JPH0366670B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention provides a keyboard instrument such as a piano, an organ, a reed organ, etc., with display bodies for pitch, note length, and other necessary markings, so that the performer can perform the instrument without relying on the musical score.
This is a keyboard instrument that is played with the help of this display, and when the performer does not press a key for a certain period of time during a difficult part, the automatic keying part starts playing automatically. The present invention relates to a player guidance device.

The player guidance device according to the present invention is useful for people who cannot read music scores, or those who can read music scores but are unable to match keys and notes as they wish, to play music without relying on music scores. It is.

Pianos and other keyboard instruments have long been known to have an electronic computer that stores musical scores attached to them so that they automatically play the songs stored in the storage device, but with this device, humans cannot play the piano. This is an inconvenience.

When a performer is unfamiliar with a difficult part and can identify the key to be pressed on the display, the player may not respond immediately, and if it takes too long to press the key, the player will not be able to play the song. According to the present invention, in such a case, only the parts that are difficult to play are automatically played after a certain period of time. This is accomplished by incorporating a known timer into control circuit 13. It goes without saying that the set time can be freely set by the performer according to his/her ability.

Next, an embodiment in which the player guiding device of the present invention is attached to an 88-key piano will be described.

In FIG. 1, a piano keyboard holder 25 is fixed to the main body of the piano at both ends with screws 70 or the like in order to suppress vibrations of the keys 15, 15' of the piano 10 (see FIG. 7). In the present invention, as shown _{in FIG} . (It may not be attached to the white keys 15 and black keys 15', but may be provided only to the keys necessary for the performance of the piece of music to be played). Symbols representing various symbols necessary for performance such as pace 19~
Install 24. As will be described later, the symbol bodies 17 to 24 are indicator lights, and the display bodies 16 ₁ to 16 ₈₈ are light emitting diodes a to h, respectively, and are embedded in appropriate recesses formed in the keyboard holder 25. However, display body 16 ₁
~ ₁₆₈₈ may be directly attached to the white key 15 and the black key 15' as shown in FIG. As will be described later, the musical note display bodies 16 ₁ to 16 ₈₈ are formed by integrally molding light-emitting diodes a to h arranged in the shape of a musical note in a resin molded body, and the necessary terminals are drawn out. , even if it is attached to a board with the necessary wiring as shown in Figures 2a and 2b and placed at the front opening of the keyboard holder 25, the white key 15 or the black key as shown in Figure 4. It may also be mounted in a correspondingly shaped recess provided in 15'. The display bodies 16 ₁ to 16 ₈₈ and the symbol bodies 17 to 24 may be attached to the mouthpiece located below the keyboard of the piano. The symbol bodies 17 to 24 consist of a transparent or translucent box displaying various symbols necessary for performance, and a suitable indicator light, such as a pilot lamp, provided inside the box. Symbol 19~
In this example, 24 is a symbol that represents the speed of performance of a part of a piece of music, such as Accelerando or Largando, and symbols that represent the strength or weakness of a piece of music are Piano, Mezzoforte, Fuortessimo. fortessimo) and adagio as a symbol to indicate the pace of the entire piece of music, but in addition to these symbols, various other symbols may be used depending on the type of music being played. obtain. Although only the symbol body 17 representing the crescent symbol (<) is shown in FIG. 3b, the other symbol bodies 18 to 24 may be constructed in the same manner.

In Figure 1, 11 is 1 written on the musical score.
Well-known input media such as magnetic tape, floppy disks, optical disks, magnetic cards, etc., for converting the pitch and length of a note, the strength and weakness of a musical piece, the playing speed, etc., into binary codes; 12 is an interface circuit for matching voltage levels; 13 is a computer control device; and 14 is a computer storage device. The control device 13 outputs the binary code of the note stored in the storage device 14 in response to the player's key press or depression, release of the depressed key, or automatic key press by the automatic key press after a set time has elapsed. The code information is sequentially read out from the storage device 14, and the light emitting diodes a to h of the note display bodies ₁₆₁ to ₁₆₈₈ of the note are operated as described later, and the various symbol bodies 17 to 1688 are operated.
24 blinks, and in response to the keystroke corresponding to the note, binary code information indicating the key position corresponding to the note stored in the storage device 14 is read out, and the key is pressed as described later. It is used to energize the automatic keystroke section of the

The control device 13 is a display operating unit that sequentially operates display bodies 16 ₁ to 16 ₈₈ , which will be described later, in order to instruct the player which keys to press one after another in order to play a piece of music. Display drive circuit 80
and a switch state detection circuit 90 which is a detection section,
An automatic keystroke operation section 200 and a time limit circuit 500 are formed.

