JPH08146959A - Automatic accompaniment device - Google Patents

Abstract

PURPOSE: To provide the automatic accompaniment device which plays an accompaniment automatically while generating an optional base sound. CONSTITUTION: With an automatic accompaniment start button 12 pressed, an automatic musical performance is started and automatic accompaniment data stored in a ROM previously are read out in order. Then while the automatic musical performance data are read out, the pitch of a base sound is specified by operating a single key in a chord specification side area A and then when a chord is specified by pressing plural keys, an internal CPU operates to vary the base sound of the sequentially read-out automatic accompaniment data to the specified pitch, thereby altering the pitch of the accompaniment sound to the specified chord.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic accompaniment apparatus capable of arbitrarily changing the pitch of a bass tone that constitutes an accompaniment.

[0002]

2. Description of the Related Art Conventionally, an automatic accompaniment apparatus has stored therein automatic accompaniment data consisting of pronunciation timings of the accompaniment patterns and their pitches. It is stored with the pitch that should be pronounced by. When the performer operates the accompaniment key range to specify a chord other than C major, the pitch of the accompaniment pattern is converted according to the root note and chord type of the specified chord. The root note of the specified chord is determined as the bass note. Therefore, when the performer sequentially designates chords, the pitch of the generated automatic accompaniment changes according to the designated chord, and at the same time, the bass note having the pitch of the root note of the designated chord is generated. Therefore, by performing the melody performance in the melody key area and designating the chord suitable for the melody to be played in the accompaniment key area, the melody and the pitch accompaniment and the bass sound suitable for the melody can be easily selected. You can play the song.

[0003]

However, in such a conventional automatic accompaniment apparatus, when a chord is designated, the pitch of the generated bass tone is uniquely determined by the root note of the designated chord. Will be done. For this reason, it is not possible to perform an automatic accompaniment of a fractional chord whose chord root sound and a bass pitch are different, and the degree of freedom of performance accompanied by automatic accompaniment is limited.

The present invention has been made in view of the above-mentioned problems of the related art, and while generating an arbitrary bass sound,
It is an object of the present invention to provide an automatic accompaniment device capable of performing automatic accompaniment.

[0005]

In order to solve the above-mentioned problems, according to the present invention, an automatic accompaniment data output means for outputting automatic accompaniment data, a keyboard having a plurality of keys, and an operation on this keyboard. A storage means for storing a pitch corresponding to a single key as bass sound data, a chord detection means for detecting chords based on a plurality of keys operated on the keyboard, and an automatic accompaniment data output means. Converting means for converting the pitch of the automatic accompaniment data into a pitch corresponding to the chord detected by the chord detecting means,
It has a musical tone generation instructing means for instructing the generation of an accompaniment sound based on the pitch-converted automatic accompaniment data and the bass sound data stored in the storage means.

[0006]

In the above structure, when a single key is operated on the keyboard, the pitch corresponding to the operated key is stored in the storage means as the bass sound data. When a plurality of keys are operated on the keyboard, the code detecting means detects the code based on the operated plurality of keys. Then, the conversion means converts the pitch indicated by the automatic accompaniment data into a pitch corresponding to the detected chord, and the musical tone generation means converts the converted automatic accompaniment data and the bass tone stored in the storage means. The generation of an accompaniment sound is instructed based on the data. Therefore, by operating a single key on the keyboard to specify the bass sound, and then operating multiple keys to specify the chord, it is possible to generate an accompaniment sound consisting of the specified bass sound and chord. Becomes

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, the present invention is applied to an electronic musical instrument, and as shown in FIG.
A keyboard 11 is provided. A plurality of keys are arranged on the keyboard 11, and each key is provided with a keyboard switch (not shown) which is turned on when a key is pressed.
Further, the electronic musical instrument 11 is provided with an automatic accompaniment start button 12 and an automatic accompaniment stop button 13, and a plurality of accompaniment selection buttons 14. Accompaniment patterns such as rock and waltz are assigned to the accompaniment selection buttons 14, and the keyboard 11 is accompanied by the start of the automatic accompaniment, and the chord designation side A and the treble range lower than the predetermined pitch. The melody playing side B is split.

