Abstract: The herein described invention pinpoints the problem plaguing the high quality reproduction of which the overall compact disc system is inherently capable. A disc manufacturing problem has been cited in the invention resulting in playback inadequacies resulting from a combination of the playback compact disc player and compact disc design and manufacture. A simple method for correcting already purchased discs is described. Several options are available to the disc manufacturer. The listener of contemporary corrected compact disc recorded sound, played by a compact disc player, will hear with much greater detail, depth, and clarity as contrasted to listening to a like disc which does not have the correction applied to the disc.

Abstract: A pressure compensating container having a cavity and including an open end. A closure lid is provided for sealing the open end of the container. A pressure regulating device is operatively connected to the container for regulating the pressure within the cavity. The base portion and the lid portion are constructed of a microwave permeable material. A safety pressure relief valve is provided having a manually operated pressure relief button for relieving the pressure within said cavity of said pressure compensating container.

Abstract: A radar system transmitting a signal of given carrier frequency which is quency modulated at a given rate and wherein the nature of the target return is utilized to eliminate sea and ground clutter. The reflected signal from a hard target has a unique modulation imposed on it by the interference of the incident and reflected waves and this unique modulation is converted to the modulated voltage thereby permitting the use of a video amplifier having a narrow bandwidth.