JPH0659667A - Keyboard musical instrument - Google Patents

Abstract

PURPOSE:To change piano sound and string beating sound by an electronic sound source over to each other by stopping revolution of a hammer by a key immediately before string beating in accordance with selection. CONSTITUTION:A key sensor 230 is arranged below a key 201, and this key sensor 230 is connected to a control means 70. The control means 70 is furnished with a PCM sound source and others. A stopper 30 is arranged between a hammer shank 214 and a string 204 free to revolve. At the time of non string bearing mode, immediately before string beating, the hammer shank 214 makes contact with the stopper 30. Consequently, at the time of the non string beating mode, string beating sound is not generated, and only piano sound by an electronic sound source is output from a speaker 251. In the meantime, at the time of the string beating mode, the stopper 30 moves to a specified position, the hammer shank does not make contact with the stopper 30, and the hammer 215 beats the string 204.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard instrument, more specifically, by stopping rotation of a hammer immediately before striking a string,
The present invention relates to a keyboard instrument capable of preventing a stringing sound from being mixed into a piano sound produced by an electronic sound source and selectively switching between a piano sound and a stringing sound produced by the electronic sound source.

[0002]

2. Description of the Related Art Conventionally, various proposals have been made as a weak sound device for a piano. For example, JP-A-51-67732
The gazette "Grand piano weak sound device" is intended to reduce the volume of the string striking sound by reducing the speed of the hammer when striking the string. In addition, Japanese Patent Publication 1-301
In the "keyboard musical instrument" of Japanese Patent No. 55, the string striking sound is attenuated by striking the string while the damper is in contact with the string. This "keyboard musical instrument" can selectively switch between a string striking sound and an electronic sound. However, even when the electronic sound is selected, the attenuated string striking sound is mixed.

[0003]

However, in any of the above-mentioned prior arts, since the strings were hit with a hammer, the volume of the piano sound could not be sufficiently reduced. In addition, when a sound is produced by an electronic sound source, a weak string striking sound is mixed with a piano sound by the electronic sound source, so that the string striking sound is extremely annoying.

[0004]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to switch between a piano sound made by an electronic sound source and a string sound made by an acoustic piano by stopping the rotation of a hammer by hitting a key just before hitting a string according to a selection. .

[0005]

A keyboard instrument according to a first aspect of the present invention detects a string striking mechanism in which a hammer rotated by pressing a key strikes a string and a state of an operator including the key. An operator detection means for outputting a detection signal, a tone signal generation means for generating a tone signal corresponding to the detection signal, and an acoustic conversion means for generating air vibration based on the tone signal,
In the keyboard instrument having the above, it is characterized by having a stopping means for stopping the rotation of the hammer immediately before the hammer hits the string according to the selection.

[0006]

In the keyboard instrument according to the first aspect of the present invention, when the player presses a key, the manipulator detection means detects a keying speed or the like and outputs a detection signal. For example, the musical tone signal generating means having a PCM sound source or the like generates a musical tone signal corresponding to the detection signal. The acoustic conversion means converts a musical sound signal into air vibration and emits a piano sound by an electronic sound source. Then, the hammer rotates in the direction of the string along with the keystroke, but when the electronic sound source is selected, the stopping means stops the rotation of the hammer immediately before the string is struck, so that no stringing sound is emitted. Therefore, it is possible to prevent an offensive sound caused by mixing the string striking sound with the piano sound generated by the electronic sound source. Moreover, since the string striking mechanism such as an action actually operates together with the keystroke, the key touch peculiar to the acoustic piano is not impaired.

Further, when the string striking mode in which the rotation of the hammer is not restrained is selected, the keyboard instrument emits a string striking sound from an ordinary acoustic piano. Therefore, at night when it is necessary to keep the piano sound low, a piano sound is emitted by an electronic sound source whose volume can be adjusted arbitrarily, while in the daytime, a normal acoustic piano tone can be obtained by striking strings. It is possible.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a keyboard instrument according to the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a keyboard musical instrument according to a first embodiment of the present invention. 201 in this figure
Is a key (operator) that constitutes the keyboard. Each key 201 is supported on a shelf plate 202 so as to be vertically swingable about a reed 203 as a fulcrum. In addition, an action (string striking mechanism) 210 is arranged above the rear end of each key 201.

