CN203407014U - Digital power amplifier (PA) noise detection head - Google Patents
Digital power amplifier (PA) noise detection head Download PDFInfo
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- CN203407014U CN203407014U CN201320499998.5U CN201320499998U CN203407014U CN 203407014 U CN203407014 U CN 203407014U CN 201320499998 U CN201320499998 U CN 201320499998U CN 203407014 U CN203407014 U CN 203407014U
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- circuit
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- irq
- uproar
- broadcast system
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Abstract
The utility model provides a digital power amplifier (PA) noise detection head, which comprises an RS485 circuit, an IRQ detection circuit, an IRQ control circuit, a power supply circuit, an electroacoustic device, an amplifying circuit, a rectifier and filter circuit and an MCU. The electroacoustic device, the amplifying circuit, the rectifier and filter circuit and the MCU are sequentially connected in order. The electroacoustic device is composed of an electret microphone. All the above parts are powered up by the power supply circuit. The IRQ detection circuit and the IRQ control circuit are connected together. Both the IRQ detection 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. Signals are outputted to the control unit of an external digital PA broadcast system through the RS485 bus. The input end of the IRQ detection circuit is controlled by the control unit of the external digital PA broadcast system. According to the technical scheme of the utility model, due to the adoption of an electret, the sensitivity of the noise detection head is improved and the reliable transmission of data is realized. Meanwhile, the noise detection circuit of the noise detection head is operated in real time, so that the broadcasting volume can be varied along with the variation of noises.
Description
Technical field
The utility model belongs to noise-monitoring equipment field, relates in particular to digital PA in a kind of broadcast system that is directly the 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 broadcast volume slow; 2. the noise data gathering adopts analog signal to control unit transmission, and volume control function is easily disturbed by unknown signal; 3. noise monitoring can only carried out without under broadcast state, can not realize the real-time control of broadcast volume.
Summary of the invention
For the deficiencies in the prior art, problem to be solved in the utility model 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 Broadcasting Control unit provides simple and reliable ground noise data, help control unit to realize the function that broadcast volume changes with the fluctuation of noise.
The technical solution of the utility model is:
The PA inspection head of making an uproar, comprises electro-acoustic element, amplifying circuit, current rectifying and wave filtering circuit, MCU with A/D change-over circuit, RS485 circuit, IRQ testing circuit, IRQ control circuit and power circuit, described electro-acoustic element is Electret condenser microphone, described power circuit is described electro-acoustic element, described amplifying circuit, described current rectifying and wave filtering circuit, the described MCU with 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 A/D change-over circuit are linked in sequence successively, described IRQ testing circuit, described IRQ control circuit connects, described IRQ testing circuit is all connected with the described MCU with A/D change-over circuit with described IRQ control circuit, described RS485 circuit is connected with the described MCU with A/D change-over circuit, the output of described RS485 circuit connects 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 exports 5v and 3.3v after described DC/DC translation circuit conversion.
Between described power input and described DC/DC translation circuit, be provided with reverse connection preventing surge circuit.
Between described RS485 circuit and described RS485 bus, be provided with isolation and protective circuit, between the positive terminal of described RS485 bus and backward end, be provided with switch.
Described IRQ testing circuit is controlled by the control unit of digital PA broadcast system.
The described MCU with A/D change-over circuit is connected with Flash memory.
The described MCU with A/D change-over circuit is STM32F103RC processor.
A kind of digital PA broadcast system, include at least two digital PA inspection heads of making an uproar as mentioned above, described in each, the make an uproar RS485 bus of inspection head of 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 control according to aforementioned noise signal.
Advantage and the good effect that the utlity model 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 gathering becomes digital signal through AD circuit conversion, and noise data to control unit circuit, is realized the transmitting of data by 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, has really realized the function that broadcast volume changes with noise.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present utility model;
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 embodiment of the utility model is 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 A/D change-over circuit, RS485 circuit, IRQ testing circuit, IRQ control circuit and power circuit, described electro-acoustic element is Electret condenser microphone, described power circuit is described electro-acoustic element, described amplifying circuit, described current rectifying and wave filtering circuit, the described MCU with 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 A/D change-over circuit are linked in sequence successively, described IRQ testing circuit, described IRQ control circuit connects, described IRQ testing circuit is all connected with the described MCU with A/D change-over circuit with described IRQ control circuit, described RS485 circuit is connected with the described MCU with A/D change-over circuit, the output of described RS485 circuit connects 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 exports 5v and 3.3v after described DC/DC translation circuit conversion.Output 5v and 3.3v provide DC power supply for corresponding chip.
Between described power input and described DC/DC translation circuit, be provided with reverse connection preventing surge circuit.
Between described RS485 circuit and described RS485 bus, be provided with isolation and protective circuit, between the positive terminal of described RS485 bus and backward end, be provided with switch (wire jumper).
