JPH07248769A - Automatic accompaniment device of electronic musical instrument - Google Patents

Abstract

PURPOSE:To perform a chord input employing a natural input method so as to conduct a profound chord accompaniment. CONSTITUTION:The device is provided with a chord information generating means 10 which generates key outputs of a prescribed number of sound names that are beforehand set when arbitrary number of keys for detecting a chord are pressed during a chord detection, an accompaniment data storage means 12 which stores a prescribed number of chord system accompaniment pattern data and a sounding data generating means 11 which generates accompaniment sounding data having larger number of chord system more than the number of keys pressed based on a chord information outputted from the means 10 and the accompaniment pattern data stored in the means 12. Thus, accompaniment sounding data having a larger number of chord systems more than the number of keys pushed are generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic accompaniment device for an electronic musical instrument, for example, an automatic musical instrument accompaniment for an electronic musical instrument, which allows a thicker chord accompaniment to be performed simply by pressing a key of three notes. It is suitable for use in an apparatus.

[0002]

2. Description of the Related Art Conventionally, an electronic keyboard musical instrument such as an electronic piano, or an electronic musical instrument such as a sound source module having no keyboard, which has a so-called automatic accompaniment device, has been widely known. In the above-mentioned automatic accompaniment apparatus, for example, for each rhythm such as rock or waltz, reference accompaniment data (pitch C major as reference, which includes pitch data representing pitch, sounding timing data, volume data, and sounding duration data. Are often created in)) is stored in advance.

Then, the accompaniment data of the above criteria and maj
To generate pronunciation data for pronouncing an accompaniment sound from chord information including chord types (chord types) such as (major) and min (minor), and root notes (chord root) such as C, D, and E. Therefore, the accompaniment chord is changed according to the progress of the music, and the automatic accompaniment is performed.

Two methods are known as methods for generating accompaniment pronunciation data based on the accompaniment data and chord information (generally, two methods are used together for each part). That is, one is a method using a pitch shift table, in which pitch conversion data corresponding to the chord type of the current chord information is searched, and the pitch of the pronunciation data is shifted up and down by the conversion data. is there.

Another method is to keep the range of chords produced during automatic accompaniment within a certain range.
This is the Chord Inver previously stored in memory.
This is a method in which chord generation data for chord generation is selectively selected while referring to the pitch being generated from a tone (chord turn) table.

Further, an electronic musical instrument having an automatic accompaniment device is known which is provided with a pattern maker which allows a user to freely edit automatic accompaniment data. As a conventional method of pattern making using a chord turning table in such an electronic musical instrument, there is a method of having a table of three chords (FIG. 12) and inputting three chords as an input when creating a pattern.

[0007]

When performing the chord accompaniment of the 3 chord system using the table of the 3 chord system,
There were times when I felt a little unsatisfactory in terms of thickness. In order to satisfy such a demand, in order to realize thicker chord accompaniment, chords of four chords are required. Therefore, when the 4-chord table is used, the pronunciation data becomes 4 tones, and it is necessary to input 4 tones for one chord at the time of data input.

Normally, the chords used on the keyboard are often pressed with three tones, but when using the four-chord table as described above, when trying to perform real-time input, the four-chord is always depressed. Since it must be done, it was not very preferable in terms of operation.

In view of the above problems, the present invention realizes an electronic musical instrument having a built-in pattern maker capable of inputting chords by a natural input method when a user creates a thick chord accompaniment. The purpose is to

[0010]

According to the automatic accompaniment apparatus for an electronic musical instrument of the present invention, when a plurality of arbitrary chord detection keys are depressed at the time of chord detection, the number of depressed keys is preset. In order to store chord information accompaniment pattern data of a predetermined number and chord information generating means for deriving a key depression output of only the preset predetermined number of note names even if the number is a predetermined number or more. Chords larger than the number of pressed keys based on the accompaniment data storage means, the chord information output from the chord information generation means, and the accompaniment pattern data stored in the accompaniment data storage means. And a pronunciation data generating means for generating accompaniment pronunciation data of the system.

Another feature of the present invention is that
The chord information generating means in the automatic accompaniment apparatus for the electronic musical instrument outputs the key-depression output of only three note names when the number of keys on the keyboard is larger than three.

