SU1676109A2 - Former of control signal for compensating "prevalent"- type distortions - Google Patents

Abstract

The invention relates to communication technology and can be used in the receiving part of the equipment for transmitting discrete information to form a correction voltage level. The purpose of the invention is to improve the formation accuracy by taking into account the distortions of adjacent information pulses. The control signal conditioner for dominating type distortion compensation contains element 1, counter 4, converter 7 code — voltage, differentiating block 9, additional differential block 10, element NOT 11 The goal is achieved by introducing an additional element AND 2, element OR 3, additional counter 5, divider 6, block 8 delay, divider 12, trigger 13. Shaper provides the formation of an adequate correction signal regardless of the number of adjacent current parcels. 1 silt

Description

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The invention relates to communication technology, can be used in the receiving part of the equipment for transmitting discrete information to form a voltage correction level and is an improvement of the invention according to the authors. St. ISfc 1092749.

The purpose of the invention is to improve the formation accuracy by taking into account the distortions of adjacent information pulses.

The drawing shows a structural electrical circuit of the proposed driver.

The shaper contains an element AND 1, an additional element AND 2, an element OR 3, a counter 4, an additional counter 5, a divider 6, a converter 7 code - voltage, an 8-delay unit, a differentiating unit 9, an additional differentiating unit 10, the element NOT 11, frequency divider 12, trigger 13.

The shaper works as follows.

At the clock input shaper (one input element And 1) receives a sequence of high-frequency clock pulses. The information input of the imaging unit (the second input of the first element I 1, the differentiating unit 9 and the element NO 11) receives information pulses with a nominal duration TO, with r0 N TWh, where N is the pre-selected ratio (coefficient). Deviations of the nominal duration characterize the magnitude of the predominance in the received elements of the message and the value of the correction (control) signal.

At the time of the change, at the information input of the voltage level of logic O to logic level 1, a short pulse is generated at the output of differentiating unit 9, which sets the counters 4.5 to zero (zero), as well as the divider 12 and trigger 13. At the same time, the voltage level at the output of the converter 7, it remains unchanged, since the code of the number recorded in it before does not change. For a time equal to the duration of the positive signal (a set of adjacent single information parcels) at the information input, AND 1 is open with this signal, and high frequency pulses from the clock input arrive at the output of AND 1 and then to the counting inputs of the counter 4 and divider 12. The contents of counter 4 after the end of this interval are proportional to the duration of the input

positive polarity information signal.

At the output of the element 11, a sequence is formed inversely with respect to the input information signal, which is fed to the input of the differentiating unit 10, from which output a pulse is removed at the time of the change at the information input of the logic level 1 generator to the logic level O (i.e., at the end of the positive information pulse). Thus, an information parcel, the duration of which may be distorted by a predominance, begins with a positive voltage drop (front) and ends with a negative voltage drop. In this case, not one, but several adjacent positive elementary premises can be located between positive and negative differences. In this case, it is necessary to correct the magnitude of the calculated dominance and control signal, depending on the number of adjacent premises.

Suppose that the ratio of the duration of an information package not distorted by dominances to the period of high-frequency clock pulses is equal to N. The division factor of divider 12 is chosen to be equal to this ratio, i.e. N. The signal from the first output of the divider 12 is fed to the input of the installation in the single state of the trigger 13 at the moment when the divider N arrives at the input (signals the end of the undistorted signal). The signals from the second output of the divider 12 are formed at the time points when N + I-N / 2 pulses (I 1.2, ...) arrive at its input, which corresponds to the middle (half) of the undistorted message. If an undistorted message must have a duration t0, then when an information signal arrives at the input of the information signal with a duration in the range from 0 to 1.5 0, the decision is made to receive a single message, while the duration of the incoming signal from 1.5 to 2.5 T0 is taken the decision on the arrival of two adjacent positive parcels, etc. In general, when the duration of the received signal is in the range from (1-0.5) then to 0 + 0.5) - r0, where 1 1.2

a decision is made to enter a 1-fold adjacent positive package to the information input.

