JPH05100674A - Electronic musical instrument - Google Patents

Abstract

PURPOSE:To avoid a feeling of unnaturalness to a player and audience by preventing a musical sound from abruptly varying even if a keying state is detected after automatic performance is started. CONSTITUTION:The electronic musical instrument which is equipped with a keyboard 7 consisting of plural keys and has an automatic accompaniment function is provided with a CPU 2 which gradually decreases the sound volume of the automatic performance when the player presses one key on the keyboard 7 during the automatic performance and then gradually increases the sound volume of the automatic performance during a specific time after the final keying state of the keyboard 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic musical instrument having an automatic accompaniment function.

[0002]

2. Description of the Related Art In a conventional electronic musical instrument having an automatic accompaniment function, the volume of the automatic accompaniment is controlled when a key depression state is detected after starting the automatic accompaniment.

[0003]

By the way, in the above-mentioned conventional electronic musical instrument, when the key-depressed state is detected after the automatic accompaniment is started, the volume or the like is immediately changed. There is a drawback in that the musical sound changes abruptly before and after the detection of, which gives an unnatural feeling to the performer and the audience. The present invention has been made under such a background, and an object of the present invention is to provide an electronic musical instrument in which a musical tone does not suddenly change even if a key-depressed state is detected after automatic accompaniment has started. To do.

[0004]

An electronic musical instrument according to the present invention is provided with a keyboard consisting of a plurality of keys, and has an automatic accompaniment function. When a key is pressed, a control means is provided for immediately or gradually decreasing the volume of the automatic accompaniment, and gradually returning the volume of the automatic accompaniment after a lapse of a predetermined time from the last key depression state of the keyboard. It is characterized by doing.

[0005]

According to the above construction, when one of the keys on the keyboard is depressed by the performer during the automatic accompaniment, the control means immediately or gradually lowers the automatic accompaniment. And
The control means restores the volume of the automatic accompaniment at a constant rate after a lapse of a predetermined time from the last key depression state of the keyboard by the performer.

[0006]

First, a first embodiment of the present invention will be described. In this embodiment, as shown in FIG. 11, when a key in the right range of the keyboard is pressed during automatic accompaniment (FIG. 11A) (FIG. 11B), the automatic accompaniment is immediately muted. , A predetermined rate (for example, 1 beat) after a predetermined time (for example, 2 beats) has elapsed since the last key in the right key area was pressed.
The automatic accompaniment is returned at 1 level every 16 beats. As a result, even if the key-depressed state is detected after the automatic accompaniment is started, the musical sound does not change abruptly.

A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an electronic musical instrument according to the first embodiment of the present invention. In this figure, 1 is a microcomputer. In this microcomputer 1, 2 is a CPU (central processing unit) that controls each part of the device, and 3 is a tempo clock generation circuit that generates a tempo clock, and each time a preset time elapses (for example, 1/16 beats). Every,
An interrupt pulse is supplied to the CPU1. 4 is a CPU
RO in which the control program used in 2 is stored
It is a program memory consisting of M.

Reference numeral 5 is a working memory composed of a RAM in which various registers and flags used when the CPU 2 performs various processes are secured. The working memory 5 is provided with the table shown in FIG. 2 for each style which is a type of automatic accompaniment such as rock and waltz. In FIG. 2, TRK is a track, tracks 0 to 5 are chords, tracks 6 are bass sounds, and tracks 7 are
Percussion instrument sounds (rhythm sounds) are assigned to 9 to 9, respectively. Then, for each track, the mute level MT
LD, mute delay MTDD, and offset volume OVLD are set respectively. The mute level MTLD is a volume level that is lowered by mute in response to the pressing of a key in the right key range. FF _H (FF _H is 16
Indicates a decimal number. The same applies hereinafter. ) Means completely silent. Mute delay MTDD
Is the number of beats from when the last key in the right range is pressed until the mute is restored. Offset volume OV
LD is a volume offset value that is a balance of volume.

Further, 6 is an accompaniment data memory consisting of a ROM, and accompaniment patterns for two measures are stored for each track. The accompaniment pattern is a key code to be sounded at each timing, a rhythm type and a sounding. It is composed of data FF _{H and the} like indicating that it is not performed. Reference numeral 7 denotes a keyboard composed of a plurality of keys, which is composed of a left keyboard area 7a which is a keyboard area for accompaniment and a right keyboard area 7b which is a keyboard area for playing a normal melody or the like. Reference numeral 8 denotes a key depression detection circuit that detects that a key on the keyboard 7 has been operated and outputs key information corresponding to the key.

