JPH0869284A - Automatic accompaniment device - Google Patents

Abstract

PURPOSE: To provide an automatic accompaniment which imparts automatic accompaniment meeting the playing to be made by a player and is capable of executing the chord detection adaptive to various conditions. CONSTITUTION: This automatic accompaniment device has a chord name inputting means 2b for inputting of chord names by an operator, a chord constituting sound inputting means 1 for inputting chord constituting sound information by the operator, a storage means for storing the chord information making the chord names and the chord constituting sound corresponding to each other, a chord registering means for registering the chord information making the chord names inputted by the chord name inputting means 2b and the chord constituting sound information inputted by the chord constituting sound inputting means 1 corresponding to each other in the storage means, a playing information supplying means 1 for supplying playing information, a chord constituting sound extracting means for extracting the chord constituting sound information from the playing information supplied from the playing information supplying means and an accompaniment sound forming means for detecting the coincidence of the chord constituting sound information extracted by the chord constituting sound extracting means and the chord information of the storage means and forming accompaniment sounds according to the detected chord names.

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 providing automatic accompaniment according to a performance performed by a performer.

[0002]

2. Description of the Related Art An automatic accompaniment apparatus detects chords based on the depressed keys when a performer simultaneously presses a plurality of keys on a keyboard or the like, and produces an automatic accompaniment sound suitable for the detected chords. To generate.

Chord detection detects chords by referring to a preset table prepared in advance, based on a plurality of keys pressed simultaneously by the player. Since the preset table stores a plurality of note names that form each chord, the chord is uniquely determined by the combination of the constituent notes that are pressed. For example, when C-E-G (domiso) is pressed, the chord of CMaj is detected.

However, even when the same plurality of keys are pressed, there are cases where it is desired to have different chords depending on the style of music to be played or the preference of the player. For example, when the keyboard in the left keyboard range is pressed as F # -CE, in 8-beat pop music, a chord of CMaj ♭ 5 (sight measure flat five) is detected from the keyboard playing method of the band. It is natural that the chord D7 is detected in music such as the jazz piano trio because of its closeness to the piano playing method in the jazz piano trio. As described above, the chord is not uniquely determined according to the pressed key, but may change depending on the style of the song.

[0005]

The conventional automatic accompaniment apparatus always detects the same chord in accordance with the depressed key and performs the automatic accompaniment. However, there is a case where natural automatic accompaniment is not performed because appropriate chords differ depending on the style of the music to be played, the preference of the performer, and the like.

An object of the present invention is to provide an automatic accompaniment device capable of detecting chords adapted to various situations.

[0007]

SUMMARY OF THE INVENTION An automatic accompaniment apparatus of the present invention is a chord name input means for an operator to input a chord name, and a chord constituent sound input means for an operator to input chord constituent sound information. And storage means for storing chord information in which chord names are associated with chord constituent tone information, chord names input by the chord name input means, and chord constituent tone information input by the chord constituent tone input means. Chord registration means for registering the associated chord information in the storage means, performance information supply means for supplying performance information, and chord constituent sounds for extracting chord constituent sound information from the performance information supplied from the performance information supply means. Extraction means, chord detection means for detecting a match between chord constituent sound information extracted by the chord constituent sound extraction means and chord information in the storage means, and an accompaniment sound is generated according to the chord name detected by the chord detection means. Companion And a sound generation means.

[0008]

Since the operator can register the chord name and the corresponding chord constituent note information in the storage means, the chord information according to the operator can be stored in the storage means.
When the performance information is supplied, the chord name desired by the operator is read from the storage means and an accompaniment sound is generated.

[0009]

[Embodiment] A custom chord table is prepared in order to detect chords according to the style (tune style) of a musical piece to be played, preference of the player, and the like. The custom chord table stores chord constituent tones suitable for each style of music such as 8-beat pop and jazz piano. The operator can register the custom chord table using the operation switch provided in the automatic accompaniment device. Details will be described later.

