CN107231597A - The method of testing and system of harmonic distortion of loudspeaker value - Google Patents
The method of testing and system of harmonic distortion of loudspeaker value Download PDFInfo
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- CN107231597A CN107231597A CN201710376814.9A CN201710376814A CN107231597A CN 107231597 A CN107231597 A CN 107231597A CN 201710376814 A CN201710376814 A CN 201710376814A CN 107231597 A CN107231597 A CN 107231597A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
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Abstract
The present invention relates to loudspeaker detection technique field, more particularly to a kind of method of testing and system of harmonic distortion of loudspeaker value.The method of testing of harmonic distortion of loudspeaker value, comprises the following steps：To a loudspeaker to be measured input audio-frequency test signal, obtain multiple Frequency points and with the one-to-one multiple harmonic distortion values of multiple Frequency points；Sweep check signal is inputted to loudspeaker to be measured, obtain multiple Frequency points and with the one-to-one multiple frequency sweep higher limits of multiple Frequency points；Whether the corresponding frequency sweep higher limit of a Frequency point is judged more than a preset value, if so, then confirming that the corresponding harmonic distortion value of Frequency point is untrue.The method of testing and system for the harmonic distortion of loudspeaker value that the present invention is provided, improve the reliability of harmonic distortion of loudspeaker value test result, so as to more accurately reflect the performance condition of loudspeaker.
Description
Technical field
The present invention relates to loudspeaker detection technique field, more particularly to a kind of harmonic distortion of loudspeaker value method of testing and
System.
Background technology
This year, with the communication technology develop rapidly and people's living standard continuous improvement, mobile communication equipment
More and more it is available for consumer use.In order to meet a variety of demands of people, loudspeaker turns into mobile communication equipment
Necessary accessory.The loudspeaker species that can be applied to inside mobile communication equipment is a lot, although their working method is different, but most
All it is the air that surrounding is promoted by producing mechanical oscillation eventually, makes air dielectric produce fluctuation to realize turning for " electricity-power-sound "
Change.Due to reasons such as the structure of loudspeaker, material, techniques, loudspeaker is in actual use it is possible that various distortions
Situation.Wherein, a kind of most common distortion situation is harmonic distortion.So-called harmonic distortion, refers to when loudspeaker inputs a certain frequency
During the sinusoidal signal of rate, loudspeaker output acoustical signal in, in addition to input signal fundamental wave component, have also appeared second harmonic,
Triple-frequency harmonics etc..The appearance of harmonic distortion signal, can make people acoustically feel to be discord, think that comparison is ear-piercing, influence
The audio experience of people.Therefore, manufacturer, all can be to raising before loudspeaker is installed in order to ensure the quality of mobile communication equipment
The properties of sound device are tested.
At present, mainly using auspicious sound (Trustsystem) test sound signal system come to loudspeaker in mobile communication industry
Performance is tested.The principle being measured using the system to the harmonic distortion value of loudspeaker is：Pass through computer control
Control sound card sends audio-frequency test signal, and power amplifier receives the audio-frequency test signal that sound card is sent, to audio-frequency test signal
After being amplified, loudspeaker to be measured is transferred to, loudspeaker to be measured is received after audio-frequency test signal, by " electricity-power-sound "
Conversion exports an audio signal again；One microphone gathers the audio signal that the loudspeaker to be measured is sent, and sends to sound card；Sound
Card carries out analog/digital conversion to the audio signal, and simulated audio signal is converted into digital audio and video signals, and by after conversion
Digital audio and video signals are transmitted to the Research of Analysis System for Harmonic Distortion unit of computer；By Research of Analysis System for Harmonic Distortion unit analyzing and processing it
Afterwards, it is possible to obtain the harmonic distortion value of the loudspeaker to be measured.
But verified and found by long-term test, the harmonic distortion of loudspeaker value that auspicious several signal test systems are tested out
Judge to be constantly present larger difference with subjective audition.Accompanying drawing 1A is that the several signal test system tests of prior art China and Sweden are obtained
Total harmonic distortion value figure, accompanying drawing 1B is the true harmonic distortion value figure after loudspeaker to be measured is placed in mobile phone.It is in accompanying drawing 1B
Loudspeaker to be measured is installed in mobile phone afterwards, without the true harmonic distortion value figure that instrument processing is adjusted by any audio.Accompanying drawing
1st, the abscissa of accompanying drawing 2 is that frequency, ordinate are total harmonic distortion value.By observing accompanying drawing 1A, accompanying drawing 1B it can be found that
Part in Figure 1A in dotted line frame exists humorous in dotted line frame in larger difference, i.e. Figure 1A with the part in Figure 1B in dotted line frame
Wave distortion value is untrue.Due to there is false harmonic distortion value, the test result of auspicious several signal test systems cannot
Truly, accurately reflect the distortion value situation of loudspeaker to be measured, and then the performance of loudspeaker can not accurately be judged.
