JPH04134496A - Display device for electronic musical instrument - Google Patents

Abstract

PURPOSE:To display the output signal level of a musical tone at every musical tone system by putting on the display elements of display means in accordance with sound volume information, and hereinafter, putting on or off one of the display elements at every arrival of count setting an initial value at a prescribed value when the generation of the musical tone is instructed. CONSTITUTION:A display device displays the sound volume of each part of melody 1, melody 2, a code, a base, and rhythm independently, and in the case of using an attenuation sound system represented by a piano, a count initial value T1 in key depression is set equal to a count initial value T2 in key separa tion, and for example, (20H) is used, and one light emitting element is put off at every lapse of time of (20H) after the key depression or key separation. In the case of using a continuous sound system represented by an organ, for exam ple, (FFH) is used as the initial value T1 in key depression, and, for example, (05H) as the initial value T2 in key separation. The display device put on once continues the state until the key separation is performed. Meanwhile, the initial value T2 is an extremely small value, and a time until all the light emitting elements are put off after they are put on is extremely short, and it seems that they are put off in a moment.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to a display device used in an electronic musical instrument such as a synthesizer, an electronic piano, an electronic organ, or a single keyboard, and particularly relates to a display device used for an electronic musical instrument such as a synthesizer, an electronic piano, an electronic organ, or a single keyboard. The present invention relates to a display device for an electronic musical instrument in which visual display can be performed based on the number of light emitting elements lit.

(Prior Art) Conventionally, as one of the display devices included in electronic musical instruments,
Level meters that display the output signal level of musical tones are known. For example, this level meter is provided separately for the left and Ishikawa levels, and is used to adjust the balance between the left and right sound volumes.

Such a level meter has a plurality of light emitting elements arranged in parallel, detects the signal level of an analog musical tone signal generated by a musical tone generating means with a well-known level detector, and emits light according to the signal level. By controlling the number of lighted elements, the musical tone signal level being emitted is visually displayed.

On the other hand, conventional electronic musical instruments are generally configured to have multiple musical tone sequences (parts) such as melody, chorus, chord, rhythm, etc. as a means of generating musical sounds, but each part is The target cL is mixed into two musical tone signals on the left and right sides, or four musical tone signals on the front, rear, left and right sides (this is called an "output series"), and is emitted from, for example, a speaker.

Therefore, the level meter is also provided for each output series to display the output signal level of the musical tone of each output series.

However, especially with electronic musical instruments, it is often the case that the performance features a predetermined part, or the volume of each part is adjusted to perform at the optimal rhythm for the music. It is desired that it can be displayed visually.

Therefore, it is conceivable to display the signal level for each musical tone series, that is, for each part, but since it is necessary to prepare an output series for each musical tone series, the amount of λ-ware increases and the device becomes expensive. There is a problem with this.

(Problem to be Solved by the Invention) This invention solves the problem because, as described above, in a device that displays the output signal level of a musical tone for each musical tone series, it is necessary to prepare an output series for each musical tone series. This was developed to solve the problem of increased equipment costs due to the increase in the number of sounds, and is a simple and inexpensive electronic musical instrument that can display the output signal level of musical tones for each musical tone series regardless of the output series. The purpose of this invention is to provide a display device.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, a display device for an electronic musical instrument of the present invention is provided corresponding to a plurality of musical tone series, each of which is provided with a plurality of display elements. a display means, a first storage means for storing lighting time information of the display element constituting the display means, and when a tone color is selected, reading the lighting time information stored in the first storage means; a second storage means for storing the lighting time information stored in the second storage means; a counting means for counting the lighting time information stored in the second storage means as an initial value; and a counting means for counting the lighting time information stored in the second storage means; It is characterized by comprising a control means that lights up a display element of the display means and thereafter turns off or extinguishes one of the display elements every time the count of the counting means to which an initial value is set reaches a predetermined value. shall be.

(Function) The present invention displays an initial value on the display means corresponding to the volume of the sound when a sound is instructed, and thereafter displays the display according to the lighting time information stored in the first storage means. Since the operation of turning off the display element of the means is performed for each musical tone series,
The volume of each part can be displayed regardless of the output series.

(Embodiment) FIG. 1 is a block diagram showing the overall configuration of an electronic musical instrument to which a display device according to the present invention is applied.

