By Yiteng Huang, Jacob Benesty
Audio sign Processing for Next-Generation Multimedia verbal exchange platforms offers state-of-the-art electronic sign processing thought and implementation thoughts 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 lifelike sound degree copy. This book's concentration is nearly solely at the processing, transmission, and presentation of audio and acoustic indications in multimedia communications for telecollaboration the place immersive acoustics will play an outstanding function within the close to future.
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Extra info for Audio Signal Processing for Next-Generation Multimedia Communication Systems
If it is now assumed that the spacing is much smaller than the acoustic wavelength, then As expected, the first-order array has the factor that resolves the component of the acoustic particle velocity along the microphone axis. By allowing the addition of time delay between these two subtracted zeroorder microphones, it is possible to realize general first-order directional responses. For a plane-wave incident on this new array where is equal to the delay applied to the signal from one microphone.
5 also show that there is relatively small difference between the optimal designs of differential arrays for the spherical and cylindrical isotropic noise fields. Typical differences between directional gains for either cylindrical or spherical isotropy assumptions are less than a few tenths of a dB; most likely an insignificant amount. Probably the most important detail to notice is that the rate of increase in the directional gain versus differential array order is much smaller for cylindrically isotropic fields.
OPTIMAL ARRAYS FOR ISOTROPIC FIELDS Acoustic reverberation in rooms has historically been modeled as spherically isotropic noise. A spherically isotropic noise field can be constructed by combining uncorrelated noises propagating in all directions with equal power. In room acoustics this modeled noise field is referred to as a “diffuse” sound field and has been the model used for many investigations into the statistical distributions of reverberant sound pressure fields. Although the standard to model for reverberant acoustic fields has been the “diffuse” field model (spherically isotropic noise), another noise field that is appropriate for room acoustics is cylindrical noise.