Abstract: Voice compression is performed in multiple stages to increase the overall compression between the incoming analog voice signal and the resulting digitized voice signal over that which would be obtained if only a single stage of compression were to be used. A first type of compression is performed on a voice signal to produce an intermediate signal that is compressed with respect to the voice signal, and a second, different type of compression is performed on the intermediate signal to produce an output signal that is compressed still further. As a result, compression better than 1920 bits per second (and approaching 960 bits per second) are obtained without sacrificing the intelligibility of the subsequently reconstructed analog voice signal. Voice compression is also performed by recognizing redundant portions of said voice signal, such as silence, and replacing such redundant portions with a special code in said compressed signal.

Abstract: A portable apparatus for the treatment of injuries includes a first layer of flexible material and a second layer of flexible material coupled to the first layer of flexible material to form an inflation chamber. A third layer of flexible material is coupled to the first and second layers so that a space is formed between the second and third layers. The space formed between the second and third layers is in fluid communication with the inflation chamber at an outlet and the space between the second and third layers is formed so that a fluid channel extends from a first end of the space between the second and third layers to the outlet. A plurality of spacer members maintain the separation between the second and third layers so that the fluid channel remains unobstructed even when the apparatus is folded or wrapped around an injured area.

Abstract: An improved apparatus for the formation and production of cylindrical pressure vessels or tanks through metal spinning operations wherein the end caps of the vessels are simultaneously formed from a hollow, thin-walled cylindrical work tube rotatably supported within the apparatus. The arrangement is further designed to provide control of the distribution of the wall thickness as well as the profile of the end cap portion of the vessel so that the knuckle area may be of controlled thickness to increase durability and performance of the tank or vessel.

Abstract: In an epitrochoidal rotary air compressor, a stationary portion includes a stationary single offset power shaft on which is mounted an epitrochoidal rotor in a rotary housing portion. The rotor includes a pinion gear which cooperates with a ring gear in the rotary housing portion to move the rotor within the rotor chamber in the rotary housing portion. A centrifugally driven lubrication system including lubrication channels extending internally of the stationary power shaft is provided for lubricated bearings and gears within the apparatus. An improved compression seal engaging the lateral faces of the rotor has a plurality of buttons biasing a split ring against the lateral faces of the rotor. An air pressure unloader valve is centrifugally operated to release the load from the compressor during startup. A rotary after-cooler in the rotary housing portion removes thermal energy from the compressed air prior to leaving the compressor and an inter-cooler may be provided in a two stage compressor.

Abstract: A device and method for milling a trochoidal rotor having a predetermined trochoidal configuration. The trochoidal rotor is used in a trochoidal rotary device in which working chambers are defined between the rotor and a housing. The rotor device has inlet and outlet ports for passing a fluid or gas. The rotor is made by first planetating a rotor blank having a predetermined width and having an edge region about a predetermined axis. The cutting blade is provided which has a predetermined geometry and which is located at a predetermined fixed distance from the axis. The cutting blade is engaged with at least a portion of the edge region of the rotor blank. The cutting blade traverses the edge region of the rotor blank to cut the edge region into a predetermined trochoidal configuration. When the cutting blade is a helical flute, the engagement of the cutting blade with a portion of the edge region results in cutting at a predetermined location within the portion of the edge region.

Abstract: A swivel mount for the outlet conduit of a pressure vessel is disclosed that can be rotated to a desired position to provide access to a component attached to the mount without interrupting the flow of material from the pressure vessel to the mount and the component. The mount includes a hollow stem that is surrounded by and is in rotational sealing engagement with a sleeve. A sealed chamber is formed between the sleeve and the stem that receives material from the outlet conduit of the pressure vessel through a laterl aperture in the stem. The sleeve itself has at least one outlet conduit that is joined to the chamber and can direct material from the chamber to the component.

Abstract: An apparatus for pressurizing a fluid comprises a housing including a chamber and at least one vane positioned in the chamber and adapted to oscillate therein at any convenient speed to pressurize a fluid. A seal member is secured to the at least one vane for sealing between the at least one vane and the chamber. A propulsion apparatus is provided for oscillating the at least one vane and a counterweight device is operably secured to the propulsion apparatus. The counterweight device moves in opposition to the movement of the at least one vane to minimize the vibration produced in the housing by the oscillation of the at least one vane. A valve mechanism is secured to the housing and is in fluid communication with the chamber in the housing to control the movement of fluid into and out of the chamber.

Abstract: An outer envelope trochoidal device is provided. The device includes a rotor shaft and rotor assembly, the rotor assembly having a peripheral surface that defines a trochoidal curve and includes a first and a second rotor half. Each rotor half has a trochoidal profile surface and an inner circular surface. The rotor shaft includes secured thereto a cylindrical sleeve that includes a radial flange to which at least one of the rotor halves is secured. The rotor halves are secured to each other by counterbolt means extending laterally through the rotor halves. One rotor half can include a tapped hole in the outer peripheral surface of the rotor and a channel extending from the end of the tapped hole to the sleeve on the rotor shaft. A chamber is defined by a portion of the sleeve and a portion of the rotor half pinned to the sleeve, the chamber being in fluid communication with the channel.

Abstract: A rotor assembly for an outer envelope trochoidal device. The rotor assembly has an outer peripheral surface that defines a trochoidal curve and includes at least one tapped hole on one lobe. The tapped hole includes an adjustable balancing member for balancing the rotor assembly.