Abstract: An improved narrowband continuous phase modulation system incorporates a filtering mechanism in the transmitter and receiver sites that enables the radiated spectrum characteristic to have a substantially reduced response at frequencies other than the channel of interest and thereby achieve a significant reduction in unwanted adjacent channel interference. Each of the transmitter and receiver sites contains a square root Nyquist filter upstream and downstream of the modulator and demodulator, respectively. The output of the Nyquist filter in the receiver is coupled to an accumulator which sums successive samples of the demodulated data signals (including noise). The noise is reduced as a consequence of its inherent negative correlation properties (utilized in the accumulation of successive samples of the recovered signal).

Abstract: An ion mobility spectrometer, ionization detector and mass spectrometer is described having a reaction region, and means for introducing a sample gas, liquid or solid samples into the reaction region and an electrolyte in the reaction region of an alkali salt heated to a predetermined temperature, such as room temperature to 1000.degree. C., to provide a chemical reaction between the alkali atoms, cations or complement anions with the sample to provide product ions. The invention provides a non-radioactive ionization source and provides a means for ionization of a broad class of compounds.

Abstract: An electrochemical gas sensor is described incorporating a sensing electrode, a reference electrode, a solid matrix containing an alkali salt, a potentiostat and a heater. The invention overcomes the problem of a liquid electrolyte which may operate over limited environmental conditions.

Abstract: A printer includes a light source, a film carrier and a print paper support. A lens turret is mounted between the film carrier and the print paper support and is rotatable about a rotational axis. The lens turret is transversely movable with respect to the path of movement of the print paper whereby an image projected through the film and the lens is transversely movable across the print paper. The lens turret has a plurality of individual lenses for making different sizes of prints. A control system coordinates the longitudinal movement of the print paper and the rotational and transverse movements of the lens turret. A printing method utilizing the printer includes the step of transversely shifting the lens turret whereby the image is shifted transversely on the print paper.

Abstract: An improved device for delivery of a medicament to the digestive tract of a ruminant animal comprises a polymeric medicated core retained in a dense tube by a relatively thick layer of an elastic sealant.

Abstract: A gas tight cell receives an unmetered stream of sample gas. The cell is divided into a reaction chamber, as drift chamber and an ion collector chamber by transverse shutter grids normally carrying an ion repellent charge. The inlet of a chromatograph analytical column is connected to the outlet of the cell ion collector chamber. Inert gas admitted to the ion collector chamber is divided into a drift gas stream and into an oppositely directed carrier gas stream. The drift gas flows from the collector chamber through the drift chamber and out the reaction chamber. The carrier gas flows from the collector chamber through a deionizer into the chromatograph column. An electrostatic field urges sample gas ions from the reaction chamber toward the ion collection chamber. The ions are blocked from entering or exiting from the intervening drift chamber by the charge on the shutter grids.

Abstract: A computerized video imaging system is provided which includes a target mount for supporting a target photographic transparency. A lamphouse is positioned to pass light through the transparency and includes light sources for a set of primary colors. An image sensor is positioned to receive light passing from the lamphouse through the transparency and generates video signals representing hue and intensity of the light. Image storage means are provided for storing color reference representations of the reference transparency. A color video monitor receives signals related to the reference representations and the target video signals. A computer interfaces with the light source and the image storage to calculate photographic color correction values for the target transparency.

Abstract: A Viterbi algorithm error correcting decoder is configured of a trellis of branch-distance circuits each of which is formed of sets of diode and controlled interconnecting switches. During a respective bit time of the signal to be decoded, the branch-distance circuits are controlled so as to connect a number of diodes in each branch of the trellis proportional to the distance of the diode branch of interest to the received code branch. Due to the nonlinear voltage-current characteristic of a diode, only the path through the trellis of the branch-distance circuits having the minimum distance from the received data will draw current. Detection of this current-carrying path is used to implement the Viterbi algorithm decoder.

Abstract: A non-linear equalizer corrects for intersymbol interference in a digital data transmission system by introducing baud rate samples into an N-stage tapped delay line and provision is made for storing a sequence of M prior decisions in a prior decision register. Both the samples from the tapped delay line and the contents of the prior decision register are coupled to a weighting matrix processor which is updated to permit adaptation to different channels conditions. When initially placed into operation, a training sequence is coupled to a reference register and differences between arrived-at decisions and the true symbols are employed to provide an error vector which is then used to update the weighting matrix in the processor. Decisions on the data estimates are hard-limited to form a set of M prior decisions which are placed into the prior decision register.

Abstract: Equalizers are commonly used in digital data signaling systems to reduce the effects of intersymbol interference on a signal received over a transmission channel. However, conventional equalizers are relatively slow due to their use of multipliers. Also, generally such equalizers are limited to providing a linear response to the received input signal samples. Accordingly, to provide a high-speed equalizer which is capable of both linear and nonlinear response, a transmission channel signal containing intersymbol interference is passed through a delay means which provides sequential Q-bit samples of said transmission channel signal. These Q-bit samples are then applied to a weighting means which includes a memory having stored equalizing weighting values which are accessed in accordance with the Q-bit samples to provide predetermined weighted output words in response to the Q-bit samples. These output words can be either linear or nonlinear with respect to the Q-bit samples.

Abstract: In typical error correction coding techniques for use in multilevel signalling schemes, such as M-level QAM signalling, the full data stream is encoded. In order to eliminate the need for such extensive coding while still allowing for accurate decisions as to the received data, the present system and method provide techniques for only encoding the lower significance bits of the multi-bit signal. The more significant bits are left uncoded. Accurate decisions are still possible in the majority of cases with this technique inasmuch as the most likely errors in uncoded transmission occur in deciding between adjacent received signal levels. These errors are eliminated by encoding the lower significance bits without the need for encoding the more significant bits.

Abstract: Distortion introduced into a multiamplitude signal format by a high power microwave amplifier is compensated by a system which adapts itself to non-linearities present in the amplifier and predistorts the input signals before they are subjected to the non-linearities created by the amplifier. The degree of predistortion is non-fixed and varies or is updated as the non-linear conversion characteristics of the amplifier change with time.

Abstract: An improved oil seal arrangement for a rotary engine in which one side of the rotor has an adapter ring attached thereto with the ring having circumferentially-spaced ribs aligned with the internal partitions of the rotor and in which the outer periphery of the adapter ring has an annular notch to provide an annular recess between the ring and rotor to receive therein an oil seal assembly, and in which the other side of the rotor has a gear ring attached to the rotor with the gear ring having circumferentially-spaced ribs aligned with the internal partitions of the rotor and in which the outer periphery of the rotor gear ring has an annular notch to provide an annular recess between the gear ring and rotor to receive an oil seal assembly.

Abstract: A computerized video imaging system is provided which includes a target mount for supporting a target photographic transparency. A lamphouse is positioned to pass light through the transparency and includes light sources for a set of primary colors. An image sensor is positioned to receive light passing from the lamphouse through the transparency and generates video signals representing hue and intensity of the light. Image storage means are provided for storing color reference representations of the reference transparency. A color video monitor receives signals related to the reference representations and the target video signals. A computer interfaces with the light source and the image storage to calculate photographic color correction values for the target transparency.