RU2030115C1 - Electronic key of morse code - Google Patents

Abstract

FIELD: radio engineering. SUBSTANCE: electronic key has manipulator 1, NOT-AND gates 2, shift register 3, clock pulse generator 5, resistor 6, inverter 7. EFFECT: enhanced operational stability. 2 dwg

Description

 The invention relates to telegraph communication and can be used to generate telegraph signals with Morse code.

 Known automatic telegraph key containing a manipulator, a clock, two flip-flops, four two-input AND-NOT elements and two inverters [1]. A Morse code electronic key is also known, which contains a manipulator, a clock pulse generator, a shift signal shaper, two memory blocks and a sign element generating unit [2].

 The disadvantages of these devices are the possibility of the disappearance of the elements of the sign and great complexity.

 The closest in technical essence to the proposed device is a Morse code electronic key selected as a prototype [3], which contains a manipulator, a clock pulse generator, two OR elements, a sign element generating unit, a shift signal generator, and two memory blocks, and the sign element forming unit contains two triggers and an OR element, and each memory block contains two OR elements, a shift register, and two AND elements.

 The disadvantage of such a device is its complexity.

 The aim of the invention is to simplify the device by reducing the number of functional blocks.

 The goal is achieved by the fact that in the electronic key of the Morse code containing the manipulator, the clock pulse generator and the shift register, the first information input of which and the first output of the manipulator are connected to the common bus, and the second information input of the shift register is connected to the signal source of the logical unit, two elements are introduced AND NOT, the element NOT and the resistor, the first output of which is connected to the common bus, and the second - with the input of the element NOT and the output of the shift register, the first and second control inputs of which are connected to the outputs, respectively but the element NOT and the first element AND NOT, the first input of which is connected to the second output of the manipulator and the third information input of the shift register, the fourth information input, the input of the serial input and the clock input of which are connected respectively to the signal source of the logical unit, with the common bus and the output of the second the NAND element, the inputs of which are connected to the output of the clock generator and the output of the first NAND element, the second and third inputs of which are connected respectively to the third output of the manipulator and the first mu control input of the shift register, the output of which is the output of the key.

 In the proposed device, in the same shift register, depending on the position of the manipulator, either a dash code or a point code is written, which are then read, forming the output characters. In this case, there are no distortions of the code elements, and the device is greatly simplified.

 In FIG. 1 is a diagram of an electronic key for a Morse code; in FIG. 2 - diagrams explaining the principle of operation.

 The electronic key of the Morse code (Fig. 1) contains a manipulator 1, the first output of which is connected to a common bus, and the second and third outputs are connected respectively to the first and second inputs of the AND-NOT 2 element, the output of which is connected directly to the read enable input of shift register 3 directly and to the clock input - through the AND-NOT 4 element, the second input of which is connected to the output of the generator 5 clock pulses (GTI). The serial input and the first information input of the shift register 3 are connected to the common bus, the second and fourth information inputs are connected to the logic unit signal, the third information input is connected to the second output of the manipulator 1. The fourth digit output of the shift register 3, which is the key output, is connected through the resistance 6 with a common bus, and through the inverter 7 with the input of the shift register 3 mode selection and with the third input of the AND-NOT 2 element.

 The second and third conclusions of the manipulator 1 through the resistance can be connected to a power source to guarantee the level of a logical unit at the inputs of the AND-NOT 2 element with the contacts of the manipulator 1 open.

In FIG. 2 presents the following diagrams:
a - pulses at the output of the generator 5 pulses;
b - pulses at the output of the AND-NOT 4 element;
c, d, d - signals, respectively, at the first, second and third inputs of the AND-NOT 2 element when the manipulator is turned on in the right position on the interval (t ₁ , t ₂ ) and in the left position - on the interval (t ₃ , t ₄ );
g, h, and - the signal at the outputs of the second, third and fourth (device output) bits of the shift register.

