CN206575605U - A kind of linear impulsive response measuring device for audio system - Google Patents
A kind of linear impulsive response measuring device for audio system Download PDFInfo
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- CN206575605U CN206575605U CN201620968011.3U CN201620968011U CN206575605U CN 206575605 U CN206575605 U CN 206575605U CN 201620968011 U CN201620968011 U CN 201620968011U CN 206575605 U CN206575605 U CN 206575605U
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Abstract
The utility model discloses a kind of linear impulsive response measuring device for audio system, also can accurately it be measured in the case where audio system is in nonlinear state.It includes：Signal generator, the inverse signal for generating swept-frequency signal and the swept-frequency signal；Tested audio system drive module, the output end with the input for being connected to the signal generator output end and for connecting tested audio system；Tested audio system signal acquisition module, exports for gathering the acoustics of tested audio system and is converted to data signal；Pulse train generative circuit, its input connects the output end of the signal generator and the output end of the tested audio system tonequality acquisition module respectively；Delay selection circuit, its input connects the output end of the pulse train generative circuit；Signal processing circuit, its input connects the output end of the delay selection circuit, for showing that linear impulsive is responded according to the corresponding impulse response of linear processes distortion.
Description
Technical field
The present invention relates to audio system fields of measurement, more particularly to a kind of linear impulsive response measurement for audio system
Device.
Background technology
At present in electronic circuit, such as the sensor of power discharging device, loudspeaker etc, it is required for measuring its frequency sound
This parameter is answered, to assess the performance of its signal transacting, namely linear impulsive is responded in time domain, also referred to as transmits letter
Number.Impulse response describes loss of the audio system to each frequency signal amplitude in transmitting procedure, and different frequency letter
Delay number in transmitting procedure.Impulse response measurement is a relatively ripe problem, also has more instrument to provide
Solution.
The literal sense of impulse response is that the pulse signal of a Dirac function passes through system, and the output of system is to be
The impulse response of system.Therefore, most straightforward approach is exactly to encourage testee with a Dirac pulse signal, measuring system
Output response.But engineering is in practice, such function impulse signal is non-existent, so being simply present in theoretic side
Case.There is the method that researcher proposes false pulse signal later, such as in room impulse response measurement, pricked with shot or balloon
Broken sound is used as Dirac function pulse signal.But the energy of this signal is smaller, signal to noise ratio is not high, and with it is real
Dirac function still has many difference, so measurement is inaccurate.
But, current measuring instrument does not analyze the influence that harmonic distortion is responded to linear impulsive.Compare in distortion
In the case of serious, the linear impulsive response of audio system how is accurately obtained, it is more with practical value in engineer applied.With
Exemplified by the impulse response measurement of loudspeaker, when pumping signal amplitude is smaller, speaker system is in linear condition, tests
To response be exactly linear impulsive response.But now because system output signal amplitude is smaller, so noise is smaller, may
Some errors can be brought to measurement result.In order to improve signal to noise ratio, it is necessary to increase the amplitude of pumping signal.And in normal work
Speaker system, its working condition is often no longer on linear condition, and now, the nonlinear characteristic of audio system will be superimposed
Into the linear response of audio system, the linear impulsive response measurement to audio system brings influence.
The content of the invention
In view of the above-mentioned problems, the utility model provides a kind of linear impulsive response measuring device for audio system,
Audio system is under nonlinear state and also can accurately measured.
To reach above-mentioned purpose, the utility model use technical scheme for：
A kind of linear impulsive response measuring device for audio system, including
Signal generator, for generating the continuous of the initial frequency with setting, cut-off frequency and swept-frequency signal length
The inverse signal of logarithm swept-frequency signal and the swept-frequency signal；
Tested audio system drive module, with the input for being connected to the signal generator output end and for connecting
The output end of tested audio system, for driving tested audio system according to the swept-frequency signal of acquisition；
Tested audio system signal acquisition module, exports for gathering the acoustics of tested audio system and is converted to digital letter
Number；
Pulse train generative circuit, its input connects the output end and the tested audio of the signal generator respectively
The output end of system tonequality acquisition module, the pulse of each order harmonicses is included for the inverse signal according to acquisition and digital signal generation
Sequence；
Delay selection circuit, its input connects the output end of the pulse train generative circuit, for intercept it is linear and
The corresponding pulse train of non-linear distortion；
Signal processing circuit, its input connects the output end of the delay selection circuit, for according to linear and non-thread
Property the corresponding impulse response of distortion draw linear impulsive respond.
Preferably, the tested audio system drive module includes：
Digital analog converter 1, its input connects the signal generator swept-frequency signal is converted into analog signal；
Power amplifier, its input connects the output end of the digital analog converter；
Analog signal output mouthful 1, the input of output end and tested audio system for connecting the power amplifier.
