JP2611467B2 - Electronic keyboard instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention detects a chord to which pitch information has been input from the outside, and thereby automatically accompaniment without reducing the number of keys on a keyboard that can be used for normal performance. The present invention relates to an electronic keyboard instrument to which a character can be added.

[Prior Art] Conventionally, an electronic keyboard instrument having a so-called automatic accompaniment function has been known. In this case, a predetermined range of the keyboard is determined in advance as a range of a key for accompaniment, and when an automatic accompaniment is added, a key depression of one or a plurality of keys on the keyboard for accompaniment is detected, and the state of the key depression is determined. , And generates an automatic accompaniment sound composed of a base sound, a card sound and the like based on a designated rhythm (automatic accompaniment pattern).

A portion of the keyboard other than the range for accompaniment can be used as a melody keyboard. When a key is pressed within the range of the melody keyboard, a musical tone (keyboard sound) corresponding to the pressed key is generated. In this way,
The performer can perform automatic accompaniment by pressing a few keys on the keyboard for accompaniment, and generating a melody sound corresponding to the key pressed on the melody keyboard. .

[Problems to be Solved by the Invention] Usually, a key range of one octave or more is assigned for automatic accompaniment, and key depression is detected within that range. Therefore, when performing a performance while giving an automatic accompaniment, a key range other than the automatic performance (a key range for a melody) is narrowed, and there is a disadvantage that a satisfactory performance cannot be performed.

SUMMARY OF THE INVENTION The present invention provides an electronic keyboard instrument that can add an automatic accompaniment without reducing the number of keys on a keyboard that can be used in a normal performance without an automatic accompaniment. The purpose is to:

[Means for Solving the Problems] In order to achieve this object, the present invention has a keyboard having a plurality of keys for inputting pitch information, and a plurality of musical tones are simultaneously produced by pressing each key. In an electronic keyboard musical instrument capable of generating, a mode switching means for selectively switching between a first mode and a second mode in accordance with an external signal, and an external input means for externally inputting pitch information. If the first mode is selected by the mode switching means, a chord is detected based on pitch information input from a predetermined range of the keyboard, and the second mode is switched by the mode switching means. If selected, a chord detecting means for detecting a chord based on the pitch information input by the external input means, an automatic accompaniment pattern generating means for generating an automatic accompaniment pattern, A musical tone generating means for generating an automatic accompaniment musical tone based on the chord detected by the chord detecting means and the automatic accompaniment pattern generated by the automatic accompaniment pattern generating means.

[Operation] According to such a configuration, the mode switching means selectively switches between the first mode and the second mode according to an external signal. The chord detecting means detects a chord based on pitch information input from a predetermined key range of the keyboard in the first mode, and a chord based on pitch information input from the outside in the second mode. Is detected. The automatic accompaniment pattern generating means generates a pattern for automatic accompaniment. Then, based on the chord detected by the chord detecting means and the pattern of the automatic accompaniment generated by the automatic accompaniment pattern generating means, the musical sound generating means generates a musical tone of the automatic accompaniment. On the other hand, in the first mode, the player can depress a chord for an automatic accompaniment in the predetermined key range, and can perform a normal performance in other key ranges. , A corresponding tone is generated. In the second mode, the player can perform using all keys on the keyboard, and a corresponding tone is generated in response to the key depression.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an electronic keyboard instrument according to an embodiment of the present invention. In this figure, reference numeral 11 denotes a central processing unit (CP) for controlling the entire operation of the electronic keyboard instrument.
U) and 12 are tempo clock generators for performing timer interrupts to the CPU 11, 13 is a random access memory (RAM) used for work registers or flags, and 14 is a CPU
11 is a read-only memory (ROM) that stores programs to be executed, 15 is a pattern memory that stores automatic accompaniment patterns, 16 is a keyboard, 17 is a mode switch,
18 is other switch except mode switch, 19 is MIDI
A MIDI interface that accepts the input of the system, 20 is a musical tone forming means (sound source), and 21 is a sound system. Each of these blocks is connected to a bidirectional bus line 22.

Next, a register or a flag used in the electronic keyboard instrument of this embodiment will be described.

(1) MODE: Mode register. Normal mode with “0”,
“1” indicates the accompaniment key automatic performance mode (key ABC (auto bass chord) mode), and “2” indicates the MIDI automatic performance mode (MIDI
ABC mode).

(2) KCD: Key code register for storing a key code.
A sound channel is provided for each sound channel.
The key code register of the channel is represented by KCDi.

(3) ROOT: A root register for storing the root of the detected chord.

(4) TYPE: Chord type register for storing the chord type of the detected chord.

(5) KON: A key-on flag that is set to "1" when a keyboard key is turned on and reset to "0" when the key is turned off.

