JPH0774951B2 - Electronic musical instrument with automatic accompaniment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in the following order.

BACKGROUND OF THE INVENTION Field of the Invention Outline of the Invention Conventional Technology Problems to be Solved by the Invention and Means for Solving the Embodiment Example of Configuration of Electronic Musical Instrument of FIG. 1 Operational Description of Electronic Musical Instrument of FIG. 1. Main Processing (FIG. 5) ) 2. Program processing (Fig. 6) 3. Key press writing process (Fig. 7) 4. Key release writing process (Fig. 8) 5. Automatic accompaniment process 6. Interruption process (Fig. 9) 7 . Channel-specific processing (Fig. 10) 8. Key-on processing (Fig. 11) 9. Interrupt processing (continued) Effect of the invention [Industrial application] This invention is a pattern unique to the performer. The present invention relates to an electronic musical instrument with an automatic accompaniment device capable of performing automatic accompaniment.

SUMMARY OF THE INVENTION The present invention relates to an electronic musical instrument with an automatic accompaniment function, which is capable of automatically detecting the key depression timing of each depressed key in the keyboard accompaniment, and rewriting the information of this key depression timing and the depressed key. By storing the desired accompaniment pattern in the memory, the pitch of the accompaniment pattern is controlled according to the accompaniment performance of the performer when the accompaniment pattern is read out and the automatic accompaniment is performed. .

[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 albejo or arpeggio chord (plural note arpeggio),
It is known that the pitch is changed according to the chord information input from the keyboard to change the pitch and generate a sound (automatic accompaniment).

However, such an automatic accompaniment is merely the reproduction of a pattern stored in advance and is not always satisfactory for 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 can create and play an original pattern by a simple method.

In order to achieve the above object, the present invention detects the generation timing of key information by keyboard operation with reference to a predetermined playing tempo, stores the key information and the generation timing information in a rewritable memory, and The information read out from the memory at the time of performance is selected as accompaniment pattern information, and the pitch of the accompaniment pattern can be controlled according to the accompaniment performance of the performer. This allows the performer to create a pattern suitable for his performance,
During the automatic accompaniment, the pitch can be appropriately controlled by the accompaniment performance. 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.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

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

1. Description of the configuration of the electronic musical instrument of FIG. 1. On the operation surface of FIG. 1, one of the keyboards 1 for playing a melody and one of the existing accompaniment patterns in the read-only memory is shown.
In addition to switches common to conventional electronic musical instruments, such as a pattern select switch 2 for selecting one, a run / stop switch 3 for selecting execution / stop of automatic accompaniment, and a tone color select switch, a program mode ( Program switch 5 for selecting accompaniment pattern creation mode), user pattern switch 6 for selecting a user pattern that is a pattern created by the program mode as an accompaniment pattern during automatic accompaniment, and a user pattern collectively in the program mode A clear switch 7 for erasing, a transfer switch 8 for temporarily copying a desired accompaniment pattern as a user pattern when correcting one of the existing accompaniment patterns to create a user pattern, and a playing tempo for the performer. Every beat (quarter note) Metronome display lamp 9 to light
Are arranged.

FIG. 2 shows a hardware configuration of the electronic musical instrument shown in FIG. In the figure, a keyboard circuit 10 detects a key press on the keyboard 1 (FIG. 1) and generates key information (key code) representing the pressed key. As shown in FIG. 3, this key code corresponds to the positions C ₁ , C # ₁ , D ₁ , ..., B ₁ , C ₂ , ... The multiple of 12, 24, 36, ...
The other keys are assigned numerical values that increase by 1 for each semitone. Further, a rest, that is, a (key) code representing a state where no key is pressed is 0. In the following, numerical data such as a key code is represented by a decimal number unless otherwise specified.

A central processing unit (CPU) 11 is provided with a program memory 13, a working memory 14, a pattern memory 15, and operation switches 2 in addition to the keyboard circuit 10 via a bidirectional bus line 12.
~ 8 (Fig. 1) switch group 16, tempo generator 17
And tone generator (TG) 18 etc. are connected.

The CPU 11 takes in the key information output from the keyboard circuit 10 and the switch information from the switch group 16, and performs predetermined musical tone information (starting sound generation,
It controls the operation of the electronic musical instrument as a whole, such as formation of information such as stop of sound generation, pitch and tone color information) and transmission of this musical tone information to the tone generator 18.

