JP3774928B2 - Performance assist device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a performance learning apparatus for learning performance of a stringed instrument player by displaying a tablature of a stringed instrument such as a guitar as the performance progresses.
[0002]
[Prior art]
In recent karaoke apparatuses, lyrics are displayed on a television screen so that the user can sing without looking at a lyrics card or the like. However, if you try to play a musical instrument such as a guitar according to karaoke, there is no display that guides the performance of the instrument, so the performer can only play a song that is very familiar.
[0003]
[Problems to be solved by the invention]
On the other hand, to learn how to play stringed instruments such as guitars, instructional books and tablatures showing fingering are suitable, but they cannot teach according to the progress of the performance, and the performer himself can play the musical score. You must be dizzy. In addition, instructional videos and the like are popular, but have the disadvantage of slow cueing.
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a performance learning apparatus capable of teaching finger usage of a stringed instrument such as a guitar according to the progress of a song.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the invention according to claim 1, specific data storage means for storing performance data for stringed instruments in which performance parts of stringed instruments are expressed by specific data capable of specifying both pitches and strings A timing control unit that outputs a timing signal according to a set tempo; a reading unit that sequentially reads specific data from the specific data storage unit at a tempo according to the timing signal; and a tablature is displayed on the display device. The fret number is specified based on the specific data read by the reading means, and the display position of the fret number in the tablature is obtained. The A tablature display control means for displaying the fret number at a display position and a means for detecting a chord name based on the specific data read by the reading means are provided. The tablature display control means also displays the chord name. In addition, processing for changing the fret number is performed in accordance with information that clearly indicates the position of the capostat inserted in the performance data. It is characterized by that.
According to the second aspect of the present invention, the specific data storage means for storing the performance data for the stringed instrument expressing the performance part of the stringed instrument by the specific data that can specify both the pitch and the string, and the set tempo A timing control unit that outputs a corresponding timing signal, a reading unit that sequentially reads specific data from the specific data storage unit at a tempo corresponding to the timing signal, a tablature is displayed on the display device, and the reading unit reads A tab score display control means for specifying a fret number based on the specified data, obtaining a display position of the fret number in the tab score, and displaying the fret number at the determined display position; and reading by the reading means The code name is detected based on the specified data, and the code corresponding to the detected code name is And means for detecting a code form shown a finger to press down against the fingerboard to Kanade provided, the tablature display control means also displays the code form In addition, processing for changing the fret number is performed in accordance with information that clearly indicates the position of the capostat inserted in the performance data. It is characterized by that.
In the invention according to claim 3, Specific data storage means for storing performance data for a stringed instrument that expresses the performance part of the stringed instrument by specific data that can specify both the pitch and the string, a timing control unit that outputs a timing signal according to a set tempo, Reading means for sequentially reading specific data from the specific data storage means at a tempo according to the timing signal, and displaying a tablature on a display device, specifying a fret number based on the specific data read by the reading means, And a tab score display control means for obtaining a display position of the fret number in the tab score and displaying the fret number at the obtained display position, and means for detecting a chord name based on the specific data read by the reading means And an operation unit for inputting the use position of the capotast, and the tablature display control means Also displays a code name, and is carried out, the process of changing the fret number depending on the capo position input from the operating unit It is characterized by that.
In the invention according to claim 4, Specific data storage means for storing performance data for stringed instruments that expresses the performance part of the stringed instrument by specific data that can specify both the pitch and the string; a timing control unit that outputs a timing signal according to a set tempo; Reading means for sequentially reading specific data from the specific data storage means at a tempo according to the timing signal, and displaying a tablature on a display device, specifying a fret number based on the specific data read by the reading means, And the display position of the fret number in the tablature is obtained, the tablature display control means for displaying the fret number at the obtained display position, and the chord name is detected based on the specific data read by the reading means, And to play the chord corresponding to the detected chord name, it should be held against the fingerboard Means for detecting a code form shown a Operation unit for inputting the usage position of capotast The tablature display control means also displays the code form, and A process of changing the fret number is performed according to a capo last position input from the operation unit.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
A: Configuration of the embodiment
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. This embodiment is an embodiment in which the present invention is applied to a portable karaoke apparatus.
