CN103402159A - Digital PA noise detector head - Google Patents
Digital PA noise detector head Download PDFInfo
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- CN103402159A CN103402159A CN2013103587677A CN201310358767A CN103402159A CN 103402159 A CN103402159 A CN 103402159A CN 2013103587677 A CN2013103587677 A CN 2013103587677A CN 201310358767 A CN201310358767 A CN 201310358767A CN 103402159 A CN103402159 A CN 103402159A
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- uproar
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Abstract
The invention provides a digital PA noise detector head which comprises an RS485 circuit, an IRQ detecting circuit, an IRQ control circuit and a power supply circuit, as well as an electroacoustic device, an amplifying circuit, a rectifying and filtering circuit, and an MCU all connected in sequence, wherein the electroacoustic device is an electret microphone; the power supply circuit provides power supplies for the other parts; the IRQ detecting circuit is connected with the IRQ control circuit; the IRQ detecting circuit and the IRQ control circuit are connected with the MCU; the RS485 circuit is connected with the MCU; the output end of the RS485 circuit is connected with an RS485 bus; the RS485 bus outputs signals to a control unit of an external digital PA broadcast system; the input end of the IRQ detecting circuit is controlled by the control unit of the external digital PA broadcast system. According to the invention, the sensitivity is improved in virtue of an adopted electret; the reliable transmission of data is realized; a noise detecting circuit operates in a real-time manner, so as to enable the broadcast volume to vary with noise.
Description
Technical field
The invention belongs to the noise-monitoring equipment field, relate in particular to digital PA in a kind of broadcast system that directly the is applied in public place inspection head of making an uproar.
Background technology
At present, there are following 3 point defects in existing product: 1. the electro-acoustic element of detection noise is loud speaker, and loudspeaker sensitivity is low causes the variation of broadcasting volume slow; 2. the noise data that gathers adopts analog signal to the control unit transmission, makes volume control function easily by unknown signal, be disturbed; 3. noise monitoring can only carried out without under broadcast state, can not realize broadcasting the real-time control of volume.
Summary of the invention
For the deficiencies in the prior art, the problem to be solved in the present invention is to provide digital PA in a kind of broadcast system that the is applied in public place inspection head of making an uproar, can be for the Broadcasting Control unit provides simple and reliable ground noise data, help control unit to realize the function that the broadcasting volume changes with the fluctuation of noise.
Technical scheme of the present invention is:
a kind of digital PA inspection head of making an uproar, comprise electro-acoustic element, amplifying circuit, current rectifying and wave filtering circuit, MCU with the A/D change-over circuit, the RS485 circuit, the IRQ testing circuit, IRQ control circuit and power circuit, described electro-acoustic element are Electret condenser microphone, and described power circuit is described electro-acoustic element, described amplifying circuit, described current rectifying and wave filtering circuit, described MCU with the A/D change-over circuit, described RS485 circuit, described IRQ testing circuit and IRQ control circuit provide power supply, described electro-acoustic element, described amplifying circuit, described current rectifying and wave filtering circuit and described MCU with the A/D change-over circuit are linked in sequence successively, described IRQ testing circuit, described IRQ control circuit connects, described IRQ testing circuit be connected the IRQ control circuit and all with described MCU with the A/D change-over circuit, be connected, described RS485 circuit is connected with described MCU with the A/D change-over circuit, the output of described RS485 circuit connects the RS485 bus, described RS485 bus exports signal to the control unit of outside digital PA broadcast system, and the input of described IRQ testing circuit is controlled by the control unit of the described digital PA broadcast system in outside.
Described power circuit comprises power input and DC/DC translation circuit, the input input 24v of described power circuit, and described 24v is output 5v and 3.3v after described DC/DC translation circuit conversion.
Be provided with the reverse connection preventing surge circuit between described power input and described DC/DC translation circuit.
Be provided with isolation and protective circuit between described RS485 circuit and described RS485 bus, be provided with switch between the positive terminal of described RS485 bus and backward end.
Described IRQ testing circuit is controlled by the control unit of digital PA broadcast system.
Described MCU with the A/D change-over circuit is connected with the Flash memory.