The program memory 13 is composed of a read only memory (ROM) and stores a control program for the CPU 11.

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

QNT: Clock counter Counting tempo clock 0 to 2 CLK: Timing counter Incremented when the count value of QNT is 2 → 0. Count value 0-63 (0-31: each timing in odd measure, 32
~ 63: Each timing in even bar) OLDCLK: Previous timing value register Normal CLK-1, but when CLK = 0 OLDCLK = 63 RUN: Run flag Whether arpegic code is running (= 1) or stopped (= 0) Flags TIME _{1 to} TIME ₃ : Timers are provided for each of the three channels and count the number of clocks from the occurrence of the previous event to the present. However, 255 when there is no event, 0 when the key is on, and +128 is added when the key is off. Further, it is set to 0 during key-on by actual key depression.

As a result, at the time of channel assignment, if the one with the largest TIME value is obtained, the assignment priority can be set in the order of empty channel> oldest key release channel> oldest key press channel.

KC ₁ ~KC _3: key code register program mode for the program, stores the key code in the key-on in KCi of occupied channel i by the fact of the key depression, other KC is O. Used for scanning the key-off channel when releasing the key.

T: CLK buffer OLDT: OLDCLK buffer ROOT: Root name register C, C #, ..., B corresponding to a value of 0 to 11 CHORD: Chord leap register C, C _M7 , Cm, C ₇ , C ₇ SUS ₄ , Cm ₇ , Cm ₇ ^-5 takes a value of 0 to 7 corresponding to DLT, NOTE: Buffer KEY: Arpeggiic code key code register [m] i: Data read pointer In pattern memory 15 For reading data. m = T, OLDT, CLK, O
LDCLK. The pointer [m] i indicates the content of the address m of the tone generation channel i in the pattern No. designated by the pattern select switch (including the user pattern switch 6).

In the following description, each register and the like will be represented by the same label name. For example, both the key code register for arpegic code and its contents are represented by KEY.

As shown in FIG. 4, the pattern memory 15 includes a read-only ROM area in which existing accompaniment patterns (pattern numbers 1 to 12) are stored and a user pattern (pattern number 1).
3) consists of a rewritable RAM area (pattern register) in which is stored. Each pattern area is provided with a 65-byte-long key code storage area for storing accompaniment data (key codes 12 to 84 and rest data 0) for three channels (ch1 to ch3). In these patterns, the address (0 to 63) is the timing counter CLK.
Corresponds to the count value of. That is, the data of each address represents the sounding state of the accompaniment sound such as key depression or key release at the address where the data is stored, that is, the timing.

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

The tone generator 18 has four tone generation channels for accompaniment tone formation, three tone generation channels for melody tone formation, and one tone generation channel for bass tone formation. The tone generator 18 corresponds to tone information given from the CPU 11. (Melody sound, accompaniment sound and bass sound) signal is formed. This tone signal is converted into sound by a sound system (not shown) and is generated.

Description of Operation of Electronic Musical Instrument of FIG. 1 Next, the operation of the electronic musical instrument will be described with reference to the flowcharts of FIGS.

1. Main Processing Referring to FIG. 5, when the electronic musical instrument is powered on, the CPU 11 starts its operation according to the control program stored in the program memory 13 (step 100). In step 101, clock counter QNT, timing counter
CLK, root note name register ROOT, run flag RUN and program key code registers KC _{1 to} KC ₃ are cleared, previous timing value register OLDCLK is set to -1, and timer TIME _{1 to} TIM.
After initializing the entire circuit, such as setting E ₃ to 255, the main processing operation including steps 102 to 121 and step 200 is executed.

In step 102, the program switch 5 in the switch group 16 is inspected to determine the operation mode of this electronic musical instrument. If the switch 5 is in the ON state, the program processing in step 200 (described later) is executed because it is the program mode, while if it is in the OFF state, the automatic accompaniment processing in steps 110 to 114 (described later) is set as the automatic accompaniment mode. After execution, move to step 120. In step 120, the run / stop switch 3 is inspected, and each time the run / stop switch 3 is pressed, the run flag RUN is toggled from "0" to "1" or "1" to "0". In the following step 121, the pattern select switch 2 is scanned to detect the selected pattern (1 to 12) or the pattern register (= pattern 13), and the read pointer [m] i is selected for each channel of the patterns 1 to 13. After performing the pattern select switch processing such as setting to the head address of i, the process returns 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 or not the current time is immediately after the program switch 5 is turned on. If it has just been turned on, the run flag R is set in step 202.
Set UN to "1" to forcibly turn on the run / stop switch 3, clear the root note name register ROOT, set the chord type register CHORD to C major, and set each timer TIME _{1 to} TIME ₃ respectively. Set it to 255 (free channel). If it is not immediately after being turned on, the process of step 202 is not performed, and the process directly proceeds from step 201 to step 203.