Another feature of the present invention is that the accompaniment data storage means stores a chord inversion table of a 4-chord system, and the sound generation data generation means is 3 from the chord information generation means. When a chord chord is output, pattern data for one note is added to the pattern data for the above-mentioned three chords, so that tone generation data for four notes is generated by depressing three tones.

[0013]

Since the automatic accompaniment apparatus for an electronic musical instrument of the present invention comprises the above technical means, when a predetermined number of chord detection keyboards are depressed, a key depression output corresponding to the depressed key is derived. , A process of writing a predetermined number of additional note data to the key press output is performed, so that more chord-based pronunciation data than the key-depressed chords are generated, and a thicker keyboard accompaniment with less accompaniment is generated. You can do it by pressing the key.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the automatic accompaniment apparatus for an electronic musical instrument of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing a main configuration of an automatic accompaniment apparatus of the present invention, and FIG. 2 is a block diagram showing a main configuration of an electronic musical instrument to which the automatic accompaniment apparatus for an electronic musical instrument of this embodiment is applied. .

As is apparent from FIG. 1, the automatic accompaniment apparatus for an electronic musical instrument of this embodiment comprises chord information generating means 10, sound data generating means 11, accompaniment data storage means 12, and sound signal generating circuit 13. .

The chord information generating means 10 filters a predetermined keyboard, for example, a keyboard other than C / E / G, or forcibly outputs a sound other than C / E / G to C / when a chord is detected. It is provided for converting into E / G so that substantially only three note names are input from the keyboard.

Thus, when an arbitrary plurality of chord detection keyboards are depressed, the preset keyboard is set even if the number of depressed keys is equal to or larger than a preset number. Only the chord of the note name corresponding to is derived as the key depression output.

The accompaniment data storage means 12 is provided to store accompaniment pattern data of four-tone system, and in the present embodiment, for example, a data table as shown in FIG. 9 accompanies. It is stored in the data storage means 12.

The pronunciation data generation means 11 writes the data of one note (for example, the data of the B note) when the key depression output is derived from the chord information generating means 10 and inputs only three notes to produce a four-note system. It is provided in order to be able to perform conversion using the code inversion table.

As shown in FIG. 2, the electronic musical instrument of this embodiment comprises a keyboard 1 and an operation panel 2, which are connected to a bus 3 via a keyboard interface 1a and a panel interface 2a, respectively.

Further, the circuit portion of the electronic musical instrument has a data bus 3
It is composed of a microcomputer including a CPU 4, a RAM 5, a program memory 6 and an accompaniment pattern data memory 7 which are connected by.

The CPU 4 detects operation information of the keyboard 1 from a key switch circuit (not shown) connected to the keyboard 1,
The operation information of the panel switch is detected from a panel switch circuit (not shown) connected to the operation panel 2.

The rhythm selected by the operation panel 2, the type of musical instrument, the intonation value corresponding to the dial operation, etc. are displayed from the CPU 4 on a display drive circuit (not shown).
It is displayed based on the display data given to the display device 8 via.

The CPU 4 also reads out note information corresponding to keyboard operation and parameter information such as rhythm and tone color corresponding to panel switch operation from the accompaniment pattern data memory 7 and sends it to the tone signal generating circuit 9.

That is, automatic accompaniment (performance) data is written in the accompaniment pattern data memory 7, and C
The PU 4 reads out the automatic accompaniment data corresponding to the operation of the automatic accompaniment selection button of the operation panel 2 and supplies it to the musical sound signal generation circuit 9. As a result, along with the pronunciation corresponding to the key operation,
Automatic accompaniment chord sounds, bass sounds, drum sounds, etc. are given to the speaker 21 via the amplifier 20 and sounded.

Here, in order to facilitate understanding of the automatic accompaniment apparatus for an electronic musical instrument of this embodiment, the pitch shift processing and chord inversion type selection processing will be described. The pitch shift processing searches the pitch conversion data corresponding to the chord type of the current chord information from the data table, and shifts the pitch indicated by the [key number] of the pronunciation data up or down by the value of the pitch conversion data. It is executed according to the procedure.