Preferably, the tested audio system signal acquisition module includes：
Sensor, exports for gathering the acoustics of tested audio system and is converted into electric signal；
Current amplifier, the output end that its input connects the sensor is amplified with the electric signal to acquisition；
Analog-digital converter, its input connects the output end of the current amplifier to be changed into the electric signal
Data signal.
Preferably, the pulse train generative circuit includes：
Two FFT circuits, two FFT circuits connect the signal generator by input port respectively
The output end of 1 output end and the tested audio system tonequality acquisition module；
Multiplier, its input connects the output end of two FFT circuits；
IFFT translation circuits, its input connects the output end of the multiplier and electric with the delay selection is connected to
The output port on road.
Preferably, the delay selection circuit includes：
Input port, it is connected with the output end of the pulse train generative circuit；
N is to delay circuit, and each delay circuit of the multipair delay circuit connects the input port respectively, and n is just
Integer；
N subtracters of the n to delay circuit is corresponded to, and the input of each subtracter connects a pair of delays of correspondence respectively
Two output ends of circuit；
N output interface of the correspondence n subtracter, each output interface connects the input of corresponding subtracter.
Preferably, the signal processing circuit is DSP process chips.
Preferably, the linear impulsive response measuring device also includes：
Digital analog converter 2, its input connects the output end of the signal processing circuit to respond linear impulsive
Be converted to analog signal；
Analog signal output mouthfuls 2, for connecting the output end and ancillary equipment of the digital analog converter 2 with by institute
Analog signal is stated to feed ancillary equipment.
Preferably, the linear impulsive response measuring device also includes：
Parameter memory, its input connects the output end of the delay selection circuit, for storing the linear impulsive
Response；
Interface for digital communication, for connecting the output end and ancillary equipment of the parameter memory so that ancillary equipment is called
The linear impulsive response of the parameter memory storage.
It is highly preferred that the parameter memory is Flash memories.
Preferably, the linear impulsive response measuring device also includes：
Digital signal output end mouthful, for connecting the output end and peripheral circuit of the signal processing circuit with by linear arteries and veins
Punching response output is to peripheral circuit.
The utility model uses above scheme, passes through pulse train generative circuit and delay selection circuit, it is contemplated that audio
Impulse response under the influence of the non-linear distortion of system, that is, audio system linear condition, non-thread character is in system
Also can accurately it be measured under state.
Brief description of the drawings
Fig. 1 is the schematic diagram of linear impulsive response measuring device of the present utility model；
Fig. 2 is the schematic diagram of pulse train generative circuit of the present utility model；
Fig. 3 is the schematic diagram of delay selection circuit of the present utility model.
Embodiment
Preferred embodiment of the present utility model is described in detail below in conjunction with the accompanying drawings, so that advantage of the present utility model
It can be easier to be understood by the person skilled in the art with feature.
Referring to the drawings shown in 1, one kind is used for audio system（Such as, loudspeaker）Linear impulsive response measuring device, including
Signal generator, for generating the continuous of the initial frequency with setting, cut-off frequency and swept-frequency signal length
The inverse signal of logarithm swept-frequency signal and the swept-frequency signal；
Tested audio system drive module, with the input for being connected to the signal generator output end and for connecting
The output end of tested audio system, for driving tested audio system according to the swept-frequency signal of acquisition；
Tested audio system signal acquisition module, exports for gathering the acoustics of tested audio system and is converted to digital letter
Number；
Pulse train generative circuit, its input connects the output end and the tested audio of the signal generator respectively
The output end of system tonequality acquisition module, each order harmonicses are included for the inverse signal according to acquisition and digital signal generation（Including
Linear and high-order nonlinear harmonic wave）Pulse train；
Delay selection circuit, its input connects the output end of the pulse train generative circuit, for intercept it is linear and
The corresponding pulse train of non-linear distortion；
Signal processing circuit, its input connects the output end of the delay selection circuit, for according to linear and non-thread
Property the corresponding impulse response of distortion draw linear impulsive respond.
Specifically, signal generator, for generating initial frequency, cut-off frequency and swept-frequency signal length with setting
Continuous logarithmic swept-frequency signal responded with the distorted signals of bandwidth needed for ensureing to measure, digital analog converter of feeding；It is simultaneously raw
Into the inverse signal of the swept-frequency signal, pulse train of feeding generative circuit；Such as, the parameter of setting swept-frequency signal is：Frequency sweep starting frequency
Rate 22Hz, terminates frequency 20kHz, sample rate is 40kHz, and selection swept-frequency signal length is；
Tested audio system drive module includes：
Digital analog converter 1, its input connects the signal generator swept-frequency signal is converted into analog signal；
Power amplifier, its input connects the output end of the digital analog converter；
Analog signal output mouthful 1, the input of output end and tested audio system for connecting the power amplifier,
What is wherein transmitted is analog signal.
