By Yiteng Huang, Jacob Benesty
Audio sign Processing for Next-Generation Multimedia conversation structures provides state of the art electronic sign processing idea and implementation suggestions 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 replica. This book's concentration is sort of solely at the processing, transmission, and presentation of audio and acoustic indications in multimedia communications for telecollaboration the place immersive acoustics will play an excellent function within the close to future.
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Additional info for Audio Signal Processing for Next-Generation Multimedia Communication Systems
If the second-order design is constrained to standard first-order differential microphones, then it is not possible to reach the maximum directivity index and front-to-back ratio. The following section discusses how to implement an optimal design with respect to directivity index and front-to-back power rejection when using standard first-order microphone elements. Given a first-order differential microphone with the directivity function, where is a constant, it is of interest to know how to combine two of these microphones so that the directivity index is maximized.
20. Of course, an arbitrary combination of DI and F could also be maximized for some given optimality criterion if desired. 6 Maximum Second-Order Differential DI and F Using Common First-Order Differential Microphones. Another approach to the design of second-order differential microphones involves the combination of the outputs of two first-order differential microphones. Specifically, the combination is a subtraction of the first-order differential outputs after one is passed through a delay element.
5 dB. A derivation of the directivity pattern and the parameters that determine the second-order hypercardioid are contained in Section 3. The results are: These values correspond to the peaks in Fig. 15. Null locations for the secondorder hypercardioid are at 73° and 134°. 5 dB, which is the same for the first-order differential cardioid and first-order differential hypercardioid. A polar response is shown in Fig. 17(c). 4 Second-Order Supercardioid. The term second-order supercardioid designates an optimal design for the second-order differential microphone with respect to the front-to-back received power ratio.
Audio Signal Processing for Next-Generation Multimedia Communication Systems by Yiteng Huang, Jacob Benesty