CN206024114U - A kind of audio test system - Google Patents
A kind of audio test system Download PDFInfo
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- CN206024114U CN206024114U CN201620959742.1U CN201620959742U CN206024114U CN 206024114 U CN206024114 U CN 206024114U CN 201620959742 U CN201620959742 U CN 201620959742U CN 206024114 U CN206024114 U CN 206024114U
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Abstract
This utility model belongs to audio-frequency test field, there is provided a kind of audio test system.In the system, power amplification unit adopts battery feed circuit, shorten the length of the transmission line between power amplification unit and tested electroacoustic transducer, improve test accuracy, simultaneously, as the power supply signal that battery is provided is not present after interference signal, so as to the measurement error that power amplification unit is caused is eliminated because of power supply disturbance, further increase test accuracy.
Description
Technical field
This utility model belongs to audio-frequency test field, more particularly to a kind of audio test system.
Background technology
Audio test system is a kind of test for the analog/digital audio equipment such as test loudspeaker, amplifier, mobile phone
System.The audio test system that prior art is provided is as shown in figure 1, when audio-frequency test is carried out, audio analyzer produces test
Signal, test signal output after power amplification unit amplification arrive tested electroacoustic transducer, the tested electroacoustic conversion of microphone pickup
Acoustical signal is simultaneously input to audio analyzer by acoustical signal that device sends, audio analyzer using time-domain analyses, frequency-domain analysiss,
The analysis methods such as distortion analysis, by the audio frequency parameter of measurement acoustical signal (such as：The voltage of the acoustical signal, frequency, distortion etc.
Parameter), and then evaluate the performance of tested electroacoustic transducer.
But in prior art, due to being powered to power amplification unit using mains-supplied circuit, tested electroacoustic transducer quilt
It is placed on test indoor, and power amplification unit is placed on test outdoor, causes power amplification unit to be changed to tested electroacoustic
Transmission line between device is very long, and relative to low-impedance tested electroacoustic transducer, the impedance of transmission line is bigger than normal, the partial pressure of transmission line
Effect can affect test result, cause test result inaccurate.Simultaneously as there is more interference signal, interference letter in civil power
Number tested electroacoustic transducer can be transferred to through power amplification unit together with test signal, equally can affect test result, cause
Test result is inaccurate.
Utility model content
The purpose of this utility model embodiment is to provide a kind of audio test system, it is intended to solve prior art offer
In audio test system, due to powering to power amplification unit using mains-supplied circuit, cause that test result is inaccurate to ask
Topic.
This utility model embodiment is achieved in that a kind of audio test system, the audio test system include：
The audio analyzer of output test signal；
After the test signal that the audio analyzer is exported is amplified, export to the first work(of tested electroacoustic transducer
Rate amplifying unit, the input of first power amplification unit connect the audio analyzer, the first power amplification list
The outfan of unit connects the tested electroacoustic transducer；
The acoustical signal that the tested electroacoustic transducer sends, and the sound by pickup is picked up according to the test signal
Message number is input to the pick up of the audio analyzer, and the pick up connects the audio analyzer；
To the power supply circuits that the audio analyzer is powered, the power supply that the power supply circuits connect the audio analyzer is defeated
Enter end；
The battery feed circuit that is powered to first power amplification unit using battery, the electricity of the battery feed circuit
Source output terminal connects the power input of first power amplification unit.
In the audio test system that this utility model is provided, power amplification unit adopts battery feed circuit, shortens work(
The length of the transmission line between rate amplifying unit and tested electroacoustic transducer, improves test accuracy, simultaneously as battery is carried
For power supply signal do not exist after interference signal, miss so as to eliminate the measurement that power amplification unit causes because of power supply disturbance
Difference, further increases test accuracy.