In the figure, ■ is a keyboard, which has switches (not shown) arranged in a matrix shape that open and close in conjunction with the depression/release of each key.

Reference numeral 2 denotes a key depression state detection circuit, which sends a scan signal SGI to the keyboard 1 and receives data SG2 from the switch matrix of the keyboard 1. Further, the received data SG2 is supplied to a tone control circuit 8, which will be described later, and is used for sound generation.

Reference numeral 3 denotes an operation panel, which is provided with various switches such as a power switch, a tone selection switch, a mode designation switch, and a rhythm selection switch.

Reference numeral 4 denotes an operation state detection circuit, which sends a scan signal SG3 to the operation panel 3 and receives data SG4 from the switches on the operation panel 3. Further, the received data SG4 is supplied to the timbre selection device 6.

Reference numeral 5 denotes a data ROM/RAM, which stores various information necessary for generating musical tones, such as automatic performance information, timbre information, and envelope information. Details of the contents of this data ROM/RAM 5 will be described later.

6 is a timbre selection device which selects timbres from the data ROM/RAM 5 in accordance with timbre change information obtained from the operation panel 3 via the operation state detection circuit 4 or timbre change information outputted from the automatic performance device 7, which will be described later. The information is read out and supplied to the musical tone control circuit 8. The timbre selection device 6 also supplies "display time value information J" included in the timbre information read from the data ROM/RAM 5 to the count initial value register 20.

Reference numeral 7 denotes an automatic performance device, which reads automatic performance information stored in the data ROM/RAM 5 and outputs the musical tone forming circuit 8.
In addition, when there is a change in tone color information, the tone color information is sent to the count initial value register 20. This creates the same state as when the keyboard 1 or the operation panel 3 is operated, making automatic performance possible.

8 is a musical tone control circuit, ! ! It allocates a sound generation channel according to the key information sent from the keyboard 1 via the key depression state detection circuit 2, and sends data corresponding to the tone selected by the tone selection device 6 to the musical tone formation circuit 9. be. The functions of the musical tone control circuit 8 are realized by a central processing unit (CPU) such as a microprocessor.

Further, data related to the volume (herosity, pinch, volume, etc.) sent from the musical tone control circuit 8 is also supplied to a display control circuit 22, which will be described later.

Reference numeral 9 denotes a musical tone forming circuit (sound source), which reads out corresponding waveform data from the waveform ROM 10 in accordance with various parameters sent from the musical tone control circuit 8,
This generates a musical tone signal for the output system. The digital musical tone signal generated by this musical tone forming circuit 9 is transferred to the D/A conversion IA.
The signals are sent to the receivers 11a and 11b.

A waveform ROM 10 stores waveform data corresponding to various tones and pitches. Of the waveform data stored in this waveform ROM10, the data ROM/RA
A desired digital musical tone signal is generated by reading out the waveform data stored in the area specified by the address stored in M5 (see Figure 3) at a speed corresponding to the pitch specified on keyboard 1. It is now possible to do so.

11a is a D/A converter for the left channel, and Ilb is a D/A converter for the right channel. These D/A converters 11
a and llb convert the input digital musical tone signal into an analog musical tone signal. These D/A converters 1
The analog musical tone signals converted by 1a and llb are supplied to amplifiers 12a and 12b, respectively.

Amplifiers 12a and 12b amplify input analog musical tone signals. These amplifiers 12a, 12
The musical tone signals amplified in step b are supplied to sound systems 13a and 13b, respectively.

Reference numerals 13a and 13b are sound systems including, for example, speakers and headphones, and musical tones generated by the sound systems 13a and 13b are emitted.

20 is a count initial value register, and data ROM/
It stores display time value information in the tone color information stored in the RAM 5. This count initial value register 2
0 is the count initial value register 1 to each part, that is, melody I, melody 2, chord, bass, and rhythm.
It is composed of 5 parts. First time for this count! 1JI (
The contents of if registers 1 to 5 are set in the counter 21.

21 is a counter, which counts down the set data by one. This counter 21 is also composed of five counters 1 to 5 for each part, that is, melody 1, melody 2, chord, bass, and rhythm. The contents of the count initial value registers 1 to 5 are initialized in response to a control signal from the display control circuit 22. Further, the counter 21 performs a countdown operation in synchronization with a pulse signal sent from a pulse generation circuit 23, which will be described later. The contents of each of these counters 1 to 5 are supplied to the display control circuit 22.