This action 210 is rotatably supported by a capstan 211 which is erected on the upper surface of the rear end of the key 201, and a jack 213 which is provided above the whip pen 212 pushed up by the capstan 211. It has a hammer shank 214, a hammer 215, and the like. When the player presses the key 201, the hammer shank 214 rotates and the hammer 215 causes the string 2 to move.
It hits 04.

A stopper (stopping means) 30 is arranged between the hammer shank 214 and the string 204. As will be described later, the stopper 30 is provided with a rotatable shaft extending in the vertical direction on the paper surface, a cushion fixed to the shaft, and the like. One end of the shaft is fixed to a rotating shaft of a motor (not shown).

It is assumed that the rotation of the shaft is stopped at the position where the cushion (not shown) of the stopper 30 faces the hammer shank 214. In this case, when the hammer shank 214 rotates in the direction of the string 204 by hitting the key, the hammer shank 214 contacts the cushion of the stopper 30, and the hammer shank 214 stops immediately before the hammer 215 hits the string. Therefore, it is possible to prevent the hammer 215 from striking the strings.

A motor drive circuit 235 is connected to the motor that rotates the shaft of the stopper 30. The motor drive circuit 235 applies an output signal corresponding to the operation of the switch 220 to the motor to rotate the stopper 30 to a predetermined position.

The switch 220 is a mode for producing a piano sound by striking a string (hereinafter referred to as a string striking mode), or
This is for selecting one of the modes in which an electronic sound source is produced without striking a string (hereinafter referred to as a non-striking mode). The signal output from the switch 220 is input to the control means 70 arranged inside the piano.

A key sensor 230 (operator detection means) for detecting the key 201 that has been tapped and the key tapping speed is disposed below each of the keys 201. These key sensors 230 are used when producing a piano sound or the like by using an electronic sound source in the non-striking mode. The key sensor 230 is composed of an optical sensor such as a photo interrupter.

Note that, for example, a shutter is provided below the key 201, and four types of patterns are recorded on the surface of the shutter along the stroke direction of the key 201. Then, the keystroke speed and the string striking time may be estimated by detecting the time when each shutter passes the optical sensor at the time of keystroke. Further, for example, instead of a shutter using four types of patterns, a gray scale whose brightness continuously changes may be used to detect the amount of transmitted light. In this case, the keystroke speed and the string striking time can be detected with high accuracy. Instead of using the optical sensor as the key sensor 230, a switch having an electric contact may be used.

At the bottom of the piano, three pedals 240 (operators) are arranged. Pedal 240 is shaft 24
It is connected via 1 to a damper (not shown) arranged near the string 204. A pedal sensor (operator detection means) 242 is provided near the pedal 240. The pedal sensor 242 detects the position of each pedal 240 and outputs a predetermined signal.

The signals output from the switch 220, the key sensor 230, and the pedal sensor 242 are input to the control means 70. The control means 70 performs processing corresponding to either the string striking mode or the non-string striking mode. That is, in the string striking mode, the control means 7
0 rotates the stopper 30 to a predetermined position so that the hammer shank 214 does not contact the stopper 30 when the hammer shank 214 rotates. In the string striking mode, the control means 70 stops the operation of the circuit such as the electronic sound source, so that the sound of a normal acoustic piano is generated by the string striking.

On the other hand, in the non-striking mode, the hammer shank 214 contacts the stopper 30 immediately before striking the string.
The control means 70 rotates the stopper 30 to a predetermined position.
Further, the control unit 70 operates a circuit such as an electronic sound source to generate a signal corresponding to the signal output from the key sensor 230. Then, this signal is output from the speaker 251 or the headphone 256 via the amplifier 250 that makes the volume variable according to the volume 250a.

The amplifier 250 is composed of a power amplifier circuit or the like and amplifies the signal output from the control means 70. The speaker 251 is fixed to the piano body, and a speaker box 252 is provided on the back of the speaker 251.
Is provided. It is also possible to prepare a plurality of speakers 251 and have a so-called multi-way configuration.