Description of the drawings
Fig. 1 is the theory diagram of the audio test system that prior art is provided；
Fig. 2 is the theory diagram of the audio test system that this utility model embodiment one is provided；
Fig. 3 is that the first power amplification unit is adopted single amplifying circuit and realized using one kind during switching power amplifier
Mode schematic diagram；
Fig. 4 is that the first power amplification unit is using single amplifying circuit and real using another kind during switching power amplifier
Existing mode schematic diagram；
Fig. 5 is that the first power amplification unit adopts single amplifying circuit and using another reality during switching power amplifier
Existing mode schematic diagram；
Fig. 6 be the first power amplification unit adopt double amplification circuit when a kind of implementation schematic diagram；
Fig. 7 is that the first power amplification unit adopts double amplification circuit and using circuit diagram during AB power-like amplifiers；
Fig. 8 be the first power amplification unit adopt double amplification circuit when another kind of implementation schematic diagram；
Fig. 9 be the first power amplification unit adopt bridgt circuit when a kind of implementation schematic diagram；
Figure 10 is that the first power amplification unit adopts bridgt circuit and using circuit diagram during AB power-like amplifiers；
Figure 11 is that the first power amplification unit is adopted bridgt circuit and realized using one kind during switching power amplifier
Mode schematic diagram；
Figure 12 is that the first power amplification unit is using bridgt circuit and real using another kind during switching power amplifier
Existing mode schematic diagram；
Figure 13 is that the first power amplification unit adopts bridgt circuit and using another reality during switching power amplifier
Existing mode schematic diagram；
Figure 14 is the theory diagram of the audio test system that this utility model embodiment two is provided；
Figure 15 is the circuit diagram of battery feed circuit in this utility model embodiment two；
Figure 16 is the theory diagram of the audio test system that this utility model embodiment three is provided；
Figure 17 is a kind of circuit diagram of combined signal transmission circuit in this utility model embodiment three；
Figure 18 is another kind of circuit diagram of combined signal transmission circuit in this utility model embodiment three；
Figure 19 is the theory diagram of the audio test system that this utility model example IV is provided；
Figure 20 is the theory diagram of the audio test system that this utility model embodiment five is provided；
Figure 21 is the structure chart of pick up in this utility model embodiment five；
Figure 22 is the theory diagram of the audio test system that this utility model embodiment six is provided；
Figure 23 is the structure chart of the second power amplification unit in this utility model embodiment six；
Figure 24 is the circuit diagram of the second power amplification unit in this utility model embodiment six.
Specific embodiment
In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and enforcement
Example, is further elaborated to this utility model.It should be appreciated that specific embodiment described herein is only in order to explaining
This utility model, is not used to limit this utility model.
For the problem that prior art is present, in this utility model, power amplification unit adopts battery feed circuit, to contract
The length of the transmission line between short power amplification unit and tested electroacoustic transducer, improves test accuracy, and eliminates in civil power
Impact of the interference signal to test result.It is described in detail below with reference to embodiment：
Embodiment one
This utility model embodiment one provides a kind of audio test system, as shown in Fig. 2 including：Output test signal
Audio analyzer 1；After the test signal that audio analyzer 1 is exported is amplified, export to the first work(of tested electroacoustic transducer
Rate amplifying unit 2, the input connection audio analyzer 1 of the first power amplification unit 2, the output of the first power amplification unit 2
The tested electroacoustic transducer of end connection；Pick up the acoustical signal that tested electroacoustic transducer sends according to test signal, and by pickup
Acoustical signal is input to audio analyzer, is measured the pick up 3 of the audio frequency parameter of the acoustical signal, pick up by audio analyzer
3 connection audio analyzers 1；To the power supply circuits 4 of the power supply of audio analyzer 1, power supply circuits 4 connect the power supply of audio analyzer 1
Input；The battery feed circuit 5 that is powered to the first power amplification unit 2 using battery, the power supply output of battery feed circuit 5
The power input of the first power amplification unit 2 of end connection.
Wherein, the first power amplification unit 2 both can adopt single amplifying circuit, and double amplification circuit or many amplification electricity may also be employed
Road, and for the arbitrary amplifying circuit in single amplifying circuit or double/many amplifying circuits, can both adopt traditional B class power amplifications
Device or AB power-like amplifiers, may also be employed switching power amplifier.Preferably, using switching power amplifier, due to
Switching power amplifier efficiency high, therefore adopts switching mode amplifying circuit, battery working time lift 3 times or so.In addition,
The output impedance of switching power amplifier is little, so as to reduce test error, improves test accuracy.
