CN202406293U - Multi-sound-source testing system used for piezoelectric ceramic loudspeaker - Google Patents
Multi-sound-source testing system used for piezoelectric ceramic loudspeaker Download PDFInfo
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- CN202406293U CN202406293U CN2011204763352U CN201120476335U CN202406293U CN 202406293 U CN202406293 U CN 202406293U CN 2011204763352 U CN2011204763352 U CN 2011204763352U CN 201120476335 U CN201120476335 U CN 201120476335U CN 202406293 U CN202406293 U CN 202406293U
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Abstract
A multi-sound-source testing system used for a piezoelectric ceramic loudspeaker comprises a main control unit, an audio signal output unit, a modulation amplification unit, a tested piece unit, and a voltage current detection unit; wherein, the audio signal output unit comprises a plurality of sound sources and a multi-channel switch 1; the plurality of sound sources are connected with corresponding signal input ends of the multi-channel switch 1; a control signal input end of the multi-channel switch 1 is connected with a corresponding signal output end of the main control unit; and an output of the multi-channel switch 1 is connected with a corresponding signal input end of the modulation amplification unit. By adopting various different external sound sources, MP3 sound sources, sine wave signal sources and square wave signal sources digitally synthesized by a DDS (Direct Digital Synthesizer), the multi-sound-source testing system of the utility model can precisely generate an audio frequency sweep signal having multiple channels and multiple characteristics. Therefore, compared with an analog type signal source, the multi-sound-source testing system has the advantages of precision, stabilization, and controllability.
Description
Technical field
The present invention relates to a kind of reliability test system of loud speaker, a kind of multitone source test macro that is used for piezoelectric ceramic loudspeaker of saying so exactly.
Background technology
Portable type electronic product such as computer, mobile phone has become the present people necessary part of living, and loud speaker plays an important role as the critical component in these electronic products.Loud speaker is commonly called as and is loudspeaker, and it is a kind of electro-acoustic element that converts electrical energy into acoustic energy.The kind of loud speaker is a lot, though their working method is different, finally all is to promote ambient air through producing mechanical oscillation, thereby makes air dielectric produce the conversion that fluctuation realizes " electricity-Li-sound ".Widely applying the loud speaker aspect high-fidelity music center now all is dynamic speaker mostly.Several kinds of other comparatively common electrostatic in addition, flat, piezoelectric ceramic pieces etc.
Piezoelectric ceramic loudspeaker is a kind of novel electro-acoustic element that is used widely in recent years; But remain blank to the dedicated reliable property testing equipment of this novel electro-acoustic element; Traditional loud speaker reliability testing equipment generally only detects the speaker operation change in current, and can not differentiate the failure phenomenon that causes owing to piezoelectric ceramic capacitive reactance ANOMALOUS VARIATIONS.
At present, ultrathin piezoelectric ceramic loudspeaker is mainly used in some novel portable type electronic products, during its reliability testing, adopts single source of sound test usually, and reliability is not high.
Summary of the invention
The objective of the invention is to adopt the problem of single source of sound reliable measurement property, propose a kind of system that adopts a plurality of sources of sound to detect the piezoelectric ceramic loudspeaker reliability to piezoelectric ceramic loudspeaker.
Technical scheme of the present invention is:
A kind of multitone source test macro that is used for piezoelectric ceramic loudspeaker; It comprises main control unit, audio signal output unit, modulation amplifying unit, measured piece unit and electric current and voltage detecting unit; The signal input part of described electric current and voltage detecting unit is gathered voltage, the electric current of measured piece unit as the signals collecting end of reliability test system; The detection signal output of electric current and voltage detecting unit links to each other with the respective signal input of main control unit; The control signal output ends of main control unit links to each other with the corresponding control signal input of audio signal output unit; The pumping signal output of audio signal output unit links to each other with the respective signal input of modulation amplifying unit, and the output of modulation amplifying unit links to each other with the corresponding pumping signal input of measured piece unit; Described audio signal output unit comprises a plurality of sources of sound and variable connector one; A plurality of sources of sound are connected with the respective signal input of variable connector one; The signal input end of variable connector one is connected with the respective signal output of main control unit, and the output of variable connector one links to each other with the respective signal input of modulation amplifying unit.
Main control unit of the present invention is connected with memory cell, and the signal input part of main control unit connects with the corresponding output of keying unit, and the shows signal output of main control unit links to each other with the corresponding input of display unit.
A plurality of source of sound of the present invention comprises external sound source, sinusoidal wave source of sound and square wave source of sound.
Modulation amplifying unit of the present invention comprises D/A adjustment module, multiplier, variable connector two, a N power amplifier and N group DPDT diverter switch; The D/A adjustment module is used to control multiplier; Its signal input end links to each other with the respective signal output of main control unit; The reference input of multiplier links to each other with the corresponding pumping signal output of audio signal output unit; The signal output part of the multiplier of D/A adjustment module control links to each other with the respective signal input of variable connector two; The signal output part of variable connector two connects with corresponding N power amplifier, and each power amplifier is connected with each piezoelectric ceramic loudspeaker through the corresponding DPDT diverter switch in each road respectively.
Beneficial effect of the present invention:
Native system adopts multiple different external source of sound, MP3 source of sound and synthetic sine wave and the square-wave signal source of DDS numeral; The a plurality of passages of generation that can be accurate, the audio frequency swept-frequency signal of multifrequency nature; With respect to the signal source of analog form, have more precision, stable, controlled characteristics.
Description of drawings
Fig. 1 is a principle of the invention block diagram.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described.