 The electronic key of the Morse code works as follows.

 In the average position of the manipulator 1 (initial position), the voltage at the output of the device is logical zero, therefore, at all inputs of the AND-NOT 2 element, the potentials are equal to the level of a logical unit, and at the output of AND-NOT 2 the voltage is zero. Shift register 3 is in the third (off) state (high-resistance output), that is, the potential at the output of register 3 is determined by the relatively low-resistance resistance 6 and is close to zero. The pulses from the output of the 5 pulse generator (Fig. 2a) do not arrive at the clock input of the shift register 3 (Fig. 2b), since the voltage is zero at the second input of the AND-NOT 4 element.

At time t _{1, the} manipulator 1 is translated into the right position - “dash” (Fig. 2a), the logical unit level appears at the output of NAND 2 (Fig. 2e), the shift register 3 is switched to the on (working) state, at the output fourth digit (key output) remains the potential of logical zero (Fig. 2i), therefore, at the time of arrival of the first clock in the interval (t ₁ , t ₂ ), register 3 is in parallel recording mode. This pulse records the logical zero in the first digit, and the logical one in the second, third and fourth digits (Fig. 2g, 2z, 2i). At the output of the key, the level of the logical unit appears, through the inverter 7 this signal is fed to the input of the mode selection and puts register 3 into the sequential mode. With each clock pulse, the units are shifted in register digits. The fourth pulse sets the logic zero level at the output of the key, which puts register 3 into parallel write mode. The fifth pulse, like the first, writes to the register the number set on the information inputs. The formation of an elongated package is repeated, although the contacts of the manipulator 1 opened at time t ₂ , that is, until the end of the package (Fig. 2c). Blocking was carried out by the signal itself (Fig. 2e).

At time t _{3, the} manipulator was in the left position corresponding to the formation of points. In this case, at the end of the pause, a number is written to the register, but a logical zero is written to the third digit (Fig. 2h), so the pulse duration turns out to be equal to the pause duration. While the key is held in the left position, the formation of points continues.

At time t _{4, the} manipulator returns to the middle position, the duration of the point is maintained, even if time t _{4 is} in the interval of the point. Immediately at the end of the GTI point 5, it is blocked by a signal from the input AND-NOT 4 (Fig. 2e). In the fourth category of register 3, a logic zero level appears (Fig. 2i), register 3 switches to the third state, but the logic zero level, which is determined by resistance 6, is stored at the output of the key. After the formation of two dashes and two dots, the key is in the initial state.

 In the proposed device, distortions and disappearance of the sign elements are excluded, since the manipulator signal controls the inclusion of the clock pulse generator and does not directly go to the synchronization input of the shift register. Therefore, the "bounce" of the manipulator does not create false shifts in the register and does not disrupt the operation of the key.

 The proposed electronic key of the Morse code is much simpler than the prototype and well-known analogues. For its implementation, two chips are sufficient (excluding the GTI).

Claims (1)

 The Morse Code electronic key, comprising a manipulator, a clock and a shift register, the first information input of which and the first output of the manipulator are connected to a common bus, and the second information input of the shift register is connected to a signal source of a logical unit, characterized in that, for the sake of simplification, by reducing the number of functional blocks, two AND elements are introduced - NOT, an NOT element and a resistor, the first output of which is connected to a common bus, and the second - with the input of the NOT element and the output of the shift register, the first and second unit the branching inputs of which are connected to the outputs of the element NOT and the first element AND are NOT, the first input of which is connected to the second output of the manipulator and the third information input of the shift register, the fourth information input, the input of the serial input and the clock input of which are connected respectively to the signal source of the logical unit, with a common bus and the output of the second element AND - NOT, the inputs of which are connected to the output of the clock generator and the output of the first element AND - NOT, the second and third inputs of which are lyucheny respectively to the third output of the manipulator and the control input of the first shift register, whose output is the output key.

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