For example, as shown in FIG. 8, conversion data corresponding to the code type of the current chord information is 0, +1, 0, ...
.., 0, -1, C ^# of the read tone data [key number] is shifted to D, and B is shifted to A ^# .

In other words, in this pitch shift processing, only the notes that are considered to be suitable for the chord type out of the 12 notes that form the normal scale according to the chord type of the chord information that is currently set. We are trying to create a dedicated scale that is constructed.

Next, the code inversion type selection processing will be described. First, as shown in FIG. 9, the data table used in the code inversion type selection process is Chord. 1-Chor
d. Corresponding to each of the n chord types of n, m chord generating data (Inv. 1 to In) consisting of a plurality (up to 4 in this embodiment) of pitch data forming chords.
v. m) is stored.

That is, in FIG. 9, Wn-1, Xn-
For each symbol such as 2, Yn-3, the first alphabet is 1
In addition to showing the note chords such as C, D, and E in the octave, the number part represents the pitch data indicating the octave position, and for each chord type, there are m chords consisting of up to 4 notes. Generation data (Inv. 1 to In
v. m) is stored.

More specifically, as shown in FIG. 9, for example, the code type Chord. 1 is maj (major), chord generation data Inv. Two
Is stored as chord generation data composed of three tones of C, E, and G in the same octave. In addition, hereinafter, each chord generating data set in plural for each chord type is referred to as a chord turning type or simply a turning type.

Next, from here, the chord inversion type selection processing for selectively selecting the chord inversion type according to the code type of the current code information from such a data table, the flowcharts of FIGS. 10 and 11. Will be explained.

The chord inversion type selection process is executed so that the range of chords produced during automatic accompaniment falls within a certain range, and the performer uses the rhythm selection switch 6 described above in advance. It is assumed that the chord reference highest note T ₀ is input. Further, in FIGS. 10 and 11, x4 represents the highest pitch sound among the sounds forming the inversion form of the chord.

As shown in FIG. 10, when the execution of the code inversion type selection processing of this embodiment is started, first, in step S400, the code information is stored in the RAM 5 (that is, the code type is updated). Is the first time, and if it is the first time, the process proceeds to step S410.

Then, in step S410, from the second data map shown in FIG. 9, m inversion type Inv. Corresponding to the code type of the code information stored in the RAM 5 in the processing of the main routine. 1-Inv. read m,
Among its inversions, x4 = T ₀ , that is,
It is judged whether or not the highest note of the chopped form of the chord is equal to the reference highest note T ₀ specified by the performer, and the result is × 4.
When it is determined that there is one with = T ₀ , the inversion form is selected and the process ends.

On the other hand, in step S410, × 4 = T ₀
If it is determined that there is no such thing, in the subsequent step S420, "1" is set to the counter (j) in which the value of 1 represents the minimum pitch difference of each note forming the inversion form of the chord, In a succeeding step S430, it is determined whether or not there is an inversion type in which × 4 = T ₀ −j.

Then, in step S430, x4 = T
_When it is determined that there is a turning form of _0- j, the turning form is selected and the process ends. Conversely, × 4 =
When it is determined that there is no inversion type of T ₀ −j, in the subsequent step S440, this time, × 4 = T ₀ +
It is judged whether or not there is an inversion form that is j, and x4 = T
_When it is determined that there is a turning form of ₀ + j, the turning form is selected, and the process ends. If it is determined in step S440 that there is no inversion type with × 4 = T ₀ + j, the subsequent step S45.
At "0", "1" is added to the counter j, and step S43
Return to 0.

That is, steps S410 to S4
In the processing of 50, from among the inversion forms read at that time,
× 4 and to the difference between the reference maximum sound T ₀ selects the smallest inversion type, the difference between the × 4 and the reference maximum sound T ₀ is 0, -1, +
The search is made in the order of 1, -2, +2, -3, ... until the inversion form exists.

On the other hand, if it is determined in step S400 that the code type is not updated for the first time, that is, if it is determined that the code type has been updated for the second time or later, the process proceeds to step S460.
The second and subsequent selection processes are executed. That is, the second and subsequent selection processes are executed as shown in FIG. First,
In step S470, the highest note T of the inversion type selected last time
Whether m-1 is equal to the reference highest tone T ₀ (Tm-1 = T
₍ Whether it is ₀ or not) is determined.