The interface circuit 12, the control device 13, and the storage device 14 form an integral component of a small computer, are attached to the piano, and are connected to the
A conductor for connection to the external input medium 11 is connected from the control device 13 to the keyboard presser 2.
The connection cords to the 5 boards can be pulled out respectively.

Note that the notes of one song are usually encoded in advance and stored in a fixed storage device such as a programmable read-only memory, an electrically erasable programmable ROM, or a battery backup RAM. This is used as a storage device 14, and the control device 13 uses this fixed storage device during performance.
The performance data is displayed one after another on the display bodies 16 ₁ to 16 ₈₈
to be displayed. This storage device is attached as a memory cassette to a cassette attachment point of an operation panel of an electronic computer (into which main parts of the computer such as the control device 13 and the storage device 14 are incorporated).

A musical score representing one piece of music includes the treble clef as a note symbol, notes and rests, dotted notes, speed indicators,
Various symbols are used, such as dynamic symbols and expression markers, but the most basic of these are musical notes, which represent pitch and length. Musical notes include whole notes, half notes, quarter notes, eighth notes, 16th notes, and 32nd notes to represent the length of a sound, and these are known as ``tamajiyakushi''-shaped symbols. It is represented by. This is visually displayed by selectively causing the eight light emitting diodes a to h shown in FIG. 3a to emit light in accordance with a predetermined combination. That is, a whole note uses only light emitting diode b, a half note uses light emitting diodes b, f, a quarter note uses light emitting diodes a, f, and an eighth note uses light emitting diodes a, f, c, 16 A diacritic note is displayed by light-emitting diodes a, f, c, and d, and a 32nd note is displayed by light-emitting diodes a, f, c, d, and e, respectively. In the musical note display body 16 ₁ shown in FIGS. 3a and 6, light emitting diodes a~
h are embedded in the resin molded body according to the arrangement shown in the figure, for example, diode a has a round shape, and diode b has a ring shape around it. Other diodes c to h are similarly embedded in the resin molded body. Each light emitting diode a
The eight lead terminals from ~h and the +B voltage terminal (to be described later) are pulled out as shown in the figure and connected to the control device 13, and the diodes a to h are connected according to the binary information decoded by the control device 13. Selectively driven.
g and h are light emitting diodes representing dotted notes. In this example, there are 14 different levels of sound length, requiring 4 binary bits. Furthermore, assuming that note display bodies 16 ₁ to 16 ₈₈ are combined with each of the 88 keys,
The number of note symbols is 88, which requires 7 binary bits. In addition, symbol bodies such as the crescendo symbol 17~
Three binary bits are required to represent 24, so if you want to display the pitch, length, and presence or absence of a crescendo or other symbol for one note, you need to use the bits for one note. The number is 4+7+3=14 bits. By using these 14 bits as one block, all the data necessary for the performance of all the notes of the musical score can be recorded on the input medium. For example, in the case of magnetic tape, the aforementioned data is recorded block by block in the recording area and stored in the storage device 14 of the computer.

For example, if five notes are to be played at the same time, these notes will be displayed simultaneously on the displays ₁₆₁ to ₁₆₈₈ , so the number of required bits will be 7 x 5 + 4 + 3 = 42 bits. (In this case, the length of each note is the same). In addition, a 7-bit delimiter is added to separate one block. Therefore, these 49 bits are stored in the storage device 14 as one block.

In addition, there are 16 note indicators for all 88 keys of the piano.
It may not be necessary to provide ₁ to _{1688 bits} , and in this case the number of bits per block, and therefore the storage capacity of the storage device 14, can be reduced accordingly.

In addition, as will be described later during the performance, each time the key 15 or 15' corresponding to one note is pressed,
The light emitting diodes a to h of the symbol bodies 16 ₁ to 16 ₈₈ corresponding to the key 15 or 15' to be pressed next selectively emit light, but other symbols, such as the crescent symbol body 17, indicate a crescent. It will remain lit as long as the light is on.

