1. A variable frequency pulse radar system comprising: A transmitter, a receiver and means for initiating successive radar transmission-reception cycles at successive frequencies; listening means for picking up, while one of said radar cycles is running at a given carrier frequency, signals on the air at various frequencies different from the actual radar cycle frequency; means for selecting one of said frequencies; and means for tuning said radar transmitter and said radar receiver during the n...

A random predictor electronic system has groups of lights with each group having at least two differently colored light sources. A logic circuit has its output connected to the groups of lights. A first oscillator controls a binary stage electronic counter with the output of the counter being one input of the logic circuit. A second oscillator powered by a source of electric potential has its output being a second input of the logic circuit. A player actuated manually positionable switch is conn...

The present invention relates to an array antenna radar receiver for tracg a signal source wherein selected phase-delay patterns of array elements are randomly selected to produce a random scan which is effectively interference free.

A method of generating random numbers which comprises sampling, in a random manner, a pseudo-random generator. The random number generator comprises a pseudo-random number generator for generating pseudo-random numbers, a synchronous random pulse generator for generating synchronous random pulses and sampling means for sampling a pseudo-random number, the sampling being done at each instance one of the synchronous random pulses is generated, whereby to generate an output random number.

A random dispensation game characterized by the provision of a housing simulating a barn-like structure having a concave top portion with a central opening therein, and conical dispensing member below the central opening, a ball-like playing member intended to be deposited upon the concave portion of the top member and allowed to drop through the opening onto the dispensing member. A plurality of openings in the walls of the structure are in communication with the dispensing member. A door which...

Current to a primary load is sensed and utilized in order to simultaneously complete a circuit which includes a secondary load and a triac. A current transformer has a primary winding in series with the primary load and a secondary winding coupled to the cathode and gate electrodes of the triac, so that a current to the primary load will cause a gate current sufficient to switch the triac from a non-conducting state to a conducting state.

Random access information retrieval apparatus for selecting a particular item from a plurality thereof including an improved pair of x-y coordinate digitally positionable devices which are driven by a four-way control valve. A polar coordinate random access information retrieval apparatus including a rotatable recording disc having information recorded on at least one surface thereof, a transducer for detecting said information, radial positioning means for moving said transducer radially along ...

A frequency generator includes a clock source, a variable modulus counter, a fixed-modulus counter, a shift register and an exclusive-OR circuit. In order to obtain a truly pseudo-random sequence of frequencies at the output of the variable-modulus counter, for use in coding voice intercommunications or the like, pulses derived from the pseudo-random frequencies by the fixed modulus counter are used to clock the shift register which develops the pseudo-random sequence in conjunction with the exc...

The specification discloses a random digital code generator operable over a series of key cycles for generating a randomized digital bit during each key cycle. The generator includes a plurality of first registers each having a predetermined cycle period which does not have a common factor with the cycle period of any other of the first registers. Circuitry is provided to step each of the first registers a predetermined number of steps per key cycle. A plurality of second registers are provided,...

A random integer generator formed of a plurality of pseudo-random generators. Each of the pseudo-random generators is formed of a shift register having feedback to maximize the period of the shift register. The shift registers are of different sequence length and are all simultaneously clocked. After a number of clocking pulses, the number of either ones or zeros in a selected sample size of the shift register outputs are counted and summed, with the sum being a random integer.