JPS6022395Y2 - electronic musical instruments - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electronic musical instrument that can also play Arabic scales.

Conventional electronic musical instruments are composed of 12 equal-tempered scales, and cannot perform special scales such as the Arabic scale.

On the other hand, the applicant of the present application is
No. 10 (Japanese Unexamined Patent Publication No. 53-29113), etc., he proposed an electronic musical instrument that was capable of playing such special scales.

As a result, performances using the equal-tempered scale and the Arabic scale became possible.

In addition, performances such as improvising Arabic scales in the middle of a regular performance song to add variety to the song are based on the repertoire.
was able to expand greatly.

However, when such electronic musical instruments are equipped with an automatic rhythm performance device or an automatic accompaniment device, these are unnecessary when playing the Arabic scale, which is mainly played by single notes, and the equal-tempered scale is set to the Arabic scale. When doing so, automatic rhythm playing devices, automatic accompaniment devices, etc. had to be disabled.

Also, when switching from an Arabic scale to an equal-tempered scale performance, the settings had to be reversed.

Such operations are not only extremely troublesome for the performer, but also may interfere with the performance.

In this way, the present invention is designed to automatically cancel the automatic rhythm performance device, automatic accompaniment device, etc. when switching from the 12-tempered scale to a special scale such as the Arabic scale, so that there is no trouble or hindrance to the performance. The purpose is to
In an electronic musical instrument comprising a scale tone switching device that switches between a 2-equal tempered scale and other scale notes, and at least one of an automatic accompaniment device and an automatic rhythm performance device, the scale tone switching device has a 12-equal tempered scale tone. A switch is provided that is activated when switching to a note other than the scale, and an output signal from the switch disables at least one of the automatic accompaniment device and the automatic rhythm performance device.

Next, embodiments of the present invention will be described with reference to the attached drawings.

Figure 1 is an overall block diagram. 1 is a scale tone switching device that switches between 12 equal-tempered scale tones and other scale tones, for example, Arabic scale tones; 2 is a scale tone switching device that switches between 12 equal-tempered scale tones and Arabic scale tones depending on its output; The figure shows a sound source circuit that emits a musical tone signal by being switched to a tone, and its output terminal group is connected to a gate circuit group 3.
and a speaker 6 via a filter group 4 and an amplifier 5.
connected to.

Reference numeral 7 indicates an automatic accompaniment device and an automatic rhythm performance device. A group of output terminals was input, and the group of output terminals was connected to the group of filters 4.

Further, the output terminal of the automatic rhythm performance device 7b was connected to the input terminal of the amplifier 5.

8 controls the keyboard circuit, and uses its output to open and close the gate circuit group 3, the automatic accompaniment device 7a, and the automatic rhythm performance device 7b.
and caused the operation to take place.

The scale switching device 1 is provided with a switch 9 that is linked to the Arabic scale switching selection operation, and the output signal of the switch 9 is used to control the automatic accompaniment device 7a and the automatic rhythm performance device 7.
b was made inactive.

The scale switching device 1 and the tone source circuit 2 are configured as shown in FIG. 2, for example.

That is, the tone source circuit 2 has a first oscillator group 11 for one octave which emits musical tone signals with a frequency with a pitch difference of 100 cents, and a frequency that is 50 cents higher than each oscillation frequency of the first oscillator group 11. a second oscillator group 12 that emits shifted musical tone signals; a third oscillator group 13 whose frequency is shifted by 50 cents lower than the first oscillator group 11;
A plurality of AND gates 11-1...11-1 to which each output terminal of the third oscillator group 11, 12.13 is connected.
2.12-1...12-12.13-1...
...13-12 and these AND gates 11-1...
...11-12.12-1...12-12
．． 13-1...... An OR circuit 14-1... in which the output terminals of 13-12 are commonly connected from the first one.
14-12 and these OR circuits 14-1...1
It consists of a divider 15 to which the output terminals of 4-13 are connected.

The scale switching device 1 has a first, second, and third contact point abc.
It consists of changeover switches 1-1...1-12, and each first contact a is connected to the AND gate 11-1...
・Connect to 11-12 respectively, and each second contact is the AND
Connected to gates 12-1...12-12, respectively,
Each third contact C is the AND gate 13-1...
13-12, respectively.