Described MCU with the A/D change-over circuit is the STM32F103RC processor.
A kind of digital PA broadcast system, include at least two digital PA inspection heads of making an uproar as mentioned above, the make an uproar RS485 bus of inspection head of each described digital PA exports noise signal to the control unit of described digital PA broadcast system, and the control unit of described digital PA broadcast system carries out volume according to aforementioned noise signal and controls.
Advantage and good effect that the present invention has are: owing to adopting technique scheme, 1. the electro-acoustic element of noise monitoring is used electret instead, has improved sensitivity; 2. the noise data that gathers becomes digital signal through the AD circuit conversion, and noise data, to the control unit circuit, is realized the transmitting of data by the RS485 bus transfer; 3. increased the sensitivity of noise monitoring and the reliability of transfer of data, the inspection circuit real-time working of making an uproar, really realized the function that the broadcasting volume changes with noise.
Description of drawings
Fig. 1 is schematic block circuit diagram of the present invention;
Fig. 2 is the connected mode figure of a plurality of inspection heads of making an uproar.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are elaborated:
as shown in Figure 1: a kind of digital PA inspection head of making an uproar comprises electro-acoustic element, amplifying circuit, current rectifying and wave filtering circuit, MCU with the A/D change-over circuit, the RS485 circuit, the IRQ testing circuit, IRQ control circuit and power circuit, described electro-acoustic element are Electret condenser microphone, and described power circuit is described electro-acoustic element, described amplifying circuit, described current rectifying and wave filtering circuit, described MCU with the A/D change-over circuit, described RS485 circuit, described IRQ testing circuit and IRQ control circuit provide power supply, described electro-acoustic element, described amplifying circuit, described current rectifying and wave filtering circuit and described MCU with the A/D change-over circuit are linked in sequence successively, described IRQ testing circuit, described IRQ control circuit connects, described IRQ testing circuit be connected the IRQ control circuit and all with described MCU with the A/D change-over circuit, be connected, described RS485 circuit is connected with described MCU with the A/D change-over circuit, the output of described RS485 circuit connects the RS485 bus, described RS485 bus exports signal to the control unit of outside digital PA broadcast system, and the input of described IRQ testing circuit is controlled by the control unit of the described digital PA broadcast system in outside.
Described power circuit comprises power input and DC/DC translation circuit, the input input 24v of described power circuit, and described 24v is output 5v and 3.3v after described DC/DC translation circuit conversion.Output 5v and 3.3v provide DC power supply for corresponding chip.
Be provided with the reverse connection preventing surge circuit between described power input and described DC/DC translation circuit.
Be provided with isolation and protective circuit between described RS485 circuit and described RS485 bus, be provided with switch (wire jumper) between the positive terminal of described RS485 bus and backward end.
Described IRQ testing circuit is controlled by the control unit of digital PA broadcast system.
Described MCU with the A/D change-over circuit is connected with the Flash memory.
Described MCU with the A/D change-over circuit is the STM32F103RC processor.
A kind of digital PA broadcast system, include at least two digital PA inspection heads of making an uproar as mentioned above, the make an uproar RS485 bus of inspection head of each described digital PA exports noise signal to the control unit of described digital PA broadcast system, and the control unit of described digital PA broadcast system carries out volume according to aforementioned noise signal and controls.(connected mode of the inspection head of respectively making an uproar as shown in Figure 2)
Below functions implementing the present invention are described:
1. noise measuring function
● can detect broadcasting on-the-spot noise, and the numerical value that will collect is sent to the corresponding control inspection head of making an uproar, realizes that volume regulates with the variation of noise.
● electro-acoustic element adopts Electret condenser microphone, sensitivity approximately-38dB.Select general operational amplification circuit that noise signal is amplified to certain amplitude, the noise signal that half-wave rectifying circuit will be amplified is rectified into direct current signal.
● select the STM32F103RC processor with the AD conversion, convert the direct current noise signal to numerical value., by tabling look-up, draw corresponding noise level.Mapping table between noise AD value and noise sound pressure level, set up by experiment.
