JPH0460591A - Electronic musical instrument - Google Patents

Abstract

PURPOSE:To rewrite the contrast data on a liquid crystal display element which is stored in a memory by switching either of a 1st and a 2nd operation element from a tempo control means, etc., to the memory by a switching means. CONSTITUTION:A rotary encoder 11 is operated to set the contrast of the liquid crystal display element L which matches the operator. Then when a mode switch 2 is depressed again, a mode control means 3 sense the operation of the mode switch 2 to switch the connection of a switch 4a to its initial state and the output of the rotary encoder 11 is inputted to the tempo control means 9. At this time, a D/A converter 6 reads data out of the memory 5 and converts it into analog data to set the contrast of an LCD 8. Thus, the mode switch 2 is operated to switch the switch 4a and the rotary encoder 11 is operated to adjust the contrast of the LCD 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electronic musical instrument equipped with a liquid crystal display element.

[Prior Art] In recent years, it has become mainstream for electronic musical instruments to be equipped with a liquid crystal display element (hereinafter abbreviated as rLCDJ) and to be in an interactive format in order to simplify operation and ease of use. and,
Furthermore, in order to make the display easier to see, the viewing angle (hereinafter referred to as "contrast") of the LCD can be adjusted using a variable resistor.

A conventional electronic musical instrument will be described below with reference to the drawings.

The third part is a block diagram for explaining a conventional example. In Fig. 3, 1 is the rotary encoder 11 or UP/
A control panel consisting of a DOWN switch 12 (12a, 12b), etc., 9 is a tempo control means, 10
12a is a switch for incrementing the timbre number, 12b is a switch for decrementing the timbre number, 21 is a variable resistor for setting the contrast of the LCD 8, and 22 is a control means.

The operation of the electronic musical instrument configured as described above will be explained below.

The reference voltage (2) is divided by the variable resistor 21 of the control panel 1, and the divided voltage is sent to the LCD 8 as a control signal A for setting the contrast of the LCD 8.

That is, by operating the variable resistor 21, the LCD
8 contrast can be adjusted.

Further, based on information from the rotary encoder 11 and the UP/DOWN switch 12, the control means 22 sends the respective information to the tempo control means 9 and the timbre control means 10 to change the tempo and timbre.

[Problem to be solved by the invention]

However, in the conventional configuration described above, a variable resistor 21 must be provided to set the contrast of the LCD 8, which increases the cost accordingly.

Furthermore, when people of different heights use the device, it is necessary to operate the variable resistor 2I and reset the contrast of the LCD 8 each time.

A first object of this invention is to provide an electronic musical instrument with low cost.

A second object is to provide an electronic musical instrument that allows the contrast of the LCD to be changed with a simple operation when used by people of different heights.

[Means to solve the problem]

The electronic musical instrument according to claim ( ]) comprises: a tempo control means for changing the speed of the music; a timbre control means for changing the tone of the musical tone;
It includes a first operator for operating the tempo control means, a second operator for operating the timbre control means, a liquid crystal display element, a memory, a D/A converter, and a switching means.

The memory stores contrast data of the liquid crystal display element and can be rewritten by the first or second operator.

The D/A converter reads out the contrast data from the memory, converts it into analog data, and inputs it to the liquid crystal display element.

The switching means is configured to switch one of the first and second operators from one of the tempo control means and the timbre control means to the memory.

The electronic musical instrument according to claim (2) is the electronic musical instrument according to claim (1), in which the memory is composed of a plurality of memory sections, and one of the plurality of memory sections can be selected for reading and rewriting.

[Effect]

According to the configuration described in claim (1), when setting the contrast of the liquid crystal display element, the switching means switches one of the first and second operators from one of the tempo control means and the tone control means to the memory. This allows the contrast data of the liquid crystal display element stored in the memory to be rewritten using the first or second operator.

According to the structure set forth in claim (2), in the structure set forth in claim (1), the memory is made up of a plurality of memory sections, and one of the plurality of memory sections can be selected for reading and rewriting. Therefore, the contrast of the liquid crystal display element can be set with a simple operation, and the contrast data of the liquid crystal display element stored in the memory can be rewritten using the first or second operator.

