CN105761712A - Keyboard instrument vibration detection mechanism - Google Patents
Keyboard instrument vibration detection mechanism Download PDFInfo
- Publication number
- CN105761712A CN105761712A CN201510952553.1A CN201510952553A CN105761712A CN 105761712 A CN105761712 A CN 105761712A CN 201510952553 A CN201510952553 A CN 201510952553A CN 105761712 A CN105761712 A CN 105761712A
- Authority
- CN
- China
- Prior art keywords
- piezoelectric transducer
- output
- vibrating mass
- detection mechanism
- keyboard instrument
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 109
- 238000012360 testing method Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 9
- 230000010355 oscillation Effects 0.000 claims description 8
- 230000006835 compression Effects 0.000 description 9
- 238000007906 compression Methods 0.000 description 9
- 239000010409 thin film Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 235000019994 cava Nutrition 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H1/00—Details of electrophonic musical instruments
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
- G01H11/08—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means using piezoelectric devices
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- General Physics & Mathematics (AREA)
- Electrophonic Musical Instruments (AREA)
Abstract
The invention discloses a keyboard instrument vibration detection mechanism comprising a single vibration part, which is used to form a keyboard instrument; and a plurality of piezoelectric sensors, which are disposed in the single vibration part, and is in the shape of a line.
Description
Technical field
The present invention relates to the vibration detection mechanism of keyboard instrument.
The application, based on the January 5th, 2015 of the Patent 2015-000329 patent application hereby claims priority in Japanese publication, quotes its content at this.
Background technology
In the musical instruments such as primary sound piano, acoustic guitar, send sound by playing the vibrating mass vibration making musical instrument possess.In vibrating mass, primary sound piano includes soundboard and bridge, and acoustic guitar includes the panel etc. of Qin Qiao, qin body.
In the past, in order to the performance of this musical instrument being converted to the signal of telecommunication to outside output or record, there is the vibration detection mechanism (such as patent documentation 1 (with reference to No. 6677514 description of U.S. Patent No.)) of the vibration using coaxial cable type piezoelectric transducer (wire piezoelectric transducer) to detect vibrating mass.In patent documentation 1, disclose the piezoelectric transducer that wire is set in the qin bridge of the function as vibrating mass in guitar.This piezoelectric transducer extends along the orientation of multiple strings of guitar.
Patent documentation 1: No. 6677514 description of U.S. Patent No.
But, in order to the inside at vibrating mass arranges piezoelectric transducer, it is necessary to form the groove for receiving piezoelectric transducer on vibrating mass.Further, piezoelectric transducer is in order to detect the vibration of vibrating mass, it is necessary to be accommodated in groove so that piezoelectric transducer can be subject to compression stress from vibrating mass always.
But, vibrating mass is mainly made up of timber, it will usually warpage, therefore, it is difficult to the length direction at groove makes the depth dimensions of groove, width dimensions homogeneous.Therefore, the size of the compression stress suffered by piezoelectric transducer is different according to the position of the length direction of groove.As a result of which it is, exist with the vibration of string accordingly from piezoelectric transducer output detect signal size according to string relative to the position of piezoelectric transducer (range of musical instrument) different problems.
Summary of the invention
The present invention makes in view of the foregoing, and an object of the present invention is in that, it is provided that the vibration detection mechanism of a kind of keyboard instrument, it is possible to suppress owing to piezoelectric transducer is relative to the deviation of the accuracy of detection caused by the mounting condition of vibrating mass.
For solving the technical scheme of technical problem
In order to solve above-mentioned problem, the vibration detection mechanism of the keyboard instrument of embodiment of the present invention possesses the single vibrating mass constituting keyboard instrument and is arranged on the inside of described single vibrating mass and has multiple piezoelectric transducers of linear shape.
According to the present invention, by using the multiple detection signals exported from multiple piezoelectric transducers, it is possible to suppress based on the piezoelectric transducer deviation relative to the accuracy of detection of the mounting condition of vibrating mass.
Accompanying drawing explanation
Fig. 1 indicates that the plane graph of the major part of the piano that the vibration detection mechanism of an embodiment of the present invention is suitable for.
Fig. 2 indicates that the axonometric chart of the structure of the piezoelectric transducer of an embodiment of the present invention.
Fig. 3 indicates that in the piano of Fig. 1, and multiple piezoelectric transducers are at the profile of the arranging form of the inside of the first vibrating mass.
Fig. 4 indicates that in the piano of Fig. 1, and multiple piezoelectric transducers are at the profile of second, third vibrating mass each arranging form of inside.
Fig. 5 indicates that the block diagram of the output unit of the vibration detection mechanism of an embodiment of the present invention.
Fig. 6 indicates that the figure of an example of the flow direction of the detection signal exported from multiple output units of an embodiment of the present invention.
Fig. 7 indicates that multiple piezoelectric transducers profile in the first variation of the arranging form of the inside of the first vibrating mass of an embodiment of the present invention.
