JPH06110463A - Automatic accompaniment device - Google Patents

Abstract

PURPOSE:To provide an automatic accompaniment which is superior in musicality by selecting a base sound matching a new chord when the new chord is specified halfway in a previously stored accompaniment pattern. CONSTITUTION:When the new chord is specified at a change point of measures halfway in the accompaniment pattern, 4-bit data showing the pitch of the base sound in a pitch data register BASSON is replaced in a step S226 with data in the high-order 4-bit CCH area of a register CHORDCODE stored with the pitch of the root of the newly specified chord. In a step S2128, the pitch of a base sound read out of an accompaniment pattern ROM to a pitch data register BASSON is described with a chord C. Then the 4-bit data showing the pitch of the base sound in the pitch data register BASSON is converted in S227 so that the pitch of the base sound based upon the chord C corresponds to a specified chord kind, and the start of sounding is instructed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic accompaniment device for an electronic musical instrument such as an electronic keyboard.

[0002]

2. Description of the Related Art Conventionally, in an automatic accompaniment of an electronic musical instrument, a performer selects an accompaniment pattern stored in a memory in advance and presses an accompaniment key while playing a melody to specify a specified chord (chord). Has an automatic accompaniment function according to the accompaniment pattern.

A concrete example thereof is shown in FIG.
Description will be given using the musical score example (No. 4) of FIG. First, Fig. 1
The case of 8 will be described.

FIG. 18 (a) shows an accompaniment pattern based on a chord C (long third chord having the C sound as a root note) having a base sound of a C sound (pitch is C3), and its musical tone data is previously accompaniment pattern. It is stored in ROM. Then, as shown in FIG. 18 (b), when the performer presses the accompaniment key of chord C to specify,
The accompaniment is automatically played in the pattern as shown.

Codes other than the code C, such as Am
If you specify (Short triad with A as root) or Dm (Short triad with D as root) by pressing the accompaniment key,
The pitch data of each constituent note of chord C is rewritten so that the chord data corresponding to the accompaniment key is changed,
Automatic accompaniment is performed.

Next, the case of FIG. 21 will be described. FIG. 21 (a) is another example of an automatic accompaniment pattern based on chord C, in which the first beat of the bass note is the root note of chord C, and the second and third beats are the fifth note of chord C. ing. And FIG.
When the performer specifies the accompaniment key of chord C by pressing the accompaniment key as shown in 1 (b), automatic accompaniment is performed in a pattern as shown in FIG. 21 (a), and chords other than chord C, such as Am and Dm
, Etc., the pitch data of each constituent note of chord C is rewritten so that the chord data corresponding to the pressed accompaniment key is changed, and the automatic accompaniment is performed in the pattern as shown in FIG. 21 (a). Is done.

[0007]

In the above-mentioned conventional example, the bass note is only the root note of the designated chord, and a new chord designation by the performer is performed in the middle of the accompaniment pattern, as in the example of FIG. If there is not, and the timing at which the repeated accompaniment pattern returns to the starting point and the timing for chord designation match, no inconvenience occurs. However,
A problem occurs in the case of the accompaniment pattern of the musical score shown in FIG.

In FIG. 19, the accompaniment pattern extends over two measures, the bass note of the first measure is the root note of the designated chord, and the bass note of the second measure is the fifth note of the chord. Therefore, in the case of the musical notation of FIG. 20 using such an accompaniment pattern, the 5th bar corresponds to the 2nd bar which is in the middle of the accompaniment pattern starting from the previous bar, and the bass sound is the specified chord of the 5th bar. 5th sound, that is, the fifth sound A2, which is the fifth sound of chord D, is generated. Similarly, at bar number 7, B2, which is the fifth note of chord E7 of the previous bar
The sound is pronounced.

Next, the first measure of the accompaniment pattern of FIG. 19 is the basic form of the C code. First, the root note of the C code is pronounced at the first beat, and then the other C codes are pronounced. The second bar is the second expanded form of the C code, and the fifth tone of the C code is sounded at the first beat, and then the other C codes are sounded.

As described above, when the same chord, including the expanded form, extends over several measures, for example, two measures as the accompaniment sound of the dispersive tone type, 1 of the bass pattern of the first measure of the chord.
If the beat is a root note, even if a sound other than the root note (fifth note in FIG. 19) is pronounced as the bass note after the second measure, it is extremely natural in music.

However, in the example shown in FIG. 20, a new chord is specified at the beginning of the 5th bar in the middle of the accompaniment pattern starting from the 4th bar. In such a case, a bass note that is not the root note of the chord specified by the performer is produced,
As a result, the harmony of the harmony is lost, and there is a problem in that it is unnatural in music.

In the case of the example shown in FIG. 22, the second measure,
At the 5th bar and the 7th bar, a new chord is specified in the middle of the accompaniment pattern, that is, at the third beat of each bar. As a result, the bass note at the third beat is not the root note of the designated chord, and the fifth note is sounded. As a result, the harmony of the harmony progression disappears as in the case of FIG. There is a problem that there is.

An object of the present invention is to automatically select a bass tone suitable for a chord when a new chord is specified in the middle of an accompaniment pattern stored in advance so that a musically excellent automatic tone can be selected. To enable accompaniment.

[0014]

According to the present invention, a series of accompaniment pattern data constituting an accompaniment pattern is sequentially and repeatedly read from an accompaniment pattern data storage means, and the read accompaniment pattern data is read by a performer using an accompaniment key or the like. It is premised on an automatic accompaniment device that sequentially produces automatic accompaniment tones by sequentially converting the chord information based on the designated chord information.

First, there is provided a bar head identifying means for identifying the accompaniment pattern data at the timing of the bar head in the accompaniment pattern. Next, the pitch of the bass tone of the accompaniment pattern data read out from the accompaniment pattern data storage means is constructed so that the pitch becomes the pitch corresponding to the chord information most recently designated by the performer. It has an accompaniment pattern data normalization means for performing normalization using, for example.

Further, when the performer newly specifies chord information with respect to the accompaniment pattern data read from the accompaniment pattern data storage means and identified by the measure head identification means at the timing of the beginning of the measure. And accompaniment pattern data replacement means for replacing the pitch of the bass note of the read accompaniment pattern data with the pitch of the root note corresponding to the newly designated chord information.

