Application of adaptive digital signal processing （自适应数字信号处理中的应用）.pdfVIP

Veterans Administration Journal of Rehabilitation Research and Development Vol . 24 No . 4 Pages 65--74 Application of adaptive digital signal processing speech enhancement for the hearing impaired DOUGLAS M . CHABRIES, RICHARD W . CHRISTIANSEN, ROBERT H . BREY, MARTIN S. ROBINETTE, and RICHARD W . HARRIS* Brigham Young University, Provo, Utah and Mayo Clinic Audiology Department, Rochester, Minn( sotc Abstract--A major complaint of individuals with normal problem are described, including signal processing tech- hearing and hearing impairments is a reduced ability to niques that offer promise in the noise suppression appli- understand speech in a noisy environment . This paper cation. describes the concept of adaptive noise cancelling for removing noise from corrupted speech signals . Applica- tion of adaptive digital signal processing has long been INTRO?DUCTION known and is described from a historical as well as technical perspective . The Widrow-Hoff LMS (least mean Hearing impairment is not only the most prevalent square) algorithm developed in 1959 forms the introduc- communicative disorder, it is also the number one tion to modern adaptive signal processing . This method chronic disability affecting people in the United uses a primary input which consists of the desired States . A major complaint of those with hearing speech signal corrupted with noise and a second ref- impairments is a reduced ability to understand speech erence signal which is used to estimate the primary in everyday communication in a noisy environment. noise signal . By subtracting the adaptively filtered esti- mate