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an analog or digital computing device for the determination of the coordinates of a point moving continuously along an analytically given curve.

Interpolators are used as control devices in programmed control systems; the output signals of the interpolator act directly or with the help of intermediate carriers (perforated or magnetic tapes) on the drive mechanism of the working tool of the controlled object (for example, a metal-cutting lathe), with the result that the working tool moves in space or in a plane along the required curve. The method for giving the parameters of the curve depends on the type of interpolator and the method used to solve the equation of the curve.

The simplest interpolators are continuous-action (analog) interpolators for determining straight-line segments potentiometers, certain types of compensators). A potentiometer in the circuit of a linear interpolator controls the motion of the working tool along one coordinate axis. The voltage supplied to the potentiometer is proportional to the length of the segment to be worked, whereas the voltage taken off by the slide of the potentiometer is proportional to the coordinate of the moving point, that is, to the required displacement of the working tool.

A discrete-action (digital) interpolator is a computing device whose initial data are coded (binary, decimal) numbers and whose output signal is a series of uniform discrete electrical pulses or simple phase shifts, each of which causes an elementary movement of the working tool of the device being controlled. The basic elements of discrete interpolators are digital integrators, various combinations of which form interpolators that work out straight lines, circles, hyperbolas, parabolas, and other figures.


Chernyshev, A. V., and A. B. Iakhin. Avtomatizatsiia obrabotki na metal-lorezhushchikh stankakh s primeneniem programmnogo upravleniia. Moscow, 1959.
Tsifrovye analogi dlia sistem avtomaticheskogo upravleniia. Moscow-Leningrad, 1960.
References in periodicals archive ?
2009) and designed with slight modifications in interpolator design as shown in Fig.
The interpolator used in the grid generation of data that best represented the behavior of the surface and showed the lowest residual values (mean -0.
This method differs from the dasymetric method in two important ways: the dasymetric methods are local interpolators, and the regression methods are global interpolators.
In the technical program of the conference STMicroelectronics researchers and designers will also be presenting nine other papers, covering multimedia signal processing, oversampled A/D converters, D/A converters, MEMS, CMOS imaging devices, fingerprint sensors, microprocessors, interpolators and digital systems.
Interpolators and extrapolators are based on shipments and inventory-change data from the Bureau of the Census Annual Survey of Manufacturers and the 1996 annual input-output tables.
Heidenhain controls TNC 426 and 430 feature spline interpolators and are therefore well equipped for the future.
Designed to test new-generation digital switches such as the 5ESS, it can also put a wide range of other equipment through its paces, including channel banks, T1 multiplexers, large PBX installations and digital speech interpolators associated with earthstation equipment.
14 Case Study: Multirate Decimators and Interpolators.
Spatial interpolators also have been used to correct systematic errors that exist in DEMs generated by methods other than spatial interpolation (Doucette and Beard 2000).
These include adaptive finite impulse response (FIR) filters, fast Fourier transforms (FFT), interpolators and discrete-cosine transforms (DCT) that are required for video compression and decompression, encryption, convolution and other multimedia applications.
The AD9146 features 2x and 4x interpolators with fine NCO (numerically-controlled oscillator) modulation that enables baseband signals to be placed anywhere in the D/A converter bandwidth to ease design engineers' system frequency planning.