Described IRQ testing circuit is controlled by the control unit of digital PA broadcast system.
The described MCU with A/D change-over circuit is connected with Flash memory.
The described MCU with A/D change-over circuit is STM32F103RC processor.
A kind of digital PA broadcast system, include at least two digital PA inspection heads of making an uproar as mentioned above, described in each, the make an uproar RS485 bus of inspection head of 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 control according to aforementioned noise signal.(connected mode of the inspection head of respectively making an uproar as shown in Figure 2)
Below function of the present utility model is realized and being described:
1. noise measuring function
● can detect broadcasting on-the-spot noise, and the numerical value collecting is sent to the corresponding control inspection head of making an uproar, realize volume and regulate 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, half-wave rectifying circuit is rectified into direct current signal by the noise signal of amplification.
● select the STM32F103RC processor with AD conversion, convert 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, sets 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 obtaining, obtains RMS AC noise.
2. data-transformation facility
● uploading by RS485 bus of noise data realizes, and the inspection head of respectively making an uproar is 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 a upwards packet for transmission contains: the inspection No. ID of making an uproar; RMS AC noise; Check sum.Be stored in Flash memory.
● state is controlled (IRQ): serial bus is set in the inspection head of making an uproar and takies and detect and control circuit IRQ, and for the idle condition of identification bus, and the taking of control bus.The control unit of CPU(numeral PA broadcast system) by optocoupler, detect IRQ state; By triode, controlling IRQ state, is OC form.Each inspection electric current of letting out to IRQ of making an uproar is 1mA, and during 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-reverse power connection and Anti-surging, anti-diode is taken over control in power supply input, prevents reverse power connection.Power supply enters makes an uproar after inspection head, and twin zener dioder fast in parallel, prevents 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 inspection head power supply with communicate by letter.
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 (9)
1. the 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 A/D change-over circuit, RS485 circuit, IRQ testing circuit, IRQ control circuit and power circuit, described electro-acoustic element is Electret condenser microphone, described power circuit is described electro-acoustic element, described amplifying circuit, described current rectifying and wave filtering circuit, the described MCU with 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 A/D change-over circuit are linked in sequence successively, described IRQ testing circuit, described IRQ control circuit connects, described IRQ testing circuit is all connected with the described MCU with A/D change-over circuit with described IRQ control circuit, described RS485 circuit is connected with the described MCU with A/D change-over circuit, the output of described RS485 circuit connects 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 exports 5v and 3.3v after described DC/DC translation circuit conversion.
3. the digital PA according to claim 2 inspection head of making an uproar, is characterized in that: between described power input and described DC/DC translation circuit, be provided with reverse connection preventing surge circuit.
4. the digital PA according to claim 1 inspection head of making an uproar, is characterized in that: between described RS485 circuit and described RS485 bus, be provided with isolation and protective circuit, between the positive terminal of described RS485 bus and backward end, be provided with switch.
5. the digital PA according to claim 1 inspection head of making an uproar, 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, is characterized in that: the described MCU with A/D change-over circuit is connected with Flash memory.
7. according to the inspection head of making an uproar of the digital PA described in claim 1-6 any one, it is characterized in that: the described MCU with A/D change-over circuit is STM32F103RC processor.
8. a digital PA broadcast system, it is characterized in that: include at least two digital PA inspection heads of making an uproar as described in any one in claim 1-6, described in each, the make an uproar RS485 bus of inspection head of 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 control according to aforementioned noise signal.
9. a 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, described in each, the make an uproar RS485 bus of inspection head of 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 control according to aforementioned noise signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320499998.5U CN203407014U (en) | 2013-08-15 | 2013-08-15 | Digital power amplifier (PA) noise detection head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320499998.5U CN203407014U (en) | 2013-08-15 | 2013-08-15 | Digital power amplifier (PA) noise detection head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203407014U true CN203407014U (en) | 2014-01-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320499998.5U Expired - Lifetime CN203407014U (en) | 2013-08-15 | 2013-08-15 | Digital power amplifier (PA) noise detection head |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103402159A (en) * | 2013-08-15 | 2013-11-20 | 天津市北海通信技术有限公司 | Digital PA noise detector head |
| CN106210977A (en) * | 2016-07-15 | 2016-12-07 | 柳州国淘科技有限公司 | A kind of public place is automatically adjusted device and the control method of broadcast volume |
-
2013
- 2013-08-15 CN CN201320499998.5U patent/CN203407014U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103402159A (en) * | 2013-08-15 | 2013-11-20 | 天津市北海通信技术有限公司 | Digital PA noise detector head |
| CN106210977A (en) * | 2016-07-15 | 2016-12-07 | 柳州国淘科技有限公司 | A kind of public place is automatically adjusted device and the control method of broadcast volume |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140122 |