Dual channels noise cancelling system

Author

Zhaoli, Yan ; Du Limin ; Ji, Feng ; Lingyun, Xie ; Jun, Fu

Author_Institution

Inst. of Phys., Acad. Sinica, Beijing, China

fYear

2001

fDate

2001

Firstpage

445

Lastpage

448

Abstract

To realize speaker-free speech recognition with DSP, a 2-channel recording system was developed and used to set up a speech library. The filters, including a high-pass filter, an LMS adaptive filter and a combination of these two, were adopted to separate a speaker´s voice from a noisy background. The noise cancellation effectiveness of these filters was evaluated. It is worth noting that 1/f noise is shown to be a very important factor for the effectiveness of an adaptive filter. After the prior cancellation of 1/f noise at frequencies lower than 1 Hz in this study, the output signal of an adaptive filter can be improved significantly. This is of value not only for speech processing systems, but also for other adaptive filter systems

Keywords

1/f noise; adaptive filters; digital signal processing chips; high-pass filters; speech recognition; DSP; adaptive filter; dual channel noise cancelling system; filters; noisy background; output signal; speaker voice; speaker-free speech recognition; speech library; speech processing systems; Acoustic noise; Adaptive filters; Background noise; Libraries; Microphones; Noise cancellation; Speech enhancement; Speech processing; Speech recognition; Working environment noise;

fLanguage

English

Publisher

ieee

Conference_Titel

Intelligent Multimedia, Video and Speech Processing, 2001. Proceedings of 2001 International Symposium on

Conference_Location

Hong Kong

Print_ISBN

962-85766-2-3

Type

conf

DOI

10.1109/ISIMP.2001.925429

Filename

925429