As Fig. 3 shows the first power amplification unit 2 using single amplifying circuit and during using switching power amplifier
A kind of implementation principle, now, the first power amplification unit 2 specifically adopts D-type power amplifier, and audio analyzer 1 is defeated
The test signal for going out is analogue signal, and the first power amplification unit 2 may include：First pulse-width modulation circuit 201, for by audio frequency
The test signal of the output of analyser 1 is modulated into pulse width modulation (Pulse Width Modulation, PWM) signal defeated
Go out；First switch type power amplification circuit 202, for being amplified place by the pwm signal that the first pulse-width modulation circuit 201 is exported
Export after reason；First filter circuit 203, after being filtered to the signal that first switch type power amplification circuit 202 is exported,
Drive tested electroacoustic transducer sounding.
As Fig. 4 shows the first power amplification unit 2 using single amplifying circuit and during using switching power amplifier
Another kind of implementation principle, now, the first power amplification unit 2 is specifically amplified with digital power using A/D converter
The mode that device is combined, the test signal of the output of audio analyzer 1 is analogue signal, and the first power amplification unit 2 may include：First
Analog/digital conversion circuit 204, for carrying out analog/digital conversion to the test signal that audio analyzer 1 is exported, obtains digital signal simultaneously
Output；Second pulse-width modulation circuit 205, for being converted into PWM letters by the digital signal that the first analog/digital conversion circuit 204 is exported
Number and export；Second switch type power amplification circuit 206, for carrying out the pwm signal that the second pulse-width modulation circuit 205 is exported
Export after processing and amplifying；Second filter circuit 207, for carrying out to the signal that second switch type power amplification circuit 206 is exported
After filtering, tested electroacoustic transducer sounding is driven.
As Fig. 5 shows the first power amplification unit 2 using single amplifying circuit and during using switching power amplifier
Another implementation principle, now, the first power amplification unit 2 specifically adopts digital power amplifier, audio analyzer 1
The test signal of output is digital signal, and the first power amplification unit 2 may include：First digital signal receiving circuit 208, is used for
Receive the test signal of the output of audio analyzer 1；3rd pulse-width modulation circuit 209, for by the first digital signal receiving circuit
208 test signals for receiving are converted into pwm signal and export；3rd switching power amplifying circuit 210, for by the 3rd arteries and veins
The pwm signal of the output of wide modulation circuit 209 is exported after being amplified process；3rd filter circuit 211, for the 3rd switching mode
After the signal of the output of power amplification circuit 210 is filtered, tested electroacoustic transducer sounding is driven.
When the first power amplification unit 2 is using double amplification circuit or many amplifying circuits, under a kind of implementation, first
Power amplification unit 2 may include：The two or more power amplification electronic circuits being connected in parallel with each other, for respectively by audio analysis
After the test signal of the output of instrument 1 is amplified, export to tested electroacoustic transducer.
If Fig. 6 is so that the first power amplification unit 2 is using double amplification circuit as an example, the first power amplification unit 2 is shown
A kind of implementation principle.Now, the first power amplification unit 2 may include：The the first power amplification son electricity being connected in parallel with each other
Road 212 and the second power amplification electronic circuit 213, after amplifying for the test signal that exports audio analyzer 1 respectively, export to
Tested electroacoustic transducer.
Wherein, the first power amplification electronic circuit 212 and/or the second power amplification electronic circuit 213 can both adopt traditional B classes
Power amplifier or AB power-like amplifiers, may also be employed switching power amplifier, for example, as shown in Fig. 3, Fig. 4 or Fig. 5
Switching power amplifier.
When the first power amplification electronic circuit 212 and the second power amplification electronic circuit 213 are put using traditional AB class power
During big device, as shown in fig. 7, the first power amplification electronic circuit 212 may include：First integrated transporting discharging A1, first resistor R1 and second
Resistance R2.Wherein, the in-phase input end of the first integrated transporting discharging A1+connection audio analyzer 1, the first integrated transporting discharging A1's is anti-phase defeated
Enter to hold-isoelectric level end is connected by first resistor R1 and connects the outfan of the first integrated transporting discharging A1 by second resistance R2, the
The outfan of one integrated transporting discharging A1 is also connected with tested electroacoustic transducer.Second power amplification electronic circuit 213 may include：Second is integrated
Amplifier A2,3rd resistor R3 and the 4th resistance R4.Wherein, the first integrated fortune of in-phase input end+connection of the second integrated transporting discharging A2
Put the in-phase input end of A1+, the inverting input of the second integrated transporting discharging A2-by 3rd resistor R3 connects isoelectric level end and leads to
The outfan that the 4th resistance R4 connects the second integrated transporting discharging A2 is crossed, the outfan of the second integrated transporting discharging A2 is also connected with the first integrated fortune
Put the outfan of A1.
