CN204143874U - For the acoustical monitoring systems of audio-visual devices electromagnetic compatibility anti-interference test - Google Patents
For the acoustical monitoring systems of audio-visual devices electromagnetic compatibility anti-interference test Download PDFInfo
- Publication number
- CN204143874U CN204143874U CN201420495413.7U CN201420495413U CN204143874U CN 204143874 U CN204143874 U CN 204143874U CN 201420495413 U CN201420495413 U CN 201420495413U CN 204143874 U CN204143874 U CN 204143874U
- Authority
- CN
- China
- Prior art keywords
- data acquisition
- audio
- module
- processing module
- electromagnetic compatibility
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The utility model provides a kind of acoustical monitoring systems for audio-visual devices electromagnetic compatibility anti-interference test, comprises data acquisition unit and data analysis unit; Described data acquisition unit comprises again fictitious load, radio shielding cable and data acquisition equipment; Described fictitious load connects described data acquisition equipment through described radio shielding cable; Described data analysis unit comprises again processing module, display module and memory module; Described display module is all connected described processing module with described memory module; Communicate to connect between described data acquisition equipment and described processing module.Beneficial effect is: setting data collecting unit gathers the sound pressure signal that tested model machine exports, gathered sound pressure signal is received by data analysis unit, to go forward side by side row relax analysis, obtain the total harmonic distortion of sound, signal to noise ratio (S/N ratio), Signal-to-Noise-and-distortion ratio and total harmonic wave plus noise characteristic, to help Accurate Assessment Performance Level.Instead of the subjective assessment of test man, reduce personal error, also replace and use existing high cost audio analyzer.
Description
Technical field
The utility model relates to Audio Monitoring System, particularly a kind of acoustical monitoring systems for audio-visual devices electromagnetic compatibility anti-interference test.
Background technology
Along with the development of electronic information technology, the electrical system on vehicle becomes increasingly complex, integrated level is more and more higher, and accordingly, the electromagnetic compatibility characteristic requirements of user to the ebctronic reliability of vehicle, equipment room is more and more higher.
At present, the electromagnetic compatibility anti-interference test of vehicle carried video equipment, requires to carry out assessment of function to tested model machine.In order to the true car environment of simulating reality, usual audio-visual devices exports termination fictitious load and loudspeaker, during test with 1kHz 0dB signal for playing source of sound, monitor by test man the continued integrity that detected sample machine plays sound, carry out Performance Level A, B, C evaluate.Performance Level A, after testing apparatus applies interference, model machine is without any deviation.Performance Level B, testing apparatus, when applying interference, allows the reduction of performance, can automatically recover after interference removes.Performance Level C, testing apparatus, when applying interference, allows the forfeiture of function, can automatically recover after interference removes.Testing apparatus occur affect driver's normal driving interference, as then defective in uttered long and high-pitched sounds.This kind of Performance Level classification relies on the subjective feeling of test man completely, monitors for a long time and there is erroneous judgement and fail to judge; For sound interruption, test man is hard to tell as the of short duration song that changes still is interfered interruption.
Adopt audio analyzer to carry out auxiliary judgment to test prototype during existing minority depot test, but it exist expensive, the defect that monitoring cost is larger.
Utility model content
In order to solve above-mentioned existing technical matters, the utility model provides a kind of acoustical monitoring systems for audio-visual devices electromagnetic compatibility anti-interference test, its setting data collecting unit gathers the sound pressure signal that tested model machine exports, gathered sound pressure signal is received by data analysis unit, and analyze, obtain the total harmonic distortion of sound, signal to noise ratio (S/N ratio), Signal-to-Noise-and-distortion ratio and total harmonic wave plus noise characteristic, with Accurate Assessment Performance Level.
The utility model solves above-mentioned existing technical matters, provides a kind of acoustical monitoring systems for audio-visual devices electromagnetic compatibility anti-interference test, comprises data acquisition unit and data analysis unit; Described data acquisition unit comprises again fictitious load, radio shielding cable and data acquisition equipment; Described fictitious load connects described data acquisition equipment through described radio shielding cable; Described data analysis unit comprises again processing module, display module and memory module; Described display module is all connected described processing module with described memory module; Communicate to connect between described data acquisition equipment and described processing module.
The utility model further improves as described below.
Described fictitious load is power resistor.
Described data acquisition equipment is data collecting card.
