CN203405274U - Noise monitor for passenger compartment - Google Patents
Noise monitor for passenger compartment Download PDFInfo
- Publication number
- CN203405274U CN203405274U CN201320502656.4U CN201320502656U CN203405274U CN 203405274 U CN203405274 U CN 203405274U CN 201320502656 U CN201320502656 U CN 201320502656U CN 203405274 U CN203405274 U CN 203405274U
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- China
- Prior art keywords
- operational amplifier
- noise
- circuit
- capacitor
- triode
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- Expired - Fee Related
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Abstract
The utility model provides a noise monitor for a passenger compartment, which comprises a noise detection internal circuit and a peripheral circuit. The noise detection internal circuit is connected with the peripheral circuit. The noise detection internal circuit is composed of an operational amplifier and a noise probe. The noise probe is connected with the input end of the operational amplifier through a capacitor. The power supply Vcc pin of the operational amplifier is connected with the power supply Vee pin of the operational amplifier through a capacitor. The output end of the operational amplifier is connected with the base electrode of a triode. The collector electrode of the operational amplifier is connected with the Vcc pin of the operational amplifier through a resistor. The emitter electrode of the triode is connected with the Vee pin of the operational amplifier through a resistor. The peripheral circuit is in the form of a rectifier bridge circuit, wherein an interface A and an interface B are led out of the input end of the peripheral circuit. The output end of the peripheral circuit is connected with the noise detection internal circuit. The interface A and the interface B of the noise monitor can be connected arbitrarily, while equipment is protected from being damaged. Meanwhile, the noise monitor has the advantages of simple structure, convenient installation, low production cost, simple operation, control and usage, high stability and the like.
Description
Technical field
The utility model belongs to noise monitoring field, especially relates to a kind of passenger compartment noise monitor.
Background technology
At light rail, in the public voice broadcast service system of the field of traffic such as subway, in each compartment, guest room, two noise monitor devices are set, for measuring the environmental noise of guest room, noise monitor device transfers to the power amplifier in guest room by the environmental noise measuring, and is automatically adjusted the volume of broadcast by power amplifier.Traditional noise monitor complex interfaces, mainly contains power lead, noise tone frequency channel wire, and control lines etc., exist interface load construction and installation inconvenient, and cable increases the technical matterss such as cost.
Summary of the invention
Problem to be solved in the utility model is to provide a kind of passenger compartment noise monitor simple in structure, easy to use, is particluarly suitable for light rail, in the public voice broadcast service system of the field of traffic such as subway, uses.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of passenger compartment noise monitor, comprising make an uproar inspection internal circuit and peripheral circuit, described in the inspection internal circuit of making an uproar be connected with described peripheral circuit;
The described inspection internal circuit of making an uproar comprises operational amplifier, noise probe, described noise probe is connected with the negative pole of capacitor C 1, the positive pole of described capacitor C 1 is connected with the input end of operational amplifier, the power Vcc pin of described operational amplifier is connected with the positive pole of capacitor C 2, the negative pole of described capacitor C 2 is connected with the power supply Vee pin of described operational amplifier, the output terminal of described operational amplifier is connected with the base stage of triode, the collector of described triode is connected with the power Vcc pin of operational amplifier by resistance R 1, the emitter of described triode is connected with the power supply Vee pin of operational amplifier by resistance R 2,
Described peripheral circuit is the rectifier circuit that four diodes form, the input end of described rectifier circuit is drawn interface A and interface B, an output terminal of described rectifier circuit is connected with the collector of triode, and another output terminal of described rectifier circuit is linked between resistance R 2 and the negative pole of capacitor C 2.
Advantage and the good effect that the utlity model has are: owing to adopting technique scheme, the A of noise monitor, B can connect arbitrarily, can damage equipment, and can work, each noise monitor is by one two core cable transmission power supply and noise signal, and circuit is simple and reliable; Have simple in structurely, easy for installation, production cost is low, operation, control, easy to use, stability advantages of higher.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of passenger compartment noise monitor of the utility model.
