JPH03141755A - Data transmitter, data receiver and data exchange system - Google Patents

Abstract

PURPOSE:To execute data exchange by providing the transmitting data input means of a binary signal, data converting means, violence bipolar pulse preparing means, transmission pulse preparing means and decoding means. CONSTITUTION:Transmitting data are inputted to a terminal 1 and shifted from an FF4 to an FF9 by the CP of a terminal 2. When the number of continuous '0' from a 6-input AND gate 10 is M, a signal train with 'H' (M-6+1)t interval is obtained. A converting circuit 11 converts only a (6n+1)th signal to the 'H' signal and inputs the signal through FF12-14 to a logic circuit 15 and six AND gates are controlled by the inverted pulse from the CP of the terminal 2. Then, the signal is applied through OR gates 17 and 18 to FF 19 and 20 and driven by the inverted pulse from the CP of the terminal 1. The bipolar pulse including a violence bipolar pulse train is outputted to a terminal 23 by a pulse driver 22. This pulse is received by a receiving means 25 and an output is inverted. Then, the CP is extracted and the violence bipolar pulse is removed through a prescribed decoding circuit 38 to obtain reproducing data. Thus, read error is not generated by the existence of the violence pulse.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to a data transmitting device, a data receiving device, and a data transmitting/receiving method that can accurately transmit and receive transmission data, and particularly relates to a data transmitting and receiving method that can accurately transmit and receive transmission data. This is intended to reduce the influence of pulse waveform distortion and periodic fluctuations on accurate pulse transmission on the line.

(b) Prior Art FIG. 6 shows an extracted portion of the pulse transmitting/receiving circuit shown in FIG. 1 of Japanese Unexamined Patent Publication No. 63-18848. The operation of this pulse transmitting/receiving circuit will be explained with reference to waveform diagrams shown in FIGS. 7 and 8.

An input terminal 61 receives transmission data a consisting of a combination of a binary signal rQJ and "1", and an input terminal 62 receives a tarokk b. These signals are converted into pulses shown in FIG.
7. Input to the base terminal of the negative polarity driver 68. Each driver is turned on when a high level is input. 69 is a transformer that separates the transmission line 70 and the transmitting circuit, the center tap of the primary coil is connected to the power supply, and both ends of the secondary coil are connected to the collectors of the drivers 67 and 68. . driver 67
．． When the transformer 68 is turned on, a current flows through the primary coil of the transformer 69, a waveform as shown in FIG. 7f is induced on the secondary side, and a bipolar pulse is transmitted to the transmission line 70. The characteristics of this bipolar pulse are that when it is a binary signal "1", there is no pulse, and when it is an "O" signal, it is a series of positive and negative pulses with equal half-cycle pulse width and equal amplitude. This corresponds to the following. 71 is a transformer that separates the transmission line and the receiving circuit, one end of the secondary coil is connected to the power supply, and the other end is connected to the non-inverting input terminal (+) of the comparator 76 via resistors 72 and 73. It is connected to the. When the bipolar pulse is input to the primary side of the transformer 71, a waveform shown in FIG. 8g is input to the non-inverting input terminal of the comparator 76. Here, 80 is a ground level, and 79 is a level that is half the power supply level when the resistances 72 and 73 are equal. 81 is a reference level of the inverting input terminal (-) of the comparator 76 obtained by dividing the power supply level with resistors 74.75, and when the input level of the non-inverting input terminal is lower than this level 81, the output of the comparator 76 is When pulled up by the resistor 77, the output terminal 78 becomes a low level, and the waveform is shaped as shown in the eighth diagram to restore the original binary signal. transmission line 7
When driving a bipolar pulse to 0, ideally the waveform on the transmission line should be as shown in Figure 7e, but in reality the inductance of the transformer 69.71 takes a finite value, so it is as shown in Figure 8g. The undershoot shown by 82 is
Appears when both drivers 67, 68 are turned off. This undershoot becomes larger as the inductance decreases, and in order to suppress the undershoot, it is necessary to increase the size of the transformer.

However, the feature of the circuit in Figure 6 is that this undershoot appears only on one polarity side, as shown in Figure 8g, and the polarity changes alternately each time a "0" signal as shown in Figure 9 arrives. Bipolar pulse (A
The undershoot does not appear alternately in both polarities as in the MI pulse). Furthermore, in the bipolar pulse shown in Figure 8g, the amount of energy stored in the core of the transformer 69.71 is small because the positive and negative pulses cancel each other out, and is not as large as in Figure 9, so the undershoot can be reduced. . If the undershoot appears in only one polarity in this way, the inverting input terminal level 81 of the comparator 76 can be easily brought close to the no-pulse level 79, and waveform shaping that is not affected by the undershoot becomes possible, resulting in good pulse transmission. realizable.

