CN209710319U - A kind of education sound reinforcement system - Google Patents
A kind of education sound reinforcement system Download PDFInfo
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- CN209710319U CN209710319U CN201920982128.0U CN201920982128U CN209710319U CN 209710319 U CN209710319 U CN 209710319U CN 201920982128 U CN201920982128 U CN 201920982128U CN 209710319 U CN209710319 U CN 209710319U
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Abstract
The utility model discloses a kind of education sound reinforcement system, microphone array directive property is preferable.A kind of education sound reinforcement system, including the microphone array being successively electrically connected, microphone driving circuit, broad-band EDFA circuit, a/d conversion device, dsp processor, DA conversion equipment, loudspeaker driving circuit and loudspeaker, the microphone array includes multiple microphones, the multiple microphone is alternatively arranged along an arc, the microphone array is symmetrical arranged, in addition to the microphone for being located at arc middle position, any microphone is adjacent to the arc length d2 that the arc length d1 between the neighboring microphones of arc middle position side is less than between its neighboring microphones far from arc middle position side.
Description
Technical field
The utility model belongs to public address application field, is related to a kind of education sound reinforcement system.
Background technique
In the environment such as such as classroom, since room is larger, it usually needs sound reinforcement system could allow last to arrange student
Also the teaching of dais teacher can be caught.As shown in Figure 1, audio signal is defeated by speaker system in education sound reinforcement system
Out, by being exported again by speaker system after being amplified after microphone pickup by power amplifier, speaker system-microphone is formed
Positive feedback between amplifier-speaker system.Although sound reinforcement system can contribute to teachers, deal with improperly,
New problem can be introduced.Existing sound reinforcement system picks up the sound of speaking of teacher etc. using single or multiple microphones, however, mesh
Microphone directive property used by preceding sound reinforcement system is poor, influences public address effect.
Utility model content
The purpose of the utility model is to provide a kind of education sound reinforcement system, microphone array directive property is preferable.
In order to achieve the above objectives, a kind of technical solution that the utility model uses are as follows:
A kind of education sound reinforcement system, including microphone array, the microphone driving circuit, broadband beams being successively electrically connected
Form circuit, a/d conversion device, dsp processor, DA conversion equipment, loudspeaker driving circuit and loudspeaker, the microphone array
Column include multiple microphones, and the multiple microphone is alternatively arranged along an arc, and the microphone array is symmetrical arranged, except being located at
Outside the microphone in arc middle position, any microphone is adjacent to the arc between the neighboring microphones of arc middle position side
Long d1 is less than the arc length d2 between its neighboring microphones far from arc middle position side.
Preferably, arc length d2 is twice of arc length d1.
Preferably, the multiple microphone is divided into multiple groups, the corresponding frequency band of every group of microphone, the broadband beams shape
It include multiple groups microphone channel, multiple first add circuits and second add circuit, each microphone channel point at circuit
The bandwidth-limited circuit and a gain circuitry that Bao Kuo do not concatenate mutually, each bandwidth-limited circuit respectively with a Mike
Wind facies should connect, and the corresponding frequency band of microphone channel described in every group is simultaneously made of multiple microphone channels of the corresponding frequency band,
Each first add circuit is connected with the gain circuitry of corresponding one group of microphone channel to each in identical frequency band respectively
The output of microphone is overlapped to form present band output, and second add circuit and the multiple first add circuit connect
It connects to export superposition to all frequency bands and form total output.
It is highly preferred that the bandwidth-limited circuit include a first capacitor, second capacitor, a first resistor,
One 3rd resistor and an operational amplifier；The input terminal of the first resistor connection bandwidth-limited circuit；Second electricity
Appearance is connected between the first resistor and the inverting input terminal of the operational amplifier；One end of the first capacitor is connected to
Between the first resistor and second capacitor, the other end is connected to the output end of the operational amplifier；The third electricity
One end of resistance is connected between second capacitor and the inverting input terminal of the operational amplifier, and the other end is connected to the fortune
Calculate the output end of amplifier.
Further, the bandwidth-limited circuit further includes a second resistance；One end of the second resistance is connected to
Between the first resistor and the second capacitor, other end ground connection；The non-inverting input terminal of the operational amplifier is grounded.
