JP3459844B2 - Electronic musical instrument keyboard device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard device for an electronic musical instrument which can be played by an electronic tone generator.

[0002]

2. Description of the Related Art Conventionally, various proposals have been made regarding a keyboard structure in order to reproduce the touch feeling of an acoustic piano in an electronic piano. For example, Japanese Patent Laid-Open No. 4-3
Japanese Patent No. 47895 discloses an electronic piano in which the weight of a key when pressed (hereinafter, simply referred to as a touch) is gradually reduced from a low-pitched sound side to a high-pitched sound side to provide a touch feeling closer to that of an acoustic piano. ing.

[0003]

[SUMMARY OF THE INVENTION Incidentally, in an electronic piano, base generally provided with a sensor capable of detecting a key depressing velocity per each key, to be given to the key depression speed and electronic tone
A correspondence table between Roshiti values keep the touch curve stored in the memory, a key depression speed detected by the sensor is converted into a velocity value based on the touch curve, the velocity
The electronic tone generator is controlled by the performance data including the value so that the performance sound is made more or less strong according to the key pressing speed. That is, the strength of the sound in the electronic piano is determined by the key pressing speed.

However, when the keyboard is constructed as in the prior art described above, if the strength of the sound is determined simply by the key pressing speed, the following problems occur. That is, when the touch of the key is configured to lighten gradually from the low tone side to the high tone side, the former is easier to move between the key with the lighter touch and the key with the heavier touch, and the key is pressed with the same key pressing force. A key with a light touch also has a faster key pressing speed, and even with the same key pressing force, the higher the key, the easier it is to produce a stronger sound. Therefore, regardless of the strength of the sound intended by the performer, there is a problem that the sound becomes stronger in the high frequency range.

In addition, in recent years, an electronic sound source has been incorporated into an acoustic piano, and the performance sound by striking a string can be turned off if necessary, and the performance can be switched to the electronic sound source.
A so-called mute piano is known. This type of mute piano has a touch feeling peculiar to an acoustic piano in the first place. Therefore, if the performance mechanism by the electronic sound source was made the same as that of the conventional electronic piano, again, when playing with the electronic sound source, even with the same key pressing force, a stronger sound is more likely to be produced in the higher-pitched keys. Occurs.

Therefore, the present invention provides a keyboard device for an electronic musical instrument in which the strength of the sound is balanced over all keys even if the touch of the keys is gradually lightened from the low tone side to the high tone side. With the goal.

[0007]

In order to achieve the above-mentioned object, a keyboard device for an electronic musical instrument according to a first aspect of the present invention is arranged such that, for each white key or black key, a key on the high pitch side or a key on the low pitch side of the key range. Or, a keyboard with a heavy touch in the key range, a detection means capable of detecting a key pressing speed, and a correspondence between the key pressing speed and the velocity value to be given to the electronic sound source, particularly the key on the low tone side with heavy touch or By storing a touch curve adjusted so that the same velocity value can be obtained with the same key pressing force by associating a stronger velocity value with the same key pressing speed as the key range, the touch curve is stored for each key or key range with different touch. A touch curve storage means, a touch curve selection means for selecting a touch curve corresponding to a pressed key from a plurality of touch curves stored in the touch curve storage means, and a touch curve selection means. And a control means for controlling an electronic sound source with performance data including the velocity value, based on the key pressing speed detected by the detection means, by referring to the touch curve Different keys or ranges of touch have different key pressing speeds for the same key pressing force, but the velocity value obtained from the touch curve becomes a value corresponding to the key pressing force, from the low range to the high range. The feature is that the same strength sound is produced for the same key pressing force over all keys.

In the keyboard device for an electronic musical instrument according to a second aspect of the present invention, for each white key or black key, a key is touched more heavily on the low-pitched side key or key range than on the high-pitched side key or key range, It is used to detect the key pressing speed and to convert the key pressing speed into a velocity value to be given to the electronic sound source by a predetermined calculation. Especially , the key or key range on the low tone side with heavy touch is the same. A conversion that can be converted into a strong velocity value with respect to a key pressing speed, and by the conversion, a conversion constant adjusted so that the same velocity value can be obtained with the same key pressing force is stored for each different key or key range of the touch. A constant storage means, a conversion constant selection means for selecting a conversion constant corresponding to a pressed key from a plurality of conversion constants stored in the conversion constant storage means, and a conversion selected by the conversion constant selection means. Constant and detection of the detection means By a calculation based on the key depression speed, determine the corresponding velocity value, and control means for controlling the electronic tone by performance data including the velocity values, the different key or key range of the touch,
Although the key pressing speeds are different for the same key pressing force, the velocity value converted based on the conversion constant becomes a value corresponding to the key pressing force, and is the same for all keys from the low range to the high range. It is characterized by the sound of the same strength as the key strength.