However, in the circuit shown in FIG. 6, if the "1" signal continues for a long time, the sending of pulses from the transmitting side will stop during that period. If the receiving circuit operates by extracting the clock from the incoming pulses, the disadvantage of Figure 6 is that if this happens, a reading error will occur when the pulses are sent again. .

(c) Problems to be Solved by the Invention In the circuit shown in Fig. 6, when the rlJ signal continues for a long time as described above, the sending of the pulse stops, the extraction of the clock on the receiving side stops, and when the pulse arrives again, the circuit reads the signal. The problem is that errors occur. This also applies to a circuit that makes a "0" signal correspond to a non-pulse state. It is an object of the present invention to solve the problems associated with non-sending of pulses, which causes tarock extraction to stop.

(d) Means for Solving the Problems The first invention includes an input means for receiving transmission data consisting of a combination of a 21fh signal "0" and rlJ, one of the transmission data corresponds to a non-pulse state, and the other a data converting means for making the data correspond to a continuous bipolar pulse of a positive polarity pulse and a negative polarity pulse of equal amplitude having a pulse width of a half period of the transmission bit rate; It has a high-hola pulse creation means and corresponds to a non-pulse state. One transmission data is a predetermined number N (N is 2
and a means for adding a biolens bipolar pulse from the violent bipolar pulse generating means to the bipolar pulse from the data converting means to form a transmission pulse when the number of consecutive pulses is greater than or equal to an integer greater than or equal to an integer. A second aspect of the present invention is a data transmitting device, comprising: a receiving means for receiving a transmitted pulse including a bipolar pulse and a violent spipolar pulse;
A third aspect of the present invention is a data receiving apparatus, characterized in that it is equipped with a decoding means for removing and restoring transmission data based on the bipolar pulse. One of the transmitted data corresponds to a no-pulse state, and the other corresponds to a continuous positive pulse and negative pulse of equal amplitude with a pulse width of half the transmission bit rate. A biolens bipolar pulse that corresponds to a bipolar pulse and can be distinguished from the bipolar pulse corresponds to a non-pulse state.When one transmission data is a predetermined number N or more (N is an integer of 2 or more) or more, the bipolar pulse corresponds to the bipolar pulse. a process of adding and transmitting pulses to form a transmit pulse and transmitting the transmit pulse; and a receiving process of receiving the transmit pulse, identifying and removing violent bipolar pulses from the transmit pulse, and restoring transmitted data based on the bipolar pulses. This is a data transmission/reception method characterized by the following.

(E) Operation The data transmitting device, data receiving device, and data transmitting/receiving method of the present invention all operate when one transmission data corresponding to a non-pulse state continues for a predetermined number N (N is an integer of 2 or more) or more. Since the biolens bipolar pulse is added to the bipolar pulse, there is no longer a state where the pulse is not sent, and the clock extraction of the receiving circuit is always performed, so that reading errors do not occur. In addition, since the violent bipolar pulse can be distinguished from the binary signal pulse, it can be easily removed on the receiving side, allowing accurate signal transmission.

(F) Embodiment An embodiment of the present invention will be explained based on the drawings. FIG. 1 is a circuit diagram of an embodiment of a data transmitting device. FIG. 2 is a circuit diagram of one embodiment of the data receiving device. 3 and 4 are time charts of the circuit configuration of FIG. 1. FIG. 5 is a time chart diagram of the circuit configuration of FIG. 2.

In this embodiment, a pulse is generated when the binary signal is "1", and when N (for example, N = 5) or more "0" are input continuously, a biolens bipolar pulse is generated. ,
This will be explained as something added to the bipolar pulse.

■ is a lock input terminal for inputting tarock pulses (Fig. 3A), 2 is a clock input terminal for inputting clock pulses (Fig. 3B), and 3 is a combination of binary signals "0" and "l". It is an input means for receiving transmission data (FIG. 3C). Clock A is used to send out bipolar pulses, and clock B is obtained by dividing clock A once, and its clock frequency is made equal to the transmission bit rate of the transmitted data. And the transmission data is clock B
is synchronized with.