Fig. 8 indicates that multiple piezoelectric transducers profile in the second variation of the arranging form of the inside of the first vibrating mass of an embodiment of the present invention.
Fig. 9 indicates that multiple piezoelectric transducers profile in the 3rd variation of the arranging form of the inside of the first vibrating mass of an embodiment of the present invention.
Description of reference numerals
1 ... piano (musical instrument), 12 ... soundboard, 14 ... long bridge, 15 ... short bridge main body, 17 ... string, 18 ... short bridge seat, 19 ... short bridge foot, 31 ... the first vibrating mass, 32 ... the second vibrating mass, 33 ... the 3rd vibrating mass, 40,40A1,40A2,40B1,40B2,40C1,40C2 ... piezoelectric transducer, 50 ... output unit, 51 ... burn out detection parts, 52 ... adjust parts, 53 ... blender, 54 ... control portion
Detailed description of the invention
Hereinafter, illustrate with reference to Fig. 1～6 pair an embodiment of the present invention.In the present embodiment, as the keyboard instrument of the vibration detection mechanism of application embodiment of the present invention, a kind of piano 1 as keyboard instrument is exemplified.
As it is shown in figure 1, the piano 1 of this embodiment is a kind of grand piano as primary sound piano.In FIG, the diagram of top cover, string, keyboard etc. is eliminated.Piano 1 possesses as the framework 11 of basic structure, soundboard 12, side plate 13, long bridge 14, short bridge main body 15, multiple stall bars 16 etc..Multiple stall bars 16 are fixed on the lower surface of soundboard 12 in parallel with each other.
Multiple strings 17 (with reference to Fig. 3, Fig. 4) are arranged on the upper surface 12a of soundboard 12, in framework 11, hung string nail and tuning nail is located at from string tuning button 21 or supporting member (not shown) to long bridge 14 or short bridge main body 15.
As shown in Figure 3, Figure 4, long bridge 14, short bridge main body 15 are arranged between the upper surface 12a of soundboard 12 and string 17.Long bridge 14 is fixed on the upper surface 12a of soundboard 12, is clipped between soundboard 12 and string 17.Short bridge main body 15 can be directly anchored to the upper surface 12a of soundboard 12 in the same manner as long bridge 14.In the present embodiment, short bridge main body 15 is fixed on soundboard 12 via short bridge seat 18 and short bridge foot 19.Specifically, short bridge foot 19 is fixed on the upper surface 12a of soundboard 12, and the lower surface of the short bridge seat 18 of tabular is fixed on the upper end of short bridge foot 19.And, short bridge main body 15 is fixed on the upper surface of short bridge seat 18, is clipped between upper surface and the string 17 of short bridge seat 18.Short bridge main body 15 and short bridge foot 19 are offseting one from another on the short upper surface of bridge seat 18 or the direction of lower surface relative to the fixed position of short bridge seat 18.
Make string 17 be impacted by hammer by performance operation and produce vibration.The vibration of string 17 is delivered to soundboard 12 via long bridge 14.Further, the vibration of string 17 is delivered to soundboard 12 via short bridge main body 15, short bridge seat 18, short bridge foot 19.Now soundboard 12, long bridge 14, short bridge main body 15, short bridge seat 18, short bridge foot 19 mainly vibrate on the thickness direction of soundboard 12.
As it is shown in figure 1, from the thickness direction of soundboard 12, long bridge 14, short bridge main body 15, short bridge foot 19 are formed as banding.Further, the length ratio long bridge 14 of short bridge main body 15 and short bridge foot 19 is short.From player side, long bridge 14, short bridge main body 15, short bridge foot 19 are more to tilt to extend in the way of nearby side towards treble side (being seen as right side from player side).
Piano 1 possesses vibration detection mechanism, and it detects the vibration constituting the soundboard 12 of vibrating mass, long bridge 14, short bridge main body 15, short bridge seat 18, short bridge foot 19.Vibration detection mechanism possesses the piezoelectric transducer 40 of wire.Piezoelectric transducer 40 can elastic deformation when being subject to external force from the direction (radially) orthogonal with its length direction.As in figure 2 it is shown, the piezoelectric transducer 40 of present embodiment is coaxial cable type sensor.The section of piezoelectric transducer 40 is circular.Piezoelectric transducer 40 possess heart yearn 41, cover heart yearn 41 outside piezoelectric element thin film 42, be made up of litzendraht wire and from more lateral cover piezoelectric element thin film 42 outer conductive layer 43.The covering part 44 with electrical insulating property that the outside of outer conductive layer 43 is made by polyethylene etc. is protected.
Piezoelectric element thin film 42 is made up of piezoelectric type polymer (piezopolymer), between heart yearn 41 and outer conductive layer 43 as insulator function.In piezoelectric transducer 40, piezoelectric element thin film 42 is subject to compression stress or tensile force, produces the electric charge proportional to this stress.
