JPH06318078A - Automatic scale generating device - Google Patents

Abstract

PURPOSE:To generate a sound when a player plays a musical sound which is not included in the scale of an accompaniment pattern used for an accompaniment by performing conversion so as to be equal to a sound in an accompaniment scale of the pitch before the musical sound is generated. CONSTITUTION:With an accompaniment key operated (step S20), root information on the corresponding accompaniment scale is extracted from keying information (step S21). In a next step S2, the accompaniment pattern is selected and in a step S23, an automatic accompaniment sound corresponding to the accompaniment pattern and root sound is generated. Then it is decided whether or not a melody key is pressed (steps S24 and S25) and when so, it is further decided whether or not an automatic scaling switch 4b is turned ON (step S26); when it is decided that the switch is ON, the scale conversion is performed (step S27) and the sound is generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention controls the pitch of a musical tone to be played so as to match the scale (scale) of the accompaniment part when the performer plays a melody or the like in tune with the automatic performance of the accompaniment part. Related to electronic musical instruments.

[0002]

2. Description of the Related Art Recently, some electronic musical instruments can automatically accompany various rhythm patterns based on chords (chords), and the tone of the musical tone itself is excellent. However, it is possible to play complex and expressive music.

FIG. 8 is an operational flow chart showing a general operational flow of the automatic accompaniment apparatus applied to the above electronic musical instrument. First, the accompaniment by the rhythm sound starts with the rhythm pattern designated by the performer in advance (S1). Next, the performer specifies a chord in a predetermined key range (chord key range) on the keyboard, for example, according to a simple key depression rule. On the other hand, key scanning within the code key range is performed (S2). As a result, when a key depression is detected, code judgment is performed according to the key depression instruction, and code information is output (S3). Then, according to this chord information, an automatic accompaniment by chord sounds is performed in synchronization with the above-mentioned rhythm pattern (S4), and in response thereto, the performer plays a melody or the like.

On the other hand, music of Japanese style, Kyoto style, Okinawa style, or Chinese style, which is different from the conventional western music using such a chord, can be played using automatic accompaniment. Has been done.

Originally, these musics have almost no concept of chords, but mainly melody or rhythm. To play this kind of music using the automatic accompaniment, the accompaniment is not a rhythm pattern using conventional chords, but a set of sounds with a special scale that cannot be expressed by a chord name. It is often used instead (hereinafter, in the present invention, a pattern formed by such a set of sounds is called an accomp pattern, and its scale is referred to as an accomp scale). The performer performs an ad-lib performance of a melody or the like by using a sound that matches the scale in accordance with the automatic accompaniment accompaniment pattern.

[0006]

Therefore, in order for the performer to perform such a performance, it is necessary for the performer to have a thorough knowledge of scale theory and to be familiar with ad-lib performance. It is difficult for a beginner who can not read enough to perform such a performance.

However, there has been no prior art capable of converting a musical tone such as a melody played by a player into a tone within an accompaniment scale of an accompaniment as needed. An object of the present invention is, for example, when a performer plays a musical tone that is not included in the scale of the accomp pattern used for accompaniment, before the musical tone is pronounced, its pitch is regarded as a note within the accomp scale. It's about converting to equality and making it possible to pronounce.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a performer operates a performance operation means in accordance with a first musical sound, for example, an accompaniment sound generated from a sound source means on the basis of an accompaniment pattern which is an arbitrary scale pattern. The second operation based on the pitch designated by the performance operation means in response to the performance operation.
In the electronic musical instrument system in which the musical tone, such as a melody, is sounded from the sound source means, the following scale sound converting means is provided.

That is, the same means outputs a pitch (for example, a key code value) designated by the performance operating means corresponding to the performance operation of the performer together with an arbitrary accompaniment pattern and performance operation. For example, a predetermined numerical value is subtracted from the key code value so as to match any one of the pitches of the constituent sounds of the accomp scale determined by the first musical sound to be produced, for example, the root sound corresponding to the accompaniment It is a means for converting by adding and outputting the converted key code value and the like to the sound source means.

