Abstract: An RF device (12), such as an amplifier, is tested by applying a digitally-modulated RF stimulus signal, having a known magnitude and phase angle, to the device to cause it to generate a response signal. The response signal of the device is down-converted and digitized prior to establishing its magnitude and phase angle. The magnitude and phase angle of the digitized, down-converted response signal are compared to the magnitude and phase angle, respectively, of the digitally-modulated stimulus signal to yield transfer functions indicative of the operation of the device.

Abstract: The present invention is a storage and retrieval system for JPEG images. In one illustrative embodiment the system includes an apparatus for storing a JPEG image in or on a storage medium with unequal error protection, comprising a separator for separating the JPEG image into Type-I and Type-II information, an error correction encoder for encoding the Type-I information with more error protection than the Type-II information, and a storage recorder for recording the encoded Type-I and Type-II information in or on the storage medium. The system further includes an apparatus for reading the encoded Type-I and Type-II information from the storage medium.

Abstract: The present invention provides a high impedance optical receiver circuit for use in integrated circuits. The receiver circuit consists of an optical detecting device connected to the gate of an FET device and further connected to a diode providing a load impedance. The FET device is connected to a biasing voltage through a biasing resistive element and to a conditioning stage output. The use of a diode to provide a load impedance allows for a smaller and easier to manufacture receiver circuit than would be possible using either a load resistor or a load FET. According to one aspect of the present invention, a digital integrated circuit employing SEED technology incorporates a plurality of diode-loaded receiver in an array of optical receiver circuits to reduce the footprint of the overall SEED circuit array.

Abstract: A system and method for generating a signal having a reliable, fixed duration and/or delay as a function of relative, not absolute, device characteristics. That is to say, the time period of the generated signal is determined as a ratio of one device's operating characteristics to another device's operating characteristics. In particular, the invention provides a fixed time signal as a function of the relative values of two capacitive elements that have a known ratio of capacitance with respect to each other. The invention is particularly useful when implemented upon an integrated circuit, as standard fabrication techniques for such circuits allow relative device characteristics to be held to relatively tight tolerances.

Abstract: A filter synthesizer and method are disclosed for generating and outputting a stable filter from frequency response data, including coherence values. A processing unit has a processor, memory, and stored programs. The processor, operating the modal analysis program, processes the frequency response data, generates orthogonal polynomial data from a cost function of the frequency response data including coherence values, and generates the modal parameters of a transfer function from the orthogonal polynomial data, which represents Forsythe polynomials. The processor generates the orthogonal polynomial data from least squares processing the cost function of the frequency response data, including coherence values. The processor generates the modal parameters, including a pole of the transfer function, and determines an instability condition from the pole. If a pole is unstable, the processor refits the frequency response data to generate a stable transfer function.

Abstract: The disclosed method of making a glass body by a sol/gel process comprises electrochemically assisted release of the gel body from the mold in which the body was formed. More specifically, the method involves gelation of a sol in a mold that comprises a first conductor member, with a second conductor member also being in contact with the sol and/or gel, and causing the flow of a current between the first and second conductor members, with the first member being the cathode. In consequence of the current flow a substantially liquid lubricating layer that facilitates removal of the gel body from the melt exists at the cathode/gel interface.

Abstract: In accordance with the invention, a plurality of elongated refractory bodies are laminated together by placing the bodies in close adjacency, exposing the adjacent bodies to a plasma torch heat source, and moving the bodies longitudinal past the torch at a nonzero average rate which includes a reciprocating (e.g., oscillatory) component to longitudinally spread the zone of heating. Where the bodies are a rod to be laminated within a hollow tube, it is advantageous to reduce the air pressure between the rod and tube, thereby eliminating potential contaminants and, at the same time, biasing the tube to collapse against the rod. This method is particularly useful in laminating overcladding tubes to core rods to form optical fiber preforms.

Abstract: A system pattern-based speech recognition, e.g., a hidden Markov model (HMM) based speech recognizer using Viterbi scoring. The principle of minimum recognition error rate is applied by the present invention using discriminative training. Various issues related to the special structure of HMMs are presented. Parameter update expressions for HMMs are provided.

Abstract: An integrated semiconductor device is formed by bonding the conductors of one fabricated semiconductor device having a substrate to the conductors on another fabricated semiconductor device having a substrate, flowing an etch-resist in the form of an uncured cement (e.g. epoxy) between the devices, allowing the etch-resist to solidify, and removing the substrate from one of the semiconductor devices. Preferably the etch-resist epoxy is retained to impart mechanical strength to the device. More specifically, a hybrid semiconductor device is formed by bonding the conductors of one or more GaAs/AlGaAs multiple quantum well modulators to conductors on an IC chip, wicking an uncured epoxy between the modulators and the chip, allowing the epoxy to cure, and removing the substrate from the modulator.

