JPH10133661A - Automatic playing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change the pitch of a base to a pitch having no odd feel with a chord after change in changing the chord. SOLUTION: Chord route data CR written in a chord route register is read out (step 188) when there is a chord event (step 184). The key number data KN meeting the chord route CR is written as the key number data KN of the base into an assignment memory (step 194). As a result, the base tones are changed to the pitch meeting the chord route after the change or the pitch meeting the chord route in changing the chord and the base tones having no odd feel with the chord are produced. The sequence of base pattern data BP is reset and the base tones are produced from the key-on event of the ensuing base tones (steps 184, 190, 192).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic performance device that changes the pitch of a bass to a tone that does not cause uncomfortable feeling when a chord is changed.

[0002]

2. Description of the Related Art Conventional automatic performance devices include ROM, RA
The automatic performance information stored in a storage medium such as an M or CD (compact disk) is read out to automatically play a musical tone. Some conventional automatic performance devices have an automatic accompaniment function for automatically performing an accompaniment part composed of a chord sound and a bass sound.

In this automatic accompaniment function, the chord data and the base data stored in the storage medium are read out and the accompaniment part is automatically played. At this time, the pitch of the bass is changed according to the chord. For example, when the chord is "C major", the bass tone is any of the constituent sounds of the chord "do (C), mi (E), tho (G)", and when the chord is "F major" , The bass sound is one of the constituent sounds of the chord “Fa (F), La (A), Do (C)”. In the conventional automatic performance device, the range of the bass sound is limited to one octave.

[0004]

For example, in the above-mentioned conventional automatic performance apparatus, as shown in FIG. 16A, a measure having a base pattern corresponding to the chord "C major" and having a quarter time signature is shown in FIG. The pitches that make up the chords are 1
If the chord is changed to "F major" on the fourth beat when the beat pattern is developed in beats, the base pattern is shifted (transposed) as shown in FIG. 16B. Thus, the "do (C)" sound of the fourth beat of the "F major" base pattern "fa (F), do (C), la (A), do (C)" is produced.

[0005] However, although the pitch of the chord itself has risen from "C major" to "F major", the bass tone has dropped from "mi (E)" to "do (C)", giving a sense of incongruity. Occurs. Also, since the sound of "de (C)" is not "fa (F)" of the chord root of "F major" and the bass sound is limited to the pitch within one octave, the bass sound is After "mi (E)" pronounced on the third beat, it falls to "do (C)".

As described above, in the conventional automatic performance device, when the chord is changed, the pitches in the order determined by the base pattern are output, so that pitches other than the chord root are generated. In this case, a change in the pitch of the bass when the chord is changed may cause a sense of incongruity.

[0007]

In order to solve the above problems, the present invention provides a method of changing the pitch of a bass to the same pitch as the chord root of the changed chord or a pitch corresponding to the chord root when the chord is changed. It is intended to be changed. Thus, when the chord is changed, the bass tone is changed to a pitch that does not cause a sense of incompatibility with the changed chord.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

1. 1. Overall Circuit of First Embodiment FIG. 1 shows an overall circuit of an electronic musical instrument. Each key of the keyboard 1 is used to generate / mute a musical tone. The keys are scanned by a key scan circuit 2 to detect data indicating a key operation, that is, a key on / key off.
The data is written to the RAM 6 by the PU 5. Then, the data is compared with the data indicating the on / off state of each key stored in the RAM 6 until then, and the CPU 5 determines the on / off event of each key.

Thus, the position of the key related to the on / off operation is detected. Further, since the scanning is performed periodically, the timing of turning on / off the key is also detected. The keyboard (electronic keyboard instrument) 1 may be replaced by an electronic stringed instrument, an electronic tube (lead) instrument, an electronic percussion (pad) instrument, a computer keyboard, or the like.

The panel switch group 3 is provided with various operation switches related to performance. These operation switches include an auto play key for specifying an automatic performance mode, a mode key for switching the type of automatic performance mode, a base pattern selection key for selecting a base pattern, and a code for specifying a code. There are a designation switch, a rhythm selection key for selecting a rhythm, etc. (neither is shown).

Each switch of the panel switch group 3 is scanned by a panel scan circuit 4. By this scanning, data indicating ON / OFF of each switch is detected and written into the RAM 6 by the CPU 5. Then, the data is compared with the data indicating the on / off state of each switch, which has been stored in the RAM 6, and the CPU 5 determines whether the switch is on or off.

A code designation area (not shown) is provided in a part of the keyboard 1. This chord designation area is set, for example, to a lower key within a range of 1 to 2 octaves from the lowest note key. In a semi-automatic chord playing mode described later, when a key in the chord designation area is depressed according to a predetermined promise, a chord (chord event) is input in response to the key-on. The input of this code can also be made by the above-mentioned code designation operation switch.

Also, one of the keys on the low tone side of the keyboard 1
A chord playing area (not shown) is provided in the range of the section or all keys. The chord playing area is set in a range where a chord is often played. In a manual chord playing mode, which will be described later, when a plurality of keys are pressed in the chord playing area, a chord input by the key pressing is detected.

The RAM 6 stores, in addition to the various data described above, various data processed by the CPU 5 and data necessary for the processing. The RAM 6 is provided with a working memory 32 described later.

The ROM 7 (internal storage medium / means) stores computer programs corresponding to respective flowcharts described later, such as system programs, job programs, various fixed data, etc., corresponding to various processes executed by the CPU 5. . This computer program is CD-
Stored in a ROM (external storage medium / means) or the like;
M6 (internal storage medium / means) may be written and stored (installed / transferred / copied).

This ROM 7 has a base pattern memory 3
3 are provided. From this base pattern memory 33, key number data corresponding to the musical tone of the bass part is read out, corrected and changed in accordance with the chord route of the chord tone emitted together with the bass tone, and outputted.

The ROM 7 is provided with a code pattern memory 34 in which code data CP for various codes is stored. The chord data CP is composed of key number data KN of a sound constituting the chord. The key number data KN is based on a predetermined code route, and if the input code route changes, the key number data KN is shifted accordingly.

From the code pattern memory 34, key number data KN corresponding to the code specified by manual input or the code of the automatic performance is output, sent to the tone generator 10, and transmitted from the sound system 11 to the chord performance. Is pronounced.

Further, a rhythm pattern memory 35 is provided in the ROM 7. This rhythm pattern memory 3
5 stores a rhythm pattern (percussion instrument sound) for each rhythm such as disco, waltz, and march. Then, the rhythm pattern data corresponding to the rhythm selected by the rhythm selection key is read out from the rhythm pattern memory 35 and is sounded by the tone generator 10 to perform an automatic rhythm performance.

The programs and data stored in the ROM 7 include a RAM 6, a RAM / ROM card,
The program and data may be stored in a floppy disk, a CD-RAM / ROM, or the like, and programs and data are loaded from these storage media into the RAM 6 to execute each process.

The automatic performance memory 8 stores automatic performance information MP of a plurality of music pieces. The automatic performance memory 8 is composed of a RAM or a ROM, but may be integrated with the RAM 6 or the ROM 7 or may be a RAM / ROM card, a floppy disk, a CD-RAM / ROM, or the like.

The MIDI circuit 9 is an interface for transmitting and receiving musical sound information to and from an externally connected electronic musical instrument. The musical tone information conforms to the MIDI (Musical Instrument Digital Interface) standard, and a tone or automatic performance is performed based on the musical tone information. The automatic performance information MP is also sent from another electronic musical instrument via the MIDI circuit 9.