Reference numeral 22 denotes a display control circuit, which controls turning on and off of the display device 24. That is, the display device 24 is turned on in accordance with the data regarding the volume from the musical tone control circuit 8,
Control is performed to turn off the light according to the contents of the counter 21.

A pulse generating circuit 23 generates count pulses for the counter 21. As this pulse generation circuit 23, for example, a timer circuit that generates an interrupt at predetermined time intervals is used.

The interrupt signal generated by this timer circuit is used as a count signal.

24 is a display device. This display device 24 is also composed of five displays 1 to 5 for each part, that is, melody 1, melody 2, chord, bass, and rhythm. Further, each display is composed of five light emitting elements, and each light emitting element can be controlled to turn on and off.

FIG. 2 is a block diagram showing in detail the configuration between the display control circuit 22 and the display device 24. As shown in FIG.

In the figure, 22 is the above-mentioned display control circuit, and the control signal output terminals 5ELO to 5ELO2 of this display control circuit 22 are used to select any one of the five displays LO% to L4%. At the same time as the selection signal is output, display data is output from the output boats PORTO-4.

30 is a selector that decodes the control signal output from the control signal output terminals 5ELO-2 of the display control circuit 22 and supplies an enable signal to one of the five displays LO%-L4%. It is something to do.

31 is a buffer, which serves as a buffer for the display control circuit 22)
Display data output from FORTO-4 is inputted to drive each light-emitting element L#0-L#4 of the display device 24.

In the display device 24, five light emitting elements L#0 to L#4 are successively arranged to constitute a display for one part, and five of these elements collectively constitute the display device.

Each of the light emitting elements described above is composed of, for example, an LED, and the light emitting element of the display device to which an enable signal is supplied from the selector 30 is turned on or off in accordance with display data sent from the buffer 31. ing.

Note that the key depression state detection circuit 2, operation state detection circuit 4, tone selection device 6, automatic performance device 7, musical tone control circuit 8, and display control circuit 22 in the above embodiments may be realized by hardware, or It may be realized by the functions of a central processing unit (CPU), and the count initial value register 20 and counter 21 may also be registers or counters configured by hardware, but they may be provided in memory. It may be a register or a counter.

Next, the operation of the above configuration will be explained.

FIG. 3 is a diagram showing the storage format of the data ROM/RAM 5 in this embodiment. Data ROM/RAM5 has
As shown in the figure, automatic performance information 1 to 4, tone information 1 to N
and programs are stored.

The automatic performance information is data read by the automatic performance device 7 and used for automatic performance, and includes bar marks and per numbers as measure information, key numbers as pronunciation information, steps, gates, and velocity/TA, G.
, a PROG mark as tone color information, a tone color number, etc., and finally, an end mark indicates a break in the performance information. Note that the above TAG is used to specify musical tone series information.

Tone color information is composed of tone information and envelope information.

The tone information includes a waveform readout start address, a waveform readout loop top address, a waveform readout loop end address, envelope group information, accent information, and display time value information 1 to N.

The envelope information is composed of an attack level value, an attack time value, a sustain level value, a decay time value, a release time value, and a release time value.

FIG. 4 is a main flowchart of an electronic musical instrument to which this display device is applied.

First, the musical tone control circuit 8 performs initialization processing (step S
l). This initialization process is performed by the count initial value register 20.
, initializes the counter 21, and performs processing such as setting an initial value in a work RAM (not shown).

Next, key scan processing is performed (step S2). That is, data regarding the key depression state of the keyboard 1 detected by the key depression state detection circuit 2 is taken in. Then, the captured data is searched to determine whether an event has occurred, that is, whether there has been a key press or key release operation (step S3). Here, if it is determined that an event has occurred, it is checked whether the event is an on event, that is, a key press (step S4). When it is determined that it is an on-event, a tone series is set (step S5). That is, musical tone sequences are set according to key ranges and modes. Next, a key press process corresponding to the pressed key is executed (step S6). Details of this key press process will be described later.

If it is determined in step S4 that it is not an on-event, it is recognized that it is an off-event, and the tone sequence cent processing is performed in the same manner as above (step S7), and the key release processing corresponding to the released key is executed. (Step S8).

The details of this key release process will also be described later.

On the other hand, if it is determined in step S3 that there is no event, panel scan processing is performed (step S9).