Further, as described in claim 3, in the keyboard device of the electronic musical instrument according to claim 1 or 2, the keyboard has a size, a weight, and a size of the key itself for each key or each predetermined key range. It is characterized in that the combination of balances before and after the fulcrum is changed, and the touch is different for each key or predetermined key range depending on the combination.

Further, as described in claim 4, in the keyboard device for an electronic musical instrument according to any one of claims 1 to 3, a hammer is transmitted to the keyboard by transmitting an external force applied to each key. It is characterized in that a string striking mechanism for rotating and striking a string with the hammer is connected, and a touch is different for each key or a predetermined key range depending on the string striking mechanism.

[0011]

According to the keyboard device for an electronic musical instrument according to the first aspect of the present invention, since the touch is made heavier in the low tone side key or key range than in the high tone side key or key range, the same key pressing force is applied. Even if the key is operated, the higher the key, the higher the key pressing speed. In order to deal with this, the touch curve selection means selects a touch curve stored for each key or key range with a different touch. The touch curve selected here is adjusted based on the actual measurement results for each key so that the same velocity value can be obtained with the same key pressing force. It corresponds to a strong velocity value for speed. Therefore, if you refer to the dedicated touch curves, you can obtain strong velocity values for low-pitched keys at low key pressing speeds, and conversely for high-pitched keys at high key pressing speeds but weak velocity values. Is obtained. Therefore, the velocity value obtained from the touch curve will be an appropriate value corresponding to the key pressing force, although the key pressing speed will be different for the same key pressing force, and will be the same for all keys from the low range to the high range. A sound of the same strength will be produced for the key pressing force.

Further, according to the keyboard device of the electronic musical instrument of the second aspect, similarly to the above, even if the keys are operated with the same key pressing force, the key pressing speed becomes higher for the higher tone side keys. In order to deal with this, the control unit uses the conversion constant selected by the conversion constant selection unit to convert a key with a heavier touch or a key range into a stronger velocity value for the same key pressing speed by a predetermined calculation. Here, the conversion constant is adjusted based on the actual measurement result for each key so that the same velocity value can be obtained with the same key pressing force,
Strong base for the same key-depression speed heavier key or key range of touch
It is a value that can be converted into a lossy value . Therefore, if conversion is performed using dedicated conversion constants, a low velocity key gives a low velocity and a strong velocity value , while a high tone key has a high velocity, but a weak velocity.
The velocity value is obtained. Accordingly, although made for different key-depression speeds to the same key depression force, converted Velocity
The tee value becomes an appropriate value corresponding to the key pressing force, and the sound of the same strength is produced for the same key pressing force over all keys from the low range to the high range.

Further, according to the keyboard device of the electronic musical instrument of the third aspect, the touch is different for each key or predetermined key range depending on the combination of the size and weight of the key itself and the balance before and after the fulcrum. It is suitable as a keyboard for an electronic piano. Further, according to the keyboard device of the electronic musical instrument of claim 4, by the string striking mechanism for transmitting the external force applied to each key to rotate the hammer and strike the string with the hammer,
Since the touch is different for each key or a predetermined key range, it is suitable as a so-called mute piano keyboard that can switch the performance sound by striking a string to the performance by an electronic sound source.

[0014]

Embodiments of the present invention will now be described with reference to the drawings. The keyboard 1 of the electronic piano as the first embodiment is shown in FIG.
As shown in, a key 5 swinging around the balance pin 3 as a fulcrum,
A hammer arm 9 is provided which is in contact with the upper surface of the rear end side (right side in the drawing) of the key 5 and which pivots about a fulcrum 7 as the key 5 swings.

The key 5 is made of wood like a general acoustic piano, and a hole 21 is formed at the substantially center of the key 5, and the balance pin 3 is inserted into the hole 21. A hole 23 is also formed on the front end side of the lower surface of the key 5, and a front pin 27 erected on the upper surface of the chassis 25 is inserted into the hole 23 to prevent the key 5 from rattling left and right. There is. Further, keyboard lead 11 is embedded inside the front end side (left side in the drawing) of the balance pin 3 of the key 5.