In the present embodiment, as shown in Fig. 1, Fig. 3, Fig. 4, it is provided with first group of 40A1,40A2 of multiple piezoelectric transducer, second group of 40B1,40B2 of multiple piezoelectric transducers, the 3rd group of 40C1,40C2 of multiple piezoelectric transducers.Sometimes by multiple piezoelectric transducer 40A1,40A2,40B1,40B2,40C1,40C2 are called piezoelectric transducer 40.In the example shown in Fig. 3, multiple piezoelectric transducer 40A1,40A2 are arranged on the inside of the first vibrating mass (single vibrating mass) 31 utilizing soundboard 12 and long bridge 14 to constitute.That is, multiple piezoelectric transducer 40A1,40A2 are arranged between soundboard 12 and long bridge 14.In the example shown in Figure 4, multiple piezoelectric transducer 40B1,40B2 are arranged on the inside of the second vibrating mass (single vibrating mass) 32 utilizing short bridge main body 15 and short bridge seat 18 to constitute.That is, multiple piezoelectric transducer 40B1,40B2 are arranged between short bridge main body 15 and short bridge seat 18.In the example shown in Figure 4, multiple piezoelectric transducer 40C1,40C2 are arranged on the inside of the 3rd vibrating mass (single vibrating mass) 33 utilizing soundboard 12 and short bridge foot 19 to constitute.That is, multiple piezoelectric transducer 40C1,40C2 are arranged between soundboard 12 and short bridge foot 19.In the example shown in Fig. 1, Fig. 3, Fig. 4, it is provided with two piezoelectric transducers 40 in the inside of each vibrating mass 31,32,33, but present embodiment is not limited to such structure.For example, it is possible to arrange more than three piezoelectric transducers 40 in the inside of each vibrating mass 31,32,33.
From the thickness direction (direction vertical with upper surface 12a) of soundboard 12, multiple piezoelectric transducer 40A1,40A2 overlap with long bridge 14, and the bearing of trend along long bridge 14 configures.From the thickness direction of soundboard 12, multiple piezoelectric transducer 40B1,40B2 overlap with short bridge main body 15, and the bearing of trend along short bridge main body 15 configures.From the thickness direction of soundboard 12, multiple piezoelectric transducer 40C1,40C2 overlap with short bridge foot 19, and the bearing of trend along short bridge foot 19 configures.That is, each piezoelectric transducer 40 extends along the orientation of multiple strings 17.
Then, piezoelectric transducer 40A1,40A2 are illustrated relative to the installation constitution of the first vibrating mass 31.
As it is shown on figure 3, be provided with mean for, in the inside of the first vibrating mass 31, multiple paths 35 that multiple piezoelectric transducer 40A1,40A2 individually insert.That is, the first vibrating mass 31 has multiple path 35, and the plurality of path 35 includes the first path 35A1 and the alternate path 35A2 almost parallel for path 35A1 with first.First path 35A1 is only inserted with in multiple piezoelectric transducer 40A1,40A2, i.e. be only inserted with piezoelectric transducer 40A1.Alternate path 35A2 is only inserted with in multiple piezoelectric transducer 40A1,40A2, i.e. be only inserted with piezoelectric transducer 40A2.Path 35 is formed throughout the total length of long bridge 14.In the present embodiment, each path 35 utilizes the upper surface 12a of the groove 36 and soundboard 12 opposed with long bridge 14 formed on the lower surface 14c of the long bridge 14 opposed with soundboard 12 to constitute.Groove 36 face from the table below (the first face) 14c caves in towards upper surface (the second face) 14d of the long bridge 14 being positioned at opposition side with lower surface 14c.In the example shown in Fig. 3, a part for the section of groove 36 is formed as arc-shaped, but present embodiment is not limited to such structure.Such as, the section of groove 36 can be formed as the polygon such as triangle, tetragon.
The area of section along the path 35 on the direction orthogonal with the length direction of path 35 is set to less than the area of section of the piezoelectric transducer 40 along the direction (that is, along the area of section of the piezoelectric transducer 40 of the radial direction of piezoelectric transducer 40).Therefore, each piezoelectric transducer 40A1,40A2 are being put into each groove 36, and, long bridge 14 being fixed under the state of upper surface 12a of soundboard 12, each piezoelectric transducer 40A1,40A2 are subject to compression stress from its outer circumferential side.Such as, the size of ratio each piezoelectric transducer 40A1,40A2 by being set by the depth dimensions of each groove 36 is little, and each piezoelectric transducer 40A1,40A2 are subject to compression stress from the thickness direction of soundboard 12.And, for instance, by by the width of each groove 36 (in figure 3 for left and right directions) to be dimensioned so as to the size than each piezoelectric transducer 40A1,40A2 little, each piezoelectric transducer 40A1,40A2 are subject to compression stress from the width of groove 36.
Multiple piezoelectric transducer 40A1,40A2 of being arranged at the first vibrating mass 31 arrange on the direction orthogonal with the principal oscillation direction of the first vibrating mass 31 (thickness direction of soundboard 12).Thus, multiple piezoelectric transducer 40A1,40A2 are arranged in the equidistant position of the string 17 as vibration source.