When the first power amplification unit 2 is using double amplification circuit or many amplifying circuits, under another kind of implementation, the
One power amplification unit 2 can be also further included on the basis of former implementation：Be connected on power amplification electronic circuit with
Resistance between the outfan of the first power amplification unit 2.
If Fig. 8 is so that the first power amplification unit 2 is using double amplification circuit as an example, the first power amplification unit 2 is shown
Another kind of implementation principle.Now, relative to Fig. 6, the first power amplification unit 2 can also be further included：It is connected on first
The 5th resistance R5 between the outfan of power amplification electronic circuit 212 and the first power amplification unit 2, and it is connected on the second work(
Rate amplifies the 6th resistance R6 between electronic circuit 213 and the outfan of the first power amplification unit 2.
Relative to Fig. 6, the first power amplification unit shown in Fig. 8 increased the 5th electricity of the little resistance as buffer resistance
Resistance R5 and the 6th resistance R6, the 5th resistance R5 and the 6th resistance R6 for example can select 0.1 ohm respectively, in order to buffer the first power
Amplify the circuit differences between electronic circuit 212 and the second power amplification electronic circuit 213.
For the tested electroacoustic transducer with high impedance, when one timing of measured power, need higher voltage expire
Foot test needs, for this purpose, the first power amplification unit can adopt bridgt circuit, the bridgt circuit to distinguish to tested electroacoustic transducer
Output positive test signal and anti-phase test signal, to obtain double output voltage.In addition, the first power for test
Amplifying unit, it is desirable to which its Frequency is responsive to below 20HZ even below 10HZ, to meet different tested electroacoustic transducers
Test needs, but the first power amplification unit of the unbridged circuit that is powered using single supply needs output capacitance come stopping direct current,
Output capacitance can affect the response of low frequency, and adopt the first power amplification unit of bridgt circuit then not need output capacitance, can
Meet the test needs of different tested electroacoustic transducers.
As Fig. 9 shows the first power amplification unit 2 using a kind of implementation principle during bridgt circuit, now, the
One power amplification unit can be wrapped using traditional B power-like amplifiers or AB power-like amplifiers, the first power amplification unit 2
Include：Positive amplifying circuit 214, after the test signal for exporting audio analyzer 1 is amplified, exports positive test signal to quilt
Survey electroacoustic transducer；See-saw circuit 215, after the test signal for exporting audio analyzer 1 is amplified, exports anti-phase survey
Trial signal gives tested electroacoustic transducer.
Specifically, as shown in Figure 10, see-saw circuit 215 may include：3rd integrated transporting discharging A3, the 7th resistance R7 and
The in-phase input end of eight resistance R8, the 3rd integrated transporting discharging A3+connection isoelectric level end, the inverting input of the 3rd integrated transporting discharging A3-
Audio analyzer 1 is connected by the 7th resistance R7 and connects the outfan of the 3rd integrated transporting discharging A3 by the 8th resistance R8, the 3rd
The outfan of integrated transporting discharging A3 connects tested electroacoustic transducer.Positive amplifying circuit 214 may include：4th integrated transporting discharging A4,
The 7th resistance of in-phase input end+connection of nine resistance R9 and the tenth resistance R10, the 4th integrated transporting discharging A4 be R7's and audio analyzer
One end of 1 connection, the inverting input of the 4th integrated transporting discharging A4-by the 9th resistance R9 connect isoelectric level end and pass through the tenth
Resistance R10 connects the outfan of the 4th integrated transporting discharging A4, and the outfan of the 4th integrated transporting discharging A4 connects tested electroacoustic transducer.
As Figure 11 shows the first power amplification unit 2 using bridgt circuit and using a during switching power amplifier
Implementation principle is planted, now, the first power amplification unit 2 specifically adopts D-type power amplifier, audio analyzer 1 to export
Test signal be analogue signal, the first power amplification unit 2 may include：4th pulse-width modulation circuit 216, for dividing audio frequency
The test signal of the output of analyzer 1 is modulated into positive pwm signal and anti-phase pwm signal and exports；4th switching power amplifies electricity
Road 217, exports for the positive pwm signal that the 4th pulse-width modulation circuit 216 is exported is amplified after process；5th switching mode
Power amplification circuit 218, exports for the anti-phase pwm signal that the 4th pulse-width modulation circuit 216 is exported is amplified after process；
4th filter circuit 219, after being filtered to the signal that the 4th switching power amplifying circuit 217 is exported, drives tested
Electroacoustic transducer sounding；5th filter circuit 220, for carrying out to the signal that the 5th switching power amplifying circuit 218 is exported
After filtering, tested electroacoustic transducer sounding is driven.