In FIG. 1, 26 is a lamp indicating that the input to the storage device 14 has been completed. When the lamp 26 lights up, the performer presses the start switch 27, which activates the control device 13 in FIG. death,
The first encoded notes and symbols of the music piece, which are the stored contents, are read out from the storage device 14.
By decoding the 14 bits included in the first block, the pitch and length of the first note are determined, assuming the lowest note is the first key on the piano. Note 29 in Figure 1 is a "C" in C major, which is a quarter note, so it corresponds to the 40th key, counting from the 1st key, on a piano with 88 keys, including the black keys. This key is displayed on the display ₁₆₄₀ of FIG. 1 to represent a quarter note. This display method is illustrated in FIGS. 5a and 6. In FIG. 5a, the rightmost block is the control device 13 of FIG. 1, and 88 conductive wires are housed approximately in the center of this block, and each conductive wire is connected to a transistor associated with the note display bodies 16 ₁ to 16 ₈₈ .
It is connected to the bases of TR ₁ to TR ₈₈ as shown. The figure shows 3 of the 88 display bodies 16 ₁ to 16 ₈₈ .
Only the pieces 16 ₁ , 16 ₄₀ , 16 ₈₈ are shown. To explain only display body 16 ₁ ,
One of the 88 conductive wires at the lower end of the control device 13 is connected to the transistor TR ₁ via a diode 50 with the polarity shown.
The point between the diode 50 and the base of the transistor _TR1 is connected to the bias resistor 51.
It is connected to the conductor connecting the transistor TR ₁ and the +B power supply. This conducting wire is commonly connected to all transistors TR ₁ to TR ₈₈ as shown.

A total of 88 conductive wires located approximately in the center of the control device 13 are key position specifying portions, and a voltage is applied only to the conductive wires corresponding to the keys selected by the readout of the control device 13. For example, transistor TR ₁ conducts. On the other hand, the eight conductive wires a'-1, b'-1,...h'-1 shown in the center of the control device 13 have resistances R ₁ a,
It is connected to the display body 16 ₁ via R ₁ b, . . . R ₁ h, and forms a note length designation section. In addition, for other display bodies 16 ₂ to 16 ₈₈ , for example, display bodies 16 ₄₀ and 16 ₈₈ , eight conductive wires are connected to resistors R ₄₀ a, R ₄₀ b, . . .
Control device 1 via R ₄₀ h, R ₈₈ a, R ₈₈ b,...R ₈₈ h
Connect to the conductors a', -40 to h'-40, and a'-88 to h'-88 of No. 3. If the note being read is a quarter note,
Activate light emitting diodes a and f. In FIG. 6, the cathode sides of the light emitting diodes a to h of the musical note symbol ₁₆₄₀ are connected to the collectors of eight common-emitter transistors 41 via resistors _R40a to _R40h , respectively, and the bases of the transistors 41 are - potential is control device 1
3. The control device 13 is the symbol body 16
₄₀ is selected, a control voltage is applied from the control device 13 to the base of the transistor 41 combined with the light emitting diodes a and h. Since the transistor TR ₄₀ is conductive as described above, the conductor 16 ₄₀ connected to the transistor TR ₄₀
Only the light emitting diodes a and f leading to a' ₄₀ and f' ₄₀ emit light to indicate that it is a quarter note. Therefore, a quarter note is displayed on the display 16 ₄₀ in FIG. 1, and the player can use this display 16 ₄₀
The white key 15 corresponding to is pressed down for a time corresponding to a quarter note, for example, 1 second. Note that this pressing time is 1
It is not limited to seconds, but can be set to any suitable time desired by the performer.

Note that if this depression is not made within a predetermined set time, automatic keystroke is performed according to the present invention as will be described later.

Crescendo symbol 17, decrescendo symbol 1
8 and the other symbols 19 to 24 are formed as boxes made of transparent or translucent material containing indicator lights 46, as shown in Figure 3b. It is connected so that it lights up when it reaches 1 and turns off when it reaches 0. Therefore, the performer can appropriately change the speed and intensity of the performance according to these symbols.

