JPH06161450A - Automatic accompaniment device - Google Patents

Abstract

PURPOSE:To provide the automatic accompaniment device which gives a drive feeling to an accompaniment. CONSTITUTION:When a chord is changed at a pause Bn among pauses Bn-1, Bn, and Bn+1 of beats, anticipation is turned on at timing Aon in the figure and then enabled thereafter, and timing of the chord change is precedent from the timing of the pause Bn to the timing Aon in the figure. At the next pause Bn of beats as original timing of the chord change, the anticipation is disabled and the normal mode is entered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic accompaniment apparatus for automatically generating an accompaniment sound according to stored data.

[0002]

2. Description of the Related Art As is well known, various automatic accompaniment devices that automatically generate an accompaniment sound have been developed. As this type of automatic accompaniment apparatus, there is known an automatic accompaniment apparatus that stores chord progressions and performs accompaniment based on the read chords.

[0003]

By the way, since the above-described conventional automatic accompaniment device simply performs the accompaniment in accordance with the sequentially read out chords, the accompaniment only follows the chord corresponding to each time point, and the accompaniment does not have a driving feeling. It was uninteresting.

The present invention has been made under such a background, and an object thereof is to provide an automatic accompaniment apparatus which can give a driving feeling to an accompaniment.

[0005]

In order to solve the above-mentioned problems, the present invention relates to an automatic accompaniment apparatus which stores chord progressions and performs automatic accompaniment based on sequentially stored chords. Detecting means for pre-reading the code and detecting the code change in advance, instruction means for instructing anticipation, and when anticipation is instructed by the instructing means, from the timing of the code change detected by the detecting means It is characterized by comprising a code changing means for changing the code at an early timing.

[0006]

According to the present invention, the detecting means pre-reads the stored code to detect a code change in advance, the instructing means instructs anticipation, and the code changing means causes the anticipation by the instructing means. Is instructed, the code is changed at a timing earlier than the timing of the code change detected by the detecting means. This allows
The timing of the code change is preceded by the anticipation instruction.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an automatic accompaniment apparatus according to an embodiment of the present invention. In this figure, 1 is a key depression detection circuit. This key press detection circuit 1
A key press operation on a keyboard (not shown) is detected, and a detection signal corresponding to this is output.

Reference numeral 2 denotes a CPU (central processing unit), which controls each unit of this device connected via a bus 11. Details of the operation of the CPU 2 will be described later. Reference numeral 3 denotes a timer, which supplies an interrupt signal to the CPU 2 each time a time corresponding to a length of 64 minutes (1/16 of the length of a quarter note) elapses. By the supply of the interrupt signal, the CPU 2 executes the timer interrupt process described later. 4 is a program memory composed of a ROM (read-only memory),
A control program executed by the CPU 3 is stored. A working memory 5 is composed of a RAM (readable / writable memory), and temporarily stores various calculation results and register values by the CPU 2.

Reference numeral 6 is a chord progression memory composed of a RAM. As shown in FIG. 2, this chord progression memory 6 stores tables CS _{0 to} CS ₅ representing six types of chord progressions, and each table CS _{0 to} CS ₅ has a root note R.
Chord data CD for each beat composed of T and chord type CT is sequentially described from the beginning.

Reference numeral 7 is an accompaniment pattern memory composed of a ROM. The accompaniment pattern memory 7 stores accompaniment pattern data for two measures for each accompaniment style (rock, disco, etc.) and for each accompaniment part (rhythm, chord 1, chord 2 and bass 4 parts).
Each accompaniment pattern data is, for example, as shown in FIG. 3, a key-on code KON representing a sounding instruction, a key code KC to be sounded, and a key-off code KO representing a mute instruction.
FF, a key code KC to be muted, a duration code DL indicating a time from a previous event to the next processing, a duration time DT (a time unit is 64 minutes long), and anticipation (described later) are enabled. It is made up of five types of data, an anticipation on code AON and an end code END indicating the end of accompaniment. However, the accompaniment pattern data of the rhythm part stores a percussion instrument code representing a percussion instrument sound instead of the above key code, and the anticipation on code AON is included only in the accompaniment pattern data of the rhythm part. And