In steps 203 and 204, it is determined whether or not the transfer switch 8 is turned on, and if it is on, that is, a new pattern is created while editing any of the existing patterns 1 to 12, it is currently selected. Transfer the accompaniment pattern to the pattern register.

In step 205 and step 206, it is determined whether or not the clear switch 7 is turned on. If it is on, that is, if a new pattern is to be created, the pattern register is all cleared (all rests) and each timer is reset. TI
Set ME _{1 to} TIME ₃ to 255 (empty channels) respectively.

In step 210, the run flag RUN is checked. If the run flag RUN has been reset, this means that the pattern creation has been completed and the run / stop switch 3 has been stopped, so the program processing routine is immediately exited and the main processing (step 120 in FIG. 5) is started. Return to. On the other hand, if the run flag RUN is set, step 211
Move to. In steps 211 and 212, the presence / absence of a key press and a key release is respectively inspected, and if a key press event occurs, a key press writing process (step 300) is executed, and if a key release event occurs, a key release writing process. Execute (step 400). If neither the key depression event nor the key release event has occurred, and if the key depression or key release writing processing has ended in accordance with the occurred key depression or key release event, the flow proceeds to step 220, and chord tone color selection processing is executed. In this electronic musical instrument, the chord tone color select switch is also used as the melody tone color tone select switch 4. In step 220, chord tone information corresponding to the selected state of the tone color select switch 4 is sent to the tone generator 18. It should be noted that interrupts are prohibited during the execution of the above-described key depression writing process (step 300) and key release writing process (step 400).

3. Depressing Key Writing Process FIG. 7 shows details of the key depressing process (step 300) in FIG. This electronic musical instrument is configured so that a maximum of three tones can be simultaneously produced as accompaniment tones, and three channels for tone production and storage are prepared. Therefore, the fourth
If there is a key depression (key on), it is necessary to vacate one of the channels and allocate the key data by this fourth key depression. Here, this key data allocation (key assignment) is assigned to an empty channel if there is an empty channel, to the oldest key release channel if there is no empty channel, and to the oldest key press channel if there is no empty channel or key release channel. Do it. Such a channel is a timer
The contents of TIMEi, that is, the channel with the maximum time value.

Referring to FIG. 7, in step 301, timers TIME _{1 to} TIME
TIMEi having the maximum time count value out of ₃ is searched for, and in the following step 302, it is checked whether the time count value of TIMEi is 0 or not.
If TIMEi = 0, all three channels are key-on by actual key depression. In this case, since the four key depressions have the same priority, the three channels are left as they are and the fourth key depression is ignored. That is, if TIMEi = 0, the key depression at this time is ignored and the process returns to the original routine (step 212 in FIG. 6) without performing any processing. on the other hand,
If the determination in step 302 is TIMEi ≠ 0, channel i
The key depression data at this time is assigned to.

In this electronic musical instrument, as shown in FIG.
Temporal clock with 1/24 cycle ternary clock counter
64-bit timing counter CL that counts with QNT and counts n = 0 to 63 when this count value QNT changes from 2 to 0
Step K. Also, in the pattern register, the key presses in the section of each count value from (CLK = n−1, QNT = 2) to (CLK = n, QNT = 1) are written as those at the timing CLK = n. ing.

That is, referring to FIG. 7, in step 310, the count value QNT of the clock counter is checked. If the count value QNT is 2, in step 311, the value obtained by adding 1 to the previous timing value counter OLDCLK is stored in the buffer OLDT, and the value obtained by adding 1 to the timing counter CLK is stored in the buffer T. Then, in the next steps 312 and 313, the count value OLDT becomes 63.
If it exceeds, clear the buffer OLDT. Step 31
Buffer OLDT for buffer T in 4 and 315
Process as in. On the other hand, in step 310, QNT ≠ 2
If so, after storing the count values of the timing counter CLK and the previous timing value counter OLDCLK in the buffers T and OLDT (without stepping), respectively, in step 316,
Go to step 320.

In step 320, the key code of the current key depression is stored in the program key code buffer KCi for use in channel scanning when releasing the key. Then, at step 321, the timer TI
After setting 0 to MEi, which indicates that channel i is being pressed,
In step 322, the buffers OLDT and T are used as pointers [OLDT] and [T], respectively, and rest data 0 and the key code are written to the addresses designated by the respective counters in the pattern register. This allows
At the current timing position [T] of the pattern register, the previous event becomes a rest, and the [key depression start] information in which the current event is the key code is written. Further, in step 323, key-on processing (tone generation starting processing by the current key code) of the tone generator 18 in the channel i is performed by the key code KCi, and the original routine (step 212 in FIG. 6) is returned to.

4. Key Release Writing Process FIG. 8 shows the key release writing process (step 400) routine of FIG.

Referring to FIG. 8, looking for KCi those same key codes are stored the key code of the key now key release of step 401 the program when the key code buffer KC ₁ ~KC _3. Next, in step 402, the contents of the timing counter CLK are stored in the buffer T, and in step 403 the old information stored in the address [T] i is stored in the buffer TEMP. Store new information (rest) indicating "end of key depression". Then, in step 404, the tone generator 18 is keyed off on the channel i (the tone generation stop processing by the current key release key code), the key code buffer KCi is cleared in step 405, and the key off state is set. After 128, which is data indicating that the key has been released, is set in the timer TIMEi, the process proceeds to step 408.

In step 408, it is determined whether the old information TEMPO is 0 (rest). If the old information TEMP is a rest, it returns to the original routine (step 220 in FIG. 6). On the other hand, old information T
If the EMP is other than a rest (≠ 0), when performing automatic accompaniment as it is, an accompaniment sound due to the old information is generated immediately after the new information is released at the part overwritten (overwritten) with the new information, which is unnatural. Therefore, in steps 410 to 413, as shown in FIG. 13, all the time from the key release of the new information B until the key release information of the old information A is found is erased and rested.

That is, referring to FIG. 8, in step 410, the timing T is incremented, and in step 411, it is determined whether or not the timing T exceeds 63. Pattern data writing range (0 to 63)
If it exceeds, the process returns to the original routine (step 220 in FIG. 6). If 63 or less, next step 4
At 13, it is determined whether the old information written in the address [T] i is a rest. If it is a rest, the process directly returns to the original routine (step 220 in FIG. 6). This is because the old information is written with at least one rest after the new information is released, that is, the sound with a clear rise (C in FIG. 13) is emphasized and left as it is. is there. On the other hand, if the data at address [T] i is not a rest, write rest data there and then
Return to 410.

5. Automatic Accompaniment Processing Referring to FIG. 5, in step 110, the output of the keyboard circuit 10 is fetched and it is determined whether or not a new key depression has occurred.
If there is a new key depression, it is determined in step 111 whether or not the new key depression is an accompaniment key. If the result of determination in step 111 is that the key is pressed by the accompaniment key, the chord (root note and chord type) is detected in step 112, while if not by the accompaniment key,
In step 113, the tone generator 18 is controlled according to the pitch of key depression, and the tone is generated in accordance with the key depression. If the determination in step 110 is “no new key pressed”, the process proceeds to step 144 without performing the processes of steps 111 to 113. In step 114, the tone color select switch 4 of the switch group 16
Is scanned to detect the switch information, the tone color information is sent to the tone generator 18, and then the process proceeds to step 120.

6. Interrupt processing As described above, in the electronic musical instrument of FIG. 1, the following interrupt processing is performed with 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 (step 500).

In FIG. 9, in step 501, the run flag RUN is inspected. If the flag RUN is "0", it means that neither accompaniment pattern is being created nor automatic accompaniment, so in step 502 the timing counter CLK and the clock counter QNT are cleared, the previous timing value counter OLDCLK is set to -1, and then an interrupt is issued. It returns to the original routine even if it is released.

On the other hand, if the judgment in step 501 is the run flag RUN = "1", this means that the accompaniment pattern is being created or the 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, the channel number i is set to 1 and the process for each channel in step 600 is executed.