Therefore, how to judge the authenticity of harmonic distortion value in loudspeaker test system and test result, raised with accurately reflecting
The performance condition of sound device, is technical problem urgently to be resolved hurrily at present.
The content of the invention
The present invention provides a kind of method of testing and system of harmonic distortion of loudspeaker value, to solve in the prior art can not
The technical problem that authenticity to harmonic distortion value in loudspeaker test system and test result is distinguished, to improve test result
Reliability, so as to accurately reflect the performance condition of loudspeaker.
In order to solve the above problems, the invention provides a kind of method of testing of harmonic distortion of loudspeaker value, including it is as follows
Step：To a loudspeaker to be measured input audio-frequency test signal, obtain multiple Frequency points and with a pair of the multiple Frequency point 1
The multiple harmonic distortion values answered；To the loudspeaker to be measured input sweep check signal, obtain multiple Frequency points and with it is described
The one-to-one multiple frequency sweep higher limits of multiple Frequency points；Judge whether the corresponding frequency sweep higher limit of a Frequency point is default more than one
Value, if so, then confirming that the corresponding harmonic distortion value of the Frequency point is untrue.
It is preferred that, the sweep check signal is -40dB audio signal, and the preset value is -20dB.
It is preferred that, it is described that audio-frequency test signal is inputted to a loudspeaker to be measured, obtain multiple Frequency points and with it is described many
The specific steps of the one-to-one multiple harmonic distortion values of individual Frequency point include：One sound card, an audio-frequency test signal are provided；It is described
Audio-frequency test signal is exported after being changed through the sound card；The audio-frequency test signal exported from the sound card amplified is transmitted to institute
State loudspeaker to be measured；Receive the audio signal that loudspeaker to be measured is sent；The audio signal is analyzed and processed, one is obtained humorous
Wave distortion value test curve, the abscissa of the harmonic distortion value test curve is that frequency, ordinate are harmonic distortion value.
It is preferred that, it is described that sweep check signal is inputted to the loudspeaker to be measured, obtain multiple Frequency points and with it is described
The specific steps of the one-to-one multiple frequency sweep higher limits of multiple Frequency points include：One frequency sweep test signal is provided；The frequency sweep
Test signal is exported after being changed through sound card；To be measured raised from amplified transmit to described of sweep check signal that the sound card is exported
Sound device；Receive the swept-frequency signal that loudspeaker to be measured is sent；The swept-frequency signal is analyzed and processed, a frequency sweep curve is obtained,
The abscissa of the frequency sweep curve is that frequency, ordinate are frequency sweep higher limit.
It is preferred that, the method for testing of the harmonic distortion of loudspeaker value also comprises the following steps：Judge Frequency point correspondence
Frequency sweep higher limit whether more than a preset value, if so, then confirming that the corresponding harmonic distortion value of the Frequency point is untrue and right
One or several in the corresponding harmonic distortion value of the Frequency point, the Frequency point, the corresponding frequency sweep higher limit of the Frequency point
It is individual to be marked.
Present invention also offers a kind of test system of harmonic distortion of loudspeaker value, including：Test module, for being treated to one
Loudspeaker input audio-frequency test signal is surveyed, multiple Frequency points are obtained and one-to-one multiple humorous with the multiple Frequency point
Wave distortion value；Scan module, for inputting sweep check signal to the loudspeaker to be measured, obtains multiple Frequency points, Yi Jiyu
The one-to-one multiple frequency sweep higher limits of the multiple Frequency point；Control module, connects the test module, the frequency sweep mould
Block, for whether judging the corresponding frequency sweep higher limit of a Frequency point more than a preset value, if so, then confirming the Frequency point correspondence
Harmonic distortion value it is untrue.
It is preferred that, the sweep check signal is -40dB audio signal, and the preset value is -20dB.
It is preferred that, the test module includes sound card, power amplifier, microphone, processor；The sound card, connects institute
Power amplifier, the processor are stated, for being exported after being changed to an audio-frequency test signal to the power amplifier；Institute
State power amplifier, connect the loudspeaker to be measured, for will the audio-frequency test signal amplify after transmit to described and to be measured raise
Sound device；Microphone, connects the processor, receives the audio signal that the loudspeaker to be measured is sent, and transmit to the processing
Device；The processor, for being analyzed and processed to the audio signal, obtains a harmonic distortion value test curve, described humorous
The abscissa of wave distortion value test curve is that frequency, ordinate are harmonic distortion value.