In the present embodiment, multiple paths 35 are vacated on the width of long bridge 14 and are spaced.Thus, multiple piezoelectric transducer 40A1,40A2 vacate on the width of long bridge 14 and are spaced.
As shown in Figure 4, the installation constitution of piezoelectric transducer 40B1,40B2,40C1, the 40C2 in the second vibrating mass the 32, the 3rd vibrating mass 33 is identical with the installation constitution of piezoelectric transducer 40A1,40A2 in above-mentioned first vibrating mass 31.
That is, it is provided with mean for, in the inside of the second vibrating mass 32, multiple paths 35 that multiple piezoelectric transducer 40B1,40B2 individually insert.Each path 35 utilizes the groove 36 (identical with the groove 36 formed on the lower surface 14c of long bridge 14) formed on the lower surface of the short bridge main body 15 opposed with short bridge seat 18 and the upper surface of short bridge seat 18 to constitute.Thus, when each piezoelectric transducer 40B1,40B2 putting into each groove 36 and short bridge main body 15 being fixed on the upper surface of short bridge seat 18, each piezoelectric transducer 40B1,40B2 are subject to compression stress from its outer circumferential side.
And, multiple piezoelectric transducer 40B1,40B2 of being arranged at the second vibrating mass 32 arrange on the direction orthogonal with the principal oscillation direction of the second vibrating mass 32 (thickness direction of soundboard 12).
Further, the multiple paths 35 individually inserted for multiple piezoelectric transducer 40C1,40C2 it also are provided with in the inside of the 3rd vibrating mass 33.Each path 35 utilizes the groove 36 (identical with the groove 36 formed on the lower surface 14c of long bridge 14) formed on the lower surface of the short bridge foot 19 opposed with soundboard 12 and the upper surface 12a of soundboard 12 to constitute.Thus, when each piezoelectric transducer 40C1,40C2 putting into each groove 36 and short bridge foot 19 being fixed on the upper surface 12a of soundboard 12, each piezoelectric transducer 40C1,40C2 are subject to compression stress from its outer circumferential side.
And, multiple piezoelectric transducer 40C1,40C2 of being arranged at the 3rd vibrating mass 33 arrange on the direction orthogonal with the principal oscillation direction of the 3rd vibrating mass 33 (thickness direction of soundboard 12).
As mentioned above, each vibrating mass 31,32,33 is provided with in the structure of piezoelectric transducer 40, in the vibration due to string 17 of each vibrating mass 31,32,33 and when displacement, vibrations, the compression stress acted on each piezoelectric transducer 40 changes, and namely each piezoelectric transducer 40 is made a response.Thus, from each piezoelectric transducer 40 output detections signal.
And, as shown in Figure 5, the vibration detection mechanism of present embodiment possesses output unit 50, and this output unit 50 is for exporting outside by the detection signal of multiple piezoelectric transducer 40A1,40A2,40B1,40B2,40C1,40C2 output from the vibrating mass 31,32,33 being arranged at single (same).Output unit 50 is each provided with one relative to multiple vibrating mass 31,32,33.Hereinafter, only the output unit 50 corresponding with the first vibrating mass 31 is illustrated.The structure of the output unit 50 corresponding with second, third vibrating mass 32,33 output unit 50 corresponding with the first vibrating mass 31 is identical.
Output unit 50 possesses: burn out detection parts 51, and it individually detects the broken string of multiple piezoelectric transducer 40A1,40A2 of being arranged at the first vibrating mass 31；Adjusting parts 52, the amplitude detecting signal exported from piezoelectric transducer 40A1,40A2 is adjusted by it according to the testing result of burn out detection parts 51.The adjustment parts 52 of present embodiment possess blender (output block) 53 and control portion 54.
Burn out detection parts 51 utilize multiple test section 51A, 51B of the amplitude such as individually detecting the detection signal from each piezoelectric transducer 40A1,40A2 output to constitute.The testing result of each test section 51A, 51B exports control portion 54.
Blender 53 selects the arbitrary output mode in the first output mode and the second output mode to be carried out.Blender 53, under the first output mode, uses and outputs a signal to outside from the detection signal of all piezoelectric transducer 40A1,40A2 output being arranged at the first vibrating mass 31.Blender 53, under the second output mode, uses detection signal that a part of piezoelectric transducer (at least one piezoelectric transducer) from all piezoelectric transducer 40A1,40A2 exports to output a signal to outside.
Blender 53 is under the first output mode, for instance calculating the meansigma methods detecting signal from all piezoelectric transducer 40A1,40A2 output, the meansigma methods this calculated exports outside as output detections signal.Blender 53 is under the second output mode, when a part of piezoelectric transducer is multiple piezoelectric transducer, such as, calculating the meansigma methods of the detection signal exported from the plurality of piezoelectric transducer, the meansigma methods this calculated exports as output detections signal.Further, blender 53 is under the second output mode, when a part of piezoelectric transducer is a piezoelectric transducer, will export outside from a detection signal of this piezoelectric transducer output directly as output detections signal.