Tested audio system signal acquisition module includes：
Sensor, exports for gathering the acoustics of tested audio system and is converted into electric signal, in the present embodiment, passes
Sensor selects the audio sound microphones of model B＆K 4189, and frequency band is 16Hz-20kHz, and performance is stable, and frequency response curve is flat；
Current amplifier, its input connects the output end of the sensor to carry out constant current to the commission electric signal of acquisition
Amplification, improves the matching performance of sensor and late-class circuit；
Analog-digital converter, its input connects the output end of the current amplifier to be changed into the electric signal
Data signal.
Referring to shown in accompanying drawing 2, pulse train generative circuit includes：
Two FFT circuits, two FFT circuits connect the signal generator by input port respectively
1 output end is exported with obtaining the output end of inverse signal and the tested audio system tonequality acquisition module with obtaining correspondence acoustics
Data signal；
Multiplier, its input connects the output end of two FFT circuits, and multiplier is known in the state of the art
And it is general, referring to patent US5754459A etc.；
IFFT translation circuits, its input connects the output end of the multiplier and electric with the delay selection is connected to
The output port on road.
Wherein, fft circuit and IFFT are circuit known in the state of the art and general.Fft circuit is to believe discrete array
Number frequency domain is transformed from the time domain to, referring to patent CN201886472U, patent application CN103176949A etc.；IFFT circuits are by frequency
Domain array signal transforms to time domain, referring to patent CN201886472U, patent application CN103176949A etc..
Referring to shown in accompanying drawing 3, delay selection circuit includes：
Input port, it is connected with the output end of the pulse train generative circuit；
N is to delay circuit, and each delay circuit of the multipair delay circuit connects the input port respectively, and n is just
Integer and the exponent number for corresponding to harmonic distortion；
N subtracters of the n to delay circuit is corresponded to, and the input of each subtracter connects a pair of delays of correspondence respectively
Two output ends of circuit；
N output interface of the correspondence n subtracter, each output interface connects the input of corresponding subtracter.
Wherein, delay circuit is known in the state of the art and general, referring to patent US3287608A etc..
The influence of the high order non-linear distortion of signal processing circuit, the calculating of progress data signal, meter and system, in time domain
Solve the pure linear impulsive response for the high-order nonlinear distortion that has been eliminated, that is, the pulse sound under system linear state
Should.
Such as, linear impulsive response h expression formula is in the prior art：h=k1+3k3+5k5, wherein k1、k3、k5Correspond to respectively
The output of delay selection circuit the 1st, 3,5 output interfaces, represents fundamental frequency impulse response, 3 rank nonlinear harmonic distortion arteries and veins respectively
Punching is corresponding, 5 rank nonlinear harmonic distortion impulse responses.The influence of three times and five times non-linear distortions is only only accounted for, and is disappeared
Pure linear impulsive response is obtained except three times and five times nonlinear influences.This is enough to describe general consumer electronics
The harmonic distortion of device, because the general order with harmonic distortion of the amplitude of the harmonic distortion of ubiquitous system increases and increased.
Certainly, if necessary to the harmonic distortion of calculating higher order, it is only necessary to which the rule for deferring to above formula is expanded.
From above-mentioned expression formula, signal processing circuit is the ball bearing made being made up of multiple adders and multiplier, such as
Signal processing circuit can use the High Performance DSP process chip TMS320C6747 of TI companies, and the chip has powerful, fortune
Calculate speed fast, the features such as performance indications are high.
The linear impulsive response measuring device also includes：
Digital analog converter 2, its input connects the output end of the signal processing circuit to respond linear impulsive
Be converted to analog signal；
Analog signal output mouthfuls 2, for connecting the output end and ancillary equipment of the digital analog converter 2 with by institute
Analog signal is stated to feed ancillary equipment（Such as, printer or display device）；
Parameter memory, its input connects the output end of the delay selection circuit, for storing the linear impulsive
Parameter memory selects flash storage in response, the present embodiment；
Interface for digital communication, for connecting the output end and ancillary equipment of the parameter memory so that ancillary equipment is called
The linear impulsive response of the parameter memory storage, the agreement that ancillary equipment can be decided through consultation at any time is entered with Flash memories
Row communication, and the linear impulsive response sequence stored in Flash memories is called, as subsequent treatment；But ancillary equipment
Only limit reads data in Flash memories, without the authority write；
Digital signal output end mouthful, output end and peripheral circuit for connecting the signal processing circuit（Such as, at audio
Manage circuit）So that linear impulsive response is exported to peripheral circuit.
Above-described embodiment is only a kind of preferred embodiment, its mesh to illustrate technical concepts and features of the present utility model
Be that person skilled in the art can understand content of the present utility model and implement according to this, this reality can not be limited with this
With new protection domain.All equivalent transformations made according to Spirit Essence of the present utility model or modification, should all cover at this
Within the protection domain of utility model.
