JPS6043934A - Multiplex communication device performing time division by identification pulse - Google Patents

Abstract

PURPOSE:To eliminate an idle time while the absence of a signal by using a transmitter outputting a digital signal at the beginning of which an identification pulse is added for a prescribed time only when a digital signal is inputted and a receiver switching a signal path for a prescribed time after identification. CONSTITUTION:An output of a digital signal source 1 is inputted to a digital signal transmission circuit 2 comprising an encoder 21 and a serial converting circuit 22 and also to a digital switching circuit comprising an input detection circuit 31 and a one-shot multivibrator circuit 32. An output of an analog signal source 4 is inputted to a digitized analog signal transmission circuit 5 comprising a bias circuit 51, a sampling circuit 52 and a pulse width modulation circuit 53. An input section of an analog signal output device 6 is connected to an output section of a pulse width modulation signal demodulating circuit 7, and the input section is connected to a switch 81. A load group 9 is connected to a digital signal reception circuit comprising a decoder 101 and a parallel converting circuit 102. A signal transmitter 11 consists of converters 111, 113 and a propagation cable 112.

Description

Detailed Description of the Invention Technical Field of the Invention The present invention relates to a multiplex communication device that performs time division using identification pulses and is capable of transmitting various analog signals and digital signals of a vehicle through the same propagation path by multiplex communication. It is.

Conventional technologyWhen transmitting an analog signal and a digital signal on the same propagation path, start-stop synchronization involves sampling and linking the analog signal, converting each sample into a binary code, connecting the digital signal, converting it into a serial digital signal, and transmitting the signal. It was transmitted using a type multiplex communication device.

Figure 1 shows an example of transmission by a conventional asynchronous multiplex communication device.
h, the next t hits are assigned to digital signals such as control signals, and the next 70 hits are converted into 2 brigadier signals from analog signals 1; 3. In addition, the last / bit was set to 1-8P, and the last / bit was set to 7 spans, and this was repeatedly and continuously transmitted as an asynchronous signal.

However, in each span of the asynchronous signal of this conventional device, there is always a time interval for the tintal signal of G bits, and when the tintal signal 'l'3 is not input, the time of G bits ends up being idle. This is a time that hardly contributes to multiplex communication. In the conventional example shown in Fig. 1, this play time is
In order to effectively transmit the analog signal, it is necessary to increase the number of bits as much as possible to increase the resolution in the amplitude direction of the analog signal. It was necessary to shorten the sampling time interval to increase the resolution with respect to the frequency of the analog signal.

This sampling time interval conflicts with the span time interval, and as the number of span hits increases, the frequency of the clock pulse to advance each pulse within the span must be increased, resulting in high-speed transmission performance. or requested.

Purpose of the Invention The present invention has been made in view of the above, and it transmits only a digitized analog signal when no digital signal is input, and can be distinguished from the analog signal only when a digital signal is input. By first adding an identification pulse with a pulse width and outputting a serial digital signal obtained by serially converting the digital signal for a certain period of time, idle time when no digital signal is input is eliminated, and furthermore, an analog signal can be It is an object of the present invention to provide a multiplex communication device that can transmit analog signals relatively faithfully and efficiently by pulse width modulation and transmits them, and that performs time division using identification pulses without requiring high-speed transmission performance.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the accompanying drawings.

In FIG. 2, 1 is a digital signal source, and the output section 1a of the digital signal source 1 is connected to the input section 21a of the encoder 21 and the input section 31a of the Tinkle input detection circuit 31 by a plurality of signals -'i <y. are connected to each.

The output section 21b of the encoder 21 is connected to the input section 22a of the serial conversion circuit 22 through a plurality of signal lines, and the encoder 21 and the serial conversion circuit 22 constitute the digital signal transmission circuit 2.

Furthermore, the output section 31b of the Tinkle input detection circuit 31
is the first one-multi circuit (hereinafter simply jrrO8
"M circuit". ) 32 is glued to the input section 32a,
The output section 32b of the 10th) O8M circuit 32 is connected to the first input section 33a of the first switch 33, and the Tinkle input detection circuit 31° is connected to the first O8M circuit 32 and the first
The switch 33 constitutes a first stage switching circuit 3.

Further, 4 is an analog signal source, and the output section 4a of the analog signal source 4 is connected to the input section 51a of the bias circuit 51, and the output section 51b of the bias circuit 51 is connected to the input section 52a of the sunblink circuit 52. , the output section 52b of the sunblink circuit 52 is a pulse width modulation circuit (hereinafter simply "P").
WM circuit) 53, and is connected to the input section 53a of the WM circuit 51. Sunblink circuit 52 and PWM
The circuit 53 constitutes the analog signal generating circuit 5.

