Digital signal processing (2nd ed.): principles, algorithms, and applications
Digital signal processing (2nd ed.): principles, algorithms, and applications
Adaptive filter theory (3rd ed.)
Adaptive filter theory (3rd ed.)
Speech enhancement using sub-band adaptive Griffiths--Jim signal processing
Speech Communication - Special issue on speech processing for hearing aids
An integrated real-time beamforming and postfiltering system for nonstationary noise environments
EURASIP Journal on Applied Signal Processing
Frequency-domain adaptation of causal digital filters
IEEE Transactions on Signal Processing
Signal enhancement using beamforming and nonstationarity withapplications to speech
IEEE Transactions on Signal Processing
IEEE Transactions on Consumer Electronics
Hi-index | 0.01 |
This paper introduces the kepstrum method of identification of acoustic transfer functions and its real-time application in techniques such as speech enhancement and noise cancellation. By using kepstrum (known elsewhere as complex cepstrum) analysis, we will show that the kepstrum method is reliable and applicable to real-time processing by providing an efficient kepstrum processing technique with a fast processing time using fast Fourier-transforms (FFTs). Furthermore, it will be shown that its application to speech enhancement methods gives several favourable effects such as: (1) application flexibility by enabling invertibility, which gives a stable minimum phase transfer function on application of the inverse of a room impulse response, (2) processing robustness by using it as building blocks and (3) computational simplicity by highly reduced weights in an adaptive algorithm when it is used with a cascaded adaptive filter. Accordingly, we will show that the kepstrum approach contributes to speech enhancement and noise cancellation with an improved performance in signal-to-noise ratio (SNR) by using only two microphones with a small physical dimension in size. Experiments on a 20cm broadside two-microphone acoustic beamformer configuration are implemented in real-time in an indoor office.