Abstract: The invention is described in the environment of a binary data magnetic recording and reproducing system and comprises a binary to non-consecutive zero code converter for encoding the input binary data into a non-consecutive zero code which, in turn, is recorded on the magnetic medium. In recording, a flux transition occurs for each ONE of the non-consecutive zero code. A bipolar peak detector detects the flux transitions and thus detects the presence of the recorded ONEs. The peak detected signals are utilized to continuously trigger a mono-stable multivibrator having a period whereby the multivibrator relaxes to its stable state in the absence of a ONE which denotes the presence of a ZERO. The peak detected signal and the output of the mono-stable multivibrator are utilized to synthesize a clock signal from the recorded non-consecutive zero data.

Abstract: Control apparatus for an aircraft area navigation system computes a predetermined curved path from the inbound course to the outbound course of a waypoint or the inbound course to the next waypoint and provides aircraft steering signals with regard to the predetermined curved path. A bank angle bias command is applied to the apparatus for effecting transition from the inbound course to the curved path and is removed when the aircraft transitions from the curved path to the outbound course. Cross track and track angle error signals are generated with regard to the predetermined curved path for steering the aircraft thereon as the course transition is effected.

Abstract: A monolithic integrated circuit, fully decoded memory comprises a rectangular array of variable threshold field effect transistors organized into a plurality of multi-bit words. Binary address inputs to the memory are decoded by a field effect transistor decoder into a plurality of word selection lines each of which activates an address buffer circuit. Each address buffer circuit, in turn, drives a word line of the memory array. In accordance with the word line selected by the decoder the activated buffer circuit directs reading or writing voltages to the transistors comprising the memory words. All of the buffer circuits additionally are connected to a common terminal for clearing all of the memory transistors to a predetermined state by the application to the common terminal of a large magnitude voltage of a predetermined polarity.

Abstract: An indicator for a flight director instrument particularly for use in rotary wing aircraft includes a command cue having a shape resembling that of an associated aircraft control element or stick and includes cooperating indicia representative of the direction to move the control stick so as to center the cue and thereby satisfy the command. This novel indicator arrangement engenders an instinctive pilot response to move the associated control stick to satisfy the flight director command.

Abstract: Apparatus for providing a measure of the acceleration of an aircraft along its flight path derived from computations involving inertial measurements of longitudinal and normal accelerations of the aircraft relative to the direction of the earth's "g" field as determined by a gyro vertical, in conjunction with a measurement of true airspeed as determined by an air data computer responsive to a Pitot static sensor. The computation includes filtering means responsive to the inertial and air data measurements to compensate for the relatively long term errors introduced by the gyro vertical erection characteristics and the relatively short term errors introduced by the Pitot-static sensor of airspeed.

Abstract: A semi-automatic takeoff flight control system for automatically capturing a predetermined takeoff pitch attitude at a predetermined pitch rate during the aircraft takeoff rotation maneuver. In response to the manual rotation command from the pilot, control circuitry generates a pitch rate command to the elevator, limited to the predetermined pitch rate. As the craft rotates to an intermediate pitch attitude less than the desired predetermined takeoff climb attitude, circuitry is included to provide a pitch attitude command with regard to the predetermined reference attitude, which by virtue of rate, displacement, and integral control provides asymptotic capture of the predetermined reference attitude.

Abstract: A radix converter comprises a plurality of automata each of combined Moore and Mealy design. The automata are connected in cascade with the digits of the input number applied serially to one of the automata. The Moore output of each automaton stage is utilized to provide the final state of the stage and is representative of a respective coefficient of the number in the transformed radix. The Mealy output of each stage is an untransformed residue transferred to the next identically designed automaton circuit. For numbers of integral value each automaton operates in accordance with the equation: ##EQU1## For numbers of fractional value each automaton is instrumented in accordance with the equation: ##EQU2## Where in the above equations: S = Present state of the stage S* = Next state of the stager.sub.a = Current radixr.sub.b = Desired radixZ = Mealy output to the next stageI.sub.0 (r.sub.a).sup.0 = Weighted input or residue digit in integral number conversionI.sub.-.sub.1 (r.sub.a).sup.-.sup.

Abstract: Apparatus for combining positional data from OMEGA and VOR/DME radio navigation systems to provide computed positional data corresponding thereto includes a circuit for generating an OMEGA compensation in accordance with the difference between the computed value of the positional data and the VOR/DME value thereof. The computed value is provided by algebraically adding the OMEGA compensation to the positional data from the OMEGA system. The gain of the OMEGA compensation circuit is adjusted in an inverse relation with respect to the range of the aircraft from the VOR/DME station thus providing high accuracy positional data throughout the enroute flight of the aircraft without the attendant complexities and inaccuracies normally associated with the separate OMEGA and VOR/DME radio navigation aids.

Abstract: Data channel gain-variation distortions are reduced by the following combination of operations. Successively occurring data items are cumulatively added in modulo fashion thereby providing a sequence of partial sums. An exponentiating circuit is introduced to provide an exponential function of the partial sums. The exponentiated partial sums are then recorded or transmitted on a data channel wherein the signals are distorted by relatively slow gain variations thereof. The received distorted signals are applied to a logarithmic circuit wherein the multiplicative gain variation distortions are converted to additive distortions. The logarithmically converted signals are applied to a subtractor that sequentially provides the differences in modulo fashion between successively occurring signals from the logarithmic circuit thereby yielding the data items with the distortions substantially reduced.

Abstract: A data transmission system utilizing the telephone voice communication network for transmitting data between the location of a telephone subscriber's handset and a central station. A data transmitter is capacitively coupled to a bridge tap on the subscriber loop at the subscriber's handset and a data receiver is capacitively coupled to a bridge tap on the subscriber loop at the associated telephone company central office. The data transmissions occur at frequencies outside the standard telephone voice transmission frequency band of the system thereby providing continuous data transmission service without interfering with the normal voice communication function of the system.