JPS6066550A - Method and apparatus for transmitting information - Google Patents

Abstract

PURPOSE:To enable to increase the kind and quantity of information that can be transmitted by one transmitting system by making nil the output of the positive pole of two pulses out of waveform pulses constituting a carrier and at the same time, changing the number of pulses inserted between the two pulses. CONSTITUTION:In a modulating equipment, two pulses, front and rear, out of the pulses that constitute the carrier are selected so that the number of pulses inserted between the two pulses correspond to the information to be transmitted through a rise detecting circuit 21, a fall detecting circuit 22 and a switching element 24, and the modulation that makes the output of the positive pole of the two pulses nil is performed. In the modulating equipment, a number check circuit 43 makes an output only when two specified no output pulses are detected in the first half of each period of a modulated wave, and give a fetch enable signal (t) to a register 44 and the content of a counter 42 is fetched in the register 44. The content of the register 44 is transferred to a memory 46, and the content of the memory is restored to transmitted information 1 by a decoder 47.

Description

[Detailed Description of the Invention] The present invention relates to an information transmission method and an apparatus for implementing the method, and more specifically, on the transmitting side, a carrier wave is amplitude-modulated with a code signal (a rectangular modulated wave). By using an existing transmission system in which the modulated carrier wave is transmitted and the receiving side receives and demodulates the modulated carrier wave to detect the code signal, the code signal is transmitted independently of the information transmitted by the existing method.
7. - It relates to an information transmission method and device.

In the transmission system of ATC (Automatic Train Control) or ATS (Automatic Train Stop) equipment, it is desired to be able to increase the number of types of information transmitted from the ground to the train. There is. For example, for ATC, it is desirable to increase the types of speed limit information, and
It is desired to be able to transmit various types of information independent of 'C (or ATS, hereinafter the same) information.

In ATC d3, as a method of transmitting other types of information, a carrier wave is modulated with another type of modulation wave, transmitted from the ground, and then received and demodulated onboard the vehicle.
A method is used in which the same number of types of AT'C information as types of modulated waves are transmitted, but in this transmission method, the frequency band of the modulated waves used there is, for example, 10 to 100H.
Since it is limited to a relatively narrow range like z,
There are certain limitations on the types of AT'C information that can be transmitted due to constraints due to the performance of filters and amplifiers, the need to avoid noise, and to ensure safety.

There is a case where information independent of ATC information is transmitted from the ground to a vehicle or from the ground to the ground in order to improve the reliability of ATC information. For example, in connection with level crossing control, the type of approaching train is selected, and if the train in question is a train that stops at a station in front of the level crossing, the level crossing is opened, but the train is informed of the train's stop from the ground. It is conceivable to transmit ATC information to cause the train to stop and skip, set the departure signal to the forward orientation state, and send ATC information to the track circuit that includes the level crossing to cause other trains to continue and skip. In this case, the Δ-IC information needs to be constantly transmitted for other trains passing through the track circuit.
The above train stop information is not independent from ATC information.

Other information independent from the ATC information includes door opening/closing command information, departure time control information, and in-vehicle guidance broadcast start command information.

In view of the above points, the present invention utilizes an existing transmission system to transmit information independent of the information originally transmitted by the transmission system, thereby making it possible to transmit information that is independent of the information originally transmitted by the transmission system. The purpose is to enable an increase in the types and types of information that can be transmitted.

In order to achieve the above object, in the present invention, a carrier wave is amplitude-modulated with a code signal on the transmitting side and transmitted, and the receiving side receives and demodulates the modulated carrier wave to detect the code No. 13. In the information transmission device, the transmitting side specifies a plurality of pulses among the waveform pulses constituting the carrier wave so as to correspond to the number of pulses inserted between them or the information to be transmitted; and modulates the positive or negative output of the pulse,
On the receiving side, among the pulses that make up the received carrier wave,
Detects positive or negative output or nothing,
Information is extracted based on the number of pulses or time inserted between them.