FIG. 2 is a block diagram showing the circuit configuration of the electronic musical instrument 1, and the above-mentioned keyboard switches and buttons 1 are shown.
The on / off information of 2 to 14 is input to the CPU 5 from the operator 4 such as a keyboard in this block diagram. CPU5
Operates in accordance with the input information, the program stored in the ROM 6, the data stored in the RAM 7, and the like, and controls the tone generating device 8. The musical tone generator 8 generates musical tone waveform data according to the given frequency data, and this musical tone waveform data is converted into an analog musical tone waveform by the D / A converter 9. The converted analog tone waveform is given to the sounding circuit 10 including an amplifier and a speaker and emitted. In addition, the ROM 6 has the accompaniment selection button 14 together with the program.
Automatic accompaniment data is stored for each accompaniment pattern assigned to. The automatic accompaniment data is composed of tone generation timings of musical tones that form the accompaniment and pitch data of each musical tone, and each pitch data is stored with a pitch to be pronounced when the performer specifies C major. Has been done.

Next, the operation of this embodiment having the above configuration will be described with reference to the flow chart. That is, when the power is turned on, the CPU 5 operates according to the main flow shown in FIG. 3, and first executes the initialization process (SA
1). By this initialization processing, the buffers 1 to 3 used for subsequent control are cleared. Next, CPU5
Detects the state of the automatic accompaniment start button 12, determines whether or not it has been pressed (SA2), and maintains the standby state until it is pressed.

If the automatic accompaniment start button is pressed, the automatic accompaniment process (SA3) is started, and along with the start of this automatic accompaniment process, the accompaniment pattern previously selected by the operation of the accompaniment select button 14 is selected. The automatic accompaniment data is sequentially read from the ROM 6. This automatic accompaniment process continues until the automatic accompaniment stop button 13 is pressed (SA
4) If the automatic accompaniment stop button 13 is operated, the automatic accompaniment process is stopped at that point and the process returns to SA2.

During execution of the automatic accompaniment process (SA2), every time a key is pressed in the chord designating side A,
The process according to the flow shown in FIG. 4 is interrupted and executed,
First, it is determined whether or not there is key pressing data capable of detecting a code on the code designating side A (SB1). In other words, even if there is a key press on the chord designating side A, if the key press is a boring command that does not correspond to any code, or if it is a single key press, the code cannot be detected. In these cases, the process proceeds from SB1 to SB2. Then, in SB2, it is judged whether or not the key depression is only one key on the code designating side A, and when it is only one key, the key depression data (key number) is stored in the buffer 1. After (S
B3), and returns to the main flow.

If there is key pressing data for which a code can be detected as a result of the discrimination in SB1, SB1 to SB4
Then, it is judged whether or not the key depression data is stored in the buffer 1. When the key depression data is stored in the buffer 1, the key depression data of the buffer 1 is used as the base event data of the code designating side A, and the buffer 2
(SB5), and then the key depression data in the buffer 1 is cleared (SB6). Therefore, the key depression data in the buffer 1 is erased when it is stored in the buffer 2 as the base event data.

After the processing of SB6, or when there is no key depression data in the buffer 1 as a result of the discrimination of SB4, a plurality of key depression data which can detect the chord are coded. The data is stored in the buffer 2 (SB7). Therefore, when the code designating side A performs a single key depression and then performs a plurality of simultaneous key depressions capable of code detection, the buffer 2 is set to the base when the processing up to SB7 is completed. Event data and code event data are stored. But,
When only a plurality of simultaneous key presses capable of code detection are performed without performing a single key press, only the code event data is stored in the buffer 2.

On the other hand, as described above, in the automatic accompaniment process, the automatic accompaniment data of the preselected accompaniment pattern is sequentially read from the ROM 6, and when the tone generation timing arrives in this automatic accompaniment pattern, an interrupt occurs. When it occurs, the process according to the flow shown in FIG. 5 is executed. That is, the event data stored in the buffer 2 is read (SC1), and the chord type (Major, Minor, 7th, min7th, etc.) and the root sound are determined from the chord event data in the read event data ( SC2).

Next, it is determined whether or not the event data read from the buffer 2 has base event data (SC3). If there is base event data, the base event data is used as the base (SC
4) If not, the root sound determined in SC2 is used as the base (SC5). Then, the type of chord, the root note and the bass are converted into an accompaniment pattern to be played (SC6).

