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Download Advances in Audio and Speech Signal Processing: Technologies by Hector Perez Meana PDF

By Hector Perez Meana

Audio and speech processing have accomplished vital prestige in improvement within the final 3 a long time, bettering the normal of residing of many folks. relating to those purposes, a number of sign processing algorithms were constructed to help the speech impaired and increase the educational skill of youngsters. Advances in Audio and Speech sign Processing: applied sciences and purposes offers a entire procedure of sign processing instruments concerning the enhancement, acceptance, and safety of speech and audio signs. Advances in Audio and Speech sign Processing: applied sciences and purposes bargains researchers and practitioners the knowledge they should advance and enforce effective sign processing algorithms within the enhancement box.

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Is prohibited. TEAM LinG  Jovanovc Dolecek & Fernandez Vazquez Figure 5. Speech signal with added noise P ower S pectral Dens ity E s timate via W elch S ignal + nois e -20 5 4 -30 P ower/frequency (dB /Hz ) 3 Amplitude 2 1 0 -1 -2 -40 -50 -60 -70 -3 -4 0 500 1000 1500 2000 2500 Time 3000 3500 4000 4500 -80 0 (a) Time domain 0. 5 1 1. 5 2 F requency [kHz ] 2. 5 3 3. 2 to get the signal: xx = x + noise, (5) which is shown in Figure 5(a). Its power spectral density is shown in Figure 5(b). Notice that the power spectral density has two peaks corresponding to the frequencies of the noise.

2 0. 3 0. 4 0. 5 0. 6 0. 7 0. 9, we investigate the effect of varying delay on the echo signal, by considering D equal to 500, 2000, 4000, and 6000. The resulting echo signals are shown in Figure 10. Instead of adding the echo, we can subtract it to obtain: y (n) = x(n) − ax(n − D). (11) From Equation (11) the corresponding system function of the filter is: H ( z ) = 1 − az − D, (12) Copyright © 2007, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc.

Is prohibited. TEAM LinG Dgtal Flters for Dgtal Audo Effects  Here we present methods for generating different sound effects using appropriate digital filters. In order to better understand the process of generating sound effects, the filters are described in both the time and the transform domain using Fourier and z-transform. Filters are designed using MATLAB, and the corresponding effects are illustrated on the speech signal. The rest of the chapter is organized as follows. The next section introduces the speech signal used to illustrate different sound effects.

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