Abstract: Heat generated from electronic equipment packed densely on a circuit board is transferred to conductive partition plates located adjacent to and on opposite sides of the circuit board. Heat is then transferred from the partition plates to conductive shelves located above and below the partition plates and then to a conductive rear wall of a cabinet. Heat is then transferred through the rear wall to a plurality of external fins and then to the atmosphere by radiation and convection. Alternatively, the circuit boards are housed in sealed enclosures. A clamp, fastened to the rear wall of the cabinet, is used for securing the sealed enclosure and for transferring the heat from the electronic equipment to the rear wall.

Abstract: A wideband amplifier utilizes predistortion components developed by an amplifying device (14) similar to the power amplifying device (15) to provide effective linearization for substantially reducing all of the intermodulation distortion products. Since the compensation is provided at the input to the power amplifier, the need for an output signal combiner is obviated so that the total power is available at the output. The efficiency is also enhanced since the predistortion amplifier (14) which operates from the input signal ony need be a voltage amplifier. An optional feedback circuit is disclosed which may be employed to reduce nonlinearities further if necessary.

Abstract: A tool for stripping insulation from coaxial or multiple conductor cables is disclosed. The tool consists of a support assembly (1) with an integrally connected spring (5) which swivels between an up and down position. The support assembly (1) contains a channel (2) which runs along its length where the spring (5) rests in its down position. A semicircular slot (4) receives the insulated cable. Embedded within support assembly (1) is a knife blade (7), a portion of which is exposed in the slot (4). The knife blade penetrates the insulation when the spring (5) is in its down position causing an incision through the insulation. A ring is placed at one end of the tool in which the user can insert a finger and thereby twirl the tool around to effect relative rotation of the tool and cable to cut through the cable over its entire circumference.

Abstract: There is disclosed a spelling correction arrangement for use in directory lookup applications. The arrangement corrects errors by finding the name in the directory that most closely resembles the name requested by the user. The arrangement is based on a recursive routine that continually subdivides the problem of finding a given name in a given directory into smaller subproblems in which shorter names are to be found in smaller directories. Multiple spelling errors are easily accommodated since the technique uses the given directory of names to limit the search. The technique allows the algorithm to find the closest name in the directory without actually considering the vast majority of the names that appear in the directory.

Abstract: In an MOS integrated circuit device, a multilayer polysilicon/metallic-silicide gate-level metallization structure is patterned to form gates and associated interconnects. Some of the interconnects are designed to make contact with ohmic regions in the single-crystalline body of the device. In accordance with a simplified fabrication procedure, a single implantation step is utilized to dope the metallic silicide while doping selected portions of the body. During a subsequent heating step, source, drain and ohmic contact regions are formed in the body. During the same step, the dopant in the metallic silicide diffuses into underlying layers of polysilicon and into body portions directly underlying polysilicon in amounts sufficient to render the polysilicon conductive and to form additional ohmic contact regions in the body.

Abstract: A DC power plant system has the operation of its individual rectifiers controlled by a stored program control system for the purpose of optimizing power efficiency. Load power requirements are compared with rated capacities of operating rectifiers of the system and individual rectifiers are turned on or off so that the plant efficiency is always maximized. Rectifiers are selected for turn on and off in the basis of their rated power capacity and their accumulated operating times.

Abstract: A clamping circuit comprises a first transistor having a first and a second resistor shunting the base-collector and base-emitter junctions, respectively, and a second transistor opposite in polarity to the first transistor which has its emitter connected to the base of the first transistor. Externally, the clamping circuit has a connection from the collector of the first transistor to a first voltage level terminal, from the emitter of the first transistor to a voltage output terminal, and from the base of the second transistor to a reference voltage terminal. A second voltage level terminal is provided to which portions of the circuit, including the emitter of the first transistor and the collector of the second transistor, are connected.

Abstract: A line circuit for use in coupling lines with an automatic call distributing switching system. The line circuit (1, 2) responds to a calling customer seizure of a line by connecting the seized line through the switching system (3) to attendant positions 34(P). Apparatus (100, 101, 102, 103) operable by an attendant position connected with the seized line releases the switching system connection and couples the seized line to an announcement circuit (49) to transmit attendant identified information over the seized line to the calling customer. If the calling customer does not disconnect from the announcement circuit after a predetermined time apparatus (104, 105) of the line circuit is enabled to initiate a call connection through the switching system and reconnect the seized line to the attendant positions.

