CN204389017U - A kind of national bass bowed instrument soundboard impedance measurement device - Google Patents
A kind of national bass bowed instrument soundboard impedance measurement device Download PDFInfo
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- CN204389017U CN204389017U CN201520061774.5U CN201520061774U CN204389017U CN 204389017 U CN204389017 U CN 204389017U CN 201520061774 U CN201520061774 U CN 201520061774U CN 204389017 U CN204389017 U CN 204389017U
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- soundboard
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- power amplifier
- bass
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Abstract
The utility model provides a kind of national bass bowed instrument soundboard impedance measurement device, comprise processor, AVC power amplifier, mechanical vibrator and non-contact laser microphone four major part, wherein processor and AVC power amplifier are electrically connected, AVC power amplifier and mechanical vibrator are electrically connected, the mechanical vibration that mechanical vibrator produces pass to the code bridge of bass bowed instrument by push rod, a face close contact of code bridge and soundboard, non-contact laser microphone be then positioned at soundboard another face and with soundboard noncontact, non-contact laser microphone and processor are electrically connected; The push rod of mechanical vibrator is also provided with force cell and speed pickup, and force cell and speed pickup are electrically connected with AVC power amplifier respectively, and force cell is also electrically connected with processor.The utility model is by recording driving force F, and the angle phi that the sound level detected by non-contact laser microphone and processor export can try to achieve transaudient speed V accurately, fast, and then obtain input impedance or the mechanical impedance of soundboard, for the judgement of soundboard acoustic quality provides foundation.
Description
Technical field
The utility model relates to a kind of national bass bowed instrument soundboard impedance measurement device, belongs to instrumental acoustics attribute test technical field.
Background technology
Bass bowed instrument is when sounding, and originally the string be vibrated is needing the inertia resistance overcoming soundboard, and this is called input impedance or the mechanical impedance of soundboard.This impedance to be passed to from string the process of soundboard at energy and is played very large effect, is also weigh the most important physical parameter of soundboard acoustic quality.
Those skilled in the art know usually, and between unit, mechanical impedance is larger, and the loss of energy is larger, and the consumption of energy is faster, so there is formula: Z=F/V, wherein Z is the input impedance of soundboard, and F is driving force, and V is the transaudient speed of soundboard.As can be seen from formula, input impedance Z is directly proportional to initial driving force F, is inversely proportional to, and will obtains this constant of Z with transaudient speed, just must measure driving force F and transaudient speed V.At present, then ripe and stable measurement mechanism is not also had for measuring the impedance of bass bowed instrument soundboard.
Utility model content
For above deficiency, the utility model provides a kind of national bass bowed instrument soundboard impedance measurement device, for input impedance or the mechanical impedance of Measurement accuracy soundboard.
The technical solution of the utility model: a kind of national bass bowed instrument soundboard impedance measurement device, comprise processor, AVC power amplifier, mechanical vibrator and non-contact laser microphone four major part, wherein processor and AVC power amplifier are electrically connected, AVC power amplifier and mechanical vibrator are electrically connected, the mechanical vibration that mechanical vibrator produces pass to the code bridge of bass bowed instrument by push rod, a face close contact of code bridge and soundboard, non-contact laser microphone be then positioned at soundboard another face and with soundboard noncontact, non-contact laser microphone and processor are electrically connected, the push rod of mechanical vibrator is also provided with force cell and speed pickup, and force cell and speed pickup are electrically connected with AVC power amplifier respectively, and force cell is also electrically connected with processor.
The beneficial effects of the utility model: the measurement mechanism provided by the utility model, driving force F can be recorded accurately and rapidly, and the angle phi that the sound level detected by non-contact laser microphone and processor export tries to achieve transaudient speed V, and then obtain input impedance or the mechanical impedance of soundboard, for the judgement of soundboard acoustic quality provides foundation.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model.
