SU1709530A1 - Code-to-frequency converter - Google Patents

Description

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The invention relates to automation and computer technology and can be used in control systems and radio engineering installations as a software-tunable high-stability generator, as well as in information processing and transmission systems.

The purpose of the invention is to improve accuracy.

FIG. 1 shows the flow chart of the proposed converter; 2, timing diagrams explaining the operation of the proposed converter.

The code-frequency converter (Fig. 1) consists of a generator 1 of a reference frequency, a controlled counter of 2 pulses, elements AND 3, an element OR 4, a generator of 5 pulses, a D-flip-flop b, a valve 7, a sensor 8 of a code, a register 9 and a decoder 10 code.

The output of the generator 1 of the reference frequency is connected to a clock input of a controlled counter 2 pulses, the outputs of which are connected to the corresponding first inputs of elements AND 3, the outputs of which are connected to the corresponding outputs of the element OR 4, and the number of outputs of the controlled counter 2 pulses, the number of elements And 3 and the number of inputs of the OR 4 element is equal to the number of the required frequency converters, the output of the OR 4 element is connected to the input of the driver 5 pulses, the output of which is connected to the counting input of the D-trigger 6, the input of the valve l 7 and the control input of the controlled counter 2 pulses, the inverse output O of the trigger 6 is connected to its D-input, the direct output of the D-trigger 6, which is the output of the converter, is connected to the control input of the valve 7, the output of which is connected to the recording output register 9, the information inputs of which are connected to the outputs of the sensor 8 code, the outputs of the register 9 are connected to the inputs of the code decoder 10, the outputs of which are connected to the second inputs of the corresponding And 3 elements, the number of outputs of the decoder 10 codes being equal to the number of And 3 elements, and the numbers sensor outputs 8 codes and code decoder 10, and the number of information inputs is equal to each register 9

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The code set on the outputs of the sensor 8 of the code may be, for example, 8-4-21, then the number of outputs of the sensor 8 code, the number of information inputs of the register 9 and the number of inputs of the decoder 10 will be equal to four times (i.e. the number of bits code). The number of outputs of the decoder 10 code (and, respectively, the number of outputs of the controlled counter 2 pulses, the number of elements AND 3 and the number of inputs of the element OR 4) will be equal to sixteen (i.e. the number of states of code 8-42-1). In this case, the maximum number of frequency converters that are outputted at the output is also equal to sixteen (from state 0000 to state 1111). Thus, the choice of the number of generated frequencies is determined by the code sensor 8, and depending on

0 code type (binary, binary-decimal, or any other) applies the appropriate code decoder 10.

Timing diagrams explaining the operation of the proposed device (figure 2),

5 contain cycles 11 of the generated frequency, cycles 12 of each half-period of the frequency being formed, pulses 13 generated at the output of the driver 5 pulses, pulses 14 generated by the controlled

0 counter 2 pulses, pulses 15 generated at the output of the valve 7. and pulses 16 of the output frequency of the converter.

Converter code - frequency works as follows.

5 After the power is turned on, no matter what code is recorded in sensor 8 of the code and what state the outputs of register 9 are set to, one of the outputs of the decoder 10 of the code will have a logical

0 unit that permits the passage of a controlled counter of 2 pulses through one of the AND 3 pulses of the pulses to one of its outputs, which through the maintenance time through the OR 4 element initiates the puller of 5 pulses (Fig. 2). Pulse 13 from the output of the imaging unit 5 pulses sets the D-flip-flop b to one in the C-input, the state, and the controlled counter 2 pulses to the zero state; at the same time

0 will be recorded in the register 9 at the input of the record of the register 9 information recorded in the sensor 8 code (figure 2. Beginning of T1). The decoder 10 code works in such a way that, depending on the code combination on its

There are 5 inputs on only one of its outputs on Vits voltage. The logical unit, and on the other outputs, the voltage of logical zeros is preserved. Thus, only 6 one of the elements of the IZ will be submitted

0 permission to pass the overflow pulse from the corresponding output of the controlled counter of 2 pulses. Upon reaching a predetermined number of pulses (in FIG. 2 in the middle of the interval T1), the pulse former 5 starts (the beginning of the interval T1.2) and pulse 13 occurs resetting the controlled counter 2 pulses, while the O-flip-flop 6 is set to the zero state, prohibiting the passage of a pulse

13 from the output of the imaging unit 5 pulses through the valve 7 to the input of the register entry 9. The information at the output of the register 9 does not change and, as a result, the counter 2 pulses will count the exact same number of pulses in semi-tacts T 1.2, T2.2, T3.2. as in semittacks T1.1, T2.1 and T3.1, respectively (figure 2). Thus, at the forward output of D-flip-flop 6 (which is the output of the code-frequency converter), a frequency is defined by a code sensor 8, which is a sequence of logical ones and zeros, each unit and each zero being formed in a strictly defined half-period. CMejHa information at the output of the sensor 8 of the code can be made at any time after the end of the pulse duration from the output of the pulse shaper 5 and until the beginning of the next period of the generated frequency.

In the example shown in FIG. 2, the number of pulses of the reference frequency coming from the output of the generator 1 of the reference frequency is equal in the first period (T1) of the frequency, in the second period (T2) of eight, in the third period (fT3) four. Accordingly, the output frequency is proportional to the double number of pulses, calculated by the controlled counter in each half-period of the generated frequency:

fBhix-k-2N,

where k is a positive integer, k «1,2, ... n;

N is the number of pulses specified in each half-period of the generated frequency.

Thus, the high accuracy of the converter code - the frequency is achieved for

the linear conversion expense of the corresponding billed code in the frequency.

In addition, the pulse duration is equal to the pause duration in the generated period of the output frequency.

Claims (1)

Claim code converter is a frequency containing a reference frequency generator, a controlled pulse counter, AND elements, an OR element, a code sensor and a gate, the outputs of a controlled pulse counter are connected to the first inputs of the corresponding AND elements, and the code – frequency converter output is connected a first valve input, characterized in that, in order to improve accuracy, a pulse driver, a register, a code decoder and an O-trigger are additionally introduced, the output of the reference frequency generator is connected to an actuated input of a controlled pulse counter, the outputs of the AND elements are connected to the corresponding inputs of the OR element, the output of which is connected to the input of the pulse former, the output of which is connected to the D-trigger input. the installation input of the controlled pulse counter and the second input of the valve, the output of which is connected to the register entry input, the information inputs of which are connected to the corresponding outputs of the code sensor, and the outputs of the register are connected to the corresponding inputs of the code decoder, the outputs of which are connected to the second inputs of the corresponding And, O elements - The O-flip-up input is connected to the inverse output of the D-flip-flop, the direct output of which is the out & converter house code-frequency.