Next, this invention uses two pulses for information transmission, uses the track circuit as part of the transmission system, and transmits A from the ground to the vehicle.
Utilizes the ground vehicle mass information transmission device that transmits the C information.
U, 1i independent from ATC information! An embodiment in which i' information is transmitted will be explained based on the drawings.

FIG. 1 shows the l'il of an information transmission device implementing this invention.
This diagram schematically shows the t formation, and the l portions A and B surrounded by the dashed line are newly added (=J) (14
The remaining part is the existing structure for transmitting ATC information from the ground to the vehicle.

In the part other than A and B, the carrier wave a from the carrier wave oscillator 1 is modulated by a square wave modulation wave from the modulating wave oscillator 2 in the modulator 3, the signal is amplified by the amplifier 4, and then the first transformer The signal wave is amplified by a power amplifier 6, a power amplifier 6, and a second transformer 7, and is transmitted to a track circuit 9 through an impedance bond 8. The signal wave is received and demodulated by the ATC receiver 5 circuit 12,
By detecting the modulated wave, AT
C information is transmitted onto the vehicle.

The waveform of the signal wave sent to the orbital circuit of this platform is the second waveform.
As shown in Figure C.

Now, according to the present invention, Δ is a modulation device C added to transmit information independent from ATC information using the above ATC information transmission system, and modulated waves such as carrier wave a and When independent information I is input manually, there is a pair of pulses before and after d5 in the first half of the period of the modulated wave, and the time width between the pulses corresponds to the content of information 1 using the pulses that constitute the carrier wave. encoder 1 that outputs pulses set by
3 and a switching cable 24 which is operated by its output pulse (to set the pace voltage of the transistor on one side of the power amplifier 6 to ○■).

The main functions of this modulator A are as follows.

(A) As shown in Fig. 3, at the time when card time t1 is taken from the rise of the modulated wave C, the positive or negative output of the carrier wave pulse included in the signal wave C is nullified. output the first pulse for

(B) Count the number of carrier wave pulses from the time of outputting the first pulse, and when the counted value matches the data converted from input information I, output the positive or negative polarity of the carrier wave pulse included in signal wave C. outputs a second pulse to nullify again.

(1) The switching cable 24 is operated by the pulses of mi[1 and 2] to set the base voltage of the transistor of the -C1 power amplifier 6 to OV.

Note that guard times tl and t2 are provided before the first pulse that makes the output zero and after the second pulse (in consideration of the transient characteristics accompanying the rise and fall of the modulated wave).

In this way, the modulation device l\ selects two pulses before and after the pulses constituting the carrier wave a@ according to a predetermined principle, makes the stop or negative output of the pulse zero, and inserts the output between the two pulses. The number of pulses of the carrier wave to be transmitted is changed according to the contents of the independent information 1.

In addition, B is a position in which the signal wave C' received from a transmission system using a track circuit receives information independent of ATC information (= J added Jl 'A position, and the above band After detecting the pulses constituting the carrier wave a received through the filter 11, the pulses with no positive or negative output are detected, and the number of pulses inserted between the no-output pulses is measured. Then, output the measured value data using the machine 1.

Next, an example of a specific configuration of the modulation device A will be described in detail with reference to FIGS. 3 and 4.

The modulated wave of the transmitter is directed to the dry 11 generating circuit 14 and the falling detection circuit 15 by any chance. Card time creation circuit 14 is a one-shot multi-vibrator 14.8
, an inverter 14b whose output d is inputted manually, and a two-powered inverter 14b whose input is the output of the inverter and the modulated wave. After that, jg [constant length 1. avoidance time〈
This guard time creation circuit 14 after the card time) has elapsed.
The output e is inputted to the rise detection circuit 16 and also inputted to the counter 17 as a run 1 enable signal.

The rising edge detection circuit 16 detects the rising edge of the output e of the guard time creation circuit after the dog time 11 has elapsed, outputs it as an output, and supplies the output f to the knob knob 18 as a set edge.