The operator does not have to register all the chords in the custom chord table, but only the chords having a special combination of constituent tones. The automatic accompaniment device has a preset chord table in addition to the custom chord table. Chords that are not registered in the custom chord table are detected by the preset chord table. In the preset chord table, constituent tones of general chords are registered in advance, and normal chords are uniquely detected.

The basic form of the chord CMaj is composed of three tones C-EG (domiso), and the root tone C is the lowest tone of the three tones. A variation of the arrangement of three tones for this basic form is called a chord inversion form. The first inversion type is EG-C
(Misodo) and the second inversion type is GCE (Sodomi)
Is.

The preset chord table that stores ordinary chords stores only the note names of the constituent tones and not the arrangement of the constituent tones, so that the constituent tones are, for example, CEG and EG-.
CMaj is detected in any of C and G-C-E. On the other hand, since the custom chord table stores both the note names and arrangements of the constituent tones, in some cases it is possible to detect only the basic form without allowing detection of the inversion form of the chord.

For example, in a real jazz piano trio rather than an electronic musical instrument, it is assumed that three notes are simultaneously pressed with one left hand in order to play a 7th chord of something.
At this time, in general, the sound is made of 3 and 7 degrees and one tension note. A tension note is, for example, a sound of 9 degrees or the like, and by adding a tension note, it is possible to make a dull, dissonant sound. In this manner, when the third and seventh notes are played and another tension note is played, a pitch interval of about 2 degrees is inevitably produced. Considering the low interval limit, this pitch interval is a pitch interval that is not a problem in the vicinity of the center C on the keyboard, but is almost forbidden in the key range lower than C, which is the bass range. In other words, a chord containing a tension note sounds fine regardless of how it is turned in the middle and high key ranges, but is critical in the low key range, and it is rare that it can be turned. This is because the high frequency component is originally included in the high tone, so that the muddy sound is less noticeable, but the low sound becomes more muddy.

For the above reason, when performing chord detection using the custom chord table, when the key depression sound is higher than a predetermined pitch, not only the basic form of the chord but also the inversion form is detected, and the predetermined tone is detected. When it is below the high level, do not detect the inversion type.

The structure of the automatic accompaniment apparatus provided with the above-described custom chord table and preset chord table will be described below. FIG. 1 is a block diagram showing the configuration of an automatic accompaniment apparatus according to an embodiment of the present invention.

The user uses the keyboard 1 and switches (hereinafter,
Group 2 (abbreviated as SW) can be used to register a custom chord table. SW group 2 is a style selection SW
2a, chord name input SW 2b and custom chord input SW
2c.

Since the custom chord table can be registered for each style of the music to be played, the style selection SW 2a is first used to input the style of the music to be registered (for example, 8 beat pops). Next, using the chord name input SW2b, the chord name to be registered (for example, C
Maj) is input. After that, the custom chord input SW 2c is pressed while simultaneously pressing the keys corresponding to the constituent tones of the input chord name on the keyboard 1.

The CPU 5 receives the operation signal generated by the above operation and registers the custom chord table in the custom chord table memory 4. The preset chord table memory 3 stores a table of constituent chords of general chords in advance, and cannot be registered by the user.

The custom chord table memory 4 is a RAM
The preset chord table memory 3 is a ROM. The SW group 2 has automatic accompaniment start / stop SWs in addition to the above-mentioned SWs. When the start SW is pressed,
When the automatic accompaniment starts and the stop SW is pressed, the automatic accompaniment stops. If the stop SW is pressed, no automatic accompaniment sound is given and only the performance of the player on the keyboard 1 is sounded.

The keyboard 1 has a plurality of keys for performing a performance, and when a performer performs an operation such as key depression or key release, signals such as sound generation instruction information, pitch information or key depression speed are transmitted. To generate. The CPU 5 generates musical tone parameters based on various information signals generated on the keyboard 1 and supplies them to the tone generator 9. The sound source 9 is
It forms the musical tone signal required to produce a sound.

As described above, in response to the performance operation on the keyboard 1, the tone signal necessary for producing a sound is formed in the sound source 9. At the same time, the chord detection necessary for adding the automatic accompaniment sound is performed based on the keys pressed simultaneously on the keyboard 1.