The tone data corresponding to the automatic performance information MP and the tone data corresponding to ON / OFF of each key of the keyboard 1 are sent to a tone generator 10 and a tone corresponding to the tone data is generated from a sound system 11. You. In the tone generator 10, a tone generation system for a plurality of channels, for example, 16 channels is formed by time-division processing, whereby a tone is generated polyphonically. This tone generator 10
Is provided with an assignment memory 31 described later. Various data stored in the RAM 6 are sent to and displayed on an LCD (liquid crystal display) 12 via an LCD driver 13.

The timer circuit 14 generates a clock signal φ having a constant cycle by performing time counting. This clock signal φ is C as an interrupt signal INT.
Input to PU5.

2. FIG. 2 shows the code pattern memory 34 described above. The chord pattern memory 34 stores constituent sounds for each chord type such as major, minor, and seventh. The constituent sound of each chord is the key number KN of each chord when the chord root is “C”.

All the constituent sounds of each chord are read out according to the generated chord type data CT, shifted according to the generated chord root data CR, and sent to the assignment memory 31 of the tone generator 10. Is pronounced. The pitches of the constituent sounds shifted by the shift corresponding to the chord route data CR are "C" to "C".
Beyond the range of one octave of "B", the pitch is corrected to one octave lower or higher.

3. Base Pattern Memory 33 (First Embodiment) FIG. 3 shows the base pattern memory 33 described above. The base pattern memory 33 stores key number data KN of a bass sound for each chord type such as major, minor, and seventh. The base sound of one code is composed of four sounds, and these four sounds are read out according to the values of two specific bits of the time count data TM of the time counter 47. These two specific bits correspond to the beat (beat) of one measure, and the first beat (00) and the second beat (0)
1) The third beat (10) and the fourth beat (11) are shown.

The read bass sound is shifted in accordance with the generated chord route data CR and sent to the assignment memory 31 of the tone generator 10 to be sounded. If the pitch of the shifted bass sound exceeds the range of one octave from "C" to "B" by the shift according to the chord route data CR, the tone is corrected to a musical tone one octave lower or higher.

The set beat, that is, the beat of the selected automatic rhythm performance is other than 4/4 beat, for example, 3 beats.
/ 4 time, 2/4 time, 1/2 time, 8/8 time, 6 /
In the case of 8 beats and 4/8 beats, the reading method of the base pattern memory 33 is changed.

For example, the fourth beat in FIG. 3 is not read out, or the third and fourth beats are read out simultaneously after the first and second beats are read out simultaneously. For example, two beats of bass sound are read during one beat. In 8/8 time, 6/8 time, 4/8 time, etc., the time count data TM
The bit indicating the beat includes the next lower bit.

4. Assignment Memory 31 (First Embodiment) As shown in FIG.
A memory area for six channels is formed, and tone data assigned to the sixteen time-division tone generation channels formed in the tone generator 10 is written. Note that the assignment memory 31 may be provided in the RAM 6.

The tone data written into each channel memory area includes ON / OFF data ON / OFF, key number data KN, tone number data TN, touch data TC, gate time data GT, and the like. The ON / OFF data ON / OFF includes ON ("1"), OFF ("0"), or sound ("1") of each key of the keyboard 1.
This is data indicating mute ("0").

5. Working Memory 32 (First Embodiment) As shown in FIG. 5, the working memory 32 is provided with various registers, various buffers, various counters, and various memories. The mode flag register 41 stores mode flag data MF indicating the operation mode of the electronic musical instrument. The mode flag data MF includes a plurality of start / stops of an automatic performance mode according to the operation of an auto play key (not shown) provided in the panel switch group 3, and bar mark data BM of the automatic performance information MP. Indicates the start / stop of the bar standby mode when read.

The input buffer register 42 stores tone data (ON / OFF) corresponding to the performance information input by the user.
Off data ON / OFF, key number data KN, tone number data TN, touch data TC, gate time data GT, etc.) are stored. The performance information in this case is
It is inputted by operating the keyboard 1 or inputted from outside through the MIDI circuit 9. A plurality of tone data can be set in the input buffer register 42.

The reproduction buffer register 43 stores tone data (on / off data O) corresponding to the automatic performance information MP.
N / OFF, key number data KN, tone number data TN, touch data TC, gate time data GT,
Step time data ST, etc.) are stored. A plurality of tone data can be set in the reproduction buffer register 43 as well. If the automatic performance information MP is information of a chord part, the chord data CP is stored instead of the key number data KN.

In the input tone number register 44, tone number data TN input by a tone number key (not shown) provided in the panel switch group 3 is set. In the reproduction tone number register 45, tone number data TN in the automatic performance information MP is set. The reproduction tone number register 45 includes:
When the timbre is changed, the tone number data TN corresponding to the changed timbre is set.

The input tone number register 44
The touch data TC and the like may be added to the tone number data TN set in the reproduction tone number register 45, and a plurality of tone number data TN may be set. Further, the tone number data TN input by the tone number key of the panel switch group 3 may be set in the reproduction tone number register 45 by mode switching.

In the tempo beat register 46, tempo beat data TB corresponding to the tempo data TP and the beat data BE in the automatic performance information MP are set.
This tempo beat data TB represents the time for one bar.
The time counter 47 is incremented by 1 every time the clock signal φ becomes high level, and the time count data TM is counted.

When the time count data TM matches the tempo beat data TB, the time count data TM is cleared. The frequency of the clock signal φ may be the same as or different from the frequency of the clock signal φ in the timer circuit 14. The frequency of clock signal φ changes according to the set tempo. The specific bit of the time counter 47 indicates the number of beats in one bar. Automatic rhythm performance, chord performance, and bass performance are executed according to the beat bit.

The assignment address counter 48 counts assignment address data AA specifying each channel memory area of the assignment memory 31. In the reproduction address counter 49, the read address data RA of the automatic performance memory 8 or the base pattern memory 33 is counted.

The chord type register 50 stores chord type data CT of a detected chord or a chord to be automatically played. The chord route register 51 stores chord route data CR of the detected chord or the chord to be automatically played. The detected code is stored in a step 104 in a main routine to be described later,
These codes are input from the keyboard 1 or the panel switch group 3 at 106, 112, 114, and the like.

The base data register 52 stores the base data BA included in the automatic performance information MP when the musical sound to be automatically performed is a base sound. The code event flag CF is stored in the code event flag register 53. The code event flag CF is set to "1" when a code event occurs, and reset to "0" when the code event ends.

A chord event is the start of the sound of a chord sound that is first sounded at or after the start of automatic performance, or the start of sound of a changed chord sound in the case of a retrigger whose chord is specified or changed during automatic performance. It is.
Further, the case where a chord is designated or changed during the automatic performance is when the chord data CP in the automatic performance information MP is sequentially read out, or a key or a chord designation switch in the chord designation area is operated. hand,
This is when the chord is specified or changed by the player.

7. Main Routine (First Embodiment) FIG. 6 shows a flowchart of a main routine executed by the CPU 5. This process starts when the power is turned on.
At the start, the RAM 6 and the working memory 3
2. The timer circuit 14, the automatic performance memory 8, etc. are cleared, and various initialization processes are performed (step 10).
2).

Next, when a key-on event of the keyboard 1 is detected (step 104), key-on processing based on this on-key is performed (step 106).
When a key-off event is detected (step 10
8) A key-off process based on the off-key is performed (step 110).