Then, in this step S470, Tm
When it is determined that −1 = T ₀ , step S48.
0, and the steps S410 to S45 described above are performed.
The processing of steps S480 to S520 exactly the same as 0 is executed. That is, when Tm-1 = T ₀ ,
Just as when the code type was updated the first time,
The difference between x4 and the highest reference tone T ₀ is 0, -1, +1, -2,
The search is performed until the inversion form exists in the order of ..., The inversion form that can be searched is selected, and the processing is ended.

On the other hand, in step S470, Tm-1 =
If it is determined that it is not T ₀ , the process proceeds to step S530, and it is determined whether Tm−1 is (T ₀ −3) or less. Then, when it is determined that Tm-1 is (T ₀ -3) or less, the process proceeds to step S480, and the processes of steps S480 to S520 are executed as in the above case. This is because Tm−1, that is, the highest note of the inversion type (previous chord) selected last time is too far from the reference highest note T ₀ , and is returned to the original value.

Further, at step S530, when it is determined that the Tm-1 is (T ₀ -3) not less, the process proceeds to step S540, Tm-1 determines whether T ₀ is less than. When the Tm-1 is judged to T ₀ is less than, i.e., Tm-1 = T ₀ -1 or Tm-1,
= T ₀ −2, the process proceeds to step S550, and it is determined whether or not there is an inversion form with × 4 = Tm−1, and there is an inversion form with × 4 = Tm−1. If so, the inversion type is selected and the process ends.

This is the highest note Tm of the inversion type selected last time.
Since -1 is not so far from the reference highest tone T ₀ ,
This is because if there is an inversion of the same highest note, it will be selected preferentially. Then, in step S550, × 4
When it is determined that there is no inversion type with Tm−1, the process proceeds to step S480.

On the other hand, in step S540, if the Tm-1 is determined to not less than T _0, the step S5
60 proceeds to, to determine whether a Tm-1 is (T ₀ +3) above, if it is Tm-1 is (T ₀ +3) or more, the process proceeds to step S570.

In step S570, similar to the processing in steps S410 and S480 described above,
At that time, it is judged whether or not there is a inversion form read out from the second data map that has × 4 = T ₀ ,
When it is determined that there is one with × 4 = T ₀ ,
The inversion form is selected and the process ends.

Then, in step S570, × 4 = T
If it is determined that there is nothing that is ₀ , the counter j is set to "1" in the following step S580, and in the following step S590, there is an inversion type in which x4 = T ₀ + j. Determine whether or not. Then, when it is determined in step S590 that there is a revolving form of × 4 = T ₀ + j, the revolving form is selected and the process ends. On the contrary to the above, when it is determined that there is no inversion form with × 4 = T ₀ + j, the following step S
At 600, it is now determined whether there is an inversion form with x4 = T ₀ -j.

Further, in step S600, × 4 = T ₀
When it is determined that there is a turning form that is -j, the turning form is selected and the process ends. Conversely, × 4 = T
If it is determined that there is no inversion form that is _0- j,
In subsequent step S610, "1" is added to counter j, and the process returns to step S590.

Meanwhile, in step S560, when it is determined that not Tm-1 is (T ₀ +3) above, ie, T
If m-1 = T ₀ +1 or Tm-1 = T ₀ +2, the process proceeds to step S620, it is determined whether or not there is a reversal type with x4 = Tm-1, and x4 = Tm-1
If there is an inversion form, the inversion form is selected and the process ends. On the contrary, if there is no inversion type with x4 = Tm-1, the process proceeds to step S570.

That is, steps S560 and S6
20, the processing of steps S570 to S610 is as follows.
Step S530, Step S550, Step S48
Although it is similar to the processing of 0 to step S520, the processing corresponding to step S500 and the processing corresponding to step S510 are reversed, but for the following reason.