It is preferred that, the scan module includes analyzer, and the analyzer connects the sound card；The sound card is to a frequency sweep
Test signal is exported after being changed to the power amplifier；After the power amplifier amplifies the sweep check signal
Transmit to the loudspeaker to be measured；The microphone receives the swept-frequency signal that the loudspeaker to be measured is sent, and transmits to described
Analyzer；The analyzer, for being analyzed and processed to the swept-frequency signal, obtains a frequency sweep curve, the frequency sweep curve
Abscissa be that frequency, ordinate are frequency sweep higher limit.
It is preferred that, the control module includes indexing unit；The indexing unit, for confirming the Frequency point correspondence
Harmonic distortion value it is untrue when, it is corresponding to the Frequency point, the corresponding harmonic distortion value of the Frequency point, the Frequency point
One or several in frequency sweep higher limit are marked.
The method of testing and system for the harmonic distortion of loudspeaker value that the present invention is provided, by entering to harmonic distortion value authenticity
Row judges, improves the reliability of harmonic distortion of loudspeaker value test result, so as to more accurately reflect the performance of loudspeaker
Situation.
Brief description of the drawings
Accompanying drawing 1A is the total harmonic distortion value figure that the several signal test system tests of prior art China and Sweden are obtained；
Accompanying drawing 1B is the true harmonic distortion value figure after loudspeaker to be measured is placed in mobile phone；
Accompanying drawing 2 is the method for testing flow chart of the harmonic distortion of loudspeaker value of the specific embodiment of the invention；
Accompanying drawing 3 is the test system structure schematic diagram of the harmonic distortion of loudspeaker value of the specific embodiment of the invention；
Accompanying drawing 4 is the test result figure of the harmonic distortion of loudspeaker value of the embodiment of the present invention 1.
Embodiment
The specific implementation of the method for testing and system of the harmonic distortion of loudspeaker value provided below in conjunction with the accompanying drawings the present invention
Mode elaborates.
Present embodiment provides a kind of method of testing of harmonic distortion of loudspeaker value, and accompanying drawing 2 is of the invention specific real
Apply the method for testing flow chart of the harmonic distortion of loudspeaker value of mode.As shown in Fig. 2 the loudspeaker harmonic wave of present embodiment
The method of testing of distortion value comprises the following steps：
Step S11, audio-frequency test signal is inputted to a loudspeaker to be measured, obtain multiple Frequency points and with multiple frequencies
The one-to-one multiple harmonic distortion values of point.Harmonic distortion value to loudspeaker is measured, and is evaluate speaker performance one
Individual important indicator.Harmonic distortion value in this embodiment, refers to total harmonic distortion value (Total of loudspeaker
Harmonic Distortion, THD).Wherein, audio-frequency test signal is preferably high-precision audio-frequency test sinusoidal signal.
In present embodiment, audio-frequency test signal is inputted to loudspeaker to be measured, to obtain multiple Frequency points, Yi Jiyu
The method of the one-to-one multiple harmonic distortion values of multiple Frequency points, those skilled in the art can be selected according to actual needs
Select, present embodiment is not construed as limiting to this.Due to the letter of auspicious sound (Trustsystem) test sound signal system's operating mode
The measure of harmonic distortion value that is single, being applicable to a variety of loudspeakers, therefore, in present embodiment is preferred to use auspicious several letters
Number test system is tested loudspeaker to be measured, with obtain loudspeaker to be measured multiple Frequency points and with multiple frequencies
The one-to-one multiple harmonic distortion values of point.
Step S12, to loudspeaker to be measured input sweep check signal, obtain multiple Frequency points and with multiple Frequency points
One-to-one multiple frequency sweep higher limits.So-called frequency sweep, refers in a default frequency range, frequency signal from high to low or by it is low to
The process of high consecutive variations.Sweep check signal is inputted to loudspeaker to be measured, just referred in a default frequency range, will from high to low
Or the frequency signal of consecutive variations is inputted to loudspeaker to be measured from low to high.After loudspeaker receiving frequency-sweeping test signal to be measured, warp
The conversion of " electricity-power-sound " is crossed, corresponding swept-frequency signal will be exported, swept-frequency signal is analyzed and processed, it is possible to obtain many
Individual Frequency point and with the one-to-one multiple frequency sweep higher limits of multiple Frequency points.In this embodiment, in order to humorous
The authenticity of all harmonic distortion values obtained in the test of wave distortion value is judged, it is preferred that default frequency range is not less than audio
The frequency range of test signal.Wherein, sweep check signal is preferably also high-precision sweep check sinusoidal signal.