It is highly preferred that the gain circuitry includes the 4th resistance and an operational amplifier, the 4th resistance connects
The input terminal of gain circuitry is connect, the reverse input end of the operational amplifier connects the 4th resistance, the operational amplifier
Non-inverting input terminal ground connection.
Further, the gain circuitry further include be parallel to the operational amplifier inverting input terminal and output end it
Between the 5th resistance.
It is highly preferred that first add circuit has multiple input terminals, first add circuit includes multiple resistance
An and operational amplifier, wherein the inverting input terminal of operational amplifier is connected to after each input terminal and a resistance concatenation,
First add circuit further includes the resistance being parallel between the inverting input terminal and output end of the operational amplifier, described
The non-inverting input terminal of operational amplifier is grounded.
It is highly preferred that second add circuit has multiple input terminals, second add circuit includes multiple resistance
An and operational amplifier, wherein the inverting input terminal of operational amplifier is connected to after each input terminal and a resistance concatenation,
Second add circuit further includes the resistance being parallel between the inverting input terminal and output end of the operational amplifier, described
The non-inverting input terminal of operational amplifier is grounded.
The utility model uses above scheme, has the advantages that compared with prior art
Using arc microphone array, there is focusing, enhance directive property；And microphone array uses non-homogeneous point
Cloth can reduce microphone number in the case where drawing diameter on an equal basis, reduce hardware cost；It, can be further using arc microphone array
Feedback path gain when reducing public address reduces the probability for generation of uttering long and high-pitched sounds.
Detailed description of the invention
It, below will be to needed in embodiment description in order to illustrate more clearly of the technical solution of the utility model
Attached drawing is briefly described, it should be apparent that, the drawings in the following description are merely some embodiments of the present invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the acoustic feedback schematic diagram of sound reinforcement system；
Fig. 2 is the structural block diagram of the education sound reinforcement system of embodiment；
Fig. 3 is the spacing schematic diagram of microphone array；
Fig. 4 is the structural block diagram of broad-band EDFA circuit；
Fig. 5 is the circuit diagram of bandwidth-limited circuit；
Fig. 6 is the circuit diagram of gain circuitry；
Fig. 7 is the circuit diagram of the first add circuit.
Specific embodiment
The preferred embodiment of the utility model is described in detail with reference to the accompanying drawing, so that the advantages of the utility model
It can be easier to be understood by the person skilled in the art with feature.It should be noted that for the explanation of these embodiments
It is used to help understand the utility model, but does not constitute the restriction to the utility model.In addition, sheet disclosed below is practical new
Involved technical characteristic can be combined with each other as long as they do not conflict with each other in each embodiment of type.
The present embodiment provides a kind of education sound reinforcement systems, are applied to classroom etc. and educate in scene.It, should referring to shown in Fig. 2
Anti- sound reinforcement system of uttering long and high-pitched sounds includes:
Microphone array is used to acquire the sound to public address region；
Microphone driving circuit is used to driving the microphone system to work, the microphone driving circuit and described
Microphone array is electrically connected；
Broad-band EDFA circuit is used to carry out Wave beam forming, the broad-band EDFA circuit and the microphone
Driving circuit is electrically connected；
A/d conversion device is used to convert analog signals into digital signal, the a/d conversion device and the broadband wave
Beam forms circuit and is electrically connected；
Dsp processor, is used to execute anti-public address method of uttering long and high-pitched sounds as described above, and the dsp processor and the AD turn
Changing device is electrically connected；
DA conversion equipment is used to convert digital signals into analog signal, the DA conversion equipment and DSP processing
Device is electrically connected；And
Loudspeaker driving circuit is used for drive the speaker and converts electrical signals to acoustical signal, the speaker drive electricity
Road and the DA conversion equipment and the loudspeaker are electrically connected.