In the key-on process (step 106), the key number data KN of the ON key, the touch data TC,
ON / OFF data ON / OFF of "1" is set in the input buffer register 42, and this musical tone data is written together with the tone number data TN of the input tone number register 44 into a memory area of the assignment memory 31 corresponding to an empty channel. It is. As a result, a musical tone corresponding to the ON key is generated at a timing corresponding to the ON key. In the automatic performance mode, a semi-automatic chord playing operation and a manual chord playing operation, which will be described later, are performed.

In the key-off process (step 110), among the key number data KN in the assignment memory 31, the same tone data as the key number data KN of the off key is searched, and the ON / OFF data O of this tone data is searched.
N / OFF is set to "0". Thus, the tone corresponding to the off key is muted.

Next, the on / off state of each key of the panel switch group 3 is determined (step 112). If it is determined that an on / off event has occurred, a process corresponding to the key having the on / off event is performed. (Step 114).
In the panel switch processing (step 114), when the tone number key of the panel switch group 3 is operated, the tone number data TN input by the tone number key is stored in the input tone number register 44 or the reproduction tone number register 45. It is memorized.

Input of the above code (code event)
Is detected by the key-on process in steps 104 and 106 and the panel switch process in steps 112 and 114, and the output of a musical tone (chord sound) corresponding to the input code (chord event) is executed in steps 116 and 118. Is done.

Further, when the automatic performance mode is selected (step 116), an automatic performance process (step 118) is performed, and when there is input / output information by the MIDI circuit 19 (step 120). , MIDI input / output processing (step 122) is performed. And
After the other processing (step 124) is performed, the routine returns to step 104. Thereafter, the above processing is repeatedly executed until the power is turned off.

8. Types of Automatic Performance Mode (First Embodiment) The types of automatic performance modes in this embodiment include a full automatic performance mode, an automatic melody performance mode, an automatic accompaniment mode, and the like. ,
There are a semi-automatic chord playing mode and a manual chord playing mode.

In the fully automatic performance mode, the melody part,
Automatic performance information MP for all musical tone (performance) parts such as a chord part and a bass part is read out, and all musical tone (performance) parts are automatically played. In the automatic melody playing mode, one or more melody parts are automatically played.

In the automatic chord playing mode, the automatic playing information MP for the chord part and the base part is read out, and the chords are switched in the order determined by the automatic playing information MP. Further, the chord sound is determined based on the chord data CP in the automatic performance information MP, and the base sound is determined based on the base data BA in the automatic performance information MP.

In the semi-automatic chord playing mode, when a key is turned on in accordance with a predetermined rule in the chord designation area, the chord sound is switched according to the chord designated by the key-on. Further, the chord specified by the player is converted into key number data KN of constituent sounds of the chord by the chord data CP stored in the chord pattern memory 34. In this case, each key number data KN of the code is shifted according to the code route.

The key number data KN is stored in the working memory 32, and further stored in the tone generator 10.
The chord sound is automatically played from the sound system 11 by being sent to the.

The base pattern of the bass sound is selected by operating the base pattern selection key, or selected according to the type of the selected automatic rhythm performance. The selected base pattern is read from the base pattern memory 33 and written to the reproduction buffer register 43. Also, the key number data KN (pitch) of the base pattern data BP is shifted according to the chord route.

As a result, the chord sound and the bass sound of the chord selected by the player are automatically played. As described above, in the semi-automatic chord playing mode, the player does not need to press the keys of all the note names constituting the chord, but only has to press the keys according to a predetermined promise. For example,
The chord root and chord type can be specified at the same time simply by pressing a part (one or two notes) of the chord names constituting the chord.

In the manual chord playing mode, the player performs a normal chord playing in the chord playing area of the keyboard 1. In other words, the performer manually performs a chord performance by depressing all the keys of the note names constituting the chord in the chord performance area of the keyboard 1. In this case, the bass performance is automatically performed according to the base pattern selected by the base pattern selection key or the base pattern selected according to the type of the selected automatic rhythm performance, and according to the chord root of the pressed key. The bass sound is shifted.

9. Key-On Process (First Embodiment) FIG. 7 is a flowchart of the key-on process (step 106). As described in the main routine, when a key-on event of the keyboard 1 is detected (FIG. 6, step 104), a key-on process based on the on-key is performed (step 106). Therefore, if the player presses a chord sound, the key-on process (step 106) of FIG. 7 is performed.

First, the mode flag MF of the mode flag register 41 is read, and it is determined whether or not the automatic play mode is selected by operating the auto play key (step 130). If not in auto play mode,
Since it is a normal manual performance, on-key sound generation processing (step 146) is performed.

In the on-key tone generation process (step 146), the on-key key number data KN and the touch data T
C, ON / OFF data ON / OFF of "1" is set in the input buffer register 42, and this musical tone data is stored in the memory area corresponding to the empty channel of the assignment memory 31 together with the tone number data TN of the input tone number register 44. Is written to. As a result, a musical tone corresponding to the ON key is generated at a timing corresponding to the ON key.

On the other hand, in the automatic performance mode,
It is determined whether or not the mode is the manual chord playing mode (step 132). If the mode is the manual chord playing mode, it is determined whether or not the ON key is a key in the chord playing area (step 134). If the on-key is not in the chord playing area, the melody part is being played, so the on-key sounding process (step 146)
Is performed.

Since the chord is composed of a plurality of different note names, it is determined in this step 134 whether or not there are a plurality of ON keys. If there is only one key, the chord is not played, and the sound of the key having the key-on event is generated in step 146.

On the other hand, if the key is turned on with a key in the chord playing area, the chord is detected (step 13).
6) The code event flag CF is set to "1" (step 138). This code detection processing (step 13
No. 6) is disclosed, for example, in Japanese Patent Application No. 2-136647. First, all pitch name data corresponding to the pitch at which the key-on event occurred is synthesized, and the synthesized data is stored in the reproduction buffer register 43. This synthetic data is 1
Bit data is arranged in the order of octave note names.

That is, "B, A #,
A, G #, G, F #, F, E, D #, D, C #, C "are arranged in the order of"", the bit of the note having a key-on is" 1 ", and the note having no key-on. The name bit is set to “0”. For example, in the case of "C major", "C, E, G"
Are keyed on, the synthesized data is "0000"
10010001 ".

On the other hand, the ROM 7 stores, for each code, sample data of the composite data as a data table (not shown). Further, in this data table, code root data CR and code type data CT corresponding to the code are stored. Alternatively, the lowest pitch of the pitches constituting the chord may be determined, and this pitch may be used as a chord root.

Then, when there is a key-on event, sample data that matches the composite data is searched for. If there is sample data that matches the synthesized data, the code indicated by the sample data is a key-on code.
The detected code data CP is stored in the reproduction buffer register 43, the code type data CT is stored in the code type register 50, and the code route data CR is stored.
Are stored in the code route register 51.

In the case of the semi-automatic chord playing mode (step 140), it is determined whether or not the key-on is within the chord designation area (step 142). When a key other than the chord designation area is depressed, a key sound having a key-on event is generated in an on-key generation process (step 146).

On the other hand, if there is a key-on in the code designation area, the key number data KN of the depressed key
Is detected on the basis of (step 144). For example, the ROM 7 stores code type data CT and code route data CR corresponding to the key number of the key in the code designation area.

Then, the code type data CT and the code route data CR corresponding to the key number of the key having the key-on event are read out and stored in the code type register 50 and the code route register 51. Further, a rhythm code base process described later (step 1)
In 56), the key number data KN corresponding to the code type data CT is read from the code pattern memory 34, and the read key number data KN is shifted according to the code route data CR.