The CPU 5 detects chords by referring to the custom chord table stored in the custom chord table memory 4 based on the keys pressed simultaneously on the keyboard 1. When the chord cannot be detected, it is checked whether or not the key depression sound is lower than a predetermined pitch. When it is small, not only the basic form of chord but also the inverted form is detected.
If it still cannot be detected, the chord is detected by referring to the preset chord table stored in the preset chord table memory 3.

Chords detected by referring to the custom chord table memory 4 or the preset chord table memory 3 are supplied to the automatic accompaniment circuit 8 by the CPU 5. When the automatic accompaniment start switch provided in the SW group 2 is pressed, the automatic accompaniment circuit 8 generates a musical tone signal of automatic accompaniment according to the supplied chord.

The mixer (MIX) 10 synthesizes the musical tone signal generated by the sound source 9 and the musical tone signal generated by the automatic accompaniment circuit 8 and supplies the synthesized signal to the sound system 11. The sound system 11 produces a sound according to the supplied musical tone signal.

The program memory 6 stores a calculation program. The CPU 5 performs the above-described processing by performing various calculations using the registers and the buffer memory provided in the working memory 7 according to this calculation program. The program memory 6 is a ROM and the working memory 7 is a RAM.

The CPU 5, via the bus 12, has a program memory 6, a working memory 7, a keyboard 1, a SW group 2,
The preset chord table memory 3, the custom chord table memory 4, the automatic accompaniment circuit 8, and the sound source 9 are controlled.

FIG. 2 shows the structure of the preset chord table stored in the preset chord table memory 3 shown in FIG. The table shows constituent sounds (NOTE) of each type (TYPE) when C is the root sound. The type (TYPE) is, for example, Major, minor, 7
th, m7th, M7th and the like. Component sound (NOT
E) indicates that 12 tones of C to B are allocated one bit each in order from the lower bit of the memory, and when the bit content is 1, it is a constituent sound, and when it is 0, it is not a constituent sound. Indicates. For example, CMaj
The constituent sounds of or are C, E, and G.

By referring to this table, it is possible to easily know the constituent sounds when C is the root sound. Further, even when a sound other than C is used as a root sound, by transposing this table, the constituent sounds can be derived, and it is not necessary to prepare another table. When the root sound changes, the constituent sounds also change regularly. For example,
If the root note is C #, each constituent note shown in the table is raised by a semitone. In other words, the chord C # Major
The constituent tones are C #, F and G #. Therefore, by shifting the constituent tones in the treble direction or the bass direction, respectively, it is possible to derive chord constituent tones with an arbitrary note name as the root note.

The corresponding chord can be detected by checking the note names of the keys pressed simultaneously on the keyboard and searching for the constituent notes whose note names are all the same. FIG.
The structure of the custom chord table stored in the custom chord table memory 4 shown in FIG. 1 is shown. The custom chord table can be set for each style (musical style), and the table in the style of the jazz piano trio is shown in the figure as an example.

The table shows the constituent sounds of each type (chord type) when C is the root note. Considering the arrangement of each pitch, the constituent sounds are composed of the lowest sound, the second sound, the third sound, and the fourth sound. The preset chord table does not consider the arrangement of notes, but does consider the custom chord table.

For example, the figure shows the constituent tones when the chord type is 7th, and E, A #,
It is composed of three D sounds. These constituent sounds are 7th constituent sounds in a jazz piano trio, and can be changed to different constituent sounds in an 8-beat pops table. The constituent tones shown in the table actually represent the basic form of chords when C is the root tone. The custom chord table can detect not only the basic form but also the inverted form. In that case, the lowest note shown in the table,
By changing the order of arrangement of the second and third sounds, it is possible to assemble and detect the inversion component sounds.

Further, chords having roots other than C can be detected by shifting, as in the case of the preset chord table described above. FIG.
3 is a flowchart showing the processing of a main routine performed by the CPU 5 shown in FIG. When the power of the automatic accompaniment device is turned on, the following process is started.

In step P1, initialization such as initialization of registers and buffer memories provided in the working memory is performed. In step P2, it is checked whether or not there is a key event indicating key-on or key-off by the key operation on the keyboard (1). If there is a key event, the key event is processed in step P3,
Go to 4. If there is no key event, the process directly proceeds to step P4. The key event of step P3 includes processing for performing chord detection using a preset chord table and a custom chord table, in addition to the sound generation processing or the mute processing. Details will be described later with reference to a flowchart.

In step P4, it is checked whether or not there is an event of the style selection SW (2a) provided in the SW group (2). For example, 8 is set in the style (tune style) selection switch.
There are beat pops, jazz piano trio, waltz, rock and so on. If there is a style selection SW event,
Since it indicates that any of the style selection switches has been pressed, the process proceeds to step P5, and the number of the selected style is stored in the register STYL. The selected style number STYL is designated as a style of a custom chord table used later when performing chord detection, or as a style of a custom chord table to be registered.

As a preparatory step, in step P6, the selected style number STYL is output to the automatic accompaniment circuit. Then, it progresses to step P7. If it is determined in step P4 that there is no style selection SW event, the process directly proceeds to step P7.

In step P7, it is checked whether or not there is an event of the chord name input SW (2b) provided in the SW group (2). The chord name input by the chord name input switch is the chord name that the operator wants to register in the custom chord table, and includes the chord root (for example, C) and the chord type (for example, Ma).
jor).

If there is an event of chord name input SW, the process proceeds to step P8 to store the inputted chord root note in the register IRT and the chord type in the register ITP. Then, it progresses to step P9. Note that step P7
If there is no chord name input SW event at, the process directly goes to step P9.

In step P9, it is checked whether or not there is an event of the custom chord input SW (2c) provided in the SW group (2). The custom chord input SW is pressed when registering chord constituent tones in the custom chord table for the style selected by the style selection SW and the chord name input by the chord name input SW. The operator can register the custom chord table by pressing on the keyboard (1) the constituent tones of the chord to be registered together with the custom chord input SW. When a constituent tone is pressed on the keyboard (1), in the key event process of step P3, the tone names of the four tones of the depressed key are sequentially stored in the key code buffer KCBFi. here,
The subscript i is an integer starting from 0, from the lowest pitch to the fourth
It is the number corresponding to the sound up to the sound.

If there is an event of the custom chord input SW, the process proceeds to step P10. In step P10, the note name in the key code buffer KCBFi is changed to the chord root note I.
Decrease the number of semitones corresponding to RT. The chord root IRT is
It is the root note designated by the chord name input switch (step P8). Since the component sound when the root note is C is stored in the custom chord table, it is necessary to reduce the number of semitones corresponding to the chord root note IRT. For example, if the designated chord root IRT is C (= 0), it is not necessary to lower the constituent tones, and if the chord root IRT is D (= 2), all the constituent tones are lowered by two semitones. . Lowering the constituent sound by one semitone means, for example, C → B, B → A #, A # → A, ...
., To change from C # to C.

In step P11, the key code buffer KCBFi is stored in the custom chord table of the selected style STYL in association with the chord type ITP. A custom chord table exists for each style STYL. The chord type ITP is the type designated by the chord name input SW (step P8), and the custom chord table of each style STYL stores the constituent tones for each chord type ITP. Then, it progresses to step P12. When it is determined in step P9 that there is no custom chord input SW event, the process directly proceeds to step P12.

At Step P12, it is checked whether or not there is an on event of the start / stop SW provided in the SW group (2). The start / stop SW has a function of a toggle SW for designating the start (start) and the stop (end) of automatic accompaniment, and the start and stop states are inverted each time the SW is pressed.

When there is an on event, it indicates that the switch has been pressed, so the flag RUN is inverted. The flag RUN indicates whether it is in the start or stop state, and originally it is in the stop state (RUN
= 0), it is inverted to the start state (RUN = 1), and if it is the start state (RUN = 1), it is inverted to the stop state (RUN = 0).

In step P14, it is checked whether or not the flag RUN is 1. If the flag RUN is 1, it indicates the start state, and the process advances to step P15 to output the automatic accompaniment start signal to the automatic accompaniment circuit (8). As a result, the automatic accompaniment circuit (8) starts generating an automatic accompaniment sound according to the detected chord. Then, it progresses to step P17.

On the other hand, the flag RUN is set to 0 in step P14.
If it is judged that the condition is "0", the stop condition is indicated. Therefore, the process advances to step P16, and the automatic accompaniment stop signal is output to the automatic accompaniment circuit (8). As a result, the automatic accompaniment circuit (8) ends the automatic accompaniment. After that, step P
Proceed to 17.

At step P17, other processing such as processing for adjusting the volume by the volume SW is performed. After that, step P
Return to 2 and repeat the process. FIG. 5 is a flowchart showing details of the key event process in step P3 of FIG.

At step Q1, it is checked whether the generated key event is a key-on event. If it is a key-on event, it indicates that a key on the keyboard (1) has been pressed, so that the operation proceeds to step Q2 and sound generation processing is performed.
The sound generation processing is a sound generation processing according to the pitch information, touch information, etc. of the depressed key. Then, it progresses to step Q4.

On the other hand, if it is determined in step Q1 that it is not a key-on event, since it is a key-off event, the process proceeds to step Q3, and the sound-deadening process is performed. Then, it progresses to step Q4. The key-off event is an event indicating that the key on the keyboard (1) has been released.

In step Q4, it is checked whether or not the flag RUN is 1. When the flag RUN is 1,
Since it indicates that the automatic accompaniment is in the start state, the routine proceeds to step Q5, and the flag FLG is reset to 0 for initialization. The flag FLG is a flag indicating whether or not the subsequent chord detection has succeeded. Flag FLG is 1
If this is the case, it indicates that the chord can be successfully detected using the custom chord table or the preset chord table, and if the flag FLG is 0, it indicates that the chord detection has failed.

At step Q6, chord detection is performed. The chord detection is performed by referring to the custom chord table or the preset chord table based on the keys pressed simultaneously by the performance operation performed on the keyboard (1). Details will be described later with reference to a flowchart.

In step Q7, it is checked whether the flag FLG is 1. If the flag FLG is 1, it indicates that a chord has been detected in the previous step, so the routine proceeds to step Q8. In step Q8, the chord root note RT and the chord type TP detected by the chord detection are output to the automatic accompaniment circuit (8). Then, the process ends. After that, the automatic accompaniment circuit (8) starts the automatic accompaniment according to the chord root note RT and the chord type TP by pressing the start switch provided in the SW group (2) as described above. Then, the process ends.

When it is determined in step Q7 that the flag FLG is 0, it means that a chord has not been detected, and the process is ended without doing anything. Step Q
When it is determined that the flag RUN is 0 in 4, it means that the automatic accompaniment is in the stopped state, and therefore the chord detection is not performed and the process proceeds to step Q9. Step Q9
Then, in the key code buffer KCBFi, the names of key depression tones from the lowest tone to four tones are sequentially stored among the keys that are simultaneously depressed on the keyboard (1). However, 4 keys are pressed at the same time.
When the following is true, i = 0 to the total number of key-depression tones−1.
Then, the process ends. Key code buffer KCBF
The note name stored in i is used as a constituent note of a chord when registered in the custom chord table as described above.

FIG. 6 is a flow chart showing details of the chord detection process in step Q6 of FIG. In step R1, the keyboard (1) is added to the key code buffer KCBFi.
Among the keys pressed at the same time, the key-pushing note names from the lowest note to the 4th note are stored. Here, i = 0 to 3. However, when the total number of key depression sounds is 4 or less, i = 0 to the total number of key depression sounds-1.

At step R2, 4 is set in the register N. The register N indicates the total number of constituent notes of the chord when searching using the custom chord table. At first, 4 is set in the register N, and the chord of the four constituent tones is searched as follows.

At step R3, 0 is set in the register SN. The register SN indicates the number of shifts of the note name when changing the root note and referring to the custom chord table. Initially, since the register SN is 0, a chord with C as the root note is detected.

In step R4, the key chord buffer KCBFi is referenced by referring to the custom chord table of the style STYL selected by the style selection switch as described above.
To search. In step R5, it is checked whether or not the corresponding chord is found by the search. If a chord is found, the process proceeds to step R17, and if not found, the process proceeds to step R6.

In step R6, the key code buffer K
The pitch name of CBFi is lowered by one semitone to prepare for a search for a chord in which the root note is shifted by one. In step R7, in order to shift the root note by one, the key code buffer KC
Since the shift for lowering the note name of BFi by one semitone is performed, the register SN is incremented.

At step R8, the value of the register SN is 1
Check whether it is 2. Since there are 12 tones of C to B, the fact that the register SN becomes 12 means that the chord cannot be detected even if the root note is shifted 12 times, and the root note makes one round and returns to C. Indicates that it has gone down. Register SN is 12
If not, the process returns to step R4 to detect a chord whose root note is shifted. When the root note is shifted and the search is repeated until the register SN becomes 12, it means that the chord cannot be detected for all the root notes, so the routine proceeds to step R9.

At step R9, the lowest key depression sound is C4.
Check if it is lower. The above is the detection of the basic form of the chord, but if the lowest note is not lower than C4, step R1 is performed to detect the inversion form of the chord.
Go to 0. In step R10, the key code buffer K
The CBFi is cyclically shifted to turn the chord. In step R11, the cyclically shifted key code buffer KC
Check whether BFi has returned to its original order. If the key code buffer KCBFi returns to the original order, it indicates that not only the basic form of the chord but also the inversion form cannot be detected. Key code buffer KCBFi
Is not returned to the original order, the process returns to step R3 to detect the turned chord. When the cyclically shifted key code buffer KCBFi has returned to the original order, the routine proceeds to step R12.

If the lowest tone of the key depression sound is lower than C4 in step R9, the inversion form of chord is rarely used normally, and therefore the process proceeds to step R12 without detecting the inversion form.

In step R12, it is checked whether or not the register N is 4. First, in step R2, register N
Since 4 has been set to, the process proceeds to step R13.
Since the chord consisting of the four constituent tones cannot be detected, the chord detection processing is performed on the assumption that the depressed chord is the chord consisting of the three constituent tones.

At step R13, the low to low key depression sounds are stored in the key code buffer KCBFi. Here, i = 0 to 2. However, when the total number of key depression sounds is 3 or less, i = 0 to the total number of key depression sounds-1.

In step R14, 3 is set in the register N to record that chord detection is performed for the three constituent tones. After that, the process returns to step R3 to detect chords of the three constituent tones.

If it is determined in step R12 that the register N is not 4, 3 is stored in the register N, and neither the 4 chord nor the 3 chord can be detected in the custom chord table. Since it indicates that the process has been completed, the process proceeds to step R15. Next, chord detection is performed using the preset chord table.

In step R15, all-key chord detection processing is performed by referring to the preset chord table. At this time, a search for all key matches is performed regardless of the arrangement of each key depression sound.
As described above, the register N stores the number of times the pitch name of the key code buffer KCBFi is shifted by one semitone in order to shift the root note.

In step R16, it is checked by the search using the preset chord table whether or not there is a matched chord. If there is a matched chord, the process proceeds to step R17.
At step R17, the flag FLG is set to 1 and
Record that a chord has been detected. At step R18, the value of the register SN is stored in the root register RT.
The number of times the root note is shifted is stored in the register SN, and the number of times corresponds to the root note RT of the detected chord.
For example, if the number of shifts SN = 0, the root note RT = 0
(C).

In step R19, the chord type register T
The type of chord matched by the search using the table is stored in P. Then, the process ends. If there is no matched chord in the preset chord table in step R16, it means that the chord could not be detected, so the process ends with the flag FLG kept at 0.

As described above, since the operator can independently register the custom chord table, it is possible to set the chord for each style (musical style) or according to the operator's preference. As a result, it is possible to detect different chords and perform automatic accompaniment when, for example, 8-beat pops and jazz piano trio are detected.

Further, the key depression sound is a predetermined pitch (for example, C
4) When it is higher than the specified chord, not only the basic form of the chord but also the inflected form is searched. When the pitch is lower than the predetermined pitch, only the basic form of the chord is searched, and the inflected form is not searched. It is possible to perform natural chord detection and automatic performance taking into consideration.

Incidentally, instead of the keyboard 1 shown in FIG. 1, performance information may be supplied by other MIDI input or the like. The chord specifying method divides the keyboard into, for example, a left key range for chord input and a right key range for melody input, and extracts the note name corresponding to the key pressed in the left key range as a constituent sound of the chord. You may do it. Further, it is also possible to apply it to only a part of the keyboard such as an electric tone which is divided into upper and lower keyboards.

The present invention has been described above with reference to the embodiments.
The present invention is not limited to these. For example, it will be apparent to those skilled in the art that various modifications, improvements, combinations, and the like can be made.

[0071]

As described above, according to the present invention,
Since the operator can register the chord name and the corresponding chord constituent sound information in the storage means, it is possible to generate accompaniment sounds according to various chords or chords that suit the operator's taste.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an automatic accompaniment apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a configuration of a preset chord table stored in a preset chord table memory shown in FIG.

FIG. 3 is a schematic diagram showing a configuration of a custom chord table stored in a custom chord table memory shown in FIG.

FIG. 4 is a flowchart showing processing of a main routine performed by the CPU shown in FIG.

FIG. 5 is a flowchart showing details of key event processing in step P3 of FIG.

FIG. 6 is a flowchart showing details of chord detection processing in step Q6 of FIG.

[Explanation of symbols]

1 keyboard, 2 switches, 2a style selection switch, 2b chord name input switch, 2c
Custom chord input switch, 3 preset chord table memory, 4 custom chord table memory,
5 CPU, 6 program memory, 7
Working memory, 8 automatic accompaniment circuit, 9 sound source, 10 mixer (MIX), 11 sound system, 12 bus

Claims (5)

[Claims] 1. A chord name input means (2b) for an operator to input a chord name, a chord constituent tone input means (1) for an operator to input chord constituent tone information, and a chord name and a chord. Storage means for storing chord information in which chord information is associated, chord in which chord name input by the chord name input means and chord constituent tone information input by the chord constituent note input means are associated with each other Chord registration means for registering information in the storage means, performance information supply means (1) for supplying performance information, and chord structure for extracting chord constituent sound information from the performance information supplied from the performance information supply means. Sound extraction means, chord detection means for detecting a match between the chord constituent sound information extracted by the chord constituent sound extraction means and the chord information in the storage means, and an accompaniment according to the chord name detected by the chord detection means. Automatic accompaniment apparatus and a accompaniment sound generating means for generating a. 2. The musical instrument further comprises a musical style input means (2a) for an operator to input a musical style, wherein the chord registration means provides chord information for each musical style input by the musical style input means. The automatic accompaniment apparatus according to claim 1, wherein the chord detection means performs registration in the storage means, and the chord detection means detects a chord name corresponding to chord information in the musical style input from the storage means by the musical style input means. 3. The storage means includes first storage means (3) for storing chord information in advance and second storage means (4) for storing chord information registered by the chord registration means.
3. The automatic accompaniment according to claim 1, wherein the chord detection means detects a match between the chord constituent sound information extracted by the chord constituent sound extracting means and the chord information in the first or second storage means. apparatus. 4. The chord detection means first detects the coincidence of chord information based on the second storage means, and when the coincidence cannot be detected, the chord information of the chord information is detected based on the first storage means. The automatic accompaniment apparatus according to claim 3, which detects a match. 5. The key range detecting means for detecting whether or not the performance information supplied from the performance information supplying means is higher than a predetermined pitch, and the chord detecting means includes the key range. When it is detected by the detection means that the pitch is higher than a predetermined pitch, the coincidence between the chord constituent note information extracted by the chord constituent note information extracting means and the chord information stored in the storage means is included in the basic form and the inversion form. The automatic accompaniment apparatus according to any one of claims 1 to 4, wherein when the sound is not higher than a predetermined pitch, it is detected that only the basic form is included without including the inversion form.