That is, data regarding the operating state of the operation panel 3 detected by the operating state detection/output circuit 4 is taken in. The captured data is then searched to determine whether an event has occurred, that is, whether any switch on the operation panel 3 has been turned on or off (step 510). Here, if it is determined that an event has occurred, it is checked whether the event is tone color selection, that is, whether a tone color selection switch (not shown) has been operated (step 511). When it is determined that the tone color selection is to be performed, tone color parameters are set in the tone color selection device 6 (step 512).

Next, a count initial value is set in the count initial value register 20 (step 513). This initial count value is display time value information in the tone color information stored in the data ROM/RAM 5.

If it is determined in steps S and l1 that the tone color is not selected, panel processing corresponding to the operated switch is performed (step 514).

On the other hand, if it is determined in step SIO that there is no event, it is checked whether it is the data read timing (step 515), and if it is determined that it is not the data read timing, the process returns to step S2. , repeat the same process again.

When it is determined in step S15 that it is time to read data, it is checked whether or not it is time to read timbre information (step 516), and if it is determined that it is time to read timbre information, the initial value of the count is set. It is set in the count initial value register 20 (step 517). Thereafter, the process returns to step S2 and the same process as above is repeated.

On the other hand, if it is determined in step S16 that timbre information is not being read, it is checked whether data is being read with key information on (step 518). Then, when it is determined that the data is being read with the key information turned on,
The musical tone series is set (step 519), the key press time value is set (step 520), and key press processing is performed (step 521). Thereafter, the process returns to step S2 and the same process as above is repeated.

On the other hand, if it is determined in step 31B that it is not the data read timing due to the key information being turned on, it is recognized that it is the data read timing due to the key information being turned off, and a musical tone sequence is set (step 522), and a key release process is performed ( Step 523), and then returns to step S2 to repeat the same process as above.

FIG. 5 is a flowchart showing details of the key press processing performed in step S6 and step S21 in FIG.

In key press processing, first assign the sound channel (
Step 531). That is, an empty channel is searched among the plurality of sound generation channels included in the tone forming circuit 9, and if there is no empty channel, the channel for ending the sound generation is determined. Next, send the pinch information (step 532).
. The pitch information here includes note information, transpose information, and pitch information for adjusting minute pitches.

Next, volume information is set (step 533). The volume information here is a value determined by taking into account touch (herosity) information, accent information for each tone, etc.
It is expressed in 128 steps from 00H to 7F.

Further, this volume information is set for each tone series. Note that the subscript “□” represents a hexadecimal number.

When the above parameters have been set, a sound generation process is performed by sending these to the tone forming circuit 9 to generate sounds (step 534). Through the above processing, sound will be emitted from the sound systems 13a and 13b.

When this pronunciation process is completed, the cent of the display contents is performed (
step 535). This display content cent processing is a process of centing a bitmap corresponding to volume information into a display buffer.

Here, as shown in FIG. 8, the display buffer is composed of one byte for each tone series, and the lower five bits correspond to the light emitting elements L#0 to L#4 of the display.

In this display content setting process, the display buffer is set as follows according to the volume information value.

■Volume information OOH... Clear all to zero ■Volume information 0
1M-IFM...Bit O Sent■Volume information 208
~4Fx...Bit O11 Sef)■Volume information 508~
5F, I... Bit O ~ 2 sets ■Volume information 60. ~
6Fn...Bit O ~ 3 sets ■ Volume information 7011 ~
7F, 4... Bits O to 4 are set.Then, the display contents are output (step 536). This is a process for outputting the contents of the display buffer 7 created in step S35 above from the output ports PORTO to 4 of the display control circuit 22 to the display device 24 via the buffer 3I. As a result, the indicator selected by the selector 30 emits light.

Next, counter cent processing is performed (step 537).
. That is, the count initial value register 2 of the corresponding musical tone series
The contents of 0 are set in the corresponding counter 21.

Next, the counter is instructed to count down (step 338). As a result, a countdown is performed every time a count pulse is generated from the pulse generation circuit 23, that is, every time an interrupt occurs.

FIG. 6 is a flowchart showing details of the key release process performed in step S8 and step S23 in FIG.

In the key release process, first, a search for a mute channel is performed (step 541). That is, among the sound generation channels of the musical tone forming circuit 9, a channel corresponding to the released key is searched.

Then, a muting process is performed (step 542).

