CN2368764Y - Frequency shifting signal generator for railway signal system - Google Patents
Frequency shifting signal generator for railway signal system Download PDFInfo
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- CN2368764Y CN2368764Y CN 99226123 CN99226123U CN2368764Y CN 2368764 Y CN2368764 Y CN 2368764Y CN 99226123 CN99226123 CN 99226123 CN 99226123 U CN99226123 U CN 99226123U CN 2368764 Y CN2368764 Y CN 2368764Y
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Abstract
The utility model discloses a frequency shifting signal generator for a railway signal system, which comprises two frequency dividers and a control circuit, wherein, a first frequency divider is composed of a crystal oscillator, a frequency divider capable of presetting the number of frequency division, and a number presetting circuit, and the frequency produced by the crystal oscillator can be divided by the first frequency divider. The control circuit is composed of one or two crystal oscillators and a microcomputer with a timer. The carrier frequency and the modulating frequency of frequency-shift signals produced by the utility model both have extremely high precision, so that the working reliability and safety can be enhanced. The utility model also has the advantages of fewer devices, low cost, no problem for circuit adjustment, and convenient manufacture and maintenance.
Description
The utility model relates to the employed frequency-shift signaling producer of a kind of railway signal system.
In the railway signal, use frequency-shift signaling in the circuit of track road, to transmit.After the induction coil induction, after treatment, on locomotive, reappear the ground colour light signal on the locomotive.Frequency-shift signaling is a kind of FM signal.With the square wave low frequency signal to higher frequency (carrier frequency central frequency f
0) carry out frequency modulation and produce.The Changing Pattern of frequency-shift signaling is with carrier frequency central frequency f
0Be the center, do upper and lower frequency deviation, amplitude is constant.When active potential appears in low-frequency modulation signal, carrier frequency f
0Offset downward △ f (being called frequency deviation).f
0-△ f is called lower side frequency.When high potential appears in low-frequency modulation signal, carrier frequency f
0Upwards be offset △ f, be f
0+ △ f, f
0+ △ f is called upper side frequency.Owing to be square-wave frequency modulation, so high potential goes out f
0-△ f, active potential goes out f
0+ △ f, the result of generation also are the same.As seen frequency-shift signaling is to be subjected to the modulation of low frequency signal and alternately a kind of FM signal of continually varying of making lower side frequency and upper side frequency.Upper side frequency, lower side frequency are identical with the frequency of low-frequency modulation signal at the number of times that per second changed in the time.Information transmitted is lower side frequency f in railroad track
0-△ f and upper side frequency f
0+ △ f.Since be square-wave frequency modulation, carrier frequency central frequency f
0Be actually non-existent.In frequency-shift signaling, low-frequency modulation signal is carrying the information of colour light signal.Upper and lower side frequency is then for delivering the usefulness of low frequency signal.In order to improve obstacle overcome ability, the frequency accuracy of low-frequency modulation signal and upper and lower side frequency signal is very high.The frequency-shift signaling carrier frequency central frequency f of railway use at present
0There are four kinds, 550,650,750 and 850 hertz.In the double track railway, uplink adopts 650 and 850 hertz, and downlink adopts 550 and 750 hertz.In the uplink, be divided into little subregion by some kilometers.Adjacent little subregion adopts different carrier frequency central frequencys.Be that central frequency 650 and 850 is in each little subregion arranged spaced of uplink.This crosstalks and is provided with in order to prevent that two adjacent little divisional signals from obscuring mutually.As a same reason, in order to make the interference that does not produce signal between the track that line is adjacent up and down.Downlink carrier frequency central frequency adopts 550 and 750 hertz.In China's railway system, frequency deviation △ f is 55 hertz.So the upper and lower side frequency of 550HZ is 495HZ and 605HZ, the upper and lower side frequency of 650HZ is 595HZ and 705HZ, and the upper and lower side frequency of 750HZ is 695HZ and 805HZ, and the upper and lower side frequency of 850HZ is 795HZ and 905HZ.Low-frequency modulation signal has 4～18 kinds, is 7～60HZ.