FIG. 3 is a front view showing the appearance of an embodiment of the present invention. In the figure, reference numeral 1 denotes an apparatus main body, which is provided with an operator, a display unit and the like described below on the front surface.
[0006]
First, a liquid crystal display unit 2 for performing various displays is provided at the upper front of the main body 1, and a select knob 3 for selecting music and a start / stop button 4 for instructing playback / stop of the singing accompaniment are provided below the liquid crystal display unit 2. Is provided.
[0007]
In this case, when the select knob 3 is rotated, a pulse signal is output from a rotary encoder (not shown) interlocked therewith. When the start / stop button 4 is pressed, a predetermined switch (not shown) is pressed to output a start / stop signal.
[0008]
Next, the ROM cartridge 50 has a built-in ROM that stores performance information (MIDI information), title information, tab display information (details will be described later), etc. of the song as music data. It is configured to be detachable.
40u and 40d are key switches for changing the key of each song. When the key switch 40u is pressed, the key is raised, and when the key switch 40d is pressed, the key is lowered. 41u and 41d are tempo switches for changing the tempo of each song. When the tempo switch 41u is pressed, the tempo is increased, and when the tempo switch 41d is pressed, the tempo is decreased. Reference numeral 45 is a microphone volume for adjusting the volume of the microphone, and 46 is an echo volume for adjusting the degree of the echo effect applied to the microphone signal.
[0009]
Next, PP1, PP2 and PP3 shown in FIG. 4 are external output terminals, PP1 is a video output terminal, and PP2 and PP3 are audio output terminals (left and right audio output terminals), respectively. These terminals PP1, PP2, PP3 are connected to a television 60 with a video input terminal by a connection cord.
[0010]
Next, the electrical configuration of this embodiment will be described. FIG. 1 is a block diagram showing an electrical configuration of this embodiment. In FIG. 1, reference numeral 70 denotes an operation control unit that controls each part of the apparatus in accordance with the output signals of the various buttons, keys, and switches described above. In this case, when the select knob 3 is turned and a pulse signal is output from a rotary encoder (not shown), the operation control unit 70 creates song number information according to this and sends the song number information to the data read control unit 72. Is output. In addition, the operation control unit 70 sends a control signal to the timing control unit 71 in accordance with the output signals of other keys and switches.
[0011]
Next, the data read control unit 72 reads the title information of the song corresponding to the song number information and the song numbers before and after the song number from the ROM cartridge 50, and the start / stop button 4 is pressed to start the performance. Then, the performance information of the music corresponding to the music number information, the lyrics information, and the tab display information TABS are sequentially read from the ROM cartridge 50 according to the progress of the music. The data read by the data read control unit 72 is supplied to the data separation control unit 73, where it is separated into various data. For example, lyrics information, title information, and tab display information are transferred to the video signal control unit 74, and performance information (MIDI signal) is transferred to the MIDI signal processing circuit 76.
[0012]
Here, the contents stored in the ROM cartridge 50 in this embodiment will be described. FIG. 5 is a memory map of the ROM cartridge 50. In the figure, title information for television display (codes specifying alphanumeric characters and kana / kanji) is stored for all songs in the title area A2, and title information (alphanumeric characters) for liquid crystal display is stored in the title area A3. All codes are stored for each song. In the font area A4, font data for displaying special TV title information, that is, font data not prepared in the video signal control unit 74 is stored.
[0013]
MU1, MU2, MU3,... Are music data of the first music, the second music, the third music,. Here, the music data refers to a set of performance data, lyrics information corresponding to the performance data, and tab display information TBS. The pointer area A1 stores a pointer indicating the start address of each area or song data.
[0014]
Next, the MIDI signal processing circuit 76 shown in FIG. 1 is a circuit that processes the MIDI signal supplied from the data separation control unit 73 to create a musical tone signal and outputs it to the audio signal processing circuit 77. The audio signal processing circuit 77 mixes and amplifies the audio signal input from the microphone 80 and the performance information supplied from the MIDI signal processing circuit 76, and outputs the resultant audio signal. The output signal of the audio signal processing circuit 77 is input to the audio circuit unit of the television 60 (see FIG. 4). Note that the output signal of the audio signal processing circuit 77 may be separately supplied to the audio device 81.