That is, since the processing after step S570 is processing when the highest note Tm-1 of the inversion type selected last time is higher than the reference highest note T ₀ , the fluctuation of the highest note of the chord to be generated is reduced as much as possible. In order to do so, when it is determined in step S570 that there is no inversion form with × 4 = T _0, it is first checked whether there is an inversion form with × 4 = T ₀ + j. Because it is better.

As described above, in the code inversion type selection processing, according to the code type of the code information to be updated,
The m inversion forms are read from the second data table. And, from the inversion form read out above, the highest tone x4 is
A chord that is input in advance by the player and is close to the reference highest note T ₀ is preferentially selected. As a result, the tone range of the chord to be produced falls within a certain range, and a more natural accompaniment tone can be produced.

In the chord reversal type selection processing, the chord type is updated for the first time and the chord type is updated for the second time and thereafter, so that the chord type is selected last time. The inversion type is selected in consideration of the highest note of the inversion type.

By the way, as pattern data which is a source for performing conversion using the chord inversion table of the four-note chord system, C / E / G / B which has C as a fundamental tone in one chord is used.
Sound is needed. In the present embodiment, by using the method described in detail below, it is practically possible to remove 3 keys from the keyboard.
By inputting only one note name, it is possible to perform conversion using a chord inversion table of a 4-chord system.

That is, as shown in FIG. 3, when the processing is started, each initialization processing when the power is turned on is performed in step S1. Next, in step S2, the switch of the operation panel 2 is scanned to detect an event, and in step S3, the keyboard is scanned to detect the key number and the key pressing strength having the event.

Next, in step S4, it is determined whether the current operation mode is the automatic accompaniment mode. If it is not the automatic accompaniment mode, the process advances to step S12. The mode is determined by the panel switch. If the result of the determination in step S4 is the automatic accompaniment mode, the process proceeds to step S5 and it is determined whether or not the event detected in step S3 is a chord detection keyboard. If the result of this determination is that the chord detection keyboard has been depressed, the operation proceeds to step S6 (usually, the lower key is used as the chord detection keyboard in the automatic accompaniment mode).

In step S6, the code name is detected based on the pressed state of the chord detection keyboard, and then the process proceeds to step S7. In step S7, it is determined whether or not the automatic accompaniment is being performed. If the automatic accompaniment is being performed, the process proceeds to step S8. If not, the step S16 is performed.
Proceed to.

In step S8, it is determined whether or not the step count is being performed by the timer. If yes, the process proceeds to step S9. If not, step S1 is performed.
Jump to 6. In step S9, a flag indicating that the step has been counted is reset. And
In the next step S10, the accompaniment pattern data is read from the accompaniment pattern data memory 7 to create the pronunciation data, and when the creation of the pronunciation data is completed, the next step S10 is performed.
Proceeding to 11, the tone generation processing of the data created in step S10 is performed.

On the other hand, when the process proceeds from step S4 to step S12, it is first determined whether or not the pattern maker mode is set.
Proceed to 15 to perform pattern maker processing. If it is not the pattern maker mode, the process proceeds to step S13 to detect whether or not the pattern maker switch is turned on.

If the pattern maker switch is on, the operation proceeds to step S14, and the operation mode is set to the pattern maker mode. If the pattern maker switch is not turned on, the process jumps to step S16 to perform a normal keyboard sounding process.

Next, the timer processing will be described with reference to FIG. When the timer processing is started, first, the step time is counted in step S1, and then it is determined in step S2 whether or not the step time is the head of the next bar. If it is the head of the next bar, step S
After the step time is reset at 3, the process proceeds to step S4. If it is not the head of the next bar, the process directly jumps to step S4. Then, in step S4, the step time count completed flag is set, whereby the step time of the main routine can be processed.

Next, the pattern maker processing will be described with reference to FIG. When the pattern maker process is started, first, in step S1, it is determined whether or not the step count process is being performed by the timer. Then, if the above processing is performed, the process proceeds to step S2,
If not, the process jumps to step S10.

In step S2, a process of resetting a flag indicating that the step has been counted is performed, and the process proceeds to the next step S3. In step S3, a counter for counting the gate time of the sound being sounded is incremented. In the next step S4, a process of reading the already edited data from the working area of the RAM 5 is performed.