This is a process for instructing the tone forming circuit 9 to mute.

As a result of the above, the musical sounds emitted from the sound systems 13a and 13b are muted.

When this muting process is completed, an initial value of cents is performed (step 543). This initial value setting process is a process of setting the count initial value at the time of # interruption to the power count initial value register 20. Next, counter set processing is performed (step 544). That is, the contents of the count initial value register 20 of the corresponding tone series are entered into the corresponding counter 21.

Next, the counter is instructed to count down (step 545).

As a result, a countdown is performed every time a count pulse is generated from the pulse generation circuit 23, that is, every time an interrupt occurs.

FIG. 7 is a flowchart showing details of interrupt processing.

This interrupt processing routine is executed by a timer circuit (not shown).
It is activated by an interrupt signal from a pulse generating circuit (corresponding to the pulse generating circuit 23 shown in FIG. 1).

First, as shown in FIG. 7(a), it is checked once whether counting of melody 1 is instructed, that is, whether the first counter of the counter 21 is in operation (step 551). When it is determined that the 8-counter is in operation, a subroutine for processing the count value shown in chest rotation (b) is called (step 552).
.

In this count value processing subroutine, as shown in FIG. 7(b), first, the current count value of the counter is set to rFF.
Check whether it is H (step 571). Then, when it is determined that the count value is rFFMJ,
Returns without performing any processing. That is, the count values rFF, J are special codes that instruct that no countdown is to be performed. This karantoy direct [
FF) IJ is used when producing the sound of an instrument that has a sustained tone, such as an organ.If this code is set, no countdown will be performed, and the contents of the counter will be changed only when the key is released. Be changed.

On the other hand, in step S71, the count value is rFF.
When it was determined that it was not a HJ, Karantoi Nao said “00
□'' is checked once (step 572).

If it is determined that it is not "00□", the content of the counter is decremented (step S73), and this subroutine is returned.

Also, in step S72, the count value is '0'.
If it is determined that the count value is 0++J, the count value is reset (step 574).

That is, the contents set in the count initial value register 20 are set in the corresponding counter 21.

Next, the contents of the display buffer are shifted one bit to the right (step 375), and then the contents of the display buffer are output (step 576). As a result, one of the light emitting elements being displayed is turned off.

The explanation returns to FIG. 7(a). When it is determined in step S51 that counting of melody 1 is not instructed, it is checked whether counting of melody 2 is instructed, that is, whether the second counter of the counter 21 is in operation ( step 553). When it is determined that the counter is in operation, a subroutine for performing count value processing shown in FIG. 2(b) is called (step 554). The operation of this subroutine is the same as the operation described above except for operating the counter corresponding to melody 2, so a description thereof will be omitted.

Thereafter, the chord, bass, and rhythm count instructions are processed in the same manner, and the counters are updated.

To facilitate understanding of the above description, the display device 24
The following describes the status displayed in .

The ninth example shows a display example of the display device 24, and shows an example in which the volumes of each part of melody 1, melody 2, chord, bass, and rhythm are displayed independently. In the figure, a solid line indicates a light emitting element that is lit, and a broken line indicates a light emitting element that is off.

FIG. 10 shows an example of initial count values when displaying the volumes of a piano as a representative of the attenuated tone type and an organ as a representative of the sustained tone type.

In the case of attenuated tones, the initial count value TI when the key is pressed and the initial count value T2 when the key is released are both the same value, for example, 12ON. Therefore, each light emitting element is turned off one by one every time '20HJ time elapses after the key is pressed or released.

For sustained notes, the first value of the count when the key is pressed is T.
l is, for example, rFFH, and the initial count value T2 when the key is released is, for example, "05.l".

rFFH, which is the initial count value when a key is pressed, is a special value as described above, and when this value is set in the counter 21, the counter is not decremented (
(See Figure 7(b)). Therefore, the display device 24, which has been turned on once, continues in that state until the M key is pressed.

On the other hand, the first count when the key is released *JJ (j! The time it takes for the light-emitting element to turn off is also very short, and it appears to turn off instantly.

FIG. 11 shows the relationship between the display state of the display device 24 and the initial count value.

In the case of the attenuated sound type, as shown in FIG. 2(a), a predetermined number of each light emitting element (5 in total in the case shown) of the display device 24 lights up depending on the volume when the key is pressed. Thereafter, each light emitting element is turned off one by one every time T1 elapses, thereby representing the state of attenuation of the attenuated sound.

