Abstract: An improved system for acoustic enclosures, which greatly enhances sound reproduction, with improved frequency response, reduction in harmonics-induced distortion, improved conversion of electrical to acoustical energy increased purity of sound due to better phase response among its other qualities. The acoustic principles utilized at those of the resonating air column, the horn-type form, and the multiport. A horn-shaped multiport comprised of a number of smaller ports is used to modify the resonating air column to produce the exponential multi-ported acoustic enclosure.

Abstract: A system and method of recording and reproducing wide band channel information by means of several narrow band channels involves sampling of wide band channel information, providing respective samples to corresponding narrow band channels wherein recording and reproduction take place, reproducing the narrow band signals, amplifying and shaping the reproduced narrow band signals, and then combining and amplifying the resulting narrow band signals to reproduce the original wide band signal. A preferred embodiment of the present invention involves dot interlacing the received wide band information signals in accordance with a derived sync signal to derive sample pulse outputs. Various embodiments are provided for shaping the reproduced narrow band channel signals in accordance with "phase modulation", "amplitude modulation", and "frequency modulation" modes of operation.