Whether step S13, judge the corresponding frequency sweep higher limit of a Frequency point more than a preset value, if so, then confirming frequency
The corresponding harmonic distortion value of point is untrue.Because whether harmonic distortion value measurement result can be reliably directly affected to loudspeaker to be measured
The judgement of performance, and then influence the performance for installing the electronic equipment of loudspeaker to be measured, thus, tied to test harmonic distortion value
The authenticity of the corresponding harmonic distortion value of each Frequency point in fruit is distinguished that the method that present embodiment is used is：
Whether the corresponding frequency sweep higher limit of a Frequency point is judged more than a preset value, if, then it is assumed that the corresponding harmonic wave of the Frequency point loses
True value is false；If not, then it is assumed that the corresponding harmonic distortion value of the Frequency point is real.For the ease of comparing, in reality
In the application of border, harmonic distortion value and frequency sweep higher limit can be shown under the same coordinate system in the way of curve map, coordinate system
Transverse axis be frequency, the longitudinal axis of the left and right sides is respectively harmonic distortion value and frequency sweep higher limit.In this way, user can be with
Intuitively, the frequency range where false harmonic distortion value is quickly seen.
For prevent during frequency sweep because loudspeaker to be measured because sweep check signal is excessive and amplitude limit or obstruction, it is preferred that
Sweep check signal is -40dB audio signal, and preset value is -20dB.Those skilled in the art can enter according to actual needs
Row setting, present embodiment is not construed as limiting to this.
In order to simplify the determination step of harmonic distortion of loudspeaker value, expand the loudspeaker harmonic wave that present embodiment is provided
The application field of the method for testing of distortion value, it is preferred that audio-frequency test signal is inputted to a loudspeaker to be measured, multiple frequencies are obtained
Point and include with the specific steps of the one-to-one multiple harmonic distortion values of multiple Frequency points：A sound card, an audio is provided to survey
Trial signal；Audio-frequency test signal is exported after being changed through sound card；The audio-frequency test signal that exports from sound card is amplified to be transmitted to treating
Survey loudspeaker；Receive the audio signal that loudspeaker to be measured is sent；Audio signal is analyzed and processed, a harmonic distortion value is obtained
Test curve, the abscissa of the harmonic distortion value test curve is that frequency, ordinate are harmonic distortion value.Wherein, sound card bag
A D/A converter is included, for the digital signal transition that sends original audio source into analog signal；It can also be used to connect
The analog-signal transitions received are into data signal.In this embodiment, sound card not only can by audio-frequency test signal from
Data signal is converted into analog signal, and the audio signal that can also send the loudspeaker received is converted from analog into number
Word signal, is easy to subsequent analysis.
In this embodiment, in order to simplify testing procedure, it is preferred that to loudspeaker to be measured input sweep check letter
Number, obtain multiple Frequency points and include with the specific steps of the one-to-one multiple frequency sweep higher limits of multiple Frequency points：There is provided
One frequency sweep test signal；Sweep check signal is exported after being changed through sound card；The sweep check signal exported from sound card is amplified
Transmit to loudspeaker to be measured；Receive the swept-frequency signal that loudspeaker to be measured is sent；Swept-frequency signal is analyzed and processed, swept
Frequency curve, the abscissa of the frequency sweep curve is that frequency, ordinate are frequency sweep higher limit.I.e. in this embodiment, may be used
Sweep check is completed using the device of harmonic distortion of loudspeaker value is determined with direct, whole testing procedure is simplified, reduces
The complexity entirely tested.
Checked for the ease of user, it is preferred that the method for testing of harmonic distortion of loudspeaker value also comprises the following steps：Judge
Whether the corresponding frequency sweep higher limit of one Frequency point is more than a preset value, if so, then confirming the corresponding harmonic distortion value of Frequency point not
Truly, and to one in the Frequency point, the corresponding harmonic distortion value of the Frequency point, the corresponding frequency sweep higher limit of the Frequency point or
It is several to be marked.By mark, user can with the true implementations of the open-and-shut harmonic distortion value for knowing a certain frequency range,
It is simple and convenient.Wherein, mark mode can be will be corresponding with untrue harmonic distortion value on transverse axis using a pre-set color
Frequency range or Frequency point are marked, and either use a pre-set color to mark the corresponding harmonic distortion value of the Frequency point or with rectangular
The shapes such as shape, ellipse or a pre-set color mark the curve of untrue harmonic distortion value, or with rectangle, ellipse etc.