[0015]
On the other hand, the video signal control unit 74 processes the tab display information TAB, the lyrics information, and the title information for television display, creates an RGB signal corresponding to these, and outputs it to the video signal processing circuit 75. The video signal processing circuit 75 creates a video signal (analog signal) from the supplied RGB signals and outputs it to the television 60. Further, the video signal control unit 74 transfers the liquid crystal display title information to the liquid crystal display unit 2. The liquid crystal display unit 2 performs katakana and alphanumeric display based on the supplied title information.
[0016]
Next, the configuration of the bidet control unit 74 will be described with reference to FIG. Note that the configuration related to the processing of the title information is not related to the present invention, and thus the description thereof is omitted.
The data separation unit 90 shown in FIG. 2A classifies the supplied lyrics information for each element. Here, the lyric information is composed of text code information SDa, display position information SDb, display / erase timing information SDc, and wipe information SDd, as shown in FIG.
In this case, the text code information SDa is composed of a text code (character string) indicating lyrics having a predetermined length (a predetermined length such as one phrase or two phrases).
[0017]
Next, the display position information SDb is information indicating the display position of the character string indicated by the text code information SDa. The display position is indicated by (X, Y) coordinate data indicating the position of the origin of the character string (for example, the upper left point of the first character).
The display / erase timing information is time data indicating the display start timing and erase timing of the lyrics indicated by the text code information SDa. The wipe information is control information for painting the lyrics color according to the progress of the music, and is composed of information indicating the timing of color painting, the color painting speed, and the like.
The text code information SDa separated by the data separation unit 90 is supplied to the font data conversion unit 92, where each text code is converted into font data. The converted font data is transferred to the lyrics text bitmap control unit 91.
[0018]
The lyrics text bitmap control unit 91 displays the font data supplied from the font data conversion unit 92 based on the display / erase timing information SDc, the wipe information SDd, and the display position information SDb transferred from the data separation unit 90. . That is, the font data is arranged on the bitmap according to the display position information SDb, and the character string is developed. Then, the expanded character string is output to the video signal processing circuit 75 via the synthesis unit 98 at a timing corresponding to the display / erase timing SDc. In addition, color painting processing of the character string developed on the bitmap is performed according to the timing and speed according to the wipe information SDd. The speed of the color painting process is set according to the speed information in the wipe information and the timing signal supplied from the timing control unit 71. In this case, since the timing signal varies according to the tempo set by the tempo switches 41u and 41d, the lyrics displayed on the television 60 are colored at a speed corresponding to the tempo of the song. That is, the progress of the music matches the coloring speed.
[0019]
Next, the data separator 95 shown in FIG. 2A classifies the supplied tab display information TABS for each element. The tab display information TABS is composed of fret number information TDa, string number instruction information TDb, and display / erase timing information TDc, as shown in FIG.
[0020]
Here, the fret number information TDa is information indicating a fret number used for a guitar tablature. The tablature is a notation method in which a note is represented by a position on a fingerboard of a stringed instrument, and a fret number is written on a line corresponding to each string of the stringed instrument. FIG. 6 is a diagram for explaining the rules of tablature display in this embodiment, as shown, horizontal lines L1 to L6 corresponding to string numbers 1 to 6 and vertical lines Lv indicating bars are displayed. A fret number indicating the position of the fret is displayed overlapping the horizontal lines L1 to L6. The horizontal axis of this figure indicates the progress of time, that is, the progress direction of the music. Therefore, it is possible to know which string is played and when the fret number is displayed.
[0021]
The string number instruction information TDb indicates the number of the string to be pressed, and this string number instruction information TDb is input to the display position generation unit 99 together with the fret number information TDa. The display position generation unit 99 refers to the two pieces of input information, obtains a position where the fret number is to be displayed, and generates display position information TDd corresponding to this position. This display position information TDb indicates the display position of the fret number and, as shown in FIG. 6, indicates the (X, Y) coordinates of the television screen 60, for example, with the upper right end as the origin. The display / erase timing information is time data indicating the display start timing and the erase timing of the number indicated by the fret number information TDa.
The fret number information TDa is supplied to the image data conversion unit 96, where it is converted into image data corresponding to the fret number. The converted image data is transferred to the tab bitmap control unit 97.