7. Channel-wise processing In FIG. 10, in step 601, the contents of the timer TIMEi are checked. If the content TIMEi of the timer is 0, this channel i is currently key-depressing in the program mode, so the process moves from step 601 to step 603 and the timing code CLK of the pattern register indicates the key code KCi by the current key-depression. Store at address [CLK]. This storing process is performed every time an interrupt is made until the key is released, whereby the key code KCi is stored in the pattern register at each address corresponding to the timing from key depression to key release. .

If the timer content TIMEi is not 0, step 6
The pattern selected by the pattern select switch 2 or the user pattern switch 6 in 04 (step in FIG. 5
Current event data [CLK] i and previous event data [OLDCLK]
The combination with i is inspected, and the processing according to the meaning indicated by the combination is performed. This combination and its meaning are shown in Table 1.

Table 1 [OLDCUK] [CLK] Meaning (Process) 0 0 Rest 0 ≠ 0 Key-on ≠ 0 0 Key-off ≠ 0 ≠ 0 During key-on, however 0: Rest ≠ 0: Key code Rest of the above event data combination Alternatively, if it means that the key is on, the routine proceeds to step 610, where the content of the timer TIMEi is incremented, and then the routine returns to the original processing routine (step 505 in FIG. 9).

If the key is off, the process proceeds to step 620 to execute the key off process of the tone generator on channel i,
After setting the content of the timer TIMEi to 128 in step 621, the process returns to the original processing routine (step 505 in FIG. 9).

If it is key-on, the process proceeds to step 630 to execute the key-on processing of the tone generator on channel i,
After setting the contents of timer TMIEi to 1 in step 640,
The process returns to the original processing routine (step 505 in FIG. 9).

8. Key-on process FIG. 11 shows the details of the key-on process (step 630). In step 631 of the figure, the current event data [CL
K] i is read and stored in the albegic code register KEY. In step 632, the note code NC of the key code KEY is calculated and stored in the buffer NOTE. As shown in FIG. 3, the key code KC for each key is assigned a larger value for each semitone higher, with the C tone being an integer multiple of 12, and the node code NC, with C being 0 and a semitone interval of 1. Since the values 0 to 11 are assigned, the no-code NC can be obtained as the remainder obtained by dividing the key code KC by 12.

In the following step 633, the node code NOTE and (stored in step 112 of FIG. 5) are referred to with reference to the key code conversion table (FIG. 14) formed in part of the program memory 13 or the pattern memory 15. Code type C
The pitch correction value for HORD is read and stored in the temporary buffer DLT. Key code in register KEY in step 634
Correct by adding pitch correction value DLT to KEY. In step 635, the root note name data ROOT (stored in step 112 of FIG. 5) is added to the key code KEY in the register KEY to correct the pitch of the key code KEY. Since the accompaniment pattern is written in the C major, the modification in step 634 is made to change from the major to another chord type.
Further, in order to change the root note to a note other than C, step 635 is modified. In step 636, the key code KEY thus corrected to the actual pitch for channel i
After key-on processing of tone generator 18 with,
Return to the original processing routine (step 640 in FIG. 10). First
From step 640 in FIG. 0, the process returns to step 505 in FIG.

9. Interrupt processing (continued) Referring to FIG. 9, in step 505, channel number i
Step forward. In step 506, it is determined whether the stepped channel number i exceeds 3. If the channel number i is 3 or less, the channel processing (step 600) has not yet been performed for the channel i, and therefore the processing returns to step 600 to execute the channel processing. On the other hand, if the incremented channel number i exceeds 3, it means that the channel processing has been completed for all the channels 1 to 3, so that the process proceeds to step 510.

In step 510, the clock counter QNT is incremented (updated)
Then, in step 511, it is determined whether or not the count value of the counter QNT exceeds 2. Counter QNT counts 0 to 2 3
Since it is a progressive counter, if the count value is 2 or less, the interrupt is canceled and the routine returns. on the other hand,
If it exceeds 2, the counter QNT has finished counting one cycle of 0 to 2. Therefore, the counter QNT is cleared in step 512 and the timing counter C in step 513.
The contents of LK are stored in the previous timing value counter OLDCLK, and then the counter CLK is incremented (updated). In step 514, it is determined whether or not the count value of the counter CLK exceeds 63. If it does not exceed 63, the counter CLK is cleared. If it exceeds, the counter CLK is cleared in step 515, and then the interrupt returns to the original routine. To do.