The frequency sweep curve of shape or a pre-set color by frequency sweep higher limit more than a preset value is marked.Those skilled in the art can basis
It is actually needed and is set, present embodiment is not construed as limiting to this.
The method of testing for the harmonic distortion of loudspeaker value that present embodiment is provided, by harmonic distortion value authenticity
Judged, improve the reliability of harmonic distortion of loudspeaker value test result, so as to more accurately reflect the property of loudspeaker
Can situation.
Present embodiment additionally provides a kind of test system of harmonic distortion of loudspeaker value, and accompanying drawing 3 is tool of the present invention
The test system structure schematic diagram of the harmonic distortion of loudspeaker value of body embodiment.As shown in figure 3, present embodiment is provided
Harmonic distortion of loudspeaker value test system, including：Test module 11, scan module 12 and control module 13.
Test module 11, for inputting audio-frequency test signal to a loudspeaker 14 to be measured, obtains multiple Frequency points, Yi Jiyu
The one-to-one multiple harmonic distortion values of multiple Frequency points.Harmonic distortion value to loudspeaker is measured, and is to evaluate loudspeaker
One important indicator of performance.Harmonic distortion value in this embodiment, refers to total harmonic distortion value of loudspeaker
(Total Harmonic Distortion, THD).Wherein, audio-frequency test signal is preferably high-precision sinusoidal audio test letter
Number.
In present embodiment, audio-frequency test signal is inputted to loudspeaker to be measured, to obtain multiple Frequency points, Yi Jiyu
The method of the one-to-one multiple harmonic distortion values of multiple Frequency points, those skilled in the art can be selected according to actual needs
Select, present embodiment is not construed as limiting to this.Due to the letter of auspicious sound (Trustsystem) test sound signal system's operating mode
The measure of harmonic distortion value that is single, being applicable to a variety of loudspeakers, therefore, in present embodiment is preferred to use auspicious several letters
Number test system is tested loudspeaker to be measured, with obtain loudspeaker to be measured multiple Frequency points and with multiple frequencies
The one-to-one multiple harmonic distortion values of point.
Scan module 12, for loudspeaker 14 to be measured input sweep check signal, obtain multiple Frequency points and with it is many
The one-to-one multiple frequency sweep higher limits of individual Frequency point.So-called frequency sweep, refers in a default frequency range, frequency signal is from high to low
Or the process of consecutive variations from low to high.Sweep check signal is inputted to loudspeaker to be measured, just referred in a default frequency range, will
The frequency signal of consecutive variations is inputted to loudspeaker to be measured from high to low or from low to high.Loudspeaker receiving frequency-sweeping test letter to be measured
After number, by the conversion of " electricity-power-sound ", corresponding swept-frequency signal will be exported, swept-frequency signal is analyzed and processed, so that it may
With obtain multiple Frequency points and with the one-to-one multiple frequency sweep higher limits of multiple Frequency points.In this embodiment,
In order to which the authenticity of all harmonic distortion values obtained in testing harmonic distortion value judges, it is preferred that default frequency range is not
Less than the frequency range of audio-frequency test signal.Wherein, sweep check signal is preferably high-precision sweep check sinusoidal signal.
Control module 13, connecting test module 11, scan module 12, for judging the corresponding frequency sweep higher limit of a Frequency point
Whether more than a preset value, if so, then confirming that the corresponding harmonic distortion value of Frequency point is untrue.Tied because harmonic distortion value is determined
Whether fruit can reliably directly affect the judgement to speaker performance to be measured, and then influence to install the electronic equipment of loudspeaker to be measured
Performance, thus, in order to be carried out to the authenticity of the corresponding harmonic distortion value of each Frequency point in harmonic distortion value test result
Distinguish, the control module 13 in the test system of the harmonic distortion of loudspeaker value of present embodiment judges Frequency point correspondence
Frequency sweep higher limit whether more than a preset value, if, then it is assumed that the corresponding harmonic distortion value of the Frequency point is false；If
It is no, then it is assumed that the corresponding harmonic distortion value of the Frequency point is real., in actual applications, can will be humorous for the ease of comparing
Wave distortion value is shown under the same coordinate system with frequency sweep higher limit in the way of curve map, and the transverse axis of coordinate system is frequency, left and right
The longitudinal axis of both sides is respectively harmonic distortion value and frequency sweep higher limit.In this way, user can intuitively, quickly see
Frequency range where false harmonic distortion value.