In addition, reference numeral 9 denotes an operation panel, which comprises a master volume 9a for controlling the volume, an automatic accompaniment start switch 9b, an automatic accompaniment stop switch 9c, a style switch 9d and the like. The function of each switch will be described later. Reference numeral 10 denotes a switch operation detection circuit that detects that each switch of the operation panel 9 has been operated and outputs operation information corresponding to each switch. Reference numeral 11 is a tone signal forming circuit which is controlled by the CPU 2 and outputs a tone signal, 12 is an amplifier which amplifies the tone signal output from the tone signal forming circuit 11, and 13 is a speaker which converts the output signal of the amplifier 12 into a tone. ..

The operation of the CPU 2 having such a configuration will be described with reference to the flow charts of FIGS. When the electronic musical instrument of FIG. 1 is powered on, the CPU 2
First, the process proceeds to step SA1 of the main routine of FIG. 3 to initialize each part of the apparatus. This initial setting is to set an initial tone color to the tone signal forming circuit 11 and to clear various registers of the working memory 5. Then, the CPU 2 proceeds to step SA2.

At step SA2, it is determined whether or not there is a key event, that is, whether or not any key on the keyboard 7 is depressed or released by the operator and the depressed key detection circuit 8 detects the event. to decide. This judgment result is "Y
In the case of "ES", the process proceeds to step SA3.

At step SA3, a key event process that is performed when any key on the keyboard 7 is depressed or released. The routine of this process is shown in FIG. In this routine, in step SB1, it is determined whether or not the flag RUN, which is set to 1 when the automatic accompaniment is playing, is set to 1. This judgment result is "YE
If "S", that is, if the flag RUN is set to 1, the process proceeds to step SB2.

In step SB2, it is determined whether or not the key in which the event has been detected exists in the right key area 7b. If this determination result is “NO”, that is, if the key in which the event is detected exists in the left key area 7a, step SB
Go to 3. In step SB3, the chord is detected, the root chord code of the detected chord is stored in the register RT that stores the root chord code of the chord, and the detected chord type code is stored in the register TP that stores the chord type code. After that, the process returns to the main routine of FIG. 3 and proceeds to step SA4.

On the other hand, if the determination result of step SB2 is "YES", that is, if the key in which the event has been detected exists in the right key area 7b, the process proceeds to step SB4. If the result of the determination in step SB1 is "NO", that is, the automatic accompaniment is in the stopped state, and the flag RU
Even if N is reset to 0, step SB4
Go to.

In step SB4, it is determined whether the detected event is an on event. If the result of this determination is "NO", the flow proceeds to step SB5. In step SB5, after the key-off process (silence process) of the corresponding key is performed, the process returns to the main routine of FIG. 3 and proceeds to step SA4.

On the other hand, if the determination result of step SB4 is "YES", that is, if the detected event is an on-event, the process proceeds to step SB6. In step SB6, the key-on process (sound generation process) of the corresponding key is performed, and then the process proceeds to step SB7. In step SB7, the value of the count register CT that counts the elapsed time (beats) since any key in the right keyboard area 7b of the keyboard 7 is pressed is cleared to 0, and then the process returns to the main routine of FIG. , Step SA4 is proceeded to.

In the main routine of FIG. 3, in step SA4, it is determined whether or not there is a switch event, that is, the operator operates any switch of the operation panel 9, and the switch operation detection circuit 10 detects the event. Determine whether or not. If the result of this determination is "NO", the flow returns to step SA2. On the other hand, step SA4
If the result of the determination is "YES", that is, if there is a switch event, the process proceeds to step SA5.

At step SA5, a switch event process that is performed when any switch on the operation panel 9 is operated is performed. The routine of this process is shown in FIG. In this routine, in step SC1, it is determined which of the style switch 9d, the start switch 9b, the stop switch 9c and the master volume 9a of the operation panel 9 has been operated. Then, the process proceeds to any of the following steps SC2, SC5, SC7 and SC8 according to each switch. First, when the style switch 9d in FIG. 1 is operated, the process proceeds to step SC2.

In step SC2, the style number corresponding to the style switch 9d operated by the operator is stored in the style number register STLN, and then the process proceeds to step SC3. At step SC3, the register VOLV (i) in which the offset value centered on the value of the master volume of each current track (i = 0 to 9) is stored is shown in FIG.
The value of the offset volume OVLD set in advance is stored in the table shown in FIG. Where STLT
BL means a style table, and STLN means a style number. And CPU2
Proceeds to step SC4. In step SC4, after the value of the count register CT is cleared to 0, the process returns to the main routine of FIG. 3 and returns to step SA2.