● noise measuring scope: 60dB～99dB.Every 3dB is one grade, totally 13 grades.Value class: 60,63,66 ... 93,96,99dB.
● effectively level of noise is the noise mean value in past one second.Algorithm is, the every 20ms run-down of program, and interscan in 1 second 50 times,, to the numerical computations mean value that obtains, obtain RMS AC noise.
2. data-transformation facility
● uploading by the RS485 bus of noise data realizes, respectively makes an uproar and examines head by monitoring IRQ condition line coordinating communication process.
● RS485 technical parameter: baud rate 9600Bps; Maximum transmission distance 800M; 30 of Maximum Payloads; Make an uproar and examine a terminal resistance 120.
● the inspection head of making an uproar the upwards data of transmission comprises: the inspection No. ID of making an uproar; RMS AC noise; Check sum.Be stored in the Flash memory.
● state is controlled (IRQ): serial bus is set in the inspection head of making an uproar takies and detect and control circuit IRQ, be used for the idle condition of identification bus, and the taking of control bus.The control unit of CPU(numeral PA broadcast system) detect the IRQ state by optocoupler; Control the IRQ state by triode, be the OC form.Each inspection electric current of letting out to IRQ of making an uproar is 1mA, and during the triode conducting, Absorption Current is 100mA.
3. the inspection leading address of making an uproar
● the inspection leading address of making an uproar is determined by wire jumper.
● the inspection leading address scope 0 to 29 of making an uproar, totally 5 of jumper terminals.
4. make an uproar and examine a power supply
● input power: DC24V ± 2V; Power consumption :～10mA.
● anti-power supply reversal connection and Anti-surging, anti-diode is taken over control in the power supply input, prevents reverse power connection.After power supply entered the inspection head of making an uproar, twin zener dioder fast in parallel, prevented surge.
5. interface definition
● socket model: PHOENIX brand 3.81 pitch socket.
● after the socket of selecting guarantees to make an uproar local terminal inspection head extracts, do not interrupt rear class make an uproar the inspection head power supply with communicate by letter.
Above one embodiment of the present of invention are had been described in detail, but described content is only preferred embodiment of the present invention, can not be considered to be used to limiting practical range of the present invention.All equalizations of doing according to the present patent application scope change and improve etc., within all should still belonging to patent covering scope of the present invention.
Claims (9)
1. digital PA inspection head of making an uproar, is characterized in that: comprise electro-acoustic element, amplifying circuit, current rectifying and wave filtering circuit, MCU with the A/D change-over circuit, the RS485 circuit, the IRQ testing circuit, IRQ control circuit and power circuit, described electro-acoustic element are Electret condenser microphone, and described power circuit is described electro-acoustic element, described amplifying circuit, described current rectifying and wave filtering circuit, described MCU with the A/D change-over circuit, described RS485 circuit, described IRQ testing circuit and IRQ control circuit provide power supply, described electro-acoustic element, described amplifying circuit, described current rectifying and wave filtering circuit and described MCU with the A/D change-over circuit are linked in sequence successively, described IRQ testing circuit, described IRQ control circuit connects, described IRQ testing circuit be connected the IRQ control circuit and all with described MCU with the A/D change-over circuit, be connected, described RS485 circuit is connected with described MCU with the A/D change-over circuit, the output of described RS485 circuit connects the RS485 bus, described RS485 bus exports signal to the control unit of outside digital PA broadcast system, and the input of described IRQ testing circuit is controlled by the control unit of the described digital PA broadcast system in outside.
2. the digital PA according to claim 1 inspection head of making an uproar, it is characterized in that: described power circuit comprises power input and DC/DC translation circuit, the input input 24v of described power circuit, described 24v is output 5v and 3.3v after described DC/DC translation circuit conversion.
3. the digital PA according to claim 1 inspection head of making an uproar, is characterized in that: be provided with the reverse connection preventing surge circuit between described power input and described DC/DC translation circuit.
4. the digital PA according to claim 1 inspection head of making an uproar, is characterized in that: be provided with isolation and protective circuit between described RS485 circuit and described RS485 bus, be provided with switch between the positive terminal of described RS485 bus and backward end.