The scale sound converting means described above can be configured to have the following scale array storing means. That is, the same means ensures that an arbitrary key code value within one octave corresponds to one of the keys of each constituent sound of the accomp scale defined by a predetermined root sound, for example, C0 sound and an arbitrary accomp pattern. , The subtraction value or addition value to be subtracted or added from the key code value,
This is means for storing arbitrary accompaniment patterns and arbitrary key codes in one octave.

In the above arrangement, the player can be provided with a selecting means for selecting one of a plurality of accomp patterns as the above-mentioned arbitrary accomp pattern. In this case, of course, the scale array storage means will store the above-mentioned subtraction value or addition value for each of the plurality of accomp patterns and for each arbitrary key code within one octave.

In the above arrangement, the sound source means for producing the first musical sound, the performance operating means, the sound source means for producing the second musical sound, and the scale sound converting means can be realized as a combination on any device. For example, they can be implemented on the same electronic musical instrument. Alternatively, they may be configured as separate devices (modules) and connected by MIDI. That is, the first tone generator module outputs the information of the root tone corresponding to the musical tone as an exclusive message to MIDI while producing the first musical tone such as an accompaniment tone. On the other hand, the performer
A performance operation is performed, for example, by the keyboard of the keyboard module in accordance with the accompaniment sound produced by the first sound source module. The keyboard module uses MIDI codes such as key codes corresponding to performance operations as key-on messages.
Output to. Then, the scale sound conversion module is M
Via the IDI, the chord information from the first tone generator module and the key code from the keyboard module are received, and the key code is converted into root note information and an accomp pattern preselected by the performer using a selection switch or the like. Based on the scale conversion. The scale-converted key code is notified to the second sound source module as a key-on message or the like via MIDI, and the second musical sound is sounded there. In addition, various combinations can be realized.

[0013]

According to the present invention, the player can perform the first operation by the performance operation means.
When a second musical tone, for example, a melody is played in accordance with the musical tone, for example, an accompaniment tone, the scale tone converting means sets the pitch of the second musical tone to the root tone corresponding to the first musical tone, for example, in advance. In order to match any of the constituent sounds of the accomp scale determined by the accomp pattern selected by the performer, for example, a key after calculation that subtracts or adds a predetermined numerical value from the key code value of the key operated The code value is output to the sound source means.

Here, the predetermined numerical value to be subtracted or added can be obtained by the scale sound converting means as follows, for example. That is, the key code difference between the root tone corresponding to the first musical tone and a predetermined root tone, for example, the C0 tone, is subtracted from the key code value of the key operated and played,
Convert the resulting key code value to be the key code value of the musical note of the same floor name within one octave.

Next, a subtraction value or an addition value corresponding to the converted key code value and arbitrary accompaniment pattern is obtained from the code scale array storage means. As described above, the performer matches the accompaniment sound, which is the first musical sound,
When playing a second musical sound, such as a melody, the performer operates a key that does not belong to the accomp scale defined by the root sound corresponding to the first musical sound and the accomp pattern specified at that time. Also, since the scale sound converting means converts the sound into a pitch equal to any of the sounds in the accomp scale, the scale sound converting means does not disturb the harmony with the accompaniment sound.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to an electronic keyboard instrument will be described below with reference to the drawings.

FIG. 1 is an operation flowchart showing the principle operation of one embodiment of the present invention. First, the accompaniment by the rhythm sound starts in the rhythm pattern designated by the player in advance (S6). Next, the performer specifies an accomp pattern in a predetermined key range (accompaniment key range) on the keyboard, for example, according to a simple key depression rule. On the other hand, key scanning within the accompaniment key range is performed at any time (S7). As a result, when a key depression is detected, the route judgment of the first sound of the accomp scale (a tonic, which will be referred to as a route in the present invention) is performed according to the key depression instruction, and the route information is determined. Is obtained (S8).