It should be noted that without providing the above-mentioned measure head identification means,
At the timing when the performer newly specifies chord information for the accompaniment pattern data read from the accompaniment pattern data storage unit, the pitch of the bass tone of the read accompaniment pattern data is unconditionally renewed. The accompaniment pattern data replacement means may be configured to replace the pitch of the root note corresponding to the specified chord information.

The accompaniment pattern data normalizing means or the accompaniment pattern data replacing means includes an automatic accompaniment sound generating means for generating an automatic accompaniment sound based on the accompaniment pattern data.

In the above-mentioned configuration of the present invention, the accompaniment pattern data replacement means corresponds the pitch of the bass note of the accompaniment pattern data read from the accompaniment pattern data storage means to the chord information newly designated by the performer. The pitch of the root note or a pitch having an octave relationship with the pitch, and the accompaniment read from the accompaniment pattern data storage unit immediately before the accompaniment pattern data currently read from the accompaniment pattern data storage unit. The pitch can be replaced with the pitch closest to the pitch of the automatic accompaniment sound generated by the automatic accompaniment sound generation means based on the pattern data.

The accompaniment pattern data replacement means is
Accompaniment pattern data read out from the accompaniment pattern data storage means immediately before the accompaniment pattern data currently read out from the accompaniment pattern data storage means, when the pitch of the root note corresponding to the chord information newly designated by the performer. On the other hand, if the pitch of the root note corresponding to the chord information most recently specified by the player is the same, the pitch of the bass note of the accompaniment pattern data read from the accompaniment pattern data storage means is not changed. Can be configured as.

Alternatively, it further comprises accompaniment pattern head identification means for identifying the accompaniment pattern data at the head of the accompaniment pattern, and the accompaniment pattern data replacement means is read from the accompaniment pattern data storage means and identified by the accompaniment pattern head identification means. When the performer newly specifies the chord information for the accompaniment pattern data at the head timing of the accompaniment pattern, the pitch of the bass tone of the accompaniment pattern data read from the accompaniment pattern data storage means is changed. It can be configured not to.

On the other hand, the operation of the accompaniment pattern data replacement means may be further provided with accompaniment pattern data replacement operation determination means for determining according to the accompaniment pattern selected by the performer.

Further, the operation of the accompaniment pattern data replacement means can be configured to further include accompaniment pattern data replacement operation designating means for causing the performer to specify.

[0024]

As a first aspect of the present invention, when a new chord is designated at a transition of a bar in the middle of the accompaniment pattern, the bass note is forcibly rewritten to the root note of the designated chord.

As a second aspect of the present invention, not only at the beginning of a bar, but when a new chord is specified, the bass tone is unconditionally rewritten as the root note of the chord. As a third aspect of the present invention, in the above-mentioned first or second aspect,
When the bass note is rewritten to the root note of the specified chord, it is generated based on the pitch of the root note or a pitch that has an octave relationship to the pitch and is the previous accompaniment pattern data. It is replaced with the pitch closest to the pitch of the played automatic accompaniment sound.

As a fourth aspect of the present invention, in the above-mentioned first to third aspects, when the root note of the chord previously designated and the root note of the chord newly designated this time are the same, The note is not replaced by the root note of the specified chord.

As a fifth aspect of the present invention, in the above-mentioned first to fourth aspects, when a new chord is designated at the timing of the beginning of the accompaniment pattern, the base tone is designated. It cannot be replaced with the root note of a chord.

As a sixth aspect of the present invention, various bass tone replacement operations shown in the first to fifth aspects are automatically determined according to the accompaniment pattern selected by the performer. .

As a seventh aspect of the present invention, the performer arbitrarily designates the replacement operation of the various bass sounds shown in the above-mentioned first to fifth aspects. Further, the automatic setting of the bass tone replacement operation according to the accompaniment pattern shown in the above-described sixth aspect is arbitrarily changed by the performer.

[0030]

Next, six embodiments according to the present invention will be described with reference to the drawings. <Structures of First to Sixth Embodiments> The structures of these embodiments are all the same and are shown in the block diagram of FIG.

In FIG. 1, a CPU (Central Processing Unit) 104 first loads a program written in a ROM (Read Only Memory) 102 into a RAM (Random Access Memory).
The emoy) 103 is executed as a work memory to control other units. The switch unit 105 is composed of various switches necessary for performance and automatic accompaniment.

The CPU 104 scans these switches and the keyboard 101 to play data when the performer operates the keyboard 101, the accompaniment key number to be pressed for automatic accompaniment, key release, and release. Get key information etc. Then, based on these pieces of information, the CPU 104 reads from the accompaniment pattern ROM 111 the automatic accompaniment pattern data based on the chord specified in accordance with the melody played by the performer, in synchronization with the tempo clock generated by the timer 106, and outputs the melody. Sound source section 1 with musical sound data
It outputs to 07.

Next, based on the accompaniment pattern data output from the CPU 104 and the tone data of the melody played by the performer, the tone generator 107 creates a tone signal having a predetermined pitch, tone color and amplitude envelope. , D / A converter 108 converts the analog tone signal, and then a tone is emitted from the speaker 110 via the amplifier 109. <Operation of First Embodiment> Next, the operation of the first embodiment based on the above configuration will be described with reference to the operation flowcharts of FIGS.

The first embodiment is characterized in that when a new chord is designated at a transition of a measure in the middle of an accompaniment pattern, the bass note is forcibly rewritten as the root note of the designated chord.

4 and 5 are diagrams showing the contents of the registers provided in the CPU 104, which are used in the subsequent operation flowcharts. The data of the base pattern area in the accompaniment pattern ROM 111
Before describing the operation flow chart of the over data configuration diagram 2 and 3, firstly, where the Figure 1 used accompaniment pattern ROM
The data structure of the base pattern area in 111 will be described.

Now, as shown in FIG. 6, in one page in the base pattern area of the accompaniment pattern ROM 111, the relative address 0000H ...
Any address 00xyH (x and y are any hexadecimal numbers)
In addition, accompaniment information of the bass pattern for one repeating unit is stored.