[0022]
The tab bitmap control unit 97 uses the display / erasure timing information TDc transferred from the data separation unit 95 and the display position information TDd output from the display position generation unit to supply the image supplied from the image data conversion unit 96. Display data. That is, the image data is arranged on the bitmap according to the display position information TDd. At this time, the horizontal lines L1 to L6 and the bar line Lv are drawn in advance on the bitmap. Then, the font of the fret number is output to the video signal processing circuit 75 via the synthesis unit 98 at a timing corresponding to the display / erasing timing TDc.
[0023]
B: Operation of the embodiment
(1) Initial display
Next, the operation of this embodiment having the above-described configuration will be described.
First, when the power switch 37 is turned on, the data read control unit 72 reads the title information for television display with reference to the pointer in the ROM cartridge 50. Then, the video signal control unit 74 converts the title information of these songs into text codes, and further converts them into font data corresponding to these text codes. As a result, the video signal control unit 73 causes the television 60 to display a title (not shown).
[0024]
(2) Performance performance
Next, when the operator turns the select knob 3, a pulse corresponding to the rotation amount is output, and this pulse signal is supplied to the operation control unit 70. Now, assuming that the operator turns the select knob 3 to the right by one pulse, the system control unit 70 instructs the data read control unit 72 to select the next song based on the supplied pulse. Next, when any of the songs is selected and the start / stop button 4 is pressed, an ON signal is output from a switch (not shown), whereby the operation control unit 70 is sent to the data read control unit 72. Instruct the start of performance. As a result, the data read control unit 72 refers to the pointer in the ROM cartridge 50 and sequentially reads the music data of the music.
[0025]
Now, when the start / stop button 4 is pressed while the first music is selected, the music data of this music (see FIG. 5) is read out. The performance information in the music data is separated by the data separation control unit 73 and transferred to the MIDI signal processing circuit 76, where a musical sound signal is created. The musical tone signal is supplied to the television 60 via the audio signal processing circuit 77 and output from the speaker.
[0026]
When the intro performance is finished and the song portion is entered, the lyrics information in the music data is supplied to the video signal processing circuit 75. Then, the lyrics display as shown in FIG. 7 is performed on the screen of the television 60, and the lyrics text bitmap control 91 paints the characters of the lyrics based on the wipe information. In other words, in the example shown in FIG. 7, the lyrics of “Hello Darkness my old Friend” are displayed, and the lyrics are colored as the music progresses.
[0027]
On the other hand, the music data read from the ROM cartridge 50 includes tab display information TABS, which is separated by the data separation control unit 73 and supplied to the data separation unit 95 shown in FIG. The data separation unit 95 outputs fret number data, display / erase timing data, and display position information generated from the fret number data and string number data. The tab bitmap control unit 97 outputs these data. An image for display corresponding to is generated. As a result, tab display as shown in the middle of FIG. 7 is performed.
[0028]
Further, the tab bitmap control unit 97 in this embodiment detects note information (pitch) from the fret number data and display position information, and determines a chord (chord) from the detected note information. The chord is determined based on, for example, note information appearing between 1 bar and 1/2 bar. Note that an algorithm for detecting a chord from note information is well known in electronic musical instruments and the like, and thus the description thereof is omitted. Then, the tab bitmap control unit 97 reads the image data corresponding to the determined chord from the image data conversion unit 96 and sends it to the synthesis unit 98. As a result, the code name is displayed in the upper part of the television screen 60 as shown in FIG.
The tab display, code name display, and lyrics display as described above are performed based on the music data that is read in accordance with the progress of the music, and are accordingly updated as the music progresses.
[0029]
C: Modification
In the above-described embodiment, the following various modifications are possible.
(1) Instead of the string number instruction information included in the tab display information TAB, display position information for directly specifying the position for displaying the fret number data is used.
In this case, the display position generation unit for generating the display position information from the fret number data and the string number instruction data can be omitted. However, the coordinate processing of the display position from the string number instruction data is required when data is stored in the ROM cartridge 50, the configuration of the display unit is fixed, and the versatility is lowered from the viewpoint of data utilization.
