CN107071677A - Noise detection module - Google Patents
Noise detection module Download PDFInfo
- Publication number
- CN107071677A CN107071677A CN201610745975.6A CN201610745975A CN107071677A CN 107071677 A CN107071677 A CN 107071677A CN 201610745975 A CN201610745975 A CN 201610745975A CN 107071677 A CN107071677 A CN 107071677A
- Authority
- CN
- China
- Prior art keywords
- noise
- input
- change
- programme
- chip microcomputer
- 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.)
- Pending
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R27/00—Public address systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2227/00—Details of public address [PA] systems covered by H04R27/00 but not provided for in any of its subgroups
- H04R2227/001—Adaptation of signal processing in PA systems in dependence of presence of noise
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
- H04R2430/01—Aspects of volume control, not necessarily automatic, in sound systems
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
The present invention relates to a kind of noise detection module, including noise inputs circuit, A/D change-over circuits, single-chip microcomputer and programme-controlled gain circuit, described noise inputs circuit connects the input of A/D change-over circuits, the output end of A/D change-over circuits connects the input of single-chip microcomputer, the output end of single-chip microcomputer connects the input of programme-controlled gain circuit, and the output end of programme-controlled gain circuit connects power amplifier and Light-Emitting Diode respectively.The present invention is used to carry out automatic detection to each service area ambient noise, area's noise is detected automatically during voice signal pauses, and the audio signal in respective broadcast area is adjusted according to testing result, and the audio signal after adjustment is sent to the power-amplifier stage of each service area, each service area power amplifier output volume of Automatic Balance Regulation.
Description
Technical field
The invention belongs to broadcasting equipment field, it is related to a kind of noise detection module, the automatic detection that is particularly suitable for use in respectively is broadcasted
The ambient noise in area.
Background technology
Current subway broadcasting equipment is safing critical facility in metro operation, is meeting basic broadcast capability demand
Outside, fire broadcast function need to be taken into account.When train enters the station or be outbound, train noise is larger, need to heighten volume, when broadcasting at night
Volume need to be turned down, in order to avoid disturbing residents and being complained, and existing broadcasting equipment can not be met automatically adjusts power amplifier output according to ambient noise
The function of volume.
The content of the invention
Problem to be solved by this invention is, overcomes the deficiencies in the prior art there is provided a kind of noise detection module, can be certainly
It is dynamic to differentiate the voice signal dead time, during pausing（3 seconds）Automatically area's noise is detected, and according to testing result pair
The audio signal in respective broadcast area carries out being sent to power amplification system after accordingly decaying, and power amplifier output level will change therewith, therefore,
The regulated control of service area loudspeaker power output.
The present invention solves its technical problem and takes following technical scheme to realize：
A kind of noise detection module provided according to the present invention, including noise inputs circuit, A/D change-over circuits, single-chip microcomputer and journey
Gain circuitry is controlled, described noise inputs circuit connects the input of A/D change-over circuits, the output end connection of A/D change-over circuits
The input of single-chip microcomputer, the output end of single-chip microcomputer connects the input of programme-controlled gain circuit, the output end point of programme-controlled gain circuit
Lian Jie not power amplifier and Light-Emitting Diode.
The present invention has significant advantage and beneficial effect compared with prior art：
Due to the present invention can according to scene actual noise adjust automatically broadcast system power output, make the volume of Live Audio
Automatically adjusted according to the size of live noise, such as when train enter the station noise it is larger when, broadcast volume increase automatically, when the stream of people is few
Ambient noise hour, broadcast volume is turned down automatically.The present invention is used to carry out automatic detection to each service area ambient noise, in speech
Signal is detected to area's noise automatically during pausing, and the audio signal in respective broadcast area is adjusted according to testing result
It is whole, and the audio signal after adjustment is sent to the power-amplifier stage of each service area, each service area power amplification of Automatic Balance Regulation
Device output volume.The broadcast behavior effect of whole broadcast system is improved, is preferably commuter service.
The embodiment of the present invention is shown in detail by following examples and its accompanying drawing.