Here, anticipation, which is also called a preceding sound or a pre-taken sound, is a method in which a succeeding chord precedes the preceding chord for a predetermined time (usually about half a beat) to give a tune a driving feeling. . In this example, for example,
The anticipation control as shown in FIG. 4 is performed. That is, in the figure, first, B _n-1 , B _n , B
_It is assumed that _{n + 1} indicates the timing of dividing one beat. If the anticipation is turned _{on at} the timing of A _{on in} the figure, the anticipation is enabled thereafter. This anticipation is disabled at each beat division. In this case, since the anticipation is disabled at the next beat division B _n , the anticipation is enabled in the section T. Becomes That is, if there is a note in this section T, the note is converted so as to be in harmony with the chord originally designated between the beat of B _{n and} the beat of B _{n + 1} . It should be noted that A _on is ahead of the center of the beat, in the case of triplets, there may be a note slightly ahead of the center, so that it is also covered.

In this embodiment, when the chord is changed at the next beat delimiter B _n after anticipation is turned on, the chord change timing precedes the timing A _{on in} the figure. Then, the anticipation is disabled at the beat delimiter B _n , which is the original chord change timing, and the normal mode is restored.
On the other hand, when the chord is not changed at the beat division B _n , as described above, only the anticipation is disabled at the beat division B _n . By doing this, a chord that normally changes only at the timing of a strong beat (1st beat, 2nd beat, 3rd beat, ...) Leads by about a half beat in the part where anticipation is turned on. It becomes possible to change the chord at the so-called back beat timing, giving a feeling of driving to the performance.

Now, returning to FIG. 1, the structure of this apparatus will be described. In the figure, 8 is a switch detection circuit. This switch detection circuit 8 is used for starting / accompaniment of automatic accompaniment.
ON / OFF of each switch for selecting a stop or accompaniment style is detected, and an operation signal corresponding to this is output.

Reference numeral 9 denotes a sound source, which generates a tone signal in accordance with a tone control signal supplied from the CPU 2 via the bus 11. Reference numeral 10 denotes a sound system, which performs a filtering process such as noise removal on the musical tone signal supplied from the sound source 9, and then amplifies the musical tone signal and outputs it as a musical tone from a speaker.

Next, the operation of the automatic accompaniment apparatus having the above structure will be described with reference to the flow charts shown in FIGS.

A: Overall operation First, when the automatic musical instrument is powered on, the CPU
2 loads the control program from the program memory 4. Then, the main routine shown in FIG. 5 is started, and the process proceeds to step Sa1 of this routine. Step S
At a1, initial settings such as resetting various register values are performed. Then, when the process proceeds to step Sa2, it is determined based on the operation signal supplied from the switch detection circuit 8 whether or not the start / stop switch for automatic accompaniment is newly operated.

If the start / stop switch is newly operated, the result of this determination is "Yes", and the routine proceeds to the next step Sa3. In step Sa3,
The value of the flag RUN representing whether or not automatic accompaniment is being executed is inverted. Then, when the process proceeds to step Sa4, the flag R
It is determined whether or not the value of UN is "1", that is, whether or not automatic accompaniment is being executed.

If the value of the flag RUN is "1", the result of this determination is "Yes", and the next step S
Proceed to a5. In step Sa5, the following various register values and flag values are initialized. Register CLK: 2 corresponding to accompaniment pattern data
This is a register for storing the count value when the length of the measure is counted in units of 64 minutes, and "0" is set here. Registers DL _{0 to} DL ₃ : Registers that store the remaining time when the duration time set for each of the four accompaniment parts is down-counted, and are all set to “0” here.

