JPS60107938A - Multiplexing method of binary signal - Google Patents

Abstract

PURPOSE:To eliminate the need to transmit a synchronizing signal and to eliminate the time up to when synchronism is obtained and a step out by using a pulse signal which has a shorter period than a binary signal and a small cycle. CONSTITUTION:A pulse oscillator 25 generates the small-duty pulse signal, which is ANDed with a binary signal A by an AND gate 24, whose output is ORed with a binary signal A by an OR gate 23; and the pulse component from the pulse oscillator 25 is removed by a low-pass filter 27 and the waveform of the resulting signal is shaped by a waveform shaping circuit 28. Further, the signal is differentiated by a differentiating circuit 29 and ANDed with the output of a monostable multivibrator 30 by an AND gate 31 and a monostable multivibrator 32 regenerates the binary signal B.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a method for multiplexing two binary signals on a binary coded transmission path.

(Background Art) An example of a conventional multiplexing method is shown in FIG. When multiplexing two binary signals A and B using this method, the selector 4 is switched for each of the binary signal numbered 8 input terminal 1, the binary signal B input terminal 2, and the synchronization signal generation circuit 3. Each state is transmitted via the binary coding transmission line 5 at the assigned time. Then, on the receiving side, binary signals A and B are identified according to the logic of the D-friazo flop 6.7 according to the synchronization signal detection circuit 8, and the respective signals are realized at the output terminal 9 or 10. It has become. However, in such conventional multiplexing methods, each state is transmitted at the allocated time as described above, so a synchronization signal for identifying each allocated time must also be transmitted. There was a drawback.

(Problems to be solved by the invention) The present invention has been made to eliminate the above-mentioned drawbacks, and its purpose is to provide a binary code multiplexing method that does not require the transmission of synchronization signals. Explain.

(Structure and operation of the invention) FIG. 2 is a block diagram of an embodiment to which the method of the invention is applied, and FIGS. 3(,) to (f) are time charts thereof.

In FIG. 2, 21 is a binary input terminal, and 22 is a 2
Value code B input terminal, 23 is exclusive OR (exclusive OR) gate, 24 and 31 are AND dart, 25
is a pulse oscillator, 26 is a binary signal transmission line, and 27 is a low signal transmission line.
28 is a waveform shaping circuit, 29 is a differentiation circuit,
30 and 32 are monostable multivibrators, 33 is a binary signal output terminal, and 34 is a binary signal B output terminal. 2
The value signal B input terminal 22 and the iR pulse generator 25 are connected to an AND gate 24, and the output of the AND gate 24 is connected to one input of the exclusive OR gate 23. On the other hand, the binary signal A input terminal 22 is connected to the other input of the exclusive OR gate 23. The output of the exclusive OR gate 23 is the binary signal transmission line 26
is connected to the receiving side via. Transmission line 2 on the receiving side
6 is connected to a low-pass filter 27 and a differentiation circuit 29, and the output of the low-pass filter 27 is connected to a binarization signal A output terminal 33 via a waveform shaping circuit 28. On the other hand, the output of the differentiating circuit 29 is connected to a monostable multivibrator 30 and to one input of a 0 gate 31. Another input of the Φ gate 31 is connected to the output of the monostable multivibrator 30. And AN
The output of the D.G.) 31 is connected to the binarization signal B output terminal 34 via the monostable tZ ibrator 32.

To explain the operation of this embodiment having the above configuration, the shape of the binarization signal B input terminal 22 is 1μ (Fig. 3(a)
)) is rlJ, the repetitive signal with a small duty from the pulse oscillator 25 (FIG. 3(C)) is the output of the AND gate 24), and this output signal and the binary code A (FIG. 3(a) )) and an exclusive OR signal (FIG. 3(d)) is transmitted via the binary code transmission path 26. On the other hand, when the state of the binary code B input terminal 22 is "0", the output of the AND gate 24 is 0), and the binary code A is transmitted as it is via the binary code transmission line 26.

The signal multiplexed in this manner and transmitted to the transmitting side via the transmission path 26 is passed through a low-pass filter 27 to remove the . The waveform is shaped, and the binary signal A is reproduced at the binary signal A output terminal 33. Also, the multiplexed signal is
A signal change is extracted by a differentiating circuit, and the monostable multivibrator 30 is triggered by this signal. Here, it is assumed that the output time width of the monostable multivibrators 30 and 32 is set to 1.5 times the repetition period of the pulse oscillator 25. Therefore, only when the output of the differentiating circuit 29 continues within this time, the monostable multivibrator 32
In this case, the binarized signal B is reproduced at the binarized signal B output terminal 34.

As explained above, in this embodiment, the two signals are reproduced by using a low-pass filter or by detecting the continuity of pulses, so there is no need to transmit a synchronization signal. It has the advantage of not being out of place.

(Effects of the Invention) According to the present invention, there is an advantage that there is no need to transmit a synchronization signal, there is no time required to establish synchronization, there is no loss of synchronization, and it is suitable for multiplexing binary transmission lines using optical fibers. can be used.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a conventional multiplexing method, Fig. 2 is a diagram showing an embodiment of the multiplexing method of the present invention, and Figs.
(f) is a time chart of the above embodiment. 1.21...Binarization signal A input terminal, 2,22...2
Value code B input terminal, 3...Synchronization signal generation circuit, 4...
・Selector, 5, 26...Binarization signal transmission line, 6, 7・
...D type Frizzo Frozzo, 8...Synchronization signal detection circuit, 9, 33...Binarization signal A output terminal, IQ, 34
...Binarization signal B output terminal, 23...Exclude OR dirt, 24.31...AND game, 25
...Nozzles oscillator, 27...Low pass filter,
28... Waveform shaping circuit, 29... Differential circuit, 30.
32... Monostable multivibrator.

Claims (1)

[Claims] In a method for multiplexing a first binary signal and a second binary signal on a binary coded transmission path, the first and second binary signals have a short period and a small duty. A logical product of the signal and the second binary signal is performed, and an exclusive OR signal of the signal obtained by the logical product and the first binary signal is transmitted. Valued sign multiplexing method.