As Figure 12 shows the first power amplification unit 2 using bridgt circuit and using another during switching power amplifier
A kind of implementation principle, now, the first power amplification unit 2 is specifically using A/D converter and digital power amplifier
In conjunction with mode, the test signal of the output of audio analyzer 1 is analogue signal, and the first power amplification unit 2 may include：Second
Analog/digital conversion circuit 221, for carrying out analog/digital conversion to the test signal that audio analyzer 1 is exported, obtains digital signal simultaneously
Output；5th pulse-width modulation circuit 222, for being converted into positive by the digital signal that the second analog/digital conversion circuit 221 is exported
Pwm signal and anti-phase pwm signal are simultaneously exported；6th switching power amplifying circuit 223, for by the 5th pulse-width modulation circuit
The positive pwm signal of 222 outputs is exported after being amplified process；7th switching power amplifying circuit 224, for by five pulse conditions of ZANG-organs
The anti-phase pwm signal of the output of wide modulation circuit 222 is exported after being amplified process；6th filter circuit 225, for opening to the 6th
After the signal of 223 output of pass type power amplification circuit is filtered, tested electroacoustic transducer sounding is driven；7th filter circuit
226, after being filtered to the signal that the 7th switching power amplifying circuit 224 is exported, drive tested electroacoustic transducer to send out
Sound.
As Figure 13 show the first power amplification unit 2 using bridgt circuit and using during switching power amplifier again
A kind of implementation principle, now, the first power amplification unit 2 specifically adopts digital power amplifier, and audio analyzer 1 is defeated
The test signal for going out is digital signal, and the first power amplification unit 2 may include：Second digital signal receiving circuit 227, for connecing
Receive the test signal of the output of audio analyzer 1；6th pulse-width modulation circuit 228, for by the second digital signal receiving circuit 227
The test signal for receiving is converted into positive pwm signal and anti-phase pwm signal and exports；8th switching power amplifying circuit
229, export for the positive pwm signal that the 6th pulse-width modulation circuit 228 is exported is amplified after process；9th switching mode work(
Rate amplifying circuit 230, exports for the anti-phase pwm signal that the 6th pulse-width modulation circuit 228 is exported is amplified after process；The
Eight filter circuits 231, after being filtered to the signal that the 8th switching power amplifying circuit 229 is exported, drive tested electricity
Acoustical convertor sounding；9th filter circuit 232, for filtering to the signal that the 9th switching power amplifying circuit 230 is exported
After ripple, tested electroacoustic transducer sounding is driven.
Embodiment two
This utility model embodiment two provides a kind of audio test system, as shown in figure 14.Different from embodiment one,
In embodiment two, battery feed circuit 5 adopts rechargeable battery, meanwhile, in order to ensure the first power amplification unit 2 can be long-term
Continuous firing, audio analyzer 1 are additionally operable to provide charge power supply signal to battery feed circuit 5.
Specifically, as shown in figure 15, battery feed circuit 5 now may include：Rechargeable battery BT, charging chip U1, send out
Optical diode D1, the 11st resistance R11, the 17th resistance R17.Wherein, the power pins of charging chip U1 are powered as battery
The power input of circuit 5 connects the power output end of audio analyzer 1, the anode connection charging chip U1 of light emitting diode D1
Power pins, the negative electrode of light emitting diode D1 connected the state instruction pin of charging chip U1, filled by the 17th resistance R17
The charging current adjustment pin of electrical chip U1 connects isoelectric level end, the anode conduct of rechargeable battery BT by the 11st resistance R11
The charging output pin and the first power amplification unit 2 of the power output end connection charging chip U1 of battery feed circuit 5
Power input, the negative electrode connection isoelectric level end of rechargeable battery BT.