The accompaniment information of the bass pattern is pitch data BAS indicating the pitch of the bass tone for each note of the bass tone.
SON, note length data BASSL indicating the note length from the start time of the bass note to immediately before the next bass note to be sounded
N, and articulation data BASSAT indicating the note length (pronunciation length) of the bass note are stored.

Here, the note length data BASSLN and the articulation data BASSAT are expressed with a note length of 1/24 of a quarter note as one unit. For example, as shown in FIG. 18, when the bass pattern is composed of one measure, the page corresponding to the above pattern in the bass pattern area of the accompaniment pattern ROM 111 is first written with the first dotted quarter note. As the accompaniment information of the bass sound shown, the pitch data BASESON = C3,
Note length data BASSLN = articulation data BASSAT = sound length of one dotted quarter note is stored.

Next, as the accompaniment information of the bass note represented by the second eighth note, the pitch data BASESON = C3.
, Note length data BASSLN = articulation data BASESAT = note length of one eighth note is stored.

Then, as the accompaniment information of the bass note indicated by the third quarter note, the pitch data BASSON = C
3, note length data BASSLN = note length of two quarter notes,
Articulation data BASSAT = the length of one quarter note is stored. In the third bass note, the note length indicated by the note length data BASSLN is one quarter note longer than the note length indicated by the articulation data BASSAT, resulting in a note corresponding to one quarter note in the first half. This bass tone is sounded in the long section, and the note length section for one quarter note in the latter half becomes a rest (quarter rest) as shown in FIG.

Here, the third bass tone is the last tone of the bass pattern. In this way, when the bass sound indicates the end of the bass pattern, "1" is set in the most significant bit (MSB) of the pitch data BASSON of the bass sound.

Further, for example, as shown in FIG. 19, when the bass pattern is composed of two measures, the page corresponding to the above pattern in the bass pattern area of the accompaniment pattern ROM 111 is first (first). As the accompaniment information of the bass note indicated by the quarter note of the 1st measure), the pitch data BASSON = C3 and the tone length data BASSLN = 4
Duration of three quarter notes, articulation data B
ASSAT = a note length of one quarter note is stored. In this bass note, the note length indicated by the note length data BASSLN is longer than the note length indicated by the articulation data BASSAT by a note length of two quarter notes, resulting in a note length of one first quarter note. This bass sound is produced in the section, and the remaining section of two quarter notes becomes a rest (two quarter notes), as shown in FIG.

Further, as the accompaniment information of the bass note indicated by the second (second measure) quarter note, the pitch data BA
SSON = G2, note length data BASSLN = quarter note 3
Note length, articulation data BASSA
T = The length of one quarter note is stored. Also in this case,
This bass note is sounded in the duration of the first quarter note, and the rest of the second two quarter notes are rests (quarter rests 2
One).

Here, the second bass sound is a sound that separates the first and second measures. In this way, in the case of the present embodiment, when the bass sound divides the bar (it is the first sound of the bar), the pitch data BAS of the bass sound is obtained.
"1" is set to the second bit of SON.

Since the second bass tone is the last tone of the bass pattern, the pitch data B of that bass tone is used.
The most significant bit (MSB) of ASSON is set to "1", which indicates the end of the base pattern.

Note that the pitch data BASSON represents the pitch by the appropriate 4 bits excluding the above MSB and the second bit. Basic sound generation control processing of bass sound As described above, 1 stored in one page address in the bass pattern area of the accompaniment pattern ROM 111.
The base patterns of the set are the steps S202 to S3 of FIG.
By repeating the processing of step S238 of, the data is sequentially read and sounded.

First, the operation of the basic tone generation control process of the bass tone in the processes of the operation flowcharts of FIGS. 2 and 3 will be described. First, when the performer designates one bass pattern in the switch unit 105 of FIG. 1, the page address corresponding to the bass pattern is stored in the page address register BAS in the CPU 104.
Set to SPAGE. Below, the accompaniment pattern ROM
When 111 is accessed, the data in the page indicated by the page address of the page address register BASSAGE is always accessed.

Next, in the series of processes from step S202 in FIG. 2 to step S238 in FIG. 3, the sound generation control for one bass tone is executed by the series of processes once. in this case,
Each relative address in the page address is designated by the relative address register BASSADR in the CPU 104, and the content is first reset to "0" in step S201.

Next, in FIG. 2, step S described later.
After steps 202-S217 are executed, steps S218-
In S223, pitch data for one note, basson,
The tone length data BASSLN and the articulation data BASSAT have the same name in the CPU 10 respectively.
4 is read out to the pitch data register BASSON, the pitch length data register BASSLN, and the articulation data register BASSAT.

That is, in step S218 of FIG. 2, the pitch data stored at the relative address specified by the current relative address register BASSADR is read to the pitch data register BASESON. Next, after the relative address register BASSADR is incremented in step S219, the tone length data stored at the relative address indicated by the relative address register BASSADR is read into the tone length data register BASSLN in step S220. Then, after the relative address register BASSADR is further incremented in step S221, the relative address register BASDR is calculated in step S222.
The articulation data stored at the relative address indicated by SADR is read out to the articulation data register BASSAT.

Further, referring to FIG.
After steps 224 to S227 are executed, in step S228, the sound source unit 107 of FIG. 1 is instructed to start the generation of the bass sound of the pitch indicated by the pitch data register basson.

In step S229 of FIG. 3, the timing is measured until the timer 106 of FIG. 1 generates a tempo pulse having a period of 1/24 of a quarter note. When this tempo pulse is generated, the contents of the tone length data register BASSLN and the contents of the articulation data register BASSAT are decremented in step S230, and the processes of steps S229 to S231 are performed until the contents of the register BASSAT become "0". Repeated.

As can be seen from the above description, in this embodiment, the note length indicated by the note length data BASSLN and the articulation data BASSAT is expressed with the note length of 1/24 of the quarter note as one unit. Has been done.

By the process using the above articulation data, the tone length of the bass tone whose tone is started based on the process of step S228 is controlled, and step S
If the determination in step 231 is YES (Y), step S23.
In 2, the sound source unit 107 is instructed to stop the sounding of the bass sound, and the sounding process of the bass sound is stopped.