In step S5, it is determined whether or not the step time of the data matches the internal step time. Then, if the two match, step S6.
Go to step S10, and if they do not match, go to step S10. Strictly speaking, the coincidence in this case is a state of [data step time ≧ internal step time].

In step S6, the data read in step S4 is written to the writing side of the working area of the RAM 5. Once this process is complete,
In step S7, it is determined whether the data is the end. If it is end data, the process proceeds to step S9, and READ / WRIT of the working area of the RAM 5 is performed.
Processing for switching E is performed. If the result of determination in step S7 is not end data, step S8
If the read data is note data, sound generation processing is performed.

In step S10, it is determined whether or not it is a key event. If it is a key event, the process proceeds to step S12, and if not, the process proceeds to step S19. In step S12, it is determined whether the part uses the chord turning table. As a result of the above determination, if the part uses the chord turning table, the process proceeds to step S13, and if not, the process proceeds to step S16a.

In step S13, the key event is C /
It is determined whether the key is an E / G key. As a result of this determination, if the key event is other than the C / E / G key, the process jumps to step S19, and if the key event is the C / E / G key, the process proceeds to step S16 and step S17 sequentially.

Then, in step S16, the keyboard data is written as pattern data. Further, in step S17, a process of writing an additional sound is performed in response to the key event of the third key being performed. Then, step S1
Proceed to step 8 to perform keyboard sound / silence processing. Also, when the process proceeds to step S16a, the keyboard data writing process similar to step S16 is performed, and then the process proceeds to step S18.

In step S19, the state of the edit part changeover switch is judged. If the switch is on, the process proceeds to step S20 to perform edit part changeover processing to save the pattern data being edited,
The pattern data of the selected part is secured in the working area of the RAM 5.

If the edit part changeover switch is off, the process proceeds to step S21 to determine the state of the part data clear switch. If the switch is on, the process proceeds to step S21 to save the data being edited on the working area of the RAM5. Perform processing to clear.

In the next step S23, the state of the save switch (which can also be used as the pattern maker switch) is determined. If the switch is on, the process proceeds to step S24 to save the pattern data being edited, and then the step S2.
Go to 6.

If the save switch is off, the process goes to step S25 to judge the state of the exit switch. If the switch is on, the process goes to step S26 to finish the pattern making, and returns to the main routine.

Next, the keyboard data writing process will be described with reference to FIG. As shown in FIG. 6, when the process is started, it is determined in step S1 whether or not there is a key-on. If the key is on, steps S2, S3, S4
If the key is off, the process proceeds to step S9.

When the process proceeds to steps S2, S3, and S4 in sequence, the key number is written in the RAM 5 (step S2), the step time at that time is written in the RAM 5 (step S3), and it is detected from the keyboard. The process of writing the velocities to the RAM 5 (step S4) is sequentially performed.

When such processing is completed, next, in step S5, the empty Ch. Determine if there is. Then, the empty Ch. If there is not, the Ch. Write the gate time of No. to the RAM 5 and set the empty Ch. And the process of muting the sound being produced in step S7, and then
Go to step S8. In addition, empty C on the gate counter
h. If there is, the process directly goes to step S8. In step S8, the empty Ch. Key number. To start gate counting.

On the other hand, if the result of determination in step S1 is that the key is not on, steps S9, S10,
In step S11, the key number Ch. To search. Next, in step S10, the corresponding Ch. The gate count of 1 is completed, and the process of writing in the RAM 5 is performed in step S11.

Next, the additional sound data writing process will be described with reference to FIG. When this writing process is started, it is determined in step S1 whether or not there is a key-on. If the result of this determination is key-on, step S2
~ S9, if the key is off, steps S10 ~ S13
Proceed to.

In step S2, the key-on event is 3
It is determined whether or not it is the key (that is, whether or not the third key is pressed), and if it is not the third key, the process returns. If it is the third key, the process proceeds to steps S3 to S5 in order. In step S3, the key number is converted to B sound and written in the RAM 5, and in step S4, the step time at that time is R
Write to AM5. Further, in step S5, VELOSITY detected from the keyboard is written in the RAM5.

Then, in step S6, the empty Ch. If there is an empty Ch. If there is not, the process proceeds to step S7 and the Ch. Write the gate time of the RAM to the RAM 5 and empty Ch. To provide. Next, in step S8, the sound being generated is muted, and then the process proceeds to step S9.