When the start switch 9b shown in FIG. 1 is operated, the process proceeds to step SC5. Step SC
In step 5, after setting the flag RUN to 1, step S
Proceed to C6. At step SC6, after clearing the value of the register CLK in which the value of the tempo clock is stored to 0 and the value of the count register CT to 0,
It returns to the main routine of FIG. 3, and returns to step SA2.

When the stop switch 9c shown in FIG. 1 is operated, the process proceeds to step SC7. Step SC
At 7, after resetting the flag RUN to 0, the process returns to the main routine of FIG. 3 and returns to step SA2.

When the master volume 9a shown in FIG. 1 is operated, the process proceeds to step SC8. The processing of steps SC8 to SC10 shown below is performed for the following reason. That is, the value sequentially stored in the register VOLV (i) is an offset value centered on the value of the master volume 9a, but when muting is performed, the volume level needs to be 0. In this case, the value of the master volume 9a to which the sign (-) is added is stored as the offset value in the register VOLV (i). However, each time the operator operates the master volume 9a, the offset value for muting changes, so the value of the master volume 9a is stored in the processing of steps SC8 to SC10.

At step SC8, the value of the register VLM for storing the current value of the master volume 9a is changed to the register OLD for storing the previous value of the master volume 9a.
After storing in, proceed to step SC9. Step SC9
Then, after the value of the master volume 9a operated by the operator is stored in the register VLM, the process proceeds to step SC10.

At step SC10, the value stored in the register VLM with a (-) sign is stored in the register VOLV (k) in which the current offset value of the master volume of each track is stored. Where k is
It means a value such that VOLV (k) =-OLD. To perform this processing, in order to mute at the previous stage, if the value stored in the register VLM with a sign (-) is stored in the register VOLV (k), it is muted now. However, it is not completely muted.
Then, the CPU 2 proceeds to step SC11. In step SC11, the value of the register VLM is output to the tone signal forming circuit 11, and then the process returns to the main routine of FIG. 3 and returns to step SA2.

Next, the interrupt processing of the CPU 2 will be described with reference to the flowcharts of FIGS. This interrupt processing is executed by the interrupt pulse supplied from the tempo clock generating circuit 3 of FIG. 1 every 1/16 beat. In step SD1 of FIG. 6, it is determined whether the flag RUN is set to 1.
If the result of this determination is "NO", nothing is done and
Return to the main routine of.

On the other hand, if the determination result of step SD1 is "YES", that is, if the flag RUN is set to 1, the process proceeds to step SD2. At step SD2, the register TR in which the track number is stored
After storing 0, which is the first track in the chord track, in step SD3. At step SD3, a reproduction process for reproducing each track is performed. Details of this reproduction processing will be described later. Then, when this reproduction process ends, the CPU 2 proceeds to step SD4.

At step SD4, the value of the register TR is incremented by 1, and then the process proceeds to step SD5. In step SD5, it is determined whether or not the value of the register TR is 9 or more, that is, whether or not the processing in step SD3 described above has been completed for all tracks. If the result of this determination is "NO", the flow returns to step SD3.

On the other hand, if the determination result of step SD5 is "YES", that is, if the value of the register TR is 9 or more and the processing of step SD3 described above is completed for all tracks, the process proceeds to step SD6. .. At step SD6, a count process for incrementing the values of the registers CLK and CT is performed. The details of this counting process will be described later. Then, when this counting process is completed, the CPU 2 returns to the main routine of FIG.

Next, the reproduction process of the CPU 2 will be described with reference to FIGS.
This will be described based on the flowchart of FIG. When the processing of the CPU 2 proceeds to step SD3 of FIG. 6, the reproduction processing routine shown in FIG. 7 is started. First, the CPU 2 proceeds to the process of step SE1 and performs a mute process for calculating the mute volume level. The routine of this processing is shown in FIG. In this routine, in step SF1, the value of the count register CT is the style number ST shown in FIG.
Track number T of LN style table STLTBL
It is determined whether or not the value is equal to or larger than the value of the R mute delay MTDD. That is, it is determined whether or not the time to release the mute has been reached. If the result of this determination is "NO", then the operation proceeds to step SF2.