Abstract: A method and apparatus for cleaning substrates in a process for device fabrication is disclosed. An aqueous solution of hydrogen peroxide and ammonium hydroxide is used to clean the substrates. The concentration of hydrogen peroxide and ammonium hydroxide in the cleaning solution is maintained at a certain level. The life of the cleaning solution is extended by the process. By maintaining the concentrations of the hydrogen peroxide and ammonium hydroxide in the solution within a desired range, the process also provides a cleaning solution that effectively cleans the substates throughout the entire time the solution is used to clean the substrates. The apparatus monitors certain solution parameters such as the pH and the conductivity of the cleaning solution and adds hydrogen peroxide and/or ammonium hydroxide to the cleaning solution to maintain the parameters, and thus the concentration of hydrogen peroxide and ammonium hydroxide, at desired levels.

Abstract: The disclosed facility type determination technique ascertains whether or not a facility connection is solely digital. In the disclosed embodiments, this information is used to establish the rate at which data is coupled through the facility connection. More specifically, a predetermined test signal including a pseudorandom sequence of digital signals is transmitted through the facility or combination of facilities connecting a data source to a data destination after the connection between the source and destination is established. The received test signal is examined at the destination and the examination results are used to determine the rate at which data is subsequently transmitted between the data source and data destination. Advantageously, this technique does not restrict network facility management and can be employed in a variety of data communication applications.

Abstract: An optical integrated circuit provides a 1.times.2 power splitting function for a communication system and additionally provides at least one type of upgrade capability for the system. The upgrade capability may be remote optical time domain reflectometry (OTDR) testing at an out-of-band wavelength. The OTDR testing is performed around a power splitter whereby a fault may be precisely located on an output line past the power splitter. Other upgrade capabilities that an optical integrated circuit may provide are the ability to add optical network units (ONUs) to the communication at a later time or to increase the bandwidth without requiring any new cables between a central office and the optical circuit. The optical integrated circuits can provide these upgraded capabilities with a higher reliability than circuits which are manufactured with discrete components and at a lower cost.

Abstract: A duplex connector 300 is constructed by joining together a pair of simplex connectors 10 --10 using one or more plastic clips 210. Each simplex connector includes a latch 120 for interlocking it with a jack receptacle 40, and each simplex connector includes a pair of pin-receiving holes 103-104, 163-164 on its opposite side surfaces. Each clip includes a first planar structure 211 having a pair of cylindrical pins 203-204, 263-264, having different diameters, in each of two different regions that are press-fit into the pair of simplex connectors. In one configuration, a single clip 210 is used to join the pair of simplex connectors together, side-by-side, to form a horizontally stacked duplex connector 300. In this configuration, a second planar structure 212 is pivotally attached to the top edge 214 of the first structure to prevent snagging, and to enable the user to manually deflect both latches 120--120 simultaneously.

Abstract: A system that allows a calling party to quickly select a call coverage system to be utilized if a call is unanswered. The calling party can preselect the call coverage before the call is placed, and the called telephone terminal automatically transfers the call to the selected call coverage service if the called party does not answer. Alternatively, the called telephone terminal transmits back the available call coverage options if the incoming call is not answered. In response, the calling telephone terminal displays the available call coverage options to the caller, and the caller selects the call coverage option desired. The calling telephone terminal then transmits the selected call coverage option to the called telephone terminal which transfers the call to the selected call coverage service.

Abstract: A system which is a combination of editor, window system, shell, and user interface and which provides a novel environment for the construction of textual applications such as browsers, debuggers, mailers, and so on. The system combines an extremely lean user interface with some automatic heuristics and defaults to achieve significant effects with minimal mouse and keyboard activity. The user interface is driven by a file-oriented programming interface that may be controlled from programs or even shell scripts. By taking care of user interface issues in a central utility, the system further simplifies the job of programming applications that make use of a bitmap display and mouse.

Abstract: Reservoir cavities have been used successfully to achieve proper mold filling of large area substrate packages with severe leading and lagging of flow fronts in the cavity halves, The additional plastic required to fill the reservoir cavities and the additional work in removing the reservoir culls is minimal, Reservoir cavities have been shown to eliminate void problems in molded packages with large printed wiring board substrates,

Abstract: An automatic telephonic antenna mechanism for a radiotelephone handset having a body and a mouthpiece hinged thereto comprises a tubular antenna channel fastened to the body, an antenna plunger slidably installed within a first end of the channel, and a flexible connector slidably installed within a second end of the channel. The flexible connector has a first end connected to the antenna plunger via a dielectric coupler and a second end fastened to the hinged mouthpiece. The mouthpiece is rotatable about the hinge between open and closed positions, whereby movement of the second end of the flexible connector operates to extend and retract the antenna plunger.

Abstract: The present invention provides a dielectric optical fiber cable which is capable of being remotely detected while buried. Specifically, this invention incorporates magnetic materials into a layer of epoxy to from a distinct layer within the sheath system of a communications cable. The magnetic particles generate a detection signal which is distinguishable from that generated by a solid metallic pipe and does not adversely affect the operation of existing components of the cable nor does the incorporation of the magnetic marker layer of the present invention unduly limit the speeds at which the overall cable can be manufactured.