Registers PP _{0 to} PP ₃ : Registers for storing pointers at the time of reading the accompaniment pattern data from the accompaniment pattern memory 7, and are all set to “0” here. Flag ANT: A flag that stores the binary state of enable / disable of anticipation,
Here, "0" is set, and anticipation is disabled. Register NRT: A register for storing root note data when pre-reading a chord. Here, the root note data CS _CSN (0) at the head of the chord progression memory 6 is set.

Register NTP: a register for storing chord type data when chord prefetching is performed. Here, the chord type data C at the head of the chord progression memory 6 is stored.
S _CSN (1) is set. Register CSP: A register for storing a pointer for reading a chord (chord data) from the chord progression memory 6, and here the address "2" of the second chord data from the beginning is set. After performing this initialization, the process proceeds to step Sa7.

On the other hand, when the value of the flag RUN is "0" in the above step Sa4, the determination result of the step Sa4 is "No", and the process proceeds to step Sa6. In step Sa6, the CPU 2 outputs a mute instruction signal to the accompaniment channel of the sound source 9, and the automatic accompaniment is stopped. Then, the process proceeds to step Sa7.

If the start / stop switch is not newly operated in the above step Sa2, the result of the determination in step Sa2 is "No", and the processing in steps Sa3 to Sa6 is not performed and the process directly proceeds to step Sa7. move on.

Next, in step Sa7, each key of the keyboard is scanned to determine whether or not there is a key event. Here, if there is a key event, the determination result is “Yes”, and the process proceeds to the next step Sa8. In step Sa8, the detection signal output from the key depression detection circuit 1 is fetched, and a key-on or key-off signal, a key code signal, etc. corresponding thereto are supplied to the sound source 9. As a result, a musical tone is generated in accordance with a keyboard operation such as a melody performance in accordance with the automatic accompaniment. Then, the process proceeds to step Sa9. On the other hand, if there is no key event in step Sa7, the determination result here is “No”, and step S7
The key event process of a8 is not performed, and the step Sa9 is directly executed.
Proceed to.

Then, in step Sa9, it is determined whether or not the style selection switch is newly operated based on the operation signal supplied from the switch detection circuit 8.
Here, if the style selection switch is newly operated, the result of this determination is "Yes", and the next step S
Go to a10. In step Sa10, the style number corresponding to the accompaniment style selected by the operator is registered in the register S.
Set to TYL. Next, when proceeding to step Sa11, the register STYL is added to each channel for the accompaniment of the sound source 9.
Set the tone color corresponding to the style number set in. Then, the process proceeds to step Sa12. On the other hand, if the style selection switch is not operated in step Sa9, the determination result here is “No”, and the style selection process of steps Sa10 and Sa11 is not performed, and the process directly proceeds to step Sa12.

Next, in step Sa12, it is determined whether or not the chord progression selection switch has been newly operated based on the operation signal supplied from the switch detection circuit 8. Here, when the chord progression selection switch is newly operated, the determination result is "Yes", and the process proceeds to the next step Sa13. In step Sa13, the chord progression number corresponding to the chord progression selected by the operator (the numbers corresponding to the tables CS _{0 to} CS ₅ representing six types of chord progressions) is set in the register CSN. Then, the process proceeds to step Sa14. On the other hand, when the chord progression selection switch is not operated in step Sa12,
The result of the determination here is “No”, and step Sa13
Directly without performing the chord progression selection process of step Sa14
Proceed to.

In step Sa14, it is determined whether or not the chord progression input mode switch is in the on state, based on the operation signal supplied from the switch detection circuit 8. Here, when the chord progression input mode switch is in the ON state, the result of this determination is “Yes”,
It proceeds to the next Step Sa15. In step Sa15,
It is determined whether or not the value of the flag RUN is “0”, that is, whether or not automatic accompaniment is being executed.