Described data analysis unit comprises Threshold Alerts module; Described processing module connects described Threshold Alerts module.
Compared to prior art, the beneficial effects of the utility model are: setting data collecting unit gathers the sound pressure signal that tested model machine exports, gathered sound pressure signal is received by data analysis unit, and analyze, obtain the total harmonic distortion of sound, signal to noise ratio (S/N ratio), Signal-to-Noise-and-distortion ratio and total harmonic wave plus noise characteristic, to help Accurate Assessment Performance Level.Eliminate the subjective assessment of test man, reduce personal error, also replace and use existing high cost audio analyzer.
Accompanying drawing explanation
Fig. 1 is the acoustical monitoring systems module diagram that this is tested for the anti-interference of audio-visual devices electromagnetic compatibility.
| Data acquisition unit 11 | Fictitious load 111 |
| Radio shielding cable 112 | Data acquisition equipment 113 |
| Data analysis unit 12 | Processing module 121 |
| Display module 122 | Threshold Alerts module 123 |
| Memory module 124 |
Embodiment
To illustrate below in conjunction with accompanying drawing and embodiment further illustrates the utility model.
As shown in Figure 1, a kind of acoustical monitoring systems for audio-visual devices electromagnetic compatibility anti-interference test, comprises data acquisition unit and data analysis unit; Data acquisition unit comprises again fictitious load, radio shielding cable and data acquisition equipment; Fictitious load is through radio shielding cable connection data collecting device; Data analysis unit comprises again processing module, display module and memory module; Display module is connected with processing module respectively with memory module; Communicate to connect between data acquisition equipment and processing module.The principle of work of the utility model acoustical monitoring systems: the output terminal of tested model machine is connected with fictitious load, during electromagnetic compatibility anti-interference test, the output terminal Continuous Play 1kHz of tested model machine, the sine wave signal of 0dbm, fictitious load substitutes the load of actual use, the sound pressure signal that model machine is exported as far as possible accurately, there is comparatively strong-electromagnetic field in test environment, so adopt radio shielding cable to carry out transmitting this sound pressure signal to data acquisition equipment, after transfer to processing module, analyze, obtain the total harmonic distortion of collection signal, signal to noise ratio (S/N ratio), Signal-to-Noise-and-distortion ratio and total harmonic wave plus noise characteristic, stored by memory module, shown by display module, accurately to judge the Performance Level of tested model machine.The utility model setting data collecting unit gathers the sound pressure signal that tested model machine exports, gathered sound pressure signal is received by data analysis unit, and analyze, with Accurate Assessment Performance Level, eliminate the subjective assessment of test man, reduce personal error, replace and use existing high cost audio analyzer.
The utility model adopts fictitious load, and obtain sound pressure signal with alternative loudspeaker, this fictitious load is power resistor.In 24V system, adopt 8 Ω power resistors, in 12 V systems, adopt 4 Ω power resistors.
Data acquisition equipment of the present utility model is data collecting card.
The utility model data analysis unit comprises Threshold Alerts module; Processing module connect threshold alarm module, when occurring that distortion exceedes threshold value, by Threshold Alerts module automatic alarm.
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, some simple deduction or replace can also be made, all should be considered as belonging to protection domain of the present utility model.
Claims (4)
1., for an acoustical monitoring systems for audio-visual devices electromagnetic compatibility anti-interference test, it is characterized in that:
Comprise data acquisition unit and data analysis unit;
Described data acquisition unit comprises again fictitious load, radio shielding cable and data acquisition equipment; Described fictitious load connects described data acquisition equipment through described radio shielding cable;
Described data analysis unit comprises again processing module, display module and memory module; Described display module is all connected described processing module with described memory module;
Communicate to connect between described data acquisition equipment and described processing module.
2. the acoustical monitoring systems for audio-visual devices electromagnetic compatibility anti-interference test according to claim 1, is characterized in that: described fictitious load is power resistor.
3. the acoustical monitoring systems for audio-visual devices electromagnetic compatibility anti-interference test according to claim 1, is characterized in that: described data acquisition equipment is data collecting card.