Embodiment
As shown in Figure 1, a kind of national bass bowed instrument soundboard impedance measurement device, comprise processor, AVC power amplifier, mechanical vibrator and non-contact laser microphone four major part, wherein processor and AVC power amplifier are electrically connected, AVC power amplifier and mechanical vibrator are electrically connected, the mechanical vibration that mechanical vibrator produces pass to the code bridge of bass bowed instrument by push rod, a face close contact of code bridge and soundboard, non-contact laser microphone be then positioned at soundboard another face and with soundboard noncontact, non-contact laser microphone and processor are electrically connected; The push rod of mechanical vibrator is also provided with force cell and speed pickup, and force cell and speed pickup are electrically connected with AVC power amplifier respectively, and force cell is also electrically connected with processor.
Principle of work: first processor send a 20Hz ~ 10KHz sound swept-frequency signal (swept-frequency signal be exactly one within the time of unit, the continuous increasing or decreasing of frequency, the continuous print signal of linear change), signal amplifies rear drive mechanical vibrator through AVC power amplifier, mechanical vibrator just looks like that a loudspeaker is the same, and the electric signal of the change from AVC power amplifier is transformed into mechanical vibration.These mechanical vibration pass to code bridge and the soundboard of bass bowed instrument by push rod, and at the opposite side of soundboard, utilize non-contact laser microphone to be collected by the Vibration Condition of soundboard, new transition of laying equal stress on becomes electric signal, send into processor and analyze.Adopting non-contact laser microphone, is to reduce impact that additional microphone vibrates soundboard and the vibration interference from soundboard outside.The vibration exported the change procedure of swept-frequency signal from 20Hz ~ 10kHz due to mechanical vibrator changes, therefore on the push rod of mechanical vibrator, installed force cell and a speed pickup, these two sensors can measure the more accurate Vibration Condition of push rod.
In addition, the multiple that force cell and a speed pickup amplify to control AVC power amplifier signal is utilized, i.e. gain.When the amplitude of push rod is lower than specified amplitude, just improves the gain of AVC power amplifier, make the value that amplitude reaches specified; When the amplitude of push rod is lower than specified amplitude, just reduce the gain of AVC power amplifier, finally make amplitude constant on the ratings of setting.
The driving force F in the middle of above-mentioned formula Z=F/V directly can be obtained by force cell, the angle phi that the sound level detected by contactless microphone and processor export can in the hope of vibration velocity V, by these two amounts we just can obtain required must input impedance or mechanical impedance Z.
Claims (1)
1. a national bass bowed instrument soundboard impedance measurement device, it is characterized in that: comprise processor, AVC power amplifier, mechanical vibrator and non-contact laser microphone four major part, wherein processor and AVC power amplifier are electrically connected, AVC power amplifier and mechanical vibrator are electrically connected, the mechanical vibration that mechanical vibrator produces pass to the code bridge of bass bowed instrument by push rod, a face close contact of code bridge and soundboard, non-contact laser microphone be then positioned at soundboard another face and with soundboard noncontact, non-contact laser microphone and processor are electrically connected; The push rod of mechanical vibrator is also provided with force cell and speed pickup, and force cell and speed pickup are electrically connected with AVC power amplifier respectively, and force cell is also electrically connected with processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520061774.5U CN204389017U (en) | 2015-01-25 | 2015-01-25 | A kind of national bass bowed instrument soundboard impedance measurement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520061774.5U CN204389017U (en) | 2015-01-25 | 2015-01-25 | A kind of national bass bowed instrument soundboard impedance measurement device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204389017U true CN204389017U (en) | 2015-06-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520061774.5U Expired - Fee Related CN204389017U (en) | 2015-01-25 | 2015-01-25 | A kind of national bass bowed instrument soundboard impedance measurement device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204389017U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060109A (en) * | 2018-08-22 | 2018-12-21 | 湖南城市学院 | Violoncello resonant tank informationization acoustic detection method and system based on resistance technique |
-
2015
- 2015-01-25 CN CN201520061774.5U patent/CN204389017U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060109A (en) * | 2018-08-22 | 2018-12-21 | 湖南城市学院 | Violoncello resonant tank informationization acoustic detection method and system based on resistance technique |
| CN109060109B (en) * | 2018-08-22 | 2021-12-24 | 湖南城市学院 | Informatization acoustic detection method and system for cello resonance box based on impedance technology |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150610 Termination date: 20170125 |