If the automatic accompaniment is not being executed, the result of this judgment is "Yes", and the routine proceeds to step Sa16. In step Sa16, the chord progression data input by the operator is written in the chord progression memory 6.
However, the chord progression data input here is data in which the minimum unit is one beat unit or a unit of more than one beat. Then, the process proceeds to step Sa17.

On the other hand, if the automatic accompaniment is being executed in step Sa15, the determination result here is "No", and the chord progression input process of step Sa16 is not performed.
The process directly proceeds to step Sa17. In addition, the above step Sa
In 14, when the chord progression input mode switch is not in the on state, the determination result here is “No”, and the process of steps Sa15 and Sa16 is not performed, and the process directly proceeds to step Sa17.

After performing various processing other than the above in step Sa17, the processing of the CPU 2 returns to the above-mentioned step Sa2, and thereafter, while the timer 3 described later does not interrupt, the above-mentioned steps Sa2 to Sa17 are performed.
The operation of is repeatedly executed.

B: Timer interrupt processing When an interrupt signal is supplied from the timer 3 every 64 minutes, the CPU 2 starts the timer interrupt processing routine shown in FIG. 6 each time, and advances the processing to step Sb1.
At step Sa1, whether the remainder CLKmod16 when the value of the register CLK is divided by 16 is “0”,
That is, it is determined whether or not the current timing is the start timing of the beat.

Here, if it is the timing of the beginning of the beat,
The result of this determination is “Yes”, and the next step Sb2
Proceed to. In step Sb2, the value of the register NRT is set in the work register RT and the value of the register NTP is set in the work register TP in order to prefetch the code. As a result, the data corresponding to the current code is held in the work registers RT and TP. Next, when proceeding to step Sb3, the data CS _CSN (CS
It is determined whether or not P) is not an end code, that is, whether or not there is code data to be read from the code progress memory 6.

If the data CS _CSN (CSP) is not the end code, the result of this judgment is "Yes", and the routine proceeds to the next step Sb4. In step Sb4,
Of the chord data pointed by the pointer of the chord progression memory 6, the root note data CS _CSN (CSP) is registered in the register N.
The chord type data CS _CSN (CSP + 1) is set in the register NTP at RT. As a result, the preread code data is held in the registers NRT and NTP. Next, in step Sb5, the register CSP
Is incremented by "2" so that the pointer of the chord progression memory 6 points to the chord data corresponding to the next beat. Then, the process proceeds to step Sb6.

On the other hand, in step Sb3, the data CS _CSN (C
SP) is an end code and indicates the end of the data to be read, the determination result here is “No”,
Without performing the processing of steps Sb4 and Sb5
Go to a6. Next, when proceeding to step Sb6, the CPU 2
Starts a reproduction processing routine (see FIG. 7) and executes reproduction processing (described later).

When the reproduction process ends and the process returns to the timer interrupt process routine (see FIG. 6), step Sb
Proceed to 7. In step Sb7, the value of the register CLK is incremented by "1", and time counting is performed in units of 64 minutes. Then, proceeding to step Sb8, it is determined whether or not the value of the register CLK has reached the length of 2 bars, that is, whether the present timing is the end of 2 bars.

If the current timing is the end of two measures, the result of this judgment is "Yes", and the routine proceeds to the next step Sb9. In step Sb9, all the registers PP _{0 to} PP ₃ are cleared to “0” and the pointer of the accompaniment pattern memory 7 is returned to the head address. This allows
The accompaniment pattern data is read from the beginning again. Also, the register CLK is cleared to "0", and the clocking of the length of 2 bars is restarted. Then, the process proceeds to step Sb10. On the other hand, if it is not the end timing of two measures in step Sb8, the determination result of step Sb8 is “N
“O”, the process of step Sb9 is not performed, and the process directly proceeds to step Sa10.