Embodiment three
This utility model embodiment three provides a kind of audio test system, as shown in figure 16.Different from embodiment two,
In embodiment three, audio test system may also include：Combined signal transmission circuit 6, for using the transmission test of same holding wire
Signal and charge power supply signal.Now, audio analyzer 1 is to connect the first power amplification list by combined signal transmission circuit 6
Unit 2 and battery feed circuit 5.
In one case, as shown in figure 17, combined signal transmission circuit 6 may include：First electric capacity C1, the second electric capacity
C2 and the holding wire being connected between second end of the first electric capacity C1 and the first end of the second electric capacity C2.First electric capacity C1's
First end connects the first signal output part of audio analyzer 1, and second end of the second electric capacity C2 connects the first power amplification unit
2, the power output end of audio analyzer 1 connects second end of the first electric capacity C1, the power input connection of battery feed circuit 5
The first end of the second electric capacity C2.So, when audio analyzer 1 need transmit test signal when, charge closing power supply signal defeated
Go out, test signal is transferred on holding wire through the first electric capacity C1, the after test signal, is exported through the second electric capacity C2 after straight
One power amplification unit 2；When audio analyzer 1 needs to transmit charge power supply signal, the output of test signal is closed, charge electricity
Source signal is directly transferred to battery feed circuit 5 through holding wire.
In another case, as shown in figure 18, combined signal transmission circuit 6 can also be further included：It is connected to signal
One static contact of the switching switch K on line, switching switch K connects second end of the first electric capacity C1, switches switch K another
Static contact connects the power output end of audio analyzer 1, and the moving contact of switching switch K is connected on holding wire.So, just can lead to
The action for crossing switching switch K comes line switching signal transmission test signal or charge power supply signal.
Example IV
This utility model example IV provides a kind of audio test system, as shown in figure 19.Now, audio test system
May also include：First wireless transmitter 8 of connection audio analyzer 1, for sending test signal by the first wireless network；Even
The first wireless receiver 7 of the first power amplification unit 2 is connect, for test signal being received from the first wireless network and will be received
Test signal be sent to the first power amplification unit 2.
Relative to wired connection mode, this kind of radio connection can improve the convenience of test system.For example, the first work(
After rate amplifying unit 2, the first wireless receiver 7 are made of one with battery feed circuit 5, can very easily meet tested electroacoustic and turn
Parallel operation test request at an arbitrary position.Also, after application battery feed circuit 5, audio analyzer 1 and the first power amplification
Farther out, under remote wire transmission mode, test signal is easily disturbed for the distance between unit 2, so as to affect test knot
Really, therefore, after using radio connection, test signal can be avoided disturbed, so as to reduce test error, improves test accurate
Exactness.
Embodiment five
This utility model embodiment five provides a kind of audio test system, as shown in figure 20.Now, audio test system
May also include：Second wireless transmitter 9 of connection pick up 3, for sending the sound of the pickup of pick up 3 by second wireless network
Message number；Second wireless receiver 10 of connection audio analyzer 1, for receiving acoustical signal from second wireless network and will connect
The acoustical signal for receiving is sent to audio analyzer 1.
Relative to wired connection mode, this kind of radio connection can improve the convenience of test system.For example, pick up
3rd, after the second wireless transmitter 9 is made of one with battery feed circuit 5, tested electroacoustic transducer can very easily be met any
The test request of position.Also, due to distant between pick up 3 and audio analyzer 1, remote wire transmission mode
Under, acoustical signal is easily disturbed, so as to affect test result, therefore, after using radio connection, sound can be avoided to believe
Number disturbed, so as to reduce test error, improve test accuracy.Certainly, in practice, can be by example IV and embodiment five
In conjunction with simplified system.
Further, as shown in figure 21, pick up 3 may include：Pickup circuit 31, sends out for picking up tested electroacoustic transducer
The acoustical signal for going out；Pickup amplifying circuit 32, exports for being amplified to the acoustical signal that pickup circuit 31 is picked up after process
Give the second wireless transmitter 9；Signal detection control circuit 33, for when the pickup of pickup circuit 31 is to acoustical signal, control the
Two wireless transmitters 9 are opened, and when pickup circuit 31 is not picked up acoustical signal in the given time, control second is wireless to be sent out
Emitter 9 is closed, with saves energy.