In conjunction with shown in Fig. 2 and Fig. 3, microphone array includes multiple microphones, and the multiple microphone is along an arc interval
Arrangement.The microphone array is symmetrical arranged, and in addition to the microphone for being located at arc middle position, any microphone is adjacent to arc
Arc length d1 between the neighboring microphones of shape middle position side is less than and its adjacent Mike far from arc middle position side
Arc length d2 between wind.In the present embodiment, arc length d2 is twice of arc length d1.It applies in education sound reinforcement system, microphone
Array is for receiving teachers sound, and by reducing feedback path gain using the directive property of microphone array, reduction is uttered long and high-pitched sounds
The probability of generation；Microphone array non-uniform Distribution reduces microphone number while using larger diameter on circular arc, compared with
A big diameter can obtain better low frequency directivity effect, and non-uniform Distribution can reduce microphone number, reduce hardware
Cost.The radian spacing of non-uniform Distribution microphone increases since intermediate according to multiple.Microphone array has in the present embodiment
Body is provided that
A, divided band, educational system mainly consider voice public address, voice frequency be mainly distributed on [300,4000] Hz it
Between, while to improve voice quality, systematic sampling rate is set as 16 kHz.It is 500 Hz of center frequency according to octave divided band
([353Hz、707Hz])、1 kHz([707Hz、1414Hz])、2 kHz([1414Hz、2828Hz])、4 kHz([2828Hz、
5657Hz]) and 6 kHz ([5657Hz, 8000Hz]) five sections.
B, as shown in figure 3, different Mikes to be distributed to different frequency bands according to frequency band division, wherein [0,1,2] point
6 kHz of dispensing, microphone spacing are 1 cm, and [0,2,3] distributes to 4 kHz, and microphone spacing is 2 cm, [0,3,4] point
2 kHz of dispensing, microphone spacing are 4 cm, and [0,4,5] distributes to 1 kHz, and microphone spacing is 8 cm, [0,5,6] point
500 Hz of dispensing, microphone spacing are 16 cm.
C, finally according to physical length size, the linear array in Fig. 6 is bent into circular array, there is linear array itself front to refer to
Tropism, after forming circular array, due to the natural focusing of circular arc, circular array has better directive property.Because teacher generally exists
Circular array is directed toward dais region by dais regional activity.
Microphone driving circuit can work normally microphone for providing microphone bias voltage.
Broad-band EDFA circuit in analog domain for carrying out Wave beam forming.Fig. 4 shows the width of the present embodiment use
Band Wave beam forming circuit, the broad-band EDFA circuit include multiple groups microphone channel, multiple first add circuits and one
Second add circuit, each microphone channel respectively include mutually concatenate bandwidth-limited circuit and a gain circuitry,
Each bandwidth-limited circuit is connected with a microphone respectively, and the corresponding frequency band of microphone channel described in every group is simultaneously somebody's turn to do by corresponding
Multiple microphone channels of frequency band form, and each first add circuit is electric with the gain of corresponding one group of microphone channel respectively
Road connection is overlapped to form present band output, second add circuit with the output to each microphone in identical frequency band
It is connect with the multiple first add circuit to export superposition to all frequency bands and form total output.
Fig. 5 shows a bandwidth-limited circuit in Fig. 4.Referring to Figure 5, bandwidth-limited circuit includes one first
Capacitor C1, a second capacitor C2, a first resistor R1, a second resistance R2, a 3rd resistor R3 and an operation
Amplifier U1.The input terminal MIC_IN of first resistor R1 connection bandwidth-limited circuit is the output of corresponding microphone；Second electricity
Hold C2 to be connected between first resistor R1 and the inverting input terminal of operational amplifier U1；One end of first capacitor C1 is connected to first
Between resistance R1 and the second capacitor C2, the other end is connected to the output end V12 of operational amplifier U1；One end of 3rd resistor R3 connects
It is connected between the second capacitor C2 and the inverting input terminal of operational amplifier U1, the other end is connected to the output end of operational amplifier U1
V12；One end of second resistance R2 is connected between first resistor R1 and the second capacitor C2, other end ground connection；Operational amplifier U1
Non-inverting input terminal ground connection.The bandwidth-limited circuit is specially negative-feedback biquadratic bandwidth-limited circuit.
Fig. 6 shows a gain circuitry in Fig. 4.Referring to shown in Fig. 6, the gain circuitry and band logical shown in fig. 5 filter
Wave circuit connection, the output V12 of bandwidth-limited circuit are the input terminal V12 for being used as the gain circuitry.The gain circuitry includes one
An a 4th resistance R4 and operational amplifier U2, the reversed input of the 4th resistance R4 connection input terminal V12, operational amplifier U2
The 4th resistance of end connection, the non-inverting input terminal ground connection of operational amplifier U2.The gain circuitry further includes being parallel to operational amplifier
The 5th resistance R5 between the inverting input terminal and output end V23_1 of U2.The output of the gain circuitry is that a certain microphone is logical
The output in road.