On the other hand, the accompaniment used by the performer for accompaniment
A pattern is selected in advance (S5). This accomp.
No. of scale and processing of the previous route judge (S
8) According to the accomp / scale information such as route information obtained in step 8), accomp.
Automatic pattern accompaniment is performed (S9).

In this embodiment, the following operation is performed in addition to the above operation. That is, in parallel with the above operation, scanning of the melody key range other than the accompaniment key range is performed at any time. As a result, the key depression is detected and the key information is output (above S10). Next, the route information obtained by the route judge of S8 and the scale N of the accompaniment obtained by the selection of the accompaniment pattern of S5.
o. Is determined, and if the key number determined by the above-mentioned key information does not belong to this accomp scale, the key information is converted into key information belonging to the same scale (S11). And
A melody tone is sounded according to the key information converted in this way (S12).

As described above, even if the performer randomly plays a melody or the like, it is possible to obtain a melody suitable for accompaniment in which no sound hits according to the accompaniment accompaniment.

Next, the specific structure and operation of the embodiment of the present invention will be described below. FIG. 2 is an overall configuration diagram of this embodiment.

First, a CPU (central control unit) 1 controls the entire system according to a program stored in a ROM (Read Only Memory) 2 in advance. The CPU 1 scans at regular intervals to capture the on / off operation state of the keyboard section 3 and a switch group 4 described later. As will be described later with reference to FIG. 2, the switch group 4 is provided with a mode selection switch, a tone color selection switch and other switches. A RAM (Random Access Memory) 5 is mainly used as a work area for each processing operation. CPU1
Is a tone color parameter corresponding to the operation of each switch of the switch group 4, and an accompaniment keyboard 3a of the keyboard section 3 (FIG. 3, described later).
Identify accompaniment scale information obtained from. Then, these parameters, accompaniment scale, and musical tone data such as melody and rhythm played according to them are sent to the sound source 6. The tone signal generated by the tone generator 6 is converted into an analog signal by the D / A converter 7, and is emitted as a tone such as a melody, rhythm, and accompaniment through the amplifier 8 and the speaker 9.

Next, FIG. 3 is a detailed view of the keyboard portion 3 and the switch group 4 of FIG. The keyboard part 3 has a melody keyboard 3 whose treble range is at a changeable split point.
b, the bass range is divided into the accompaniment keyboard 3a. The timbre selection switch 4c is a switch for selecting the timbre of the musical sound produced by the tone generator 6 (FIG. 2). The accomp select switch 4d is a switch for selecting an accomp pattern when performing automatic accompaniment with an accomp pattern based on a scale unique to each region, such as Japanese or Kyoto. In addition, there is a rhythm selection switch (not shown) for selecting various rhythm patterns for automatic accompaniment.
The rhythm switch 4e is a switch for switching start / stop of this rhythm performance.

The mode changeover switch 4a is a switch for changing over the performance mode. The NORMAL mode is a mode for performing a normal performance, and the AC mode is a mode for performing automatic accompaniment with the accomp pattern according to the present invention. In addition, there is an auto chord that automatically plays in a predetermined chord progression, but the description thereof will be omitted.

Next, the automatic scale switch 4b is a switch which is a feature of the present invention and operates an automatic scale operation described later. When the switch 4b is turned off and the mode selector switch 4a is set to the AC mode, when the performer plays the melody keyboard 3b, the accompaniment keyboard 3a
The chord information and the accomp select switch 4d are sounded as played. Conversely, the automatic scale switch 4b is turned on, and the mode changeover switch 4a
When is set to the automatic accompaniment mode, when the melody keyboard 3b is played, the performance by automatic scaling is performed according to the accomp and scale information selected by the accomp select switch 4d.