Embodiment six
This utility model embodiment six provides a kind of audio test system, as shown in figure 22.Now, audio analyzer 1
Can be used for output impedance test signal, audio test system may also include：Second power amplification unit 11, for surveying to impedance
After trial signal is amplified, tested horn module is driven, and after the running voltage to tested horn module is sampled and amplifies,
Feedback signal is converted into impedance to audio analyzer 1 by audio analyzer 1 by output feedback signal, to complete to tested loudspeaker
The frequency impedance test of module.
Further, audio analyzer 1 is can be additionally used under the different frequency between 20HZ to 20KHZ, respectively output resistance
Anti- test signal, after the second power amplification unit 11 is now additionally operable to be amplified impedance test signal, drives tested loudspeaker
Module, and after the running voltage to tested horn module is sampled and amplifies, output feedback signal to audio analyzer 1, by
Feedback signal is converted into impedance by audio analyzer 1, obtains frequency impedance curve, is hindered with completing the frequency to tested horn module
Anti- curve test.
When audio analyzer 1 has a signal output part, can put with the first power audio analyzer 1 is disconnected
After the connection of big unit 2, the second power amplification unit 11 is connected to the first signal output part, when audio analyzer 1 has two
During individual signal output part, the second power amplification unit 11 can be connected to defeated different from the secondary signal of the first signal output part
Go out end.
Further, as shown in figure 23, the second power amplification unit 11 may include：Power amplification circuit 111, for sound
After the impedance test signal of the output of frequency division analyzer 1 is amplified, tested horn module is driven；Sample circuit 112, for tested
The running voltage of horn module is sampled；Sampling amplification circuit 113, for the voltage letter obtained by the sampling of sample circuit 112
After number being amplified, output feedback signal is to audio analyzer 1.
Specifically, as shown in figure 24, power amplification circuit 111 may include：5th integrated transporting discharging A5, the 12nd resistance R12
With the 13rd resistance R13.First signal output part of the in-phase input end of the 5th integrated transporting discharging A5+connection audio analyzer 1 or
Secondary signal outfan, the inverting input of the 5th integrated transporting discharging A5-isoelectric level end is connected by the 12nd resistance R12, and lead to
The outfan that the 13rd resistance R13 connects the 5th integrated transporting discharging A5 is crossed, the outfan of the 5th integrated transporting discharging A5 connects tested loudspeaker
One end of module.
Sample circuit 112 may include that the 16th resistance R16, the first end of the 16th resistance R16 connect tested horn module
The other end, the second end connection isoelectric level end of the 16th resistance R16.
Sampling amplification circuit 113 may include：6th integrated transporting discharging A6, the 14th resistance R14 and the 15th resistance R15, the
The first end of the 16th resistance R16 of in-phase input end+connection of six integrated transporting discharging A6, the anti-phase input of the 6th integrated transporting discharging A6
End-isoelectric level end is connected by the 15th resistance R15, and connect the output of the 6th integrated transporting discharging A6 by the 14th resistance R14
End, the outfan of the 6th integrated transporting discharging A6 connect the signal input part of audio analyzer 1.
In sum, in the audio test system that this utility model is provided, power amplification unit adopts battery feed circuit,
The length of the transmission line between power amplification unit and tested electroacoustic transducer is shortened, test accuracy is improve, meanwhile, by
After the power supply signal that battery is provided does not have interference signal, so as to eliminate what power amplification unit was caused because of power supply disturbance
Measurement error, further increases test accuracy.Further, the first power amplification unit 2 can select switching power amplifier,
Using its high efficiency, battery working time is improved, and reduces test error, improve test accuracy.Further, battery is supplied
Circuit 5 adopts rechargeable battery, and provides it charge power supply signal by audio analyzer 1, it is ensured that the first power amplification
Unit 2 being capable of continuous firing for a long time.Further, combined signal transmission circuit 6 is can achieve to test signal and charge power supply signal
Joint transmission, so that simplify system wiring.Further, realizing test using the first wireless transmitter 8 and the first wireless receiver 7
Being wirelessly transferred for signal, improves the convenience of test system.Further, using the second wireless transmitter 9 and the second wireless receiving
Being wirelessly transferred for acoustical signal realized by device 10, improves the convenience of test system.Finally, by increasing by the second power amplification list
Unit 11, realizes that the testing impedance to tested electroacoustic transducer and frequency impedance curve are tested, enriches systemic-function.