The hammer arm 9 is made of synthetic resin, has a weight 29 at its tip, and is rotatably attached to the hammer flange 31 at its rear end. A protrusion 33 is formed on the lower surface of the hammer arm 9, and the protrusion 3
3 is in contact with the upper surface of the key 5 on the rear end side. In this state, the key 5 is stationary with the front end side lifted up and the rear end side (right side in the figure) abutting against the cushion 35 due to the support position of the balance pin 3 and the weight balance before and after it. Hammer arm 9 configured in this way
Are rotated as the key 5 swings. At that time, an appropriate load is applied from the hammer arm 9 to the key 5, and the touch feeling is as if the action load in the acoustic piano is applied. A hammer stopper 37 is provided above the hammer arm 9, and the hammer arm 9 rotated up to that point comes into contact with the hammer stopper 37.
Further rotation is restricted (see the chain double-dashed line in the figure). Further, the sliding member 3 is provided between the upper surface on the rear end side of the key 5 and the protrusion 33.
The projection 33 is smoothly slid by interposing 9 to allow the hammer arm 9 to smoothly interlock with the swing of the key 5.

Here, as shown in FIG. 2, the length of each key 5 is configured such that it becomes shorter on the high tone side than on the low tone side for each white key or black key. That is, each key 5 has the same length up to the front end (lower side in the drawing) of each key 5 based on the arrangement position of the balance pin 3 (line AA in the drawing). On the other hand, the length to the rear end (upper side in the figure) of each key 5 is gradually shortened from the low tone side to the high tone side. Therefore, the weight on the rear end side of the balance pin 3 is slightly heavier for the low-pitched key 5 for each white key or black key. In addition, the hammer arm 9 shown in FIG. 1 has its mounting position moved back and forth according to the rear end position of each key 5. The hammer arm 9 itself has the same structure and the same weight as those corresponding to any of the keys 5, but the position where the load of the hammer arm 9 is applied and the balance pin 3 which is the swing fulcrum of the key 5 abuts. The distance from the position is longer on the low tone side and shorter on the higher tone side. Therefore, even when the key is depressed at the same position on the front end side of each key 5, a larger force is required on the low-pitched side to swing the key 5.
Moreover, in addition to the above, the embedded position of the keyboard lead 11 is appropriately adjusted for each key with respect to the distance from the contact position of the balance pin 3. More specifically, when the keyboard lead 11 is embedded close to the front end side (left side in the drawing) of the key 5, the moment for rotating the key 5 in the pressing direction (counterclockwise direction in the drawing) becomes the largest, and the embedded position is the balance pin. The closer to 3, the moment becomes gradually smaller, and when the embedded position is moved to the rear end side (right side in the figure) of the key 5 with respect to the balance pin 3, the key 5 rotates in the direction in which the key 5 is not pressed (clockwise direction in the figure). It will be a moment to make. Therefore, the key pressing force required to swing each key 5 is finely adjusted by the difference in the embedded position of the keyboard lead 11.

That is, in the keyboard 1 of this embodiment, the weight balance before and after the fulcrum of the key 5 itself is different, the position where the load from the hammer arm 9 is applied is different, and the keyboard lead 11 embedded in the key 5 is embedded. Key 5 due to the combined action of different positions
The touch is adjusted so that it is heavier on the bass side and lighter on the treble side, and the touch feeling peculiar to an acoustic piano is simulated.

On the lower surface of the key 5, as shown in FIG.
A printed circuit board 41 is fixed to the upper surface of the chassis 25, and a rubber switch 43 for detecting the movement of the key 5 is attached to the upper surface of the printed circuit board 41. As shown in FIG. 3, the rubber switch 43 includes two contacts S1 and S2 facing the printed board 41. The contacts S1 and S2 are supported by the cylindrical side wall portion 43a that is elastically deformed flexibly, and are normally separated from the printed circuit board 41, and the rubber switch 43 is pressed from the upper surface side in response to a key pressing operation. Only at this time, the cylindrical side wall portion 43a is elastically crushed, and the contacts S1 and S2 come into contact with the wiring pattern (not shown) on the upper surface of the printed board 41 to be in a conductive state. Since the distance between the contact S1 and the contact S2 is different from that of the printed circuit board 41 as shown in the drawing, the contact S1 and the contact S2 are different.
And the printed circuit board 41 are contacted with a certain time difference Δt.