The accomp scale and scale conversion will be described below. FIG. 4 is an accomp scale diagram with the C sound as the root. In the figure, the numbers 0, 1, 2, and 3 in the first column are accompaniment scale numbers (No.).
In the second column, "JAPAN", "KYOTO",
"CHINA", "OKINAWA", etc. represent accomp scale names. Furthermore, each accompaniment when the root sound is C sound.
On the horizontal axis corresponding to each accomp scale name, the scale constituent sounds are the octave key name C,
The positions corresponding to C # (D ♭), D, ..., B are indicated by black circles ●. As shown in the figure, each key consists of a white key and a black key, and key numbers 0, 2, 4, and
5,7,9,11 and 1,3,6,8,10 are associated.

By the way, "JAPAN" and "KYOTO" in FIG.
, "CHINA", "OKINAWA", etc., when you play a melody etc.
The melody has a general property that it is easy to harmonize with an accomp pattern based on the accomp scale in a musical sense, while a melody not included in the accomp scale is difficult to harmonize.

Therefore, in this embodiment, when playing a melody or the like with an accompaniment pattern based on the selected accomp scale, when a note not included in the accomp scale is pressed, Accomp
It is converted and pronounced so that the pitches of the constituent notes in the scale are equal.

That is, in FIG. 4, when a key corresponding to a sound other than the black circle is pressed, the sound of the closest black circle on the low tone side, which is smaller by 1 to 3 than the key number of the key, is sounded.

Next, an example of the above scale conversion will be described. First, for example, Accomp Scale No. In the case of "JAPAN" which is 0, the G sound is emitted as it is for the key pressing of the key name G, but for the key pressing of the key name G #, the value 1 is subtracted from the key number. The sound is pronounced. Thus, the number subtracted from the key number is a numerical value of 1 to 3 in the case of the accomp scale shown in FIG. In this case, values 1 to 3 may be added, but in the present embodiment, scale conversion by subtraction is all performed in order to unify the processing.

The above is the Accomp Scale conversion, which is called automatic scaling in the present embodiment because it is performed automatically. The accompaniment described with reference to FIG.
The scale conversion is performed when the C sound is used as the root, but next, it is considered that the accomp scale conversion is applied not only when the C sound is used but also when all 12 sounds in the octave are used as the root.

Therefore, based on FIG. 4, the accomp scale array shown in FIG. 5 is created and written in the ROM 2 as array data. In the figure, the addresses on the first and second lines are key numbers (0, 1, ... 1) in one octave.
Corresponding to 1), the correspondence between the key name and the key number is the same as in the case of FIG. Here, address 0 corresponds to the route of each accomp scale. On the other hand, the Accomp Scale Nos. In the first and second columns. The relationship between and the name of the Accomp Scale is also the same as in the case of FIG.

FIG. 5 shows a pre-selected accomp scale and accompaniment keyboard 3 when the melody keyboard 3b is pressed when the automatic scaling operation according to the present embodiment is performed.
As described above, in relation to the key pressing state of a, it is an accomp. scale array table showing numerical values to be subtracted from the key number of the key pressed by the melody keyboard 3b.

Next, the principle of obtaining the above-mentioned "numerical value to be subtracted from the key number" will be described. First, when the melody keyboard 3b is pressed, the designated root number (denoted by R) on the accompaniment keyboard 3a and the melody keyboard 3
By using the key number (K) of the key pressed on b, the column position, that is, the address of the accomp scale array in FIG. 5 can be obtained by the following equation (1).

Address = MOD {(K−R), 12} ... (1) (where MOD {x, y} is a remainder operation for calculating a remainder obtained by dividing x by y.) Here, the key As shown in FIG. 9, the number K is 0, 1, 2, from the lowest note C0 note on the melody keyboard 3b to 0, the highest note C5 note in chromatic order.
The value assigned 60. In addition, the route number R is a scale C tone to B tone within one octave,
C = 0, and in the order of chromatic steps up to B, 0, 1, 2, ...
., 11 are assigned values.