[Embodiment] A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram for explaining a first embodiment of the present invention. In FIG. 1, 1 indicates a rotary encoder 11 and an UP/DOWN switch 12 (12a, 12
2 is a mode switch for setting programs such as MIDI of the electronic musical instrument and the contrast of the LCD 8; 3 is a mode control means; 4 is a switch 4a for selecting information from the rotary encoder 11; Control means, 7 is memory 5 and D/A
Contrast control means having a converter 6, 9 a tempo control means, 10 a timbre control means, 12a a switch for incrementing a timbre number, and 12b a switch for decrementing a timbre number. Note that mode switch 2. The mode control means 3 and the switch 4a constitute a switching means.

The operation of the electronic musical instrument configured as described above will be explained below.

Normally, the switch 4a in the control means 4 is in a state of connecting the rotary encoder 11 and the tempo control means 9,
The output of the rotary encoder 11 is the tempo control means 9
is input to control the tempo.

At this time, when the mode switch 2 is pressed to adjust the contrast of the LCD 8, the mode control means 3 senses the operation of the mode switch 2, switches the connection of the switch 4a, and the output of the rotary encoder 11 is changed to the contrast control means. This is the input to 7. Contrast control means 7
The data input to is stored in the memory 5. and,
The D/A converter 6 reads the data stored in the memory 5, converts it into analog data, and sets the contrast of the LCD 8.

In this way, by operating the rotary encoder 11, the user can set the contrast of the LCD 8 that suits him/her. Then, when the mode switch 2 is pressed again, the mode control means 3 senses the operation of the mode switch 2 and switches 4a
The output of the rotary encoder 11 becomes an input to the tempo control means 9. At this time, the D/A converter 6 reads the previously set data stored in the memory 5 and converts it into analog data.
The contrast of CD8 is set. Also, when the power is turned on, similar processing is performed using previously set data.

As described above, according to the first embodiment, the switch 4a is switched by operating the mode switch 2, and the contrast of the LCD 8 can be adjusted by operating the rotary encoder 11.

That is, the rotary encoder 11 is used for tempo control and L
By using it in conjunction with the contrast control of the CD8, the variable resistor 21 for adjusting the contrast of the LCD8, which is conventional, is no longer necessary, and the D/A converter 6 can be constructed using an inexpensive ladder or gate array with a small number of bits. Therefore, it is possible to provide an electronic musical instrument with a low cost as a whole.

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

FIG. 2 is a diagram for explaining a second embodiment of the invention. In FIG. 2, 1314.15 is a contrast setting switch, and 16 is a switch 4a that selects information from the rotary encoder 11 when the contrast setting switch 13, 14, or 15 is operated.
21 is a contrast control means having a memory selection means 17, a plurality of memory sections 1B, 19.20 and a D/A converter 6, and the other configurations are the same as in the first embodiment. be. Note that the contrast setting switches 13, 14, and 15, the logic circuit 16, and the switch 4a constitute a switching means.

The operation of the electronic musical instrument configured as described above will be explained below.

Normally, the switch 4a in the control means 4 is in a state of connecting the rotary encoder 11 and the tempo control means 9,
The output of the rotary encoder 11 is the tempo control means 9
is input to control the tempo.

At this time, in order to adjust the contrast of LCD8,
When any one of the contrast setting switches 131415 is pressed, the logic circuit 16 senses the operation of the contrast setting switches 1314.15, changes the connection of the switch 4a, and switches the rotary encoder 1.
The output of 1 becomes the input to the contrast control means 21.

In the contrast control means 21, the contrast setting switches 13, 1 operated by the memory selection means 17
4. Select the memory section 1819.20 corresponding to 15,
The selected memory section 18.1920 is connected to the D/A converter 6. For example, when the contrast setting switch 13 is operated, the memory selection means 17 selects the memory section 18 corresponding to the contrast setting switch 13, and the memory section 18 and the D/A converter 6 are connected.