A headphone jack 255 is arranged below the keyboard shelf. This headphone jack 2
When the plug of the headphone 256 is inserted into 55, the signal from the amplifier 250 is output to the headphone 256 without being output to the speaker 251. That is, when the headphones 256 are used, no sound is emitted from the speaker 251.

FIG. 2 is a perspective view showing the stopper 30 described above. The shaft 31 is made of metal such as iron and aluminum, plastic, wood, or the like. The shaft 31 has its predetermined positions 31A, 31B, 31C, 31D.
In, the low-pitch action bracket, the low and mid-pitch section split, the next high-pitch section split, and the high-pitch action bracket, respectively. The bass action bracket, the low-midtone section split portion, the next treble section split portion, and the treble action bracket are fixed to the pin plate through the action bolts at the upper portion and to the shelf plate at the lower portion through the action table. Further, one end of the shaft 31 is connected to, for example, a rotating shaft of a motor 34. The motor 34 includes, for example, a step motor,
It is possible to use an ultrasonic motor. When the ultrasonic motor is used, the rotation angle of the rotary shaft can be maintained even when the power is not applied, and the shaft 31 can be maintained without backlash.
It is possible to rotate. Further, since the ultrasonic motor rotates at a low speed without generating noise, there is an advantage that it does not hinder the performance.

Three cushion support members 32 are fixed to the peripheral surface of the shaft 31, and cushions 33 made of felt, urethane or the like are fixed to each cushion support member 32. Artificial leather or the like may be provided on the surface of the cushion 33 in order to increase durability due to contact with the shank. In the non-string striking mode, the hammer shank 214 contacts the cushion 33. Further, a cushion wire cushion 35 made of felt, urethane, or the like is arranged on the side of the shaft 31 opposite to the cushion support member 32. A damper wire contacts the cushion 35.

FIG. 4 is a view showing the stopper 30, the action 210 and the like. Stopper 3 in the string striking mode
0 is stopped at the position shown by the solid line. In this case, the hammer shank 214 rotated by keystroke does not contact the cushion 33 of the stopper 30 and the string 20
Hit 4 Therefore, the string 204 hit by the hammer 215 vibrates, and a normal acoustic piano sound is emitted.

In the non-string striking mode, the stopper 30 is stopped at the position shown by the broken line. The hammer shank 214 rotates by the keystroke operation, and the hammer 21
When the 5 reaches the vicinity of the string, the hammer shank 214 contacts the cushion 33 of the stopper 30. Therefore, it is possible to prevent the sound of string striking in the non-striking mode. In addition, in the non-striking mode, the action 210 is actually operated by the keystroke, so that the key touch is not impaired. . If the stopper 30 is rotationally fixed at an intermediate position between the string striking mode and the non-string striking mode, soft string striking is also possible. It should be noted that when the shank 214 starts to come into contact with the cushion 33 at the time of a weak hit and gradually pushes to escape, a slight click feeling called an aftertouch of the action of the grand piano is felt. Therefore,
The upright piano action provides a key touch similar to that of a grand piano action.

Incidentally, instead of the stopper 30 shown in FIG.
You may use the stopper 40 shown in FIG. Stopper 40
As shown in FIG. 3, it is provided with a long plate 41 having a predetermined length, width, and thickness extending along the keyboard arrangement direction. One surface (surface on the hammer shank side) of the long plate 41 is formed so as to be inclined by a predetermined angle so that the hammer shank comes into contact with the surface, and a cushion 43 for the hammer shank is fixed to this surface. A cushion 44 for a damper wire is fixed to the other surface of the long plate 41. One end of each of a pair of springs 45 is fixed to both ends of the long plate 41 in the longitudinal direction, and the other end is wound around a pin 46 arranged on the parent plate. Further, one end of the long plate 41 is connected via a pipe 245 to a pedal 240A arranged below the piano by a wire.
A U-shaped guide 47 is provided just below the other end of the long plate 41.
Is provided. When the performer depresses the pedal 240A, the stopper 40 moves downward. At this time, the other end of the long plate 41 is fitted into the guide 47, so that its position is fixed. Further, the pedal 240A is configured such that when the player depresses the pedal 240A and then shifts the pedal 240A laterally (moves in the horizontal direction), the depressed state is maintained.