Further, the output section 22b of the serial conversion circuit 22 is connected to the first output section 22b.
The output section 53b of the PWM circuit 53 is connected to the second input section 33b of the switch 33, and the output section 53b of the PWM circuit 53 is connected to the second input section 33b of the switch 33.
3, respectively.

6 is an alley lock signal output device, and an input section 6a of the analog signal output device 6 is connected to a pulse width modulation signal demodulation circuit (hereinafter simply referred to as "demodulation circuit") 7a. The input section 7b of the demodulation circuit 7 is connected to the first output section 81a of the second switch 81, respectively.

9 is a load group, the input section 9a of the load group 9 is connected to the output section 101a of the decoder 101 through a plurality of signal lines, and the input section 101b of the decoder 101 is connected to the output of the parallel conversion circuit 102 through a plurality of signal lines. The human power section 102b of the parallel conversion circuit 102 is connected to the second output section 81b of the second switch 81, and the decoder 101 and the parallel conversion circuit 1
02 constitutes a Tinkle signal receiving circuit 10.

Historically, the first input section 81c of the second switch 81
is connected to the output part 82a of the second O8M circuit 82, the input part 82b of the second O8M circuit 82 is connected to the output part 83a of the identification circuit 83, and the input part 83 of the identification circuit 83
b are respectively connected to the second input section 81d of the second switch 81, and the second switch 81. second O
The 8M circuit 82 and the identification circuit 83 constitute the second digital switching circuit 8.

11 is a signal propagator, and the signal propagator 11 is a first converter 111 . Propagation cable 112 and second converter 11
3, the input section 111a of the first converter 111 is connected to the output section 33d of the first switch 33.
The output part 113a of the second converter 113 is connected to the second input part 81d of the second switch 81 and the input part 83b of the identification circuit 83, and the output part 113a of the second converter 113 is connected to The section 111b and the input section 113b of the second converter 113 are connected by a propagation cable 112.

The digital signal transmitting circuit 2. The first signal switching circuit 3 and the digitized analog signal transmitting circuit 5 constitute a transmitting circuit SE, and the demodulating circuit 7
．． The second signal switching circuit 8 and the tintal signal receiving circuit 10 constitute a receiving circuit RE.

The electric circuit diagram shown in FIG. 3 has identification pulses S1. FIG. 6 is a diagram of a first embodiment of an identification circuit 83 for identifying a serial tintal signal with S2 . -, the output part 831b of the input circuit 831 is connected to the input part 832a of the delay timer 832, and the output part 831b of the delay timer 832 is
32b is connected to the input section 833a of the trigger circuit 833, and the output section 8331) of the trigger circuit 833 is connected to the first input section 834a of the
The second input 834 )) of the circuit 834 is the identification circuit 83
The output section 834c of the ant circuit 834 is connected to the output section 83a of the identification circuit 83, respectively.

Further, the electric circuit diagram shown in FIG. 4 can be distinguished from the digitized analog signal shown in FIG. 7 by the identification pulse S'1. S',? . . . is a diagram of a second embodiment of a discriminating circuit 83' for discriminating a series Tinkle signal having an input section 83b' of the discriminating circuit 83'
is connected to the input section 835a of the triangular wave generation circuit 835,
The output section 835b of the triangular d generation circuit 835 is connected to the comparator 83.
A reference voltage V is connected to a reference input section 836b of the comparator 836, and an output section 836c is connected to an output section 83a' of the identification circuit 83/.

Operation Next, the operation of the multiplex communication apparatus having the above configuration and performing time division using identification pulses according to the present invention will be explained in detail.

A multiplex communication device that performs time division using identification pulses according to the present invention has one identification pulse S1. The second embodiment is shown in FIGS. 7 and 8 by making the pulse width of S2... smaller than the pulse width modulated minimum signal width Lbi seconds. Identification pulse S'l +
S'2... can be broadly classified into those that enable identification by making the pulse width larger than the summing interval L p C seconds of pulse width modulation.

Function of the first embodiment First, the function of the first embodiment of the present invention will be explained in detail with reference to FIGS. 2, 3, 5, and 6.

In FIG. 2, reference numeral 1 denotes a Tinkle signal source, which is, for example, various switches of an audio device.

The output of the MA de nocle signal source 1 is manually input to the encoder 21! Since this minus sign is a parallel tinkle signal, it is converted into a serial tinkle signal by a serial conversion circuit 22 to enable multiplex communication, and the serial conversion circuit 22 further converts identification pulses S+, S2, and music into It is added to the beginning of the serial Tinkle signal and input to the second input section 33b of the first switch 33.