Abstract: There is disclosed a combined business communication system and an ACD system where each station in the system is available to handle, on a per call basis, either ACD or regular incoming calls. The system is arranged to accept from any user at any station an ID uniquely associated with that user. The ID in turn then controls the ACD system to direct calls to the user in accordance with the ID information without regard to the station location of that user. Calls between system users are completed either in accordance with station identification numbers or in accordance with the ID number of the desired user.

Abstract: Single mode lasers are advantageously stabilized in order to prevent a side mode from growing to a level where partition noise effects degrade high speed performance. To obtain such spectral stability, the powers in the two adjacent side modes are measured, and the operating temperature of the laser varied in response to changes in their relative powers. Optimally, the gain curve peak is made to coincide with the preferred cavity mode.

Abstract: A voice-actuated switching system selectively connects multiple microphones to an audio line in accordance with the output signal levels from each of the microphones. The state of each microphone is determined by its use and can exit in one of three states: selected, mixed, or off. The microphone with the greatest output signal level at any given time is considered in the selected state and is selected for connecting to the audio line with no loss. Those microphones in the mixed state have their output signal levels attenuated before being connected to the audio line. And those microphones in the off state have their outputs essentially disconnected from the audio line. The user of a microphone while in the mixed state can be heard along with the user of a microphone while in the selected state although at a lower level.

Abstract: Metal ellipsoidal particles are deposited on an ordered array of silicon dioxide posts. Each of the particles has dimensions that are less than the wavelength of a fundamental beam to be used in the generation of second harmonic radiation. The rows of particles in the ordered array are spaced at a distance that is less than one-half of the fundamental wavelength and greater than one-half of the second harmonic wavelength.

Abstract: The present invention is a one-bit full adder circuit having a fast carry. The circuit may be implemented using integrated injection logic in which case the circuit comprises six NAND gates and two wired AND gates. Advantageously, there is only a single gate delay in the carry path.

Abstract: A simulated velocity match between a traveling optical wave and a traveling electrical modulating wave is obtained in traveling wave, velocity mismatched electrooptic devices by introducing, at longitudinally spaced intervals along the electrical signal wavepath, means for producing the equivalent of a 180 degree phase shift in the effect of the modulating signal upon the operative electrooptic parameter of said device. This technique is employed to minimize the effect of walk-off due to velocity mismatch in modulators, phase shifter and mode converters.

Abstract: The adaptive threshold circuit (FIG. 1) senses the amplitude of a digital signal relative to a threshold and generates a corresponding output signal therefrom. Feedback circuitry generates a correction signal which drives the threshold toward a predetermined level in the signal-eye pattern. This predetermined level passes only through the region of intersymbol interferene in the signal-eye pattern.

Abstract: In an ADPCM system, improved detection of silence intervals in a speech signal is attained by detecting the level of the logarithm step-size signal (d.sub.n), which is representative of the energy of the speech samples. A speech pattern is converted into a sequence of adaptive digital codes. Intervals of silence in the pattern are detected and a digital code representative of each silence interval is generated. The adaptive digital codes and the silence interval codes are combined to form a digitally coded signal representative of the pattern. The conversion of the pattern to adaptive digital codes includes forming a signal corresponding to the adaptation step-size for each digital code. The silence interval detection includes producing first and second threshold signals.

Abstract: Efficient transmission of light through a matrix isolation thin film is obtained despite the fact that the index configuration of the thin film is not appropriate for classical waveguides. The light is transmitted through the film approximately parallel to the substrate, thereby permitting analysis of the thin film, stimulation of reaction within the thin film, or use of the thin film as an optical memory.

Abstract: When a standard business office communication system is combined with ACD features, it is necessary to design the system to accommodate a variety of operational modes. Two such modes are handset operation, where a station user talks and listens via a conventional hand-held instrument, and headset operation where the user has an earphone and mouthpiece supported by the head. In headset operation, the station is made to appear off-hook permanently and incoming calls are signaled by a short burst of audio tone followed by an automatic connection to the called party. In handset operation, ringing signals must be applied to the station, and these signals continue until the incoming call is answered by a subsequent off-hook condition of the station. The disclosed arrangement allows each station to operate in either mode on a per call basis.