The designation of a chord in the semi-automatic chord playing mode may be performed by pressing one of the keys in the chord designation area in accordance with a predetermined agreement, or may be performed in the chord designation area. May be performed by depressing a plurality of keys according to a predetermined combination.

10. FIG. 8 shows a flowchart of the cycle interrupt process. This process is executed by the CPU 5 each time the clock signal φ goes high. First, if it is determined that the automatic performance mode is set based on the contents of the mode flag register 41 (step 15).
0), the time count data TM of the time counter 47
Is incremented by 1 (step 152).

Then, the bit data corresponding to the beat is +
It is determined whether or not 1 has been set (step 154). As described above, the two specific bits of the time count data TM of the time counter 47 indicate one measure of beat. Therefore, when the specific bit is incremented, a rhythm sound, a chord sound, and a bass sound of the next beat are generated (step 156).

Next, if the value of the time count data TM incremented in step 152 matches the tempo beat data TB of the tempo beat register 46 (step 158), the time count data TM is cleared (step 160). Further, the bar standby mode flag of the mode flag register 41 is cleared (step 162). Thereby, the waiting for one measure is completed.

11. FIG. 9 shows the rhythm chord base processing (step 15).
The flowchart of 6) is shown. In the following description, for example, in the automatic accompaniment of a tune of four-quarter time, as shown in FIG. 10A, the base pattern is changed to "do (C), tho (G), mi (E ), G (G) ", and a case where the chord is changed to F major at the fourth beat during automatic performance in C major will be described as an example. Similar processing is performed when other code changes are made.

This code base processing (step 15
In 6), first, rhythm pattern data corresponding to the rhythm selected by the rhythm selection key is read from the rhythm pattern memory 35 (step 170). This rhythm pattern data is percussion instrument data corresponding to a rhythm such as a disco, waltz, or march. Then, the read rhythm pattern data is sent to the tone generator 10 (step 172), and a rhythm sound is generated from the sound system 11.

Next, it is determined whether or not the mode is the manual chord playing mode (step 174). In the manual chord playing mode, the key number data KN of the key having a key-on event due to the manual playing is
ON / OFF data ON / OFF, tone number data T
N, the touch data TC, the gate time data GT, and the like are sent to the tone generator 10, and the chord sound depressed by the player is emitted (step 182).

On the other hand, if the mode is not the manual chord playing mode, the mode is the semi-automatic chord playing mode, so that the code type data CT for the code detected in step 136 of the key-on process (step 106) is read from the code type register 50. Be sent out. Then, the key number data KN of the constituent sound corresponding to the chord type is read from the chord pattern memory 34 (step 17).
6), stored in the reproduction buffer register 43;

Then, the key number data KN of the constituent sound of the chord stored in the reproduction buffer register 43 is shifted by the pitch difference between the chord root of the chord specified by the player and the chord root of the reference chord (step). 178).

As described above, if the chord specified by the player is "F major", the chord root is "F"
And the chord type is "major". Therefore,
In step 176, the constituent sounds “C, E, G” corresponding to the chord type “major” are read from the chord pattern memory 34.

Then, the designated code "F major"
Since the pitch difference between the chord root “F” and the reference chord root “C” is two and a half, the constituent sounds “C, E, G” of “major” read from the chord pattern memory 34
Are shifted by two and a half tones, respectively, to become constituent sounds "F, A, C" of "F major".

The key number data KN shifted in accordance with the code route as described above includes ON / OFF data ON / OFF.
OFF, tone number data TN, touch data TC,
Tone generator 1 with gate time data GT etc.
Sent to 0. Thereby, the chord sound specified by the player is emitted (step 180). At this time,
The gate time GT is one beat (a quarter note).

The sound generation process of the chord sound (steps 180, 1
After 82), it is determined whether or not the event is a code event (step 184). If it is a code event, the code event flag CF is cleared (step 18).
6) The code route data CR is read from the code route register 51 (step 188).

The key number data KN corresponding to the code route data CR is the ON / OFF data ON / OFF data.
OFF, tone number data TN, touch data TC,
The data is sent to the tone generator 30 as base key number data KN together with the gate time data GT and the like, and written to the assignment memory 31 (step 19).
4). Thus, when there is a code event,
A bass tone corresponding to the performance or the chord root of the specified chord is generated. At this time, the gate time GT is
In the same manner as in step 180 described above, one beat (a quarter note) is set.

The key number data corresponding to the chord root CR is the key number data of the same pitch as the chord root CR or the key number data of a sound shifted by a predetermined pitch.
For example, when the range of the chord sound is higher than the range of the bass sound, the pitch of the bass is set to the same pitch as the chord root CR and lower by one or two or more octaves.

As described above, when the chord is changed to F major on the fourth beat of the accompaniment of C major, FIG.
As shown in (B), the bass sound of the fourth beat “S (G)” is changed to the pitch of the F major chord root “F (F)”. This prevents a sound other than the chord root from being emitted as the bass sound when the chord is changed, and prevents the bass sound from causing a sense of incongruity with the chord sound.

On the other hand, if it is not a code event,
A performance or a bass tone having a pitch corresponding to the designated chord is generated (steps 190 and 192). Step 19
0, the base pattern data BP corresponding to the code type stored in the code type register 50
The key number data KN corresponding to the beat is read from the base pattern memory 33.

In step 192, the read key number data KN of the bass sound is shifted according to the performance or the chord route of the designated chord. As described above, if the played or specified chord is “F major”, the chord root is “F” and the pitch difference with respect to the reference chord root “C” is two and a half. Therefore, the read key number data KN of the bass sound is shifted by two and a half sounds.

The above processing is performed every beat or every half beat (every predetermined musical time) in step 154 of the cycle interrupt processing (FIG. 8). If there is a chord event, the performance or the designated chord sound is performed. Is pronounced, and the bass tone is changed to a pitch corresponding to the chord root or the chord root and is emitted (steps 188, 1
94). At times other than the chord event, the key number data KN of the bass sound is shifted according to the pitch difference between the chord root of the played or specified chord and the reference chord root (step 192).

When there is a code event,
Regardless of the bass pattern, the bass tone is changed to a chord root or a pitch corresponding to the chord root (step 18).
4-184, 194). For example, in the automatic accompaniment of a tune of a quarter time signature, as shown in FIG. 11A, the base pattern data BP of “C major” stored in the base pattern memory 33 is a quarter note at the first beat. "Do (C)",
The second beat is “S” (G), which is an eighth rest and eighth note.
It is assumed that the beat is a half note “G”.

If the chord is changed to the F major at the fourth beat during the automatic performance in the C major, the conventional automatic performance apparatus uses the 4th beat as shown in FIG. At the beat, the bass sound is retriggered, and the pitches of the third and fourth beats of "F major", "do (C)", are generated. For this reason, although the pitch of the chord itself has risen from “C major” to “F major”, the bass tone has dropped from “G” to “C”, and this “ Since the sound of “C” is not “F” of the chord root of “F major”, a sense of incongruity occurs.

On the other hand, according to the present embodiment, when the chord is changed to "F major", the bass sound becomes "F major".
Since the chord root of the "major" is changed to "fa (F)", a bass tone that is not uncomfortable with the chord tone is generated.

12. Second Embodiment In the first embodiment, the semi-automatic chord playing mode and the manual chord playing mode are processed in the cycle interrupt processing shown in FIG. 8, whereas in the second embodiment, the main routine shown in FIG. In the middle automatic performance process (step 118), the semi-automatic chord performance mode and the manual chord performance mode are processed.

That is, in the second embodiment, the rhythm code base processing (step 156) shown in FIG. 9 is not performed, and the code base processing (FIG. 9) described later in the automatic performance processing (step 118) in FIG. 15) is performed.
In the automatic performance processing (step 118), various automatic performance modes such as an automatic chord performance mode, a full automatic performance mode, and an automatic melody performance mode are also processed.

Accordingly, in the cycle interrupt processing executed in the second embodiment, the beat bit increment processing (step 154) and the rhythm code base processing (step 156) in the processing shown in FIG. 8 are performed. Absent. The main routine executed in the second embodiment is the same as the main routine shown in FIG.

In the key-on process (step 106) shown in FIG. 7, steps 176 and 178 in FIG. 9 are inserted after the chord detection process (step 144) in the semi-automatic chord playing mode. That is, the constituent sounds of the reference chord corresponding to the chord type CT of the chord detected in the chord detection processing (step 144) are read from the chord pattern memory 34 and shifted according to the chord root.

Further, the whole circuit in the automatic performance apparatus of the second embodiment is almost the same as that of FIG. However, the base pattern data BP stored in the base pattern memory 33 is changed to the contents described later (FIG. 13).

13. FIG. 12 shows the automatic performance information MP stored in the automatic performance memory 8. The automatic performance memory 8 stores directory data DR and reproduction condition data RC. After the data DR and RC, automatic performance information MP of a plurality of music pieces is stored.

FIG. 12 exemplifies the data of the bass part in the automatic performance information MP. The automatic performance memory 8 also stores a melody part, a chord part, a backing part, an arpeggio, a rhythm, etc. The data of the other parts are stored in the same format. The automatic performance information MP in the full automatic performance mode is a mixture of melody part data, chord part data, base part data, rhythm part data, and the like, and is arranged in the order of pronunciation.

The automatic performance information MP of the bass part is
It consists of a note data group, bar mark data BM and return mark data RT inserted between the note data groups. The note data includes base data BA, gate time data GT, touch data TC, step time data ST, and the like. Note that the gate time data GT, the touch data TC, and the step time data ST
May not be included.

The base data BA is key number data of the pitch of the bass sound. The base data BA is key number data of any of the constituent sounds of the chord sound played simultaneously. For example, if the chord to be ensemble is “C major”, the base data BA is the key number data of one of the constituent sounds “do (C), mi (E), tho (G)” of the “C major” And the chord to be played is "F
In the case of "major", the base data BA is any key number data of the constituent sounds "fa (F), la (A), do (C)" of "F major".

Gate time data GT is data indicating the time from key-on to key-off. The step time data ST is data indicating the time from the beginning of a song or the beginning of a bar, that is, from the bar mark data BM to the start of sounding of the base data BA or the execution of a command.

The touch data TC is data indicating the speed or strength of key-on / off. This touch data T
C is provided for each key of the keyboard 1 and is data corresponding to a time difference between on / off of a plurality of key switches that are turned on / off with a time shift at the time of key operation. In accordance with the touch data TC, control of the volume of sound, frequency components, and the like is performed. The bar mark data BM is data indicating a break of each bar. The return mark data RT is data indicating that the music piece returns to the beginning.

At the head of the automatic performance information MP, performance condition data PC is stored. The performance condition data PC includes song name data SN, tempo data TP,
It is composed of beat data BE, tone number data TN, and the like. The song name data SN is data indicating an identification name such as a song name of the automatic performance information MP. Tempo data T
P and beat data BE are data indicating the tempo and time signature of the automatic performance based on the automatic performance information MP.

The tone number data TN includes a piano,
This is data set for each tone color or artificially created tone color according to the type of musical instrument such as a violin, flute, drum, cymbal, and the like. Note that this tone number data TN
May be stored in the middle of the automatic performance information MP of one song, in which case the timbre changes in the middle of the song. In addition, the automatic performance information MP of one music piece may be stored separately for a plurality of tracks, and tone number data TN may be stored at the head of the automatic performance information MP for each track. Each track has a different tone.

The tone number data TN includes data (for example, a sine wave, a triangular wave, a rectangular wave, an organ envelope, a parkus envelope, etc.) corresponding to the shape of the waveform.
Data corresponding to the magnitude of the specific spectrum content (for example, the content of harmonic components and the content of noise components), and the frequency components corresponding to the spectrum groups of a plurality of specific frequency bands corresponding to the characteristic formants The data may be data corresponding to the shape of the waveform from the start of sound generation to the end of sound generation, or the like.

The melody part automatic performance information MP
In the case of, instead of the base data BA in FIG.
Key number data KN corresponding to the pitch of the melody sound is stored. In the case of the automatic performance information MP of the chord part, chord type data CT, chord root data CR and chord data CP are stored instead of the base data BA in FIG.

14. Base Pattern Memory 33 of Second Embodiment Various base pattern data BP are stored in the base pattern memory 33 of the present embodiment. In addition,
The base pattern memory is also provided in the RAM 6, and the ROM 7
The base pattern data BP may be copied and stored, or base pattern data created by a manual operation, or base pattern data input from an external device via the MIDI circuit 9 may be stored.

As shown in FIG. 13, the base pattern data BP stored in the base pattern memory 33 is
This is almost the same as the base pattern data BP in the automatic performance information MP shown in FIG. However, while the base data BA in the automatic performance information MP is a constituent sound of a chord to be played, the key number data K in the base pattern data BP stored in the base pattern memory 33 is different.
N is key number data of any of the constituent sounds of the reference chord. In this embodiment, as in the first embodiment, the reference chord is a chord whose chord is the sound "C", such as "C major", "C minor", "C seventh", "C minor seventh", etc. It is.

In the code base processing (step 208) described later, the key number data KN in the base pattern data BP read from the base pattern memory 33 is shifted according to the code root of the ensemble code. You.

15. Automatic Performance Process in Second Embodiment FIG. 14 is a flowchart of the automatic accompaniment mode in the automatic performance process (step 118) in the main routine shown in FIG. It should be noted that in the fully automatic performance mode and the automatic performance mode of other parts such as the melody part, substantially the same processing as the processing in FIG. 14 is performed.

First, it is determined whether or not the automatic performance mode is set based on the contents of the mode flag MF stored in the mode flag register 41 (step 200). In the automatic performance mode, the time counter 4
It is determined whether or not the time count data TM of No. 7 has reached the step time data ST in the event data stored in the reproduction buffer register 43 (step 202).

If the time count data TM has reached the step time data ST, the contents of the event data in the reproduction buffer register 43 are determined (step 204).

In the case of the automatic chord performance mode, event data of a chord part or a base part corresponding to a beat is stored in the reproduction buffer register 43 from the automatic performance information MP by the processing of step 218 described later. ing. At the time of a chord event, the chord part and the base part event data are stored in the reproduction buffer register 43.

In the case of the semi-automatic chord playing mode or the manual chord playing mode, event data corresponding to a beat in the base pattern data BP read from the base pattern memory 33 is stored. At the time of a chord event, the chord data CP of the played or specified chord is stored in the reproduction buffer register 43 together with the event data of the base part.

The base pattern data BP is the base pattern data BASE NO. Stored in the base pattern memory 33. 1 to BASE NO. This is data of a base pattern selected from among n by a base pattern selection key or a base pattern selected according to the type of the selected rhythm performance.