Reference numeral 4 denotes a signal source for the antenna 11, which is, for example, an audio signal source converted into an electric signal, such as a radio of an audio device or a cheap cork. The output of the analog signal source 4 is input to the bias circuit 51, and this human-powered analog signal is converted by the bias circuit 51 to a bias level vb(
Hol I.] is added and input to the sampler circuit 52.

The sampler circuit 52 extracts the input analog signal at every sampling interval IJt [seconds] and inputs it to the PWM circuit 53.

Here, each extracted analog signal extracted by the sampler circuit 52 is a vertically elongated pulse having information in the voltage V (volt) direction, and according to the characteristic diagram shown in FIG.
Ol jl: t,, C seconds]... every e3. .

43. An extracted analog signal having information on the voltage V [Porto] direction of e2 [Porto]... is extracted. Then, this extracted analog signal is input to the PWMN path 53 and is converted from a vertical change in the voltage V (volt) direction to a change in pulse width. According to the characteristic diagram shown in FIG. 5, the extracted analog signal is t., tl.

t2C seconds: ]-= every day, e. ', l+', 4' (seconds:
--CD It is converted into a ticked analog signal having information on changes in the pulse width in the time t (second) direction and is input to the third input section 33c of the first switch 33.

On the other hand, the output of the Tinkle signal source 1 is also input to the Tinkle human power detection circuit 31. The input detection circuit 31 connects the differentiating circuit 4 to each of the signal lines from the T, T, Tal Chisho Yumi source 1, and connects the output of the d differentiating circuit to an OR circuit. For example, one of the external push switches constituting the digital signal 4+ii 1 or 1 . . . Then, the differential circuit associated with the operated switch) is output via the OR circuit. And this Torika Shinkyu is the first
When inputted to the 03MM path 32 of the first O3M circuit 3
2↑The first input section 33 of the first glue changer 33
A pulse of 71 times is input here. Here, the constant time is the output from the serial conversion circuit 22. It consists of an identification pulse and a serial tinochle signal. Series θ] It is possible to substantially include a pulse train. Then, while the first O8M circuit 32 is inputting 0) to the first input section 33a of the first switch 33 for a certain period of time, the first switch 33 is The second human power section 33b and the output section 33d are connected, and the output signal of the serial conversion circuit 22 is outputted through the first switch 33. Further, when there is no input to the first input section 33a of the first switch 33, the third input section 33c of the first switch 33 and the output section 3
3d is connected, and the output signal of the PWM circuit 53 is outputted via the first switching device 33.

Further, 11 is a signal propagator, and the signal propagator 11 receives the transmitted signal of the transmitting circuit SE and propagates it through (N circuit R1-)7, for example, a signal propagator using an optical communication means or the like. , those using wired communication means, etc.

For example, when using optical communication means, 1) IJ 1
The output signal from the output section 33d of the switch 33 is converted from an electric signal into an optical signal by the first converter 111, and for example, the signal is transmitted from an optical signal consisting of 7 beams /; 1 --- full 1
12, the optical signal is propagated to a second transducer 113, and the second transducer 113? From this, it is restored into an optical signal or an electrical signal. If a wired communication 'fiM means is used', the first converter 111 and the second converter 113 are omitted, and the electrical signal is propagated by a propagation cable 112 made of a conductor.

8 is a second Tinkle switching circuit;
The tinkle switching circuit 8 of 4, ' ``i b<
The signal propagated by the carrier 11 is serially connected to the terminal 1.
] This is a circuit for adding 1 C to the bow and the tinkle-formed analog signal, and identifies the identification signal added first to the serial tinkle 11° bow θ) and converts it to the second glue changer 8.
1 to switch the signal path).

To describe the second tinkle switching circuit 8 in detail, reference numeral 83 is an identification circuit, and the identification circuit 83 is subdivided into one small block and one hook per cycle, with reference to FIGS. 3 and 6. The operation of the identification circuit 83 will be explained. The identification circuit 83 detects the short pulse-less middle-hanging signal added at the beginning of the off-target Tinkle signal: it! There is a circuit for identifying male 'l /<''res St, S2...-,
When a time-division multiplexed signal of the serial cycle signal and the serial cycle signal is input to the input section 831) of the identification circuit 83, the waveform of this time-division multiplexed signal is as follows. Delay timer 832 is inverted by in-hark 831
is input. The delay timer 832 receives the rising pulse from the impark 831 and calculates the delay time ts.
After (seconds), a pulse is input to the tri-force circuit 833,
The trigger circuit 833 sends a short check pulse to the ant circuit 83 based on the input signal from the delay timer 832.
4 to the first input section 834a.