Numerals 4 to 9 are N D-type flip-flops (FF) that shift the transmission data C input to the input means 3 from the left to the right in the figure using the clock B. consecutive N
When a string of ``O'' signals or more is input from the input means 3, and rQJ at the beginning of the string appears at the Q output terminal of the D-type FF 9, the output of the N-input AND gate 10 becomes high. Then, if the number of consecutive "O"s input to the input means 3 is M, the output of the AND gate 10 remains high for (M-N+1)t<(1 is equivalent to one cycle of clock B) time). The circuit 11 outputs 1, N+1.2N+11 of such continuous high signal strings for (M-N+1) clocks.
A circuit that holds only the nN+1 (n is 0 or a natural number) high state and converts the rest to low, and includes a Nant gate 111, a counter 112, a comparison 5113, and an AND gate 114.

FIG. 4 is a time chart showing the operation of the conversion circuit 11 in the embodiment where N=5. This is an example where 12 consecutive "0" signals are input to the input means 3, and the 5-man-powered ANDG) 10 output continues to be high for 12-5+1=8t, like K.

When the waveform K rises (115), the clear terminal of the counter 112 falls to low (116 of the waveform) and the counter starts counting the clock b (the number in O of the waveform represents the count number X).

When x=5 is counted (117 of waveform O), comparator 1
The x+N output terminal of 13 falls to low (1 of waveform P
18), thereby the clear terminal of the counter rises to high (119 of the waveform), and the count returns to x=O (12O of the waveform O). As a result, the x-#N output terminal rises to high (121 of waveform P), thereby causing the clear terminal of the counter to fall to low (waveform LL near) 122) and starts counting again. The X=0 output terminal of the comparator is in a low state (waveform Q) when the count number becomes.

FIG. 3 is a time chart for explaining the operation of the data transmission device shown in the $1 diagram when N=5.

When seven consecutive "0's" are input from the manual means 3 as in the transmission data C, the output of the five-manual AND gate 10 remains high for 7-5+1=3t as shown in the waveform. When this signal K is input to the conversion circuit 11, the conversion circuit outputs the signal R after undergoing the above-mentioned conversion. This signal R is input to the D-type FF 12, 13, 14, and shifted from left to right in the figure by taro clock b to obtain signals with waveforms S, T, and U.

The logic circuit 15 including six AND gates is a D type F
Q terminal output signal H of F9 and the above D type FF12.1
3. Input the terminal output signals S, T, tJ of 14, the clock B from the clock input terminal 2, and the clock B obtained by inverting this clock 100 by the inverter 16.
, the third and fourth AND gates 15a, 15c, and 15d output the first group's output signals I, V, and W, and the second, fifth, and sixth AND gates 15b, 15e, and 15f output the second group's output signals. It is configured to output output signals J, X, and Y.

Output signals of the first group from the logic circuit 15 1. V and W are added by the OR gate 17, and the addition output (waveform Z in Figure 3)
is input to the D type FF 19. In addition, the logic circuit 15
The output signals J, X, and Y of the second group are added by the OR gate 18, and the added output (waveform AA in FIG. 3) is input to the D type FF 20. Each D-type FF 19.20 is driven by a clock N obtained by inverting the clock A from the clock input terminal 1 by an inverter 21, and these act to correct the timing deviation of the output of the OR game) 17.18. Each output signal Z from OR gate 17.18
, AA halves the pulse width of the output signal from the D-type FF9.12.13.14. The bipolar pulse drive circuit 22 is a circuit 67.6 shown in FIG.
8.69, and a bipolar pulse AB including a biolens bipolar pulse train 231 is obtained from the output terminal 23.

Comparing the bipolar pulse 232 based on transmission data and the violent bipolar pulse 231, focusing on the pulse train of one of the polarities (for example, positive polarity),
The interval between adjacent pulses of the former biolens bipolar pulse 232 is an even number times the cycle of clock A as one unit, whereas the interval between adjacent pulses of the latter biolens bipolar pulse 231 is an odd number multiple. These pulses 231, 232 are therefore distinguishable from each other.