If the duration of the received positive signal is less than T0, then when a negative front arrives at the information input from the output of differentiating unit 10, the signal goes to one input of the OR element 3 and from its output further to the counting input of the counter 5, which goes to state 1 (one in the youngest raz de). The same pulse with a certain delay, passed through block 8, resets the number stored in converter 7 by the leading edge, and the falling edge records to the converter 7 of the new number generated by this time at the output of the divider 6. At the inputs of the divider the outputs of counter 4 receives the code of the number of high frequency pulses recorded in the interval of the positive input signal at the information input of the driver, and the inputs of the divider 8 from the counter 5 receive the code of the number representing the number of adjacent positive x parcels. From the output of divider 6, the quotient from dividing the numbers recorded respectively in counters 4.5 is removed in the form of a code, which is recorded as a new code of the number in converter 7. When a decision is made about the arrival of a single send of the information signal (counter 5 contains the code of number 1 as described above) the shaper operates similarly to the prototype device.

If during the first t0 the negative edge of the information signal did not arrive, then the signal from the first output of divider 12 (at the moment when the divider of the N-th pulse arrives at the input) is set to one state by trigger 13, preparing an account of the number of adjacent premises in the absence of negative front of the information signal. Further, the signals from the second output of the divider 12 (which are formed, as indicated above, at the moments of arrival

N -I- - pulses (i 1,2, ...), corresponding to the middle of the next parcels — the second, third, etc., pass through the AND 2 element (now to its second input there is an enable signal from the output of the trigger 13 ) and through the element OR 3 to the counting input of the counter 5. Turning on the trigger 13 is necessary in order to prevent the first signal from the output of the (second) divider 12 from being counted by the counter 5.

Thus, by the time the negative front arrives at the information input of the driver, which marks the end of the package (or a set of adjacent: n, information packages), counter 4 contains the code for this package (or set), and

and the number of parcels in the aggregate. The divider 6 divides the contents of the counter 4 into the contents of the counter 5, and the quotient from this division represents

is a code corresponding to the duration distortion, arriving at one elementary parcel.

In the absence of dominance at the output of the driver (namely, the converter code - voltage), a certain unchanging signal is established, independent of the number of adjacent information packages. In the case of the entrance to the input of the pulser pulses (parcels),

characterized by current prevalence (lengthening-, positive intervals due to negative), upon their termination at the output of converter 7, a voltage level is established that is greater in magnitude than for undistorted packages. In the case of currentless prevalence, the output of the converter 7 sets the level of the analog signal, which is lower in magnitude than the level of the undistorted signal. Thus, the deviations of the output signal level from a certain nominal value characterize the sign and magnitude of the predominance, as a result of which this signal

It can serve to correct the prevalence in the transmission of useful information over communication channels.

At the same time, unlike the prototype, the proposed shaper provides

the formation of an adequate correction signal regardless of the number of adjacent current parcels (it is for current parcels that the correction signal is formed), since

bringing the output signal to one elementary current parcel regardless of their number, as described above.

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Claims (1)

Invention Formula Shaper control signal to compensate for the distortion of the type of predominance of ed. St. No. 1092749, characterized in that, in order to improve the shaping accuracy by taking into account the distortions of adjacent information pulses, a divider, a delay unit, an additional counter, a frequency divider, a trigger, an additional AND element and an OR element are entered into it, and the counter outputs are connected to the information inputs of the converter code - voltage through a divider, the output of the additional differentiating unit is connected to the reset input of the converter voltage code through the delay unit, the output element And is connected to the information m input of the frequency divider, the reset input of which, the reset input of the trigger and the counting input of the additional counter are connected to the output of the differentiating unit, the first output of the frequency divider is connected to the setup input of the trigger, the output of which is connected to the first input of the additional And element, the second input and output of which are connected respectively to the second output of the frequency divider and the first input of the OR element, the second input of which is connected to the output of the additional differentiating unit, the output of the OR element is connected to the reset input of the additional counter, the outputs of which are connected to the installation inputs of the divider.