Sound Source Model Research Articles

Directional characteristics of pulse sound source with spark discharge.

This paper proposes a new spark discharge pulse sound source model, and validity of the model is examined by comparison between the theoretically estimatedand experimentally obtained output pulse wave forms. This paper describes first the pulse spark discharge sound source model and an estimation method for directional dependency of the wave form. After a brief explanation of the pulse sound source structure, the experimentally obtained output pulse wave forms and directivity patterns are compared with the estimated ones and the good coincidence between them is shown. The model proposed in this paper explains well the experimental results.

Super-resolution acoustical passive imaging system using algebraic reconstruction

To obtain the fine structures of a wave field on a noise emitting object, a new super-resolution passive imaging system is constructed. The wave field detected by a hemispherically arranged microphone array corresponds directly to the wave field on the object by exploiting a priori information about the object’s physical structures. Thus resolution of one-tenth of a wavelength is realized. The principle, concrete construction, proposal of proper sound source models, and discussions on the effects of the measuring and additive noises are given, as well as several observed results.