Next, a data receiving device that receives transmission pulses transmitted from the data transmitting device through a transmission line will be described. The receiving means 25 including the input terminal 24 for receiving the bipolar pulse AB is substantially the same as that described in connection with FIG. 6, and the waveform AC of FIG. 5 is input to the non-inverting input terminal of the comparator 26. do. Here, 261 is the earth level,
262 is a level that is half the power supply level, and 263 is a reference level of the inverting input terminal of the comparator. The output terminal of this comparator is pulled up and inverted by an inverter 27 to obtain an output signal AD. This signal AD is input to a clock extraction circuit 28, which outputs a clock AE corresponding to the clock A and a clock AL corresponding to the clock B.

The signal AD is input to decoding means 38 having means for removing the biolens bipolar pulses. This decoding means 38 includes a D type FF 29 which receives the input signal AD and shifts it from the left to the right in FIG. 2 using the clock AE.
Contains ~32. When a violence pulse train based on a violent bipolar pulse is input, the Q terminal outputs of the D-type FFs 29, 30, 31, and 32 may be arranged in the order of high, low, low, and high, respectively. At this time, the output of the four-man power AND gate 34 becomes low like the signal AK, and the data input terminals of the D type FFs 30, 33 are forced to become low by the two-man power AND gates 35, 36. As a result, the output terminal of the AND gate 36 receives an output signal AJ containing the transmission data obtained by removing the biolens bipolar pulse from the bipolar pulse AC received by the receiving means 25 and converted into unipolar data.
is output. Upon receiving this output signal AJ, the clock AL
The D type FF 33 driven by
Output M.

It is recognized that the invention related to the data transmission/reception system can be easily understood by those skilled in the art by referring to the above explanation regarding the data transmitting device and the data receiving device, so further explanation will be omitted.

(g) Effects of the Invention The present invention is advantageous in that, as shown in the waveform AC in FIG. As a result, undershoot appears only on one polarity and not on the other polarity, making it possible to shape the waveform unaffected by undershoot.Furthermore, due to the presence of the violence pulse, there is always a clock on the receiving side. It has the advantage that reading errors do not occur because the information is sent.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment of a data transmitting device according to the present invention. FIG. 2 is a circuit diagram of an embodiment of the data receiving device. 3 and 4 are time charts of the circuit configuration of FIG. 1. FIG. 5 is a time chart diagram of the circuit configuration of FIG. 2. FIG. 6 is a circuit diagram of a conventional data transmitting/receiving device. FIG. 7 is a time chart on the transmitting side of FIG. 6. FIG. 8 is a time chart diagram of the receiving side circuit of FIG. 6. FIG. 9 is an AMI pulse waveform diagram. 3... Input means, 4-9, 15a, 15b, 17-2
0...Data conversion means, 10-14.15c-15f
, 17-20...Biolens bipolar pulse creating means, 22...Transmission pulse forming means, 25...Receiving means, 38...Decoding means.

Claims (3)

[Claims] (1) An input means for receiving transmission data consisting of a combination of binary signals "0" and "1", one of the transmission data corresponds to a non-pulse state, and the other has a pulse width of half the period of the transmission bit rate. a data converting means for generating a continuous bipolar pulse of a positive polarity pulse and a negative polarity pulse of equal amplitude; a biolens bipolar pulse generating means for generating a biolens bipolar pulse that can be distinguished from the bipolar pulse; When one of the matched transmission data continues for a predetermined number N (N is an integer of 2 or more) or more, a violent bipolar pulse from the violent bipolar pulse generating means is added to the bipolar pulse from the data converting means and transmitted. A data transmitting device comprising: means for forming a pulse. (2) A receiving means for receiving a transmission pulse including a bipolar pulse and a violent bipolar pulse, and a decoding means for identifying and removing the violent bipolar pulse from the transmission pulse and restoring the transmission data based on the bipolar pulse. A data receiving device characterized in that: (3) Receiving transmission data consisting of a combination of binary signals "0" and "1", one of the transmission data corresponds to a non-pulse state, and the other has a pulse width of half the period of the transmission bit rate. A biolens bipolar pulse that corresponds to a continuous bipolar pulse of a positive polarity pulse and a negative polarity pulse of equal amplitude and can be distinguished from the bipolar pulse,
The transmission data of one side corresponding to the non-pulse state is a predetermined number N.
(N is an integer of 2 or more) or more, a process of adding it to the bipolar pulse to form a transmission pulse and transmitting this transmission pulse, and a process of receiving this transmission pulse and generating a violent bipolar pulse from the transmission pulse. identification·
A data transmission/reception method comprising: a receiving process for removing the bipolar pulse and restoring transmitted data based on the bipolar pulse.