SU843276A1 - Start-stop text distorting device - Google Patents

Description

one

The invention relates to telecommunications and can be used in electrical measuring equipment of a telegraph network for monitoring the correcting ability of receivers and the operation of regenerators.

It is known a device for distortion of starface text, containing the first trigger of a series-connected pulse generator, a start-stop distributor and a second trigger, the outputs of which are connected to the first inputs of the And elements, the outputs of which through the switch are connected to the inputs of an encoder, the outputs of which are connected to the inputs of the delay unit, one input connected to another output of the pulse generator, as well as the driver of the starting modulation moments 1.

However, the known device has a narrow range of input distortion.

The purpose of the invention is the distortion of any start-stop text.

This goal is achieved in that a device for distorting start-stop text containing the first trigger, serially connected pulse generator, start-stop distributor and second trigger, the outputs of which are connected to the first inputs of the And elements, the outputs of which through the switch are connected to the inputs of the encoder, the outputs of which are connected to the inputs of the delay unit, one input of which is connected to another output of the pulse generator, as well as the driver of the significant modulation moments, are introduced an additional element AND ment "prohibition of start-stop with the output of the distributor is connected to a first input of the additional element and an input of the significant moments of modulation and the first input element" prohibition second input and a second input and an additional member connected to the output of the most significant moments modulation output

Claims (1)

5 of an additional element AND is connected to the corresponding input of an encoder, the output of the Inhibit element is connected to the second inputs of the AND elements, the other input of the start-stop distributor and one input of the first trigger are combined and are the device input, the other input of the first trigger is connected to the output of the delay block. FIG. 1 shows the structural electrical circuit of the proposed device; in fig. 2 - diagrams explaining his work. The device for distorting the start-stop text contains a pulse generator 1, a start-stop valve 2, a first trigger 3, two elements 4 and 5, a switch 6, an encoder 7, a delay block 8, a second trigger 9, shaper 10 significant modulation moments, an additional element 11 element 12 "Prohibition. The device works as follows. Any start-stop text (Fig. 2 a), into which distortion must be introduced, is fed to the input of the start-stop distributor 2, which forms an undistorted starting parcel (Fig. 26). The shaper of 10 significant modulation moments generates two short pulses corresponding to the beginning and end of this starting burst (Fig. 2 c) An additional And 11 element selects a pulse corresponding to the beginning of the starting burst (Fig. 2 g), and the 12 "Ban select the pulse corresponding to the end of the starting parcel (Fig. 2 d). In the absence of an external effect at the output of the delay unit 8, pulses appear with a repetition period equal to the nominal duration of the telegraph signal. The impulse corresponding to the beginning of the starting package through; The encoder 7 writes to the delay unit 8 the first binary number, the value of which determines after what time the output pulse of the delay block 8 is the output pulse from among the pulse generator 1 pulses, counted by the delay block 8. This pulse generates the first start transition of the output telegraph combination and determines how long the output signal is delayed relative to the input. When setting the delay of this pulse to a time equal to, for example, half the duration of the elementary parcel, the output telegraph signal will be delayed relative to the input signal for a time equal to half the duration of the elementary parcel. The impulse corresponding to the end of the old product, through the first or second elements of AND 4 and 5 (depending on the state of the flip-flop 9, determining the sign of distortion), and also through the switch 6 and the digit 7 writes to the delay unit 8 the second binary number, the value of which also determines after what time the output pulse at the output of the delay block 8 determines the end of the starting signal of the output telegraph signal. The difference between the first and second binary numbers determines the magnitude of the introduced distortion. All other output pulses of the delay block 8 will be separated from the pulse corresponding to the end of the starting parcel. by an amount multiple to the duration of the elementary parcel (t), since there is no effect on the delay block 8 until the next starting parcel arrives (Fig. 2e). The pulses from the output of delay unit 8 control the operation of the trigger 3, which is set to the state corresponding to the signal received at its information input (Fig. 2g). At the output of flip-flop 9, a distorted signal is generated with a given percentage of distortion. The trigger 9 is controlled at the counting input by the starting signal and changes state with the arrival of each new telegraph combination, allowing the operation of the first and second elements 4 and 5, defining the sign of the distortion. In this case, the sign of the distortion alternates alternately. If it becomes necessary to change the sign of the distortion in a different order, it is possible to control trigger 9 using the installation inputs, or directly control the first and second elements 4 and 5, affecting their first inputs. The proposed device differs from the known one not only in that it does not require additional distortion of the input signal, but also in that the distortion of the output signal does not depend on the distortion of the input signal. This provides an additional opportunity to use the distortionr as a regenerator for correcting (fixing distortion) the input signal. At the same time, a distorted signal is input to the input of the proposed device and to form an undistorted output signal or provide a recording in block 8 of the delay of the second binary number equal to the first number. Or, in general, switch 6 off the record of the second number. The device for distorting start-stop text, containing the first trigger, serially connected pulse generator, start-stop distributor and second trigger, the outputs of which are connected to the first inputs of the And elements, the outputs of which through the switch are connected to the inputs of the encoder, the outputs of which are connected to the inputs of the delay block the input of which is connected to another output of the pulse generator, as well as the generator of significant modulation moments, characterized in that, in order to distort any start of an additional text, an additional element I is entered into it and the element “Prohibition, with the output of the start-stop distributor connected to the first input of the additional element AND, the input of the generator of significant modulation moments and the first input of the element“ Prohibition ”whose second input and second input of the additional element I are connected to the output of the generator of significant modulation moments, the output of the additional element AND is connected to the corresponding input of the encoder, the output of the element "Inhibit is connected to the second inputs of the elements AND, the other the start-stop distributor input and one input of the first trigger are combined and are the device input, the other input of the first trigger is connected to the output of the delay unit. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 663122, cl. H 04 L 11/08, 1977 (prototype). code Out