Succeedingly, in a step S233, it is determined whether or not the content of the sound length data register BASSLN is "0". If the content of the tone length data register BASSLN is not "0", it is necessary to take a rest timing as described above, so in step S235, the timing is measured until the tempo pulse is generated from the timer 106 of FIG. , When this tempo pulse occurs, step S2
At 38, the contents of the tone length data register BASSLN are decremented, and the processes of steps S233 to S238 are repeated until the contents of the register BASSLN become "0".

By the processing using the above note length data, the rest timing is set, and the determination in step S233 is Y.
When it becomes ES, the process proceeds to step S234. As described above, every time the control for one sound is completed, step S234
If it is not determined that "1" is set in the MSB of the pitch data register BASSON in step S2,
At 36, the contents of the relative address register BASSADR are incremented to provide relative addressing for the next bass note. Then, step S2 of FIG.
Return to 02.

When it is determined in step S234 that "1" is set in the MSB of the pitch data register BASSON, the bass tone for which the tone generation control is completed is the last tone of the bass pattern, as described above. Because there is
The content of the relative address register BASSADR is reset to "0", the process returns to step S202 of FIG. 2, and the reading from the first bass tone of the bass pattern is repeated again. Bass tone determination control process based on chord designation In the repetition of each process of step S202 of FIG. 2 to step S238 of FIG. 3, together with the basic tone generation control process of the bass tone described above, the performer presses the accompaniment key. The process of determining the bass tone to be pronounced based on the chord designation by the, and particularly in relation to the present invention, when a new chord is designated at a transition of a bar in the middle of the accompaniment pattern, the bass tone is designated as the chord. The process of rewriting to the root sound of is executed.

First, steps S202 to S217 of FIG.
Then, it is determined whether the performer has designated a new chord with the accompaniment key, and a new chord is loaded based on the determination.

First, in step S202, "0" is written in the loop count register I and "1" is written in J as well. Subsequently, the CPU 104 performs the following processing.
Find the accompaniment key that was pressed.

That is, in step S203, step S
Whether or not the accompaniment key register KEY (I) indicated by the register I whose value is sequentially incremented from 0 to 15 in 207 is 1, that is, whether or not the I-th accompaniment key is pressed is sequentially. To be judged. For example, if the register I = 0, it is determined whether or not the lowest note C2 key is pressed.

If the key is not pressed, step S203.
Is NO (N), the value of the register I is incremented in step S207 through step S206.

If the key is pressed, the determination in step S203 is YES, and in step S204, the key number indicated by the register I is stored in the accompaniment key depression key information register KEYREG (J) designated by the value of the register J. Written. At first, the value of the register J is 1. After that, the register J is incremented in step S205, and the value of the register I is incremented in step S207 via step S206.

When the value of the register I becomes larger than 15 as a result of repeating the above-described processing, the determination in step S206 becomes YES and the process proceeds to the next step S208. By the above processing, the key number of the accompaniment key pressed by the performer is
Up to four accompaniment key pressing information registers KEYREG
(J).

Subsequently, in step S208, it is determined whether or not the current value of the register J indicating the number of valid data of the accompaniment key depression information register KEYREG (J), that is, the number of depressed keys of the accompaniment key is smaller than "3". To be done.

In the above-mentioned processing, the register KEYREG
If four pieces of accompaniment key pressing information are stored in (J), J =
4, the determination in step S208 is NO,
It proceeds to step S209. And step S209-
In S212, the accompaniment key pressing information register KEYREG
From the four pieces of information stored in (J), the pitch between the accompaniment keys pressed in the following manner is obtained.

First, after the value 1 is assigned to the register I in step S210, in step S210 KEY
By subtracting the key number of the lowest note of the key-accompaniment key stored in KEYREG (1) from the key number of the key-accompaniment key stored in REG (I + 1), the lowest-accompaniment key is replaced with another key. Pitch data up to the key-pressed accompaniment key is generated, and KE
It is stored in YONTEI (I).

After that, the register I is incremented in step S212, the process returns to step S210, and the same processing is repeated until the register I becomes larger than "3".

In this way, when I = 3, the determination in step S211 becomes YES, and step S213
Then, the generated three pitch data between the four depressed keys accompaniment keys are input to the chord judge table in the ROM 102, and the root note and chord type of the chord used for the accompaniment pattern are obtained. For example, in chord E7, the root note is E
The chord type is Sevens (a chord that is a chord that is a third chord plus a note 7 degrees above the root note).

Then, in step S214, the register C is selected from the chord data consisting of the root note and the chord type.
The root note is stored in the upper 4-bit CCH area of the HORDCODE, and the chord type is stored in the lower 4-bit CCL area.

Next, in step S215, the register REGCHORD in which the previous code data is stored,
This time, it is compared with the CHORDCODE newly storing the data, and if they are not equal (the code is designated), the code change flag CCFLA for identifying whether or not the code is designated in step S216.
If the value "1" is assigned to G and both are equal (no code is specified), the value "0" is obtained in step S217.
Is substituted.

As a result, the code change flag CCF
When the value "1" is assigned to LAG, it means that a new code has been designated and the code change flag CC
If the value "0" is assigned to FLAG, it means that no new code has been designated.

Here, if the number of pressed keys is 2 or less and the code does not hold as a result of key scanning, the above-described step S208 is performed.
Is NO, the previous CHORDCODE remains without being cleared, and CCFLAG = 0.

Next, as described above, step S218
After reading the accompaniment information of the bass pattern from the accompaniment pattern ROM 111 in steps S223 to S223, it is determined in step S224 whether "1" is set at the second bit of the read pitch data register BASSON, that is, As described above, it is determined whether or not the read bass sound is the head sound of the bar.

If the determination in step S224 is yes, then in the next step S225, it is determined whether or not the value of the code change flag CCFLAG is "1", that is, whether or not a new code is designated. To be determined.

If the determination in step S225 is also YES, it means that a new chord has been designated at the transition of a measure in the middle of the accompaniment pattern. In this case, step S
At 226, the 4-bit data indicating the pitch of the bass note in the pitch data register BASSON is stored in the register CHOR in which the pitch of the root note of the newly designated chord is stored.
It is forcibly replaced by the data in the upper 4-bit CCH area of DCODE.