In the case of a sustained sound type, as shown in FIG. 2(b), a predetermined number of light emitting elements (5 in total in the case shown) of the display device 24 light up depending on the volume when the key is pressed. This state persists until the key is released. After the key is released, the light emitting elements are turned off one by one at a high speed. This expresses how the sustained sound continues.

Next, another embodiment of the storage format of the display time value information will be explained.

Figure 12 shows the data ROM/RAM 5 in this embodiment.
FIG. 2 is a diagram showing a data storage format of FIG.

The envelope information is stored separately from the timbre information, divided into attenuated tones and sustained tones, and the timbre information is configured to include only envelope group information that indicates the envelope information.

Moreover, only one display time value information is provided for one envelope information.

Then, when selecting a tone, that is, when a tone selection operation is performed on the operation panel 3 or a tone change instruction appears in the data read from the automatic performance device 7, and when the count initial value is entered in the count initial value register 20, , select the corresponding envelope information by referring to the envelope group information in the tone information, read out the display time value information in the envelope information, and set it in the count initial value register 20.
to write.

The other configurations and operations are the same as those described above, so their explanations will be omitted.

With this configuration, there is no need to have display time value information for each tone, so it is possible to display time changes in musical tone signal levels that differ between sustained tone and decay tone types with a small ROM capacity. It has become.

Next, still another embodiment will be described. In this embodiment, envelope information provided for each tone color is used as display time information (counter initial value).

FIG. 13 is a diagram showing the storage format of the data ROM/RAM 5 in this embodiment. The difference from the storage format shown in FIG. 3 is that the timbre information does not include display time value information.

FIG. 14 is a main flowchart of the electronic musical instrument in this embodiment.

This main flowchart is a reduced version of the one shown in FIG. 4, so except for different parts, the same reference numerals are given and the explanation will be omitted.

This main flowchart differs from that shown in FIG. 4 in that the process corresponding to step S13 in FIG. 4 is not performed. That is, a tone color is selected from the operation panel 3, and tone color parameters are set based on the selection result (step 512), but at this time, the operation of setting the initial count value in the count initial value register 20 is not performed.

FIG. 15 shows step S6 and step S2 in FIG.
2 is a flowchart showing details of the key press process performed in step 1;

The sound generation process from steps S81 to 384 in FIG. 15 is the same as the process from steps S31 to 334 in FIG. 5, so the explanation will be omitted.

When the above pronunciation processing is completed, the display contents are cleared (
step 585). This display content clearing process is a process for clearing the display buffer.

Here, the display buffer is the same as that shown in FIG.

Next, the display contents are output (step SR6). This is a process of outputting the contents of the display buffer created in step S85 above from the output ports PORTO to 4 of the display control circuit 22 to the display device 24 via the buffer 31. Therefore, immediately after the key is pressed, all the light emitting elements are turned off.

Next, counter set processing is performed (step 587).
. That is, the attack time value included in the envelope information of the corresponding tone series is set in the corresponding counter.

Next, the counter is instructed to count down (step 388).

As a result, a countdown is performed every time a count pulse is generated from the pulse generation circuit 23, that is, every time an interrupt occurs.

FIG. 16 shows step S8 and step S2 in FIG.
3 is a flowchart showing details of the key release process performed in step 3.

In the key release process, first, a search for a mute channel is performed (step 591). That is, among the sound generation channels of the musical tone forming circuit 9, a channel corresponding to the released key is searched.

Then, a muting process is performed (step 592).

This is a process for instructing the tone forming circuit 9 to mute.

As a result of the above, the musical sounds emitted from the sound systems 13a and 13b are muted.

When this muting process is completed, an initial value is set (step 593). This initial value cent process is a process of setting a count value corresponding to the release time value in the envelope information in the count initial value register 20.

Next, counter set processing is performed (step 594).
, that is, the count initial value register 2 of the corresponding musical tone series.
Set the contents of 0 to the corresponding counter.0 then,
Instruct the counter to count down (step 59
5).

As a result, a countdown is performed every time a count pulse is generated from the pulse generation circuit 23, that is, every time an interrupt occurs.

FIG. 17 is a flowchart showing details of interrupt processing.