[0030]
In addition, a stringed instrument such as a guitar with a fret can be played with a uniform pitch by using capotast, but the fret number in this case is Generally, it is counted from the position of the capotast. Therefore, in a song that is easier to play using capotast, information that clearly indicates the fret position of the capotast may be inserted into the performance data, and processing for changing the fret number based on the information may be performed. Further, the use position of capotast may be displayed on the television screen 60.
[0031]
In addition, an operation unit for inputting the use position of the capotast may be provided, and the fret number changing process may be performed according to the capotast position input by the operation unit. In this case, even if a capo paste is attached to a favorite position of the performer, a tablature display corresponding to this can be performed by inputting the position.
[0032]
(2) In the embodiment described above, the chord name is detected from the tab display information TABS. However, the chord name may be included in the performance data in advance as individual data.
[0033]
(3) After detecting the code name from the tab display information TABS, the code form may be detected and displayed. Note that the chord form indicates a finger to be pressed against the fingerboard of the guitar in order to play the chord, for example, as shown in FIG. 8B.
By the way, even if it is the same chord, there are several positions, but if a position corresponding to the note information detected from the tab display data TABS is displayed, a chord form matched to the tune can be displayed. .
Furthermore, as a result of performing the tablature display based on the tab display information TABS, as shown in FIG. 8A, there may be a display in which all six strings are played simultaneously. This is a case where a performance called a chord stroke is shown. In such a performance, the display of the chord form as shown in FIG. 8A shows a tablature when a chord stroke performance of chord F is performed, and FIG. 8B shows a chord form of chord F. FIG.
[0034]
{Circle around (4)} If the musical piece is only a performance (instrumental), there is no need to display the lyrics, so only the tablature should be displayed on the display surface. In this case, information indicating whether it is instrumental or not is included in the performance data, and the display may be switched by detecting this information.
[0035]
(5) In the above-described embodiment, the performance is performed based on the performance data. Therefore, if only the fret number is displayed on the tablature, the sound length can be recognized by the ear even without displaying the note length. There is no hindrance. However, the note length may also be displayed if necessary. In this case, if data indicating the mark length is included in the TAB display information in advance, display control based on the data can be performed. For example, as shown in FIG. 2C, code length data may be stored together with fret number data, and image data corresponding to these data may be selected. FIG. 9 is a display example when the mark length display is performed. In this case, the image data conversion unit 96 shown in FIG. 2A stores in advance image data as shown in FIG. 9 (a combination of the note length and the fret number).
[0036]
(6) In the above embodiment, the wipe process is not performed for the display of the fret number. For example, as shown in the lower part of the screen in FIG. 6, a mark indicating the timing is displayed, and the color of this mark is changed. You may make it switch according to progress of a music. In this case, since the timing signal varies according to the tempo set by the tempo switches 41u and 41d, the mark displayed on the television 60 is colored at a speed corresponding to the tempo of the song. That is, the progress of the music matches the coloring speed. Further, the fret number itself may be wiped by the same process as described above.
[0037]
(7) The data separation unit 95 (see FIG. 2A) may be configured such that the fret number and the display position information are changed according to the key by referring to the key information.
In this case, since the code name is also changed, the code name may be changed in accordance with the key change amount.
[0038]
(8) Further, a code form table (code diagram table) of various codes that are normally used may be stored in a predetermined storage area of the ROM cartridge 50, and may be appropriately displayed according to the operator's selection.
[0039]
▲ 9 ▼ Other
・ In the tablature display, the display screen is divided into left and right, and when the performance progresses from left to right, the next performance is displayed on the left side. You may comprise so that the next performance may be displayed. Similarly, the display screen may be divided into two upper and lower stages, and when the performance moves to the other part, the next performance may be displayed on one part. In addition to the above, a display form may be adopted in which the performance is followed by scrolling the tablature.
According to the above processing, since the tablature is displayed prior to the performance, the performer can perform a pre-read and perform smoothly.
[0040]
A plurality of parts of tablature data may be prepared, and one of them may be selected on the device side. With this configuration, for example, two parts of a lead guitar and a rhythm guitar can be prepared in the same song, and one of them can be selected and displayed.
[0041]
-Although the above-mentioned embodiment was an example which displays the tablature for guitars, the present invention is not only a stringed instrument having frets such as an electric bass, ukulele, banjo, mandolin, but also a shamisen, violin, cello, viola, etc. It can also be applied to fretless stringed instruments. However, when applied to a fretless instrument, not the fret number display but the position display.