At step SF2, the style number STL is entered.
Track number TR of N style table STLTBL
It is determined whether or not the mute level MTLD of FF is FF _H, that is, whether the mute level is completely muted or the level is simply lowered. If the result of this determination is "NO", then the operation proceeds to step SF3. In step SF3, the value stored in the register VLM with a sign (-) is stored in the register VOLV (TR), and then the process returns to the reproduction processing routine of FIG. 7 and proceeds to step SE2.

[0032] On the other hand, if the judgment result of step SF2 is "YES", that is, when the mute level MTLD track number TR style table STLTBL style number STLN is FF _H, the process proceeds to step SF4. In step SF4, the register VOL
After storing a value obtained by adding the value of the offset volume OVLD of the track number TR of the style table STLTBL of the style number STLN and the value of the mute level MTLD to V (TR), the process returns to the reproduction processing routine of FIG. 7, and step SE2 Go to.

Further, the judgment result of step SF1 is "YE
S ”, that is, the value of the count register CT is
Style table STLTBL with style number STLN
If the value is equal to or more than the value of the mute delay MTDD of the track number TR, the process proceeds to step SF5. Step S
In F5, the value of the register VOLV (TR) is incremented by 1, and then the process proceeds to step SF6.

At step SF6, the register VOLV
It is determined whether or not the value of (TR) is greater than or equal to the value of the offset volume OVLD of the track number TR of the style table STLTBL of the style number STLN. If the result of this determination is "NO", nothing is done and the process returns to the reproduction processing routine of FIG. 7 and proceeds to step SE2. On the other hand, if the determination result of step SF6 is "YES", that is, if the value of the register VOLV (TR) is equal to or greater than the value of the offset volume OVLD of the track number TR of the style table STLTBL of the style number STLN, the step Proceed to SF7. At step SF7, the style number STL is stored in the register VOLV (TR).
Track number TR of N style table STLTBL
After the value of the offset volume OVLD of is stored, the process returns to the reproduction processing routine of FIG. 7 and proceeds to step SE2.

In step SE2 of FIG. 7, each data of the accompaniment pattern is read from the accompaniment data memory 6 based on the data stored in each of the style register STLN, the track register TR and the tempo clock register CLK, and the key code is set. After storing in the register KC, the process proceeds to step SE3. In step SE3, it is determined whether or not the key code stored in the register KC is the data FF _H indicating that no sound is produced. If the result of this determination is "NO", nothing is done and the process returns to the interrupt processing routine of FIG. 6 and proceeds to step SD4. On the other hand, the judgment result of step SE3 is "YES".
In the case of, that is, when the key code stored in the register KC is not the data FF _H indicating that no sound is produced, the process proceeds to step SE4.

At step SE4, note data processing is performed. The routine of this process is shown in FIG. In this routine, in step SG1, the register VOLV (T
It is determined whether or not the value stored in the register VLM with a sign (-) is stored in R). If the result of this determination is "NO", nothing is done and the process returns to the interrupt process routine of FIG. 6 through the reproduction process routine of FIG. 7 and proceeds to step SD4.

On the other hand, when the result of the determination in step SG1 is "YES", that is, the register VOLV (T
If the value stored in the register VLM with a sign of (-) is not stored in R), step SG
Go to 2. At step SG2, the value of the register TR is 6
It is determined whether the following is true, that is, whether the track is a chord or a bass note. This judgment result is "Y
In the case of "ES", the process proceeds to step SG3.

At step SG3, the key code stored in the register KC is determined by the chord root code stored in the register RT and the track number stored in the register TR using a chord conversion table or a bass conversion table (not shown). Convert and convert the key code to register K
After storing in C, the process proceeds to step SG4. On the other hand, when the result of the determination in step SG2 is "NO", that is,
Even if the value of the register TR is larger than 6 and the track is a percussion instrument sound, the process proceeds to step SG4.

At step SG4, registers KC and VO
After outputting each data stored in each of LV (TR), KON and TR, that is, the key code, the currently set volume offset value, the key-on signal and the track number to the tone signal forming circuit 11, After the reproduction processing routine, the process returns to the interrupt processing routine of FIG. 6 and proceeds to step SD4.

Next, the counting process of the CPU 2 will be described with reference to the flowchart of FIG. When the processing of the CPU 2 proceeds to step SD6 of FIG. 6, the count processing routine shown in FIG. 10 is started. First, the CPU2
After proceeding to the processing of step SH1 and incrementing the value of the tempo clock register CLK by 1, step SH
Go to 2.