Next, the operation of the electronic keyboard instrument according to this embodiment will be described with reference to the flowchart of FIG. When processing is started in this electronic keyboard instrument, first, initialization is performed in step S11, key depression processing is performed in step S12, MIDI processing is performed in step S13, mode switch processing is performed in step S14, and other processing is performed in step S15. Is performed, and the process returns to step S12. The above loop processing is repeated.

The mode switch processing routine in step S14 in FIG. 2 will be described with reference to FIG.

In the mode switch processing routine, step S2
At step 1, it is determined whether or not the key ABC switch of the mode switch 17 has been turned on. If the key ABC switch is turned on in step S21, the accompaniment key automatic performance mode (key AB
C mode), set the mode register in step S22.
“1” is stored in MODE, and the process proceeds to step S23. Step S
If there is no key ABC switch ON event at 21, the process proceeds directly to the switch S23.

In step S23, it is determined whether or not the MIDI / ABC switch among the mode switches 17 has been turned on. If the MIDI / ABC switch is on, "2" is stored in the mode register MODE in step S24 to set the MIDI automatic performance mode (MIDI / ABC mode) in which automatic performance is performed based on external input. Thereafter, the process proceeds to step S25. Step S23
If the MIDI / ABC switch is not on, the process proceeds directly to step S25.

In step S25, it is determined whether or not the normal switch among the mode switches 17 is turned on. If the normal switch is on, the mode register MODE is set in step S26 to set the normal mode in which a musical tone (keyboard sound) corresponding to a player's key press is generated without performing automatic accompaniment.
After "0" is stored in, return. If there is no ON event of the normal switch in step S25, the process directly returns.

Through the above processing, the performance mode corresponding to the operation of the mode switch is set in the mode register MODE.

In the electronic keyboard instrument of this embodiment, in addition to the mode switching in accordance with the operation of the mode switch, an external device is used by using a MIDI signal input from the MIDI interface 19.
You can switch between Normal, Key ABC, and MIDI / ABC modes. In the first claim, "first mode" corresponds to a normal mode, and "second mode" corresponds to a MIDI / ABC mode.

Referring to FIG. 4, in the key pressing process in step S12 in FIG. 2, first, in step S31, it is determined whether or not the mode register MODE is "1". If the value is "1", the mode is the accompaniment automatic performance mode, and the process branches to step S41.
If the mode register MODE is not "1" in step S31, it is determined in step S32 whether or not there is a key-on event. If there is a key-on event, the process proceeds to step S33; otherwise, the process branches to step S36.

In step S33, a channel assignment process is performed to generate a tone corresponding to the turned on keyboard key. The assigned channel number is i. Next, step S34
Then, "1" is stored in the key-on flag KONi of the i-channel, and the key code of the key having the ON event is stored in the key code register KCDi. In step S35, note-on and key code KCDi are transmitted to the sound source 20 to generate a musical tone, and the process proceeds to step S36.

In step S36, it is determined whether or not there is a key-off event. If there is no key-off event, the process returns as it is, and if there is, the process proceeds to step S37. Step S37
To search for a channel that is sounding with a key code that matches the key code of the key that had the key-off event. Then, in a step S38, it is determined whether or not there is a corresponding channel. If there is a channel with the corresponding channel number i, the process proceeds to step S39; otherwise, the process returns. In step S39, the key-on flag KONi of the i-channel is cleared to zero, and in step S40, a note-off is sent to the i-channel of the sound source 20 to mute the sound.
To return.

If the mode register MODE is "1" in step S31, it is determined in step S41 whether or not there is a key-on event. If there is a key-on event, the process proceeds to step S42; otherwise, the process returns. Step S4
In step 2, the key range of the key having the ON event is determined. If the key range is the normal range, that is, the range of the melody keyboard, it is necessary to generate a musical tone corresponding to the key depression, and the process branches to step S33 to generate a corresponding keyboard sound.

If the key range of the key having the key-on event in step S42 is the ABC range, that is, the range of the keyboard for accompaniment, a chord is detected from the combination of key presses in step S43, the root note is stored in the register ROOT, and the chord of the chord is detected. The type is stored in the register TYPE, respectively, and the process returns.

As described above, in the normal mode or the MIDI automatic performance mode, a musical tone (keyboard sound) corresponding to a key depression is generated in the range of all keys. On the other hand, in the accompaniment key automatic performance mode, a sound corresponding to the automatic accompaniment or the key depression is produced corresponding to the key range of the key depression.

Referring to FIG. 5, in the MIDI processing in step S13 in FIG. 2, first, in step S51, it is determined whether or not the mode register MODE is "2". When the mode register MODE is "2", the MIDI automatic performance mode is selected.
At step S52, pitch information is input from the outside by MIDI input, a chord is detected from the combination of the key codes, and the root note is stored in the register ROOT and the type of the chord is stored in the register TYPE. After that, it advances to step S53. If the mode register MODE is not "2" in step S51, the process branches to step S53 because the mode is the normal mode or the accompaniment key automatic performance mode. After performing other MIDI processing in step S53, the process returns.

Through the above MIDI processing, a chord is detected from an external input in the MIDI automatic performance mode, and its root and chord type are stored in a predetermined register.

With reference to FIG. 6, a description will be given of a tempo clock interrupt processing routine in the electronic keyboard instrument of this embodiment. The tempo clock interrupt processing routine is a process executed by the CPU 11 based on an interrupt signal generated from the tempo clock generator 12 at predetermined time intervals.

In the tempo clock interrupt processing, first step
In S61, it is determined whether or not the mode register MODE is "0". When the mode MODE is "0", the mode is the normal mode, and therefore, the process returns. If the mode MODE is other than "0", the mode is the accompaniment key automatic performance mode or the MIDI automatic performance mode, so in step S62 a pattern corresponding to the rhythm type is selected and data to be generated is read out based on the value of the tempo clock. .

Next, in step S63, it is determined whether there is control data to be sounded. If there is data to pronounce, step S6
Proceed to 4, and if not, branch to step S67. In step S64, the read control data is corrected based on the chord type TYPE, and a root note ROOT is added to the corrected control data to generate note data to be generated. Then, in step S65, octave information of a sound range to be sounded is given, and in step S66, the data thus processed is transmitted to the sound source 20 to generate a musical tone. Then, in step S67, the tempo clock is advanced, and the process returns.

By the tempo clock interrupt processing as described above, a musical tone of the automatic performance in the accompaniment automatic performance mode or the MIDI automatic performance mode is generated.

Note that input of pitch information from the outside is, for example,
Any device that can generate pitch information, such as a keyboard or a sequencer, may be used. If the present invention is applied to an electronic musical instrument system for training in which a plurality of electronic musical instruments as child devices are connected to one electronic musical instrument as a parent device, pitch information for automatic accompaniment is transmitted from the parent device. A key press performance can be performed in each of the slave units while the automatic performance is added to each slave unit.

In the above-described embodiment, the input of the pitch information is based on the input of the MIDI method. However, the input is not limited to this, and other transmission methods can be used. Further, in the above-described embodiment, an example of the auto bass chord for providing the bass sound and the chord sound has been described. Also, the control can be performed using hardware instead of software.

[Effects of the Invention] As described above, according to the present invention, an external accompaniment is performed by detecting a chord by inputting external pitch information such as MIDI, and further, in accordance with an external signal. Since the mode of automatic accompaniment is determined according to the mode by switching the mode, it is possible to easily change the mode of automatic accompaniment from an external device and to respond to key depression. It is possible to perform in a wide range of keys while adding automatic accompaniment without reducing the number of keys on the keyboard capable of generating musical tones.

[Brief description of the drawings]

FIG. 1 is a block diagram of an electronic keyboard instrument according to an embodiment of the present invention. FIG. 2 is a flowchart for explaining the operation of a main routine of the electronic keyboard instrument of this embodiment. FIG. 4 is a flowchart for explaining an operation of a mode switch processing routine of the electronic keyboard instrument of this embodiment. FIG. 4 is a flowchart for explaining an operation of a key pressing processing routine of the electronic keyboard instrument of this embodiment. Is a flowchart for explaining the operation of the MIDI processing routine of the electronic keyboard instrument of this embodiment. FIG. 6 is a flowchart for explaining the operation of the tempo clock interruption processing routine of the electronic keyboard instrument of the embodiment. . 11: CPU, 12: Tempo clock generator, 13: RAM, 14: ROM, 1
5: Pattern memory, 16: Keyboard, 17: Mode switch, 18:
Other switches, 19: MIDI interface, 20: musical tone formation means, 21: sound system.

Claims (1)

(57) [Claims] An electronic keyboard musical instrument having a keyboard provided with a plurality of keys for inputting pitch information and capable of simultaneously generating a plurality of musical tones by depressing each key. Mode switching means for selectively switching between the first mode and the second mode in response thereto, external input means for inputting pitch information from outside, and the first mode is selected by the mode switching means. If the second mode is selected by the mode switching means, a chord is detected based on pitch information input from a predetermined key range of the keyboard. A chord detecting means for detecting a chord based on the pitch information, an automatic accompaniment pattern generating means for generating an automatic accompaniment pattern, a chord detected by the chord detecting means, Based on the automatic accompaniment pattern generated by the accompaniment pattern generating means, the electronic keyboard instrument, characterized by comprising a tone generating means for generating a music of automatic accompaniment.