For instance, the TWEETER of a loudspeaker is shaped in the form of a fan for this purpose. Īs a result of their capability of diffraction, low frequency sounds are difficult to localize or contain in an environment (see CANYON EFFECT, DIFFUSE SOUND FIELD ).Īn acoustic radiator must be specially designed for good dispersion of high frequencies since this does not occur naturally through diffraction. The current invention maximizes the ability to produce acoustic benefits of reduced horn mouth and/or cabinet diffraction regardless of the cabinet or enclosure. Ĭompare: CANCELLATION, INTERFERENCE, PARABOLIC REFLECTOR, REFLECTION, REFRACTION. This work describes an approach to solve the three - dimensional Helmholtz equation for a piston radia - tor in a rectangular solid enclosure using the Method of Fundamental Solutions ( MFS ). Thus, diffraction may aid sound dispersion and DIFFUSION. In the low - frequency regime, traditional ap - proaches to diffraction modeling can produce errors that are not insignificant. We use specific terms for the resonances in any system. When the wavelength is similar to the dimensions of the object, as with low frequencies and buildings, or mid-range frequencies and the head, the wave diffracts around the object, using its edges as a focal point from which to generate a new wavefront of the same frequency but reduced intensity. These low frequency, long-wavelength sounds actually diffract around objects to a higher degree than other, higher-pitched sounds. There is a whole series of shorter-wavelength and higher-frequency sounds that resonate in the tube. Low frequency sounds have wavelengths that are much longer than most objects and barriers, and therefore such waves pass around them undisturbed. Such is the case with high frequencies with respect to the head, and thus is important in BINAURAL HEARING. High frequency sounds, with short wavelengths, do not diffract around most obstacles, but are absorbed or reflected instead, creating a SOUND SHADOW behind the object. The phenomenon in SOUND PROPAGATION whereby a SOUND WAVE moves around an object whose dimensions are smaller than or about equal to the WAVELENGTH of the sound.
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