CN208723894U - Wireless audio integrated measurement system - Google Patents
Wireless audio integrated measurement system Download PDFInfo
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- CN208723894U CN208723894U CN201821742285.6U CN201821742285U CN208723894U CN 208723894 U CN208723894 U CN 208723894U CN 201821742285 U CN201821742285 U CN 201821742285U CN 208723894 U CN208723894 U CN 208723894U
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Abstract
The utility model discloses a kind of wireless audio integrated measurement system, including test equipment and determinand, the test equipment includes main control module, frequency hopping control module, signal source module, audio sending module, attenuation module, audio analysis module and radio module, and the main control module is electrically connected with frequency hopper module and audio analysis module respectively；The input terminal of the output end connection signal source module of the frequency hopper module, the output end of the signal source module and the input terminal of audio sending module are electrically connected, and the output end of the audio sending module connects attenuation module；The input terminal of the audio analysis module connects radio module.The utility model can be assembled in determinand and be finished, and the audio sound quality of determinand can be tested in the state of normal use, without designing special test connecting apparatus and test macro for determinand.
Description
Technical field
The utility model relates to the test systems that audio-frequency test field more particularly to a kind of pair of complete audio product are tested
System.
Background technique
Wireless audio device usually mutually transfers audio by two or more wireless transmitters, and wireless audio products matter
The quality of amount is often embodied on the emitted energy of wireless front end, and is received in the sensitivity of audio signal.Wherein, sound is received
The sensitivity of frequency signal refers to the audio signal receiving terminal of wireless audio device, in lower audio power for broad sense
In the case where, appoint the audio power referential data range that can so receive audio signal (for example, the wireless audio device
The minimum energy that can receive -80dBm)；For the range of narrow sense, wireless audio device under different audio powers,
There is a sensitivity number, it is usually to use percentage that representative, which is that the receiving end of wireless audio receives the ability of audio signal,
It indicates and (for example, under -80dBm, remains to 70% audio power and be received or 30% audio power is lost), usually
It is represented with bit error rate, packet loss or delivering power.The corresponding transmission success rate of energy will be received or fault rate is depicted as
One group of curve is then so-called sensitivity curve.
Usually that tests performance of front end and the sensitivity of audio is separately observed, this survey for traditional wireless audio devices
Method for testing may create the problem that
On the one hand, since under general work mode, traditional test equipment is difficult that wireless audio dress is objectively measured out
The receiving efficiency of receiving end is set, therefore, a special test pattern can be arranged in the digital receiver of traditional test equipment
Reach to send specific code, however, needing to design outside special test pattern at this test mode, it is also necessary to be connected to specific
Test fixture just can be carried out test, therefore, when traditional test equipment is tested, need to be surveyed when measured object is half cost
Examination, it is above various all to cause test inconvenient；
On the other hand, the part that traditional test equipment can test is only limitted to the autonomous working shape of measured object wireless front end
State is unable to test use state when product is integrally connected to kernel and agreement actual motion；Traditional test equipment is wirelessly to connect
The probability of dropout is received to judge the receiving sensitivity of the wireless front end of measured object, can only reflect measured object indirectly in this way
Operating status, and cannot judge that product wireless audio receives and dispatches effect, and can not judge audio sound quality；
It is only capable of obtaining the physical parameter of measured object front end relative to traditional examination equipment is surveyed, with measured object under more difference environment
It can remain to receive or issue enough clearly audio sensitivity of the sound quality more representative of measured object.It is preceding under the test environment
The Loss Rate or packet loss of the bit of end transmitting audio are not merely related to the energy that front end receiver arrives, and also transport with whole system
Row state is related, therefore, surveys sensitivity that traditional examination equipment is measured in test mode and not necessarily coincide measured object user
Actual experience.
Therefore, the prior art is defective, needs to improve.
Utility model content
The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind of wireless audio integrated measurement system and
Method.
