JPH0566771A - Electronic musical instrument with display device - Google Patents

Abstract

PURPOSE:To provide an electronic musical instrument with a display device capable of displaying by switching an image without exerting an effect in point of speed on musical sound generating processing. CONSTITUTION:It is discriminated whether or not the value of a rhythm counter is less than 3(step A21), and when such discrimination shows NO, it is decided that the processing time of rhythm sound generating processing approaches. Therefore, only processing to turn on a change FLAG is performed without executing the processing on picture data in such case(step A25). On the other hand, when the discrimination at the step A21 shows YES, it is decided that temporal allowance to the rhythm sound generating processing exists. Therefore, the picture data in accordance with the picture No. of a Reg 1 is transferred to the display area 1 of a RAM 16 in such case(step A22). Following that, the picture No. of the Reg 1 is set on the present picture No.(step A23), thereby, the image being displayed on an LCD can be switched to a still picture in accordance with a mode and a tone color set this time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic musical instrument equipped with a display device for displaying an image corresponding to a mode, tone color or the like set by operating a mode switch or tone color switch provided on the electronic musical instrument.

[0002]

2. Description of the Related Art As a conventional electronic musical instrument, there is known an electronic musical instrument with a display device in which a display device such as an LCD is provided in a musical instrument body and a predetermined image is displayed on the display device. This electronic musical instrument is equipped with a mode setting switch that sets one of a plurality of modes, a tone color selection switch that selects and sets one of a plurality of tones, and is set by operating each switch. The screen data corresponding to the mode or tone color is stored in the storage means such as the ROM. When a desired mode or tone color is set by operating the switch, screen data corresponding to the set mode or tone color is read out from the ROM and transferred to a storage area provided in the RAM or the like for temporary storage. .. The screen data transferred to this storage area is L-formatted after being converted into LCD data.
The image is transferred to a CD, whereby a still image corresponding to the set mode, tone color, etc. is displayed on the LCD. Therefore, the user of the electronic musical instrument can recognize the currently set mode and timbre by visually observing the image displayed on the LCD.

Also, such an electronic musical instrument with a display device has an automatic performance function and an automatic accompaniment function as in a general electronic musical instrument. For example, a desired rhythm is selected and the automatic accompaniment is started. And, a certain rhythm pattern is automatically played repeatedly. Therefore, by operating an operator such as a keyboard while the automatic accompaniment is started, it is possible to perform with the rhythm pattern.

[0004]

However, the LCD is
The amount of screen data required to display an image on the screen is enormous, and even a single screen has a capacity of several megabytes. Therefore, a large amount of processing is required when transferring the screen data from the ROM to the RAM storage area. It takes time. In particular, when the display device is large, the amount of information of the screen data increases accordingly, and the processing time for transferring the screen data further increases. At this time, the transfer processing of the screen data is carried out by the CPU which performs the generation processing of the musical sound corresponding to the automatic accompaniment or the operation of the keyboard, and therefore the generation processing of the musical sound is performed during the transfer processing of the screen data. Will not be possible. As a result, the tone generation process is delayed, and the time until the one-sampling data process is completed becomes long, making it impossible to execute the tone generation process at a speed that can maintain the tempo of the music. Therefore, when it is necessary to switch and display images in response to the operation of the mode setting switch or tone color selection switch while performing automatic accompaniment, the tempo of automatic accompaniment slows down, and a certain appropriate There is a disadvantage that it becomes impossible to perform automatic accompaniment at the tempo.

The present invention has been made in view of the conventional problems as described above, and provides an electronic musical instrument with a display device capable of switching and displaying images without affecting the tone generation processing speedily. The purpose is that.

[0006]

In order to solve the above-mentioned problems, according to the present invention, a screen data storage means for storing a plurality of screen data and any screen data stored in the screen data storage means. A transfer means for selectively transferring, a display means for switching and displaying images based on the screen data transferred by the transfer means, and a tone generation processing means for executing a process related to the generation of a tone at fixed time intervals. ,
Discriminating means for discriminating whether or not the time interval until the next time the musical sound generating means executes the processing is a predetermined value or more at an interval different from the time interval in which the musical sound generating processing means performs the processing; Based on the determination result of the determination means, the display switching control means for suspending the transfer operation of the transfer means when the time interval is less than the predetermined value and permitting the transfer operation of the transfer means when the time interval is more than the predetermined value. It has and.

