SU1113898A1 - Frequency-shift keyer - Google Patents

Abstract

A FREQUENCY MANIPULATOR containing a memory unit, serially connected digital-to-analog converter and a smoothing filter whose output is the output of the frequency manipulator, and a reference oscillator whose output is connected to the input of the distributor, in order to simplify the frequency manipulator by eliminating the register shift, adder and reduction of the number of memory blocks; a controlled divider, keys and a trigger, output- are entered into it; which is connected to one input of a D / A converter, the other inputs of which are connected to the outputs of the memory unit, to the inputs of which are connected the outputs of the keys, the first inputs of which are connected to the outputs of the distributor, and the output of the controlled divider is connected to the second inputs of the switches, the signal input of which is connected with the output of the reference oscillator, with the corresponding output of the distributor III being connected to the trigger input, the control inputs of the controllable divider are the inputs of the frequency knob.

Description

eleven

The invention relates to telecommunications engineering and can be used in discrete information transmission systems.

A frequency manipulator is known that contains a reference oscillator, the output of which is connected to the first input of a controlled divider hour, the output of which through a distributor is connected to the inputs of a functional sinusoidal signal converter, the output of which is connected to a smoothing filter, a control unit that specifies the division ratio of the control to the first divider , a phase shifter and a switch, the control input of which is connected to the output of the control unit, while the output of the function converter of sinusoidal signals is ithout phase shifter is connected to the signal inputs of the switch, whose output is connected to the input of the smoothing filter, and the control unit output is connected to the control inputs of the controllable frequency divider tO

A disadvantage of the known frequency manipulator is the complexity and unreliability due to the use of an analog phase shifter.

The closest to the proposed technical entity is a frequency manipulator containing memory blocks, serially connected digital-to-analog converter and a crawling filter, the output of which is the output of the frequency manipulator, and a reference oscillator, the output of which is connected to the distributor input, as well as shift register and cous {mater, the output of which is connected to the input of a digital-analogue converter, while the outputs of the distributor are connected to the first inputs of the memory blocks and the input of the shift register, the outputs otorrhea connected to the inputs of the adder 2.

However, this frequency manipulator is complex.

The purpose of the invention is to simplify the frequency manipulator by eliminating the shift register, the adder, and reducing the number of memory blocks.

To achieve this goal, a frequency manipulator containing a memory block, serially connected digital-to-analog converter and a filtering filter, the output of which is the output frequency 11 O1 h

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keypad, and the reference generator, the output of which is connected to the distributor input, are entered into a controllable divider, keys and a trigger, the input 5 of which is connected to one input of the D / A converter, the other inputs of which are connected to the outputs of the memory block, to the inputs of which the outputs of the keys are connected,

10 first inputs of which are connected to the outputs of the distributor, and to the second inputs of the keys the output of the controlled divider is connected, the signal input of which is connected to the input of the reference

15 of the generator, while the corresponding output of the distributor is connected to the trigger input, the control inputs. The controlled divider are the inputs of the frequency manipulator.

20 The drawing shows a structural electrical circuit of the proposed frequency manipulator.

Frequency manipulator contains reference oscillator I, distributor

25 2, controlled divider 3, keys 4.1-4p memory block 5, digital-to-analog converter 6, trigger 7, smoothing filter.8.

Frequency manipulator works

3Q as follows.

Pulses from the reference generator

1 enter the distributor 2 and the clock input of the controlled divider 3. At the outputs of the distributor

2, pulses appear alternately, and after appearing at the extreme output of the distributor 2, I shift these pulses from in the opposite direction to the other extreme exit, alternately opening the corresponding keys

4. 1. .. A. 2,. .four. P . From the output of the controlled divider 3, the division factor of which is established by the code arriving at the input of the frequency manipulator to the second inputs of all the keys 4. I ,. . .four. 2,. .4n At the moment of time, meek pulses are received. The simultaneous presence on both inputs of one of the keys 4., 4.2, ... pulses from the output 50 of the distributor 2 and from the output of the controlled divider 3 results in reading the corresponding code word from memory 5. This word enters the digital-analogue transform 55 gel 6, from the output of which the signal is transmitted through the smoothing filter B to the output of the frequency manipulator. At the same time, the sign counts down E11

positive or negative is generated by trigger 7 in the following way. A pulse from the first output of the distributor 2, which corresponds to the initial readout of the formed signal stored in memory block 5, the trigger 7 is set to state 1 (or O) and thereby sets a certain sign of the samples at the output of the digital-to-analogue converter 6 of the formed signal, for example the state of the trigger 1 is plus, and in the state O minus. After the next occurrence of the pulse at the first output of the distributor 2, i.e. when a half-period of a sinusoid of the signal being formed is formed, the trigger 7 changes the state to the opposite 0 1 or 1) and accordingly, the sign (. polarity) of the samples of the signal being formed changes.

Thus, changing the coefficient-. The dividing point of the controlled divider 3 can be controlled by the addresses at which counts are read out from memory block 5, which leads to a change in the frequency of the generated signal.

In block 5 of memory, a quarter of the sinusoid period is recorded with the minimum necessary step.

The use of the new elements of a controlled divider, a set of keys and a trigger favorably distinguishes the proposed frequency manipulator from the prototype, as it allows to reduce the size of the memory block by 4 n times, which greatly simplifies the manipulator. On the other hand, maybe 8984

it is possible to increase the accuracy of the signal form by 4 n times with the volume of the memory block the same as in the prototype.

The main indicator of the base object of the IA-011 signal converter, PNO2, 131.092, is the formation of a frequency-manipulated signal by analog methods in the higher frequency range with the subsequent transfer of the spectrum to the frequency band allotted to the channel.

Compared with the base object, the proposed manipulator allows to generate a frequency-controlled signal many times, mainly by elements of discrete technology directly in a given frequency band.

The frequency manipulator in the base object has an average time between failures and hours. The average time between failures of the proposed manipulator and is estimated as follows. Considering that the failure of any element leads to the failure of the whole yanipulator, we determine the failure rate of the proposed manipulator, which is equal to the sum of the failure rates of the elements

0i

where jL is the intensity of failures of elements of type g; 5 u - the number of elements of the i-th

type

Data on the failure rate of the elements given in the table.

Microcircuits

Capacitors

Quartz resonator

Connector

Rations

0.2

0.3

0.2

0.02

0.75

} 1113898.

From the following expression we see. Thus, the proposed

that l i l7 10 1 / the frequency manipulator has adj j, a / iU 1 / 4.measuredly 8.6 times the average mean time between failures. groundwork

The proposed manipulator is equal to the comparison with the base sample. -bi- -J-irrr, - - 69,000 hours

Claims (1)

A FREQUENCY MANIPULATOR containing a memory block, a digital-to-analog converter and a smoothing filter in series, the output of which is the output of the frequency manipulator, and a reference generator, the output of which is connected to the input of the distributor, characterized in that, in order to simplify the frequency manipulator by eliminating the shift register, adder and reducing the number of memory blocks, it introduced a controlled divider, keys and trigger, output ·; which is connected to one input of the digital-to-analog converter, the other inputs of which are connected to the outputs of the memory block, to the inputs of which the outputs of the keys are connected, the first inputs of which are connected to the outputs of the distributor ^ the output of the controlled divider is connected to the second inputs of the keys, the signal input of which is connected to the output of the reference generator, the corresponding output of the distributor is connected to the input of the trigger, the control inputs of the controlled divider are the inputs of the frequency manipulator. £ 1 over & 1 II