FIG. 5 is a diagram showing the stopper 40, the action 210 and the like. In the string striking mode, the stopper 40
Has stopped at the position indicated by the solid line. By hammering, the hammer 215 rotates clockwise in the drawing to strike the string 204. In this case, the hammer shank 214 rotates together with the hammer 215, but does not contact the cushion 43 of the stopper 40. The string 204 hit by the hammer 215 vibrates, and a normal acoustic piano sound is emitted.

Further, in the non-string striking mode, the stopper 40 is stopped at the position shown by the broken line in the figure (the position below the string striking mode position). When the hammer 215 approaches the string 204 by the keystroke operation, the hammer shank 21
4 contacts the cushion 43 of the stopper 40. Therefore, in the non-string striking mode, it is possible to prevent the sound of string striking. Even in this non-stringing mode,
Since the action 210 actually operates by keystrokes, the key touch is not impaired. The stopper 40
If is fixed at a position between the string striking mode and the non-string striking mode, weak string striking is also possible.

When switching between the string striking mode and the non-string striking mode, the stoppers 30 and 40 may be moved horizontally between the hammer shank 214 and the string 204.

Subsequently, referring to FIG. 6, the control means 7
0 and the like will be described. FIG. 6 is a block diagram showing the control means 70 and the like. In this keyboard instrument, the output signals from the switch 220, the key sensor 230, and the pedal sensor 242 are input to the controller 706 via the data bus 700. The controller 706 uses the data bus 700.
String striking sound ROM 707, resonance sound ROM 708, F
DC (Controller for floppy disk drive) 70
9, a string spectrum calculation unit 712, an audio signal transmission unit 713, a resonance sound calculation unit 716, a string sound calculation unit 711, and a RAM 717.

Then, the controller 706 performs a predetermined process on the basis of the input signals from these sensors to generate a drive signal, and the drive signal is sent from the audio signal transmitting section 713 through the equalizer 719 and the amplifier 250 to the speaker 2.
It outputs to 51 and drives this.

The string striking sound ROM 707 stores the PCM data of the string striking sound recorded in advance by the sampler, or the signal mainly composed of the piano sound calculated in advance by the string spectrum calculation unit 712 as string striking sound data of 88 keys. It is a thing. The intensity of the frequency spectrum of these string striking data is determined according to the hammer speed.
In general, harmonics are emphasized when struck. It should be noted that the string striking sound calculation unit 711 can also calculate a signal according to the key depression and the hammer speed. Also, for example, a string-sounding ROM
The signal stored in 707 may be corrected by the string striking sound calculation unit 711 according to the hammer speed.

The resonance sound ROM 708 is used for the pedal sensor 24.
It is accessed when 2 is active (stepped on). The resonance sound ROM 708 stores resonance sound data for each string when a key is pressed when the loud pedal is depressed. This data is the PCM data of the resonance sound recorded by the sampler in advance, or the frequency spectrum data calculated in advance by the resonance sound calculation unit 716. As this resonance sound data, for example, 1
It is sufficiently practical to consider that the strings for up to six keys on one key resonate. The string one octave higher in the low-pitched part is not only the second harmonic but also the third harmonic,
Consider up to the 4th and 6th harmonics. No. If the pitch is higher than 13 keys, it is necessary to consider the string of the key one octave below.

The piano damper is usually 71 (6
There are 6 and 69 pieces). Furthermore, the intensity of the frequency spectrum is determined by the model and hammer speed. The resonance sound data may be stored in advance in the resonance sound ROM 708, or may be calculated by the resonance calculation unit 716, for example, and the data stored in the resonance sound ROM 708 may be recorded. The resonance sound calculation unit 716 may perform correction calculation according to the string situation.

The string spectrum calculation unit 712 may calculate the frequency spectrum in real time according to the keystrokes to generate the pronunciation data. Further, this data may be stored in the key tap sound ROM 707. As this resonance sound data, that of an acoustic piano can be measured and stored in a memory. The magnitude of this resonance sound is -10 to-compared to the keystroke sound (string striking sound).
It is about 20 dB. Further, the rising of the resonance sound is delayed by several seconds to several 100 msec. Further, the fall continues for several seconds unless the pedal is turned off. The processing when the pedal is off is performed by the pedal sensor 242 and the audio signal transmission unit 713.