The switching of above-mentioned output mode can manually carry out, but be based in the present embodiment and carry out from the instruction in control portion 54.
The action of blender 53 is controlled by control portion 54 based on the testing result exported from burn out detection parts 51.
Specifically illustrating, control portion 54 is when the amplitude of the detection signal exported from test section 51A reaches below setting, it is judged that the piezoelectric transducer 40A1 corresponding with test section 51A breaks.Control portion 54 is when the amplitude of the detection signal exported from test section 51B reaches below setting, it is judged that the piezoelectric transducer 40A2 broken string corresponding with test section 51B.
And, the action of blender 53, when the arbitrary setting of Amplitude Ratio of the detection signal exported from all of test section 51A, 51B is all big, is controlled, thus implementing the first output mode in blender 53 by control portion 54.And, control portion 54 is when the amplitude of the detection signal that a part of test section 51A, 51B (at least one in all test section 51A, 51B) export reaches below setting, namely, it is judged as, when broken string occurs piezoelectric transducer 40A1,40A2 (at least one in all piezoelectric transducer 40A1,40A2) corresponding with a part of test section 51A, 51B, the action of blender 53 being controlled thus implementing the second output mode in blender 53.
Then, the action example of the output unit 50 of said structure is illustrated.
Such as, being arranged under the state that broken string does not all occur any one in all piezoelectric transducer 40A1,40A2 of the first vibrating mass 31, blender 53 is sent instruction by control portion 54, thus implementing the first output mode.The meansigma methods of the detection signal based on all piezoelectric transducer 40A1,40A2, according to the instruction implementing the first output mode sent from control portion 54, is exported outside as output detections signal by blender 53.
And, for instance, broken string occurs in two piezoelectric transducers 40A1,40A2 being arranged at the first vibrating mass 31, blender 53 is sent instruction by control portion 54, thus implementing the second output mode.Detection signal based on the piezoelectric transducer output never broken, according to the instruction implementing the second output mode sent from control portion 54, is exported outside directly as output detections signal by blender 53.
Control portion 54 can when sending the instruction implementing the second output mode, whether any one in multiple piezoelectric transducer 40A1,40A2 is broken (or, any one in multiple piezoelectric transducer 40A1,40A2 does not break) inform blender 53.As specific example, to blender 53, control portion 54 is notified that piezoelectric transducer 40A1 occurs the situation of broken string to illustrate.In this case, blender 53 can based on this notice, it is intended that the piezoelectric transducer not broken in multiple piezoelectric transducer 40A1,40A2 is piezoelectric transducer 40A2, uses the detection signal from this piezoelectric transducer 40A2 specified output to output a signal to outside.
Control portion 54 can send implement the second output mode instruction time, by whether any one in multiple piezoelectric transducer 40A1,40A2 occurs disconnection notification to blender 53.In this case, blender 53 is based on the testing result exported from burn out detection parts 51, it is intended that the piezoelectric transducer not broken in multiple piezoelectric transducer 40A1,40A2.It addition, blender 53 can use the detection signal from the output of this piezoelectric transducer specified to output a signal to outside.
In above-mentioned action example, the situation that piezoelectric transducer is two being arranged at the first vibrating mass 31 is illustrated, but present embodiment is not limited to such situation.Such as piezoelectric transducer can be more than three.In this case, when burn out detection parts 51 detect the broken string of a part of piezoelectric transducer, blender 53 is based on the testing result exported from burn out detection parts 51, and the meansigma methods of the detection signal exported by all the other piezoelectric transducers such as never broken exports as output detections signal.Further, when all the other piezoelectric transducers not broken are one, the detection signal from remaining piezoelectric transducer output is directly exported outside by blender 53.
Then, from the output detections signal of multiple output units 50 output corresponding with multiple vibrating mass 31,32,33, for instance shown in Fig. 6, it is possible to as voice data record in record portion 61, or export outside as acoustical signal.Record voice data in record portion 61 can be used in the reproduction etc. of sound.The output detections signal of multiple output units 50 such as can export outside as shown in Figure 6 in blender 62 after mixing but it also may such as individually exports.Further, the output detections signal of multiple output units 50, it is possible to such as individually record portion 61 is arrived in output as shown in Figure 6 but it also may such as after mixing, record portion 61 is arrived in output in blender 62.Further, output detections signal can such as record or output after amplifier 63 amplifies as shown in Figure 6.The output detections signal exported from multiple output units 50 such as can be performed individually amplification by amplifier 63 as shown in Figure 6, it is also possible to be such as amplified at the mixed signal of blender 62.
And it is possible to optionally record or export a part (at least one in multiple output detections signals) for the output detections signal from multiple output units 50.Such as, piezoelectric transducer 40B1,40B2,40C1,40C2 of being arranged at the second vibrating mass 32 and the 3rd vibrating mass 33 predominantly detect the vibration of identical range.Accordingly it is also possible to only record or export the output detections signal of an output unit in corresponding two output unit 50.And it is possible to the side at the second vibrating mass 32 and the 3rd vibrating mass 33 arranges such as piezoelectric transducer 40.