The rubber switch 43 thus constructed is
As shown in FIG. 4, it is connected to the performance control unit 51, and the energized state is constantly monitored during performance. This performance control unit 51
A CPU 53 that executes various processes, a ROM 55 that stores a control program, a touch curve, and the like, a RAM 57 that temporarily stores data that is necessary during the process, and an energized state of the rubber switch 43 that is converted into a predetermined signal. An input interface circuit 59 for inputting, an electronic sound source 61 controlled by performance data, and a MIDI interface circuit 6 connected to an external electronic musical instrument M for transmitting and receiving performance data.
3 and the like, which are connected to each other via a bus line 65.

In this embodiment, a touch curve is set for each key 5 and stored in advance in the ROM 55. The touch curve is Velocity to be set in the touch data and the performance data representing the key depression speed of the keys 5
In the correspondence table with the tee value , for example, as shown in FIG. 5, when the horizontal axis represents touch data and the vertical axis represents velocity value , it corresponds to the 1st key, 2nd key, ..., 88th key. Then, as shown in the graphs d1, d2, ..., D88, the curves are peculiar to each key. These touch curves are adjusted based on the actual measurement results for each key so that the same velocity value can be obtained with the same key pressing force. As a result, a key with a heavier touch or a key range is stronger for the same key pressing speed. It corresponds to the velocity value . The curves shown in the graphs d1, d2, ..., D88 in FIG. 5 are merely examples, and their shapes may change depending on the difference in the operating characteristics of the keyboard and the characteristics of the sound source.

Next, performance control processing by the performance control unit 51 will be described with reference to the flowchart of FIG.
First, the performance control unit 51 detects a key depression operation by the player (S10). Here, the energized states of the rubber switches 43 arranged over all the keys (88 keys) are sequentially and periodically scanned at high speed, and the depressed key 5 is pressed.
Is detected, and at the same time, the time difference Δt from energizing the contact S1 of the rubber switch 43 corresponding to the key to energizing the contact S2 is measured. Actually, the performance control unit 51 also processes a key release operation, but since this processing is similar to that of a conventional electronic piano, the description thereof is omitted here, and only the processing related to the key pressing operation will be described below. .

Next, the key number KN representing the pitch of the depressed key and the touch data TD representing the key pressing speed are obtained from the above measurement results (S20). Here, the key number KN is
It is determined by the position of the pressed key 5. Further, the touch data TD can be obtained by converting the time difference Δt based on the correspondence table as shown in the graph of FIG. 7. The correspondence table is stored in the ROM 55 in advance, like the touch curve. In the present embodiment, the keys on the lower tone side are generally heavier to be touched. Therefore, even if the keys are pressed with the same key pressing force, the time difference Δt is larger on the lower tone side keys and the touch data TD tends to be smaller accordingly. Appears.

Next, one touch curve corresponding to the depressed key 5 is selected based on the key number KN obtained in S20 (S30). Then, based on the touch curve, touch data obtained in S20 TD Gabe Roshiti value V
(S40). In the present embodiment, the touch curve corresponding to the low-pitched key is associated with a stronger velocity value for the same touch data. Therefore, the keyboard 1 of this embodiment has the touch data T on the low tone side as described above.
D tends to be small, but the velocity value V
Tends to increase, and conversely, the touch data TD tends to increase on the treble side, but the velocity value V decreases accordingly. That is, different touch data T for the same key pressing force.
Although it becomes D, the velocity value V obtained from the touch curve becomes an appropriate value corresponding to the key pressing force, and as a result,
Sounds of the same strength will be produced for all keys from the low range to the high range for the same key pressing force.

The key number KN obtained in this way
Performance data is created using the or velocity value V (S50). In this embodiment, the format of the performance data conforms to the MIDI standard adopted by many electronic musical instruments as a unified communication standard among musical instruments.
MIDI standard performance data consists of 1 byte consisting of 1 byte of status byte and 2 bytes of data byte.
The key byte KN, the velocity value V, etc. are set in the data byte.

Then, the performance data created in S50 is transmitted to the electronic sound source 61 to perform the performance (S60). The performance data is transferred to the MIDI interface circuit 63.
It can also be transmitted to an external electronic musical instrument M via. In this case, by setting a mode selector switch or the like (not shown), the built-in electronic sound source 61 and the external electronic musical instrument M are ensembled, or the electronic sound source 61 stops playing.
It can be used simply as a keyboard for controlling the external electronic musical instrument M.

