Download Audio Signal Processing for Next-Generation Multimedia by Yiteng Huang, Jacob Benesty PDF

By Yiteng Huang, Jacob Benesty

Audio sign Processing for Next-Generation Multimedia communique platforms offers state-of-the-art electronic sign processing thought and implementation options for difficulties together with speech acquisition and enhancement utilizing microphone arrays, new adaptive filtering algorithms, multichannel acoustic echo cancellation, sound resource monitoring and separation, audio coding, and practical sound level copy. This book's concentration is sort of completely at the processing, transmission, and presentation of audio and acoustic signs in multimedia communications for telecollaboration the place immersive acoustics will play a very good function within the close to future.

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One obvious conclusion that can be drawn from the above result is that the rate of increase in directivity factor as a function of the number of microphones is much slower for a cylindrically isotropic field than a spherically isotropic field. A plot comparing the maximum gain for microphone arrays containing up to ten elements for both spherically and cylindrically isotropic fields is shown in Fig. 6. There are two main trends that can easily be seen in Fig. 6. First, the gain in directivity index decreases as the number of elements (order) is increase.

The extension to higher orders is straightforward and is developed in later sections. Most of the arrays that are described in this chapter have directional characteristics that are optimal in some way; namely, the arrays are optimal with respect to one of the performance measures previously discussed: directivity index, front-toback ratio, sidelobe threshold, and beamwidth. 6 at the end of this section. 1 Audio Signal Processing FIRST-ORDER DESIGNS Before actual first-order differential designs are discussed it is instructive to first examine the effects of the parameter on the directivity index DI, the front-to-back ratio F, and the beamwidth of the microphone.

29). Both figures are plotted for values of and between –1 and +1. 5 dB. The two peaks in the plot represent the same maximum and only the order of the product of first-order sections used to represent the second-order response has changed. 0 dB; the contours are in 1 dB steps. 1 Second-Order Dipole. 17(a) shows the polar magnitude response for this array. 0 dB, and by symmetry the front-to-back ratio is 0 dB. The 3 dB beamwidth is 65°. 2 Second-Order Cardioid. 29) can be a cardioid. 9 dB. A more general form for a second-order array can be written as the product of a first-order array with that of a first-order cardioid.

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