-BJ, the counter 17 receives the general transmission wave a from the transmitter.
The pulse formed in l is 1 koku pulse, and 1j is given -C. Further, the falling edge detection circuit 15 outputs an output every time it detects a rising edge of the modulated wave 1, and outputs the output edge to the counter 17 as a clear signal. Therefore, the counter 17 is used in the first half of each cycle of the modulated wave l) to calculate the constituent pulses of the carrier wave, but at the beginning of the rise of the modulated wave, the counter movement 1'1 is unbalanced. Since there is a constant C, the unsteady time is removed by the time t1 of the cart time creation circuit 14.

The contents c1 to n of the counter 17 are always supplied to the comparator 19, and the comparator receives numerical data D1, which is input from the outside via the internoce circuit 2o. ...Compared with Dn. This data (
- The above-mentioned existing information 9) Information transmitted by the 7 transmission device
In one of the comparators, the contents of the counter 17 are compared c', for example, converted into a binary coded decimal number.

Then, in one period of the modulated wave, d3-C1, as mentioned above, after 1l of card time has elapsed, the Noritub flop 1
8 is played from 1 to output b! Counter 1
7 opens the number of carrier wave pulses based on enable time separation e! iji L/, its 1, 1 numerical value is sequentially, comparator 1
9 and compared with j−-91]. When the so-called numerical value matches the data, the comparator 19i outputs the output g.
is applied to the flip flop 18 as a reset manual force.

Noripf (output of the tip 18) lh is input manually to a rising detection circuit 21 and a falling detection circuit 22, respectively.

Further, the detection outputs of the rise detection circuit and the fall detection circuit are manually inputted as operation signals to a grounded switching element 24 via an OR gate 23. The switching element 24 is connected to the pace side of one of the transistors 1-rl of the power amplifying section (class 8 bush-pull amplifier) 6 constituting the transmitting section of the existing transmission device.

Therefore, the switching element 24 is
When the operating signal is input to
becomes inactive, and the positive or 9-pole output of one pulse of the carrier wave included in the 18th wave C from the amplifier 5 becomes null.

The polarity of the output of the carrier wave pulse may be either positive or negative li3+ polarity of the two pulses, and bb< may be of different polarity. Two carrier wave pulses are generated before and after J5C within the half cycle 1111 of the modulated wave, and the horn is "none".
In TC information transmission, envelope detection is not affected.

In addition, in order to eliminate the outputs of different polarities for the two pulses, switching elements each operated by the output 1 of the rising detection circuit 21 and the output J of the falling detection circuit 22 shown in FIG. The base side H voltage of each transistor 1-r 1 and -1-r 2 of the power amplifier 6 may be set to Ov by the switching element.

In this way, the modulation device 13 receives J3C (Y, 1), and the modulated wave transmitted from the modulated wave transmitting section 2 to the modulation device receives d3C for each half-cycle of the modulated wave. The flip-flop 18 is reset by the match between the 81 value of the carrier wave 416 generated pulse of the counter 17 and the input information I, so that the rising edge detection circuit 21 detects the falling edge. Through the detection circuit 22 and the Switznung element 24, two pulses before and after the 14th pulse of the carrier wave are detected.
The number of pulses interposed between them is selected in accordance with the information to be transmitted, and modulation is performed in which the output of the positive or negative polarity of the two pulses is nullified. (The waveform of the signal wave C' in FIG. 2 (this case is shown))
' is subjected to noise removal and amplification by a bandpass filter 26 and an amplifier 27 which pass only the carrier wave in the demodulation table 25, and then inputted to the detector 2B. The detection horns are the level detectors 29a and 29j? A guard time creation circuit 29 consisting of an erase timer 29b is used. The guard time created by this (2-6 card time on the transmitting side described above is for the same purpose as 1.), and the human power level at the beginning of reception may be unstable, and the rise of the detector 28. Transient phenomena such as delays are taken into account to avoid uncertainty in pulse counting after (e) at that time. Guard time creation circuit 29 (Yori-drime +2
After the elapsed time, the first half of the period of the modulated wave ends.