If the determination in step S224 is NO, that is, if the read bass sound is not the beginning sound of the bar, or if the determination in step S224 is YES even if the determination in step S225 is NO, That is, if no new chord is designated, the above-described forcible replacement of the pitch of the bass tone is not performed, and step S2 is performed.
27 is executed.

Now, in step S218, the pitch of the bass sound read from the accompaniment pattern ROM 111 to the pitch data register basson is chord C (1 in C major).
Chords). Therefore, step S227
Then, using the constituent sound conversion table in the ROM 102,
The 4-bit data indicating the pitch of the bass tone in the pitch data register BASSON is converted so that the pitch of the bass tone based on this code C becomes the pitch corresponding to the designated chord type.

Then, as described above, step S22
In step 8, the sound source unit 107 shown in FIG. 1 is instructed to start sounding the bass sound having the pitch determined by the processing in step S226 or S227 and indicated by the pitch data register BASSO.

As a result of such control, for example, in the case of the above-mentioned musical notation of FIG. 20, when the chord is changed from G to D at the 4th bar to the 5th bar, the base of the 5th bar is conventionally used. The sound is A which corresponds to the fifth sound of chord G in the 4th measure.
In the case of the present embodiment, it is changed to D (re) sound which is the root sound of chord D. Similarly, the bass sound of the 7th measure is changed from the B (si) sound to the E (mi) sound which is the root note of the chord E7.

In this way, a beautiful accompaniment sound that matches the melody can be obtained. <Operation of Second Embodiment> In the first embodiment, when a new chord is specified at a transition of a bar in the accompaniment pattern, the bass sound is rewritten as the root sound of the specified chord.

Here, when a code such as code C → C7 is specified, the code type is changed,
Since the root sound is the same C sound, there is little change in the bass pattern. Therefore, in some music, it is musically preferable not to rewrite the bass sound performed in the first embodiment.

This point is taken into consideration in the second embodiment, and its operation is shown in the operation flowcharts of FIGS. 7 and 8. Steps S701 to S714 and S7 of FIGS.
16 to S738 are the same processes as S201 to S214 and S216 to S238 in FIGS. 2 and 3 in the first embodiment, and only step S715 in FIG. 7 is different from step S215 in FIG.

In step S215 of FIG. 2 described above, it is compared whether or not the code specified this time is completely equal to the code specified up to the previous time. In step S715 of FIG. 7, the register CHORDCODE is stored. Top 4
The pitch of the root note of the chord newly specified this time, which is stored in the CCH area of the bit, is registered in the register REGCHORD.
It is determined whether or not it is equal to the pitch of the root note of the previous chord stored in the upper 4-bit area of.

Then, if the determination in step S715 is NO, that is, if the root note of the chord data has changed, then in the next step S716, the chord change flag CCFLAG for identifying the chord change is set to "1". Conversely, when the root note of the chord data has not changed, the chord change flag CCFLAG is set to "0" in step S717.

As a result, if the root note does not change even when the chord changes, the determination in step S725 becomes NO, and the pitch of the bass note cannot be rewritten to the root note of the designated chord.

As described above, for example, in the case of a musical score using a bass pattern as shown in FIG. 19, when different chords having the same root note are designated, the base note is the designated chord. Since the fifth note is played instead of the root note, a natural and lively accompaniment sound can be obtained. <Operation of the Third Embodiment> What kind of automatic accompaniment is given to the melody to be played depends on the accompaniment pattern, and also on the musical idea and the subjectivity of the performer.

Therefore, in this embodiment, when the accompaniment pattern is selected, the control of the compulsory rewriting of the bass sound based on the first embodiment and the control of the restriction of the rewriting of the bass sound based on the second embodiment are performed. Whether or not it can be automatically determined according to the accompaniment pattern, and can also be designated by the performer.

9 and 10 are operation flowcharts of the third embodiment. Step S905 of FIG. 9 and FIG.
S927 and S930 to S944 are S201 to S223 and S224 to S23 in FIGS. 2 and 3 in the first embodiment.
The process is the same as 8. 9 and 10, steps S901 to S904 are added as control processing at the time of accompaniment pattern selection, and accordingly, the determination processing of steps S928 and S929 of FIG. 10 is added. different.

In FIG. 9, first, the performer operates a selection switch (not particularly shown) of the switch section 105 of FIG. 1 to select an accompaniment pattern (step S90).
1). First, in step S901, when the performer specifies one bass pattern in the switch section 105 of FIG. 1, the page address data in the accompaniment pattern ROM 111 of FIG. 1 corresponding to the bass pattern is stored in the CPU 104 in step S902. It is set in the page address register BASSPAGE. Hereinafter, when the accompaniment pattern ROM 111 is accessed, the page address register BASSAGE is always used.
The data in the page indicated by the page address is accessed. Here, the page address data corresponding to each accompaniment pattern is stored in the ROM 102 of FIG. 1, for example.

At this time, whether the same control as the rewriting control of the bass sound shown in the first or second embodiment described above is performed on the most significant bit (MSB) of the set page address data. A flag indicating whether or not is stored, and MS
When B = 0, rewriting control of the bass sound is not performed and MS
When B = 1, the rewriting control of the bass sound is performed.

Further, a bit (MSB-1) which is one bit lower than the most significant bit of the page address data to be set.
Stores a flag for selecting whether to perform the rewriting control of the bass sound similar to that of the first embodiment or the rewriting control of the bass sound similar to that of the second embodiment. MSB-1
If = 0, the rewriting control of the bass sound is performed as in the first embodiment, and if MSB-1 = 1, the rewriting control of the bass sound as in the second embodiment is performed.

Then, in the page address data,
The actual page address is indicated by the bits excluding the most significant bit and the bit one bit lower than the most significant bit.

The above is summarized as shown in FIG. That is, the page address register BASSPAGE
MSB and MSB of page address data set to
In the combination of 1, when it is "00" or "01", the rewriting control of the bass tone is not performed, and when it is "10", the rewriting control of the bass tone similar to that of the first embodiment is performed. , "11", the rewriting control of the bass sound is performed as in the second embodiment.