In step SH2, it is determined whether the value of the tempo clock register CLK is equal to one pattern time. If the result of this determination is "YES", then the operation proceeds to step SH3. In step SH3, the tempo clock register CLK is cleared to 0, and then the process proceeds to step SH4.

On the other hand, when the result of the determination in step SH2 is "NO", that is, the tempo clock register C
Even if the value of LK is not equal to one pattern time, the process proceeds to step SH4. In step SH4, it is determined whether the value of the tempo clock register CLK divided by 4 is 0. If the result of this determination is "NO", nothing is done and the process returns to the main routine through the interrupt processing routine of FIG.

On the other hand, when the result of the determination in step SH4 is "YES", that is, when the value of the tempo clock register CLK divided by 4 is 0,
Go to step SH5. In step SH5, it is determined whether the value of the count register CT is equal to the constant B _MAX . If the result of this determination is "NO", then do nothing,
After the interrupt processing routine of FIG. 6, the process returns to the main routine.

On the other hand, if the result of the determination in step SH5 is "YES", that is, if the value of the count register CT is equal to the constant B _MAX , the process proceeds to step SH6. In step SH6, the value of the count register CT is incremented by 1, and then the interrupt processing routine of FIG. The process of steps SH4 to SH6 described above is a process of counting the value of the count register CT for each beat.

Next, a second embodiment of the present invention will be described. In this embodiment, as shown in FIG.
When a key in the right range of the keyboard is pressed during the automatic accompaniment (FIG. 12 (a)) (FIG. 12 (b)), the automatic accompaniment is performed at a predetermined rate (for example, one level every 1/16 beat). Mute,
After a predetermined time (for example, 2 beats) has elapsed since the last key in the right key area was pressed, a predetermined rate (for example, 1/16)
The automatic accompaniment is restored at 1 level for each beat. As a result, even if the key-depressed state is detected after the automatic accompaniment is started, the musical sound does not change abruptly.

A second embodiment of the present invention will be described below with reference to the drawings. First, the configuration of the electronic musical instrument is similar to that of the first embodiment. Since the operation is almost the same as that of the first embodiment, only the mute processing routine of the CPU 2 which is the feature of this embodiment will be described. The processing of the CPU2 is step SE1 in FIG.
When the process goes to, the mute processing routine shown in FIG. 13 is started. The CPU 2 first proceeds to step SF101,
The value of the count register CT is the style number S shown in FIG.
It is determined whether or not the value is equal to or more than the value of the mute delay MTDD of the track number TR of the style table STLTBL of TLN. That is, it is determined whether or not the time to release the mute has been reached. If the result of this determination is "NO", then the operation proceeds to step SF102.

In step SF102, the style number S
Whether or not the mute level MTLD of the track number TR of the style table STLTBL of TLN is FF _H ,
That is, it is determined whether to completely mute or simply lower the level. If the result of this determination is "NO", the flow proceeds to step SF103. Step SF10
In 3, the value stored in the register VLM with the sign (-) is stored in the target register TGT, and then the process proceeds to step SF105.

On the other hand, when the result of the determination in step SF102 is "YES", that is, the style number STLN.
When the mute level MTLD of the track number TR of the style table STLTBL is FF _H , the process proceeds to step SF104. At step SF104, the value of the offset volume OVLD and the mute level MTLD of the track number TR of the style table STLTBL of the style number STLN are set in the target register TGT.
And the value of are stored, and then step SF105
Go to.

In step SF105, the register VOL
After decrementing 1 from the value of V (TR), the process proceeds to step SF106. In step SF106, it is determined whether the value of the register VOLV (TR) is smaller than the value stored in the target register TGT. If the result of this determination is "NO", nothing is done and the process returns to the reproduction processing routine of FIG. 7 and proceeds to step SE2.

On the other hand, when the result of the determination in step SF106 is "YES", that is, the register VOLV (T
If the value of R) is smaller than the value stored in the target register TGT, the process proceeds to step SF107. In step SF107, after the value stored in the target register TGT is stored in the register VOLV (TR), the process returns to the reproduction processing routine of FIG. 7 and proceeds to step SE2.

When the result of the determination in step SF101 is "YES", that is, the value of the count register CT is the style table STL with the style number STLN.
Mute delay MTDD of track number TR of TBL
If it is greater than or equal to the value of, the process proceeds to step SF108.
In step SF108, the value of the register VOLV (TR) is incremented by 1, and then the process proceeds to step SF109.