The string spectrum calculation unit 712 attenuates the string striking sound according to the OFF signal from the key sensor 230 and the resonance sound according to the signal from the pedal sensor 242. However, when the loud pedal is slowly returned by the half pedal, the damping is slow according to the return speed. When the loud pedal is turned off, the dampers are tuned together and the sound is stopped. However, some players desire to adjust the low-pitched stop sound late, and therefore the following control is performed. For example, even in simultaneous stringing, there are three types of stop sounds: rapid stop, normal stop, and slow stop. Also,
In inclined stringing, control is performed so that the low tone is late and the high tone stops faster. Moreover, it makes a very slow stop when the pedal is released very slowly. That is, it is a continuous noise stop. In the so-called half pedal region, the fundamental tone and the overtone ratio may be corrected, and the higher harmonic overtone may be quickly attenuated. Further, for example, it may be configured to correct other frequency ratios such as frame noise that are generated secondarily.

The audio signal transmitting section 713 uses the RO
M707, 708 or sound signal calculation units 712, 716
After the digital filtering processing is performed on the sound data from, the D / A conversion is performed. In the digital filtering process, the vibration characteristics of the speaker 251 and the speaker box 252 are taken into consideration, and the frequency characteristics of the output sound are corrected to be flat. Note that this digital filter is not limited to the FIR type and II
It may be R type. Furthermore, it is possible to reduce quantization noise by performing oversampling digital filtering processing thereafter. After performing such processing, D / A conversion is performed, and further filtering processing by a Butterworth low-pass filter or the like is performed. As described above, the group delay characteristic can be improved by using the Butterworth type low-pass filter. Then, this signal is input to the amplifier 250. Amplifier 25
0 amplifies power and drives the speaker 251.

Further, the keyboard instrument is an FDD (floppy disk driver) 710 controlled by the FDC 709.
Is equipped with. FDD710 is M recorded on the disc
In addition to reading IDI data, it also records MIDI data on a disc. Therefore, for example, various sound source data can be input / output via the FDD, so that in the non-string-striking mode, not only piano sounds but also musical tones such as harpsichord, pipe organ, and reed instruments can be emitted.

The motor drive circuit 235 has a function of generating a signal for driving the motor 34. The motor drive circuit 235 drives the motor 34 each time the string striking mode and the non-string striking mode are switched.

The operation of the keyboard instrument thus constructed at the time of playing will be described with reference to the flow charts of FIGS.

First, the performer or the like turns on the keyboard musical instrument according to this embodiment. Then, the control means 70 causes the RAM 71 to
The mode flag stored in No. 7 is read (step S801). The mode flag is a flag indicating whether the keyboard instrument is in the string striking mode or the non-string striking mode when the power is cut off.

When the mode flag indicates the string striking mode (YES in step S802), the motor drive circuit 235 outputs a predetermined signal to the motor 34 to rotate the stopper 30 (step S806). Therefore, the stopper 30 stops at the position shown by the solid line in FIG. When the player taps the keys in this state, the hammer shank 214 rotates without contacting the stopper 30, and the hammer 215 strikes the string 204. Therefore, a normal acoustic piano sound is emitted.

Then, when it is necessary to play with a weak sound at night, or when playing with a musical sound other than the piano sound, the player operates the switch 220 (YES in step S807). When the non-string striking mode is selected as a result of the operation of the switch 220 (step S8)
If NO in 02), the process proceeds to step S803. That is, the motor drive circuit 235 sends a predetermined signal to the motor 34 to rotate the stopper 30 (step S80).
3). The stopper 30 moves to the position shown by the broken line in FIG. At the same time, the mode flag is rewritten to the non-string striking mode.

When the player strikes a key in the non-string-striking mode, the hammer shank 214 contacts the stopper 30 immediately before the hammer 215 strikes the string, so that no string-striking sound is emitted. Then, at the same time as the keystroke, the musical sound by the electronic sound source is emitted from the speaker 251 according to the sound generation process of step S804. Even in the non-stringing mode,
The key touch peculiar to the acoustic piano is not impaired because the action actually operates by keystrokes. As long as the player does not operate the switch 220, the non-striking mode does not change (NO in step S805), and the tone generation processing by the electronic sound source is performed by keystroke (step S804).

