SU1762381A1 - Device for forming the variable-frequency signals - Google Patents

Abstract

The invention relates to radio engineering and computing, can be used in information-measuring systems. The device contains: a pulse generator (1), a frequency divider (2), two decoders (3, 6), two elements And (4, 8), a counter 5, a code-frequency converter

Description

The invention relates to computing and can be used in information and measuring equipment.

The aim of the invention is to expand the range of output frequencies.

The drawing shows a device for generating signals with varying frequency.

The device contains a pulse generator 1, a divider 2 frequencies, a decoder 3, element 4, counter 5, decoder 6, code-frequency converter 7, element 8, amplifier 9, device output 10, element 11, input 12 (code input) device control input device 13.

The code-frequency converter 7 contains multiplexers 14. a capacitor 15, a threshold element (Schmitt trigger) 16, resistors 17.

The device works as follows.

The generator 1 generates a sequence of pulses arriving at the divider

2 and counter 5. Divider 2 with decoder 3 and element 4 are designed to form bursts of pulses with variable frequency and function when the control signal is applied to input 13 of the device. In the absence of this control signal, the And 4 element is closed and no signal is output from its output to the zero input of the counter 5, the And 8 element is prepared for the opening by the H 11 element. Therefore, the counter 5 is in the cyclic counting mode of the generator 1 pulses. 5 are decoded by the decoder 6. The low bits of the counter 5 control the address inputs of the multiplexers 14. which provide a certain switching order of the resistors 17 at the inputs of the threshold element 16. The threshold element 16 together with the capacitor 15 and one of the p Due to the feedback from the inverse output of the element 16 to the input of the corresponding resistor 17, the resistors 17 form a generator whose pulse frequency depends on the value of

WITH

vj o

Yu SA) 00

holding the RC circuit. Thus, the frequency of the generated signals at the output of the element 16 is determined by the size of the resistors 17 and the sequence of their search. Multiplexers 14 are organized into groups, each of which determines the law of change in the frequency of the output signals. Each group contains one or several multiplexers 14. The selection of the frequency variation law or the selection of a group of multiplexers 14 is performed by applying an external device code to the inputs 12 of the decoder 6. 14 is provided with the lower bits of the counter 5. The signals generated at the output of the threshold element 16 through the element 8 and the buffer amplifier 9 arrive at the output 10 of the device. When the control signal is applied to the input 13 of the device, I / I element 4 is opened. the element NOT 11 the element AND 8 and the output of the threshold element 16 is disconnected from the output of the device 10, on which a pause is formed. The pauses alternate with bursts of pulses filled with pulses with varying frequency according to a given law,

The proposed device provides a smooth change in the frequency of the signals according to predetermined laws, the choice of which is determined by an external device, which expands the functionality and frequency range of the device,

Claims (2)

Claims 1. A variable frequency signal shaping device comprising serially connected pulse generator and frequency divider, code-frequency converter, first decoder, counter, lower code signal output bits which is connected to the first code input of the code-frequency converter, characterized in that, in order to expand the range of output frequencies, the second decoder, the first And element, the inverter and the second And element are entered in series, the other input of which is connected to the code-frequency converter output, while the output of the first the decoder is connected to the second code-converter of the code-frequency converter, and the output of the frequency divider is connected to the input of the second decoder, the code output of the high-order counter bits is connected to the first code input of the first decoder, the output of the first element And is connected to the reset input of the counter, the clock input of which is connected to the output of the pulse generator, another input of the first element And is the control input of the variable frequency signal shaping device, and the second code input of the second decoder is the control code input of the variable frequency signal shaping device. 2. The device according to claim 1, characterized in that the code-frequency converter contains the first, ..., Nth multiplexers, the first, ..., Nth group of resistors, trigger Schmitt, in parallel to the input of which a capacitor is connected, while the outputs of the first N-ro multiplexers are combined and connected to the Schmitt trigger input, with the first terminals of the resistors of each of the N groups of resistors are connected to the corresponding information inputs of the corresponding N N multiplexers, and the second resistor terminals of all groups of resistors are combined and connected to the Schmitt trigger inverse output, the control code inputs of each of the multiplexers are the first code-frequency converter input, which output the inverse output of the Schmitt trigger, and the inputs of the work enable signals of all the multiplexer are combined and are the second code input of the code-frequency converter .