The technical solution of the utility model is as follows:
Firstly, the utility model provides a kind of wireless audio integrated measurement system, including test equipment and determinand, institute
The audio signal of test equipment transmission can be received by stating determinand, and send audio signal to test equipment, which is characterized in that described
Test equipment includes main control module, frequency hopping control module, signal source module, audio sending module, attenuation module, audio analysis mould
Block and radio module；The main control module is electrically connected with frequency hopper module and audio analysis module respectively；The frequency hopper module
The input terminal of output end connection signal source module, the output end of the signal source module and the input terminal of audio sending module are electrical
The output end of connection, the audio sending module connects attenuation module；The input terminal of the audio analysis module connects radio reception mould
Block.
Further, the sampled audio signal that the determinand that the audio analysis module acquires radio module is sent, and
The sampled signal of acquisition carries out Fourier transform, acquires the signal-to-noise ratio (SNR) of the sampled signal, then acquire the neighbour of the sampled signal
Nearly average signal-to-noise ratio (SNRvg (t)).
Further, the test equipment further includes audio decoder module and energy detection module, the audio decoder mould
Block and audio analysis module are electrically connected, and energy detection module and audio decoder module are electrically connected.
Further, the test equipment further includes playback module, and the playback module electrically connects with audio sending module
It connects.
Using the above scheme, test macro provided by the utility model can be assembled in determinand and be finished, and can normal use
In the state of test the audio sound quality of determinand, without designing special test connecting apparatus and test macro for determinand；
The utility model receives the sensitivity of wireless audio signal in addition to that can test measured object, moreover it is possible to determinand when not decaying by signal
The audio signal of transmission obtains the basic sound quality of the determinand, increases the efficiency of disposable test process.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, the structure that can also be shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the work flow diagram of the utility model one embodiment sound intermediate frequency analysis module；
Fig. 3 is the sensitivity curve figure of the present embodiment.
The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
Referring to figs. 1 to shown in Fig. 3, since wireless digital voice stream carries out usually in the form of broadcast voice signal package
Transmission, for the sound fluency of implementation, therefore less design has retransmission mechanism, therefore dropped audio signal package.Lose sound
Believe that other audio sound quality losses such as staccato, distortion, sonic boom or even tone-off can occur when audio plays for signal package, it is traditional
The part that test equipment can test is only limitted to the autonomous working state of measured object wireless front end, is unable to test in product is integrally connected to
Use state when core and agreement actual motion.
To solve the above problems, the utility model provides a kind of in the case where measured object assembling finishes, testing audio spirit
The device and method of sensitivity, realize measured object own system run in the case where, measurement measured object transmitting-receiving energy situation with
And audio sound quality.
The utility model provides a kind of wireless audio integrated measurement system, including test equipment 100 and determinand 200,
The determinand 200 can receive the audio signal of the transmission of test equipment 100, and send audio signal to test equipment 100, described
Test equipment 100 includes main control module 101, frequency hopping control module 102, signal source module 103, audio sending module 104, decaying
Module 105, audio analysis module 106 and radio module 107；The main control module 101 respectively with frequency hopper module and audio analysis
Module 106 is electrically connected；The input terminal of the output end connection signal source module 103 of the frequency hopper module, the signal source module
103 output end and the input terminal of audio sending module 104 are electrically connected, the output end connection of the audio sending module 104
Attenuation module 105；The input terminal of the audio analysis module 106 connects radio module 107.
Wherein, measured object, which can be bluetooth headset etc., can receive wireless audio signal, and carry out physical audio broadcasting
Teller machines.The main control module 101 includes a control MCU.Frequency hopping control module 102 is used to trigger the signal of different frequency.
In the present embodiment, frequency hopping control module 102 can be a frequency hopping controller.Signal source module 103 is according to frequency hopping control module 102
The frequency of setting generates the audio signal of different frequency.In the present embodiment, signal source module 103 can generate dress for a signal
It sets, different audio signals can be exported.
The audio sending module is for generating wireless audio signal, and in the present embodiment, audio sending module 104 is using penetrating
Frequency sending device can convert radio frequency transmission from the mode of wireless transmission for audio signal.Attenuation module 105 is used for attenuation audio
The energy for the wireless signal that sending module 104 is sent.In the present embodiment, attenuation module 105 uses attenuator, for gradually reducing
The energy for the radiofrequency signal that radio frequency sending device is sent.Corresponding, measured object includes radio frequency reception end, is surveyed for receiving
The wireless audio that equipment 100 is sent is tried, an audio decoder is also connected with radio frequency reception end, for decoding radiofrequency signal.