When the player again desires the tone color of the acoustic piano, he operates the switch 220 (YES in step S805). When the string striking mode is selected (YES in step S802), the mode flag is rewritten, and step S806 is executed.

In this way, either the keystroke mode or the non-keystroke mode is selected by the player's selection, and the process according to the selected mode is performed.

FIG. 8 is a flow chart showing the tone generation processing subroutine of step S804.

In the non-string-striking mode, when the player strikes a key, the key sensor 230 detects the key number, the key-stroke speed, etc., and outputs a key sense signal. This key sense signal is sent to the controller 706 via the data bus 700.
Is input (step S901). Next, it is determined whether or not the player has operated the loud pedal (step S902). If there is no operation (depression), the string-sound-tone signal corresponding to the keystroke is read from the string-sound-sound ROM 707, or a predetermined calculation is performed by the string spectrum calculator 712 (step S903).

Then, the output timing control process for the string striking sound signal is performed (step S904). For example, according to a look-up table that defines mutual relationships such as key numbers, hammer speeds, and sounding times, an appropriate sounding time is calculated corresponding to the detected key number and hammer speed, and sounding timing is adjusted.

Further, at the sounding timing calculated in this way, the key tapping sound signal (sounding signal) is output to the speaker 251 (step S905). As a result, the speaker 25
Piano sound or other musical sound is emitted from 1. Then, the process returns to step S805 in FIG.

On the other hand, if the loud pedal is operated in step S902 (YES in step S902).
S) Further, it is determined whether or not the loud pedal is depressed (step S906). If the key is depressed, the string-sounding signal is obtained by reading the keying-sound signal corresponding to the key-striking or calculating the string spectrum in the same manner as described above (step S907). In addition, the resonance sound R of the resonance sound signal
Reading from the OM 708 or resonance sound calculation unit 71
In 6, the resonance signal is calculated (step S90).
8). Then, a signal output timing control process is performed to calculate the output timing of the string striking sound signal and the output timing of the resonance sound signal (step S909). By the signal output process (step S905), a keystroke sound is output to the speaker 251 at a predetermined timing so that a resonance sound is generated with a delay of a predetermined time. Then, step S8 of FIG.
Return to 05.

If it is determined in step S906 that the loud pedal has not been depressed (pedal release), damping noise reduction processing is performed (step S910), and a signal is output. Depending on the release speed of the loud pedal, for example, any one of the three types of simultaneous stringing, inclined stringing, and extremely slow noise stop described above is selected to stop the sound.
The attenuation here is realized by a predetermined attenuation time correction process for the calculated resonance sound signal.

Therefore, as described above, according to the keyboard musical instrument of this embodiment, in the non-string striking mode,
Since the hammer 215 stops just before striking the strings, no striking sound is emitted. Therefore, since only the piano generated by the electronic sound source is emitted, it is possible to prevent the string striking sound from interfering with the musical sound generated by the electronic sound source. Therefore, the piano sound can be set to an arbitrary volume by changing the volume of the piano sound produced by the electronic sound source. For example, at night, etc., the speaker 25
By adjusting the volume emitted from No. 1 with the volume 250a or the like, the volume can be sufficiently attenuated. Further, when the headphones 256 are used, it is possible to prevent the performance sound from leaking to the outside.

Further, in the non-string-striking mode, since the action actually operates by hitting the key, there is an advantage that the key touch is not impaired. In the string striking mode, the stopper 30 moves to a position where it does not hinder the rotation of the hammer shank 214, so that the keyboard instrument can be used like an ordinary acoustic piano.

In the non-string striking mode, instead of using the speaker 251, the soundboard of the piano may be directly vibrated by an actuator of variable excitation energy. In this case, since the sound board vibrates, it is possible to obtain a realistic acoustic piano sound.

