![]() ![]() A sound disturbance is created that looks like a spherical wavefront propagating away from the loudspeaker center. Imagine a non vibrating loudspeaker diaphragm that moves suddenly for a very short period of time. Loudspeaker drivers emit sound waves in a spherical sense to a good degree of accuracy. So what exactly is 'baffle diffraction step' and how is it associated with sound diffraction effect ?Ī straightforward answer can not be attempted before one understands how diffraction works for sound waves propagating away from a loudspeaker driver flushed on an ordinary speaker front baffle. Generally speaking high frequency sounds diffract weakly. On the other hand only a small part of the energy (and pressure level) of high frequency sounds enters the shadow zone of obstacles. Low frequencies bent around objects without much attenuation. The energy of diffracted waves is strongly frequency dependent. We say that a sound wave 'diffracts' around the edges of an object and by that we mean that it bents around the object's boundaries and propagates in the 'shadow' zone even with a substantially attenuated pressure level. A completely silent shadow zone would be formed behind objects in the same way it is formed for visible light within an ordinary house.Īn almost closed door leaving only a small slit would let the sound waves enter the room in a "straight line" sense, "illuminating" only a small portion of its volume. If diffraction did not exist sound waves would not propagate behind obstacles. ![]() In general diffraction is a phenomenon associated with a wave propagating not in a straight line. Our approach will be kept as simple as possible and at the same be directed to all those practical implications that affect speaker design procedures. There are several articles in the web explaining what Baffle Diffraction Step is and how it is integrated in loudspeaker SPL responses. Details LOUDSPEAKER PHYSICS: PART 6,BAFFLE DIFFRACTION STEP ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |