JPH0734156B2 - Musical tone control mechanism for electronic musical instruments - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electronic musical instrument, and more particularly to a musical tone control mechanism for adjusting volume and the like during performance.

[Prior Art] Various electronic musical instruments have been developed, which are equipped with a sound source oscillator, an acoustic waveform shaper, an amplifier, a speaker, and various electronic control circuits, and generate electronic sounds by operating various buttons on a keyboard and an operation board. . In such an electronic musical instrument, it is necessary to adjust the musical tone such as the tone color, pitch, and volume of the generated electronic sound, and such musical tone adjustment can be adjusted corresponding to the keyboard area such as the melody part and the accompaniment part. desirable.

As a musical tone control mechanism for conventional electronic musical instruments, an electronic musical instrument equipped with a rotary volume control device along the keyboard has been used
It is disclosed in the publication. In this conventional electronic musical instrument, one cylindrical volume controller slightly longer than the length of the keyboard is provided along the keyboard, and by rotating this volume controller by hand, the volume can be adjusted with the same hand while operating the keyboard. Is configured as follows.

[Problems to be Solved by the Invention] In the above-described conventional electronic musical instrument, since one columnar volume control body is provided over the entire keyboard, for example, a portion where musical tone adjustment is unnecessary is performed in the keyboard solo area or the like. There was a case where the hand pressing the keyboard accidentally touched the rotating body and operated the rotating body by mistake.

The present invention has been made in view of the above-mentioned drawbacks of the prior art. In a musical tone control mechanism having a musical tone adjusting rotator on the keyboard front side, a musical tone control mechanism of an electronic musical instrument capable of preventing erroneous operation of the rotator. For the purpose of providing.

[Means for Solving the Problems] In order to achieve the above object, in the electronic musical instrument according to the present invention, a rotating body for musical tone adjustment operation having a rotation axis along the keyboard arrangement direction is provided on the front side of the keyboard, The operation position of the rotating body is variable along the keyboard arrangement direction.

[Operation] The front side of the keyboard portion that does not require tone adjustment is removed from the rotary operation position of the rotor, and the tone adjusting rotor is not rotated by the hand pressing the keyboard in this portion.

[Embodiment] FIG. 1 is a top view of an embodiment of an electronic musical instrument according to the present invention. The musical instrument body 5 comprises an operation board section 1 and a keyboard 2, and various operation buttons 10 are provided on the operation board section 1 and the keyboard 2 is provided on the front side thereof. On the front side of the keyboard 2, a tone control wheel (roll bar) 3 which is a cylindrical rotating body having a rotation axis along the keyboard 2 is provided. The roll bar 3 is for adjusting musical tones such as tone color, pitch and volume. The selection of the tone control function of the roll bar 3 is performed by selecting and pressing the selection button 4 on the operation board 1, whereby the desired tone control can be performed.

A cover 23 is provided on the roll bar 3 of the musical tone adjustment unnecessary portion of the keyboard 2, that is, the accompaniment portion on the left side in this example, and the roll bar 3 of this portion is covered so that the rotation operation cannot be performed. The cover 23 may have a cylindrical shape that covers the entire outer circumference of the roll bar 3, or may have a configuration that covers only the front surface and the upper surface of the roll bar exposed from the instrument body. The cover 23 may be configured to be movable along the keyboard so that the roll bar 3 corresponding to a desired keyboard portion cannot be rotated. Alternatively, several kinds of covers 23 having different lengths may be prepared in advance, and a cover having an appropriate length may be selected and mounted as needed.

When playing such an electronic musical instrument, as shown in FIG. 2, the hand playing the left keyboard portion does not touch the roll bar 3 by the cover 23, and therefore the roll bar 3 is pressed by the hand pressing the keyboard portion. There is no chance that 3 will be misoperated.

FIG. 3 shows another example of a mechanism for changing the rotational operation position of the musical tone adjusting roll bar 3. In this example, the roll bar 3 is telescopically configured to be expandable and contractable as shown by arrow A. The number of expansion / contraction steps is not limited to two, and may be three or more. The roll bar is not provided in the portion corresponding to the keyboard of the tone adjustment unnecessary portion (the keyboard on the right side in this embodiment), and therefore, the rotation operation of the roll bar 3 cannot be performed by the hand pressing the keyboard of this portion. .

FIG. 4 shows still another example of the mechanism for changing the rotational operation position of the musical tone adjusting roll bar 3. In this example, the length of the roll bar 3 itself is shortened, and the roll bar 3 is mounted on the rotary shaft 24 so as to be slidable and capable of transmitting rotation by a spline structure or the like. By sliding the roll bar 3 on the rotary shaft 24 as shown by an arrow B and arranging the roll bar 3 at a desired position, it is possible to adjust the rotation of the musical sound only in an area corresponding to a desired keyboard portion.

The change characteristics such as the tone color, the volume, and the pitch with respect to the rotation amount of the roll bar 3 and the changing direction such as the increasing direction or the decreasing direction are the switches on the operation board connected to the control electronic circuit.
It can be adjustable by 10 operations.

The function selection button 4 of the roll bar 3 is composed of, for example, 6-side buttons, and is used to adjust the solo volume, orchestra volume, accompaniment volume, modulation control, tone color control, and total volume, respectively.
Explaining these button functions, the solo volume controls the volume of a single note such as a melody performance, the orchestra volume controls the volume of chords, accompaniment and other non-solo sounds,
The accompaniment volume controls the volume of the rhythm sound, the modulation control adjusts the transposition, the tone color control adjusts the tone quality of each sound, and the total volume controls the volume of the total sound of solo, orchestra, and accompaniment. It is a thing.