Then, the D/A converter 6 selects the selected memo 17 part 1.
8. Read the data stored in 19.20, convert it to analog, and set the contrast of the LCD 8. At this time, the three contrast setting switches 13 and 14
．． If you cannot set the contrast of the LCD 8 that suits you even after operating all 15, select one of the contrast setting switches, for example 13, to adjust the contrast according to the data stored in the memory section 18. When set, rotary encoder 1
1, the user can increase or decrease the value of the data stored in the memory section 18 to set the contrast of the LCD 8 that is suitable for the user. Then, the data at that time will be newly stored in the memory section 18.

In this way, you can set the contrast of the LCD 8 that suits you. Then, when the contrast setting 1 inch 1314.15 that was operated when setting the contrast is pressed again, the logic circuit 16 activates the contrast setting 1 inch 13.
, 14, 150, the connection of the switch 4a is changed to the initial state, and the output of the rotary encoder 11 becomes the manual power to the tempo control means 9. At this time, the memory selection means 17 selects the previously selected memory section 18192.
0 and the D/A converter 6, and the D/A converter 6
Now, read out the data stored in the previously selected memory section 1819.20, convert it to analog, and display it on the LCD8.
The contrast is set. Also, when the power is turned on, similar processing is performed using previously set data.

As described above, according to the second embodiment, the contrast of the LCD 8 can be adjusted by operating the rotary encoder 11. That is, by using the rotary encoder 11 for both tempo control and contrast control of the LCD 8, the conventional variable resistor 21 for adjusting the contrast of the LCD 8 becomes unnecessary. moreover,
By using a plurality of memory sections 18, 19, 20, it is possible to store a plurality of contrast data in advance, and by selecting the contrast setting switch 13.1415, it is no longer necessary to adjust the contrast of the LCD 8 each time. It disappears.

Further, in the second embodiment, the memory section 181920 is assumed to be a RAM, but if the settings do not need to be changeable, it may be a ROM as long as possible values are preset.

In the first and second embodiments, the rotary encoder 11 is used to adjust the contrast of the LCD 8, but the IP/DOWN switch 12 may also be used.

[Effects of the Invention] In the electronic musical instrument according to claim (1), when setting the contrast of the liquid crystal display element, the switching means switches one of the first and second operators to one of the tempo control means and the timbre control means. By switching from to the memory, the contrast data of the liquid crystal display element stored in the memory can be rewritten using the first or second operator. As a result, a conventional variable resistor for contrast setting is not required, and an electronic musical instrument can be provided at a low cost as a whole.

In the electronic musical instrument according to claim (2), in the configuration according to claim (1), the memory is made up of a plurality of memory sections, and one of the plurality of memory sections can be selected for reading and rewriting. The contrast of the liquid crystal display element can be set with a simple operation, so when used by people of different heights, the memory section that stores contrast data suitable for the height can be selected from among multiple memory sections. Just do it.

[Brief explanation of the drawing]

FIG. 1 is a block diagram for explaining a first embodiment of this invention, FIG. 2 is a block diagram for explaining a second embodiment of this invention, and FIG. 3 is a block diagram for explaining a conventional example. FIG. 2...Mode switch, 3...Mode control means, 4
a... Switch, 5... Memory, 6... D/A converter, 8... Liquid crystal display element, 9... Tempo control means, 10... Tone control means, 11... Rotary encoder, 12...UP/DOWN switch, 13, 1
4.15... Contrast setting switch, 16... Logic circuit, 7... Memory selection means, 20... Memory section

Claims (2)

[Claims] (1) A tempo control means that changes the speed of the music, a timbre control means that changes the timbre of the musical sound, a first operator that operates the tempo control means, and a second operator that operates the timbre control means.
The controller, the liquid crystal display element, and the contrast data of the liquid crystal display element are stored, and the first or second
a D/A converter that reads contrast data from the memory, converts it into analog data, and inputs it to the liquid crystal display element; and one of the first and second operators that controls the tempo control. and switching means for switching from one of the timbre control means to the memory. (2) The electronic musical instrument according to claim (1), wherein the memory comprises a plurality of memory sections, and one of the plurality of memory sections can be selected for reading and rewriting.