In the scale conversion based on the accomp scale shown in FIG. 4, the root note is the C note, but in the actual accompaniment keyboard 3a, the root note other than the C note is also specified. It is necessary to support it. here,
Since the root number R in the equation (1) is equal to the number of half pitches based on the C sound, by subtracting this root number R from the key number K, even if different root sounds, the key pressed from the root sound Addresses will be obtained according to the number of half pitches up to the pitch name.

The Accomp scale diagram of FIG.
It is a diagram showing whether or not each key number (key name) in the octave corresponds to the constituent sound of the specified accomp scale, but in the actual melody keyboard 3b, a key is pressed within a range of several octaves. Therefore, it is necessary to be able to handle such a key depression operation. Therefore, in the formula (1), the key number of the depressed key can be made to correspond to the key number within one octave, that is, the address by dividing the above numerical value (K−R) by 12 and obtaining the remainder, A numerical value to be subtracted from the key number K can be obtained from this address.

After the address is obtained, the accomp.
The row position of the scale array is determined. The address and accompaniment scale number obtained as described above. By
It is possible to obtain a numerical value to be subtracted from the depressed key number K. An example of scale conversion based on the above equation (1) is shown below. << Example 1 >> The accomp scale "JAPAN" is selected in advance by the accomp select switch 4d (see FIG. 3).
When the output of the accompaniment keyboard 3a has the C sound as the root, the root number (R) = 0 and the accomp scale number = 0. Then, when the key pressed on the melody keyboard 3b is F4, the key number K = 53, and therefore from the equation (1), address = MOD {(K-R), 12} = MOD {(53-0), 12} = 5 is obtained.

Next, with the address 5 and the accomp scale number 0, the accomp scale array of FIG. 5 is referred to, and the numerical value 1 corresponding to the compac scale "JAPAN" is obtained. This numerical value 1 is a value that is subtracted from the key number of the key pressed on the melody keyboard 3b. In this case, F4 (K = 53) that has been pressed is K = 52, which is the value subtracted by 1. The sound, E4, is pronounced. << Example 2 >> Accomp scale "OKINAWA" was previously selected by the accomp select switch 4d, and currently accompaniment keyboard 3
When the output of a has the D sound as the root, the root number (R) = 2 and the accomp scale number = 3. Then, when the key pressed on the melody keyboard 3b is A4, the key number K = 57, and therefore from the equation (1), address = MOD {(K−R), 12} = MOD {(57-2), 12} = 7 is obtained.

Next, with the address 7 and the accomp scale number 3, the accomp scale array in FIG. 5 is referred to, and the numerical value 0 corresponding to the accomp scale "OKINAWA" is obtained. This is because the sound of the key A4 pressed on the melody keyboard 3b is the accomp scale "OKINAWA".
It means that it is a sound included in A, and the sound of A4 is pronounced as it is.

The specific operation of this embodiment centering on the scale conversion operation shown in the above example will be described with reference to FIGS.
This will be described with reference to the operation flow chart. FIG. 6 shows FIG.
5 is an operation flowchart of an overall control program executed by the CPU 1 of FIG.

First, in step S13, it is determined whether or not the start switch of the rhythm switch 4e (see FIG. 3) is turned on. If the determination is YES, in the next step S15, a rhythm selection switch (not shown) is scanned, and the selected rhythm pattern is generated in step S16.

The above is the flow for the rhythm selection switch, but the following steps S17 to S23 are the flow for the accompaniment keyboard 3a. First, in step S17, it is determined whether or not the AC mode (auto accompaniment mode) is turned on by the mode changeover switch 4a of FIG. If the determination is YES, the accompaniment keyboard 3a (FIG. 3) is scanned in the next step S18, and the process proceeds to the next step S20.

At step S20, the accompaniment keyboard 3a is turned on.
It is determined whether or not the key has been pressed. The judgment is YES
Then, in the next step S21, from the key depression information of the key of the accompaniment keyboard 3a, for example, the key of C3, by the route judge program stored in the CPU 1, the route information of the corresponding accomp scale (route number R). Is obtained.