Fig. 7 shows first add circuit in Fig. 4.Referring to shown in Fig. 7, which has multiple defeated
Enter and holds V23_1, V23_2, V23_3, V23_4 and V23_5, the output of 5 microphone channels of respectively a certain frequency band.This first
Add circuit includes multiple resistance and an operational amplifier U3, wherein is connected after input terminal V23_1 and the 6th resistance R6 concatenation
In the inverting input terminal of operational amplifier U3, it is connected to operational amplifier U3's after input terminal V23_2 and the 7th resistance R7 concatenation
The inverting input terminal of operational amplifier U3, input terminal are connected to after inverting input terminal, input terminal V23_3 and the 8th resistance R8 concatenation
The inverting input terminal of operational amplifier U3, input terminal V23_5 and the tenth resistance are connected to after V23_4 and the 9th resistance R9 concatenation
The inverting input terminal of operational amplifier U3 is connected to after R10 concatenation.The non-inverting input terminal of operational amplifier U3 is grounded.This first plus
Method circuit further includes the eleventh resistor being parallel between the inverting input terminal and output end V34_1 of the operational amplifier U3
R11.The output of first add circuit is the output of all microphones of a certain frequency band.
The structure of second add circuit is substantially with the first add circuit shown in Fig. 7, and difference is, the second add circuit
Multiple input terminals are connected with the output end of each first add circuit, i.e., by the output of all frequency bands of each first add circuit output
It is overlapped as input, and to it, forms total output of broad-band EDFA circuit.
The detailed process of broad-band EDFA circuit is as follows:
I, according to the division in above-mentioned steps a, each group of frequency band is made of 5 microphones；
II, it is directed to a certain frequency band, 5 microphones therein is filtered according to corresponding band bandwidth first, have filtered wave
After, different gains is given to different microphone channels, gain is determined by Hamming window, by from left to right sequence are as follows:
[0.0800,0.5400,1.0000,0.5400,0.0800] further enhances front directive property, finally to 5 microphones
Output be overlapped to be formed present band output；
III, step II is carried out to all frequency bands, finally the frequency band by all outputs is overlapped, as final defeated
Out.
A/d conversion device is to convert the output of broad-band EDFA circuit to digital signal, and dsp processor utilizes depth
Learning model carries out judgement of uttering long and high-pitched sounds, and according to situation of uttering long and high-pitched sounds, and is inhibited accordingly to input signal and is exported to DA converting means
It sets, DA conversion equipment converts digital signals into analog signal output to loudspeaker driving circuit.Loudspeaker driving circuit is by DA
Output acoustical signal is converted electrical signals to by loudspeaker after play out in space.
Through non-uniform Distribution and broad-band EDFA, under the conditions of equal length, it is possible to reduce microphone number, simultaneously
Sharp subband distribution, can obtain same directive property, i.e. broadband directive property effect is the same, while only utilizing in different frequency bands
Hardware simulation circuit, avoids Digital Signal Processing, needs multichannel AD decoder, reduce hardware cost.
The education sound reinforcement system of the present embodiment has the advantages that
(1) microphone array is used, feedback path gain can be reduced, reduces the probability for generation of uttering long and high-pitched sounds；
(2) non-uniform Distribution is used, microphone number can be reduced in the case where drawing diameter on an equal basis, reduce hardware cost；Simultaneously
Using Substrip analysis and non-uniform Distribution, the consistent effect of broadband directive property can achieve, and realized using analog circuit, further
Reduce hardware cost；
(3) arc microphone array is utilized, there is natural focusing, further enhance directive property.
The above embodiments are only for explaining the technical ideas and features of the present invention, is a kind of preferred embodiment, mesh
Be that person skilled in the art can understand the content of the utility model and implement accordingly, this reality can not be limited with this
With novel protection scope.Equivalent transformation or modification made by all Spirit Essences according to the present utility model should all be covered at this
Within the protection scope of utility model.
