sound. The results of this study are that : (a) the microphone array with eye glasses deduct the noise; and (b) the microphone array with eye glasses produce to understand the stereophonic sound. Therefore this study concluded that the microphone array is effect to reduce the sound noise and to produce the stereophonic sound.
두 개의 마이크로폰 배열 보청기의 간섭 신호 제거 기법에 관한 시뮬레이션 연구
황석윤(Seok-Yoon Hwang),최성규(Sung-Kyu Choi) 한국언어치료학회 2003 言語治療硏究 Vol.12 No.2
Speech production at one location in a class room should be clear and intelligible everywhere on the class room, but this may not always be achieved. The main negative affect in speech intelligibility in a class room is influenced by background noise. Therefore many researchers who are working for hearing aids study how to deduct the noise. The microphone is generally existed only one in the hearing aids. Recently the dual microphone system which other word is dual array system is developed to reduce the noise in sound environments. The purpose of this study is to simulate reduction of noise in one hearing aids with multi array system. The results of this study were that: (a) two microphone arrays is perfect to reduce the noises in the front sides with two different azimuths; (b) two microphone arrays is perfect to reduce the noises in the front side and back side with two different azimuths; and (c) two microphone arrays is perfect to reduce the noises in the two back sides with two different azimuths. Therefore this study concluded that the multi array system in one hearing aids is effective to reduce the noise in sound environments for the hearing impaired who were the hearing aids.
Fuzzy Subsystems of A Fuzzy Finite State Machine
Seok Yoon Hwang(황석윤),Ki-Hwan Kim(김기환) 한국지능시스템학회 2001 한국지능시스템학회논문지 Vol.11 No.2
In this paper we define fuzzy subsystems of a fuzzy finite state machine by using maps S<SUP>α</SUP> of each state subset to its all α-successors, which is a natural generalization of crisp submachines as fuzzy. And the corresponding concepts are also examined.
보청기의 마이크로폰 배열에 따른 소음제거 시뮬레인션 연구
황석윤(Seok-Yoon Hwang),최성규(Sung-Kyu Choi) 한국언어치료학회 2002 言語治療硏究 Vol.11 No.2
Noise is one of important negative factors to understand sounds in natural environments. Therefore the hearing impaired children who wear the hearing aids cannot understand sounds clearly in noise environments. The microphone is generally existed only one in the hearing aids. Recently the dual microphone system which other word is dual array system is developed to reduce the noise in sound environments. The purpose of this study is to simulate reduction of noise in hearing aids with multi array system. The results of this study are that: (a) the azimuth between the target sound and noise is important factor to reduce the noise; (b) linear array system is not perfect to reduce the noise according to the different azimuth; (c) the rectangle system in microphone array is effective to reduce the noise without the azimuth between target sounds and noise. Therefore this study concluded that the multi array system in hearing aids is effective to reduce the noise in sound environments for the hearing impaired who were the hearing aids.