By Paul. E Sabine
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Extra resources for Acoustics And Architecture
Here the difficulties of quantitative determination are almost insuperable. It is for this reason that progress in the scientific treatment of acoustical properties of rooms has been made by a method which, on its face, seems almost primitive, namely, the reverberation method, which will be considered in the next chapter. CHAPTER IV REVERBERATION (THEORETICAL) In Chap. Ill, we have noted that with a sustained source sound within an inclosure, there is set up an intensity pattern in which the intensity of the sound energy varies from point to point in a complicated manner and that in the absence of dissipative forces, the vibrational energy of the air within the inclosure tends to persist after the source has ceased.
M. may be considered as applying to the In other separate components of the complex sound. words, the propagation of a disturbance of any type in a in which the velocity is independent of the fre- medium take place as in the simple harmonic case The assumption of a plane wave, while simplifytreated. ing the mathematical treatment, does not alter the physical For a more general and a more rigorous mathepicture. quency will * matical treatment, standard treatises such as Lord RaySound" or Lamb's "Dynamic Theory leigh's "Theory of of Sound" should be consulted.
SUSTAINED SOUND IN AN INCLOSURE 41 tangular room, has not, to the writer's knowledge, yet been There are clearly two distinct problems: first, assuming that there is a sustained source of sound within the room, in which case the solution would depend upon the location of the source and the degree to which its motion is affected by the reaction of the resulting stationary wave on the source; and second, assuming that the stationary wave has been set up and the source then stopped. Stopping the source produces a sudden shift from one condition to the other, a fact which accounts for the frequently observed phenomenon of a sudden rise of intensity effected.
Acoustics And Architecture by Paul. E Sabine