Claims (9)
1. a kind of education sound reinforcement system, it is characterised in that: including microphone array, the microphone driving electricity being successively electrically connected
Road, broad-band EDFA circuit, a/d conversion device, dsp processor, DA conversion equipment, loudspeaker driving circuit and loudspeaker, institute
Stating microphone array includes multiple microphones, and the multiple microphone is alternatively arranged along an arc, and the microphone array is symmetrical
Setting, in addition to the microphone for being located at arc middle position, any microphone is adjacent to the adjacent wheat of arc middle position side
Arc length d1 between gram wind is less than the arc length d2 between its neighboring microphones far from arc middle position side.
2. education sound reinforcement system according to claim 1, it is characterised in that: arc length d2 is twice of arc length d1.
3. education sound reinforcement system according to claim 1, it is characterised in that: the multiple microphone is divided into multiple groups, often
The corresponding frequency band of group microphone, the broad-band EDFA circuit includes multiple groups microphone channel, multiple first add circuits
And second add circuit, each microphone channel respectively include mutually concatenate bandwidth-limited circuit and a gain
Circuit, each bandwidth-limited circuit are accordingly connected with a microphone respectively, the corresponding frequency band of microphone channel described in every group
And be made of multiple microphone channels of the corresponding frequency band, each first add circuit is logical with corresponding one group of microphone respectively
The gain circuitry connection in road is overlapped to form present band output with the output to each microphone in identical frequency band, and described the
Two add circuits are connect to export superposition to all frequency bands and form total output with the multiple first add circuit.
4. education sound reinforcement system according to claim 3, it is characterised in that: the bandwidth-limited circuit includes one first
Capacitor, second capacitor, a first resistor, a 3rd resistor and an operational amplifier；The first resistor connection
The input terminal of bandwidth-limited circuit；Second capacitance connection is in the anti-phase input of the first resistor and the operational amplifier
Between end；One end of the first capacitor is connected between the first resistor and second capacitor, and the other end is connected to institute
State the output end of operational amplifier；One end of the 3rd resistor is connected to the anti-of second capacitor and the operational amplifier
Between phase input terminal, the other end is connected to the output end of the operational amplifier.
5. education sound reinforcement system according to claim 4, it is characterised in that: the bandwidth-limited circuit further includes one
Two resistance；One end of the second resistance is connected between the first resistor and the second capacitor, other end ground connection；The operation
The non-inverting input terminal of amplifier is grounded.
6. education sound reinforcement system according to claim 3, it is characterised in that: the gain circuitry includes the 4th resistance
With an operational amplifier, the input terminal of the 4th resistance connection gain circuitry, the reverse input end of the operational amplifier
Connect the 4th resistance, the non-inverting input terminal ground connection of the operational amplifier.
7. education sound reinforcement system according to claim 6, it is characterised in that: the gain circuitry further include be parallel to it is described
The 5th resistance between the inverting input terminal and output end of operational amplifier.
8. education sound reinforcement system according to claim 3, it is characterised in that: first add circuit has multiple inputs
End, first add circuit includes multiple resistance and an operational amplifier, wherein each input terminal and a resistance concatenation
It is connected to the inverting input terminal of operational amplifier afterwards, first add circuit further includes be parallel to the operational amplifier anti-
Resistance between phase input terminal and output end, the non-inverting input terminal ground connection of the operational amplifier.
9. education sound reinforcement system according to claim 3, it is characterised in that: second add circuit has multiple inputs
End, second add circuit includes multiple resistance and an operational amplifier, wherein each input terminal and a resistance concatenation
It is connected to the inverting input terminal of operational amplifier afterwards, second add circuit further includes be parallel to the operational amplifier anti-
Resistance between phase input terminal and output end, the non-inverting input terminal ground connection of the operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920982128.0U CN209710319U (en) | 2019-06-27 | 2019-06-27 | A kind of education sound reinforcement system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920982128.0U CN209710319U (en) | 2019-06-27 | 2019-06-27 | A kind of education sound reinforcement system |
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| Publication Number | Publication Date |
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| CN209710319U true CN209710319U (en) | 2019-11-29 |
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ID=68650950
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| CN201920982128.0U Active CN209710319U (en) | 2019-06-27 | 2019-06-27 | A kind of education sound reinforcement system |
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| CN (1) | CN209710319U (en) |
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- 2019-06-27 CN CN201920982128.0U patent/CN209710319U/en active Active
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