[0042]
【The invention's effect】
As described above, according to the present invention, finger usage of a stringed instrument such as a guitar can be taught in accordance with the progress of a song.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an electrical configuration of an embodiment of the present invention.
2 is a block diagram showing a configuration of a video signal control unit 74 shown in FIG.
FIG. 3 is a front view showing an appearance of the embodiment.
FIG. 4 is a connection diagram when a television is connected in the embodiment.
FIG. 5 is a memory map of the ROM cartridge 50 in the embodiment.
FIG. 6 is a diagram for explaining tab score display rules in the embodiment;
FIG. 7 is a diagram showing an example of tablature display in the embodiment.
FIG. 8 is a diagram illustrating a display example of a code form in the embodiment.
FIG. 9 is a diagram showing another example of tablature display in the embodiment.
[Explanation of symbols]
50... ROM cartridge (specific data storage means: performance data storage means) 72... Data reading control section (reading means) 76... MIDI signal processing circuit (musical sound signal generating means) 96. (Tablature display control means), 97 ...... tab bitmap control part (tablature display control means)
TDa: Fret number information (specific data), TDb: String number instruction information (specific data).

Claims (4)

Specific data storage means for storing performance data for a stringed instrument expressing a performance part of the stringed instrument by specific data that can specify both pitch and string;
A timing control unit that outputs a timing signal corresponding to the set tempo;
Reading means for sequentially reading specific data from the specific data storage means at a tempo according to the timing signal;
And displays the tablature display device, the fret number to the specified fret number based on the read specific data unit is read, and obtains the display position in the tablature the fret number was determined display position Tablature display control means for displaying,
Means for detecting a code name based on the specific data read by the reading means;
The tablature display control means also displays the chord name and performs a process of changing the fret number in accordance with information clearly indicating the position of the capo last inserted in the performance data. apparatus. Specific data storage means for storing performance data for a stringed instrument expressing a performance part of the stringed instrument by specific data that can specify both pitch and string;
A timing control unit that outputs a timing signal corresponding to the set tempo;
Reading means for sequentially reading specific data from the specific data storage means at a tempo according to the timing signal;
And displays the tablature display device, the fret number to the specified fret number based on the read specific data unit is read, and obtains the display position in the tablature the fret number was determined display position Tablature display control means for displaying,
A means for detecting a chord name based on the specific data read by the reading means and detecting a chord form indicating a finger to be pressed against the fingerboard in order to play a chord corresponding to the detected chord name; ,
The tablature display control means also displays the chord form , and performs a process of changing the fret number according to information that clearly indicates the position of the capostat inserted in the performance data. apparatus. Specific data storage means for storing performance data for a stringed instrument representing a performance part of the stringed instrument by specific data capable of specifying both pitch and string;
A timing control unit that outputs a timing signal corresponding to the set tempo;
Reading means for sequentially reading specific data from the specific data storage means at a tempo according to the timing signal;
The tablature is displayed on the display device, the fret number is specified based on the specific data read by the reading unit, the display position of the fret number in the tablature is obtained, and the fret number is determined at the obtained display position. Tablature display control means for displaying,
Means for detecting a code name based on the specific data read by the reading means;
An operation unit is provided for inputting the usage position of capotast,
The tablature display control means also displays the chord name, and performs a process of changing the fret number according to the capo last position input from the operation unit. Specific data storage means for storing performance data for a stringed instrument representing a performance part of the stringed instrument by specific data capable of specifying both pitch and string;
A timing control unit that outputs a timing signal corresponding to the set tempo;
Reading means for sequentially reading specific data from the specific data storage means at a tempo according to the timing signal;
The tablature is displayed on the display device, the fret number is specified based on the specific data read by the reading unit, the display position of the fret number in the tablature is obtained, and the fret number is determined at the obtained display position. Tablature display control means for displaying,
Means for detecting a chord name based on the specific data read by the reading means and detecting a chord form indicating a finger to be pressed against the fingerboard in order to play a chord corresponding to the detected chord name;
An operation unit is provided for inputting the usage position of capotast,
The tablature display control means also displays the chord form and performs a process of changing the fret number in accordance with the capo last position input from the operation unit.

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