As described above, according to the electronic piano of the present embodiment, the touch of the key is gradually lightened from the low tone side to the high tone side, so that a touch feeling similar to that of the acoustic piano can be obtained. Moreover, even though the touch feeling is different between the low-pitched sound side and the high-pitched sound side, there is no difference in the strength of the sound with the same key pressing force, so the strength of the performance sound is as intended by the player. .

Also, when controlling an external electronic musical instrument, there is no concern that the strength of the sound will change depending on the range. Next, a second embodiment will be described. Note that, since the following embodiments are different from the previous embodiment only in part of the configuration, the same reference numerals are given to the same configurations, and description thereof is omitted.

As shown in FIG. 8, the electronic piano as the second embodiment is configured such that the length of the key 5 is shorter on the high tone side than on the low tone side for each predetermined key range. That is, 88 keys from the low tone side to the high tone side are divided into four groups, and the length of the key 5 is changed for each group. Since each group includes a white key and a black key, they are divided into eight groups according to the touch feeling. The structure of each key 5 is similar to that of the previous embodiment shown in FIG.

In the ROM 55 of the performance control section 51,
As shown in FIG. 9, touch curves corresponding to the above eight groups are stored. That is, the touch curves for 88 keys are stored in the previous embodiment, but the touch curves for 8 groups are stored in this embodiment. Then, the performance is performed by the same processing as that shown in FIG.

With such a configuration, it is difficult to reproduce the touch feeling that continuously and subtly changes from the low-pitched sound side to the high-pitched sound side as compared with the first embodiment, but the number of parts is reduced,
Further, since the storage capacity for storing the touch curve is significantly reduced, the cost can be reduced accordingly. Note that the number of key ranges to be divided is not limited to the above eight groups, and may be appropriately determined in consideration of improvement in touch feeling and cost reduction.

Next, a third embodiment will be described. Third
An electronic piano as an embodiment has a keyboard having the configuration shown in FIGS. 1 and 2 as in the first embodiment. That is, the length of each key 5 is configured to gradually decrease from the low tone side to the high tone side for each white key or black key.

However, unlike the first and second embodiments, the ROM 55 of the performance control section 51 has two keys for each key 5.
The conversion constants a and b set as one set are stored in advance. The conversion constants a, b is the touch data TD representing the key depression speed of each key 5 is used in converting the set all-out base Roshite <br/> I value V in the performance data, in this embodiment , V velocity value V is obtained by calculation based on the following equation.

[0034]

## EQU00001 ## V = a.times.TD + b Here, one of the conversion constants a is mainly the same velocity value for the touch data TD which has a different value for each key even with the same key pressing force due to the difference in touch. 10 is a value to be returned to, and is adjusted based on the actual measurement result for each key.
As shown in (a), when the key number KN is plotted on the abscissa and the conversion constant a is plotted on the ordinate, the curve becomes such that the conversion constant a becomes larger as the key or key range (bass side) with a heavier touch. .

On the other hand, the other conversion constant b is a value for correcting the velocity value due to the difference in the range, regardless of the adjustment of the sound intensity by the conversion constant a, and in the present embodiment. , The treble side is set to compensate for lack of sense of volume, and as shown in FIG. 10 (b), the horizontal side represents the key number KN and the vertical axis represents the conversion constant a. The curve has a larger conversion constant b. In addition to this, if the conversion constant b is appropriately adjusted, for example, it is possible to intentionally make a change in a specific range to adjust a performance sound with a characteristic,
The overall velocity value can be increased to compensate for the lack of key pressing force. These adjustments may be fixed values determined in advance, or may be variable values that can be adjusted by a switch or the like provided on the operation panel.

10A and 10B are graphs of the conversion constants a and b corresponding to the white key. The conversion constants a and b corresponding to the black key are shown in FIG. (C),
As shown in FIG. 10D, the curves are slightly different while having the same tendency as in FIGS. 10A and 10B. However, all of these graphs are merely examples, and the shape thereof may change depending on the operation characteristics of the keyboard and the characteristics of the sound source.

Next, the performance control process in this embodiment will be described with reference to the flowchart of FIG. Note that processing similar to that of the first embodiment will be briefly described. First, as in the first embodiment, the performance control unit 51 detects a key pressing operation by the player (S110), and the key number KN representing the pitch of the pressed key and the touch data TD representing the key pressing speed are obtained. Required (S120).

