A plurality of amplifiers have their outputs connected with an input signal to an analog adder. The amplifiers are disabled successively by a clamp. The adder output voltage versus input voltage curve is then a continuous function of contiguous straight line segments which increase or decline in slope in a steplike fashion. Function generator operation is insensitive to temperature and temperature changes produce no errors as in the prior art. The nonlinear voltage-current characteristic curve o...

Methods and apparatus are disclosed for producing an output signal by interpolation from a finite plurality of samples representing values of a function at sample points thereof. The output signal is produced as the sum of reconstruction functions having similar shape, one each associated with each sample point and so chosen as to ensure a frequency spectrum that is substantially band-limited and an output signal that is substantially continuous when the samples are updated and to produce a cons...

A segmented voltage function is generated at the output of a primary differential amplifier having an input voltage connected to the noninverting terminal. As the input voltage increases at the noninverting amplifier input, the output increases with the same slope until a voltage as sensed at the inverting input of the amplifier equals a first breakpoint. The inverting input to the primary differential amplifier connects to a feedback circuit that also includes a plurality of secondary different...

A blending function generator for use in the electronic commutation of a ring of antenna elements in doppler omni-range (DVOR) systems. The blending function comprises a first lobe flanked by second and third lobes, the first lobe consisting of a cosine lobe having a period of 2T seconds where T= Ymn where m is a number and n is a whole number, the second and third lobes each consisting of a cosine lobe having a period of T seconds, the second and third lobes being of the same phase and of oppos...

A nonlinear generator in which each of a plurality of sections includes two differentially connected devices each of which comprises a first string of elements having the same voltage-current characteristics and through which an input current is passed to provide a voltage which is applied to a second string of a different number of similar elements to produce a current from which there is obtained an output which is proportional to the input raised to a power which is the ratio of the numbers o...

A storage capacitance across which a ramp function signal is to be generated is serially related through a fixed resistor, electric signal variable-voltage solid-state device to a source of charging current. The potential developed across the capacitance is one input to a differential amplifier. Selectively variable potentiometers relate the differential amplifier output to the variable-voltage device correspondingly controlling the capacitance charging current. A further aspect is the use of ba...

Approximation of a function relating an independent to a dependent variable. A first resistance furnishes signals corresponding to the independent variable values at a plurality of first taps, a second resistance furnishes dependent variable signals at a corresponding plurality of second taps. A first and second contact arm respectively scan the first and second resistors simultaneously. A feedback circuit has an input terminal connected to the input furnishing the value of independent variable ...

A function generator comprises an openable and closeable series-circuit path having a node and which is closed only while a voltage at the node has a predetermined polarity with respect to a threshold voltage. An emitter-follower circuit has a transistor biased by a substantially constant voltage source and a resistor divider network. A transistor operated as a diode so as to have at most unity current-gain cooperates with the emitter follower to determine the transition between opening and clos...

A control circuit which responds to plural characteristics of an apparatus. When synchronism of the characteristics is lost for a period of time, a signal is given to turn the apparatus off.

A programmable electronic calculator is provided for numerical evaluation of mathematical problems through application of one or more mathematical operators to each input numerical operand of a mathematical problem according to accepted rules of mathematical combinations. Entry of each numerical operand and mathematical operator is accompanied by a printed record of that numerical operand and that mathematical operator so that the mathematical problem may be continually monitored as it is being ...