At this time, the second input section 834b of the ant circuit 834 also
If there is an input coverage of 1", the nuclear circuit I circuit 83
The output section 83 of the identification circuit 83 via the output section 834c of 4
A pulse synchronized with the check pulse is output from a.

Here, the 0'' level time of the tinkle analog signal is equal to the bias level Vb of the bias circuit 51.
Minimum signal width Lb i determined by i (volts)
seconds] shorter (J, old identification pulse St
, S2...'s signal width Ls 1 second] is the maximum signal width Lbi (seconds) of the tinckled analog signal.
Set smaller than 1, and further set the check pulse to “1”.
The identification pulse S1. S2...(1)"I
"The delay timer 7832 is synchronized with the
2], the output J part 83a of the identification circuit 83 outputs the identification pulse S6. S2 ``''''It will output a pulse only when it is manually operated.

Then, the front V′l [S1 identification circuit 83 detects the identification pulse St
, S2, the output section 83 of the identification circuit 83
The pulse of the current time is input to the input section 82b of the 20th) O8M circuit 82 from a, and the 20th) O8M circuit 82''l
'jl j'J: From the point in time when the 47-hour pulse is input, a certain period of time/cabarth is input to the [human power unit 81c] of the second switching circuit 81. At this time, the second O8
The constant time balloon 4 outputted from the M circuit 82 is the same as the balloon 7 outputted from the 10th) O8IV1 circuit 32.
This is a pulse having a time width of approximately fil-.

History 1. Is the second 11-switching circuit 81 powered by the first human power? 1j81c while a pulse for a certain period of time is input from the second O8M circuit 82, the second human power F4B
81 d and the second output section are connected to input the error signal to the parallel conversion circuit 102 . At this time, the signals input to the parallel conversion circuit 1021 are the identification pulse S,
, S2 . . . are first added by 1ζ].

The parallel tinkle signal output from the parallel conversion circuit 102 is input to the lever 1011 and converted into a signal for operating the load group 9.

For the first input section 81c of the second switch 81, when there is no manual input from the second Z) O8M circuit 82, the second switch 81 switches between the second input section 81d and the first input section 81c. The multiplexed signal is input to the demodulation circuit 7 by connecting the output section 81a of the multiplexed signal to the demodulation circuit 7. The demodulation circuit 7 (11 is a 1-1-pass filter, for example, passes one pulse and the modulated low-pass filter to the low-pass filter and outputs the original 1-J signal. This is based on Shannon's link theorem.The output of the demodulation circuit 7 is, for example, the output of the speaker of an audio device (H output unit 67). is input.

\\The device of the first embodiment of the invention mixes the dovetail signal and the digital signal in a time-division manner by the above-described operation, and generates i(
j! Believe and separate.

Function of Second Embodiment Next, the function of the second embodiment of the present invention will be explained in detail with reference to FIGS. 2, 4, 7, and 8. .

The difference between the second embodiment and the first embodiment of the present invention is ';'6
B1. ! In circuit SF'', /Ritzl conversion circuit 2
2Q] effect, and in the receiving circuit RE, the identification circuit 8
3, and the functions of the other blocks are the same.

The difference in the serial conversion circuit 22 is that in the first embodiment, the jt output by the serial conversion circuit 22 is
At the beginning of the E column specific signal, the pulse width of the identification pulse S+, S2... is indented to be smaller than the minimum width Lbi 1 second of pulse width modulation.
In the second embodiment, the pulse width of the identification pulse SI'+82' is made larger than the pulse width modulation thump link interval LpC seconds]. .

Next, the difference in the identification circuit 83 is that in the first embodiment, a check pulse is output to the wheat for a certain period of time from each falling edge of the multiplexed signal, The identification pulse is identified from this, and in the second embodiment, the triangular wave generation circuit 835? Is the pulse width the electric potential? ζ conversion and comparator 8
It is said that the identification pulse is identified by 36.

The identification circuit 83' of the second embodiment will be described in further detail with reference to FIGS. 4 and 8.

The identification circuit 83' determines that 4== at the beginning of the serial digital signal.
J-added long pulse width identification bus/lz Sl'IS
This is a circuit for identifying 2'..., and the identification circuit 83'
When a time-division multiplexed signal of a digitized analog signal and a serial digital signal is input to the input section 83b', the triangular wave generation circuit 835 generates each of the peak values according to the width of each pulse of the time-division multiplexed signal. Different triangular waves are output. The longer the pulse width, the higher the potential of the peak value of this triangular wave.

