SU921074A1 - Code-to-frequency converter - Google Patents

Description

(54) CODE-FREQUENCY CONVERTER

Inventor {ognositsa to automation ,. computer technology and telemechanics, in particular, to pulsed-discrete devices for converting digital parallel clods to the pulse frequency of electrical impulses, and can find application in various devices and automatic control and regulation systems. A device for converting kozov to a frequency is known, which contains the first counter impul1s, the first outputs of which are connected via serially connected first multiples, the matching matching element and the delay element to the first input of the OR element, the second input of which is connected to the output of the pulse generator, and the code to the counting input of the first pulse counter, the second pulse counter, the outputs of which are connected to the outputs of the second multi-input switch; an additional multisode coincidence element and two pulsed adders, the first input of the first of which is connected to the OR output, the second input of the pulse adder is connected to the output of the additional multiplier. A match, the inputs of which are the key to the amp; To the second outputs of the first counter of pulses, and the output of the first adder is connected to the first input of the second adder, the second input of which is connected to the output of the multi-input Coincident Element, and the second adder's counter Ll. The disadvantage of this device is that it provides the required relationship between the code and the number of pulses per unit of time with a highly uneven arrangement of pulses. It is also known A device for the phobing of digital codes into a pulse frequency, containing a generator, a time interval generator T, an I circuit whose first input is connected to the output of the first N frequency divider controlled by the input 392 of the N output frequency divider, and the code is connected to the counting input of a binary counter, vtfoy adjustable frequency healer, the pulse input of which is connected to the generator output, and digital control inputs with binary inputs of binary counter 2. This device provides equal time stanszhku.vyhodnyh impulsrv, but the linearity of frequency-converting the code is provided only at the second slope ma code conversion in pulse repetition frequency, target invention - increasing twist; us transform. The goal is achieved by the fact that, in the Code-Frequency Converter, containing the pulse generator, are connected to the time source driver, performed on a binary frequency divider, the bit outputs of which are connected to the clock pulse generator BxoiiaMH, the first input of which is connected to the output of the clock pulse generator, the second input is connected to the output of the first controlled frequency divider, and the output is connected to the counting input of a binary counter, whose codes are connected to the pack The control inputs of the second controlled frequency splitter, whose pulse input is CONNECTED to the output of the pulse generator and to the pulse input of the first controlled frequency splitter, controls the inputs of which are connected to the input-code bus, introduced an additional binary counter, an additional And element, the OR element, an additional controllable frequency divider and a calculator, a control “1” whose inputs are bitwise connected to the outputs of a binary counter, and the outputs are bitwise connected to the control inputs of an additional one. controlled divider L A «JU-A W Ch. T (. ", L l, frequencies, the pulse input of the coupler is connected to the output of the additional element I, the first inputs of which are connected to the output of the pulse generator, and the second inputs are bitwise connected to the outputs of the additional binary counter, the counting input of which is connected to the first the input of the OR element and the additional controlled frequency divider, and the zero input is connected to the second input of the OR element and to the output of the second controlled frequency cedar. The figure shows the electrical circuit diagram of the converter 44 Converter contains bus I in master code, 2 pulse generation, binary 3 frequency divider, 4 clock driver, Element 5, binary counter 6, calculator 7, first controlled frequency divider 8, additional controlled frequency divider 9 , the second controlled frequency divider 10, the additional counter 11, the element OR 12, the additional element AND 13, the output bus 14. The output of the generator 2 is connected to the pulse inputs of the first and second controlled dividers of 8 and 10 frequencies, about the input of the binary divider 3 frequencies and to one of additional inputs of the AND 13 output of the first controllable frequency divider 8 is connected to one input of AND gate 5, a second input coupled to visodom shaper 4 clock pulses, the inputs of which are connected to the binary outputs porazr dnymi 3 frequency divider. The output of the element 5 is connected to the input of the counter 6, and its bit-sized outputs are connected to the inputs of the calculator 7 and to the inputs of the second controlled divider 10 hours. tots, - The outputs of the calculator 7 are connected to the digital inputs of the additional controlled divider frequency 9, the output. the second input of which is connected to the output of the second controlled frequency divider 10 and connected