Next, in step Sb10, step S
Similar to b1, it is determined whether or not the current timing is the start timing of the beat. Here, if it is the timing of the beginning of the beat,
The result of this determination is “Yes”, and the next step Sb1
Go to 1. In step Sb11, the flag ANT is inverted to "0" to disable the anticipation. That is, in this embodiment, anticipation is disabled at each beat division. Then, the processing of the CPU 2 returns to the main routine. On the other hand, in step Sb10, if it is not the timing of the beginning of the beat, the determination result here is "No".
Therefore, the process of step Sb11 is not performed, and the process directly returns to the main routine.

C: Reproduction Processing When the processing proceeds to step Sb6 (see FIG. 6) of the timer interrupt processing routine, the CPU 2 activates the reproduction processing routine shown in FIG. 7, and step Sc1 of this routine.
Proceed to. In step Sc1, of the part numbers corresponding to the rhythm, chord 1, chord 2 and bass parts, the part number “0” corresponding to the rhythm part is set in the register PN. As other part numbers, “1” corresponds to code 1, “2” corresponds to code 2, and “3” corresponds to base.

Next, in step Sc2, it is determined whether or not the value of the register DL _PN is "0", that is, whether or not the duration time set in the rhythm part in this case has elapsed.

If the duration time has not elapsed, the process proceeds to step Sc11. Step Sc1
In 1, decrement the value of the register DL _PN by "1",
Count down duration time. And
When the process proceeds to step Sc9, the value of the register PN is incremented by "1" and the target of the reproduction process is switched to the next part, code 1.

Next, when proceeding to step Sc10, the current part number set in the register PN is "4".
Or not, that is, whether or not the reproduction processing of all the accompaniment parts has been completed. In this case, since the accompaniment part is set to chord 1 in step Sc9, the determination result here is "No", and the above-mentioned step Sc2 is performed.
Return to. If the duration time has not elapsed for each part, the above steps Sc2 and Sc1 are performed.
The operations 1, Sc9 and Sc10 are repeated. Thus
When the value of the register PN reaches "4", step Sc1
The determination result of 0 is "Yes", and the process returns to the above-mentioned timer interrupt processing routine. Then, each time the timer interrupt processing routine is started, the above-mentioned step S
This reproduction processing routine is started at b6 (see FIG. 6),
The above operation is repeated.

Thus, for example, if the duration time of the rhythm part has elapsed, the above-mentioned step Sc
The determination result of 2 is "Yes", and the process proceeds to step Sc3. In step Sc3, the aforementioned step Sa1 is executed.
At 0, the accompaniment pattern data PTN _{STYL , PN} (PP _PN ) corresponding to the style number set in the register STYL and pointed by the pointer PP _PN corresponding to the part (in this case, the rhythm part) is set to the accompaniment pattern. It is read from the memory 7 and set in the register DATA.

Then, in step Sc4, it is determined whether or not the value of the register DATA is the end code, that is, whether or not the relevant part has reached the end of accompaniment.
Here, when the value of the register DATA is the end code, the process proceeds to step Sc9, and as described above, the part to be reproduced is switched, and if the duration time has not elapsed for other parts, the above is performed. The operations of steps Sc2, Sc11, Sc9, and Sc10 are repeated.

On the other hand, if the value of the register DATA is not the end code in step Sc4, the process proceeds to step Sc5. At step Sc5, register DATA
It is determined whether the value of is a key-on code. Here, when the value of the register DATA is the key-on code, the process proceeds to step Sc12. In step Sc12,
The CPU 2 activates a sound generation processing routine (see FIG. 8) and performs sound generation processing (described later).

When the tone generation processing ends and the processing returns to the reproduction processing routine (see FIG. 7), the process proceeds to step Sc16. In step Sc16, the value of the register PP _PN is incremented by "2", and then the process returns to step Sc3. Then, the next accompaniment pattern data is read out, and the determinations in and after step Sc4 are repeated.