[Modifications of the Embodiment] The present invention is not limited to the above-described embodiments and can be implemented by being modified appropriately. For example, in the above-described embodiment, the case where the accompaniment pattern of four beats is created and automatically played is described, but the timing counter CLK is 0 to 47 and 0 to 3 in the case of 3 and 2 beats, respectively.
Obviously, if it is operated during 1, it can be implemented in the same manner as in the case of quadrupling. Further, in the above description, only one set of user pattern registers (memory) is provided, but it is also possible to provide more than one. The root note is 0 to 11 from C to B, but G to B
May be lowered by one octave from G to F # to be -5 to +6, and transposition by the root note may be performed. Further, since the electronic musical instrument described above is controlled in operation by the tempo clock, it is possible to provide a rhythm pattern and generate a rhythm sound in synchronization with the automatic accompaniment. Further, as a code input method, any method such as a single finger mode other than fingered can be adopted.

EFFECTS OF THE INVENTION As described above, according to the present invention, since the timing of key pressing, key releasing, etc. of an accompaniment played in accordance with a predetermined tempo is stored in the memory, the original for automatic accompaniment is stored. Creating patterns has never been easier.

Furthermore, according to the present invention, the pitch of the accompaniment pattern is controlled in response to the accompaniment performance of the performer when the accompaniment pattern is read and automatic accompaniment is performed.
Perform with a wide variety of automatic accompaniment.

[Brief description of drawings]

FIG. 1 is a schematic view of an operating surface of an electronic musical instrument according to an embodiment of the present invention, FIG. 2 is a block diagram showing a hardware configuration of the musical instrument of FIG. 1, and FIG. 3 is a key in the musical instrument of FIG. 4 and FIG. 4 is a flow chart for explaining the operation of the musical instrument of FIG. 1, and FIG. 12 is FIG. 1 FIG. 13 is an explanatory view of a timing detecting operation in the musical instrument of FIG. 13, FIG. 13 is an explanatory view of an overwriting operation in the musical instrument of FIG. 1, and FIG. 14 is a configuration diagram of a key code conversion table in the memory. 1: Keyboard, 2: Pattern select switch, 5: Program switch, 6: User pattern select switch, 7: Clear switch, 8: Transfer switch, 10: Keyboard circuit, 11: CPU, 13: Program memory, 14: Working memory , 15: pattern memory, 16: switch group, 17: tempo generator, 18: tone generator.

Claims (1)

[Claims] 1. An electronic musical instrument with an automatic accompaniment device which repeatedly reads out a limited accompaniment pattern within a certain range and generates an automatic accompaniment sound according to the read accompaniment pattern, for setting a program mode or an automatic accompaniment mode. A mode setting means, a plurality of keys for the performer to perform a performance operation, a keyboard for generating key information including pitch information corresponding to the key operation according to the key operation, and a key operation for the above keys in sequence. Detecting means for detecting the generation timing of the key information with respect to a predetermined playing tempo, rewritable memory means, reading means for repeatedly reading the accompaniment pattern information stored in the memory means, and the memory means Accompaniment pattern for changing and controlling pitch information included in the accompaniment pattern information read from the keyboard in accordance with chord information output from the keyboard. A pitch change control means and an accompaniment sound generation means, and when the automatic accompaniment mode is set by the mode setting means, at a timing designated by the accompaniment pattern information read from the memory means, and At the pitch controlled by the accompaniment pattern pitch change control means,
A musical tone is generated for automatic accompaniment, and a writing means for executing the processing of writing the generation timing of the key information and its pitch information as accompaniment pattern information in the memory means, and a program mode by the mode setting means. When set, by performing the accompaniment pattern information reading process by the reading unit and the accompaniment pattern information writing process by the writing unit in parallel,
Means for writing to the memory means accompaniment pattern information corresponding to the generation timing of the key information while repeatedly generating an automatic accompaniment sound according to the accompaniment pattern information read from the memory means, and the mode setting means When the program mode is set by, the electronic musical instrument with an automatic accompaniment device is characterized in that the accompaniment pattern can be sequentially rewritten in real time while the automatic accompaniment sound is generated.