Instead of displaying the shapes of musical notes using eight light-emitting diodes a to h, a combination of light-emitting diodes or lamps _D1 to _D88 , one for each key, is used as the display body 16.
₁ to 16 ₈₈ , the circuit of FIG. 5b is used in place of the circuit of FIG. 5a. Fifth
In figure b, the display bodies 16 ₁ to 16 ₈₈ consist of one light emitting diode or lamp D ₁ to D ₈₈ instead of the light emitting diodes a to h,
The anodes of D ₁ to D ₈₈ are connected to the +B power supply, the cathodes are connected to the collectors of the transistors TR' ₁ to TR' ₈₈ , and the bases of the transistors TR' ₁ to TR' ₈₈ are connected to the illustrated cathode diodes. via the terminal of the control device 13.
Each is connected to T′ ₁ to T ₈₈ separately. Control device 1
3 detects the depression of a key corresponding to a certain note in the melody section, reads the key position of the note corresponding to the next note from the storage device 14, and sets the voltage of the corresponding terminal T' _{40 to} 0V, for example. to +24V. As a result, a base voltage is applied to the base of the transistor _TR'40 , the transistor _TR'40 becomes conductive, and the light emitting diode _D40 lights up, indicating the position of the next key to be depressed. In this case, the length of the note is not displayed, but if the music is well known to the performer, the player presses the specified key for an appropriate amount of time. The control device 13 detects this depression or release of the depressed key and starts reading out the next note as described above. However, the diode can also be flashed at a specific frequency to indicate the length of the note. In this case as well, the type of note may be coded into 4 bits, and the control circuit 13 may be designed to read the coded information and blink D ₁ to D ₈₈ at different blinking cycles.

Note that if this depression is not made within a predetermined set time, automatic keystroke is performed according to the present invention as will be described later.

Referring to FIGS. 2a and 2b, the operation of the control device 13, which starts reading out the next block in response to a key depression (usually by the player), will now be described. In FIG. 2a, the white key 15 corresponding to the display ₁₆₁ is not pressed down, and the keyboard presser 25 is not pressed down.
An elastic contact conductor 43 is fixed to a board attached to the board as shown by reference numeral 42 and is located in the front part of the white key 15.
The contact 44 is normally in contact with a conductor 45 provided on the keyboard holder 25. The conductor 45 is always maintained at a ground potential corresponding to a binary "0". When the white key 15 is not pressed down, current from the +B power source flows through the conductor 45, and no current flows through the control device 13. white key 15
When pressed down, the state shown in FIG. 2b occurs, and a current corresponding to a binary "1" flows from the +B power source to the control device 13. The control device 13 immediately starts reading the next block in response to this binary signal "1". This block can contain musical notes (one note, two or more notes, five
(including cases where up to 5 notes are played simultaneously)
This block contains coded information about the key position. If the performer does not press the key displayed corresponding to the key within the set time, the automatic key press time for the key that is automatically played will be 1 second for a whole note, and 1/2 for a half note. Since a second second, a quarter note is defined as 1/4 second, etc., automatic keying is possible using the coded 4-bit and 7-bit pitches. If the key indicated in the read block is the 20th key, the control device 13 connects the control terminal T″ ₁ corresponding to that key.
~ energize control terminal T″ ₂₀ of T″ ₈₈ . control terminal
T″ ₁ to T″ ₈₈ are each drawn out from the automatic keystroke operation unit 200 of the control device 13, as shown in FIGS. 5a and 5b. Control terminals T″ ₁ to T″ ₈₈ are diodes.
For example, 24V +B power supply and transistor
It is connected to the base of TR″ ₁ ~TR″ ₈₈ , and the +B power supply is connected to the transistor TR″ ₁ ~ via the solenoid _L1 ~ _L88 .
TR″ _88. When the control terminal T″ ₂₀ is energized, the potential of the control terminal T″ ₂₀ changes from 0V to +
24V, a bias voltage is applied to the base of the transistor _TR''20 , and the solenoid _L20 generates a magnetic field by conducting the transistor _TR''20 . Therefore, in FIG. 2a, the iron core F ₂₀ pulls up the key (FIG. 2b). Although FIGS. 2a and 2b show that the iron core F is placed above the key 15 and the key 15 is pulled up, it is of course possible to place the iron core F below the key and push it up. No problem.

Solenoids L ₁ to L ₈₈ and iron cores F ₁ to _{F 88} form an automatic keying section.