FIG. 9 is a diagram showing a stopper 90 and an action 210A of a keyboard instrument according to the third embodiment of the present invention. A rail 217A having a substantially U-shaped cross section is bridged between the bass action bracket and the treble action bracket 217. On this rail 217A, a hammer sensor 972 for detecting the speed of the hammer shank 214 is provided for each hammer shank. The hammer sensor 972 is composed of a photo interrupter including a light emitting element such as an LED and a light receiving element such as a phototransistor. A detected part 970 is attached to the hammer shank 214.
0 has a slit 971. As the hammer shank 214 rotates, the detected part 970 crosses the optical path between the light emitting element and the light receiving element of the hammer sensor 972. At this time, the hammer sensor 972 is repeatedly turned on and off. Therefore, for example, the speed of the hammer can be detected based on the time from when the hammer sensor 972 is turned off to when it is turned on.

A stopper 90 is provided above the catcher 216. The topper 90 has an elongated shape and extends from the low tone side action to the high tone side action. As shown in FIGS. 10 and 11, the stopper 90 includes a shaft portion 901, a base 902, a cushion 903, and a protective material 904. Shaft 90
Reference numeral 1 denotes a rod-shaped member, and it is preferable to use a member having sufficient strength such as wood, metal or resin so as not to be easily bent when it collides with the catcher 216. A base 902 is arranged on the shaft 901 along the longitudinal direction of the base 902.
A cushion 903 made of urethane or the like is fixed to 02. Further, the surface of the cushion 903 is covered with a protective material 904 such as exaine, and the catcher 216 abuts on the protective material 903. Also, stand 9
02, the cushion 903, and the protective material 904 include a shaft portion 901.
Is divided into a plurality of parts in the longitudinal direction corresponding to the action split portion.

As shown in FIG. 10, the shaft portion 901 is rotatably supported by the bearing 920, and the bearing 902 is attached to the side wall of the action bracket 217 on the low sound side via the L-shaped metal fitting 921. . Similarly, the other end of the shaft portion 901 is also supported by a bearing attached to the high-pitched action bracket.

A rectangular long plate-shaped lever 910 is fixed to one end of the shaft portion 901 shown in FIG. Lever 910
A circular hole 911 is formed in this hole, and one end of a spring 930 is locked in this hole 911. The other end of the spring 930 is attached to the keyboard instrument body by a wood screw (heaton) 935 with a hole, and the lever 910 is in a state of being biased in a direction in which the spring 930 contracts. Also, the lever 91
A cutout 912 is formed at 0, and the inner surface thereof is covered with a covering portion 913 such as felt. As a result, sliding noise generated between the trap work 945 and the notch 912 can be reduced.

One end of a rod-shaped trap work 945 is locked in the notch 912.
When the lever 45 moves up and down, the lever 910 moves the shaft 901.
It is configured to rotate around. The other end of the trap work 945 is locked to the link 951, and the link 950 is connected to the trap work 955, the link 960, the trap work 965, and the pedal 240A.
The links 950 and 960 are L-shaped, and each has a shaft 95.
It is configured to be rotatable around 1,961.

When the player depresses the pedal 240A downward, the trap work 965 is pulled down, and the link 960 rotates counterclockwise about the shaft 961. Then, the rotational movement of the link 960 is transmitted to the trap work 945 via the trap work 955 and the link 950, and the trap work 945 moves downward. As a result, the lever 910 rotates around the shaft 901, the cushion 903 and the like disposed on the shaft 901 face downward (the position shown by the solid line in FIG. 9), and the keyboard instrument is in the non-stringing mode. It becomes the state of. Note that the user can
This state can be maintained by moving A to the left.

When the user lifts the pedal 240A upward, the links 950 and 960 rotate clockwise and the trap work 945 is lifted upward. Then, the elastic force of the spring 930 causes the lever 910 to move the shaft 9
It rotates in the direction of the spring 930 about 01. As a result, the cushion 903 disposed on the shaft portion 901 is oriented in the lateral direction (the position shown by the broken line in FIG. 9), and the keyboard instrument is in the string striking mode.

