Fractional delay based on Lagrange interpolation and analysis of parameter mismatch in cochlear implant(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2021年第4期
- Page:
- 468-471
- Research Field:
- 医学信号处理与医学仪器
- Publishing date:
Info
- Title:
- Fractional delay based on Lagrange interpolation and analysis of parameter mismatch in cochlear implant
- Author(s):
- ZHANG Chunxiao; CHEN Yousheng; HUANG Hongzhan
- Shenzhen Institute of Information Technology, Shenzhen 518000, China
- Keywords:
- Keywords: Lagrange interpolation cochlear implant fractional delay parameter mismatch
- PACS:
- TH776； R318
- DOI:
- DOI:10.3969/j.issn.1005-202X.2021.04.014
- Abstract:
- Abstract: Beamforming is one of the most important methods for speech enhancement at cochlear implant front end, and the main parameters of this method include gain coefficient and delay parameter. Due to the small size of cochlear implant, there will be the problem of fractional delay in the traditional beamforming method. Herein Lagrange polynomial interpolation is used for realizing the fractional delay parameters of cochlear implant, and the fractional delay signal sequence is formed by weighting the values of adjacent points. The simulation results show that the fractional delay method based on Lagrange polynomial interpolation can not only achieve the high coincidence of amplitude frequency response and phase frequency response in low-frequency band, which is consistent with the characteristics of cochlear implant frequency band, but also realize the low error and low computational complexity of fractional delay in cochlear implant frequency band.
Last Update: 2021-04-29