Control device 1 represented as a block in FIG. 5a
3 is the display body 1 based on the read and decoded signal.
6 ₁ to 16 ₈₈ and a switch state detection circuit 90, the switch state detection circuit 90 operates the switches _S 1 to 16 ₈₈ connected to the elastic contact wires 43 of each of the display bodies 16 ₁ to 16 88. It is connected to a positive power supply of, for example, 5V via _S88 and a pull-up resistor circuit 100. When the player depresses one white key 15 or when this white key is automatically pressed due to a timeout of the time-limiting circuit 500, the switch S ₁ (consisting of a conductor 43, a contact 44 and a conductor 45 in FIG. 2a), for example, is activated. When opened, a voltage of 5V is applied to the detection circuit 90 from the positive power supply, and when the pressed white key 15 is released, the switch _S1 is closed and grounded, so this voltage decreases to 0V. In Fig. 5a, the switch _S1 opens when the key is depressed and closes when the key is released, so the voltage of the switch _S1 changes from 0V to 5V at the moment of depression and from 5V to OV at the moment of release. Each changes. Therefore, if the switch state detection circuit 90 is configured to submit a negative transition state of the signal, the display will be displayed next when the depressed key 15 is released.

Next, referring to FIG. 8, there is a system for automatically pressing a key when the key corresponding to the note indicated by the display elements ₁₆₁ to ₁₆₈₈ is not pressed down by the performer even after a certain period of time has elapsed. The time limit circuit 500 will be explained. The timer circuit 500 uses a preset counter, a monostable multivibrator, or the like, but here uses an additive/subtractor amplifier. In FIG. 8, 501 is an A/D converter, 502 is a preset counter, 503 is a rheostat, 5
04 is a Zener diode. Rheostat 5
The voltage according to the voltage division ratio set by 03 is A/
In the D converter, it is converted into a digital value and supplied to a preset counter 502 for counting. The preset counter 502 is a register.
It may also be possible to perform a subtraction operation or an integration operation. The time limit circuit 500 is combined with the automatic keying unit 200 inside the control device 13, and excites the solenoids _L1 to _L88 corresponding to the key when the count value of the preset counter 502 reaches a predetermined value. I'm starting to type the keys. That is, the control device 13 controls the display bodies 16 ₁ to 1
Simultaneously with the lighting of ₆₈₈ , the time limit circuit 500 is activated in accordance with the set value of the time setting rheostat 503 set by the performer. Assuming that the set time is _t1 , the control device 13 always checks by the switch state detection circuit 90 whether or not there is a keystroke within the time _t1 . Note that at time t ₁ , the performer uses rheostat 5.
03, it can be set freely. Control device 13
If the performer does not press the key that is lit up by the display within time _t1 , the automatic key-pressing device 200 automatically presses the key. Then control device 1
3 lights up the display corresponding to the next key to be pressed, and restarts the time _t1 at the same time as the automatic keystroke is completed.

On the other hand, if the performer presses a key that is instructed to be lit by the display within time t ₁ , the control device 13 lights up the display 16 ₁ to 16 ₈₈ corresponding to the next key to be pressed, The time t ₁ is restarted at the same time as the player completes the keystroke.

Figure 9 shows the case where no keystrokes are made by the performer during the timer activation for three consecutive note displays, and Figure 10 shows the case where the first keystroke is also displayed.
Figure 11 shows the case where all the next keystrokes are made by the performer while the timer is running. If the performer does not press a key within the first
FIG. 2 shows a case in which the player does not press a key within a set time when the first note is displayed, and the player presses a key within the set time when the next note is displayed. In each figure a,
b, c, d, e are lighting of display bodies 16 ₁ to 16 ₈₈ -
This indicates whether the light is off, whether the time limit circuit 500 is in operation or not, whether the player has pressed a key, whether there has been an automatic key press, and whether there is a switch state detection signal. Also, in Figures 9 to 12, logic 1
represents +5V DC, and logic 0 represents 0V DC.

As described above, according to the player guidance device of the present invention, when the start button is pressed, the musical notes are displayed on the display bodies 16 ₁ to 16 1 .
16 to ₈₈ , the type of note to be played and the key position are displayed along with the symbols 17 to 24, and the player presses the key for an appropriate length. If the key is not pressed within the set time of the time limit circuit 500, the control device 13 automatically activates the key press section 20.
0 to automatically press that key. Control device 1
3 detects this keystroke, reads out the coded information stored in the next block, and displays the coded information on the display bodies 16 ₁ to 1.
6 Display one of ₈₈ in correspondence with the key. In response to the player pressing or releasing the key of the note displayed in correspondence with the key, or in response to automatic key pressing due to a timeout of the timer circuit 500, the control device 13 further controls the next step. The coded information stored in the block is read. All songs are played in this way. Further, although the blocks in FIG. 13 show an example in which one block has five notes, this is just an example, and it is natural that the number of notes will increase or decrease depending on the piece of music.