[0007]

In the above construction, the musical tone generation processing means executes the processing relating to the generation of the musical sound, for example, the processing relating to the generation of the rhythm sound at regular time intervals, and the rhythm sound is generated by this processing. On the other hand, the transfer means selects and transfers any of the plurality of screen data, and the image corresponding to the transferred screen data is displayed on the display means. At this time, the discriminating means discriminates whether or not the time interval from the time when the musical sound generation processing means performs the processing to the next processing time is a predetermined time or more, ,
The transfer operation of the transfer means, that is, the operation of the transfer means selecting and transferring the screen data from the storage means is suspended.
Therefore, when the time when the musical sound generating means performs the next processing is imminent, the transfer processing of the screen data is not executed, so that the processing related to the generation of the musical sound and the transfer processing of the screen data are time-consuming. Will never be done close to.

When the time interval is equal to or more than a predetermined value, that is, when the musical tone generation processing means has time to perform the next musical tone generation processing, the transfer operation of the transfer means is permitted. As a result, the transfer means transfers the screen data from the storage means to the display means, and the display means displays the image corresponding to the transferred screen data, whereby the image displayed by the display means is switched.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. That is, FIG. 1 is a block diagram showing the overall structure of the electronic musical instrument according to this embodiment.
Has a rhythm counter and has a program ROM 11
The sound generation and mute processing is performed based on the program stored in advance and the data temporarily stored in the work RAM 12.
In addition, the CPU 10 changes the value of the rhythm counter,
The automatic accompaniment process necessary for generating the rhythm sound that constitutes the automatic accompaniment is performed at regular time intervals, the value of the rhythm counter is constantly monitored, and it is determined whether or not the value is a predetermined value or more.

The data ROM 14 stores screen data necessary for displaying the still images (a) to (d) shown in FIG. 2 on the LCD 13. The CPU 10 operates the data ROM 1 in accordance with the mode and tone color set by operating the switches in the keyboard / switch group 15.
One of the screen data corresponding to the still images (a) to (d) stored in 4 is selected and transferred to the display area for temporarily storing the screen data provided in the data RAM 16. At this time, the CPU 10 determines whether to transfer the screen data to the storage area or temporarily suspend the transfer, depending on the result of the determination as to whether the value of the rhythm counter is equal to or greater than a predetermined value.

The display gate array 17 is a CPU.
In accordance with an instruction from 10, the screen data transferred to the display area of the data RAM 16 is accessed, the screen data is format-converted into data for the LCD 13, and the format-converted screen data is displayed on the LCD 13.
Transfer to. As a result, the data RA
An image corresponding to the screen data transferred to M16, that is, an image corresponding to the mode and timbre is displayed.

The LCD 13 is provided in the musical instrument body 22 as shown in FIG. The instrument body 22 is provided with a keyboard 23 constituting the keyboard / switch group 15 and a switch group 24 including various mode setting switches and tone color selection switches. When the automatic accompaniment is started and stopped, the switch group 24 is provided. A rhythm switch 25 that is operated to is provided.

Further, the data ROM 14 stores rhythm pattern data necessary for execution of automatic accompaniment together with the respective screen data. Then, the CPU 10
Based on the rhythm pattern data stored in advance in the data ROM 14 and the result of scanning the keyboard 23, the tone generator LSI 18 is controlled to generate a tone signal. The tone signal is analog-converted by the D / A converter 19 and input to the amplifier section 20. When the speaker 21 is driven by the signal amplified by the amplifier section 20, the speaker 21 generates a musical tone having a pitch corresponding to the operation of the keyboard 23 or a rhythm sound corresponding to the rhythm pattern data.

Next, the operation of this embodiment having the above configuration will be described with reference to the flow charts showing the contents of the program executed by the CPU 10 shown in FIGS. Figure 4-
A series of flowcharts shown in FIG. 7 is a main routine of the present embodiment, and the CPU 10 starts execution by turning on a power source (not shown) provided in the musical instrument body 22. That is, first, the initialization process is executed to set the initial data in the tone color data, the mode data, etc. stored in the work RAM 12 (step A
1) Then, from the data R0M14 to the data RAM1
The initial screen data is transferred to the display area 1 of 6 (step A2). Next, the display gate array 17
Then, the start address of the display area 1 of the data RAM 16 and the number of data bytes (data amount) are transferred (step A3). Then, the display gate array 17 accesses the display area 1 based on the start address and the data Byte, and transfers the initial screen data to the LCD 13 after converting the format of the initial screen data into LCD data. As a result, the LC
D13 displays the initial screen shown in FIG.

Further, the keyboard 23 is scanned (step A
4) Determine the change state of the key state (step A
5) If this determination is ON and there is a key press, the tone generator LSI 1 outputs the pitch data and the tone color data corresponding to the key press.
8 (step A6). As a result, the sound source L
The SI 18 generates a tone signal, a tone is generated from the speaker 21 in accordance with the pitch data and tone color data, and when the key is released (OFF), a mute process (step A7) is executed. The sound output from the speaker 21 is stopped.