For prevent during frequency sweep because loudspeaker to be measured because sweep check signal is excessive and amplitude limit or obstruction, it is preferred that
Swept-frequency signal is -40dB audio signal, and preset value is -20dB.Those skilled in the art can be set according to actual needs
Fixed, present embodiment is not construed as limiting to this.
In order to simplify the determination step of harmonic distortion of loudspeaker value, expand the loudspeaker harmonic wave that present embodiment is provided
The application field of the method for testing of distortion value, it is preferred that test module 11 includes sound card 111, power amplifier 112, microphone
114th, processor 113；Sound card 111, connect power amplifier 112, for exported after being changed to an audio-frequency test signal to
Power amplifier 112；Power amplifier 112, connects loudspeaker 14 to be measured, for will audio-frequency test signal amplify after transmit to treating
Survey loudspeaker 14；Microphone 114, connects processor 113, receives the audio signal that loudspeaker hair 14 to be measured goes out, and transmit to place
Manage device 113；Processor 113, for being analyzed and processed to audio signal, obtains a harmonic distortion value test curve, described humorous
The abscissa of wave distortion value test curve is that frequency, ordinate are harmonic distortion value.Wherein, sound card 111 includes a D/A switch
Device, for the digital signal transition that sends original audio source into analog signal；It can also be used to believe the simulation received
Number it is transformed into data signal.In this embodiment, sound card not only can change audio-frequency test signal from data signal
Into analog signal, the audio signal that can also send the loudspeaker received is converted from analog into data signal, is easy to
Subsequent analysis.
In this embodiment, for the structure of the test system that simplifies harmonic distortion of loudspeaker value, it is preferred that sweep
Frequency module 12 includes analyzer 121；111 pair of one frequency sweep test signal of sound card is exported to power amplifier 112 after changing；Work(
Rate amplifier 112 is transmitted to loudspeaker 14 to be measured after sweep check signal is amplified；Microphone 114 receives loudspeaker 14 to be measured and sent out
The swept-frequency signal gone out, and transmit to analyzer 121；Analyzer 121, for being analyzed and processed to swept-frequency signal, is swept
Frequency curve, the abscissa of the frequency sweep curve is that frequency, ordinate are frequency sweep higher limit.I.e. in this embodiment, may be used
Surveyed with direct using the sound card 111, power amplifier 112, microphone 114 that determine harmonic distortion of loudspeaker value to complete frequency sweep
Examination, simplifies the structure of whole test system, reduces the complexity of whole test system.
Checked for the ease of user, it is preferred that control module 13 includes indexing unit 131；Indexing unit 131, for
When confirming that the corresponding harmonic distortion value of Frequency point is untrue, to the Frequency point, the corresponding harmonic distortion value of the Frequency point, the frequency
One or several in the corresponding frequency sweep higher limit of point are marked.By mark, user can know a certain with open-and-shut
The true implementations of the harmonic distortion value of frequency range, it is simple and convenient.Wherein, mark mode can be in transverse axis using a pre-set color
On frequency range corresponding with untrue harmonic distortion value or Frequency point are marked, or using a pre-set color by Frequency point correspondence
Harmonic distortion value mark, or with the shapes such as rectangle, ellipse or a pre-set color by the song of untrue harmonic distortion value
Line is marked, or with the shapes such as rectangle, ellipse or a pre-set color that frequency sweep higher limit is bent more than the frequency sweep of a preset value
Line is marked.Those skilled in the art can be set according to actual needs, and present embodiment is not construed as limiting to this.
The method of testing and system for the harmonic distortion of loudspeaker value that present embodiment is provided, by harmonic distortion value
Authenticity is judged, improves the reliability of harmonic distortion of loudspeaker value test result, so that more accurately reflection is raised one's voice
The performance condition of device.
Embodiment 1
Accompanying drawing 4 is the test result figure of the harmonic distortion of loudspeaker value of the embodiment of the present invention 1.The present embodiment is using the present invention
The test system of the harmonic distortion of loudspeaker value of offer is tested the harmonic distortion value of a loudspeaker.
In the present embodiment, the most frequently used dynamic loudspeaker is as loudspeaker to be measured using in existing mobile phone, with auspicious sound
(Trustsystem) test sound signal system is used as control module as test module using computer.Auspicious several signal testings
System includes sound card, power amplifier, microphone and processor.Wherein, the processor in test module can be installed on for one
Analyzer in harmonic distortion value processing software on computer, scan module can be installed on the frequency sweep point on computer for one
Analyse software.