That is, as described above, the automatic accompaniment data stored in the ROM 6 is composed of the sounding timings of the musical tones that make up the accompaniment and the pitch data of each musical tone, and each pitch data is set by the performer. It is stored with the pitch to be pronounced when C major is specified. Therefore, in this SC6, the specific pitch of the automatic performance data read from the ROM 6 is changed by a semitone in accordance with the type of chord indicated by the chord event data, or in accordance with the root note of the chord indicated by the chord event data. , The overall pitch of the automatic performance data is changed up and down, and further, the bass tone is changed to the "bass" pitch by SC4 or SC5. Furthermore, the accompaniment pattern converted in SC6,
That is, the constituent sounds of the accompaniment are converted into note data and stored in the buffer 3.

Then, in the tone generation interrupt processing of FIG. 6 which is executed subsequent to the interrupt processing shown in FIG.
The note data is read from the buffer 3 (SD
1). Subsequently, the note data is converted to frequency data (SD2), and the converted frequency data is sent to the musical sound generating device 8 at a designated time, that is, in synchronization with the sounding timing described above. Then, the musical sound generator 8
Generates musical tone waveform data in accordance with the transmitted frequency data, and the musical tone waveform data is generated by the D / A converter 9
Is converted into an analog musical tone waveform by the sound generation circuit 10.

Therefore, by executing the processing shown in each flow above, it is possible to operate without operating a single key.
When a chord is specified by operating a plurality of keys, an accompaniment sound consisting of a bass sound corresponding to the root of the specified chord and a constituent sound corresponding to the specified chord is generated, and at the chord designating side A, When a single key is operated and then multiple keys are operated to specify a chord, an accompaniment sound consisting of a bass sound corresponding to the operated single key and a configuration corresponding to the specified chord is produced. appear. Therefore, code designation side A
By operating a single key to specify the bass tone, it is possible to advance the automatic accompaniment while changing the pitch of the bass tone regardless of the designated chord.

When a key is operated on the melody playing side B, a tone having a pitch corresponding to the depressed key is generated from the sounding circuit 10 by a process according to a flow not shown. Therefore, by performing operations on the chord designating side A and the melody key range B side, it becomes possible to perform a melody performance with accompaniment in which the pitch of the bass tone is freely changed.

[0020]

As described above, according to the present invention, when a single key operation is performed, a pitch corresponding to the key is stored as bass sound data, and then a plurality of keys capable of detecting a chord are operated. In this case, the bass sound data and the accompaniment sound corresponding to the detected chord are generated. Therefore, regardless of the chord designated by the key depression, it is possible to advance the automatic accompaniment while generating an arbitrary bass sound. Therefore, even an accompaniment having a fractional chord whose chord root sound and a bass pitch are different can be automatically accompanied, whereby the flexibility of the performance accompanied by the automatic accompaniment can be expanded.

[Brief description of drawings]

FIG. 1 is an external view of an electronic musical instrument to which an embodiment of the present invention is applied.

FIG. 2 is a block diagram showing a circuit configuration of this embodiment.

FIG. 3 is a flowchart showing a main flow of this embodiment.

FIG. 4 is a flowchart showing an outline of key-depression interrupt processing on the code designation side.

FIG. 5 is a flowchart showing an outline of automatic accompaniment interrupt processing.

FIG. 6 is a flowchart showing an outline of pronunciation interruption processing.

[Explanation of symbols]

 5 CPU 6 ROM 7 RAM 11 keyboard

Claims (2)

[Claims] 1. An automatic accompaniment data output means for outputting automatic accompaniment data, a keyboard having a plurality of keys, and a storage means for storing a pitch corresponding to a single key operated on the keyboard as bass sound data. A chord detecting means for detecting chords based on a plurality of keys operated on the keyboard, and a pitch of the automatic accompaniment data output from the automatic accompaniment data output means to a chord detected by the chord detecting means. A conversion means for converting the pitch into a corresponding pitch; and a tone generation instruction means for instructing generation of an accompaniment sound based on the pitch-converted automatic accompaniment data and the bass sound data stored in the storage means. An automatic accompaniment device characterized by the above. 2. The musical tone generation instruction means, in a state in which the bass sound data is not stored in the storage means, uses the root of the chord detected by the chord detection means as the bass sound data and sets the accompaniment sound. The automatic accompaniment apparatus according to claim 1, wherein generation is instructed.