5. the digital PA according to claim 1 inspection head of making an uproar, it is characterized in that: described IRQ testing circuit is controlled by the control unit of digital PA broadcast system.
6. the digital PA according to claim 1 inspection head of making an uproar, it is characterized in that: described MCU with the A/D change-over circuit is connected with the Flash memory.
7. according to claim 1-6 described digital PA of any one inspection head of making an uproar, it is characterized in that: described MCU with the A/D change-over circuit is the STM32F103RC processor.
8. digital PA broadcast system, it is characterized in that: include at least two as the inspection head of making an uproar of digital PA as described in any one in claim 1-6, the make an uproar RS485 bus of inspection head of each described digital PA exports noise signal to the control unit of described digital PA broadcast system, and the control unit of described digital PA broadcast system carries out volume according to aforementioned noise signal and controls.
9. digital PA broadcast system, it is characterized in that: include at least two digital PA inspection heads of making an uproar as claimed in claim 7, the make an uproar RS485 bus of inspection head of each described digital PA exports noise signal to the control unit of described digital PA broadcast system, and the control unit of described digital PA broadcast system carries out volume according to aforementioned noise signal and controls.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103587677A CN103402159A (en) | 2013-08-15 | 2013-08-15 | Digital PA noise detector head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103587677A CN103402159A (en) | 2013-08-15 | 2013-08-15 | Digital PA noise detector head |
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| CN103402159A true CN103402159A (en) | 2013-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013103587677A Pending CN103402159A (en) | 2013-08-15 | 2013-08-15 | Digital PA noise detector head |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104967940A (en) * | 2015-06-25 | 2015-10-07 | 苏州凯枫瑞电子科技有限公司 | Light induction power-off volume self-adjusting earphone |
| CN105157818A (en) * | 2015-08-28 | 2015-12-16 | 苏州市博得立电源科技有限公司 | Portable environmental noise measuring instrument |
| CN107046662A (en) * | 2017-06-20 | 2017-08-15 | 北京贝能达信息技术股份有限公司 | Track traffic broadcast multi-channel noise detection volume controller and control method |
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| CN2365827Y (en) * | 1998-12-31 | 2000-02-23 | 中国科学技术大学 | Automatic broadcasting system program control machine |
| CN201682531U (en) * | 2010-04-12 | 2010-12-22 | 上海华勤通讯技术有限公司 | Mobile phone capable of detecting environmental noise |
| US20130166227A1 (en) * | 2011-12-27 | 2013-06-27 | Utc Fire & Security Corporation | System and method for an acoustic monitor self-test |
| CN203407014U (en) * | 2013-08-15 | 2014-01-22 | 天津市北海通信技术有限公司 | Digital power amplifier (PA) noise detection head |
-
2013
- 2013-08-15 CN CN2013103587677A patent/CN103402159A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2365827Y (en) * | 1998-12-31 | 2000-02-23 | 中国科学技术大学 | Automatic broadcasting system program control machine |
| CN201682531U (en) * | 2010-04-12 | 2010-12-22 | 上海华勤通讯技术有限公司 | Mobile phone capable of detecting environmental noise |
| US20130166227A1 (en) * | 2011-12-27 | 2013-06-27 | Utc Fire & Security Corporation | System and method for an acoustic monitor self-test |
| CN203407014U (en) * | 2013-08-15 | 2014-01-22 | 天津市北海通信技术有限公司 | Digital power amplifier (PA) noise detection head |
Non-Patent Citations (1)
| Title |
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| 辛光: ""基于DSP的无线高速列车噪声监测系统设计"", 《中国优秀硕士学位论文全文库》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104967940A (en) * | 2015-06-25 | 2015-10-07 | 苏州凯枫瑞电子科技有限公司 | Light induction power-off volume self-adjusting earphone |
| CN105157818A (en) * | 2015-08-28 | 2015-12-16 | 苏州市博得立电源科技有限公司 | Portable environmental noise measuring instrument |
| CN107046662A (en) * | 2017-06-20 | 2017-08-15 | 北京贝能达信息技术股份有限公司 | Track traffic broadcast multi-channel noise detection volume controller and control method |
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Application publication date: 20131120 |