At step SF109, the register VOL
It is determined whether or not the value of V (TR) is greater than or equal to the value of the offset volume OVLD of the track number TR of the style table STLTBL of the style number STLN. If the result of this determination is "NO", nothing is done and the process returns to the reproduction processing routine of FIG. 7 and proceeds to step SE2. On the other hand, if the determination result in step SF109 is "YES", that is, if the value of the register VOLV (TR) is equal to or greater than the value of the offset volume OVLD of the track number TR of the style table STLTBL of the style number STLN, the step Proceed to SF110. In step SF110, the value of the offset volume OVLD of the track number TR of the style table STLTBL of the style number STLN is stored in the register VOLV (TR), and then the process returns to the reproduction processing routine of FIG. 7 and proceeds to step SE2.

In the embodiment described above, when a key in the right range of the keyboard is pressed during automatic accompaniment, the automatic accompaniment is muted immediately or at a predetermined rate, and the last key in the right range is Although an example is shown in which the automatic accompaniment is restored at a predetermined rate after a certain time has elapsed since the key was pressed, the automatic accompaniment is performed at the predetermined rate after the predetermined time has elapsed since the last key in the right keyboard range was released. May be restored. Further, in the above-described embodiment, the example in which the volume of the sound being sounded is not controlled is shown, but the volume of the sound being sounded may be controlled. Furthermore, in the above-mentioned embodiment,
Although the example in which the mute fade-in / fade-out is controlled at a constant rate is shown, the mute / mute recovery may be performed at a constant time.

[0054]

As described above, according to the present invention, after the automatic accompaniment starts, even if a key depression state is detected, the automatic accompaniment does not change rapidly but gradually changes.
It has the effect of becoming a natural flow. Therefore, it does not give an unnatural feeling to the performer and the audience.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an electronic musical instrument according to first and second embodiments of the present invention.

FIG. 2 is a diagram showing an example of a configuration of a table for each style stored in a working memory 5 of FIG.

FIG. 3 is a flowchart showing the processing of a main routine of the CPU 2 of the electronic musical instrument according to the first and second embodiments of the present invention.

FIG. 4 is a flowchart showing key event processing of the CPU 2 of the electronic musical instrument according to the first and second embodiments of the present invention.

FIG. 5 is a flowchart showing a switch event process of the CPU 2 of the electronic musical instrument according to the first and second embodiments of the present invention.

FIG. 6 is a flowchart showing an interrupt process of the CPU 2 of the electronic musical instrument according to the first and second embodiments of the invention.

FIG. 7 is a flowchart showing a reproduction process of the CPU 2 of the electronic musical instrument according to the first and second embodiments of the present invention.

FIG. 8 is a diagram showing an electronic musical instrument C according to the first embodiment of the present invention.
It is a flow chart showing mute processing of PU2.

FIG. 9 is a flowchart showing note data processing of the CPU 2 of the electronic musical instrument according to the first and second embodiments of the present invention.

FIG. 10 is a flowchart showing a counting process of the CPU 2 of the electronic musical instrument according to the first and second embodiments of the invention.

FIG. 11 is a diagram for explaining a method of muting automatic accompaniment according to the first embodiment of the present invention.

FIG. 12 is a diagram for explaining a method of muting automatic accompaniment according to the second embodiment of the present invention.

FIG. 13 is a flowchart showing a mute process of the CPU 2 of the electronic musical instrument according to the second embodiment of the invention.

[Explanation of symbols]

1 ... Microcomputer, 2 ... CPU, 3 ... Tempo clock generation circuit, 4 ... Program memory, 5 ...
… Working memory, 6 …… Accompaniment data memory, 7 ……
Keyboard, 7a ... left key range, 7b ... right key range, 8 ... key detection circuit, 9 ... operation panel, 9a ... master volume, 9b ... start switch, 9c ... stop switch, 9d ... Style switch, 10 ... switch operation detection circuit, 11 ... tone signal forming circuit, 12 ... amplifier, 13 ... speaker.

Claims (1)

[Claims] 1. An electronic musical instrument having a keyboard composed of a plurality of keys and having an automatic accompaniment function, wherein when any key of the keyboard is pressed by a performer during automatic accompaniment, the automatic An electronic musical instrument comprising: a control unit that immediately or gradually lowers the volume of the accompaniment and gradually restores the volume of the automatic accompaniment after a lapse of a predetermined time from the last key depression state of the keyboard.