When carrying out harmonic distortion value test process to loudspeaker to be measured, sound card input one of the computer into test module
High-precision sinusoidal audio test of digital signal；Sound card receives the audio-frequency test data signal, and by audio-frequency test data signal
Be converted to audio-frequency test analog signal, and by audio-frequency test analog signal transmission a to power amplifier；Power amplifier is by sound
Frequency test simulation signal is amplified processing, and by the audio-frequency test analog signal transmission of amplified processing to loudspeaker to be measured；
Loudspeaker to be measured is received after audio-frequency test analog signal, sends audio analog signals；Audio analog signals are raised one's voice positioned to be measured
Microphone in front of device is received；The audio analog signals received are transmitted back to sound card by microphone；Sound card again believes audio frequency simulation
Number audio digital signals are converted to, and the audio digital signals after conversion are transmitted to computer；Harmonic distortion in computer
Value processing software is analyzed and processed to audio digital signals, is obtained one by abscissa of frequency, harmonic distortion value is ordinate
Harmonic distortion value test curve, as shown in the curve A in Fig. 4.Harmonic distortion value in the present embodiment is loudspeaker to be measured
Total harmonic distortion value (Total Harmonic Distortion, THD)
In order to judge whether all harmonic distortion value points in Fig. 4 on curve A are true, also need to sweep loudspeaker to be measured
Frequency is tested.During sweep check is carried out, sound card of the computer into test module inputs a high-precision sine sweep
Test of digital signal；Sound card receives the sweep check data signal, and sweep check data signal is converted into sweep check mould
Intend signal, and by sweep check analog signal transmission a to power amplifier；Power amplifier enters sweep check analog signal
Row enhanced processing, and by the sweep check analog signal transmission of amplified processing to loudspeaker to be measured；Loudspeaker to be measured is received and swept
After frequency test simulation signal, frequency sweep analog signal is sent；Frequency sweep analog signal is connect by the microphone in front of loudspeaker to be measured
Receive；Microphone blocks the frequency sweep analog signal transmission echo received；Frequency sweep analog signal is converted to frequency sweep numeral by sound card again
Signal, and by the frequency sweep digital data transmission after conversion to computer；Frequency sweep analysis software in computer is believed frequency sweep numeral
Number analyzed and processed, obtain one by abscissa of frequency, frequency sweep higher limit for the frequency sweep curve of ordinate, the song in such as Fig. 4
Shown in line B.Wherein, sweep check data signal is -40dB audio signal.In the present embodiment, harmonic distortion value was tested
Journey and the public sound card of sweep check process, power amplifier and microphone.
For the ease of comparative analysis, in the present embodiment, harmonic distortion value test curve is shown in same seat with frequency sweep curve
Under mark system, the transverse axis of coordinate system is frequency, and the longitudinal axis of the left and right sides is respectively frequency sweep higher limit harmonic distortion value.The present embodiment
In preset value be -20dB, as shown in the straight line C in Fig. 4.Whether the institute on harmonic distortion value curve is judged is a little real
During, judge whether the corresponding frequency sweep higher limit of each Frequency point exceedes preset value one by one, if, then it is assumed that this Frequency point
Corresponding harmonic distortion value is untrue, and the frequency sweep curve more than preset value is marked with dotted line frame, to allow the mesh of user one
That is clear knows the false frequency range of harmonic distortion value or Frequency point.
It the above is only the preferred embodiment of the present invention, it is noted that for those skilled in the art,
Without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should be regarded as this hair
Bright protection domain.
Claims (10)
1. a kind of method of testing of harmonic distortion of loudspeaker value, it is characterised in that comprise the following steps：
To a loudspeaker to be measured input audio-frequency test signal, obtain multiple Frequency points and with a pair of the multiple Frequency point 1
The multiple harmonic distortion values answered；
To the loudspeaker to be measured input sweep check signal, obtain multiple Frequency points and with the multiple Frequency point one by one
Corresponding multiple frequency sweep higher limits；
Whether the corresponding frequency sweep higher limit of a Frequency point is judged more than a preset value, if so, then confirming that the Frequency point is corresponding
Harmonic distortion value is untrue.
2. the method for testing of harmonic distortion of loudspeaker value according to claim 1, it is characterised in that the sweep check letter
Number be -40dB audio signal, the preset value be -20dB.
