CN203275592U - Audio frequency track circuit test system - Google Patents
Audio frequency track circuit test system Download PDFInfo
- Publication number
- CN203275592U CN203275592U CN2013203302004U CN201320330200U CN203275592U CN 203275592 U CN203275592 U CN 203275592U CN 2013203302004 U CN2013203302004 U CN 2013203302004U CN 201320330200 U CN201320330200 U CN 201320330200U CN 203275592 U CN203275592 U CN 203275592U
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- CN
- China
- Prior art keywords
- audio frequency
- track circuit
- chip microcomputer
- frequency track
- relay
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Train Traffic Observation, Control, And Security (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Measuring Frequencies, Analyzing Spectra (AREA)
Abstract
The utility model discloses an audio frequency track circuit test system, comprising an audio frequency track circuit, a one-chip microcomputer, an amplitude limit circuit, a first filter, a first waveform converter, a relay, a second filter, an amplifier, a second waveform converter, a liquid crystal display screen and a button; an output terminal of the audio frequency track circuit is in connection with the one-chip microcomputer successively through the amplitude limit circuit, the first filter and the first waveform converter; the output terminal of the audio frequency track circuit is also in connection with the one-chip microcomputer successively through a normally open switch of the relay, the second filter, the amplifier and the second waveform converter; the liquid crystal display screen and the button are both in connection with the one-chip microcomputer; the relay is controlled by the one-chip microcomputer. The audio frequency track circuit test system can test the carrier frequency and mode of an audio frequency track circuit, is simple and general, has low price and is convenient to install.
Description
Technical field
The utility model relates to a kind of audio frequency track circuit test macro.
Background technology
In city rail traffic signal system in recent years, the development along with Digital Electronic Technique has high reliability, and the digital coded audio frequency track circuit of multiple data quantity comes out and paid attention to more and more at large.Audio frequency track circuit is divided into a plurality of sections to track circuit, checks and whether supervise these track sections idle, and free time/occupied information is passed to interlocking system.In order to prevent that between adjacent sections, string frequently, uses different center frequency and different bit pattern to distinguish.By the bit pattern pulse, the centre frequency of section is modulated into frequency shift keying signal (FSK), with the interference of harmonic current in opposing rail traction current.Therefore design a kind of simple, general, low price, test macro easy for installation is tested carrier frequency and the bit pattern of audio frequency track circuit, is an important research topic.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of audio frequency track circuit test macro, can test to carrier frequency and the bit pattern of audio frequency track circuit simple, general, low price, easy for installation.
The technical solution of utility model is as follows:
A kind of audio frequency track circuit test macro comprises audio frequency track circuit, single-chip microcomputer, amplitude limiter circuit, the first wave filter, the first waver, relay, the second wave filter, amplifier, the second waver, LCDs and button;
The output terminal of described audio frequency track circuit is connected with single-chip microcomputer by amplitude limiter circuit, the first wave filter and the waver of being connected successively;
The output terminal of described audio frequency track circuit also is connected with single-chip microcomputer by normal open switch, the second wave filter, amplifier and the waver of being connected of described relay successively;
Described LCDs and button all are connected with single-chip microcomputer, and relay is controlled by single-chip microcomputer.
Beneficial effect: audio frequency track circuit test macro of the present utility model, can test to carrier frequency and the bit pattern of audio frequency track circuit simple, general, low price, easy for installation.
Description of drawings
Fig. 1 is the theory diagram of the utility model audio frequency track circuit test macro.
Embodiment
Below with reference to the drawings and specific embodiments, the utility model is described in further details:
Embodiment 1:
As shown in Figure 1, a kind of audio frequency track circuit test macro comprises audio frequency track circuit, single-chip microcomputer, amplitude limiter circuit, the first wave filter, the first waver, relay, the second wave filter, amplifier, the second waver, LCDs and button;
The output terminal of described audio frequency track circuit is connected with single-chip microcomputer by amplitude limiter circuit, the first wave filter and the waver of being connected successively;
The output terminal of described audio frequency track circuit also is connected with single-chip microcomputer by normal open switch, the second wave filter, amplifier and the waver of being connected of described relay successively;
Described LCDs and button all are connected with single-chip microcomputer, and relay is controlled by single-chip microcomputer.
The course of work: the output signal of amplitude limiter circuit audio reception track circuit, export-restriction is at the voltage signal of clipping lever, signal after amplitude limit is by the first filter filtering, stay pure sound signal, convert good square-wave signal to by the first waver again, give single-chip microcomputer, single-chip microcomputer detects signal, calculates carrier frequency.after single-chip microcomputer calculates the carrier frequency result, giving LCDs with the carrier frequency data shows, drive simultaneously relay, the coil electricity of relay, the closing of contact, connect the second wave filter, the second wave filter is chosen the corresponding low frequency signal of bit pattern, then amplify through amplifier, convert square-wave signal to through the second waver again, give single-chip microcomputer, the single-chip microcomputer timer is according to the carrier frequency that calculates, measure the positive and negative half band-width of the corresponding low frequency signal of bit pattern in one-period, reconvicting, it is 0 or 1, namely recovered modulating pulse, thereby realized the measurement of bit pattern, draw bit pattern, giving LCDs shows.Wherein button is used for the switching of carrier frequency measurement and the switching of multichannel carrier frequency measurement.
Audio frequency track circuit test macro of the present utility model can be tested to carrier frequency and the bit pattern of audio frequency track circuit simple, general, low price, easy for installation.
Claims (1)
1. audio frequency track circuit test macro, it is characterized in that, comprise audio frequency track circuit, single-chip microcomputer, amplitude limiter circuit, the first wave filter, the first waver, relay, the second wave filter, amplifier, the second waver, LCDs and button;
The output terminal of described audio frequency track circuit is connected with single-chip microcomputer by amplitude limiter circuit, the first wave filter and the waver of being connected successively;
The output terminal of described audio frequency track circuit also is connected with single-chip microcomputer by normal open switch, the second wave filter, amplifier and the waver of being connected of described relay successively;
Described LCDs and button all are connected with single-chip microcomputer, and relay is controlled by single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203302004U CN203275592U (en) | 2013-06-08 | 2013-06-08 | Audio frequency track circuit test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203302004U CN203275592U (en) | 2013-06-08 | 2013-06-08 | Audio frequency track circuit test system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203275592U true CN203275592U (en) | 2013-11-06 |
Family
ID=49505969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203302004U Expired - Fee Related CN203275592U (en) | 2013-06-08 | 2013-06-08 | Audio frequency track circuit test system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203275592U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106707132A (en) * | 2015-11-12 | 2017-05-24 | 镇江市清安电器有限公司 | Audio track circuit section detection device |
-
2013
- 2013-06-08 CN CN2013203302004U patent/CN203275592U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106707132A (en) * | 2015-11-12 | 2017-05-24 | 镇江市清安电器有限公司 | Audio track circuit section detection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131106 Termination date: 20150608 |
|
| EXPY | Termination of patent right or utility model |