Audio analyzer can be used in audio analysis module 106 in the present embodiment.The receipts being connect with audio analysis module 106
Sound module 107 is used to receive the physical audio of measured object transmission, and as one embodiment, the radio module 107 can use
The physical audio reception device of microphone etc.It is equipped with digital-to-analogue converter in the audio analysis module 106, is used for radio module
107 collected analog signals are converted into digital signal.
The audio analysis module 106 passes through the sound that digital-to-analogue converter sends the determinand 200 that radio module 107 acquires
Frequency signal sampling, and the sampled signal obtained carries out Fourier transform, acquires the signal-to-noise ratio (SNR) of the sampled signal, then acquire
The neighbouring average signal-to-noise ratio (SNRvg (t)) of the sampled signal.
The test equipment 100 further includes audio decoder module and energy detection module, the audio decoder module and sound
Frequency analysis module 106 is electrically connected, and energy detection module 109 and audio decoder module 108 are electrically connected, in the present embodiment, energy
Measuring detection module 109 includes a wireless audio energy measuring equipment, and the audio decoder module 108 is an audio decoder.With
This is corresponded to, and radio frequency sending device is equipped in determinand 200, for sending the wireless audio signal of determinand 200.The energy inspection
Survey the wireless audio energy that module 109 is used to detect determinand 200.
The test equipment 100 further includes playback module 110, and the playback module 110 and audio sending module 104 are electrical
Connection.In the present embodiment, the equipment such as loudspeaker are can be used in playback set.Main control module 101 carries out physics by playback module 110 and broadcasts
Sound.Corresponding, audio signal reception device, such as microphone etc. are provided in determinand 200.Test equipment 100, sending by be measured
The audio signal reception device of object 200 receives, and is sent to test equipment 100 by the radio frequency sending device of determinand 200, by test equipment
100 energy test module 109 receives.At the same time, determinand 200 carries out the decoded audio signal of audio decoding apparatus
Broadcast, so that the audio analysis module 106 of test equipment 100 analyzes the audio sound quality that determinand 200 broadcasts.Convenient for determinand
200 audio power test is synchronous with audio Acoustics Analysis to be carried out.
When test comprising the steps of:
Step 1, test equipment sends wireless audio signal to determinand, and gradually reduces the letter of the wireless audio transmitted by it
Number energy；Step 2, determinand receives the wireless audio signal that test equipment is sent, and is carried out according to the wireless audio signal
Broadcast；Step 3, test equipment receives broadcast and the Synchronization Analysis audio of determinand, show that determinand issues test equipment
Wireless audio signal Sensitirity va1ue；Step 4, step 1 is repeated to step 3, and test equipment obtains determinand to test equipment
The sensitivity curve of the wireless audio signal issued.
In the present embodiment, it is real that above-mentioned wireless audio integration test equipment can be used in wireless audio integrated test method for testing
It is existing.Specifically, test equipment main control module controls signal source module by frequency hopping control module and generates audio letter in step 1
Number, which is converted into radio frequency transmission from the mode of wireless transmission by wireless audio module, by audio signal.Decay mode
The energy for the wireless signal that block is sent for attenuation audio sending module.It, can be by test equipment in original state in the present embodiment
To send wireless audio signal to determinand in zero-decrement situation.
In step 3, test equipment obtains the Sensitirity va1ue for the wireless audio signal that determinand issues test equipment
Process the following steps are included:
Step 301, the broadcast of determinand is sampled, obtains sampled signal；Step 302, logical to above-mentioned sampled signal
It crosses window function W (t) and carries out windowing process, obtain signal wave in the expression formula of time-domain；Step 303, above-mentioned expression formula is carried out
Signal rows time domain is transformed into frequency domain by Fourier transform；Step 304, the Signal to Noise Ratio (SNR) (t) of above-mentioned sampled signal is calculated；Step
305, calculate the neighbouring average signal-to-noise ratio SNRavg (t) of above-mentioned sampled signal.