The operation of the keyboard musical instrument according to this embodiment having the above structure will be described with reference to FIG. In the action shown in FIG. 9, in the non-string striking mode (silence) (when the stopper 90 is at the position shown by the solid line),
When the performer hits the key, the capstan 211 is the wippen 2
12, the hammer shank 214 is rotated.
However, immediately before the hammer 215 hits the string 204, the catcher 216 causes the protector 904 of the stopper 90 to move.
The hammer shank 214 stops at the position indicated by the broken line in the figure. Therefore, the electronic piano sound is produced without hitting the strings. Further, since the action actually operates by the keystroke, it is possible to prevent the key touch from being impaired. Further, since the hammer shank 214 is prevented from rotating right above the catcher 216, it is possible to reliably prevent the keystroke.

In the string striking mode (when the stopper 90 is in the position shown by the broken line), the catcher 215
Does not come into contact with the stopper 90, the hammer 215 rotated by keystroke comes into contact with the strings, and a normal acoustic piano tone color is emitted.

Further, in the keyboard musical instrument according to this embodiment, the stopper 90, which is a stationary means, is attached to the catcher 21.
Since it is disposed above 6, the hammer sensor 972 can be disposed between the hammer shank 214 and the damper wire 218, or a damper wire rail (not shown) can be disposed at substantially the same position as the hammer sensor 972. That is, the function as an automatic piano and the function as a mute piano can be realized in one piano. Further, by bending the damper wire 218, the stopper 90 does not interfere with the fine adjustment of the position. Therefore, the fine adjustment of the damper wire 218 can be performed like a normal piano.

[0065]

As described above, according to the present invention, in the keyboard musical instrument in which one of the string striking sound and the electronic sound can be selected by the player's selection, the electronic sound is selected (non-string striking mode selection). At the time), the rotation of the hammer is stopped immediately before striking the strings to prevent the striking sounds from being mixed into the electronic sounds of the piano, whereby the volume of the piano sounds can be sufficiently attenuated. At this time, at the same time, since the action actually operates by keystroke, the key touch is not impaired. Further, there is an advantage that it can be used as a normal acoustic piano in the string striking mode.

[Brief description of drawings]

FIG. 1 is a sectional view of a keyboard instrument according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a stopper according to the first embodiment of the present invention.

FIG. 3 is a perspective view of a stopper according to a second embodiment of the present invention.

FIG. 4 is a side view showing a stopper and an action according to the first embodiment of the present invention.

FIG. 5 is a side view showing a stopper and an action according to the second embodiment of the present invention.

FIG. 6 is a block diagram of control means and the like according to the first exemplary embodiment of the present invention.

FIG. 7 is a flowchart showing the operation of the keyboard musical instrument according to the first embodiment of the present invention.

FIG. 8 is a flowchart showing a subroutine of a sounding process according to the first embodiment of the present invention.

FIG. 9 is a sectional view showing a stopper and an action according to the third embodiment of the present invention.

FIG. 10 is a side view of a stopper according to a third embodiment of the present invention.

FIG. 11 is a perspective view of a stopper and the like according to a third embodiment of the present invention.

[Explanation of symbols]

30, 90 ... Stopper (stopping means), 201 ... Key (operator), 210 ... Action (string striking mechanism), 230 ...
Key sensor (operator detection means), 240 ... Pedal (operator), 242 ... Pedal sensor (operator detection means),
706 ... Controller (tone signal generating means), 707.
.. String-sounding sound ROM (musical sound signal generating means), 708 ... Resonance sound ROM (musical sound signal generating means), 711 ... String-sounding sound calculation section (musical sound signal generation means), 712 ... String spectrum calculation section ( Musical sound signal generation means), 716 ... Resonance sound calculation section (musical sound signal generation means), 713 ... Audio signal transmission section (musical sound signal generation means), 251 ... Speaker (acoustic conversion means)

Claims (1)

[Claims] 1. A string striking mechanism in which a hammer rotated by depressing a key strikes a string, an operator detection unit for detecting a state of an operator including the key and outputting a detection signal, and a detection signal. A musical tone signal generating means for generating a musical tone signal corresponding to, and an acoustic converting means for generating air vibration based on the musical tone signal, in a keyboard instrument, depending on the selection, immediately before the hammer strikes the string. A keyboard instrument having a stopping means for stopping the rotation of a hammer.