As shown in Figure 1; A kind of multitone source test macro that is used for piezoelectric ceramic loudspeaker; It comprises main control unit, audio signal output unit, modulation amplifying unit, measured piece unit and electric current and voltage detecting unit; The signal input part of described electric current and voltage detecting unit is gathered voltage, the electric current of measured piece unit as the signals collecting end of reliability test system; The detection signal output of electric current and voltage detecting unit links to each other with the respective signal input of main control unit; The control signal output ends of main control unit links to each other with the corresponding control signal input of audio signal output unit, and the pumping signal output of audio signal output unit links to each other with the respective signal input of modulation amplifying unit, and the output of modulation amplifying unit links to each other with the corresponding pumping signal input of measured piece unit; Described audio signal output unit comprises a plurality of sources of sound and variable connector one; A plurality of sources of sound are connected with the respective signal input of variable connector one; The signal input end of variable connector one is connected with the respective signal output of main control unit, and the output of variable connector one links to each other with the respective signal input of modulation amplifying unit.
Main control unit of the present invention is connected with memory cell, and the signal input part of main control unit connects with the corresponding output of keying unit, and the shows signal output of main control unit links to each other with the corresponding input of display unit.
A plurality of source of sound of the present invention comprises external sound source, MP3 source of sound, sinusoidal wave source of sound and square wave source of sound.
Modulation amplifying unit of the present invention comprises D/A adjustment module, multiplier, variable connector two, a N power amplifier and N group DPDT diverter switch; The D/A adjustment module is used to control multiplier; Its signal input end links to each other with the respective signal output of main control unit; The reference input of multiplier links to each other with the corresponding pumping signal output of audio signal output unit; The signal output part of the multiplier of D/A adjustment module control links to each other with the respective signal input of variable connector two; The signal output part of variable connector two connects with corresponding N power amplifier, and each power amplifier is connected with each piezoelectric ceramic loudspeaker through the corresponding DPDT diverter switch in each road respectively.
Native system adopts multiple different external source of sound, MP3 source of sound and synthetic sine wave and the square-wave signal source of DDS numeral; The a plurality of passages of generation that can be accurate, the audio frequency swept-frequency signal of multifrequency nature; With respect to the signal source of analog form, have more precision, stable, controlled characteristics.
During work; Main control unit produces satisfactory audio frequency swept-frequency signal through the audio signal output unit; Be applied on each loud speaker that is connected on the power amplifier of N road through variable connector; Operating current on the real-time acquisition test loud speaker of multichannel sampling unit, and judge loud speaker whether overcurrent or open fault.
The present invention does not relate to all identical with the prior art prior art that maybe can adopt of part and realizes.
Claims (4)
1. multitone source test macro that is used for piezoelectric ceramic loudspeaker; It comprises main control unit, audio signal output unit, modulation amplifying unit, measured piece unit and electric current and voltage detecting unit; The signal input part of described electric current and voltage detecting unit is gathered voltage, the electric current of measured piece unit as the signals collecting end of reliability test system; The detection signal output of electric current and voltage detecting unit links to each other with the respective signal input of main control unit; The control signal output ends of main control unit links to each other with the corresponding control signal input of audio signal output unit; The pumping signal output of audio signal output unit links to each other with the respective signal input of modulation amplifying unit, and the output of modulation amplifying unit links to each other with the corresponding pumping signal input of measured piece unit; It is characterized in that described audio signal output unit comprises a plurality of sources of sound and variable connector one; A plurality of sources of sound are connected with the respective signal input of variable connector one; The signal input end of variable connector one is connected with the respective signal output of main control unit, and the output of variable connector one links to each other with the respective signal input of modulation amplifying unit.
2. the multitone source test macro that is used for piezoelectric ceramic loudspeaker according to claim 1; It is characterized in that described main control unit is connected with memory cell; The signal input part of main control unit connects with the corresponding output of keying unit, and the shows signal output of main control unit links to each other with the corresponding input of display unit.
3. the multitone source test macro that is used for piezoelectric ceramic loudspeaker according to claim 1 is characterized in that described a plurality of source of sound comprises external sound source, sinusoidal wave source of sound and square wave source of sound.
4. the multitone source test macro that is used for piezoelectric ceramic loudspeaker according to claim 1; It is characterized in that described modulation amplifying unit comprises D/A adjustment module, multiplier, variable connector two, a N power amplifier and N group DPDT diverter switch; The D/A adjustment module is used to control multiplier; Its signal input end links to each other with the respective signal output of main control unit; The reference input of multiplier links to each other with the corresponding pumping signal output of audio signal output unit; The signal output part of the multiplier of D/A adjustment module control links to each other with the respective signal input of variable connector two, and the signal output part of variable connector two connects with corresponding N power amplifier, and each power amplifier is connected with each piezoelectric ceramic loudspeaker through the corresponding DPDT diverter switch in each road respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204763352U CN202406293U (en) | 2011-11-25 | 2011-11-25 | Multi-sound-source testing system used for piezoelectric ceramic loudspeaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204763352U CN202406293U (en) | 2011-11-25 | 2011-11-25 | Multi-sound-source testing system used for piezoelectric ceramic loudspeaker |
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| CN202406293U true CN202406293U (en) | 2012-08-29 |
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| CN2011204763352U Expired - Fee Related CN202406293U (en) | 2011-11-25 | 2011-11-25 | Multi-sound-source testing system used for piezoelectric ceramic loudspeaker |
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- 2011-11-25 CN CN2011204763352U patent/CN202406293U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120829 Termination date: 20151125 |