The relationships between measurement resolution and the accuracy of presented or predicted polar and frequency responses from single or arrayed loudspeakers are presented. Only direct loudspeaker- generated sound fields are addressed. Observations are made of current, commonly used measurement techniques, which can yield results with significant errors. The discussion includes the possible need to reconsider how loudspeakers should be measured, taking into account the increasing improvements in measuring equipment, data processing systems, and storage techniques.
Sound propagation modeling in acoustic horns at high levels is analyzed.
This model can predict the degree of nonlinear waveform distortion associated with propagation in the horn of large amplitude waves. The predicted output sound field can then be corrected for nonlinear distortion by appropriately predistorting the input signal, using the modeling-determined data. An automated genetic algorithm method determines discrete synthesis parameters for matching an arbitrary harmonic instrument tone. This work synthesizes the spectra of the trombone, English horn, and the Chinese pipa. This unique technique uses discrete summation matching, which requires less computer memory compared to wavetable matching.