Wherein, the audio analysis module is believed by the audio that the determinand that digital-to-analogue converter acquires radio module is sent
Number sampling, convert digital signal for the collected analog signal of radio module.It is additionally provided with buffer storage in audio analysis module,
For caching above-mentioned digital signal.The digital signal of caching obtains signal wave by carrying out windowing process by window function W (t)
In the expression formula of time-domain.Fourier transform is carried out to above-mentioned expression formula, signal rows time domain is transformed into frequency domain.
It is noted that main control module triggers the signal of different frequency by frequency hopping controller, with this in the present embodiment
Meanwhile main control module sends the frequency of the Frequency Hopping Signal to be set out to analysis module.The analysis module is believed according to the frequency hopping
The energy value for number calculating the Frequency Hopping Signal wins frequency-domain expression according to the signal obtained after Fourier transform and acquires the audio received
The energy value of signal, and acquire according to above-mentioned two energy value the Signal to Noise Ratio (SNR) (t) of the sampled signal.
Wherein, audio analysis module intercepts same time interval several segments digital signal carries out windowing process, obtains
Several window functions: W (t), W (t-1) ... W (t-n) after above-mentioned window function is carried out Fourier transform respectively, then are acquired respectively
The corresponding signal-to-noise ratio of each adjacent time interval: SNR (t), SNR (t-1) ... SNR (t-n), letter corresponding to above-mentioned each adjacent time interval
It makes an uproar than averaging, the neighbouring average signal-to-noise ratio SNRvg (t) of the sampled signal can be acquired.
It repeats the above steps, using the energy for the wireless audio that test equipment is sent after overdamping as abscissa, is adopted with this
The neighbouring average signal-to-noise ratio SNRvg (t) of sample signal is ordinate, and test equipment obtains the nothing that determinand issues test equipment
The sensitivity curve of line audio signal.Judge whether neighbouring average signal-to-noise ratio SNRvg (t) reaches and can receive for sensitivity curve
Minimum sound quality, set Th for the corresponding sensitivity of the minimum sound quality, it is neighbouring flat when the sampled signal acquired
When equal Signal to Noise Ratio (SNR) vg (t) is lower than Th, audio analysis module stops sampling analysis.It can determine whether that this is tested according to sensitivity curve
The sensitivity of the received wireless audio signal of object.
The above is only the preferred embodiments of the present utility model only, is not intended to limit the utility model, all practical at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the guarantor of the utility model within novel spirit and principle
Within the scope of shield.
Claims (4)
1. a kind of wireless audio integrated measurement system, including test equipment and determinand, the determinand can receive test and set
The audio signal that preparation is sent, and audio signal is sent to test equipment, which is characterized in that the test equipment includes master control mould
Block, frequency hopping control module, signal source module, audio sending module, attenuation module, audio analysis module and radio module；It is described
Main control module is electrically connected with frequency hopper module and audio analysis module respectively；The output end connecting signal source mould of the frequency hopper module
The input terminal of block, the output end of the signal source module and the input terminal of audio sending module are electrically connected, and the audio is sent
The output end of module connects attenuation module；The input terminal of the audio analysis module connects radio module.
2. a kind of wireless audio integrated measurement system according to claim 1, which is characterized in that the audio analysis mould
The sampled audio signal that the determinand that block acquires radio module is sent, and the sampled signal obtained carries out Fourier transform, asks
The signal-to-noise ratio (SNR) of the sampled signal is obtained, then acquires the neighbouring average signal-to-noise ratio (SNRvg (t)) of the sampled signal.
3. a kind of wireless audio integrated measurement system according to claim 1, which is characterized in that the test equipment is also
Including audio decoder module and energy detection module, the audio decoder module and audio analysis module are electrically connected, energy inspection
It surveys module and audio decoder module is electrically connected.
4. a kind of wireless audio integrated measurement system according to claim 1, which is characterized in that the test equipment is also
Including playback module, the playback module and audio sending module are electrically connected.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109150238A (en) * | 2018-10-25 | 2019-01-04 | 深圳星禾设计有限公司 | Wireless audio integrated measurement system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109150238A (en) * | 2018-10-25 | 2019-01-04 | 深圳星禾设计有限公司 | Wireless audio integrated measurement system and method |
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