Then, in step S22, the accompaniment selection switch 4d is scanned, and in the next step S23, the accompaniment pattern "JAPAN" having the route C3, for example, is automatically accompanied.

On the other hand, in step S20, the determination is NO.
If so, the accompaniment keyboard 3a has not been depressed and the process proceeds to the next step S24. Melody keyboard 3b after step S24
Processing.

First, in step S24, the melody keyboard 3b
Is scanned, and in the next step S25, it is determined whether or not the melody keyboard 3b is turned on. If the determination is NO, the process returns to step S13 and the above-described operation is repeated. If the determination is YES, in the next step S26, the automatic scaling switch 4b (FIG. 3) is turned off.
It is determined whether or not N is set. If the determination is NO, automatic scaling is not performed on the played melody or the like, and the process proceeds to the next step S27. If step S
If the determination in 25 is YES, scale conversion described below is performed in step S27, and the process proceeds to step S28.

In step S28, the sound corresponding to the key number of the key is sounded, but if the pressed key corresponds to the above-mentioned black circle, it is sounded as it is. If it does not correspond to a black circle, the scale is converted and
The key numbers are shifted by three notes and pronounced. In either case, the process then returns to step S13 and step S13.
Similar to the case of 25, the operations of steps S13 to S28 (S25) are repeated, but when the determination of step S13 changes to NO,
In that case, it means that the rhythm start / stop switch 4e is stopped, and the rhythm performance is stopped in the next step S14. If the determination in step S17 changes to NO, it means that the mode has been switched to NORMAL mode, and the automatic accompaniment is stopped in step S19. Then, the normal performance is started, and the process proceeds to step S24.

In step S24, the melody keyboard 3b
If the pronunciation of is performed polyphonically, the processes of steps S24 to S28 are performed on all the obtained key depression information.

Next, the scale conversion in step S27 will be described. FIG. 7 is an operation flowchart regarding the scale conversion operation executed in the CPU 1.

First, in step S29, the above (1)
Expression, address = MOD {(K−R), 12} ... (1) is calculated. This specific example has already been described.

Next, in step S30, the corresponding accomp scale is stored in the ROM 2 of FIG. 2 according to the accomp scale number corresponding to the accomp scale selected by the accomp select switch 4d. Selected from accomp scale array.

Next, in step S31, the array data on the selected accomp scale is referred to by the address obtained in step S29, and the "numerical value to be subtracted from the key number" is obtained.

Further, in the next step S32, the "numerical value to be subtracted" of the array data is subtracted from the key number of the key pressed on the melody keyboard 3b. The value thus obtained is used as a new key number after scale conversion.

As described above in detail, the melody keyboard 3b
It is determined whether or not the key pressed in step 1 corresponds to the constituent sound in the accomp scale used at that time.If not, another adjacent note in the accomp scale is pronounced. It

In the above embodiment, Asian music without chords such as "Japanese style" and "Okinawa style" was taken up, but accompaniment using accompaniment patterns is not limited to these.

For example, music such as blues and gypsy is
Although it has its own scale and chord, the accompaniment by the above-mentioned accompaniment pattern can be used for such music. That is, the chord and accompaniment pattern are used properly according to the musical composition, or the accompaniment
The automatic accompaniment to which the present invention is applied can be performed by using a chord composed of sounds in the scale.

In addition, the above embodiment is an example in which the present invention is applied to an electronic keyboard instrument, but the present invention is widely applied to electronic wind instruments,
It is applicable to electronic stringed instruments and the like. The present invention can also be applied to a case where the scale information of the accomp or the like is stored in a memory or the like and the player is allowed to perform the melody while reproducing the scale information.