Next, based on the key number KN obtained in S120, a set of conversion constants a and b corresponding to the depressed key 5.
Is selected (S130). Then, the touch data TD, by calculation based on the aforementioned equation using the conversion constants a, a b, is converted to the velocity of the note value V (S14
0). In the present embodiment, as described above, the touch data TD tends to become smaller toward the lower tone side, but by the multiplication with the conversion constant a, the correction is performed so that a sound of the same strength is produced for the same key pressing force, and further the conversion constant. Addition of b also compensates for lack of volume feeling in the high frequency range.

After that, as in the first embodiment, the performance data is created using the key number KN and the velocity value V (S1).
50), the performance data is transmitted to the electronic sound source 61 to perform the performance (S160). Even with the electronic piano of this embodiment described above, a touch feeling close to that of an acoustic piano is obtained,
The same effect as that of the first embodiment is obtained in that the strength of the playing sound is as intended by the player.

In addition to this, as compared with the first embodiment in which the touch curve is stored for each key, this embodiment only needs to store two conversion constants for each key, so that the storage capacity is remarkably large. No need to create a large number of touch curves. If the conversion constant is variably adjustable, it can be adjusted according to the player's preference and key pressing force.
The strength of the playing sound can be set arbitrarily.

Next, a fourth embodiment will be described. Fourth
An electronic piano as an embodiment has a keyboard having the configuration shown in FIG. 8 as in the second embodiment. That is, the length of each key 5 is configured to be shorter for each white key or each black key, for each predetermined key range from the low tone side to the high tone side.

Also, as in the case of the third embodiment, the performance controller 5
In one ROM 55, conversion constants a and b set in pairs are stored in advance. However, unlike the third embodiment, the conversion constants a and b are set for each of the predetermined key ranges. That is, the conversion constants a and b are determined corresponding to each group of the keyboard divided into eight groups according to the difference between the white key and the black key and the four musical ranges. Then, the performance is performed by the same processing as the processing shown in FIG. If the conversion constants a and b corresponding to the white key and the conversion constants a and b corresponding to the black key are respectively graphed,
It is expressed as a step-like line as shown in FIGS.

With this structure, it is difficult to reproduce the touch feeling that continuously and subtly changes from the low-pitched sound side to the high-pitched sound side as compared with the third embodiment, but the number of keyboard parts is reduced. There are similar advantages as the second embodiment. Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modes can be adopted without departing from the scope of the present invention.

For example, in each of the above embodiments, the keyboard of the electronic piano is shown, but the present invention may be applied to the keyboard of a so-called mute piano described in the prior art. A mute piano has a touch feeling peculiar to an acoustic piano, but if the present invention is adopted, the strength of the sound with respect to the same key pressing force does not vary depending on the range even when playing with an electronic sound source. There is no sense of incongruity.

[0045]

As described above, according to the present invention, a touch feeling peculiar to an acoustic piano can be obtained, and moreover, there is no variation in the strength and weakness of the performance sound due to the difference in touch feeling.

Particularly, according to the keyboard device of the first aspect,
With a simple process of simply referring to the touch curve, it is possible to finely adjust the strength of the sound according to each key or key range.
Further, according to the keyboard device of the second aspect, as compared with the keyboard device of the first aspect, the calculation processing is increased, but since the touch curve does not have to be stored as it is, the storage capacity may be small.

In addition, the keyboard device according to the third aspect is suitable as a keyboard for an electronic piano. Further, the keyboard device according to the fourth aspect is suitable as a keyboard for a so-called muffling piano.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a structure of each key of an electronic piano of each embodiment.

FIG. 2 is a configuration diagram showing a structure of an entire keyboard of the electronic piano of the first embodiment or the third embodiment.

FIG. 3 is a cross-sectional view showing the structure of a rubber switch.

FIG. 4 is a block diagram showing a performance control unit.

FIG. 5 is a graph showing a touch curve stored for each key.

FIG. 6 is a flowchart of performance control processing according to the first or second embodiment.

FIG. 7 is a graph showing a correspondence table for obtaining touch data from key pressing time.

FIG. 8 is a configuration diagram showing a structure of an entire keyboard of an electronic piano of a second embodiment or a fourth embodiment.

FIG. 9 is a graph showing a touch curve stored for each group of predetermined keys.