Next, in step S903, the performer
In the switch section 105 of FIG. 1, it is judged whether or not the switch for changing the combination of the above-mentioned page address data MSB and MSB-1 is operated. That is,
Even after the combination of the MSB and MSB-1 of the page address data set in the page address register BASSAGE according to the accompaniment pattern is automatically set, the performer can arbitrarily change the combination. You can

Succeedingly, in a step S903, the MSB and MSB-1 of the page address data set in the page address register BASSPAGE as described above.
Is set in the bass sound conversion control register BASSCONV.

Based on the contents of the bass sound conversion control register BASSCONV set as described above, FIG.
The bass rewriting control processing of steps S928 to S933 is performed.

First, in step S228, the content of the bass sound conversion control register BASSCONV is determined.
When the content of the bass sound conversion control register BASSCONV is "00" or "01", rewriting control of the bass sound is not performed, and therefore, as in the case of step S227 of FIG. 2 in the first embodiment, step S227. At the pitch data register BA so that the pitch of the bass tone based on the chord C becomes the pitch corresponding to the designated chord type by using the constituent tone conversion table in the ROM 102.
The 4-bit data indicating the pitch of the bass sound in the SSON is converted. Then, in step S934, based on the pitch, the sound source unit 107 in FIG. 1 is instructed to start sounding the bass sound.

Bass sound conversion control register BASSCON
When the content of V is "10", the rewriting control of the bass sound is performed as in the first embodiment, and therefore the determination processing in steps S930 and S931 similar to steps S224 and S225 in the first embodiment is performed. Is executed. As a result, when a new chord is specified at the transition of a bar in the middle of the accompaniment pattern, 4-bit data indicating the pitch of the bass sound in the pitch data register basson is newly specified in step S932. Upper 4 of the register CHORDCODE that stores the pitch of the root note of the chord
It is forcibly replaced by the data in the CCH area of the bit.

Bass sound conversion control register BASSCON
When the content of V is "11", the rewriting control of the bass sound is performed similarly to the second embodiment, and thus the step S92 similar to the step S715 of FIG. 7 in the second embodiment.
The process of 9 is performed.

As a result, regardless of whether the designated code matches the previous code, the register CHORDC
The pitch of the root note of the chord newly specified this time, which is stored in the CCH area of the upper 4 bits of ODE, is stored in the register R.
If it is equal to the pitch of the root note of the previous chord stored in the upper 4-bit area of EGCHORD, the determination in step S929 becomes NO, and steps S930 and S9 are performed.
Since the judgment of 31 is not executed, the pitch of the bass note cannot be rewritten to the pitch of the root note of the designated chord.

If the determination in step S929 is yes, steps S224 and S22 in the first embodiment.
The determination processing of steps S930 and S931 similar to step 5 is executed. <Operation of Fourth Embodiment> In the first to third embodiments described so far, the pitch at which the bass tone is replaced is always one of the lowest octaves that can be produced by the musical instrument (in the case of the embodiment, , C2 to B2) are produced, which is not preferable in terms of music because the pitch of the bass tone is too low.

Therefore, in the fourth embodiment, the pitch data register BEFON for storing the previous pitch data is used, and the pitch of the octave sound closest to the previous pitch indicated by this is the pitch data. It is set to the register BUSSON.

First, the basic operation flowchart is as follows.
2 and 3 according to the first embodiment, operation flowcharts,
An operation flowchart of FIGS. 7 and 8 according to the second embodiment,
Alternatively, either of the operation flowcharts of FIGS. 9 and 10 according to the third embodiment may be used.

In the fourth embodiment, in any one of the operation flowcharts described above, only the part relating to the rewriting process of the bass sound is changed, and steps S226 and 7 in FIG.
Instead of step S726 of FIG. 10 or step S932 of FIG. 10, the processing of steps S1201 to S1206 of FIG. 12 is executed.

In FIG. 12, first, step S120.
In 1, the value of the previous pitch data register BEFON and the register CHORDCO indicating the pitch of the root note specified this time.
Absolute value ND of the difference in the value of the CCH area of the upper 4 bits of DE
1, the absolute value N of the result of subtracting the value “12” from the above difference
D2 and the absolute value ND3 as a result of subtracting the value "24" from the above difference are calculated.

Next, in step S1202, ND1 is set to N.
It is determined whether or not it is larger than D2, and if the determination is NO, in step S1206, the pitch data register BA
The 4-bit data indicating the pitch of the bass note in the SSON is the CC of the upper 4-bits of the register CHORDCODE in which the pitch of the root note of the newly specified chord is stored.
It is replaced by the data in the H area.

If the determination in step S1202 is yes, it is determined in step S1203 whether ND3 is greater than ND2. The determination in step S1203 is Y
In the case of ES, 4-bit data indicating the pitch of the bass sound in the pitch data register BASSON is stored in the register C in which the pitch of the root note of the newly designated chord is stored.
A value obtained by adding a pitch value for one octave to the data of the upper 4-bit CCH area of HORDCODE CCH + 12
Replaced by

If the determination in step S1203 is NO, the 4-bit data indicating the pitch of the bass sound in the pitch data register BASSON stores the pitch of the root note of the newly specified chord. Register CHORDCO
It is replaced by the value CCH + 24 obtained by adding the pitch value of 2 octaves to the data of the CCH area of the upper 4 bits of DE.

The above octave replacement operation will be described using a specific example. For example, as shown in FIG. 13, the pitch (key number) previously set in the pitch data register BEFON is set to 48 (C3 note), and the pitch CCH of the root note of the chord G designated this time is 43 and respectively. 31, and 19
In the case of, the octave tone closest to the C3 tone of BEFON is determined as follows.

First, in the case of CCH = 43, ND1,
ND2 and ND3 are as follows, respectively. ND1 = | BEFON-CCH | = | 48-43 | = 5 ND2 = | BEFON-CCH-12 | = | 48-43-12 | = 7 ND3 = | BEFON-CCH-24 | = | 48-43-24 | = 19 In this case, since ND1> ND2 is not satisfied, step S1
206 is executed, and basson = CCH = 43.

Next, when CCH = 31, ND1,
ND2 and ND3 are as follows, respectively. ND1 = | BEFON-CCH | = | 48-31 | = 17 ND2 = | BEFON-CCH-12 | = | 48-31-12 | = 5 ND3 = | BEFON-CCH-24 | = | 48-31-24 | = 7 In this case, ND1> ND2 and ND3> ND
2, so step S1205 is executed and BAS
SON = CCH + 12 = 43.