Vibration detection mechanism as discussed above, according to the piano 1 of present embodiment, exports outside by the output detections signal based on the multiple detection signals exported from the multiple piezoelectric transducers 40 being arranged at single vibrating mass 31,32 or 33.Therefore, it is possible to suppress based on the piezoelectric transducer 40 deviation relative to the accuracy of detection of the mounting condition of vibrating mass 31,32 or 33.Namely, the vibration output that can suppress the string 17 based on formed objects is different according to the position (range of piano 1) of the length direction of piezoelectric transducer 40 to the size of outside output detections signal, therefore, it is possible to realize the homogenization of the size of output detections signal.
And, vibration detection mechanism according to present embodiment, it is provided with multiple piezoelectric transducer 40, it is assumed that even if a part of piezoelectric transducer 40 breaks, it is also possible to the detection signal exported from remaining piezoelectric transducer 40 is exported to outside at single vibrating mass 31,32 or 33.Therefore, there is no need to change the piezoelectric transducer 40 that broken string occurs, it becomes possible to the performance of piano 1 is converted to the signal of telecommunication and exports to outside or be recorded.Further, even if a part of piezoelectric transducer 40 arranged on single vibrating mass 31,32 or 33 in the performance of piano 1 breaks, it is also possible to proceed the performance of piano 1.
In the piano 1 of present embodiment, the parts (such as soundboard 12 and long bridge 14) being clipped in the middle by piezoelectric transducer 40 are each other by being adhesively fixed.Therefore, the replacing of piezoelectric transducer 40 is difficult to.Therefore, it is particularly effective for the structure of piezoelectric transducer 40 need not be changed.
And, in the vibration detection mechanism of present embodiment, when by the multiple detection signals exported from the multiple piezoelectric transducers 40 being arranged at single vibrating mass 31,32 or 33 mixing when making output detections signal export outside, using the meansigma methods of multiple detection signals as output detections signal.Further, when based on when output detections signal being exported outside from a detection signal of piezoelectric transducer 40 output, signal is detected directly as output detections signal with one.That is, the amplitude in vibration detection mechanism, according to the detection signal that the testing result adjustment of burn out detection parts 51 exports from the piezoelectric transducer 40 being arranged at single vibrating mass 31,32,33.Therefore, even if a part of piezoelectric transducer 40 being arranged at single vibrating mass 31,32 or 33 in the performance of piano 1 breaks, it is also possible to maintain the output amplitude to outside output detections signal.Therefore, it is possible to prevent a part of piezoelectric transducer 40 from the obstruction that piano 1 is played by broken string occurring.
Further, the vibration detection mechanism according to present embodiment, the multiple piezoelectric transducers 40 being arranged at single vibrating mass 31,32 or 33 arrange on the direction orthogonal with the principal oscillation direction of this single vibrating mass 31,32 or 33.Therefore, diminish from the string 17 as vibration source to the difference of the distance of multiple piezoelectric transducers 40, or, it is absent from the difference of distance.Thus, utilize the condition that the vibration of single vibrating mass 31,32 or 33 is detected by multiple piezoelectric transducer 40 closer to each other.As a result of which it is, the difference produced in the vibration characteristics of the vibrating mass 31,32 or 33 detected in multiple piezoelectric transducers 40 can be suppressed, or eliminate this difference.Therefore, with from string 17 to compared with the big situation of the difference of the distance of multiple piezoelectric transducers 40, it is possible to increase the repeatability of the distinctive tone color of piano 1.
Above, embodiments of the present invention are illustrated in detail, but the invention is not restricted to above-mentioned embodiment, various change can be implemented without departing from the scope of the subject in the invention.
Such as, it is arranged at each path 35 of the first vibrating mass 31, as shown in Figure 7, it is possible to utilize the lower surface 14c of the groove 36 and long bridge 14 opposed with soundboard 12 formed on the upper surface 12a of the soundboard 12 corresponding with long bridge 14 to constitute.Further, each path 35 of the first vibrating mass 31 can utilize the groove 36 such as formed in both long bridge 14 and soundboard 12 to constitute.
Further, multiple piezoelectric transducer 40A1,40A2 of arranging in the inside of the first vibrating mass 31 are such as shown in Fig. 8, it is possible to be arranged on the inside of long bridge 14.That is, the first vibrating member 31 such as can be constituted merely with long bridge 14.In this case, long bridge 14 is divided into two dividing bodies 14A, 14B, and two dividing bodies 14A, 14B opposite each other opposed faces one or both on form the groove 36 identical with above-mentioned embodiment.
In the structure illustrated in Fig. 8, two dividing bodies 14A, 14B are from soundboard 12 towards arrangement on the direction of string 17.Therefore, identical with the situation of above-mentioned embodiment, it is possible to by multiple piezoelectric transducer 40A1,40A2 in the internal arrangement of long bridge 14 on the direction orthogonal with the principal oscillation direction of long bridge 14.In the structure illustrated in Fig. 8, two dividing bodies 14A, 14B such as can be through splitting the bridge base of long bridge 14 and the parts that obtain.