If the content of the event data is the code data CP or the base data BA, a code / base process is performed next (step 208). In the chord base processing (step 208), in the case of the automatic chord performance mode, the chord sound and the bass sound are generated / mute in accordance with the automatic performance information MP.
Automatic accompaniment is performed.

In the case of the semi-automatic chord playing mode or the manual chord playing mode, a musical tone of a designated or played chord is produced and a bass tone corresponding to a chord route is produced. In addition, this code
In the base processing (step 208), as described later,
When the chord is changed, a process of changing the pitch of the bass to a pitch corresponding to the chord root is also performed.

On the other hand, if the tone data in the reproduction buffer register 43 is the bar mark data BM in step 204, the tempo beat data TB corresponding to the time signature data included in the bar mark data BM is written into the tempo beat register 46. (Step 210).

Then, the next tone data is read out, and if this data is also bar mark data BM (step 2).
12) "1" indicating the bar standby mode is set in the mode flag MF of the mode flag register 41 (step 214). Thereby, the bar standby mode operation is performed.

Further, in step 204, if the tone data in the reproduction buffer register 43 is the tone number data TN, the tone number data TN is written in the reproduction tone number register 45 (step 2).
16). The process of step 216 is also executed when the automatic performance process is started. Automatic performance information MP
Is stored at the head of the tone number data TN.

If the bar mark does not continue at step 212, after execution of step 214 or after execution of step 216, the time count data TM of the time counter 47 is incremented and the next event data is read. It is.

If the read event data is data relating to a code, it is written into the code type register 50, the code route register 51, and the reproduction buffer register 43. If the data is data relating to the base, the base data register 52, the reproduction buffer The data is written to the register 43 (step 218).

Then, the process returns to step 202, and after the step time elapses, a process corresponding to the next event written in the reproduction buffer register 43 is performed (step 20).
4). Thereafter, by repeating the above-described processing, the automatic performance (automatic accompaniment) is performed until the automatic performance mode is released (stopped).

In the case of a melody automatic performance, end mark data is used instead of return mark data RT described later. In this case, the above step 2
If this end mark data is determined in 04, then
Based on the contents of the mode flag MF of the mode flag register 41, it is determined whether or not the mode is the automatic performance mode. If it is determined that the mode is the automatic performance mode, the mode flag MF is cleared, thereby stopping the melody automatic performance operation.

16. Chord Base Processing (Semi-Automatic Chord Performance Mode and Manual Chord Performance) FIG. 15 shows the code base processing (step 208) performed in the automatic performance processing (step 118).
3 shows a flowchart of the semi-automatic chord playing mode and the manual chord playing mode. This process is executed when the automatic play mode is selected by operating the auto play key and the semi-automatic chord playing mode or the manual chord playing mode is selected by operating the mode key. This automatic performance processing (step 11)
Step 8) may be executed at step 156 in the cycle interrupt processing.

In the following description, as in the case of the first embodiment, for example, the automatic accompaniment of a tune of 4/4 time is used as shown in FIG.
As shown in (A), the base pattern is a pattern that changes to "do (C), tho (G), mi (E), tho (G)" for each beat, and is automatically played in the C major. The following describes an example in which the chord is changed to F major at the fourth beat when the player is playing. Similar processing is performed when other code changes are made.

As described above, when the F major chord is played or specified on the fourth beat of the C major accompaniment, the played or specified chord is detected in the key-on process (FIG. 7). (Steps 136, 144). Then, the playback buffer register 43 stores key number data KN (code data CP) of the performance sound or the constituent sound of the specified chord. As a result, the code data CP is read from the reproduction buffer register 43 in step 204 of FIG. 14, and the code base processing (step 208) is executed.

This code base processing (step 20)
8) First, the code event flag register 5
3 is read, and it is determined whether or not a code event has occurred based on the code event flag CF (step 23).
0).

When a chord is played or specified, the chord event flag CF is set to "1" in the key-on process (FIG. 7) (step 138 in FIG. 7). Thus, the determination in step 230 is Y
Then, the code event flag CF is cleared to "0" (step 232), and the code route data CR written in the code route register 51 is read (step 234).

Then, the chord data CP of the performance or the specified chord stored in the reproduction buffer register 43 and the key number data KN corresponding to the chord root CR serving as the bass tone are written into the assignment memory 31 (step S1). 244). In this case, the touch data T
C, step time data ST, gate time data G
T and other data are also written to the assignment memory 31.

Each data in the reproduction buffer register 43 is sent to the assignment memory 31,
It is output via the IDI interface 9 (step 244). At this time, the reproduction tone number register 45
Of the tone number data TN of the assignment memory 31
Sent to

As described above, when the F major chord is played or specified on the fourth beat of the accompaniment of the C major, the step shown in FIG. At 218, the event data at the address corresponding to the fourth beat of the base pattern data BP is read from the base pattern memory 33 and
Is stored in The base data BA is written in the base data register 52.

Then, instead of the base data BA of the fourth beat, the key number data KN corresponding to the code root CR is written to the assignment memory 31 as the key number data KN of the base (step 24).
4). Thereby, the bass sound of the bass pattern data BP is changed to a sound corresponding to the chord route.

The key number data KN corresponding to the chord root CR is key number data of the same pitch as the chord root CR or key number data of a sound shifted by a predetermined pitch. For example, since the range in which the bass sound can be produced is limited to one octave of the lowest range, the chord root C
If R is a pitch in a range higher than the range of the bass tone, the pitch of the bass has the same pitch name as the chord root CR and is 1
The pitch is lowered by an octave or two or more octaves.

The tone generator 10 generates tone data according to the contents stored in the assignment memory 31. As a result, the designated F major chord tone is generated, and a tone having a pitch corresponding to the chord root is generated as the bass tone. As described above, when the F major chord is played or specified on the fourth beat of the accompaniment of the C major, as shown in FIG. The pitch is changed to the pitch of "F (F)" which is the chord root of the F major.

As described above, when the chord performance changes, the chord data CP is sent to the tone generator 10 and the chord performance corresponding to the chord event is started. The pitch can be switched according to the chord route. This allows
When a chord is changed, it is possible to prevent a sound other than the chord root from being emitted as a bass sound, and to prevent the bass sound from causing a sense of incongruity with the chord sound.

Next, the time count data TM of the time counter 47 is incremented, event data corresponding to the next beat in the base pattern data BP is read out, and the base data register 52 and the reproduction buffer register 43 store the event data. Written (step 24
6).

Step 246 is followed by step 236
It is determined whether or not the time count data TM of the time counter 47 has reached the step time data ST set in the reproduction buffer register 43.

If the time count data TM has reached the step time data ST, the contents of the event data in the reproduction buffer register 43 are determined (step 238). Here, if the content of the event data is the key number data KN of the base pattern data BP, the code route data C
The key number data KN is shifted according to R (step 240).

That is, the base pattern data BP is
Since the data is the development pattern data of the reference chord, the pitch difference between the chord root “C” of the reference chord and the chord root of the designated chord is obtained, and the pitch of each tone forming the bass pattern is calculated. The pitch is shifted by this pitch difference (step 240).

For example, as described above, when the key is pressed to designate the F major, the chord root “F” of “F major” has two notes with respect to the chord root “C” of “C major”. Half high. Therefore, "do (C), tho (G),
Mi (E), Soo (G) "base pattern data BP
Is changed to a two and a half tone higher pitch. However, since the bass sound is limited to one octave in the lowest range, a sound exceeding the bass range is regarded as a sound one octave lower. Therefore, the base pattern data BP is “F (F), D (C), L (A), D (C)”.

