JPH0830272A - Tempo setting device for electronic musical instrument - Google Patents

Abstract

PURPOSE:To enable changing a present tempo to a desired tempo by a few operation by providing an instruction means instructing a tempo change and changing the present tempo with a prescribed ratio according to the instruction. CONSTITUTION:Functions such as tempo setting and so forth are realized by processings such as tempo switch 142, half-tempo switch 143 and CPU and so forth. That is, in the case a tempo change is instructed with a half-tempo switch 143, a tempo set at the point of the time is changed to a half tempo. Moreover, in the case the tempo change is instructed with a tempo switch 142, the tempo is increased or decreased by one tempo. Thus, since the present tempo is made half by one operation of the half-tempo switch and in this state can be increased or decreased by every one tempo by operating the tempo switch 142, in the case a user is a beginner, a desired tempo is easily set by making the tempo half with one operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tempo setting device for an electronic musical instrument which is applied to an electronic musical instrument having an automatic musical performance function and which sets the tempo of the automatic musical performance.

[0002]

2. Description of the Related Art Conventionally, an electronic musical instrument with an automatic performance function has been developed and put into practical use. Such an electronic musical instrument has a plurality of automatic performance data corresponding to a plurality of rhythms, for example, to enable an automatic performance with a plurality of rhythms. Then, when the operator selects a rhythm and gives an instruction to start the automatic performance, the automatic performance with the selected rhythm is started. This allows the performer to play a melody with automatic accompaniment with a desired rhythm as a background.

The tempo when an electronic musical instrument with the conventional automatic musical performance function as described above is used to perform an automatic musical performance is uniquely determined by the selected rhythm. The initial tempo of each rhythm is called a preset tempo. The preset tempo of each rhythm is determined by setting the preset tempo data included in the automatic performance data in the tempo controller when the rhythm is selected. Usually, as the preset tempo, the optimum tempo for the rhythm is used.

However, there are cases in which it is desired to change the preset tempo depending on the player's sense of the rhythm, the mood during the performance, and the like. In order to meet such demands, after the performer selects a rhythm and starts the automatic performance, the tempo switch provided on the operation panel can be operated to change the tempo to the player's favorite tempo, for example. There is.

[0005]

By the way, the request to change the tempo is not limited to the above case,
It also occurs when a beginner uses the automatic accompaniment function to practice a certain song. The preset tempo is often felt too fast for beginners. In such a case, the beginner has performed the operation of operating the tempo switch every time a rhythm is selected to drop the tempo, and then starts practicing a predetermined piece of music.

The conventional tempo switch is, for example, up / down.
It is composed of a down switch, and the tempo increases by one tempo each time the up switch is pressed, and the tempo decreases by one tempo each time the down switch is pressed. Therefore, when it is desired to reduce the current tempo to half, for example, to reduce the tempo 120 to tempo 60, it is necessary to press the down switch 60 times, which is very troublesome and takes time. . Moreover, if the rhythm selection switch is operated in order to restart the practice from the beginning of the song, the tempo will also return to the preset tempo, and it is necessary to perform an operation to drop the tempo each time, and there is a problem in that it cannot be bothered.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a tempo setting device for an electronic musical instrument, which can change the current tempo to a desired tempo with a small number of operations.

[0008]

In order to achieve the above object, the invention according to claim 1 is an electronic musical instrument having an automatic performance function for generating an automatic performance sound, wherein the tempo of the automatic performance sound is changed. And a first tempo changing means for changing the current tempo at a predetermined rate according to the instruction of the first instruction means.

For the same purpose, the invention according to claim 2 is, in an electronic musical instrument having an automatic performance function for generating an automatic performance sound, a first instruction for instructing a tempo change of the automatic performance sound. Means for changing the current tempo at a predetermined rate in response to an instruction from the first instruction means
The tempo changing means, the second instructing means for instructing to change the tempo of the automatic performance sound, and the second tempo changing means for changing the current tempo by one tempo in response to the instruction of the second instructing means. It is characterized by having and.

For the same purpose, the invention according to claim 3 is the invention according to claim 1 or claim 2, wherein the first tempo changing means halves the current tempo. Characterize.

For the same purpose, the invention according to claim 4 is, in an electronic musical instrument having an automatic performance function for generating an automatic performance sound, a ratio designation for designating a tempo change ratio of the automatic performance sound. Means, a first instructing means for instructing a change in the tempo of the automatic performance sound, and a first changing means for changing the current tempo at a rate designated by the rate designating means in response to an instruction from the first instructing means. And a tempo changing means.

For the same purpose, the invention according to a fifth aspect is an electronic musical instrument having an automatic performance function for generating an automatic performance sound, and a ratio designation for designating a rate of tempo change of the automatic performance sound. Means, a first instructing means for instructing a change in the tempo of the automatic performance sound, and a first changing means for changing the current tempo at a rate designated by the rate designating means in response to an instruction from the first instructing means. Tempo changing means, second instructing means for instructing to change the tempo of the automatic performance sound, and second tempo changing means for changing the current tempo by one tempo in response to the instruction of the second instructing means. Is provided.

Further, for the same purpose, the invention according to claim 6 is the invention according to claim 4 or claim 5, wherein the first tempo changing means halves the current tempo. Characterize.

[0014]

In the tempo setting device for an electronic musical instrument according to claim 1, when the tempo change is instructed by the first instructing means, the tempo set at that time is changed at a predetermined rate. It Therefore, if the rate of changing the tempo is set to, for example, "-50%", the current tempo can be halved with one touch. in this case,
When a beginner uses the automatic accompaniment function to practice a song, the tempo can be lowered with one touch, so that the operation is extremely simple and the practice of the song can be started quickly.