Claims (9)
1. a kind of linear impulsive response measuring device for audio system, it is characterised in that including
Signal generator, for generating the initial frequency with setting, cut-off frequency and the continuous logarithmic of swept-frequency signal length
The inverse signal of swept-frequency signal and the swept-frequency signal；
Tested audio system drive module, with the input that is connected to the signal generator output end and tested for connecting
The output end of audio system, for driving tested audio system according to the swept-frequency signal of acquisition；
Tested audio system signal acquisition module, exports for gathering the acoustics of tested audio system and is converted to data signal；
Pulse train generative circuit, its input connects the output end and the tested audio system of the signal generator respectively
The output end of tonequality acquisition module, the pulse sequence of each order harmonicses is included for the inverse signal according to acquisition and digital signal generation
Row；
Delay selection circuit, its input connects the output end of the pulse train generative circuit, for intercepting linear and non-thread
The property corresponding pulse train of distortion；
Signal processing circuit, its input connects the output end of the delay selection circuit, for being lost according to linear processes
Very corresponding impulse response show that linear impulsive is responded；
Wherein, the tested audio system signal acquisition module includes：
Sensor, exports for gathering the acoustics of tested audio system and is converted into electric signal；
Current amplifier, the output end that its input connects the sensor is amplified with the electric signal to acquisition；
Analog-digital converter, its input connects the output end of the current amplifier electric signal is changed into numeral
Signal.
2. linear impulsive response measuring device according to claim 1, it is characterised in that the tested audio system driving
Module includes：
Digital analog converter 1, its input connects the signal generator swept-frequency signal is converted into analog signal；
Power amplifier, its input connects the output end of the digital analog converter；
Analog signal output mouthful 1, the input of output end and tested audio system for connecting the power amplifier.
3. linear impulsive response measuring device according to claim 1, it is characterised in that the pulse train generative circuit
Including：
Two FFT circuits, two FFT circuits connect the signal generator 1 by input port respectively
The output end of output end and the tested audio system tonequality acquisition module；
Multiplier, its input connects the output end of two FFT circuits；
IFFT translation circuits, its input, which connects the output end of the multiplier and had, is connected to the delay selection circuit
Output port.
4. linear impulsive response measuring device according to claim 1, it is characterised in that the delay selection circuit bag
Include：
Input port, it is connected with the output end of the pulse train generative circuit；
N is to delay circuit, and each delay circuit of the multipair delay circuit connects the input port respectively, and n is positive integer；
N subtracters of the n to delay circuit is corresponded to, and the input of each subtracter connects a pair of delay circuits of correspondence respectively
Two output ends；
N output interface of the correspondence n subtracter, each output interface connects the input of corresponding subtracter.
5. linear impulsive response measuring device according to claim 1, it is characterised in that the signal processing circuit is
DSP process chips.
6. linear impulsive response measuring device according to claim 1, it is characterised in that the linear impulsive response measurement is filled
Putting also includes：
Digital analog converter 2, its input connects the output end of the signal processing circuit and changed so that linear impulsive is responded
For analog signal；
Analog signal output mouthfuls 2, for connecting the output end and ancillary equipment of the digital analog converter 2 with by the mould
Intend signal to feed ancillary equipment.
7. linear impulsive response measuring device according to claim 1, it is characterised in that the linear impulsive response measurement is filled
Putting also includes：
Parameter memory, its input connects the output end of the delay selection circuit, for storing the linear impulsive response；
Interface for digital communication, for connect the parameter memory output end and ancillary equipment so that ancillary equipment call it is described
The linear impulsive response of parameter memory storage.
8. linear impulsive response measuring device according to claim 7, it is characterised in that the parameter memory is
Flash memories.
9. linear impulsive response measuring device according to claim 1, it is characterised in that the linear impulsive response measurement is filled
Putting also includes：
Digital signal output end mouthful, for connecting the output end and peripheral circuit of the signal processing circuit so that linear impulsive to be rung
It should export to peripheral circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620968011.3U CN206575605U (en) | 2016-08-29 | 2016-08-29 | A kind of linear impulsive response measuring device for audio system |
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| CN201620968011.3U CN206575605U (en) | 2016-08-29 | 2016-08-29 | A kind of linear impulsive response measuring device for audio system |
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| CN206575605U true CN206575605U (en) | 2017-10-20 |
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Address after: 215133 Suzhou City, Xiangcheng District province science and Technology Park and the road No. 333, No. Patentee after: Suzhou Sonavox electronic Limited by Share Ltd Address before: 215133 Suzhou City, Xiangcheng District province science and Technology Park and the road No. 333, No. Patentee before: Shangsheng Electronic Co., Ltd., Suzhou |
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