3. the method for testing of harmonic distortion of loudspeaker value according to claim 1, it is characterised in that described to be measured to one to raise
Sound device inputs audio-frequency test signal, obtains multiple Frequency points and is lost with the one-to-one multiple harmonic waves of the multiple Frequency point
The specific steps of true value include：
One sound card, an audio-frequency test signal are provided；
The audio-frequency test signal is exported after being changed through the sound card；
The audio-frequency test signal exported from the sound card amplified is transmitted to the loudspeaker to be measured；
Receive the audio signal that loudspeaker to be measured is sent；
The audio signal is analyzed and processed, a harmonic distortion value test curve is obtained, the harmonic distortion value test is bent
The abscissa of line is that frequency, ordinate are harmonic distortion value.
4. the method for testing of harmonic distortion of loudspeaker value according to claim 3, it is characterised in that described to described to be measured
Loudspeaker inputs sweep check signal, obtain multiple Frequency points and with the one-to-one multiple frequency sweeps of the multiple Frequency point
The specific steps of higher limit include：
One frequency sweep test signal is provided；
The sweep check signal is exported after being changed through sound card；
The sweep check signal exported from the sound card amplified is transmitted to the loudspeaker to be measured；
Receive the swept-frequency signal that loudspeaker to be measured is sent；
The swept-frequency signal is analyzed and processed, a frequency sweep curve is obtained, the abscissa of the frequency sweep curve is frequency, indulges and sit
It is designated as frequency sweep higher limit.
5. the method for testing of harmonic distortion of loudspeaker value according to claim 1, it is characterised in that the loudspeaker harmonic wave
The method of testing of distortion value also comprises the following steps：
Whether the corresponding frequency sweep higher limit of a Frequency point is judged more than a preset value, if so, then confirming that the Frequency point is corresponding
Harmonic distortion value is untrue, and to the Frequency point, the corresponding harmonic distortion value of the Frequency point, the Frequency point is corresponding sweeps
One or several in frequency higher limit are marked.
6. a kind of test system of harmonic distortion of loudspeaker value, it is characterised in that including：
Test module, for inputting audio-frequency test signal to a loudspeaker to be measured, obtain multiple Frequency points and with it is the multiple
The one-to-one multiple harmonic distortion values of Frequency point；
Scan module, for inputting sweep check signal to the loudspeaker to be measured, obtain multiple Frequency points and with it is described many
The one-to-one multiple frequency sweep higher limits of individual Frequency point；
Control module, connects the test module, the scan module, for judging that the corresponding frequency sweep higher limit of a Frequency point is
It is no more than a preset value, if so, then confirming that the corresponding harmonic distortion value of the Frequency point is untrue.
7. the test system of harmonic distortion of loudspeaker value according to claim 6, it is characterised in that the sweep check letter
Number be -40dB audio signal, the preset value be -20dB.
8. the test system of harmonic distortion of loudspeaker value according to claim 6, it is characterised in that the test module bag
Include sound card, power amplifier, microphone, processor；The sound card, connects the power amplifier, the processor, for pair
One audio-frequency test signal is exported after being changed to the power amplifier；The power amplifier, connects described to be measured raise one's voice
Device, for being transmitted after the audio-frequency test signal is amplified to the loudspeaker to be measured；Microphone, connects the processor, connects
The audio signal that the loudspeaker to be measured is sent is received, and is transmitted to the processor；The processor, for believing the audio
Number analyzed and processed, obtain a harmonic distortion value test curve, the abscissa of the harmonic distortion value test curve is frequency,
Ordinate is harmonic distortion value.
9. the test system of harmonic distortion of loudspeaker value according to claim 8, it is characterised in that the scan module bag
Analyzer is included, the analyzer connects the sound card；The sound card is exported to described after being changed to a frequency sweep test signal
Power amplifier；The power amplifier is transmitted to the loudspeaker to be measured after the sweep check signal is amplified；The wheat
Gram wind receives the swept-frequency signal that the loudspeaker to be measured is sent, and transmits to the analyzer；The analyzer, for described
Swept-frequency signal is analyzed and processed, and obtains a frequency sweep curve, and the abscissa of the frequency sweep curve is that frequency, ordinate are in frequency sweep
Limit value.
10. the test system of harmonic distortion of loudspeaker value according to claim 6, it is characterised in that the control module
Including indexing unit；The indexing unit, for when confirming that the corresponding harmonic distortion value of the Frequency point is untrue, to described
In the corresponding harmonic distortion value of Frequency point, the Frequency point, the corresponding frequency sweep higher limit of the Frequency point it is one or several enter
Line flag.
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| CN116095579A (en) * | 2023-04-07 | 2023-05-09 | 张家港市玉同电子科技有限公司 | Harmonic wave processing method and system of ceramic loudspeaker |
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