JPS61292689A - Electronic musical instrument with automatic accompanying device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The invention will be explained in the following order.

Industrial Application Field Overview of the Invention Conventional Technology Problems to be Solved by the Invention and Embodiments of Solving Means Configuration Explanation of the Electronic Musical Instrument in Figure 1 Explanation of the Operation of the Electronic Musical Instrument in Figure 1 1 Main Processing (Figure 5) ) 2. Program processing (Fig. 6) 3. Key press m entry processing (Fig. 7) 4. Category 1 writing processing (Fig. 8) 5. Automatic accompaniment processing 6. Interrupt processing (Fig. 9) 7. , Channel-specific processing (Fig. 10) 8. Key-on processing (Fig. 11) 9. Interruption processing l!p (continued) Variations of the embodiment Effects of the invention [Industrial application field] This invention provides This invention relates to an electronic musical instrument with an automatic accompaniment device that can perform automatic accompaniment using a unique pattern.

[Summary of the Invention] The present invention provides an electronic musical instrument with an automatic accompaniment function that automatically detects the key depression timing of each depression in keyboard accompaniment, and provides a memory in which the key depression timing and depression information can be rewritten. By storing the accompaniment pattern in the key, a desired accompaniment pattern can be created in real time using the keys.

[Prior Art] Conventionally, as an automatic accompaniment device for an electronic musical instrument, an accompaniment pattern stored in a read-only memory, such as a normal arpeggio or an arpeggio "sick chord (multi-tone arpeggio)", is converted into chord information input from an am. There are known instruments that change the pitch by transposing the key depending on the pitch and producing the sound (automatic accompaniment).

However, such automatic accompaniment merely reproduces pre-stored patterns, and does not necessarily satisfy the performer.

[Problems to be Solved by the Invention and Means for Solving the Problems] An object of the present invention is to provide an electronic musical instrument with an automatic accompaniment device that allows original patterns to be created and played in a simple manner.

In order to achieve the above object, the present invention detects the timing at which key information is generated by keyboard operations based on a predetermined performance tempo, stores this key information and information on its generation timing in a rewritable memory, and automatically detects the timing at which key information is generated by keyboard operations. During performance, the information read from this memory can be selected as accompaniment pattern information, allowing the performer to create a pattern suitable for his or her performance in real time. That is, in the electronic musical instrument of the present invention, if a desired accompaniment is played in accordance with a predetermined performance tempo, it can be automatically stored as an accompaniment pattern.

[Example code] The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an overview of the operation surface of an electronic musical instrument with custom accompaniment according to an embodiment of the present invention. This invention is applied to an electronic musical instrument that automatically performs music while changing the accompaniment pattern read from a read-only memory according to chord information input from the keyboard.

Explanation of the configuration of the electronic musical instrument shown in FIG. 1. The operation screen shown in FIG.
The program mode ( A program switch 5 for selecting a user pattern, which is a pattern created in the program mode, as an accompaniment pattern during automatic accompaniment mode; Clear switch 7 for erasing, Transfer switch 8 for temporarily copying the desired accompaniment pattern as a user pattern when creating a user pattern by correcting any of the existing accompaniment patterns mentioned above, Transfer switch 8 for copying the desired accompaniment pattern to the performer. 1 beat to signal (
Metronome display lamps 9 are arranged that flash every quarter note (quarter note).

FIG. 2 shows the hardware configuration of the electronic musical instrument shown in FIG. In the figure, a keyboard circuit 10 detects a key depression on a keyboard 1 (FIG. 1) and generates key information (key code) representing the depression. This key code is as shown in Figure 3, where the pressed (key) position is C+ + C# + *D.
+ , ..., B+ * 02 + ..., a multiple of 12 (in decimal notation) 12.24°36 for each C note
,..., then 1 every semitone for other keys.
It is assigned a numerical value that increases by increments. The (key) code representing a rest, that is, a state in which no key is pressed, is 0. In the following, numerical data such as key codes will be expressed in decimal numbers unless otherwise specified.

The central processing unit (CPU) 11 includes a bidirectional pass line 1.
2, in addition to the keyboard circuit 10, a program memory 13, a working memory 14, a pattern memory 15, and a switch group 16 consisting of each operation switch 2 to 8 (FIG. 1) are connected.
, tempo generator 17 and tone generator (TG)
18 etc. are connected.

CPU 11 is! ! It takes in key information output from the board circuit 10 and switch information from the switch group 16, and forms predetermined musical tone information (information such as start of sound, stop of sound, pitch, timbre, etc.) through arithmetic processing based on these information. It also controls the overall operation of the electronic musical instrument, such as sending this musical tone information to the tone generator 18.

Program memory 13 is read-only memory (ROM)
The control program for the CPU 11 is stored therein.

The working memory 14 is for temporarily storing various data generated when the CPU 11 executes a control program, and is, for example, a random access memory (RAM).
It consists of the following various flags, registers, buffer 1, etc.

QNT: Counts the clock counter tempo clock Cm2 CLK: Increment count value when the count value of timing counter QNT goes from 2 to 0
Cm63 (0-31: Current timing within odd-numbered measures, 32
~63: Current timing within even measures) OLDCLK r
Previous timing value register Normal CLK-1, however, when CLK=O (1DcLK=63RUN: Run flag Flag indicating whether the alvegic code is running (=1) or stopped (=0) TIME 1 to TIME3: It is provided for each channel of the timer algorithm code, and counts the number of clocks since the previous event occurred.However, when there is no event, it is 255, when the key is on, it is O, and when the key is off, it is +.
Add 128.

Further, it is set to O during key-on due to actual key depression.

As a result, when assigning a channel, if you find the one with the maximum TIME value, the assignment priority will be set to an empty channel.
The order can be as follows: oldest key released channel>oldest key pressed channel.

Key code register for KC+ to KC3 nib program In program mode, store the key code in the key-on KCi of channel 1 occupied by the actual key press,
The Haku's KO is used for key-off channel scanning when releasing the O0 key.

T: Temporary buffer for CLK 0LDT: Temporary buffer for OLDCLK IROOT: C takes values from 0 to 11 corresponding to root registers C, C#, ..., B
HORD: Code type register C, CM? , Cm, C7, C751
134, Cm7.

DL lower, N0T, which takes a value of 0 to 7 corresponding to Cm7-5
E: Temporary buff? KEY: Key code register for albesic code [m]i: Pointer for reading data For continuous data in pattern memory 15. m=T.

0LDT, CLK, 0LDCLK0boi>9[m]i is the pattern select switch (user pattern switch 6
This refers to the contents of address m of sound generation channel 1 in pattern No. specified by

In addition, in the following explanation, each register etc. and its contents shall be represented by the same label name in J3.

For example, the albesic code key code register and its contents are both KEY.

As shown in FIG. 4, the pattern memory 15 includes a ROM area dedicated to continuous playback in which existing accompaniment patterns (pattern numbers 1 to 12) are stored, and a rewritable ROM area in which a user pattern (pattern number 13) is stored. RAM area (
pattern register). Each pattern area is provided with a 65-byte key code storage area for three channels (Chl to ch3) for storing accompaniment data (key codes 12 to 84 and rest data 0). In these patterns, addresses (0 to 63) correspond to the count value of the timing counter CLK. That is, the data at each address represents the sound generation state of an accompaniment sound such as a key press or a key release at the address where the data is stored, that is, at the timing.

The tempo setter 17 is composed of, for example, a variable frequency oscillator, or a fixed frequency oscillator, and a frequency divider with a variable division ratio that divides the output of this oscillator to create a tempo clock. A tempo clock with a cycle of 1/24 is generated. The cycle of the tempo clock is varied by a tempo setter (not shown) (volume, switch, etc.) arranged on the operation surface.

The tone generator 18 has four sound generation channels for accompaniment sound formation, three sound generation channels for melody sound formation, and one sound generation channel for bass sound formation, and generates musical tones corresponding to musical tone information provided from the CPU 11. (melody sound, accompaniment sound and bass sound) form a signal. This musical tone signal is converted into sound and produced by a sound system (not shown).

Description of the operation of the electronic musical instrument shown in FIG. 1 Next, the operation of this electronic musical instrument will be explained with reference to the flowcharts shown in FIGS. 5 to 11.

1. Main Process Referring to FIG. 5, when the electronic musical instrument is powered on, the CPU 11 starts operating according to the control program stored in the program memory 13 (step 100).
. In step 101, a clock counter QNT, a timing counter CLK, a root register ROOT, a run flag RUN, and a program key code register KC are used.
Clear +~KC3 and set previous timing value register O and D
CLK to -1 and timer TIM E +~TI
After initializing the entire circuit, such as setting ME3 to 255, the main processing operation consisting of steps 102 to 121 and step 200 is executed.

In step 102, program switch 5 in switch group 16 is tested to determine the operating mode of the electronic musical instrument. If the switch 5 is in the on state, the program mode is in effect, and the program processing (described later) in step 200 is executed. On the other hand, if the switch 5 is in the off state, the automatic accompaniment processing in steps 110 to 114 (described later) is executed as the automatic accompaniment mode. After execution, the process moves to step 120. In step 120, the run/stop switch 3 is checked, and each time the run/stop switch 3 is pressed, the run flag RtJN is changed from 0'' to 1'' or from 1'' to 0''.
Toggle change to . In the following step 121, the pattern select switch 2 is scanned to select the selected pattern (
1 to 12) or pattern register (=pattern 13)
After performing pattern select switch processing such as detecting and setting read pointer [m]i to the start address of each channel 1 of selected patterns 1 to 13,
Return to step 102.

2. Program Processing FIG. 6 shows the program processing subroutine of step 200 in FIG. Referring to FIG. 6, in step 201, it is determined whether the current moment is immediately after the program switch 5 is turned on. If it is immediately after turning on, in step 202 the run flag RUN is set to 11111, the run/stop switch 3 is forcibly turned on, and the root name register RO is
Clear OT and set code type register CHORD to C
Set the timer TIM E +
~TIME3 is set to 255 (empty channel), respectively.

If it is not immediately after turning on, the process of step 202 is not performed,
Step 201 directly proceeds to step 203.

In steps 203 and 204, it is determined whether or not the transfer switch 8 is turned on. Transfer accompaniment pattern to pattern register.

Furthermore, in steps 205 and 206, it is determined whether or not the clear switch 7 is on, and if it is on, that is, when creating a completely new pattern, all pattern registers are cleared (all rests), and each timer Set each of TIME+ to TIME3 to 255 (empty channel).

In step 210, the run flag RUN is checked.
If the run flag RLIN has been reset, this means that pattern creation has been completed and the run/stop switch 3 has been put in the stopped state, so the program processing routine is immediately skipped and the main processing (step 120 in Figure 5) is started. return. On the other hand, if the run flag RLIN is set, the process moves to step 211. Steps 211 and 2
In step 12, the presence or absence of key press and key release is checked, and if a key press event occurs, key press writing processing is performed (step 300).
is executed, and if a key release event occurs, a release II process (step 400) is executed. Key press event is also txt
If no tn event has occurred, or if the key press or release m write process has been completed in accordance with the key press or release event that has occurred, the process advances to step 220 and chord tone selection process is executed. In this electronic musical instrument, the chord tone color select switch and the tone color select switch 4 for melody tone are also used, and in step 220, the chord tone information corresponding to the selected state of the tone color select 1 switch 4 is set to tone. The signal is sent to the generator 18. In addition, the above-mentioned key press record, processing (step 300) and release t41
Interrupts are disabled during the write process (step 400).

3. Key press writing process FIG. 7 shows details of the key press writing process (step 300) in FIG. This electronic musical instrument is configured to be able to simultaneously produce up to three tones as accompaniment sounds, and has three channels for producing and storing sounds. Therefore,
If there is a fourth press w1 (key-on), it is necessary to empty one of the channels and allocate the key data resulting from this fourth press.

Here, this key data assignment (key all-in) is
If there is an empty channel, the process is performed on the empty channel, if there is no empty channel, the oldest key released channel is used, and if there is neither an empty channel nor an aita channel, the oldest key pressed channel is used. Such a channel is a timer T
This is the channel with the largest content of rMcr, that is, the clock value.

Referring to FIG. 7, in step 301, timer TIM
Search for the one rtMct with the maximum clock value among E + -T I M E 3, and in the following step 302, TI
It is checked whether the time value of MEi is O. TIME
If i = O, all three channels are currently key-on due to actual key depression. In this case, the four keys have the same priority, so three channels are left as they are.
Ignore the fourth key press.

In other words, if TrMEi = O, the key press at this time is ignored and the original routine (6th
Return to step 212) in the figure. On the other hand, if the determination in step 302 is TIMEi? If it is O, the key press data at this time is assigned to the key ring i.

In this electronic musical instrument, as shown in FIG. 12, a tempo clock with a period of 1/24 of one beat is counted by a ternary clock counter QNT, and when this count value QNT changes from 2 to O, n =Q to increments a 64-decimal timing counter CLK that counts 63. In addition, each count value is stored in the pattern register (CLK=n-1, 0NT=2>
The key presses in the interval from (CLK=n, QNT=1>) are written as those at timing CLK=n.

That is, referring to FIG. 7, in step 310, the count filIQNT of the clock counter is checked.

If the count value QNT is 2, in step 311 the timing counter CLK and the previous timing (direct counter 0L
While incrementing DCLK, these count values are stored in temporary buffers T and 0LDT, respectively. Then, in the next steps 312 and 313, if the count value 0LDT exceeds 63, the temporary buffer 0LDT is cleared.

In steps 314 and 315, the temporary buffer T is processed in the same way as the temporary buffer 0LDT. On the other hand, if QNT'-i2 is determined in step 310, then in step 316, the count values of the timing counter CLK and the previous timing value counter 0LDCLK are stored in temporary buffer 7 and 0LDT, respectively (without incrementing). 320.

In step 320, the key code of the currently pressed key is stored in the programming key code buffer KC1 for use in channel scanning at 111 m. Next, step 32
When 1, timer T[MEi is 0 indicating that channel 1 key is being pressed.
After setting the temporary buffer 0 in step 322
Using LDT and T as pointers [0LDT] and [T], rest data O and the above key code are respectively written to the addresses designated by each pointer in the pattern register. As a result, the previous event becomes a rest and the current event becomes a key code at the current timing position [T] of the pattern register [key press start J information has been input/extracted. Furthermore, in step 323, the key code K is
Tone generator 1 in channel i by Ci
8 key on place! ! (processing to start sounding using the current key code) and return to the original routine (step 212 in Figure 6).
Return to

4. Key Release 1 Input Processing FIG. 8 shows the key release writing processing (step 400) routine of FIG.

Referring to FIG. 8, in step 401, one of the programming key code buffers KC+ to KC3 is searched for KCi which stores the same key code as the key code of the key that has just been released. Next, in step 402, the timing counter CL
The contents of K are stored in the temporary buffer king, and in step 403 the old information stored at address [T]i is stored in the temporary buffer T.
In addition to storing it in the EMP, new information (a rest) indicating "end of key press" is stored in this address [T]i. Next, in step 404, the tone generator 18 on channel i is keyed off (processing to stop sound generation using the currently released key code), in step 405, the key code buffer KCi is cleared to enter the key-off state, and in step 406, channel i is turned off. After setting the timer TIMEi to 128, which is data indicating that the key has been released,
The process moves to step 408.

In step 408, it is determined whether the old information TEMP is 0 (rest). If the old information TEMP is a rest, the process returns to the original routine (step 220 in FIG. 6).

On the other hand, if the old information TEMP is other than a rest (', 0),
If this continues, when performing automatic accompaniment, the accompaniment sound based on the old information will occur immediately after the 11th key of the new information in the part that has been rewritten with the new information (overlapping), which will be unnatural, so step 410 ~
In step 413, as shown in FIG. 13, the entire period between the key release information of the new information B and the key release information of the old information A is found is erased and turned into a rest.

That is, referring to FIG. 8, the timing T is incremented in step 410, and it is determined in step 411 whether or not the timing value exceeds 63. Pattern data writing range (0
-63), the process returns to the original routine (step 220 in FIG. 6).

If it is 63 or less, it is determined in the next step 413 whether the old information written at address [T]1 is a rest. If it is a rest, the original routine (
Return to step 220) in FIG. This means that even if the old information is new, it is written with at least one rest after the 111th key, that is, a note with a clear rising edge (the first
C) in Figure 3 is intended to be left as is with emphasis on its rise. On the other hand, if the data at address [T3i is not a rest, then after loading rest data there, step 41
Return to 0.

5. Automatic accompaniment processing Referring to FIG. 5, in step 110, the keyboard circuit 10
, and determines whether a new key press has occurred. If there is a new key press, it is determined in step 111 whether the new key press is an accompaniment key. As a result of the determination in step 111, if the pressed key is an accompaniment key, the chord (root note and chord type) is detected in step 112, while if it is not an accompaniment key, the pressed key sound is detected in step 113. The tone generator 18 is controlled by the high setting, and the tone generator 18 is generated in accordance with the key depression. Also,
If the determination in step 110 is "no new key pressed", the process proceeds to step 114 without performing steps 111 to 113. In step 114, the timbre selection switch 4 of the switch group 16 is scanned to detect the switch information, and after sending the timbre information to the tone generator 18, the process moves to step 120.

6, '13 Affil! I! As mentioned above, in the electronic musical instrument shown in FIG. 1, the following interrupt processing (step 500) is performed using the tempo clock generated from the tempo generator 17 at a timing of 1/24 of one beat (quarter note) as an interrupt signal. Execute.

In FIG. 9, in step 501, the run flag RUN
Inspect. If the flag RUN is O'', then the timing counter CLK and the clock counter QN are set in step 501 because the accompaniment pattern is not being created or automatic accompaniment is being performed.
Clear T and set the previous timing value counter 0LDCL
After setting K to -1, cancel the interrupt and return to the original routine.

On the other hand, the determination in step 501 is that the run flag RUN=n
If it is I+, this means that an accompaniment pattern is being created or automatic accompaniment is being performed. In this case, the contents of the clock counter QNT are checked in step 503.

If the content of the counter QNT is 0 in step 504, channel number i is set to 1, and step 6
00 channel-specific processing is executed.

1. Processing by channel In FIG. 10, in steps 601 and 602,
Check the contents of timer TIMEi. Timer content TI
If MEi is 0, this channel i is currently being pressed in the program mode, so step 601
The process moves to step 603 and the key code K based on the currently pressed key is entered.
Ci is stored at the address [CLK] indicated by the timing counter CLK of the pattern register. This storage process is 1
This is performed every time there is an interrupt until IIIt11, and as a result, the key code KCi is stored in the pattern register at each address corresponding to the timing from key press to key release.

If the timer content TIMEi is 255, channel i is an empty channel, and the process returns to the original processing routine (step 505 in FIG. 9) via step 602.

Furthermore, if the timer content TIMEi is neither O nor 255, the pattern select switch 2
Alternatively, the combination of the current event data [CLK] i and the previous event data [0LDCLK] i is checked for the pattern selected by the Yuji pattern switch 6 (the successive pointer is set in step 121 in FIG. 5), and Processing is performed according to the meaning of the combination. These combinations and their meanings are shown in Table 1.

Table 1 [CLK] [0LDCLK] Meaning (processing) OO
Rest O platform O key on (Q o key off jealousy 0
+0 Key-on medium low, O: Rest NO: Key code If the combination of the above event data means a rest or key-on, proceed to step 61°, increment the contents of timer TIMEi, and then The process returns to the original processing routine (step 505 in FIG. 9).

If the key is off, the process moves to step 620 to execute tone generator key-off processing on channel 1, and after setting the content of timer TIMEi to 128 in step 621, the original processing routine (step 5 in FIG. 9) is executed.
Return to 05).

If the key is on, the process moves to step 630 to execute key-on processing for the tone generator on channel i, and in step 640 the content of the timer TIME+ is set to 1. After completion, the original processing routine (step 505 in FIG. 9) is executed.
).

8. Key-on processing FIG. 11 shows details of the key-on processing (step 63o). In step 631 of the same figure, in order to normalize the sound to be produced, the current event data [CLK]i is read out from the pattern memory 15 and stored in the albesic code register KEY. In step 632, the note code NC of the key code KEY is calculated, and the temporary buffer N0
Store in TE. As shown in Figure 3, the key code KC for each key is an integer multiple of 12, and a higher value is assigned for each semitone higher, and the note code N
Since C is assigned a value between O and 11, where C is O and the semitone interval is 1, the note code NC is the key code K.
It can be determined as the remainder when C is divided by 12.

In the following step 633, the note code N0 is determined by referring to the key code conversion table (FIG. 14) formed in a part of the program memory 13 or pattern memory 15.
TE and (stored in step 112 of FIG. 5)
The pitch correction value for the chord type CHORD is read and stored in the temporary buffer DLT. In step 634, the key code KEY in the register KEY is changed to the pitch correction value DLT.
Add and correct. In step 635, the register KEY
The pitch of the key code KEY is corrected by further adding the root note name data ROOT to the key code KEY in the key code KEY. Since the accompaniment pattern is written in C major, the modification in step 634 is performed to change from major to another chord type, and the modification in step 635 is performed to change the root note to a note other than C. It is. At step 636, key-on processing is performed on the tone generator 18 using the key code KEY thus adjusted to the actual pitch for channel i, and then the process returns to the original processing routine (step 640 in FIG. 10). From step 640 in FIG. 10, the process returns to step 505 in FIG.

9. Processing (continued) Referring to FIG. 9, in step 505, channel number i is incremented. In step 506, it is determined whether the incremented channel number i exceeds 3 or not.

If the channel number i is 3 or less, channel processing (step 600) has not yet been performed for channel i, and the process returns to step 800 to execute channel processing i. On the other hand, if the incremented channel number i exceeds 3, it means that channel processing has been completed for all channels 1 to 3, and the process moves to step 510.

In step 510, the clock counter QNT is incremented (updated), and in step 511, it is determined whether the count value of the counter QNT exceeds 2 or not. Counter QNT is 0 to 2
Since it is a ternary counter that counts , if the counted value is 2 or less, the interrupt is canceled and the original routine is returned to. On the other hand, if it exceeds 2, the counter QNT is O~2
Since we have finished counting one period of
2 clears the counter QNT and at step 51
In step 3, store the contents of the timing counter CLK in the previous timing value counter 0LDCLK, and then store the contents of the timing counter CLK in the previous timing value counter 0LDCLK.
advances (updates). In step 514, the counter CL
It is determined whether or not the counted value of K has exceeded 63. If it has not exceeded 63, it remains as is; if it has, the counter CLK is cleared in step 515, the interrupt is canceled, and the original routine is returned.

[Modifications of Embodiments] Note that the present invention is not limited to the above-described embodiments, and can be implemented with appropriate modifications. For example, in the above embodiment, a case was described in which a four-beat accompaniment pattern was created and automatically played, but the timing counter GLK may be operated between O-47 and O-31 for three- and two-beat accompaniment patterns, respectively. It is clear that it can be implemented in the same way as in the case of four beats. Further, in the above description, only one set of user pattern registers (memories) is provided, but it is also possible to provide a plurality of registers (memories). Also, the root notes are set as O~11 from C to B,
Lower G to B by 1 octave and lower G to F# by -5
~+6, transposition using the root note may be performed.

Furthermore, since the above-mentioned electronic musical instrument is controlled by a tempo clock, it is also possible to provide a rhythm pattern and generate rhythm sounds in synchronization with the automatic accompaniment. Furthermore, as the code input method, any method such as finger mode or single finger mode can be adopted.

[Effects of the Invention] As described above, according to the present invention, the timing of key presses, +m keys, etc. of accompaniment played in accordance with a predetermined tempo is detected in real time and stored in memory, so that automatic Creating original patterns for accompaniment has become very easy.

[Brief explanation of drawings]

FIG. 1 shows an operation surface I of an electronic musical instrument according to an embodiment of the present invention.
Figure 2 is a block diagram showing the hardware configuration of the instrument shown in Figure 1, Figure 3 is a correspondence diagram of the keys and key codes of the instrument shown in Figure 1, and Figure 4 is a diagram showing the correspondence between the keys and key codes of the instrument shown in Figure 1. A configuration diagram of a pattern memory in a musical instrument, Figures 5 to 11 are 70-
Figure 12 is an explanatory diagram of the timing detection operation in the instrument in Figure M1, Figure 13 is an explanatory diagram of the overwriting operation in the instrument in Figure 1, and Figure 14 is the key code conversion table in memory. FIG. 1: Keyboard, 2: Pattern select L-switch, 5 Niprogram switch, 6: User pattern select switch, 7: Clear switch, 8: Transfer switch, 10: Keyboard circuit, it: CPU. 13: Niprogram memory, 14: Working memory, 15: Pattern memory, 16: Switch group, 17: Tempo generator, 18: Tone generator. Patent applicant Nippon Gakki Mfg. Co., Ltd. Attorney Patent attorney Tatsuo Ito Attorney Patent attorney Tetsuya Ito Then TO's N-on person yuri. Flow ÷ Eile Figure 11 - Cor V - Missing Nade 1 Figure 14

Claims (1)

[Claims] 1. In an electronic musical instrument equipped with an automatic accompaniment device that repeatedly plays a limited accompaniment pattern in a certain range while changing it based on chord information, a program mode setting means is provided, and a program mode setting means is provided. means for detecting the generation timing of key information relative to a predetermined performance tempo; a rewritable memory means; means for writing the key information and generation timing information into the memory as accompaniment pattern information; Automatic accompaniment characterized by being provided with means for reading out accompaniment pattern information written in the memory in place of accompaniment pattern information limited to a certain range, so that a pattern to be played can be created in real time using keys. Electronic musical instruments with equipment.