Further, multiple piezoelectric transducer 40A1,40A2 of arranging in the inside of the first vibrating mass 31 are such as shown in Fig. 9, it is possible to arrange on the principal oscillation direction of the first vibrating mass 31.In this case, such as shown in Fig. 9, long bridge 14 can be divided into from soundboard 12 towards multiple (being two in fig .9) dividing body 14A, 14B of arrangement on the direction of string 17, and at adjacent dividing body 14A, 14B each other, piezoelectric transducer 40A1, a 40A2 can be respectively equipped with between long bridge 14 and soundboard 12.
And, when multiple piezoelectric transducer 40A1,40A2 arrange on the principal oscillation direction of the first vibrating mass 31, long bridge 14 such as can be divided into two dividing bodies in its width (in fig .9 for left and right directions) upper arrangement, multiple piezoelectric transducer 40A1,40A2 are set between the two dividing body.
Multiple piezoelectric transducer 40A1,40A2 illustrated in Fig. 7～9 also are able to the arranging form being applicable to multiple piezoelectric transducer 40B1,40B2,40C1,40C2 relative to second, third vibrating mass 32,33 relative to the arranging form of the first vibrating mass 31.
Further, multiple piezoelectric transducer 40C1,40C2 of arranging in the inside of the 3rd vibrating mass 33 can be arranged on such as between short bridge seat 18 and short bridge foot 19.That is, the 3rd vibrating mass 33 such as can utilize short bridge seat 18 and short bridge foot 19 to constitute.
Further, in the blender 53 of output unit 50, for instance, it is possible to make the summation of the detection signal of the multiple piezoelectric transducers 40 never broken output export outside as output detections signal.In this case, identical with the situation of above-mentioned embodiment, it is possible to suppress the deviation of the accuracy of detection produced based on the piezoelectric transducer 40 mounting condition relative to vibrating mass 31,32,33.
Further, the vibration source that vibrating mass 31,32,33 vibrates is made to be not limited to string 17, it is also possible to be such as make soundboard 12 as the transducer of speaker function based on making soundboard 12 directly vibrate from the signal of telecommunication of externally input.In this case, it is possible to utilize piezoelectric transducer 40 detect soundboard 12 and be arranged on the vibration of the long bridge 14 on this soundboard 12, short bridge foot 19, short bridge seat 18, short bridge main body 15.
Further, piezoelectric transducer 40 can be the ribbon cable type sensor for example formed as banding.
Further, the vibration detection mechanism of embodiment of the present invention can be applied to the musical instrument with vibrating mass, for instance, the various musical instruments such as the percussion instrument such as stringed musical instrument, drum such as other keyboard instruments, acoustic guitar, violin such as upright piano.
Claims (10)
1. the vibration detection mechanism of a keyboard instrument, it is characterised in that possess:
Single vibrating mass, it constitutes keyboard instrument；
Multiple piezoelectric transducers, it is arranged on the inside of described single vibrating mass, and has linear shape.
2. the vibration detection mechanism of keyboard instrument according to claim 1, it is characterised in that
It is also equipped with individually detecting the burn out detection parts of the broken string of multiple described piezoelectric transducer.
3. the vibration detection mechanism of keyboard instrument according to claim 2, it is characterised in that
It is also equipped with the adjustment parts that the amplitude of the detection signal of at least one output from multiple described piezoelectric transducers is adjusted by the testing result according to described burn out detection parts.
4. the vibration detection mechanism of the keyboard instrument according to any one of claim 1 to claim 3, it is characterised in that
Multiple described piezoelectric transducers arrange on the direction orthogonal with the principal oscillation direction of described vibrating mass.
5. the vibration detection mechanism of keyboard instrument according to claim 1 and 2, it is characterised in that
It is also equipped with the output block meansigma methods of the multiple detection signals exported from multiple described piezoelectric transducers exported to the outside of described vibration detection mechanism as output detections signal.
6. the vibration detection mechanism of keyboard instrument according to claim 1 and 2, it is characterised in that
It is also equipped with the output block summation of the multiple detection signals exported from multiple described piezoelectric transducers exported to the outside of described vibration detection mechanism.
7. the vibration detection mechanism of keyboard instrument according to claim 1, it is characterised in that be also equipped with:
Burn out detection parts, it individually detects the broken string of multiple described piezoelectric transducer；
Output block, in multiple described piezoelectric transducers, when not detected that at least one piezoelectric transducer of broken string is only a piezoelectric transducer by described burn out detection parts, the detection signal from the one piezoelectric transducer output being not detected at broken string is exported to the outside of vibration detection mechanism by described output block as output detections signal.
8. the vibration detection mechanism of keyboard instrument according to claim 7, it is characterised in that
The meansigma methods of the multiple detection signals from the plurality of piezoelectric transducer output being not detected at broken string, when at least one piezoelectric transducer described is multiple piezoelectric transducer, is exported by described output block as described output detections signal.