Finally, if CCH = 19, ND
1, ND2, and ND3 are as follows, respectively. ND1 = | BEFON-CCH | = | 48-19 | = 29 ND2 = | BEFON-CCH-12 | = | 48-19-12 | = 17 ND3 = | BEFON-CCH-24 | = | 48-19-24 | = 5 In this case, ND1> ND2 and ND3> ND
Since it is not 2, step S1204 is executed and BAS
SON = CCH + 24 = 43.

As described above, when the pitch CCH of the root note of the chord G designated this time is 43, 31, and 19, the pitch difference from the previous bass note C3 (BEFON = 48) is obtained. Is the smallest G2 sound (basson = 43)
Is the bass sound of this time.

In this way, the pitch of the octave tone closest to the pitch of the previous bass tone is determined by using the previous pitch data register BEFON.
Is set for. As a result, the automatic accompaniment is performed with the bass sound having a proper pitch difference (pitch) from the previous bass sound. <Operation of Fifth Embodiment> In the first embodiment, when a new chord is specified at the beginning of a bar, the bass note is rewritten as the root note of the chord. However, depending on the tune or accompaniment pattern, it may be preferable to unconditionally rewrite the bass note to the root note of the chord when a new chord is designated, not limited to the beginning of the bar. The fifth embodiment realizes such control.

14 and 15 are operation flow charts of the fifth embodiment, and steps S1401 to S1423.
2 is the same process as steps S201 to S223 in FIG. 2, and steps S1424 to S1437 are the same processes as steps S225 to S228 in FIG. In the fifth embodiment, step S224 of FIG. 2 in the first embodiment.
The process corresponding to is not executed.

That is, in the first embodiment, before it is determined in step S225 in FIG. 2 whether a new chord is designated, the chord is designated at the head of the bar in step S224. It has been determined whether or not
In the fifth embodiment, if it is determined in step S1424 that a new chord has been designated, regardless of whether or not a new chord was designated at the beginning of the measure, in step S1425 the pitch data is output. Register BAS
4-bit data indicating the pitch of the bass tone in the SON
It is forcibly replaced by the data of the upper 4 bits of the CCH area of the register CHORDCODE in which the pitch of the root note of the newly designated chord is stored.

When the chord is designated in this way, the bass note at that time is unconditionally changed to the root note of the designated chord. <Operation of Sixth Embodiment> Usually, at the beginning of the accompaniment pattern, the bass sound often takes the root sound of the designated chord. However, in order to produce a special effect, a sound other than the root sound may be dared to be used as the bass sound. In such a case, it is better not to rewrite the bass sound even if the chord is specified. The sixth embodiment realizes such control.

16 and 17 are operation flow charts of the sixth embodiment, and step S1 of FIGS.
601 to S1623 and S1625 to S1638 are the first
2 and 3 in the embodiment of FIG.
225 to S238, and only step S1624 in FIG. 16 is different from step S224 in FIG.

That is, in step S1624 of FIG.
By determining whether or not the value of the relative address register BASSADR that determines the read address of the bass pattern is 0002H, it is determined whether or not the current process is a process for the first bass sound of the bass pattern. . That is, since the bass pattern starts from the relative address 0000H as shown in FIG. 6, if the current processing is for the head bass sound of the bass pattern, as a result of the increment processing in steps S1620 and S1622, At the time when step S1624 is executed, the relative address register BASSAD
The value of R becomes 2, and the determination in step S1624 is YES.
Should be

Therefore, the determination in step S1624 is YE.
In the case of S, the pitch of the bass tone is not forcibly replaced, and step S1627 is executed. Step S1
If the determination in 624 is NO, that is, if it is determined that the current process is a process for a bass sound other than the beginning of the bass pattern, the value of the chord change flag CCFLAG is set to "1" in the next step S1625. ", That is, whether or not a new code is designated.

If the determination in step S1625 is also YES, it means that a new chord is specified at a timing other than the timing at which the first bass tone of the bass pattern is sounded. In this case, in step S1626, the 4-bit data indicating the pitch of the bass note in the pitch data register BASSON is stored in the upper part of the register CHORDCODE in which the pitch of the root note of the newly designated chord is stored. It is forcibly replaced by 4-bit CCH area data.

As described above, in order to express a special effect as an accompaniment sound, when a chord is designated at the timing at which the head bass sound of the bass pattern is sounded, the datum other than the root note of the chord is dared. The sound can be the bass sound. <Description of Other Embodiments> Although the respective operations of the first to sixth embodiments have been described above, the present invention further includes
It is also possible to have a means for executing these embodiments by switching them arbitrarily.

[0123]

According to the first or second aspect of the present invention,
When the performer specifies a new chord at the beginning of the measure or at an arbitrary position, the bass note can be rewritten to the root note of the specified chord. As a result, it is possible to obtain a beautiful accompaniment sound that matches the melody.

According to the third aspect of the present invention, when the bass note is rewritten into the root note of the designated chord, the pitch of the root note or a pitch having an octave relationship with the pitch is associated with the root note. Therefore, since the pitch is replaced with the pitch closest to the pitch of the automatic accompaniment sound generated based on the preceding accompaniment pattern data, it is possible to perform a balanced automatic accompaniment.

According to the fourth aspect of the present invention, when the root note of the previously specified chord and the root note of the newly specified chord are the same, the bass note is the root note of the specified chord. Since it is not replaced with, it becomes possible to meet the musical demand that it is better not to have the same root note as the bass note when a chord such as the chord C → C7 is specified.

According to the fifth aspect of the present invention, when a new chord is designated at the timing of the beginning of the accompaniment pattern, the base note is dared to be replaced with the root note of the designated chord. By not having it, it becomes possible to produce a special effect as an accompaniment sound.

According to a sixth aspect of the present invention, the above-mentioned first aspect
It is possible to automatically determine various bass tone replacement operations shown in the fifth to fifth modes in accordance with the accompaniment pattern selected by the performer.

According to a seventh aspect of the present invention, the above-mentioned first aspect
It is possible for the performer to arbitrarily specify various bass sound replacement operations shown in the fifth to fifth modes. Also,
It is possible for the performer to arbitrarily change the automatic setting of the replacement operation of the bass sound according to the accompaniment pattern shown in the sixth aspect.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram common to first to sixth embodiments of the present invention.