In the present invention, the shapes of musical notes can also be displayed by using liquid crystals, fluorescent display tubes, etc. in place of the light emitting diodes a to h. Note that the symbol body may be attached not only to the key but also to the pedal so that operations for making or weakening the sound can be performed according to the instructions of the symbol body. In this case, it is convenient for the pedal indicator to have symbols such as "left pedal operation" and "right pedal operation" on the keyboard holder 25 near the crescendo symbol 17. The length of a note can also be indicated by the color or brightness of a single indicator light.

As mentioned above, the present invention stores the arrangement of notes for the melody part and accompaniment part of a single piece of music in the storage device of a small electronic computer in the form of a floppy disk, etc. By simply holding down the button for a specified amount of time, even fairly complex songs can be played semi-automatically.
It is very useful from the perspective of learning musical scores, as the automatic keystroke device performs keystrokes to help finish the performance of the piece.

In addition, the display body can be obtained by simply removing the keyboard holder of an existing piano and attaching a separate keyboard holder with a display corresponding to each key. It has the advantage of being able to be equipped with a player guidance device.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the entire semi-automatic performance device according to the present invention, the electronic computer part is shown as a block diagram, and FIGS. 2a and 2b are schematic connection diagrams of the keystroke detection mechanism. , FIG. 3A is a perspective view of one display body shown in FIG. 1, and FIG. 3B is a perspective view of one symbol body shown in FIG. Figure 4 is a perspective view of a part of the keyboard section showing an embodiment in which the display body is placed directly on each of the white keys and black keys of the piano, and Figures 5a and 5b show the circuit configuration for displaying the length of a note. Connection diagram,
FIG. 6 is a circuit diagram for explaining the operation of the light emitting diode of one of the displays shown in FIG. 5b, FIG.
1 is a schematic connection diagram of a time limit circuit that is a part of the control device, FIGS. 9 to 12 are time charts for explaining the operation of the time limit circuit, and FIG. 13 is an arrangement diagram of each block stored in the storage device. be. 10... Piano, 13... Control device, 14...
Storage device, 15, 15'...Key, 16 ₁ to 16 ₈₈ ...
...Display body (display device), L ₁ to _{L 88} ... Solenoid (automatic keying section), 80... Display body drive circuit (display device operation section), 90... Switch state detection circuit (detection section), S ₁ ~ _S88 ...Switch (detection section), _F1 ~ _F88 ...
...Iron core (automatic keystroke section), 200...Automatic keystroke operation section, 500...Time limit circuit.

Claims (1)

[Scope of Claims] (1) In a keyboard instrument, an indicator is combined with one key for each key required to play a predetermined piece of music, and a key is pressed down or a pressed key is released when playing the piece of music. a detecting section that detects the music; a display operating section that, in response to the detection by the detecting section, activates the display to instruct keys to be pressed one after another in order to play the music; It has an automatic keystroke section that is combined with the keys necessary for performance, and an automatic keystroke operation section that is combined with the automatic keystroke section, and the automatic keystroke operation section is configured to respond to successive depressions of keys according to instructions on the display. Therefore, when the musical piece is played, if the detection section does not detect the depression of a key according to the instruction on the display within a predetermined set time, the automatic keying section associated with the key is activated. 1. A player guidance device for a keyboard instrument, characterized in that the player is guided to press down the key. (2) A player guidance device for a keyboard instrument according to claim 1, wherein the set time is variable. (3) Each automatic keying part consists of an electromagnet, and this electromagnet has an iron core combined with one for all the keys necessary for playing a piece of music, and one each that cooperates with each iron core.
Claim 1 having two solenoids.
A player guidance device for a keyboard instrument as described in Section 1. (4) Claim 1, characterized in that the indicator is formed by a plurality of light emitting elements that are individually combined with the keys of a keyboard instrument and are configured to display musical notes by selectively lighting them up. A player guidance device for a keyboard instrument described in . (5) The player guidance device for a keyboard instrument according to claim 1, wherein the indicator is formed by a single light emitting element that is individually combined with each key of the keyboard instrument.