9. the vibration detection mechanism of keyboard instrument according to claim 7, it is characterised in that
The summation of the multiple detection signals from the multiple piezoelectric transducers output being not detected at broken string, when at least one piezoelectric transducer described is multiple piezoelectric transducer, is exported by described output block as described output detections signal.
10. the vibration detection mechanism of keyboard instrument according to claim 1, it is characterised in that
The vibration of vibrating mass described in each Autonomous test of multiple piezoelectric transducers, output represents the detection signal of the described vibration detected.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015-000329 | 2015-01-05 | ||
| JP2015000329A JP2016126191A (en) | 2015-01-05 | 2015-01-05 | Vibration detection mechanism of musical instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105761712A true CN105761712A (en) | 2016-07-13 |
Family
ID=56342162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510952553.1A Pending CN105761712A (en) | 2015-01-05 | 2015-12-17 | Keyboard instrument vibration detection mechanism |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2016126191A (en) |
| CN (1) | CN105761712A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109443513A (en) * | 2018-10-18 | 2019-03-08 | 湖南城市学院 | A kind of violin bridge vibration detecting system |
| CN111684520A (en) * | 2018-02-05 | 2020-09-18 | 雅马哈株式会社 | Signal output device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107039048A (en) * | 2017-04-01 | 2017-08-11 | 华东交通大学 | A kind of piano soundboard acoustic quality comprehensive evaluating method |
| CN107016986A (en) * | 2017-05-27 | 2017-08-04 | 陈丽娜 | A kind of soft whip of pickup and stringed musical instrument |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020117047A1 (en) * | 1999-07-02 | 2002-08-29 | Fishman Lawrence R. | Coaxial musical instrument transducer |
| CN2812198Y (en) * | 2004-03-17 | 2006-08-30 | 雅马哈株式会社 | Keyboard instrument |
| CN101908336A (en) * | 2009-06-03 | 2010-12-08 | 雅马哈株式会社 | The pickup unit of electric stringed instrument |
-
2015
- 2015-01-05 JP JP2015000329A patent/JP2016126191A/en active Pending
- 2015-12-17 CN CN201510952553.1A patent/CN105761712A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020117047A1 (en) * | 1999-07-02 | 2002-08-29 | Fishman Lawrence R. | Coaxial musical instrument transducer |
| CN2812198Y (en) * | 2004-03-17 | 2006-08-30 | 雅马哈株式会社 | Keyboard instrument |
| CN101908336A (en) * | 2009-06-03 | 2010-12-08 | 雅马哈株式会社 | The pickup unit of electric stringed instrument |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111684520A (en) * | 2018-02-05 | 2020-09-18 | 雅马哈株式会社 | Signal output device |
| CN111684520B (en) * | 2018-02-05 | 2023-08-29 | 雅马哈株式会社 | Signal output device |
| CN109443513A (en) * | 2018-10-18 | 2019-03-08 | 湖南城市学院 | A kind of violin bridge vibration detecting system |
| CN109443513B (en) * | 2018-10-18 | 2020-11-03 | 湖南城市学院 | Violin bridge vibration detection system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2016126191A (en) | 2016-07-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105761712A (en) | Keyboard instrument vibration detection mechanism | |
| EP1600940B1 (en) | Pickup device for plucked string instrument and plucked string instrument | |
| US4228715A (en) | Strain-gauge sound pickup for string instrument | |
| JP2013142872A (en) | Electronic percussion instrument | |
| KR20060113475A (en) | Stringed instrument and transducer used therein and installation structure of the same | |
| US10692479B2 (en) | Musical instrument pickup and musical instrument | |
| JP3804637B2 (en) | String instruments and strings | |
| US20080173165A1 (en) | Stringed Musical Instrument with Enhanced Musical Sound | |
| US9958314B2 (en) | Vibration detection mechanism and vibration sensor unit | |
| JP2013238835A (en) | Stringed instrument | |
| JP2006308870A (en) | Stringed instrument, and fitting structure for transducing device used therefor | |
| JP7098219B1 (en) | Stringed instrument exciter and stringed instrument exciter system | |
| US5484958A (en) | Musical instrument and a method of applying a low impedance amplifier to a musical instrument | |
| JP2017067913A (en) | Sound board speaker of electronic piano | |
| JP2016080883A (en) | Musical instrument | |
| JP3864847B2 (en) | Vibration detector, piece and stringed instrument | |
| JP4356630B2 (en) | Plucked strings and pickups for plucked instruments | |
| WO2015122490A1 (en) | Keyboard instrument | |
| US10614783B2 (en) | Percussion instrument with a plurality of sound zones | |
| JP2016126192A (en) | Keyboard instrument | |
| JP2017049386A (en) | Sound production control device | |
| JP4239860B2 (en) | Bowed instrument piece and bowed instrument | |
| WO2016143182A1 (en) | Musical instrument | |
| JP6417846B2 (en) | Stringed instrument | |
| GB2536945A (en) | Pickup for a string instrument |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160713 |