Brief description of the drawings
Fig. 1 is schematic block circuit diagram of the invention；
Fig. 2 is one of main board circuit diagram of the present invention；
Fig. 3 is the two of the main board circuit diagram of the present invention；
Fig. 4 is external structure installation diagram of the invention.
Wherein：1st, front panel, 2, main circuit board, 3, output wiring of input power source terminal plug.
Embodiment
A kind of noise detection module as shown in Figures 1 to 3, including noise inputs circuit, A/D change-over circuits, single-chip microcomputer and
Programme-controlled gain circuit, described noise inputs circuit connects the input of A/D change-over circuits, and the output end of A/D change-over circuits connects
The input of single-chip microcomputer is connect, the output end of single-chip microcomputer connects the input of programme-controlled gain circuit, the output end of programme-controlled gain circuit
Power amplifier and Light-Emitting Diode are connected respectively.
The present invention can detect to four service areas, each two test points of service area, totally eight test points, each
Test point is distinguished the noise signal of pickup through eight road noise inputs circuits by noise transducer pickoff signals, each noise transducer
Amplification, and be converted to modulus is sent to after direct current signal（A/D）Change-over circuit.Because eight tunnel noise detecting circuits are by eight measurements
Amplifier and linear DC change-over circuit are constituted, with higher input impedance and higher conjugated analoging systeming ratio, to small difference
Mould signal has larger amplification, and the actual noise level of each noise spot can be detected exactly.
A/D change-over circuits are under the control of single-chip microcomputer, to one or several points in four areas（Each two detections of service area
Point）Noise be sampled, and be converted to digital quantity and be sent in single-chip microcomputer and carry out a series of processing, the noise of each test point
Linear DC converting circuit is transformed to direct current, and to two test points of each service area, each test point is carried out 256 times
Sampling, is configured numeric ratio relatively processing by software, improves the anti-interference of equipment.
Single-chip microcomputer controls programmed gain control circuit, under the control of single-chip microcomputer, journey according to the result of sampled data
The audio signal for four service areas that control gain control circuit is sent to station console carries out every grade and is not less than 1.5 decibels, altogether
The decay of level Four, is sent to the power-amplifier stage of each service area, and each area's power amplifier output power is automatically adjusted to reach
Purpose, and the attenuation to each service area input signal is shown by LED.
External structure installation diagram as shown in Figure 4, front panel 1, the connection output wiring of input power source terminal of main circuit board 2 are inserted
First 3.
Claims (1)
1. a kind of noise detection module, including noise inputs circuit, A/D change-over circuits, single-chip microcomputer and programme-controlled gain circuit, it is special
Levy and be：Described noise inputs circuit connects the input of A/D change-over circuits, the output end connection monolithic of A/D change-over circuits
The input of machine, the output end of single-chip microcomputer connects the input of programme-controlled gain circuit, and the output end of programme-controlled gain circuit connects respectively
Connect power amplifier and Light-Emitting Diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610745975.6A CN107071677A (en) | 2016-08-29 | 2016-08-29 | Noise detection module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610745975.6A CN107071677A (en) | 2016-08-29 | 2016-08-29 | Noise detection module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107071677A true CN107071677A (en) | 2017-08-18 |
Family
ID=59617182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610745975.6A Pending CN107071677A (en) | 2016-08-29 | 2016-08-29 | Noise detection module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107071677A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110072174A (en) * | 2019-05-21 | 2019-07-30 | 北京京海鸣电子技术研究所 | Volume adaptive identifying machine |
| CN111065192A (en) * | 2020-01-17 | 2020-04-24 | 四川众兴华业市政照明工程有限公司 | Control system based on wisdom street lamp |
-
2016
- 2016-08-29 CN CN201610745975.6A patent/CN107071677A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110072174A (en) * | 2019-05-21 | 2019-07-30 | 北京京海鸣电子技术研究所 | Volume adaptive identifying machine |
| CN111065192A (en) * | 2020-01-17 | 2020-04-24 | 四川众兴华业市政照明工程有限公司 | Control system based on wisdom street lamp |
| CN111065192B (en) * | 2020-01-17 | 2021-12-17 | 四川众兴华业市政照明工程有限公司 | Control system based on wisdom street lamp |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170818 |