This interrupt processing routine is activated by an interrupt signal from a timer circuit (corresponding to the pulse generation circuit 23 shown in FIG. 1), not shown.

First, check whether the count of Melody I is instructed or not.
That is, it is checked whether the first counter of the counters 21 is in operation (step 5100). When it is determined that the counter is in operation, a subroutine for processing the count value shown in FIG. 5(b) is called (step 5101).

In this subroutine, as shown in FIG. 17(b),
First, it is checked whether the count value of the counter is roOHJ (step 5ill).

If it is determined that the count value is not '0OIIJ, the contents of the counter are decremented (step 5112), and the present subroutine is returned.

On the other hand, in step 5111 above, the count value is rooM
, it is checked whether the phase of the envelope currently being produced is the attack phase (step 5113).

Then, when it is determined that it is the attack phase,
Reset the count value (step 5114),
That is, the contents set in the count initial value register 20 are set in the corresponding counter 21.

Next, the contents of the display buffer are shifted to the left by one bit (step 5115), and rlJ is set to the lowest bit 0 vacated by this shift operation (step 5116).
), then outputs the contents of the display buffer (step 5117), which causes one of the light emitting elements in display 24 to be illuminated.

On the other hand, if it is determined in step 5113 that the phase is not the attack phase, it is checked whether the phase is the release phase (step 511B).

Then, when it is determined that it is not in the release phase,
It recognizes that it is the Decay phase, and sets the Decay initial value, that is, the contents corresponding to the Decay time, in the count initial value register 20 (step 5119). Furthermore, when it is determined that it is the release phase, Step 5119 is skipped.

Next, the count value is reset (step 51).
20), that is, the contents set in the count initial value register 20 are set in the corresponding counter 21.

Next, the contents of the display buffer are shifted one pinpoint to the right (step 5121), and the process branches to step St17 to output the contents of the display buffer. As a result, the display W24
One of the light emitting elements inside will be turned off.

For the explanation, go back four steps to FIG. is running (step 5102), and
When it is determined that the counter is in operation, the same figure (
A subroutine for performing count value processing shown in b) is called (step 5103). The operation of this subroutine is the same as the operation described above except for operating the counter corresponding to melody 2, so a description thereof will be omitted.

Thereafter, the chord, bass, and rhythm count instructions are processed in the same manner, and the counters are updated.

In this way, using the envelope information, the display device 240
Since lighting or extinguishing is controlled, in addition to displaying sustained/decaying sounds, it is also possible to express a state in which the level of a sound with a slow rise, such as a string sound, increases.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to provide a simple and inexpensive display device for an electronic musical instrument that can display the output signal level of musical tones for each musical tone series regardless of the output series.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the overall configuration of an electronic musical instrument to which the display device of the present invention is applied; FIG. 2 is a block diagram showing the detailed configuration between the display control circuit and the display device of the present invention; The figure is a diagram showing the storage format of data ROM/RAM in an embodiment of the present invention, Figures 4 to 7 are flowcharts showing the operation of an embodiment of the present invention, and Figure 8 is an embodiment of the present invention. FIG. 9 is a diagram showing a display example of a display device according to an embodiment of the present invention; FIG. 10 is a diagram illustrating the initial count value of an embodiment of the present invention. , FIG. 11 is a diagram for explaining the relationship between the display state of the display device and the initial count value of one embodiment of the present invention, and FIG. 12g is another storage format of the data ROM/RAM of one embodiment of the present invention. FIG. 13 shows a data ROM/RAM of another embodiment of the present invention.
Figures 14 to 17 are flowcharts for explaining the operation of other embodiments of the present invention. 5... first storage means (data ROM/RAM), 2
0... Second storage means (count initial value register), 21... Counting means (counter), 22... Control means (display control circuit), 23... Pulse generation circuit, 24... Display means (display device). In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] Display means provided corresponding to a plurality of musical tone series, each comprising a plurality of display elements, and a first storage means for storing lighting time information of the display elements constituting the display means. and a second storage means for reading and storing the lighting time information stored in the first storage means when a tone is selected; and setting the lighting time information stored in the second storage means to an initial value. and a counting means for counting as follows; when generation of a musical tone is instructed, a number of display elements of the display means according to the volume information are turned on, and from then on, the count of the counting means to which the initial value is set is a predetermined value. 1. A display device for an electronic musical instrument, comprising: control means for turning one of the display elements off or on each time the display element reaches .