Subsequently, the switch group 24 is scanned (step A8 in FIG. 5) to determine whether or not any switch in the switch group 24 has been turned on (step A9). If this determination is YES and any switch is turned on, it is determined whether the operated switch is the rhythm switch 25 (step A10). This determination is also YES, and when the operated switch is the rhythm switch 25, it is determined whether or not the rhythm RUN is currently in progress, that is, whether or not the rhythm performance is currently being executed (step A11). .. The rhythm switch 25 is a rhythm stop switch when turned on in the rhythm RUN state and a rhythm start when turned on in the stopped state. When the rhythm switch 25 is turned on while the rhythm is stopped, the determination is NO and the rhythm RUN is set in the flag register in the CPU 10.
The FLAG is turned on (step A12). When the rhythm switch 25 is turned on while the rhythm is running, the determination in step A11 is YES, and the rhythm RUN FLAG is turned off (step A).
13).

On the other hand, if the determination in step A10 is NO and the switch that has been turned on is a switch other than the rhythm switch 25, the switch that has been turned on is analyzed (step A14), and then In the result of this analysis, it is determined whether or not the mode, tone color, etc. have changed (step A15). If this determination is YES and the mode setting switch is operated to set a different mode from the present, or if the tone color selection switch is operated to select a tone color different from the present, the mode corresponding to these is selected. A tone color changing process is executed (step A16).

Next, the screen No. corresponding to the changed mode, tone color, etc. Is set to Reg1 (step A1
7). That is, as described above, in the data ROM 14,
Screen data of a plurality of still images (however, (a) is an initial screen) to be displayed when each mode and timbre of FIG. 2 (a) to (d) is set is stored. Of the screen data of still images (b) to (d) stored in the ROM 14, a screen No. indicating the screen data of the still image corresponding to the mode and tone color changed and set this time. R
It is set to eg1.

Subsequently, the screen No. of the still image currently displayed on the LCD 13 is displayed. And the screen No. that was previously set to Reg1. (Step A18 in FIG. 6), the screen Nos. Is determined (step A1)
9). This determination is YES, and the screen No. of the still image currently displayed on the LCD 13 is displayed. And step A17
Screen No. set to Reg1 in. If the two match, it is determined whether or not the display change FLAG is in the on state (step A20). This display change FLAG is a flag that is turned on in step A25 described later,
Since it is in the off state at this point, this determination is NO.
Therefore, the process proceeds from step A20 to step A26 in FIG.

That is, when the determination in step A19 is YES, the current screen number. And Reg1 screen No. If the display change FLAG indicating that the display should be changed is in the off state, it is not necessary to change the display even if the mode setting switch or the tone color selection switch is operated. .. Therefore, in this case, the determination process relating to the rhythm performance of step A26 is started without performing the determination process relating to the display change after step A21.

On the other hand, the current screen No. And Reg1
Screen No. If they do not match (if the determination in step A19 is NO), and if the display change FLAG is in the on state (when the determination in step A20 is YES), the process related to the display change is performed. There is a need to do. Therefore, it is first determined whether or not the value of the rhythm counter is less than 3 (step A21). The value of the rhythm counter is increased by the interrupt process shown in FIG. 8 which is executed by interrupting the main routine at regular intervals.

That is, in the interrupt process of FIG. 8, it is first determined whether or not the rhythm RUN FLAG is in the on state (step B1). If the determination is YES and the rhythm RUN FLAG is in the on state. For this, the rhythm counter is incremented (step B2). Next, it is judged whether or not the value of the rhythm counter is equal to or larger than a predetermined MAX value (for example, "5") (step B3). If the judgment is NO, the routine returns while Y is returned.
If it is ES, the value of the rhythm counter is cleared to 0 (step B4). Therefore, Rhythm RUN F
While the LAG is in the ON state, that is, while the rhythm performance is being executed, the rhythm counter repeatedly counts up from 0 to the MAX value in this interrupt process. Then, each time the value of the rhythm counter reaches the MAX value, the rhythm process is executed in step A27 of FIG. 7 described later. By this rhythm processing, the rhythm sound is emitted or muted from the speaker 21, and as a result,
The rhythm sound selected in advance is played. Further, the determination in step B1 becomes NO, and the rhythm RUN FLA
When G is turned off, the rhythm counter is immediately cleared to 0 (step B4).

Therefore, in step A21 of FIG. 6, when it is determined whether or not the value of the rhythm counter thus incremented at regular intervals is less than 3,
If this determination is NO and the value of the rhythm counter is 3 or more, the processing time of the rhythm processing executed at the time of this MAX value (= 5) is in an imminent state. Therefore, if the process of transferring the screen data to the display area of the data RAM 16 is performed at this time, the amount of information of the screen data is enormous, and since one screen has a capacity of several megabytes, it is transferred. In that case, a long processing time is required, and as a result, the rhythm processing is delayed, and the tempo of the generated rhythm goes wrong.