Present frequency-shift signaling producer mainly contains three classes: to be low frequency signal produce with the LC oscillating circuit class, obtains through two divided-frequency repeatedly.CF signal also produces with the LC oscillating circuit.With low frequency signal thereby capacitor C in the carrier frequency LC oscillator is switched on and off frequency modulation with the method for electronics and produce the sinusoidal waveform frequency-shift signaling.Each carrier frequency central frequency will use a LC oscillator.The product of this class have the ZPHF shift frequency send box (referring to " wayside signaling automatic guidance ", China Railway Press's in December, 1996 the first edition, book number ISBN7-113-02440-81U686." wayside signaling automatically controlled circuit diagram volume ", China Railway Press's in December, 1996 the first edition, book number ISBN7-113-02336-3/U663).In second class, low frequency signal produces with crystal oscillator and obtains through frequency-halving circuit repeatedly.If with 4 kinds of low frequencies, just with 4 crystal oscillators and 4 frequency dividers, if with 16 kinds of low frequencies then will use 16 crystal oscillators and 16 frequency dividers.Lower side frequency produces with crystal oscillator and frequency divider respectively on every kind of carrier frequency, goes up lower side frequency for 8 and just needs 8 crystal oscillators and 8 frequency dividers.Last lower side frequency signal is modulated into the square wave frequency-shift signaling with low-frequency square-wave signal, becomes the sinusoidal waveform frequency-shift signaling through low-pass filter again.(referring to " many information integrationizations automatic block with audio frequency shift modulated track circuit ", China Railway Press's in February, 1997 the first edition, book number ISRN7-113-02392-4/U676).The 3rd class is that French UM-71 is employed.Its carrier frequency central frequency is different fully with China, low frequency frequency and Chinese adopted also different.Its low frequency signal produces through frequency divider with crystal oscillator.Frequency divider can change divider ratio according to colour light signal.So only use a crystal oscillator, just can produce multiple low frequency signal.Its CF signal generation and modulator approach are identical with the above-mentioned first kind, use the LC oscillator.(referring to " wayside signaling automatic guidance " book).So each center carrier frequence will use a LC oscillator.
In sum, as adopting the LC oscillator, because the temperature characterisitic of lc circuit makes oscillation frequency stable inadequately, it is very difficult reaching very high precision (such as 2/1000ths).In addition, carrier frequency and low frequency use separately independently oscillator, make oscillator and frequency divider consumption very big.
The purpose of this utility model is to improve the precision of low frequency and upper and lower side frequency oscillation frequency, and a kind of crystal oscillator of very few number and frequency-shift signaling producer of frequency divider of adopting is provided.
The utility model comprises two frequency dividers and control circuit, first frequency divider by crystal oscillator, can preset the divider ratio frequency divider and preset several circuit and form, first frequency divider carries out frequency division to the frequency that crystal oscillator produces.Control circuit is made up of the microcomputer of crystal oscillator and band timer.Control circuit produces corresponding signal according to signal conditioning and transports to the several circuit of presetting of first frequency divider, producing corresponding divider ratio modulates first frequency divider, the output of first frequency divider gets the square wave frequency-shift signaling through the second frequency divider frequency division, the crystal oscillator number can be one or two, and promptly first frequency divider and control circuit can use separately or shared same crystal oscillator.Can preset the divider ratio frequency divider and preset several circuit and can be contained in microcomputer inside.
For the sine wave output frequency-shift signaling, be provided with a wave digital lowpass filter at the second frequency divider mouth, the output of second frequency divider is output again after this wave digital lowpass filter is handled.This wave digital lowpass filter can be made of the wave digital lowpass filter integrated circuit, and its clock signal can provide by presetting the divider ratio frequency divider.
The utility model generates following 8 kinds of upper and lower side frequency: 495 ± 3HZ, 605 ± 3HZ, 595 ± 3HZ, 705 ± 3HZ, 695 ± 3HZ, 805 ± 3HZ, 795 ± 3HZ, 905 ± 3HZ.
Accompanying drawing 1: be the utility model functional block diagram;
Accompanying drawing 2: be the utility model embodiment circuit block diagram;
Accompanying drawing 3: be the utility model embodiment circuit diagram.
Below the contrast accompanying drawing is elaborated to the utility model in conjunction with the embodiments.
The utility model by crystal oscillator 1, can preset divider ratio frequency divider 2, preset several circuit 3, microcomputer 5, second frequency divider 9 of band timer 6 form, can preset divider ratio frequency divider 2, preset several circuit 3 and be arranged in the microcomputer 5, crystal oscillator 1 is made of capacitor C 1, C2, crystal oscillator X1, and cross-over connection is between 18,19 pin of computing machine 5 central process units 7 (89C52), produce square wave with central process unit in-to-in oscillating circuit, oscillation frequency is 24MHZ.Second frequency divider 9 is made of frequency divider integrated circuit 74LS393, realizes 32 frequency divisions, and its output exports wave digital lowpass filter TLC04 signal input part 8 pin to through the coupled circuit that resistance R 2, R3, capacitor C constitute.Signal conditioning 8 is 6 kinds of colour light signals (white B, green L, greenish-yellow LU, yellow U, yellow UU, reddish yellow HU), also can be subdivided into three speed class SD1, SD2, SD3, be called 18 information signals on the railway, by microcomputer 2～8,13, the input of 14 pin, microcomputer 5 is set up for timer internal 6 according to signal conditioning 8 and is preset number, exporting to inside and can preset divider ratio frequency divider 2 and insert different divider ratios according to timer 6, on going out from defeated 11 pin of central process unit 7 mouths, the frequency signal of 32 times of shift frequency 89C521 of lower side frequency, 1 pin of this signal output to the second frequency divider 74LS393, through the 74LS39332 frequency division, produce the square wave frequency-shift signaling.The square wave frequency-shift signaling is delivered to signal input part 8 pin of digital filter TLC04.32 frequencys multiplication of the last lower side frequency of the 1 pin output of central process unit 7 (89C52) are also delivered to the clock of 2 pin of digital filter TLC04 as digital filter.Wave digital lowpass filter TLC04 pin 5 sine wave output frequency-shift signalings 11.
