Abstract: According to the present invention, a gun is provided which has a valve assembly receiver and a product discharge valve assembly which are adapted to cooperate with each other and which may be readily and accurately secured together in a fast, foolproof manner. The product discharge valve assembly may be readily removed by hand without the use of tools, and misalignment between the inlet passages on the valve assembly and the outlet passages in the gun body is eliminated. The outlet and inlet ports respectively are aligned securely and positively by the combination of a V-groove self-centering arrangement on the receiver, a counterpart arrangement on the discharge valve assembly, and a cooperating alignment on the discharge valve assembly, and a cooperating alignment and locking stud unit.

Abstract: A method and apparatus for decoding of frequency inversion based scramblers is disclosed. A quadrature amplitude modulation detector determines the frequency of the tone used for inverting the scrambled signal by determining which of a plurality of quadrature detector pairs, each using a different conversion frequency, has the greatest magnitude difference between the quadraturely related signals. The frequency of the quadrature pair with the greatest difference is the frequency of the inverting tone during the inverting period of time. This frequency information is used to generate a reinversion tone to unscramble the scrambled signal.

Abstract: A gun having a gun body which includes a housing for component inlet and outlet passages and for a product flow control valve, which further includes a handle, a nozzle receiver assembly, and a trigger for rotating a spool valve between open, closed, and intermediate positions, and wherein means are provided for controlling the proportion and flow rates of the components within the flowing passages, and to facilitate insertion, locking, and ejection of the nozzle within the gun body.

Abstract: A cryptographic apparatus for encrypting and decrypting digital words includes a mechanism that permits a cipher algorithm to be electronically stored after the manufacture of the apparatus. The storing mechanism includes at least one electrically erasable, programmable gate array containing a portion of the cipher algorithm and at least one random access memory device coupled to the array for storing digital data generated by the algorithm. A mechanism which is coupled to the gate array and memory device controls the execution of the algorithm for each digital word thereby decrypting encrypted digital words and encrypting non-encrypted digital words.

Abstract: A zener diode random number generator circuit is described which produces a random binary number output having a statistical distribution exhibiting a controlled degree of randomness determined in response to an input control signal. A microprocessor feedback circuit monitors the random number output and produces the input control signal in response to the difference between the degree of randomness of the output signal and that of a pre-determined statistical distribution. The digital feedback automatically adjusts the zener diode biasing point and the limiter threshold such that part-to-part tolerance, component aging, temperature variations, or voltage fluctuations will not adversely affect the randomness of the bit stream output. In the preferred embodiment, the microprocessor tests the ratio of ONES bits to ZERO bits of the random number such that a desired 1:1 ONES/ZERO ratio is approximated.

Abstract: A gun having a gun body which includes a housing for component inlet and outlet passages and for a product flow control valve, which further includes a handle, a nozzle receiver assembly, and a trigger for rotating a spool valve between open, closed, and intermediate positions, and wherein means are provided for controlling the proportion and flow rates of the components within the flowing passages, and to facilitate insertion, locking, and ejection of the nozzle within the gun body.

Abstract: A television transmission system for asynchronously transmitting a television picture as a plurality of video samples over a narrow bandwidth medium from at least one remote transmitting site to a receiver at a base station. Improved synchronization between the transmitter and receiver are achieved by a dotting pattern consisting of alternating logic ones and zeros being sent by the transmitter to precede the video samples such that a sampling clock at the receiver synchronizes to the phase of the dotting pattern and thereafter samples the video signal. The video signals are also preceded by at least one predetermined digital word which identifies the particular remote transmitter and prepares the receiver to begin receiving the video samples. DC restoration circuitry determines the average value of the incoming video signals and to add an appropriate DC offset to the video signals to correct for any change in the gray scale of the video samples.

Abstract: A television transmission system for asynchronously transmitting a television picture as a plurality of video samples over a narrow bandwidth medium from at least one remote transmitting site to a receiver at a base station. Improved synchronization between the transmitter and receiver are achieved by a dotting pattern consisting of alternating logic ones and zeros being sent by the transmitter to precede the video samples such that a sampling clock at the receiver synchronizes to the phase of the dotting pattern and thereafter samples the video signal. The video signals are also preceded by at least one predetermined digital word which identifies the particular remote transmitter and prepares the receiver to begin receiving the video samples. DC restoration circuitry determines the average value of the incoming video signals and to add an appropriate DC offset to the video signals to correct for any change in the gray scale of the video samples.