As described above, the chord tone of C major 4
If the chord is changed to F major at the beat, the next event is the first beat, so at step 240, the first beat of the reference code, "do (C)", is shifted by two and a half notes. The key number data of “F (F)” is obtained. Then, the key number data KN of "F (F)" is written into the assignment memory 31 together with the touch data TC, the step time data ST, the gate time data GT, and the like (step 244). At this time, the data sent to the assignment memory 31 is output via the MIDI interface 9 (step 244).

The tone number data TN of the reproduction tone number register 45 is also sent to the assignment memory 31. Then, tone data according to the contents stored in the assignment memory 31 is generated by the tone generator 10. As a result, the sound of the first beat of the bass sound “F (F)” is generated. Note that the chord sound of the F major is continuously sounded from the fourth beat of the previous bar.

Next, the time count data TM of the time counter 47 is incremented, whereby the event data of the second beat in the base pattern data BP is read out and written into the base data register 52 and the reproduction buffer register 43. (Step 246).

When the time count data TM reaches the step time data ST (step 23).
6) The event data of the second beat is read from the reproduction buffer register 43, the key number data KN is shifted according to the chord route (step 240), and sound is generated (step 244).

In other words, the second beat “SO (G)” of the base pattern data BP “DO (C), SO (G), MI (E), SO (G)” is raised by two and a half notes. It is shifted to "C" by lowering it by one octave. Then, the base sound of the second beat is generated (step 244), and the event data of the base sound of the third beat is read out and written into the base data register 52 and the reproduction buffer register 43 (step 246). ). Thereafter, the bass sound of the third and subsequent beats is similarly generated. The chord sound is not changed until the next chord event, and the chord sound of the F major is continuously emitted.

On the other hand, if the time count data TM has not reached the step time data ST in step 236, the process returns to the main routine, and other processing is performed until the time count data TM reaches the step time data ST. During this time, if there is a new code change,
A chord tone is changed and a bass tone having a pitch corresponding to the chord root is generated (steps 230 to 234).

Thereafter, the above processing is repeated, and if there is a chord event, the chord tone is changed and the bass tone is changed to a chord root or a pitch corresponding to the chord root (steps 234, 244). At times other than at the time of the chord event, the key number data KN of the bass sound is shifted according to the pitch difference between the chord root and the chord root of the designated chord (step 240).

As described above, after the bass performance is switched to the chord root or the pitch corresponding to the chord root at the time of the chord event, until the next bass tone event occurs,
The bass performance of the pitch corresponding to the chord route is continued. After that, the operation returns to the operation of performing the bass performance according to the base pattern data BP.

If the return mark data RT of the base pattern data BP has been read in step 238, the head event data of the base pattern data BP is read (step 242). As a result, the bass sound is generated again from the first beat (steps 236 to 236).
244). Therefore, the same pattern of bass sound is repeatedly emitted until the base pattern is changed by the next base pattern selection key.

In this embodiment, for example, FIG.
In the case of a retrigger as shown in FIG. 1 (C), a musical tone having a pitch corresponding to a chord root is generated as a bass tone when a chord is changed. Also, when there is a code event,
Even if it is not the sounding timing of the bass sound, the bass sound is changed to a chord root or a pitch corresponding to the chord root (steps 230 to 234, 244).

For example, if the base pattern data BP is 4
If the first and second beats are “do (C)”, the third beat is “so (G)” and the fourth beat is “rest”, the fourth beat When the C major is changed from the F major to the F major, the bass tone is not "rest" but the sound of the chord root "F (F)" of the F major is generated.

17. Chord-base processing (in the case of the automatic chord playing mode) In the case of the above-mentioned automatic chord playing mode, the automatic performance information MP including the data of the chord part and the data of the base part is read out serially from the automatic performance memory 8. The chords are switched in the order determined by the automatic performance information MP, and the automatic performance of the chord performance and the bass performance is performed.

As described above, the base data BA in the automatic performance information MP is different from the base pattern data BP stored in the base pattern memory 33, and the key number data of the pitch corresponding to the chord to be played. KN. For example, when the chord data CP is “C major”, base data BA such that the bass performance is, for example, “do (C), tho (G), mi (E), tho (G)” is stored, and When the data CP is “F major”, the base data BA is stored such that the bass performance is, for example, “fa (F), do (C), la (A), do (C)”.

Therefore, there is no need to shift the key number data KN of the base part according to chord changes as in the case of the semi-automatic chord playing mode and the manual chord playing mode. Therefore, the flowchart in the case of the automatic chord playing mode is such that step 240 in the chord base processing (step 208) shown in FIG. 15 is omitted.

In the automatic chord playing mode, the chord is switched in accordance with the automatic playing information MP, so that the chord event flag CF is reset.
Therefore, when the chord is switched in accordance with the automatic performance information MP, steps 236, 238, 2 in FIG.
A new chord tone is generated by the process of 44.

In this case, as in the case of the semi-automatic chord playing mode and the manual chord playing mode, when the chord is designated by pressing a key in the chord designation area or operating the chord designation switch, the chord is changed. , The bass tone is changed to the chord root of the changed chord or a pitch corresponding to the chord root (steps 230 to 234, 244).

When the code is changed by pressing the key in the code designation area or the code designation key, the process of shifting the base data BA according to the code route (step 240) is executed after step 238. . The process of shifting the base data BA is performed for a predetermined period after the chord is changed, for example, until the end of the next bar. The base pattern may be changed by operating the base pattern selection key or according to the type of the selected rhythm performance.

18. Other Modifications The present invention is not limited to the above-described embodiment, and can be variously modified without departing from the gist of the present invention. For example, in step 186 of FIG. 9 or step 232 of FIG.
After the sound is produced, the chord event flag CF is set to "0".
Instead of clearing at the end, it may be cleared after two or more notes or one bar has passed. As a result, two or more bass sounds corresponding to the chord route are continued.

In this case, the process of clearing the code event flag CF in steps 186 and 232 is omitted,
Instead, it is executed after step 162 of the processing for each bar. Alternatively, in step 138, the beat counter is cleared, the beat counter is incremented by one in step 152, and the value of the beat counter becomes two tones (two beats) or several tones (several beats) after step 162. And the code event flag CF is also cleared.
Alternatively, if the determination in step 236 in FIG. 15 is YES, step 232 may be performed.

In addition, step 176 in FIG. 9 or FIG.
Code root data C read out in step 234 of FIG.
R may be data shifted in advance by a predetermined pitch so as to be suitable for the bass range. In short, R may be data according to the chord route. Further, steps 184, 186, and 188 in FIG. 9 may be executed after the bass sound is read in step 190. Similarly, FIG.
Steps 230, 232, and 234 of
May be executed when the key number data KN is read. In these cases, step 18
When there is no chord event in step 4 or 230, a process of shifting the key number data KN of the bass sound (steps 192 and 240) is performed.

In the chord base processing (steps 156 and 208) of FIG. 9 or FIG. 15, when the chord is changed, the bass tone is changed to a pitch corresponding to the chord root of the changed chord ( Steps 188, 194, 2
34, 244), when there is a key-on event of the next bass sound, the base pattern data BP is returned in the order of the base pattern data. This is performed until a predetermined timing or until there are two or more key-on events. May be continued for a predetermined amount and then returned in the order of the base pattern data BP.