Embodiment
As shown in Figure 1, a kind of passenger compartment noise monitor of the utility model, comprising make an uproar inspection internal circuit and peripheral circuit, described in the inspection internal circuit of making an uproar be connected with described peripheral circuit;
The described inspection internal circuit of making an uproar comprises operational amplifier, noise probe, described noise probe is connected with the negative pole of capacitor C 1, the positive pole of described capacitor C 1 is connected with the input end of operational amplifier, the power Vcc pin of described operational amplifier is connected with the positive pole of capacitor C 2, the negative pole of described capacitor C 2 is connected with the power supply Vee pin of described operational amplifier, the output terminal of described operational amplifier is connected with the base stage of triode, the collector of described triode is connected with the power Vcc pin of operational amplifier by resistance R 1, the emitter of described triode is connected with the power supply Vee pin of operational amplifier by resistance R 2,
Described peripheral circuit is the rectifier circuit that four diodes form, the input end of described rectifier circuit is drawn interface A and interface B, an output terminal of described rectifier circuit is connected with the collector of triode, and another output terminal of described rectifier circuit is linked between resistance R 2 and the negative pole of capacitor C 2.
The course of work of this example: during use, interface A or B are connected after power supply, enter rectifier circuit, after picking up noise by electret, by the collector of operational amplifier and triode, export, the load circuit of triode is on digital power amplifier plank, then output to power amplifier noise monitoring circuit, output after environmental noise can being amplified, each noise monitor is by one two core cable transmission power supply and noise signal, circuit is simple and reliable, four diodes form rectifier circuit, realize A, B interface connects arbitrarily, the input power of whole equipment, output noise audio frequency is all by interface A, B realizes.
Above an embodiment of the present utility model is had been described in detail, but described content is only preferred embodiment of the present utility model, can not be considered to for limiting practical range of the present utility model.All equalization variations of doing according to the utility model application range and improvement etc., within all should still belonging to patent covering scope of the present utility model.
Claims (1)
1. a passenger compartment noise monitor, is characterized in that: comprising make an uproar inspection internal circuit and peripheral circuit, described in the inspection internal circuit of making an uproar be connected with described peripheral circuit;
The described inspection internal circuit of making an uproar comprises operational amplifier, noise probe, described noise probe is connected with the negative pole of capacitor C 1, the positive pole of described capacitor C 1 is connected with the input end of operational amplifier, the power Vcc pin of described operational amplifier is connected with the positive pole of capacitor C 2, the negative pole of described capacitor C 2 is connected with the power supply Vee pin of described operational amplifier, the output terminal of described operational amplifier is connected with the base stage of triode, the collector of described triode is connected with the power Vcc pin of operational amplifier by resistance R 1, the emitter of described triode is connected with the power supply Vee pin of operational amplifier by resistance R 2,
Described peripheral circuit is the rectifier circuit that four diodes form, the input end of described rectifier circuit is drawn interface A and interface B, an output terminal of described rectifier circuit is connected with the collector of triode, and another output terminal of described rectifier circuit is linked between resistance R 2 and the negative pole of capacitor C 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320502656.4U CN203405274U (en) | 2013-08-15 | 2013-08-15 | Noise monitor for passenger compartment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320502656.4U CN203405274U (en) | 2013-08-15 | 2013-08-15 | Noise monitor for passenger compartment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203405274U true CN203405274U (en) | 2014-01-22 |
Family
ID=49941204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320502656.4U Expired - Fee Related CN203405274U (en) | 2013-08-15 | 2013-08-15 | Noise monitor for passenger compartment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203405274U (en) |
-
2013
- 2013-08-15 CN CN201320502656.4U patent/CN203405274U/en not_active Expired - Fee Related
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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: 20140122 Termination date: 20150815 |
|
| EXPY | Termination of patent right or utility model |