Further, as a result of the judgment in step S6, the gate counter becomes empty Ch. If there is, go directly to step S. In step S9, the empty Ch. Key number. To start gate counting.

On the other hand, steps S10 to S1
1. If the process proceeds to step S12 and step S13, the RAM 5 of the data written in the gate with the keyboard off
Key number of the next data above. Is read, and if it is B sound (additional sound), its key number. From the gate counter Ch. search for. Corresponding Ch. End the gate count and write to RAM5.

In the above-described embodiment, the conversion is performed by using the 4-chord chord inversion table with the 3-tone input. However, in addition to this, for example, the 5-chord chord inversion table with the 3-tone input is used. May be used, or conversion may be performed using a five-note chord inversion table with four-tone input.

[0082]

As described above, according to the present invention, the chord information generating means for deriving the key-depression output of only a predetermined number of note names when a plurality of chord detection keys are depressed at the time of chord detection, Based on accompaniment data storage means for storing a number of chordal accompaniment pattern data, chord information output from the chord information generation means, and accompaniment pattern data stored in the accompaniment data storage means hand,
Since there is provided the pronunciation data generating means for generating the accompaniment pronunciation data of the chord system, which is more than the number of the pressed keys, when the predetermined number of chord detection keyboards are depressed, the above-mentioned key depression output is output. By performing a process of writing a predetermined number of additional note data, it is possible to generate chord sound data that is larger than the number of the pressed chords. As a result, a thicker chord accompaniment can be performed only by pressing a few keys.

[Brief description of drawings]

FIG. 1 is a functional configuration diagram of essential parts showing an embodiment of an automatic accompaniment apparatus for an electronic musical instrument of the present invention.

FIG. 2 is a block diagram showing a configuration of a main part of an electronic musical instrument.

FIG. 3 is a flowchart for explaining the overall operation of this embodiment.

FIG. 4 is a flowchart illustrating a procedure of timer processing.

FIG. 5 is a flowchart for explaining the procedure of pattern maker processing.

FIG. 6 is a flowchart for explaining a procedure of keyboard data writing processing.

FIG. 7 is a flowchart for explaining a procedure of additional sound data writing processing.

FIG. 8 is a diagram showing an example of a data table used in a pitch shift process.

FIG. 9 is a diagram showing an example of a data table used in the code inversion type selection processing.

FIG. 10 is a flowchart for explaining a procedure of chord inversion selection processing.

FIG. 11 is a flowchart for explaining the procedure of the second and subsequent selection processes in the flowchart of FIG.

FIG. 12 is a diagram showing an example of a table of three chords.

[Explanation of reference symbols] 1 keyboard 2 operation panel 3 data bus 4 CPU 5 RAM 6 program memory 7 accompaniment pattern data memory 8 display device 9 tone signal generation circuit 10 chord information generation means 11 sound data generation means 12 accompaniment data storage means 14 modes Setting unit 20 Amplifier 21 Speaker

Claims (3)

[Claims] 1. When a plurality of chord detection keys are depressed at the time of chord detection, even if the number of depressed keys is equal to or more than a preset number, the preset number is not set. Output from the chord information generating means, a chord information generating means for deriving a key depression output of only a predetermined number of note names, an accompaniment data storing means for storing a predetermined number of accompaniment pattern data of chords, Code information,
Sounding data generation means for generating chordal accompaniment sounding data, which is larger in number than the number of depressed keys, based on accompaniment pattern data stored in the accompaniment data storage means. An automatic accompaniment device for electronic musical instruments. 2. The electronic musical instrument according to claim 1, wherein the chord information generating means outputs a key-depression output of only three note names when the number of keys pressed on the keyboard is more than three. Automatic accompaniment device. 3. The accompaniment data storage means stores a chord-based chord rotation table, and the pronunciation data generation means, when the chord information generation means outputs a chord-based chord, The automatic musical instrument according to claim 1, wherein the tone data of four tones are generated by pressing the keys of three tones by adding the pattern data of one tone to the pattern data of the three chords. Accompaniment device.