On the other hand, if the value of the register DATA is not the key-on code in step Sc5, the process proceeds to step Sc6. In step Sc6, the register DAT
It is determined whether the value of A is a key-off code. Here, when the value of the register DATA is the key-off code, the process proceeds to step Sc13. In step Sc13,
From the accompaniment pattern memory 7, the key code stored at the next address (however, in this case, it becomes a percussion instrument code because it is a rhythm part) PTN _{STYL, PN} (PP _{P N} +
1) is read and this is set in the register KC.

Next, in step Sc14, the CPU
2 supplies the key-off signal and the key code (percussion instrument code) set in the register KC to the sound source 9. As a result, the generation of the tone signal by the sound source 9 is stopped and the sound is muted. Next, when the processing of the CPU 1 proceeds to step Sc16, the value of the register PP _PN is incremented by “2”,
The pointer of the accompaniment pattern memory 7 points to the next accompaniment pattern data. Then, the above-mentioned step Sc3
After returning to step 1 and reading the next accompaniment pattern data, the determinations in step Sc4 and subsequent steps are repeated.

On the other hand, if the value of the register DATA is not the key-off code in step Sc6, the process proceeds to step Sc7. In step Sc7, the register DAT
It is determined whether the value of A is an anticipation on code. If the value of the register DATA is the anticipation on code, step Sc15
Proceed to. In step Sc15, the value of the flag ANT is inverted to "1" to enable anticipation. Then, after incrementing the value of the register PP _PN by “2” in step Sc16, the process returns to step Sc3 described above and the above operation is repeated.

On the other hand, in step Sc7, when the value of the register DATA is not the anticipation on code (in this case, it means that the value of the register DATA is the duration code), the process proceeds to the next step Sc8. . In step Sc8, the duration time data PTN _{STYL, PN} (PP _PN +1) stored at the next address of the accompaniment pattern memory 7 is read and set in the register DL _PN . This allows
The duration time is reset. Then, in step Sc9, the accompaniment part is switched, and thereafter, the above-described reproduction operation is repeated for other parts.

D: Sound Generation Processing Step Sc12 (see FIG. 7) of the reproduction processing routine.
When the processing advances to step S2, the CPU 2 activates the sound generation processing routine shown in FIG. 8 and advances the processing to step Sd1. In step Sd1, it is determined whether or not the value of the register PN is “0”, that is, whether the part is a rhythm part or a part other than the rhythm part.

If the part is a rhythm part, the result of this judgment is "Yes", and step Sd
Proceed to 7. In step Sd7, the accompaniment pattern memory 7
From the percussion chord PT stored at the following address
N _{STYL, PN} (PP _PN +1) is read and set in the register RN. Next, when proceeding to step Sd8, C
The PU 2 supplies the key-on signal and the percussion chord set in the register RN to the tone generator 9. As a result, the sound source 9 supplies the rhythm sound of the percussion instrument to the sound system 10, and the sound is generated. Then, the processing of the CPU 2 ends this sound generation processing routine, and the reproduction processing routine (see FIG. 7).
Refer to). That is, in the rhythm part, sound generation processing is performed regardless of whether anticipation is on or off.

On the other hand, if the part is a part other than the rhythm part, the result of the determination in step Sd1 is "No", and the process proceeds to step Sd2. Step Sd
2, the accompaniment pattern memory 7 stores the key code PTN stored at the address next to the key-on code.
_{Read STYL, PN} (PP _PN +1) and register this
Set to C. Next, in step Sd3, it is determined whether the value of the flag ANT is "1", that is, whether anticipation is enabled.

If the anticipation is enabled, the process proceeds to the next step Sd4. In step Sd4, it is determined whether or not the value of the register NRT is equal to the value of the register RT, and the value of the register NTP is equal to the value of the register TP. That is, here
The pre-read code is used to determine whether there is a code change.