Its carrier frequency of frequency-shift signaling and modulating frequency that the utility model produces all have very high precision degree.Its precision is close with the crystal oscillator precision, has so just improved functional reliability and safety, and by increase the quantity of transmission information created condition.The utility model has used less components and parts, and the cost of components and parts is lower.Because the utility model is full-digital circuit, does not have lc circuit, so also just do not adjust problem, this brings very big facility for manufacturing with maintenance.
Claims (7)
1, a kind of railway signal system frequency-shift signaling producer, form by crystal oscillator and frequency divider, it is characterized in that: comprise two frequency dividers and control circuit, first frequency divider by crystal oscillator, can preset divider ratio frequency divider (2) and preset several circuit (3) and form; Control circuit is made up of the microcomputer (5) of crystal oscillator, band timer (6); Control circuit produces corresponding signal according to signal conditioning (8) and transports to the several circuit of presetting of first frequency divider (3), produces corresponding divider ratio first frequency divider is modulated, and the output of first frequency divider gets square wave frequency-shift signaling (10) through second frequency divider (9) frequency division; Crystal oscillator can be two or shared one.
2, railway signal system according to claim 1 frequency-shift signaling producer is characterized in that: can preset divider ratio frequency divider (2) and preset several circuit (3) and be contained in microcomputer (5) inside.
3, railway signal system according to claim 1 and 2 frequency-shift signaling producer is characterized in that: the second frequency divider mouth is provided with a wave digital lowpass filter, and second frequency divider (9) output is output again after wave digital lowpass filter is handled.
4, railway signal system according to claim 3 frequency-shift signaling producer, it is characterized in that: wave digital lowpass filter is made of the wave digital lowpass filter integrated circuit, and its clock signal provides by presetting divider ratio frequency divider (2).
5, railway signal system according to claim 1 and 2 frequency-shift signaling producer, it is characterized in that: second frequency divider (9) is made of frequency divider integrated circuit 74LS393, finish 32 frequency divisions, export through the coupled circuit that resistance (R2, R3), electric capacity (C) constitute.
6, railway signal system according to claim 1 and 2 frequency-shift signaling producer is characterized in that: produce following 8 kinds of upper and lower side frequency: 495 ± 3HZ, 605 ± 3HZ, 595 ± 3HZ, 705 ± 3HZ, 695 ± 3HZ, 805 ± 3HZ, 795 ± 3HZ, 905 ± 3HZ.
7, railway signal system according to claim 3 frequency-shift signaling producer is characterized in that: produce following 8 kinds of upper and lower side frequency: 495 ± 3HZ, 605 ± 3HZ, 595 ± 3HZ, 705 ± 3HZ, 695 ± 3HZ, 805 ± 3HZ, 795 ± 3HZ, 905 ± 3HZ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99226123 CN2368764Y (en) | 1999-03-27 | 1999-03-27 | Frequency shifting signal generator for railway signal system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99226123 CN2368764Y (en) | 1999-03-27 | 1999-03-27 | Frequency shifting signal generator for railway signal system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2368764Y true CN2368764Y (en) | 2000-03-15 |
Family
ID=34015875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99226123 Expired - Fee Related CN2368764Y (en) | 1999-03-27 | 1999-03-27 | Frequency shifting signal generator for railway signal system |
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| CN (1) | CN2368764Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103581086A (en) * | 2013-03-25 | 2014-02-12 | 柳州铁道职业技术学院 | Railway sand table frequency shift signal demodulator |
| CN103839472A (en) * | 2013-03-24 | 2014-06-04 | 柳州铁道职业技术学院 | Railway sand table frequency-shift signal generator |
| CN116962128A (en) * | 2023-09-21 | 2023-10-27 | 北京全路通信信号研究设计院集团有限公司 | Method, device, equipment and storage medium for analyzing frequency shift signal |
-
1999
- 1999-03-27 CN CN 99226123 patent/CN2368764Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103839472A (en) * | 2013-03-24 | 2014-06-04 | 柳州铁道职业技术学院 | Railway sand table frequency-shift signal generator |
| CN103581086A (en) * | 2013-03-25 | 2014-02-12 | 柳州铁道职业技术学院 | Railway sand table frequency shift signal demodulator |
| CN103581086B (en) * | 2013-03-25 | 2017-01-04 | 柳州铁道职业技术学院 | Railway sand table frequency shift signal demodulator |
| CN116962128A (en) * | 2023-09-21 | 2023-10-27 | 北京全路通信信号研究设计院集团有限公司 | Method, device, equipment and storage medium for analyzing frequency shift signal |
| CN116962128B (en) * | 2023-09-21 | 2023-12-08 | 北京全路通信信号研究设计院集团有限公司 | Method, device, equipment and storage medium for analyzing frequency shift signal |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |