JPH06130956A - Automatic accompanying device - Google Patents

Abstract

PURPOSE:To realize varied automatic accompaniment with a small storage capacity. CONSTITUTION:Pattern designating information for eight bars which designates one of accompaniment patterns A to D for each bar and accompaniment pattern data indicating accompaniment patterns A to D are stored in a first storage part and a second storage part of a data memory 18 for accompaniment respectively. Chord information is successively inputted from an input means like a keyboard 22 for accompaniment in accordance with the advance of performance, and meanwhile, pattern designating information which designates accompaniment patterns A, C...B and accompaniment patterns which designate pattern designating information related to read are successively read out from the first storage part and the second storage part respectively, and automatic accompaniment is realized based on accompaniment patterns related to read and input chord information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic accompaniment apparatus suitable for generating chords, arpeggios, etc., and more particularly to sequentially reading out a plurality of accompaniment sound generation patterns designated by a plurality of pattern designation information. The accompaniment sound is generated based on the read accompaniment sound generation pattern and the chord information input from the keyboard or the like, thereby enabling accompaniment rich in changes with a small storage capacity.

[0002]

2. Description of the Related Art Conventionally, as an automatic accompaniment device for an electronic musical instrument, accompaniment sound generation patterns for one to two measures are stored, and the accompaniment sound generation patterns are repeatedly read and sounded as the keyboard performance progresses. It is known that an accompaniment sound such as a chord or an arpeggio sound is generated.

[0003]

According to the above-mentioned prior art, the accompaniment sound generation pattern has a short pattern of one to two measures, and there is a drawback that the accompaniment becomes monotonous when played repeatedly. . Also, in order to switch the accompaniment sound generation pattern during the performance, it is sufficient to operate the pattern selection switch, but the player has to be aware of something other than the performance and operate it, which may hinder the performance. It was

In order to realize a complicated accompaniment sound generation pattern, it is conceivable to store a long accompaniment sound generation pattern that extends over a number of measures, but in this case, the amount of data to be stored becomes large. is there.

An object of the present invention is to provide a novel automatic accompaniment device which can perform a variety of automatic accompaniment with a small storage capacity.

[0006]

SUMMARY OF THE INVENTION An automatic accompaniment apparatus according to the present invention has an input means for sequentially inputting chord information in accordance with the progress of a musical piece and a plurality of Ms (M is an integer of 2 or more) different from each other. Pattern storage means for storing a plurality of accompaniment pattern data each representing a sound generation pattern;
Sequence storage means for storing Nth (N is an integer larger than M) pattern designation information, wherein the first to Nth pattern designation information are all accompaniment sounds having a plurality of pattern designation information less than N. A pattern in which a plurality of M accompaniment sound generation patterns are appropriately combined and designated, and that the first to Nth pattern designation information are sequentially read from the sequence storage means in accordance with a predetermined tempo. First read-out means for outputting, and second read-out means for reading accompaniment pattern data representing an accompaniment sound generation pattern designated by the pattern designation information read out from the sequence storage means from the pattern storage means in accordance with the predetermined tempo. , Accompaniment based on chord information input from the input means and accompaniment pattern data read from the pattern storage means It is obtained by a accompaniment tone generating means for generating a signal.

[0007]

According to the configuration of the present invention, a plurality of M accompaniment sound generation patterns are designated by appropriately combining them with the first to Nth (N> M) pattern designation information. For example, assuming that there are four kinds of A, B, C, and D, these are appropriately combined, and for example, A-B-A-C-A-B-A.
It is possible to realize a long accompaniment pattern such as -D, and it is possible to generate a variety of accompaniment sounds.

Further, for the same accompaniment sound generation pattern designated by a plurality of pattern designation information, it is sufficient to store one accompaniment pattern data corresponding thereto, and the amount of data to be stored can be small.

Further, input means such as a keyboard for sequentially inputting chord information in accordance with the progress of the musical composition is provided so that an accompaniment tone signal is generated based on the inputted chord information and the accompaniment pattern data read. As a result, complicated musical accompaniment accompaniment is possible according to the input chord information.

[0010]

1 is a circuit diagram of an automatic accompaniment apparatus for an electronic musical instrument according to an embodiment of the present invention.

The bus 10 has a central processing unit (CPU) 1
2, program memory 14, working memory 16, accompaniment data memory 18, tempo timer 20, accompaniment keyboard 22, rhythm type selection circuit 24 and accompaniment sound formation circuit 26.
Are connected.

The CPU 12 executes various data processing and control processing in accordance with a program stored in a program memory 14 formed of a ROM (Read Only Memory), and various processing for accompaniment sound generation is shown in FIG. And, it will be described later with reference to FIG.

The working memory 16 is composed of a RAM (Random Access Memory), and includes portions functioning as various registers, counters, flags, etc. as shown in FIG. 1 for accompaniment sound generation. Details of each of these functional parts will be described later.

The accompaniment data memory 18 is composed of a ROM and has a first storage section for storing pattern type data and a second storage section for storing accompaniment pattern data. The data formats in the first and second storage units will be described later with reference to FIGS.

The tempo timer 20 generates an interrupt command signal (a kind of tempo clock signal) at a constant cycle corresponding to a thirty-second note in accordance with a given tempo, and each time this interrupt command signal is generated,
The interrupt routine of FIG. 6 is started.

The accompaniment keyboard 22 includes a large number of keys and a key switch corresponding to each of these keys, and is a lower keyboard in an ordinary two-step keyboard electronic musical instrument. In addition,
Hereinafter, the “accompaniment keyboard” is abbreviated as “LK”.

The rhythm type selection circuit 24 is for selecting an arbitrary rhythm type such as march, waltz, swing, or rumba, and includes a rhythm selection switch corresponding to each rhythm type.

The accompaniment sound forming circuit 26 forms an accompaniment sound signal based on the key depression data extracted from the LK 22 and the accompaniment pattern data read from the second storage section of the accompaniment data memory 18. The accompaniment sound signal is supplied to the speaker 30 via the output amplifier 28 and is sounded as an accompaniment sound.

The roles and actions of various registers, counters, flags, etc. in the working memory 16 are as follows (1) to (9).

(1) LK Data Register (LKREG) This is for storing the key depression data corresponding to the key depressed by the LK22 for four notes in order from the highest pitch. In storing such data, a specific one octave is set as a limited sound range, and the key press data corresponding to a key pressed outside this limited sound range is shifted by the octave so as to be within the limited sound range. Store.

(2) Root register (RTREG) This is for storing root data representing the root of a chord.

(3) Chord type register (TYPRE
G) This is for storing chord type data representing a chord type (for example, any of major, minor, seventh, etc.). In storing such data, the chord type is detected based on the key depression data corresponding to the key depression in the LK22. However, depending on the key depression mode in the LK22, the chord type cannot be detected (chord is not established).
In such a case, a chord failure is also treated as a kind of chord type, and chord type data corresponding thereto is stored.

(4) Rhythm type register (RNORE
G) This is for storing rhythm type data representing a specific rhythm type (for example, waltz) selected by the rhythm type selection circuit 24.

(5) Tempo Counter (TCNT) This is one in which the count value is incremented by 1 every time a ten pointer interrupt is applied by the tempo timer 20 for each 32nd note, and is cleared when the count value reaches 32. It is like this. That is, if one bar has 32 beats, the count value of the tempo counter TCNT corresponds to the beat number.

(6) Bar Counter (BCNT) This counts the number of bars, and is incremented by 1 each time the count value of the tempo counter TCNT reaches 32, and is cleared when the count value reaches 8. It is like this.

(7) Pattern type register (PTNOR
EG) This is for storing pattern type data for eight measures representing the type of accompaniment pattern for each measure, and the pattern type data stored here is the accompaniment data memory 18
Is read from the first storage unit of the.

(8) Delay register (DREG) This is for storing data of four notes of each eighth note of the accompaniment pattern data of one measure, and the data stored here is the accompaniment. The data is read from the second storage section of the data memory 18 for use.

(9) Shift mode flag (SMFLG) This is a register for storing 1-bit data, and if the content is "1", it indicates the shift mode,
If it is "0", it indicates the normal mode. Here, in the normal mode, the LK data register LKREG
Is a mode in which an accompaniment sound corresponding to the key press data in the LKREG is generated, and the shift mode is an accompaniment sound that does not directly correspond to the key press data in the LKREG by adding the pitch data to the root note data to shift the pitch. It is a mode to generate sound.

In the first storage section of the accompaniment data memory 18, as shown in FIG. 2, the accompaniment pattern type A is set for each bar.
Up to eight consecutive types of pattern type data representing any of D to D are stored for a maximum of rhythm type × chord type. In other words, the series of pattern type data shown in FIG. 2 corresponds to a specific rhythm type (for example, waltz) and a specific chord type (for example, major), and is different for each rhythm type or chord type. Such a series of pattern type data is stored.

It should be noted that common pattern type data may be stored so as to be read when some or all of the rhythm types have the same chord type.

In the second storage section of the accompaniment data memory 18, as shown in FIG. 3, the above-mentioned accompaniment pattern type A,
Four sets of accompaniment pattern data respectively corresponding to B, C, and D are stored for a maximum of rhythm type × chord type.
In other words, the four sets of accompaniment pattern data shown in FIG.
It corresponds to a specific rhythm type (for example, waltz) and a specific chord type (for example, major), and four sets of accompaniment pattern data are stored for each different rhythm type or chord type.

Note that common accompaniment pattern data may be stored so as to be read when some or all of the rhythm types have the same chord type.

Assuming four storage areas each storing four sets of accompaniment pattern data in FIG. 3, the head address of each storage area indicates a pattern corresponding to each of the accompaniment pattern types A to D described above. It is type data. That is, each pattern type data in FIG. 2 is made up of data indicating the start address of the storage area in which the accompaniment pattern data corresponding to the pattern type data is stored.

On the other hand, the accompaniment pattern data of each set is shown in FIG.
As shown representatively for the accompaniment pattern type A, an accompaniment sound generation pattern for one measure is divided into four for each eighth note.
The data T11 to T14, T21 to T24, ... In this case, the accompaniment pattern data for one measure can include the normal mode data for each eighth note and the shift mode data for each eighth note. As an example, if the data T11 to T14 corresponding to the first eighth note is the normal mode and the data T21 to T24 corresponding to the second eighth note is for the shift mode, the data for one note in each mode The format is as representatively shown in FIG. 3 for the data T11 and T21.

That is, the data for one note for the normal mode includes the key-on event data KON, the delay data DLY, the octave data OCC, and the pitch order data PTH, as shown for the data T11. The data for one tone for the shift mode includes key-on event data KON, delay data DLY, and pitch data IV, as shown with respect to data T21.
L and.

In either the normal mode data or the shift mode data, the key-on event data KO
N indicates whether or not pronunciation is required by one bit, and is "1" if pronunciation is required and "0" if non-pronunciation is required.

In addition, the delay data DLY is used for both the normal mode data and the shift mode data.
Indicates with two bits the timing of sound generation from T _{0 to} T ₃ in the section corresponding to the eighth note length as shown in FIG. 4, and when it is “00”, it is T ₀ and “01”.
If so, T ₁ means "T", T ₂ means T ₂ , and "11" means T ₃ . By providing such delay data DLY, it is possible to generate sound with a resolution of 32nd note in the eighth note section. However, of the data for four notes for each eighth note, the data for the first note (T1
1, T21, etc.), the delay data DLY
The LSB (least significant bit) of the 2 bits is used as a mode designating bit, and "1" indicates a shift mode, and "0" indicates a normal mode. Therefore, 1
Some note data can only obtain 16th note resolution, but the frequency of occurrence of 32nd note is extremely low, and the resolution of 32nd note can be used for 2nd to 4th note data. So, there is no practical problem.

In the normal mode data, the octave data OCC indicates a relative octave with respect to a specific octave (limited sound range) preset for the key depression data in the LK data register LKREG. The pitch order data PTH represents the pitch of the sound to be sounded by designating the pitch order from the treble side in the LK data register LKREG. For example, if the pitch order data PTH represents the pitch order 1, the highest note in LKREG is sounded. If the pitch order data PTH is all "0" bits, the sound being sounded is erased (key off).
Means

In the shift mode data, the pitch data IVL represents a pitch (interval) of, for example, 3 degrees with respect to the root note in the root note register RTREG.
If this is all bits "0", the above pitch order data PT
As in the case of H, it means key-off.

In the example of FIG. 3 described above, the data for normal mode and the data for shift mode are mixed in the accompaniment pattern data for one bar, but the accompaniment pattern data corresponding to the failure of a chord, which is a kind of chord type, is , Created only with normal mode data. This is because the root note cannot be detected when the chord is not established, and therefore it is impossible to generate the accompaniment sound in the shift mode.

Next, the processing of the main routine relating to the generation of accompaniment sound will be described with reference to FIG.

First, when a start switch (not shown) is turned on, in step 40, an initial set process is performed to set or reset various registers and the like in the working memory 16 of FIG. That is, the count value 31 is set in the tempo counter TCNT, the count value 7 is set in the bar counter BCNT, and the LK data register LKREG and root register RT are set.
REG, chord type register TYPREG, rhythm type register RNOREG, pattern type register PTNO
The REG, the delay register DREG, and the shift mode flag SMFLG are reset (cleared).

Next, at step 42, the key switch of the LK 22, the rhythm selection switch of the rhythm type selection circuit 24, and other switches not shown are scanned and the respective operation states are input. Then, in step 44, LK2
In 2, it is determined whether there is a change in the key switch state (LK event). If yes (Y), the process proceeds to step 46.

At step 46, the key-depression data corresponding to the key depressed by LK22 is LKRE in descending order of pitch.
Store in G. In this case, with respect to the key depression data corresponding to the key pressed outside the limited sound range, the octave is shifted and stored so as to be within the limited sound range. And step 4
At 8, the root note and type of the chord are detected based on the key depression data in LKREG, and the obtained root note data and chord type data are stored in RTREG and TYPREG, respectively. In this case, if the chord type cannot be detected, the chord type data corresponding to the failure of the chord is stored in TYPREG, but nothing is stored in RTREG because the root note cannot be detected. After this, the process proceeds to step 50. In addition, step 4
If there is no LK event (N) in the judgment of step 4, step 4
Go to step 50 without going through 6 and 48.

In step 50, it is determined whether or not there is a change (event) in the operation state of the rhythm selection switch, and there is (Y)
If so, the process proceeds to step 52. Then, in step 52, rhythm type data representing the rhythm type corresponding to the operated rhythm selection switch is stored in RNOREG. After this, the process proceeds to step 54. Note that step 50
If there is no event (N), the process proceeds to step 54 without passing through step 52.

In step 54, it is determined whether or not there is a change (event) in the operation state of switches other than the key switch and the rhythm selection switch. If yes (Y), the process proceeds to step 56 and the process corresponding to the switch in which the event occurred. After executing, the process returns to step 42. If there is no event (N) in the determination in step 54, step 56
Return to step 42 without going through.

After that, a series of processes as described above are repeated, but when an interrupt command signal is generated by the tempo timer 20 (a ten pointer interrupt is applied),
The interrupt routine of FIG. 6 is started.

In FIG. 6, when the ten pointer interrupt is applied, the count value of TCNT is incremented by 1 in step 60. Then, the process proceeds to step 62, and it is determined whether the end value of one bar is reached by checking whether the count value of TCNT is 32 or not. Since the count value 31 is initially set in TCNT as described above, the count value of TCNT becomes 32 in step 60 in the first ten pointer interrupt after the start switch is turned on. Therefore, in the judgment of step 62, it is judged to be the end of one bar (Y), and then the routine proceeds to step 64.

At step 64, TCNT is cleared. Then, the process proceeds to step 66, and the count value of BCNT is incremented by 1.

Next, at step 68, by checking whether the count value of BCNT is 8, it is judged whether it is the end of 8 bars.
As described above, since the count value 7 is initially set in BCNT, in the first ten pointer interrupt,
In step 66, the count value of BCNT becomes 8. Therefore, in the determination in step 68, it is determined that it is the end of 8 measures (Y), and the process proceeds to step 70.

At step 70, BCNT is cleared,
Then, the process proceeds to step 72. If it is determined in step 68 that the end of eight measures is not completed (N), the process proceeds to step 72 without passing through step 70.

In step 72, the memory 18 is generated based on the rhythm type data in RNOREG, the chord type data in TYPREG, and the count value of BCNT.
Of the pattern type data from the first storage unit of
Store in NOREG. As an example, as described above, BC
Assuming that the count value of NT is 0 and the rhythm type data and the chord type data specify a series of pattern type data of FIG. The pattern type data (data indicating the accompaniment pattern type A) corresponding to one bar is read out and stored in PTNOREG. After this, step 7
Go to 4. If it is determined in step 62 that it is not the end of one bar (N), the process proceeds to step 74 without going through steps 64-72.

In step 74, it is judged whether it is an eighth note timing by checking whether the count value of TCNT corresponds to any of 0, 4, 8, 12, 16, 20, 24 and 28. As an example, if the count value is 0 due to the clearing of TCNT as described above, the determination result of step 74 is affirmative (Y), and step 7
Go to 6.

In step 76, the pattern type data in PTNOREG, the rhythm type data in RNOREG, the chord type data in TYPREG, and TCNT.
The accompaniment pattern data for four tones is read out from the second storage section of the memory 18 based on the count value of and is stored in DREG. As an example, as described above, the data in the PTNOREG indicates the accompaniment pattern type A and the TCN
If the count value of T is 0, the second value of the memory 18
The accompaniment pattern data T11 to T14 for four tones in FIG. 3 are read from the storage unit of FIG.

Next, in step 78, the shift mode is determined by checking whether the LSB of the first sound delay data DLY in DREG is "1". As an example, as described above, the data in the DREG is the data T11 to T in FIG.
If it is 14 (normal mode data), the determination result of step 78 is negative (N), and step 8
Move to 0.

In step 80, SMFLG is reset. Then, the process proceeds to step 82, and it is determined whether SMFLG is "1". In this case, SM in the previous step 80
Since the FLG has been reset, the determination result is negative (N), and the routine goes to step 84.

In step 84, an accompaniment sound is generated based on the data for which the value of the delay data DLY is 0 out of the data for four sounds in DREG and the key pressing data in LKREG. Then, the data whose DLY value is 0 is deleted from the DREG. In this case, which key depression data in LKREG is used for accompaniment sound generation is determined by the pitch order data PTH in the data having a DLY value of 0. As an example, the data in the DREG is T11 to T1 as described above.
4, and if the DLY value of T14 is 0, the key depression data in LKREG is read according to the pitch order data PTH of this data T14 and is supplied to the accompaniment sound forming circuit 26. An accompaniment sound corresponding to the key depression data is generated. That is, assuming that the pitch rank data PTH of the data T14 represents, for example, rank 4, the key press data having the lowest pitch is read out from the key press data of four notes in the LKREG. Then, a corresponding accompaniment sound is generated. And the data T14 is D
It is erased from inside the REG. In this case, LKREG
If there is no key depression data corresponding to order 4, no accompaniment sound is generated. Further, not only one sound is produced but up to four sounds can be produced simultaneously.

After that, the process returns to the routine of FIG. Then, when the next ten pointer interrupt is applied, the routine of FIG. 6 is started again, and the above processing is repeated.

In this case, in the judgment of step 62, since only the time corresponding to 32nd notes has elapsed from the start of one bar, the judgment result is negative (N), and the routine proceeds to step 74. Then, in the determination in step 74, 8
Since it is not the timing of a quarter note, the determination result is negative (N), and the routine goes to step 86.

In step 86, the value of the delay data DLY for the data of four sounds in DREG is checked, and if it is not 0, it is decreased by 1. In the last ten pointer rap
Since the data having the DLY value of 0 has been erased in step 84, in the ten pointer interrupt this time, D
This means that there is no LY value 0 data remaining. Therefore,
If there is data to be pronounced in DREG,
The DLY value is 1, 2, or 3, and 1 is subtracted from each value. As an example, the data T14 is erased from the DREG as described above,
If 12 has a DLY value of 1, then DLY of this data
The value becomes 0 by the processing of step 86.

Next, when proceeding to step 84 through step 82, since the DLY value of the data T12 is 0, the LKRE is the same as the previous time according to the pitch order data of the data T12.
The key depression data is read from G, and an accompaniment sound corresponding to this key depression data is generated. Then, the data T12 is erased.

Similarly, assuming that the DLY value of the data T11 is 2 and the DLY value of the data T13 is 3 from the beginning, the DLY value of the data T11 becomes 0 in the next ten pointer interrupt, D of data T13
The LY value becomes 0 at the next ten pointer interrupt.
Therefore, the accompaniment sound based on the data T14 is set to, for example, T in FIG.
If it is generated at the timing of ₀ , then the LKR designated by the data T12, T11, and T13 respectively.
The accompaniment sound corresponding to the in-EG key depression data can be sequentially generated at a timing of T ₁ , T ₂ , and T _{3 in} FIG. 4 with a delay of 32nd notes.

As described above, since the LSB of DLY is used as the mode instruction bit for the data T11, only 0 or 2 can be given as the DLY value. However, for the data T12, T13, T14, the DL
Any value of 0 to 3 can be given as the Y value.
Therefore, by appropriately selecting the DLY value of the data T11 to T14, it is possible to set various sounding timings in one eighth note section.

As described above, the first eight in FIG.
After the four ten pointer interrupts for the diacritics,
When the first ten pointer interrupt regarding the next eighth note is applied, the determination result of step 74 becomes positive (Y),
Move to step 76.

At step 76, data T21 to T24 for four sounds are read from the second storage section of the memory 18 according to the count value 4 of TCNT and stored in DREG.

Next, when it is judged at step 78 that the shift mode is set, since the data T21 to T24 are for the shift mode, the judgment result at step 78 becomes affirmative (Y), and the routine goes to step 88.

At step 88, SMFLG is set to "1". Then, the process proceeds to step 82, SMFLG
Is judged as "1". The result of this determination is affirmative (Y), so the routine proceeds to step 90.

In step 90, an accompaniment sound is generated based on the data having a DLY value of 0 out of the data for four sounds in DREG and the root sound data in RTREG. And D
Erase the data of LY value 0. In this case, the pitch of the accompaniment note to be generated is determined by adding the root note data and the pitch data in the data of DLY value 0. As an example, if the DREG internal data is T21 to T24 and the DLY value of T22 is 0 as described above, the data obtained by adding the data T22 and the root note data is set to the accompaniment sound forming circuit 26. Is supplied to an accompaniment sound corresponding to the addition data. And the data T22 is DRE
Erased from within G.

Thereafter, ten pointer interrupts are applied three times as in the normal mode as described above. If the DLY value in DREG is not 0 for each interrupt, the DLY value is decreased by 1, and data having a DLY value of 0 and root data are obtained. Based on this, an accompaniment sound is generated. For the data T21, DLY
Only 1 or 3 can be given as a value, but since any of DLY values 0 to 3 can be given to the data T22 to T24, the data T21 to T2 can be given.
By appropriately selecting the DLY value of 4, various tone generation timings can be set in one eighth note section.

The accompaniment sound generation processing as described above for the two eighth notes is similarly executed thereafter for each eighth note. Then, when the processing for one bar corresponding to the accompaniment pattern type A is completed and the second bar is reached, in step 72, the pattern type data corresponding to the accompaniment pattern type C of FIG. 2 is stored in PTNOREG, and the same as above. Then, the accompaniment pattern data corresponding to the accompaniment pattern type C is read out by the processing of step 74 and thereafter, and the generation of the accompaniment sound is controlled. The processing for each measure is repeated up to the 8th bar in the same manner. When it is determined in step 68 that the end of the 8th bar is reached, the process returns to the first bar and the same process for 8 measures is repeated.

[0071]

As described above, according to the present invention, the performance order of a plurality of accompaniment sound generation patterns is stored and the accompaniment sounds are generated in accordance with the order, so that the accompaniment sound generation pattern is automatically generated. The monotony of the accompaniment is improved without increasing the burden on the performer.

Further, since the accompaniment sound is generated according to the chord specified according to the progression of the music, the atmosphere of the music can be changed by the combination with the chord progression even with the same accompaniment sound generation pattern. A large number of pieces of music can be handled by combining the accompaniment sound generation pattern and the chord progression.

Further, when the same pattern appears in the performance order of the accompaniment sound generation pattern, it is not necessary to store the same pattern in duplicate, so that the storage capacity can be reduced.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a format of pattern type data.

FIG. 3 is a diagram showing a format of accompaniment pattern data.

FIG. 4 is a time chart for explaining sounding timing in an eighth note section.

FIG. 5 is a flowchart showing a main routine relating to accompaniment sound generation.

FIG. 6 is a flowchart showing an interrupt routine relating to accompaniment sound generation.

[Explanation of symbols]

10 ... Bus, 12 ... Central processing unit, 14 ... Program memory, 16 ... Working memory, 18 ... Accompaniment data memory, 20 ... Tempo timer, 22 ... Accompaniment keyboard, 24 ...
Rhythm type selection circuit, 26 ... Accompaniment sound forming circuit.

Claims (1)

[Claims] 1. Input means for sequentially inputting chord information in accordance with progress of a musical composition, and a plurality of accompaniment pattern data representing a plurality of M (M is an integer of 2 or more) different accompaniment sound generation patterns. The pattern storage means and the sequence storage means for storing the first to Nth (N is an integer larger than M) pattern designation information.
The Nth pattern designating information designates a plurality of M accompaniment sound generating patterns by appropriately combining them so that a plurality of pattern designating information smaller than the total number N designates the same accompaniment sound generating patterns. Of the accompaniment sound generation pattern designated by the pattern designation information read from the sequence storage means, and a first reading means for sequentially reading the first to Nth pattern designation information from the sequence storage means according to the tempo of FIG. Second read means for reading the accompaniment pattern data from the pattern storage means in accordance with the predetermined tempo, and accompaniment sound based on the chord information input from the input means and the accompaniment pattern data read from the pattern storage means. An automatic accompaniment device for an electronic musical instrument, comprising: an accompaniment sound generating means for generating a signal.