Therefore, when the determination in step A21 is NO and the value of the rhythm counter is 3 or more, the change FLAG is turned on without executing the processing for the screen data in steps A22 to A24. Is performed (step A25), and step A26 in FIG. 7 is performed.
Proceed to. Then, in this step A26, the rhythm RU
It is determined whether or not N FLAG is in the ON state. If this determination is YES and the rhythm performance is being executed, the value of the rhythm counter is M as described above.
Rhythm processing is performed every time it becomes AX (step A27).
That is, when the time point at which the screen displayed on the LCD 13 is changed is temporally close to the time point at which the rhythm process is performed, only the rhythm process is performed without changing the screen. There is no delay in processing, and the tempo of the rhythm that is occurring does not change.

On the other hand, the determination in step A21 of FIG. 6 is YE.
If S and the value of the rhythm counter is less than 3,
There is a time margin before the rhythm processing that is performed when the value of the rhythm counter reaches “5”. Therefore, in this case, the screen No. of Reg1 is displayed. The operation of transferring the screen data corresponding to (1) to the display area 1 of the data RAM 16 (step A22) is permitted. Continue to the current screen N
o. No. of Reg1 screen No. Set (Step A2
3), the screen No. set in this Reg1. By supplying the screen data corresponding to L to the LCD 13,
The image displayed on the CD 13 is switched to the still image of any of (b), (c), and (d) corresponding to the mode and tone color set this time. Next, after the display change FLAG is turned off (step A24), the above-mentioned discrimination processing relating to the rhythm performance of steps A26 to A28 of FIG. 7 is executed.

Therefore, in steps A22 to A24, the processing for the screen data such as the transfer of the screen data is started when the value of the rhythm counter is less than 3, so that the value of the rhythm counter is "5". When the rhythm process is started at the time of "", the transfer of the screen data and the like have already been completed. Therefore, the rhythm process is not delayed, and the image displayed on the LCD 13 can be changed according to the change of the mode and the tone color while maintaining the rhythm of the rhythm performance at a constant rhythm.

When the screen change processing (steps A22 to A24) and the rhythm processing (step A27) are close in time, the rhythm processing is prioritized. In some cases, the timing at which the image changes on the LCD 13 is delayed when the tone color is changed. However, since the image displayed on the LCD 13 is a still image, even if the change timing is delayed, there is no possibility of causing a visual discomfort.

[0028]

As described above, according to the present invention, it is determined whether or not the time interval until the next processing time point of the processing related to the generation of the musical tone executed at a constant time interval is a predetermined value or more. When the time interval is less than the predetermined value, the screen data transfer process is suspended, and when the time interval is more than the predetermined time, the screen data transfer process is performed. Therefore, the process related to the generation of the musical tone and the screen data transfer process are
It will not be executed when time approaches,
By the transfer processing of the screen data which requires a long processing time at the time of transfer, it is possible to avoid the inconvenience that the processing related to the generation of the musical sound is delayed. Therefore, it is possible to accurately perform the processing related to the generation of the musical sound at regular time intervals, and thereby it is possible to switch and display the images while maintaining the tempo of the musical sound generated.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a plan view showing an example of an image displayed by the same embodiment.

FIG. 3 is a plan view showing the outer appearance of the musical instrument body of the embodiment.

FIG. 4 is a flowchart showing a part of a main routine of the embodiment.

5 is a flowchart following steps A6 and A7 in FIG.

FIG. 6 is a flowchart following steps A15 and A17 of FIG.

7 is a flowchart following steps A24 and A25 in FIG.

FIG. 8 is a flowchart showing an interrupt routine of the embodiment.

[Explanation of symbols]

 10 CPU 13 LCD 14 Data ROM 16 Data RAM 17 Display Gate Array 24 Switch Group 25 Rhythm Switch

Claims (1)

[Claims] 1. A screen data storage unit that stores a plurality of screen data, a transfer unit that selects and transfers any screen data stored in the screen data storage unit, and the transfer unit that transfers the screen data. Display means for switching and displaying images based on screen data, musical tone generation processing means for executing processing relating to musical tone generation at fixed time intervals, and time interval for the musical sound generation processing means to perform the processing are different. A determination unit that determines whether or not the time interval until the time when the musical sound generation unit executes the processing next at an interval is a predetermined value or more, and the time interval is less than a predetermined value based on the determination result of the determination unit. A display switching control means for suspending the transfer operation of the transfer means at a certain time and permitting the transfer operation of the transfer means when the time interval is equal to or more than a predetermined time. An electronic musical instrument with a display device.