FIG. 5 is a sectional view of the electronic musical instrument having the above configuration. The roll bar 3 is arranged with the side surface and the upper surface on the front side of the frame 11 of the musical instrument body 5 exposed. A rotary volume 6 is attached to the end of the roll bar 3. The rotary volume 6 is rotated by the rotation of the roll bar 3, and an electronic circuit (not shown) is generated based on the resistance change according to the rotation amount.
Control the musical sound through. The rotation detection of the roll bar 3 is not limited to the rotary volume, and it is possible to detect a change in the amount of light using a photo resistor, a change in the magnetic field, or any other suitable means.

FIG. 6 shows another arrangement row of the musical sound adjusting operation roll bar 3. In this example, the roll bar 3 is the instrument body 5
Only the front side surface of the frame 11 is exposed.
Other configurations and operations are similar to those of the example shown in FIG.

FIG. 7 is a schematic block diagram of basic hardware of an electronic musical instrument according to the present invention. The operation of this electronic musical instrument is controlled by a central processing unit (CPU) 12. A keyboard circuit 18 for inputting a pressing signal of each key of the keyboard to the CPU 12 via a bidirectional bus line 17, a switch group for inputting pressing signals of various switches including a roll bar function selection button on an operation board (panel) 19, a roll bar rotation detection circuit 20, an A / D converter 13 connected to it, an electronic sound control tone generator 14, etc. are connected. Tone generator 14
A speaker 16 is connected to the amplifier 16 via an amplifier 15. CP
U12 is a read-only memory (R
OM) and registers for temporarily storing various data for executing this program. The tone generator 14 is provided with a plurality of, for example, eight tone forming channels for forming a key depression sound, and a key depression (key on), a key release (key off), a tone color (or musical instrument type) and a tone given by the CPU 12 for each channel. A tone signal is formed on the basis of data such as high (key name) to form an electronic tone, which is then amplified 15
And the sound is output to the outside through the speaker 16.

FIG. 8 is a schematic flowchart showing the main flow of the basic operation of the roll bar for tone control operation of the present invention based on the hardware of FIG. Step a is a key scanning operation by the keyboard operation, and the generated sound is controlled via the tone generator 14 based on the signal input from the keyboard circuit 18 corresponding to each pressed key. Step b is CP
Operation board (panel) via switch group 19 by U12
This is a panel switch scan operation for scanning the pressing of each switch button above, and includes the above-described roll bar function selection button scan operation. Step c is an operation of inputting a tone color parameter and the like to the tone generator 14 in response to each button operation of the panel switch, and includes an operation of writing the target specific number of the selected roll bar function to the CPU 12. Step d is a tone control operation by the roll bar, which controls the tone based on a predetermined selection function written in the CPU 12 according to the rotation of the roll bar.

FIG. 9 shows the data fetching operation by rotating the roll bar. First, in step e, the roll bar rotation amount
AD-converted and taken into CPU12 as digital data. Next, in step f, it is determined whether or not the captured data has changed. If the roll bar is rotating, there is a change, and if it is not rotating, there is no change. If there is no change, the process returns to step a in FIG. 8 and the tone control from the key scan is repeated again. When the roll bar is rotating, based on the target specific number write data of the selected roll bar function (step c in FIG. 8), the input destination of the rotation amount data in step g is, for example, as described above. It is assigned to six functions (numbers 0 to 5). Here, the volume of the solo sound, accompaniment sound, etc. is set in steps h ₀ , h ₁ , ... Based on each selected function according to the amount of rotation of the roll bar. An electronic sound is generated by the above tone control, the process returns to step a in FIG. 8 and the tone control from the key scan is repeated again.

[Effects of the Invention] As described above, according to the present invention, since the operation position of the roll bar for musical sound control arranged along the keyboard has a variable structure, the roll at the position of the keyboard portion where the musical sound needs to be adjusted. It is possible to rotate only the bar, and it is possible to prevent erroneous operation of the roll bar by the hand playing the keyboard of the tone adjustment unnecessary portion.

[Brief description of drawings]

FIG. 1 is a top view of an electronic musical instrument according to the present invention, FIG. 2 is a usage explanatory view of the electronic musical instrument according to the present invention, FIG. 3 is a top view of another example of the electronic musical instrument according to the present invention, and FIG. Is a top view of still another example of the electronic musical instrument according to the present invention, FIG. 5 is a sectional view of the electronic musical instrument according to the present invention, and FIG. 6 is a sectional view of another example of the electronic musical instrument according to the present invention. FIG. 8 is a schematic block diagram of the basic hardware of the electronic musical instrument according to the present invention, FIG. 8 is a flowchart of the basic operation of the electronic musical instrument according to the present invention, and FIG. 9 is a basic operation of the musical tone control mechanism of the electronic musical instrument according to the present invention. It is a flowchart of. 2: Keyboard, 3: Roll bar, 4: Function selection button, 23: Cover.

Claims (1)

[Claims] 1. A rotary body for musical tone adjustment operation having a rotation axis along the keyboard arrangement direction is provided on the front side of the keyboard, and an operation position of the rotary body has a variable structure along the keyboard arrangement direction. Musical tone control mechanism for electronic musical instruments.