Preferred embodiment of the present utility model is the foregoing is only, not in order to limit this utility model, all at this
Any modification, equivalent and improvement that is made within the spirit and principle of utility model etc., should be included in this utility model
Protection domain within.
Claims (10)
1. a kind of audio test system, it is characterised in that the audio test system includes：
The audio analyzer of output test signal；
After the test signal that the audio analyzer is exported is amplified, export and put to the first power of tested electroacoustic transducer
Big unit, the input of first power amplification unit connect the audio analyzer, first power amplification unit
Outfan connects the tested electroacoustic transducer；
The acoustical signal that the tested electroacoustic transducer sends, and the sound letter by pickup is picked up according to the test signal
The pick up of the audio analyzer number is input to, the pick up connects the audio analyzer；
To the power supply circuits that the audio analyzer is powered, the power supply circuits connect the power input of the audio analyzer
End；
The battery feed circuit that is powered to first power amplification unit using battery, the power supply of the battery feed circuit are defeated
Go out the power input of end connection first power amplification unit.
2. audio test system as claimed in claim 1, it is characterised in that first power amplification unit is using single amplification
Circuit and adopt switching power amplifier.
3. audio test system as claimed in claim 1 or 2, it is characterised in that first power amplification unit includes：
The two or more power amplification electronic circuits being connected in parallel with each other, for respectively by described in audio analyzer output
After test signal is amplified, export to the tested electroacoustic transducer；
The power amplification electronic circuit adopts B power-like amplifiers, AB power-like amplifiers or switching power amplifier.
4. audio test system as claimed in claim 3, it is characterised in that first power amplification unit is further wrapped
Include：The resistance being connected between the outfan of the power amplification electronic circuit and first power amplification unit.
5. audio test system as claimed in claim 1, it is characterised in that first power amplification unit is using bridge joint electricity
Road and adopt B power-like amplifiers, AB power-like amplifiers or switching power amplifier.
6. the audio test system as described in claim 1,2 or 5, it is characterised in that the battery feed circuit is using charging
Battery, the audio analyzer are additionally operable to provide charge power supply signal to the battery feed circuit.
7. the audio test system as described in claim 1,2 or 5, it is characterised in that the battery feed circuit is using charging
Battery, the audio analyzer are additionally operable to provide charge power supply signal, the audio test system to the battery feed circuit
Also include：
Combined signal transmission circuit, for transmitting the test signal and the charge power supply signal using same holding wire.
8. audio test system as claimed in claim 1, it is characterised in that the audio test system also includes：
Connect the first wireless transmitter of the audio analyzer, for the test signal being sent by the first wireless network；
Connect the first wireless receiver of first power amplification unit, for the survey being received from first wireless network
The test signal for receiving simultaneously is sent to first power amplification unit by trial signal.
9. the audio test system as described in claim 1,2,5 or 8, it is characterised in that the audio test system also includes：
Connect the second wireless transmitter of the pick up, for the institute of the microphone pickup is sent by second wireless network
State acoustical signal；
Connect the second wireless receiver of the audio analyzer, for the acoustical signal being received from the second wireless network
And the acoustical signal for receiving is sent to the audio analyzer.
10. the audio test system as described in claim 1,2,5 or 8, it is characterised in that the audio analyzer is additionally operable to defeated
Go out impedance test signal, the audio test system also includes：
Second power amplification unit, after being amplified to the impedance test signal, drives tested horn module, and to institute
State tested horn module running voltage be sampled and amplify after, output feedback signal give the audio analyzer, by described
The feedback signal is converted into impedance by audio analyzer, to complete the testing impedance to the tested horn module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620959742.1U CN206024114U (en) | 2016-08-26 | 2016-08-26 | A kind of audio test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620959742.1U CN206024114U (en) | 2016-08-26 | 2016-08-26 | A kind of audio test system |
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| Publication Number | Publication Date |
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| CN206024114U true CN206024114U (en) | 2017-03-15 |
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| CN201620959742.1U Expired - Fee Related CN206024114U (en) | 2016-08-26 | 2016-08-26 | A kind of audio test system |
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| CN (1) | CN206024114U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107786932A (en) * | 2016-08-26 | 2018-03-09 | 深圳市赛音电子有限公司 | A kind of audio test system |
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2016
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107786932A (en) * | 2016-08-26 | 2018-03-09 | 深圳市赛音电子有限公司 | A kind of audio test system |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170315 |