Then, the detection output 111 passes through a resistor attenuator 30, is output to a comparator 31, and is compared with the carrier wave C' that has passed through the filter.The pulse of the input signal that has passed through the filter It is not determined whether the no-output component contained in the The carrier wave C' of is passed through a phase inverter 33, and its output and the detection output m are compared by another inverter 33, and the output p of the two comparators is calculated.

1)' is to be manually operated by two people via the or gate 34.

The output of the guard time generation circuit 29 is applied to the other input terminal of the AND gate 35. That is, this AND gate 35 allows only the real pulse of the carrier wave manually inputted from the OR gate 34 to pass through after the guard time t2 has elapsed and until the end of the half cycle of the modulated wave. The combined output of the OR gate, as shown in FIG. A pulse width verification circuit 36 is provided at a subsequent stage to enable detection of no output based on modulation without being affected by minute periods of no output.

The output q of the pulse width verification circuit passes through the inverter 37
It is input to the human power AND gate 38.

The output of the card time creation circuit is delayed by a delay circuit 39 relative to the output from the pulse width verification circuit -C1
C is applied to the AND gate 38 as another input. And the output of that anime game 1 is 1-Rigger.
The flip-flop 40 is manually powered from 1 to rigger to -C. In this way, the trigger flip-flop 40 determines the output values ``1'' and 0'' whenever the pulse width verification circuit detects a carrier wave (one with no output from one component pulse). Then, the output of this flip-flop 40 is sent to 41 (-6 as a signal) to another two-way AND1.

The AND gate 41 is input with the output pulses p and p' of the comparator, and while the gate signals are being input from the rigger flip-flops 40 to 1, the carrier wave constituent pulses from the comparator are input to the counter 42. It will be done.

Therefore, the counter 42 calculates Mt 1 (III) the number of pulses interposed between the two pulses before and after the detected no-output pulse among the received carrier wave pulses.

On the other hand, the output O of the card time creation circuit is inputted as an enable signal L'C to a number check circuit 43 for detecting the number of non-output pulses. The pulse is manually input as the pulse to be counted. This results in J in the first half of each period of the modulated wave.
Only when a predetermined two brewing pulses are detected, the number check circuit 43 outputs an output and gives an enable signal to the register 44 to register the contents of the force counter 42. 44.

The output of the guard time creation circuit ft'j is also given to the falling edge detection circuit 45, and when the falling edge of the output is detected, that is, the frequency 1υ of the modulated wave C is
At the end of the first half of ``, the counter 42 and register 44 are cleared by the output.

The contents of the register 44 are transferred to the memory 46, and the contents of this memory are restored by the decoder 47 to the transmitted information (2).

The above embodiment describes a platform that transmits information from the ground to the train via the track circuit, but it can also be used for transmitting information from the ground to the ground, and It can also be applied when transmitting using a transmission path.

In addition, in the above explanation, the carrier wave pulse used in existing transmission systems is used to carry information between the two pulses that make up the carrier wave, and the information to be transmitted is However, by changing the time length between the two preceding and following pulses in accordance with the information, C-L)Ii
I am capable. But in reality, time 6! In most cases, a pulse with a constant cycle 1+11 is used, but a method of carrying information by changing the time length is also used, as described in 47i of this specification.
It should be understood that this includes the case where the number of pulses changes between pulses with no positive or negative output as described in the claims.

Above) According to the information transmission method of the first invention, as described in the book, the carrier wave according to the current transmission method is set at the back of the waveform pulse of 114, the output of the two pulse stops or the 1-J pole is made zero,
Moreover, by changing the time width between the two pulses or the number of pulses inserted between the two pulses, the information can be transferred without affecting the current information transmission. It is possible to superimpose 7j information and transmit C independently from the 7j information. Then, each period of the modulated wave can contain different information in a)'. In the past, it is now possible to increase the types and types of information that can be transmitted by one transmission system.