to the input of the additional counter 11, the bit outputs of which are connected to the inputs of the additional element And 13, the output of which is connected to the pulse input of an additional controlled frequency divider 9. The device works as follows. Convertible code N, arriving at the digital inputs of the first controlled. W makers of frequency 8 sets the division ratio of this divider. At the output of the first controlled divider, pulses are generated, the period T of the sequence is determined by the following expression; where f is the output frequency of the oscillator 2. Pulses with a period of following T are fed to one input of the element AND 5, -An input 1 of the input of this element AND the input signals of the former: 59: 2; 4 clock pulses. This driver for one cycle (dialing time from zero to full code)} аб} abats a pulse of duration T. During the action of the WLL pulse with a duration of T, the output signals of the first controlled frequency divider are fed to the preamp zeroing counter b; The described algorithm leads to that. that after the end of the action of the pulse T, the code Mpr is set in the counter, determined by the following expression:). Obtained to N and /) are transmitted for further tpeforming to the calculator 7 and the second controlled frequency divider Yu, and the counter is communicating and thus prepared for the next tact of generating the code Mpr. Since the construction of the second controlled divider frequency U is similar to the construction of the first divider 8, then at its output, taking into account the fact that its division factor is determined by the code Mpr, pulses are generated with a period of time Tti -J-Chpr, In cases where the ratio the values of T to T is an integer, the frequency of the impulses fi, the output of the frequency divider 10. exactly cooiv corresponds to the value of the M code. In de .le, under the condition Nnp j, we dupe. -J- t, - t I However, taking into account the fact that the ratio of T to T | is not always equal to integer number, and the counter code Jnf characterizes only the integer part of the specified ratio, then the frequency fj, in general, is determined by the expression f fur- p | -fnp- (5). the larger the code value is nnp. the higher the conversion accuracy of the code N to frequency f. An increase in the Nnp code at a certain code N can be achieved by increasing the increase in the coefficient ({tcienta T, but at the same time the steepness of the conversion of the code into the frequency is mixed. The increase in accuracy reduces the slope by a factor of two times. The proposed device resolves this proporiation in the following way: (2) 4 Выбор Choosing values and T, one obtains such a robust value N | ip., Which ensures the required conversion accuracy, but does not provide the required conversion slope ( the pulse and frequency fzci. n times smaller than required, where n 2. II, 2 ...). We call these pulses the pulses of the base sequence, Each pulse is the main mediator through the element OR 12 goes to the Wi-Fi / d device and one In this case, zeroing aottoit, a wearable counter II, zeroing the counter ensures that the generator 2 output signals are passed to the impulse input of the additional signal of the decimal 9 frequency. The division ratio of the latter is determined by the output rate; calculator K | op, kotchey defined in with the following definition: n-. Since the construction of an additional controllable divider 9 of the analogue frequency is GICHELO of the construction of the first and second frequency dividers 8 and 10, then at its output (taking into account expression (6), pulses with a period of trace are formed. than the period of pulses following the main pulse sequence.Each of the output pulses of the additional controlled frequency divider goes through the element OR 12 to the output of the device and at the same time from this to the counting input of the additional counter C, Additional account The sensor records the number of pulses produced by the additional controlled divider 9. chao, tota. Once developed (l-1 m-.pulse of this series, the code of the additional | counter 11 acts on the inputs of the additional element I 13 in such a way ( at the pulse input, the additional controlled delngue 9 of the frequency stops, after some time, another impulse of the main pulse sequence is outputted, an additional checker 11 is folded again, and the next series of n -1 impulses an additional sequence, Thus, at the output of the device, a repetition is generated with a sequence of n pulses with a following frequency B n times the frequency

2P H provides an increase in the slope of converting a code into a frequency by n, times. At the same time, the dependence of the frequency of the special efficiency of pulses from the input core H does not differ from the required linear dependence by an amount greater than 100%, and the temporal irregularity of the spread within the specified pulse sequence is not exceeds ij p-100%.

So an introduction to devices. additional adjustable divider,

The frequency allows, in comparison with the known device, to increase the spinning rate of Greek formation without any loss of accuracy.

The use of the invention allows to improve the quality of automatic control and regulation.

Claims (1)

1. USSR author's certificate No., CL-H 03 K 13 / O2, 1978. 2, USSR author's certificate № 282748, class, H 03 K 13/24,. (prototype).