[0059]

According to the present invention, in an electronic musical instrument system having an accompaniment function or the like, what kind of performer is performed by the scale sound converting means using the accomp / scale array storing means or the like stored in the ROM or the like. Even when a performance is performed, a musical tone such as a melody that matches the accompaniment scale used at that time and an accompaniment pattern based on the scale can be obtained.

Therefore, for example, the performer performs an accompaniment operation with an accompaniment keyboard or the like after designating an accompaniment pattern with a rich local color such as Kyoto or Okinawa.
Data for accompaniment can be read from a pre-stored ROM for automatic accompaniment, and the player can freely play melodies and the like, so that even beginners can play music with beautiful harmony. Become.

[Brief description of drawings]

FIG. 1 is an operation flowchart showing the principle operation of one embodiment of the present invention.

FIG. 2 is an overall configuration diagram of an embodiment of the present invention.

FIG. 3 is a detailed view of a keyboard section and a switch section.

FIG. 4 is an accomp scale diagram.

FIG. 5 is an accomp scale array diagram.

FIG. 6 is an operation flowchart of one embodiment of the present invention.

FIG. 7 is an operation flowchart regarding scale conversion.

FIG. 8 is an operation flowchart of a conventional automatic accompaniment apparatus.

[Explanation of symbols]

 1 CPU 2 ROM 3 Keyboard Walk 4 Switch Group 5 RAM 6 Sound Source 7 D / A Converter 8 Amplifier 9 Speaker

Claims (4)

[Claims] 1. A performer performs a performance operation by the performance operation means in accordance with a first musical sound produced from the sound source means based on an accompaniment pattern which is an arbitrary scale pattern, and the performance is correspondingly performed. In an electronic musical instrument system in which a second tone based on a pitch designated by the operating means is sounded from the sound source means, the pitch designated by the performance operating means corresponds to the performance operation, and the pitch is the above-mentioned. The conversion is performed so as to match with any one of the pitches of the constituent sounds of the accomp scale defined by the arbitrary accompaniment pattern and the root note corresponding to the first musical sound produced together with the playing operation, An automatic scale generator having scale sound conversion means for notifying a sound source means. 2. A player performs a performance operation by the performance operation means in accordance with a first musical sound produced by the sound source means based on an arbitrary accompaniment pattern, and is designated by the performance operation means correspondingly. Second based on key code value
In the electronic musical instrument system in which the musical tone sound is generated from the sound source means, the key code value corresponding to the performance operation is designated by the performance operation means, and the key code value corresponds to the arbitrary accompaniment pattern and the performance. In order to match any of the keys of the constituent sounds of the accomp scale defined by the root sound corresponding to the first musical sound produced with the operation,
An automatic scale generating apparatus comprising scale sound converting means for subtracting or adding a predetermined numerical value and notifying the sound source means of the key code value after the calculation. 3. The scale tone converting means is configured such that an arbitrary key code value in one octave is determined by a predetermined root tone and the arbitrary accomp pattern.
The subtraction value or addition value to be subtracted or added from the key code value so as to match with any one of the keys of each constituent sound of the scale is set to the arbitrary accompaniment pattern and the arbitrary key code in the one octave. A scale array storage unit for storing each value, wherein the scale sound conversion unit produces a sound together with the performance operation from a key code value designated by the performance operation unit corresponding to the performance operation. The key code difference of the root tone corresponding to the musical tone of the above with respect to the predetermined root tone is subtracted, the key code value obtained as a result of the subtraction is converted into the key code value of the musical tone of the same rank within one octave, and the conversion is performed. A subtraction value or an addition value corresponding to the generated key code value and the arbitrary accompaniment pattern is obtained from the scale array storage means, and the subtraction value or the addition value is the performance. 3. The automatic according to claim 2, wherein the key code value designated by the performance operation means is subtracted or added corresponding to the work, and the calculated key code value is notified to the sound source means. Scale generator. 4. The automatic scale generator according to claim 1, further comprising a selection unit that allows a player to select one of a plurality of accomp patterns as the arbitrary compac pattern.