Further, according to the second invention, it is possible to easily carry various information by changing the number of pulses inserted between C1 non-output pulses using the pulses constituting the carrier wave, and the rise and rise of the modulated wave can be easily carried. Highly reliable information transmission can be performed by eliminating the influence of transient characteristics associated with the drop.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a schematic configuration of the present invention, and FIG.
The figure is a time chart for reducing the waveforms of a carrier wave, modulated wave, and signal wave; FIG. 3 is a time chart for explaining the basic concept of modulating and carrying information in a modulation device according to the present invention; The figure is a block diagram showing an example of a modulation device, and FIG.
The figure is a block diagram showing an example of a demodulator, and FIG.
This is a time chart showing the waveform of each output in the part indicated by alphanumeric characters. 1...Carrier wave oscillator 2...Modulated wave oscillator 3...Modulator 6... Power amplifier 9...Trajectory circuit 12...Receiving circuit A...Modulating device 13...Encoder 24...Switching element B...Demodulating device 14.29...Guard time creation circuit special 〕applicant
Japan i. Tsuki Co., Ltd. Shusaku Neyama Masashisho (Method) February 29, 1980 Kazuo Wakasugi, Commissioner of the Patent Office 1. Indication of the case 1980 Patent Application No. 175085 2. Name of the invention Information transmission method and device 3. Relationship between the person making the amendment and the case Patent applicant name (465) Nippon Signal Co., Ltd. 4, Agent address: 105

Claims (2)

[Claims] (1) (a) On the transmitting side, the carrier wave is amplitude-modulated with a code signal (a rectangular modulated wave) and transmitted, and on the receiving side (on the g side, the modulated carrier wave is received and demodulated, and the code signal is In an existing information transmission device that detects (l), the transmitting side transmits a plurality of waveform pulses among the waveform pulses that constitute the carrier wave, depending on the number of pulses or time inserted between them. (c) On the receiving side, the output of the positive or negative polarity of the plurality of pulses is specified to correspond to the information that corresponds to Or, by detecting when the output of the negative electrode is null, measuring the number of pulses or time of the carrier wave inserted between them, and restoring the above information based on the measured value, (d) Existing An information transmission method characterized in that, by using a transmission system, information independent of information transmitted by the existing transmission method can also be transmitted. (2) The transmitting side is equipped with (a) a transmitter that modulates the amplitude of a carrier wave with a modulated wave and transmits it using an amplifier, and (b) a predetermined card from the rising edge of the modulated wave. After the time elapses, the outputs of the guard time creation circuit that outputs the modulated wave and the time creation circuit from Sword-1 to the time creation circuit are manually operated as enable signals, and the pulses of the carrier wave are manually operated to add the pulses,
The hakama also includes a counter that is operated manually using the fall detection signal of the modulated wave as a clear signal, and a comparator that compares the data of the information to be transmitted with the contents of the counter and outputs an output when they match. is operated based on the rising edge detection signal of the output of the guard time generation circuit and the rising edge detection signal of the output of the comparator, and converts the Hess voltage of the transistors 1 to 1 on the A side of the amplifier σ to OV. A modulation device including a switching element is provided, and the receiving side includes: (c) a receiver that receives the amplitude-modulated carrier wave, performs envelope detection, and demodulates the carrier wave; and (2) a detector that detects the carrier wave. , the output of the detector] after a predetermined guard time has elapsed, and a guard time creation circuit that outputs an output based on an input of a predetermined level or higher from the detector; The present invention includes a detection circuit that detects a non-output pulse, and a demodulation device that performs an adding operation between the detection outputs before and after the detection circuit, and a counter that counts pulses or time intervals constituting the carrier wave. Information transmission device based on its characteristics.