SU551660A1 - Sine-cosine frequency converter - Google Patents

Description

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The invention relates to computing and can be used in the construction of specialized computing devices that implement trigoiometric transformations.

Sinus-sinus impedance converters are known, which can be used to convert frequency l.

These devices, which contain pulse-controlled conductances (nonlinear impulse voltage dividers), operative amplifiers and voltage sources, are intended for sine-cosine conversion to voltage of relative length of square wave fli g / T, where G is the pulse duration, Their T-period, with a variable clock frequency -f -ifc followed by pulses of constant duration Td, can provide the same characteristics of converting this frequency to voltage, since tp / TsCof- Such devices Islands, realiau-. Ute sine-cosine dependences only within a limited range of variations in the argument of functions not exceeding half a period, and are sufficiently | high speed

Also known is a siaus-cosine frequency converter containing a square pulse shaper, whose input is the input of a converter,

and the output is connected to the input of the differentiation unit, and the memory unit, the output of which is the output of the converter {1, and input

connected to the output of the controlled key G21.

The disadvantage of such a device is the complexity of its structure.

In order to simplify the structure, the proposed sine-cosine frequency converter includes a delay unit, the input of which is connected to the output of the differentiation unit, and the output is connected to the control input of the controlled key, the input of which is connected to the input of the square pulse former.

The drawing shows a diagram of the Converter.

Claims (2)

The converter contains serially connected rectangular pulse generator 1, differentiation unit 2 and delay unit 3 and serially connected control key 4 and memory unit 5. The main input of key 4 is connected to the device input, and the control input to the output of delay unit 3 The converter operates as follows. The input of the imaging unit 1 receives the input voltage of sinusoidal form with a constant amplitude U and the converted frequency f. At the output of the former 1, a sequence of square-wave pulses of the same frequency is formed, which are differentiated by block 2. Narrow output pulses of differentiation unit 2 of one polarity, corresponding to the leading edges of square-wave pulses fed to it and coinciding with the moments of an input sinusoidal voltage zero-through the side of increase, pass through the delay unit 3 and after a delay of time T, enter the control input of the switch 4, which is closed by their action. Thus, the input voltage U-siTt 2irft at time points 57 counted from the moments -t 0 of passing this voltage through zero upwards is transmitted by key 4 to memory block 5, which fixes the voltage value to the next key closure. UBb, x - «-f The output voltage IJ of the device deactivation is removed from memory 5 as a step function, which jumps at the moments of key 4 and represents, in accordance with the expression, the sinusoidal function of the frequency f being converted, and obtaining frequency information at time intervals equal to the period of the input signal determines the high speed of the device. In addition, by choosing a sufficiently large value of Tj, it is possible to ensure the transformation within wide limits of the change in the argument of the sinus function, many times exceeding its period. When setting the input signal frequency f, counted from some initial value f ", so 4Tof according to the given expression for the conversion function, we obtain the dependence b.x.21ГТ, f" corresponding to the sinus function of frequency f with a phase shift determined by the value 2 2ГГ, f J and the choice of the values fn and Cj, satisfying the equality 2 fT Г f Tt / 2, ensures that this dependence is obtained as a function of the basis of the proposed device, supplemented in necessary cases by sine frequency converters of parameters long signal, specialized sine-cosine transducers of various parameters can be built, combining high-fidelity reproduction of specified functions and sufficient speed with simplicity of the circuit and having improved technical and economic indicators compared to sine-cosine transducers implemented by other means. Claims A sine-cosine frequency converter comprising a square pulse driver whose input is the converter input and the output is connected to the input of a differentiation unit, and the memory block whose output is the output of the converter, and the input is connected to the output of a controllable key, characterized in that, in order to simplify the structure, it contains a delay unit, the input of which is connected to the output of the differentiation unit, and the output is connected to the control input of the control key, the input of which is It is connected to the input of a square pulse former. Sources of information taken into account in the examination: 1.St. NikitenkoS. P Smopova, VB, Ugryumova, E. P., Time-impulse functional transducers with approximation of reproducible dependencies by rational fractions in a train. Automation and Remote Control 1973 g, N ° 2. 2. SmopovV. B. Analog Computers, M., 1972, p. 218 (prototype).