Then, the identification pulse Sr + S2' with a wide pulse width is
The potential of the peak value of the triangular wave that was inputted is the comparison circuit 836θ] reference potential VTR of the reference human power section 836b.
['B becomes higher than 11.1, and a pulse is output from another circuit 83' to the output section 836 of the comparator circuit 836 (-4- to iilo, 11i2θ) signal is input, the pulse width becomes 1. 1. The potential of the peak value of the -1 angle wave will never be higher than the reference potential VTH1 + 11.1, and it is unlikely that the identification circuit 83' will output □roots.

Note that the identification circuit 83 for identifying and identifying identification pulses according to the first embodiment of the present invention is not limited to the electrical circuit diagram shown in Figure 2g3,
A means for generating a check pulse synchronized with the rising or falling edge of each pulse (0) or a means for generating an output by comparing the pulse with the current value is suitable. Similarly, the identification circuit 83' of the second embodiment of the present invention is shown in FIG. Is there a way to generate a buff with a pulse width of 1 - 1 for a certain period of HHI, or human power, without being limited to this electric circuit diagram? ).

K, first U-slip switch 33 and second switch 81
As a means of returning the signal path from the Tinkle signal path to the analog signal path, it is also possible to add another identification pulse to the end of the Tinkle signal bit and to switch by identifying this other identification pulse. Also, propagation-
~It is also possible to use the crane 112 as an intangible medium such as air to propagate signals using light, sound waves, or radio waves.

Effects of the Invention The present invention is a multiplex communication device that performs time division based on one identification pulse without having the same structure and operation.

(a) Transmit an analog signal that has been converted into a 1:1 signal so that the digital signal cannot be transmitted to humans, and when an analog signal is input θ). By using a transmitting device that outputs a T/T signal for a certain period of time and a receiving device that can switch individual signal paths for a certain period of time when identifying an identification pulse, it is possible to eliminate idle time when the T/T signal is not manually operated. .

(I) Discrimination between the digitalized analog iris and the discrimination pulse is facilitated by using a discrimination circuit that discriminates based on the time width of the pulse.

(c) Since it uses a pulse width modulation circuit that pulse width modulates the analog signal, low-speed transmission is possible, and the analog signal can be transmitted relatively faithfully and efficiently.

[Brief explanation of the drawing]

FIG. 1 is an electrical characteristic diagram showing an example of transmission by a conventional asynchronous multiplex communication device. FIG. 2 is a block diagram showing an embodiment of the present invention. FIG. 3 is a small block diagram showing the identification circuit of the first embodiment of the present invention. FIG. 4 is a small block diagram showing an identification circuit according to a second embodiment of the present invention. FIG. 5 is an electrical characteristic diagram showing waveforms of various parts in the first embodiment of the present invention. FIG. 6 is an electrical characteristic diagram showing waveforms of various parts of the identification circuit according to the first embodiment of the present invention. FIG. 7 is an electrical characteristic diagram showing waveforms of various parts of the second embodiment of the present invention. FIG. 8 is an electrical characteristic diagram showing waveforms of various parts of the identification circuit according to the second embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Digital signal source, 2... Dinkle signal transmission circuit, 3... First digital switching circuit, 4... Analog signal source, 5... Digitalized analog Signal transmission circuit, 6... Analog signal output device, 7... Pulse width modulation signal demodulation circuit. 8...Second digital switching circuit, 9...
Load group, 10... Signal propagator, 31... Tinkle input detection circuit, 53... Pulse width modulation circuit , 83...Identification circuit. ”−

Claims (1)

[Claims] fl) - In a multiplex communication device that performs multiplex communication of digital signals and analog signals, an analog signal is output when the digital signal is not input. a transmitting circuit that switches the circuit to add an identification pulse with a pulse width that can be distinguished from the analog signal to the digital signal and output it for a certain period of time when the digital signal is detected; and a signal propagation circuit that transmits the output signal of the transmitting circuit to a receiving circuit. When a digital signal is not input from the signal propagator, it is an analog signal; a circuit is formed to output an analog signal, and when a digital signal with an identification pulse added is input, an identification pulse is output. What is claimed is: 1. A multiplex communication device that performs time division using identification pulses, characterized by a receiving circuit that detects a digital signal and switches the circuit to output the digital signal to a control signal output section for a certain period of time. (2) A multiplex communication device that performs time division using identification pulses as set forth in claim 1, wherein the transmitting circuit includes a pulse width modulation circuit that modulates the analog signal in pulse width.