If there is a code change, the result of this judgment is "No", and the flow advances to step Sd5. In step Sd5, the pitch conversion of the key code set in the register KC is performed based on the value of the register NRT and the value of the register NTP, that is, the root note data and the chord type data corresponding to the pre-read chord. To do. Next, when proceeding to step Sd6, the CPU 2 supplies the key-on signal and the key code subjected to the pitch conversion at step Sd5 to the sound source 9. As a result, the sound source 9 supplies a tone signal based on the pre-changed and changed code to the sound system 10 for sound generation. Then, the processing of the CPU 2 ends this sound generation processing routine, and the reproduction processing routine (see FIG. 7).
Refer to).

On the other hand, if there is no code change in step Sd4, the process proceeds to step Sd9. In step Sd9, pitch conversion of the key code set in the register KC is performed based on the value of the register RT and the value of the register TP, that is, the root note data and the chord type data corresponding to the current chord. Next, proceeding to step Sd6, the CPU 2 supplies the key-on signal and the key code subjected to the pitch conversion in step Sd9 to the sound source 9, whereby normal sounding other than anticipation is performed. Then, the processing of the CPU 2 ends this sound generation processing routine and returns to the reproduction processing routine (see FIG. 7).

As described above, in this embodiment, the anticipation on code is included in the accompaniment pattern data corresponding to the rhythm part of the accompaniment pattern memory 7, and the anticipation is performed at the timing when this code is read. Is enabled (step Sc1
5). On the other hand, the chord data in the chord progression memory 6 is preread for one beat (step Sb4), and when a chord change is detected while the anticipation is enabled (step Sd5), the chord change is detected as the current chord change. The tone generation timing is preceded (step Sd6), and the parts other than the rhythm part are sounded based on the changed chord. Then, anticipation is disabled at the timing of the original chord change, that is, the timing of the next beat delimiter (step S).
b11). Such an operation is repeated every time the anticipation on code is read.

In this embodiment, the anticipation on code is included only in the accompaniment pattern data of the rhythm part, but the present invention is not limited to this. The anticipation control may be performed independently for each accompaniment part by including a partition on code. At this time, when anticipation is performed on the syncopated portion of each part, the syncopation is further emphasized. Further, the anticipation enable / disable control may be performed by providing a switch for anticipation control, for example, and operating the switch instead of the mode of this embodiment.

[0057]

As described above, according to the present invention, the timing of chord change is preceded by the instruction of anticipation, and the chord also changes at a timing other than the beat timing, so that a feeling of drive is given to the accompaniment. It is possible to achieve an expressive accompaniment sound.

[Brief description of drawings]

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

FIG. 2 is a diagram showing stored contents of a chord progression memory in the embodiment.

FIG. 3 is a diagram showing storage contents of an accompaniment pattern memory in the embodiment.

FIG. 4 is a diagram showing an outline of anticipation control according to the embodiment.

FIG. 5 is a flowchart showing a main routine of a control program executed by a CPU in the embodiment.

FIG. 6 is a flowchart showing a timer interrupt processing routine of a control program executed by a CPU in the embodiment.

FIG. 7 is a flowchart showing a reproduction processing routine of a control program executed by a CPU in the embodiment.

FIG. 8 is a flowchart showing a sound generation processing routine of a control program executed by a CPU in the embodiment.

[Explanation of symbols]

1 ... Key press detection circuit, 2 ... CPU, 3 ... timer, 4
...... Program memory, 5 ...... Working memory, 6 ...
… Chord progression memory, 7… Accompaniment pattern memory, 8…
… Switch detection circuit, 9 …… Sound source, 10 …… Sound system, 11 …… Bass

Claims (1)

[Claims] 1. An automatic accompaniment device for storing chord progressions and performing automatic accompaniment based on the sequentially stored chords, a detection means for pre-reading the stored chords, and detecting a chord change in advance. And a code changing means for changing the code at a timing earlier than the timing of the code change detected by the detecting means when the anticipation is instructed by the instructing means. And an automatic accompaniment device.