Further, in the second embodiment, the example in which the pitch of the bass performance is changed to the pitch corresponding to the chord root when all the chord events have occurred, May be restricted. For example, in the semi-automatic chord playing mode, when a chord is designated or changed by operating a chord designation key or a chord designation switch provided in addition to the chord designation key, and when the chord is designated or changed in the manual chord playing mode. At this time, the pitch of the bass performance may be changed to a pitch corresponding to the chord route. In this case, in the automatic chord playing mode, during the chord base processing of FIG.
234 are omitted.

Also, in the second embodiment, as in the first embodiment, the code data CP in the code pattern memory 34 may be used as the code data CP relating to the reference code. In this case, also in the second embodiment, when producing a chord tone, the chord data CP read from the chord pattern memory 34 is shifted according to the chord route.

Further, in each of the above-described embodiments, the base pattern data BP in the base pattern memory 33 or the data in the code pattern memory 34 is replaced with the base pattern data BP for all codes, not only data corresponding to the reference code. Alternatively, it may be code data CP. Although a large memory capacity is required, a process of shifting the base data BA according to the code route (FIG. 9)
(Step 192 in FIG. 15, step 240 in FIG. 15) or the process of shifting the code data CP according to the code route (steps 176, 178 in FIG. 9, step 1 in FIG. 7)
Steps 176 and 178 inserted after 44 are unnecessary.

Further, when data for changing the code is input via the MIDI circuit 9, based on the code data CP input via the MIDI circuit 9,
The same processing as in the above embodiments may be performed.

In the second embodiment, the performance data of the base pattern is reproduced. However, the performance information of the code pattern is reproduced. Each of the code data is stored in the code pattern memory 34 of FIG. Pattern memory 3
3 may be changed and each key number data KN may be sent to the tone generator 10. In this case, the performance information of the chord pattern has the form shown in FIG. 12 or 13, and the chord data CP is stored instead of the base data BA of FIG.

[0169]

As described above in detail, according to the present invention, when a chord is changed, the bass pitch is changed to the same pitch as the chord root of the changed chord or a pitch corresponding to the chord root. Things. Thus, when a chord is changed, a sound other than the chord root is prevented from being emitted as a bass sound, and the pitch of the bass sound is changed to a pitch that does not cause a sense of incongruity with the changed chord sound.

[Brief description of the drawings]

FIG. 1 is a diagram showing an entire circuit of an electronic musical instrument.

FIG. 2 is a diagram showing a code pattern memory 34;

FIG. 3 is a diagram showing a base pattern memory 33.

FIG. 4 is a diagram showing an assignment memory 31;

FIG. 5 is a diagram showing a working memory 32 of a RAM 6;

FIG. 6 is a diagram showing a flowchart of a main routine.

FIG. 7 is a diagram showing a flowchart of a key-on process.

FIG. 8 is a diagram showing a flowchart of a cycle interrupt process.

FIG. 9 is a diagram showing a flowchart of a rhythm code base process.

FIG. 10 is a musical note diagram showing an example of a bass performance when no chord is changed and a bass performance when a chord is changed.

FIG. 11 is a musical note diagram showing a bass performance when a chord change is inside, a bass performance when a chord is changed by a re-trigger in the conventional system, and a bass performance when a chord is changed by a re-trigger in the first embodiment.

FIG. 12 is a diagram showing automatic performance information MP.

FIG. 13 is a diagram showing base pattern data BP.

FIG. 14 is a view showing a flowchart of an automatic performance process.

FIG. 15 is a diagram showing a flowchart of a code base process.

FIG. 16 is a musical note diagram showing an example of a bass performance when there is no chord change in a conventional system and a bass performance when a chord is changed.

[Explanation of symbols]

1 ... keyboard, 3 ... panel switch group, 5 ... CPU,
6 RAM, 7 ROM, 8 automatic performance memory, 10 ...
Tone generator, 11 ... Sound system, 14 ...
Timer circuit, 31: assignment memory, 32: working memory, 33: base pattern memory.

Claims (7)

[Claims] 1. A method for reading and outputting a stored performance content of a bass, for reading and outputting a stored performance content of a chord, or outputting a performance content of an operated chord. Detects whether chord performance has changed,
If the chord performance changes, the output bass performance will be
Switching to a bass performance corresponding to the chord route of the changed chord performance, and, when the bass performance is continued for a predetermined amount, returning the bass performance to the original bass performance content; apparatus. 2. The automatic performance according to claim 1, wherein the bass performance according to the chord root is a chord root tone as the bass tone or a tone shifted from the chord root tone by a predetermined pitch. Performance equipment. 3. The automatic performance apparatus according to claim 1, wherein the base performance according to the chord route is executed even when the bass performance is not at the timing of sound generation. 4. An automatic chord performance for reading and outputting the contents of a stored chord, a semi-automatic chord performance for detecting and outputting a selected chord performance, or a manual operation. 4. The automatic performance device according to claim 1, wherein the automatic performance device performs a manual chord performance for directly outputting the performed content of the chord. 5. In the bass performance, a bass performance pattern is stored at a predetermined reference pitch, a chord route of the output chord performance is detected, and each pitch of the bass performance pattern is determined. 5. The automatic performance apparatus according to claim 1, wherein the shift is performed in accordance with a difference between a detected pitch of the chord root and the reference pitch. 6. The chord performance includes storing a chord performance pattern at a predetermined reference pitch, detecting a designated chord root, and rewriting each pitch of the chord performance pattern to the detected chord. 6. The automatic performance apparatus according to claim 1, wherein the shift is performed in accordance with a difference between a pitch of a root and the reference pitch. 7. A method for reading out automatic performance information including stored chord data and base data, generating tone data relating to an automatic performance according to the read automatic performance information, and generating a tone. For each of the plurality of sounding operation means for performing the above operation, the chord input by the operation of the sounding operation means corresponding to the constituent sound of the chord is detected, and the detected chord is stored. The chord information determined corresponding to the sounding operation means in the chord designation area provided in part or all is stored, and the chord information corresponding to the sounding operation means operated in the chord designation area is read out. In this way, the tone data relating to the chord performance according to the read chord information is generated, and the tone of the scale of the reference chord is generated. The stored base pattern data is stored, and the stored code or the base pattern data corresponding to the read code information is read, and the pitch of the read base pattern data is determined. The pitch is shifted in accordance with a pitch difference between the code root of the stored code or the read code information and the code root of the reference code, and the base pattern data with the shifted pitch To generate tone data according to the bass performance according to the tone data, to output a tone according to each of the generated tone data, and to operate the tone operating means corresponding to the constituent sounds of the chord. Operation, operation of the sounding operation means in the chord designation area, operation of a predetermined chord designation operator, It is detected that the chord is specified or changed by an external input, or that the chord data in the automatic performance information is read, and that the chord data is read or the chord is read. When it is detected that the designation or change of the code is performed, the read code or the code route of the designated or changed code is detected or read, and that the code data is read, Or, when it is detected that the designation or change of the chord is instructed, the pitch of the tone data relating to the generated bass performance is shifted by a predetermined pitch to the detected or read chord route or chord route. The pitch is changed to the pitch that has been changed, and the bass performance with the changed pitch continues for one tone or a predetermined amount. When the continuation detection detects that the bass sound whose pitch has been changed has been continued for one sound or a predetermined amount, the generated pitch of the generated bass performance is calculated as follows: An automatic performance device for returning to a pitch corresponding to the automatic performance information or the base pattern data.