SU506845A1 - Digital function generator - Google Patents

Description

The digital function generator works as follows.

 The codes for setting the frequency, the type of the reproduced function, and the level and coefficient of the form of the function are received from the digital computer in the control unit 3 and written to the input registers via the receive keys (AND schemes) and addressing of controlled devices. The corresponding codes are written off by the transfer pulse to the memory registers of converter 2, function quantizer 12, code-voltage converter 13 and driver 5. One of the memory bits of control unit 3 supplies a switching potential to the AND-1 oscillator circuit of the clock frequency, from which a uniform clock sequence of quartz pulses is fed to the input of the counter of the converter 2. At the same time, the counter changes its code indication of the state from a single step to such a clock value such that the inverse value k yes state counter inverter 2 becomes equal to the inverse value of the code stored in the memory register 2. Output transducer code comparing counter is zeroed inverter 2, wherein the output pulse converter 2 is formed. As a result of many cycles of code comparison, an output of the converter will have a raviomer pulse sequence with a frequency proportional to the control code of converter 2, which is transmitted to formr 5, where it is applied to the nerve inputs of all three-input AND circuits and counted by driver 5.

The de-encrypted potential intervals of the counter of the generator 5 from the outputs of the counter generator of the generator 5 are sequentially applied to the third inputs of the AND circuits, to the first inputs of which from the bit outputs of the register of the imager 5 a control code is applied as a combination of "single and" zero potentials. From the outputs of the circuits "PI through the circuit" OR shaper 5 to the input of the reversible counter 6, an uneven pulse sequence enters. At the same time, the number of pulses excluded by the Furmier 5 from the input uniform sequence is determined by the number of "zero values of bits in the code recorded in the register of the former 5. The unevenness of the excluded pulses is determined by the bit distribution of the" zero values of the code in the register of the former 5.

At the same time, the uneven pulse sequence from the generator 5 enters the digital input of the digital controlled frequency divider of the generator 4, the coefficient of which frequency division is proportional to the control code and is equal to the number of quits by the period of the reproduced function.

When entering into shaper 4, the number of pulses equal to the number of quanta per function period, and therefore equal to

and the division ratio of the frequency divider 4, the output of the latter generates a pulse that will "zero the counter of the imager 5 and cause the next cycle to repeat the non-uniform pulse sequence, which is inside the reproduced function. Reversible counter 6 works in forward and reverse counting when forming symmetric

fuction with respect to the x-axis or in the direct counting mode before overflow with the division factor set using the decoder 9 and the switch 10, the decoder 8 reads from the reverse

counter 6, time-calibrated time intervals between recalculated pulses, which are successively along the corresponding verticals of the matrix field of the function quantizer 12 through multi-digit soils of key circuits. And each vertical is applied to the myroid-shaped inputs of the resistor dividers of these verticals in the form of a reference nanometer. , the memory of the function quantizer register 12 is switched by triggers according to the code written in each of the triggers of the registers of each vertical. Formed sequentially on time multibit dnymi resistor dividers verticals kvaitovatel functions 21 quantized by the level of temporary nntervaly (quantized discrete unit) nanr zheny summed sequentially in time miogovhodovoy circuit "OR quantizer function 12 and a quantized voltage predetermined codes fuiktsionalnoy depending coming from the quantizer 12 ua the input of the code-voltage converter 13. The code-voltage converter 13 performs programmable attenuation of the reproduced function proportionally to the control code of the transducer 13, wherein the quantization sampling values are selected in accordance with the type of reproduced function and in accordance with the initial phase of the reproduced function to be set.

Formula and 3 about b and e and

A digital function generator containing a reference clock, connected to a code-frequency converter input, a reversible counter connected through a serially connected decrypter of sequential reading of the counter information, and a function quantizer to the input of a code-voltage converter and a serially connected reverse decoder and switch of impulses and a switch decoder

of the reverse - to the trigger of the reverse, the output of which is connected to the control input of the reversible counter, a stabilized rectifier connected to the decoder of the sequential reading of the counter information, and the unit

control outputs of which are connected to the corresponding inputs of the reference clock, code-frequency converter, function quantizer, reverse decoder switch, and code-voltage converter, characterized in that, in order to improve the accuracy of the functions, it contains a period period generator and a driver uneven pulse sequence in the period of the function, the counting input of which is connected to the output of the code-frequency converter, one of the outputs - to the counting input of the reversible About the counter, and another output to the counting input of the function period generator, the controlled input of which is connected to the output of the control unit, and the output to the zero input of the generator of an uneven pulse sequence in the function period, the control input of which is connected to the output of the control unit.

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