Thus, when each changeover switch 1-1...1-12 is connected to the intermediate first contact a, the musical tone signal from the first oscillator group 11 is directly input to the divider 15. 12 equal temperament scale tones are obtained.

Next, when the desired one of the changeover switches 1-1...12 is switched to the second contact, the AND gate 12-1...
...12-12 is opened to obtain a musical tone signal with a frequency 50 cents higher, and when the third contact C is switched, AND gate 13-1...13
-12 is opened to obtain a tone signal with a frequency 50 cents lower.

That is, these changeover switches 1-1...1-12
12 when connecting all of them to the first contact a at the neutral position.
An equal temperament scale tone signal is obtained, and the second and third contacts are adjusted accordingly.
By connecting to c, an Arabic scale tone signal can be obtained (for details of the Arabic scale, please refer to the above-mentioned patent application published in 1973).
No. 1-102211 and Japanese Patent Application No. 1032-1980, etc.).

FIG. 3 shows a specific embodiment of the present invention.

In the figure, the automatic accompaniment device 7a is the rhythm pulse generator 2.
0 and an automatic accompaniment chord signal generator 21, and the automatic rhythm playing device 7b consists of an automatic rhythm sound signal generator and is driven by rhythm pulses from the rhythm pulse generator 20.

Switch elements 22 and 23 each consisting of an FET are inserted into the circuits connecting the rhythm pulse generator 20 to the automatic accompaniment chord signal generator 21 and the automatic rhythm sound signal generator 7b.

The switch 9 is the scale changeover switch 1-1...
...1-12 consists of switches 9-1...9-12 that are closed in conjunction with switching to the second and third contacts S and C, and these switches 9-1...-9 -12 movable contacts are connected in common and connected to the control poles of each switching element 22, 23 via transistors 24 and 25, respectively.

26 is a drive switch for the automatic accompaniment chord signal generator 21;
It was provided in parallel to the transistor 24.

27 is a drive switch for the automatic rhythm sound signal generator 7b, and is provided in parallel with the transistor 25.

Now, in the selected state of 12 equal temperament scale notes with each scale changeover switch 1-1...1-12 connected to the first contact a, when the drive switch 26.27 is opened as shown in the figure, each switch Elements 22 and 23 conduct, and rhythm pulses are applied to the circle generators 21, 7b, accompaniment chord signals and rhythm tone signals are obtained in accordance with the rhythm pulses, and automatic accompaniment performance and automatic rhythm performance are performed.

Next, in order to switch to the Arabic scale, for example, when the scale selection switch 1-1 is switched to the second contact or the third contact C, the switch 9-1 is closed and the transistors 24.25
is ON, each switch element 22 and 23 is OFF,
The passage of rhythm pulses is stopped and these circle generators 21
, 7b are stopped, and the automatic accompaniment performance and automatic rhythm performance are stopped.

In this way, according to the present invention, when the performance is switched from the 12-equal-tempered scale to another scale such as the Arabic scale, at least one of the automatic accompaniment device and the automatic rhythm performance device is stopped. There is an advantage that there is no need to separately operate at least one of the automatic accompaniment device and the automatic rhythm performance device when switching from one scale to another, and there is no problem with performance.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an example of implementing the present invention, FIG. 2 is a specific circuit diagram of a part thereof, and FIG. 3 is a specific circuit diagram of an example of implementing the present invention. 1...Scale note switching device, 7...Automatic accompaniment, automatic rhythm performance device, 7a...Automatic accompaniment device, 7b...Automatic rhythm performance device, 9...
··switch.

Claims (1)

[Scope of utility model registration request] In a scale switching device that switches between 12 equal temperament scale notes and other scale notes, and at least one of an automatic rhythm performance device and an automatic accompaniment device, the scale switching device has a scale other than 12 equal temperament scale notes. An electronic musical instrument comprising a switch that is activated when switching to tone, and at least one of the automatic rhythm performance device and the automatic accompaniment device is deactivated by an output signal of the switch.