FIG. 2 is an operation flowchart of the first embodiment (part 1).
Is.

FIG. 3 is an operation flowchart (No. 2) of the first embodiment.
Is.

FIG. 4 is a diagram (1) showing the contents of each register.

FIG. 5 is a diagram showing the contents of each register (No. 2).

FIG. 6 is a diagram showing the contents of a base pattern ROM.

FIG. 7 is an operation flowchart of the second embodiment (part 1).
Is.

FIG. 8 is an operation flowchart of the second embodiment (part 2).
Is.

FIG. 9 is an operation flowchart (part 1) of the third embodiment.
Is.

FIG. 10 is an operation flowchart (No. 2) of the third embodiment.

FIG. 11 is a diagram for explaining the meaning of combinations of MSBs and MSB-1s of page addresses set in a page address register BASSPAGE.

FIG. 12 is an operation flowchart of octave rewriting processing of a bass sound in the fourth embodiment.

FIG. 13 is a diagram showing a specific example of octave rewriting of a bass sound in the fourth embodiment.

FIG. 14 is an operation flowchart (No. 1) of the fifth embodiment.

FIG. 15 is an operational flowchart (No. 2) of the fifth embodiment.

FIG. 16 is an operational flowchart (No. 1) of the sixth embodiment.

FIG. 17 is an operation flowchart (No. 2) of the sixth embodiment.

FIG. 18 is a diagram showing a musical score (No. 1).

FIG. 19 is a diagram showing a musical score (No. 2).

FIG. 20 is a diagram showing a musical score (No. 3).

FIG. 21 is a diagram showing a musical score (No. 4).

FIG. 22 is a diagram showing a musical score (No. 5).

[Explanation of symbols]

 101 keyboard 102 ROM 103 RAM 104 CPU 105 switch section 106 timer 107 sound source section 108 D / A converter 109 amplifier 110 speaker 111 accompaniment pattern ROM

Claims (7)

[Claims] 1. A series of accompaniment pattern data constituting an accompaniment pattern is sequentially and repeatedly read from the accompaniment pattern data storage means, and the read accompaniment pattern data is sequentially converted based on chord information sequentially specified by the performer. Thus, in the automatic accompaniment device that sequentially emits automatic accompaniment tones, in the accompaniment pattern, the bar head identification means for identifying the accompaniment pattern data at the head timing of the bar, and the accompaniment pattern read from the accompaniment pattern data storage means Accompaniment pattern data normalization means for normalizing the pitch of the bass note of the data so that the pitch becomes the pitch corresponding to the chord information most recently designated by the performer; and the accompaniment pattern data Of the bar read out from the storage means and identified by the bar head identification means When the performer newly specifies the chord information for the accompaniment pattern data at the beginning timing,
Accompaniment pattern data replacement means for replacing the pitch of the bass note of the read accompaniment pattern data with the pitch of the root note corresponding to the newly specified chord information, the accompaniment pattern data normalization means, or An automatic accompaniment sound generation unit that generates the automatic accompaniment sound based on the accompaniment pattern data output from the accompaniment pattern data replacement unit. 2. A series of accompaniment pattern data that constitutes an accompaniment pattern is sequentially and repeatedly read from the accompaniment pattern data storage means, and the read accompaniment pattern data is sequentially converted based on chord information sequentially specified by the performer. As a result, in the automatic accompaniment device for sequentially producing the automatic accompaniment tones, the pitch of the bass tone of the accompaniment pattern data read from the accompaniment pattern data storage unit is most recently designated by the performer. Accompaniment pattern data normalizing means for normalizing to a pitch corresponding to the chord information, and new designation of the chord information by the performer with respect to the accompaniment pattern data read from the accompaniment pattern data storage means. The pitch of the bass note of the read accompaniment pattern data is Based on the accompaniment pattern data output from the accompaniment pattern data normalizing means or the accompaniment pattern data replacement means for replacing the pitch of the root note corresponding to the newly specified chord information And an automatic accompaniment sound generating means for generating the automatic accompaniment sound. 3. The accompaniment pattern data replacement means,
The pitch of the bass note of the accompaniment pattern data read from the accompaniment pattern data storage means is a pitch of the root note corresponding to the chord information newly designated by the performer or an octave with respect to the pitch. Based on the accompaniment pattern data read from the accompaniment pattern data storage unit one before the accompaniment pattern data currently read from the accompaniment pattern data storage unit, the automatic accompaniment sound 3. The automatic accompaniment apparatus according to claim 1, wherein the automatic accompaniment sound generated by the generation means is replaced with a pitch that is closest to the pitch of the automatic accompaniment sound. 4. The accompaniment pattern data replacement means,
The pitch of the root note corresponding to the chord information newly designated by the performer is read from the accompaniment pattern data storage unit one before the accompaniment pattern data currently read from the accompaniment pattern data storage unit. If the pitch of the root note corresponding to the chord information most recently designated by the performer for the issued accompaniment pattern data is the same, the accompaniment read from the accompaniment pattern data storage means. The automatic accompaniment apparatus according to any one of claims 1 to 3, wherein the pitch of the bass tone of the pattern data is not changed. 5. The accompaniment pattern head identification means for identifying the accompaniment pattern data at the head of the accompaniment pattern, wherein the accompaniment pattern data replacement means is read from the accompaniment pattern data storage means, and the accompaniment pattern head. When the performer newly specifies the chord information with respect to the accompaniment pattern data at the head timing of the accompaniment pattern identified by the identification means, the chord information is read from the accompaniment pattern data storage means. The automatic accompaniment apparatus according to any one of claims 1 to 4, wherein the pitch of the bass tone of the accompaniment pattern data is not changed. 6. The accompaniment pattern data replacement operation determining means for determining the operation of the accompaniment pattern data replacement means according to the accompaniment pattern selected by the performer. 5. The automatic accompaniment apparatus according to any one of 5 above. 7. The accompaniment pattern data replacement operation specifying unit for causing the performer to specify the operation of the accompaniment pattern data replacement unit, according to any one of claims 1 to 6. Automatic accompaniment device.