By Hector Perez Meana

Audio and speech processing have accomplished very important prestige in improvement within the final 3 a long time, bettering the traditional of dwelling of many folks. concerning those functions, numerous sign processing algorithms were constructed to help the speech impaired and enhance the training skill of youngsters. Advances in Audio and Speech sign Processing: applied sciences and functions presents a finished method of sign processing instruments in regards to the enhancement, attractiveness, and safety of speech and audio indications. Advances in Audio and Speech sign Processing: applied sciences and purposes deals researchers and practitioners the data they should improve and enforce effective sign processing algorithms within the enhancement box.

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1 0. 2 0. 3 0. 4 0. 5 0. 6 0. 7 0. 8 Normalized F requency (×p rad/s ample) 0. 9 1 50 0 -50 -100 0 0. 9 0. 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.

The parameter a controls the depth of the notches that occur at odd multiples of p/d. The chorus effect is the effect of generating same sounds at the same time but with small changes in the amplitudes and small timing differences. The small variations in the time delays and amplitude can be simulated by varying them slowly and randomly replacing the delay as follows: z−D → z− (n) , (33) where b(n) is a low frequency random signal. The technique entails the use of several variable delay lines connected in parallel as shown in Figure 27.

The ALT, which has the form of a handheld device, introduces an excitation in the vocal track by applying a vibration against the external walls of the neck. This excitation is then modulated by the movement of the oral cavity to produce the speech sound. This transducer is attached to the speaker’s neck, and in some cases in the speaker’s cheeks. The ALT is widely recommended by voice rehabilitation physicians because it is very easy to use, even for new patients, although the voice produced by these transducers is unnatural and with low quality, and besides that it is distorted by the ALT produced background noise.

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