4. the acoustical monitoring systems for audio-visual devices electromagnetic compatibility anti-interference test according to claim 1, is characterized in that: described data analysis unit comprises Threshold Alerts module; Described processing module connects described Threshold Alerts module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420495413.7U CN204143874U (en) | 2014-08-29 | 2014-08-29 | For the acoustical monitoring systems of audio-visual devices electromagnetic compatibility anti-interference test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420495413.7U CN204143874U (en) | 2014-08-29 | 2014-08-29 | For the acoustical monitoring systems of audio-visual devices electromagnetic compatibility anti-interference test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204143874U true CN204143874U (en) | 2015-02-04 |
Family
ID=52420543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420495413.7U Active CN204143874U (en) | 2014-08-29 | 2014-08-29 | For the acoustical monitoring systems of audio-visual devices electromagnetic compatibility anti-interference test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204143874U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108344914A (en) * | 2018-04-16 | 2018-07-31 | 中国汽车工程研究院股份有限公司 | The vehicle grade audio system electromagnetism interference test device and evaluation test method of user oriented experience |
-
2014
- 2014-08-29 CN CN201420495413.7U patent/CN204143874U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108344914A (en) * | 2018-04-16 | 2018-07-31 | 中国汽车工程研究院股份有限公司 | The vehicle grade audio system electromagnetism interference test device and evaluation test method of user oriented experience |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2021203714A1 (en) | Direct current charger detection system and method | |
| CN102547526B (en) | Real-time monitoring method and system of microphone working state | |
| CN106197650A (en) | A kind of method judging that audio signal is noiseless | |
| CN108445367A (en) | Portable partial discharge detector based on ultrasound | |
| CN104597373A (en) | Acoustic-magnetic synchronous cable fault fixed-point detector based on high-performance DSP | |
| WO2021203654A1 (en) | Audio test system and audio test method for electronic product | |
| CN204143874U (en) | For the acoustical monitoring systems of audio-visual devices electromagnetic compatibility anti-interference test | |
| CN104467996A (en) | Electromagnetic interference monitoring device | |
| CN104796840A (en) | Pickup device with self-checking function and self-checking method | |
| CN205278788U (en) | Pipeline appearance that leaks hunting | |
| CN104706366A (en) | Distraction testing method, device and system | |
| CN110099350A (en) | The test method of power amplifier | |
| CN111372180A (en) | Detection method and detection system of intelligent earphone | |
| CN103258544A (en) | Recording testing method, recording testing device, examination terminal and examination system | |
| CN103576579B (en) | Based on the brake signal harvester of CAN fieldbus, acquisition system and vehicle control system | |
| CN203259246U (en) | Car noise flexible testing system | |
| CN202818604U (en) | Audio frequency testing system applicable to conference system | |
| CN109238456A (en) | Train environment noise detecting method, apparatus and system | |
| CN206235390U (en) | A kind of hand-held vibration noise measuring instrument with writing function | |
| CN206226723U (en) | A kind of loudspeaker detection means | |
| CN205374622U (en) | Detection apparatus for buzzer | |
| CN205139289U (en) | Distribution test system of on -vehicle rack of 200T type row accuse | |
| CN203027487U (en) | Testing device of speaker output circuit | |
| CN204359892U (en) | Based on the sound magnetic-synchro type cable failure positioning pick-up unit of High Performance DSP | |
| CN203910265U (en) | Real-time detection circuit capable of outputting audio quality based on audio decoding chip |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 518000 Guangdong city of Shenzhen province Nanshan District Xili Shahe road building electronic detection Patentee after: China Southern electronic products test (Shenzhen) Limited by Share Ltd Address before: 518000 Guangdong city of Shenzhen province Nanshan District Xili Shahe road building electronic detection Patentee before: Nanfang Nanfang electronic product testing (Shenzhen) Co., Ltd. |
|
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: Electronic detection of Building No. 43 street Shahe road Shenzhen City, Guangdong province 518055 Nanshan District Xili Patentee after: China Southern electronics test (Shenzhen) Limited by Share Ltd Address before: 518000 Guangdong city of Shenzhen province Nanshan District Xili Shahe road building electronic detection Patentee before: Nanfang Nanfang electronic product testing (Shenzhen) Co., Ltd. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 518055 Electronic Testing Building, No. 43 Shahe Road, Xili Street, Nanshan District, Shenzhen City, Guangdong Province Patentee after: China Inspection and Inspection Group South Testing Co., Ltd. Address before: 518055 Electronic Testing Building, No. 43 Shahe Road, Xili Street, Nanshan District, Shenzhen City, Guangdong Province Patentee before: China Southern electronics test (Shenzhen) Limited by Share Ltd |
|
| CP01 | Change in the name or title of a patent holder |