FIG. 10 is a graph showing conversion constants in the third embodiment.

FIG. 11 is a flowchart of performance control processing according to the third or fourth embodiment.

FIG. 12 is a graph showing conversion constants in a fourth example.

[Explanation of symbols]

1 ... keyboard, 3 ... balance pin, 5 ... key, 7
... Support points, 9 ... Hammer arms, 21,23 ...
・ Hole, 25 ・ ・ ・ Chassis, 27 ・ ・ ・ Front pin,
29 ... weight, 31 ... hammer flange, 33 ...
・ Protrusion, 35 ... Cushion, 37 ... Hammer stopper, 39 ... Sliding member, 41 ... Printed circuit board, 43 ... Rubber switch, 51 ... Performance control section,
53 ... CPU, 55 ... ROM, 57 ... RA
M, 59 ... Input interface circuit, 61 ...
Electronic sound source, 63 ... MIDI interface circuit,
65 ... Bus line, S1, S2 ... Contact point.

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-4-347896 (JP, A) JP-A-4-172398 (JP, A) JP-A-5-73038 (JP, A) JP-A-4- 347895 (JP, A) JP 4-248594 (JP, A) JP 5-295568 (JP, A) JP 6-289867 (JP, A) JP 8-76756 (JP, A) JP-A-55-21014 (JP, A) Actual development 1-103885 (JP, U) Actual development 6-25895 (JP, U) Actual development 5-90586 (JP, U) Actual public 2-45911 (JP, Y2) Patent 2917863 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) G10H 1/34 G10B 3/12 G10H 1/053 G10H 1/18

Claims (4)

(57) [Claims] 1. For each white key or black key, a key that is touched more heavily in the low-pitched key or key range than in the high-pitched key or key region, and a detection means capable of detecting a key-pressing speed, It represents the correspondence between the key speed and the velocity value to be given to the electronic sound source, and in particular , the key or the key range on the lower tone side where the touch is heavier is associated with a stronger velocity value for the same key depression speed, so that the same key depression force is applied. A touch curve adjusted so as to obtain a velocity value is pressed from among a plurality of touch curves stored in the touch curve storage unit and a touch curve storage unit that stores each of the keys or key ranges of different touches. The touch curve selecting means for selecting the touch curve corresponding to the selected key and the touch curve selected by the touch curve selecting means, and based on the key pressing speed detected by the detecting means. And a control means for controlling the electronic sound source by the performance data including the velocity value. However, the velocity value obtained from the touch curve is a value corresponding to the key pressing force,
A keyboard device for an electronic musical instrument, which produces a sound of the same strength for the same key pressing force over all keys from the low range to the high range. 2. A white key or a black key, and a keyboard whose touch is heavier in the low tone side key or key range than the high tone side key or key range, and a detection means capable of detecting a key pressing speed, and a predetermined key. It is used to convert the key pressing speed into the velocity value to be given to the electronic sound source by the calculation of, and it is possible to convert the key or key range on the low tone side where the touch is heavy to a strong velocity value for the same key pressing speed. A conversion constant storing means for storing the conversion constant adjusted so that the same velocity value can be obtained with the same key pressing force by the conversion for each key or key range of the touch, and the conversion constant storage means. The conversion constant selecting means for selecting a conversion constant corresponding to the pressed key from the plurality of conversion constants selected, the conversion constant selected by the conversion constant selecting means, and the key pressing speed detected by the detecting means. By the operation based on And a control means for controlling the electronic sound source by the performance data including the velocity value. However, the velocity value converted based on the above conversion constant becomes a value corresponding to the key pressing force, and the same strength of sound is produced for the same key pressing force over all keys from the low range to the high range. A keyboard device for electronic musical instruments characterized by. 3. The keyboard device for an electronic musical instrument according to claim 1 or 2, wherein the keyboard has a size of a key itself for each key or a predetermined key range.
A keyboard device for an electronic musical instrument, wherein a combination of weight and balance before and after a fulcrum is changed, and a touch is different for each key or each predetermined key range depending on the combination. 4. The keyboard device for an electronic musical instrument according to claim 1, wherein an external force applied to each key is transmitted to the keyboard to rotate the hammer, and the hammer is rotated by the hammer. A keyboard device for an electronic musical instrument, wherein a string striking mechanism for striking a string is connected, and a touch is different for each key or a predetermined key range depending on the string striking mechanism.