Contrary to the above, if the tempo change rate is set to "+ 50%", for example, the current tempo can be doubled with one touch. Further, the predetermined ratio is not limited to ± 50%, and can be any ratio.

In the tempo setting device for an electronic musical instrument according to a second aspect, when the tempo change is instructed by the first instruction means, the tempo set at that time is changed at a predetermined rate. At the same time, when the tempo change is instructed by the second instruction means, the tempo set at that time is changed by one tempo. Therefore, if the rate of changing the tempo is set to, for example, "-50%", the current tempo can be halved with one touch, and the second instruction means can be operated in that state for each tempo. You can increase or decrease. In this case, if the beginner uses the automatic accompaniment function to practice the song, the tempo can be lowered with one touch,
Since finer adjustments can be made, the operation is extremely simple, and it is possible to quickly start practicing a song and easily set a desired tempo.

In the tempo setting device for an electronic musical instrument according to a third aspect, when there is an instruction from the first instructing means, the current tempo is halved (dropped by 50%) and changed to a so-called half tempo. I have to. Thus, for example, when a beginner is practicing a piece of music using the automatic accompaniment function, it is possible to set the half tempo with one touch, and thus it is possible to provide a tempo setting device having excellent operability.

In the tempo setting device for an electronic musical instrument according to a fourth aspect, when the tempo change is instructed by the first instructing means, the tempo set at that time is specified by the ratio specifying means. Changed in proportion. Therefore, for example, if the rate of tempo change is designated as "-30%" in advance by the rate designating means, the current tempo can be lowered by 30% by one touch by instructing by the first designating means. Therefore, when a beginner is practicing a song using the automatic accompaniment function, if the tempo ratio to be changed is designated in advance by using the ratio designating means, the desired tempo can be set with one touch. You can start practicing songs quickly. The tempo set by the ratio designating means is not limited to the above "-30%", and it goes without saying that the tempo can be set to any ratio.

In the tempo setting device for an electronic musical instrument according to the fifth aspect, when the tempo change is instructed by the first instructing means, the tempo set at that time is specified by the ratio specifying means. When the tempo change is instructed by the second instructing means, the tempo set at that time is changed by one tempo. Accordingly, for example, the rate of tempo change is previously set to "-
If you specify "30%", you can drop the current tempo by 30% with one touch by instructing with the first instructing means, and operate the second instructing means in that state You can increase or decrease by one. Therefore, when a beginner practices a song by using the automatic accompaniment function, if the proportion of tempo to be changed is designated in advance by the proportion designating means, the tempo can be set to a desired tempo vicinity by one touch, and the second tempo can be set.
Since the tempo can be finely changed by using the instruction means of, the tempo setting operation becomes easy and the practice of the song can be started quickly. The tempo set by the ratio designator is
It is needless to say that the ratio is not limited to the above "-30%" and may be any ratio.

In the tempo setting device for an electronic musical instrument according to a sixth aspect, when there is an instruction from the first instructing means, the current tempo is halved (dropped by 50%) and changed to a so-called half tempo. In addition, it is possible to further increase or decrease the halved tempo by one tempo by instructing the tempo change by the second instruction means. Therefore, for example, when a beginner is practicing a song by using the automatic accompaniment function, it is possible to set the half tempo with one touch and set the tempo in the vicinity thereof to a tempo setting device with excellent operability. it can.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the tempo setting device for an electronic musical instrument of the present invention will be described below in detail with reference to the drawings. The tempo setting device of the present invention is configured integrally with an electronic musical instrument having an automatic performance function, and the function of the tempo setting device is mainly based on the processing of the tempo switch 142, the half tempo switch 143 of the operation panel 14 and the CPU 10. Has been realized. Therefore, in the following, the electronic musical instrument as a whole will be briefly described, and the function as the tempo setting device will be described in detail.

(1) First Embodiment FIG. 1 is a block diagram showing a schematic configuration of a first embodiment of an electronic musical instrument to which the tempo setting device of the present invention is applied.

An electronic musical instrument to which the present tempo setting device is applied is a central processing unit (hereinafter referred to as "CPU") 10,
A program memory 11, a random access memory (hereinafter referred to as “RAM”) 12, a panel interface circuit 13, a keyboard interface circuit 15, an automatic performance data memory 17, a waveform memory 18 and a tone generator (tone generator) 19 via a system bus 30. And are connected to each other.

The system bus 30 is, for example, an address line,
It is composed of a data line, a control signal line, etc., and is used for transmitting and receiving various data between the above-mentioned respective constituent elements. The system bus 30 is used by the CPU 10 and the sound source 19 in a time division manner.

The CPU 10 corresponds to the first tempo changing means and the second tempo changing means. The CPU 10 controls the entire electronic musical instrument according to a control program stored in the program memory 11. Details of the operation of the CPU 10 will be described later. In this CPU 10,
A time counter (not shown) is included. This time counter counts up in a cycle according to the tempo. This time counter is used to detect the timing of sound generation or mute in the automatic performance processing described later.

The program memory 11 can be composed of, for example, a read only memory (hereinafter referred to as "ROM"). The program memory 11 stores not only the control program for operating the CPU 10 described above, but also various fixed data used by the CPU 10 for various processes. The contents of the program memory 11 are read by the CPU 10. That is, CPU1
0 reads a control program (command) from the program memory 11 for interpretation / execution and reads predetermined fixed data for use in various processes.

The RAM 12 temporarily stores various data used for executing the control program. Various areas such as a data buffer, a register, a counter, and a flag are defined in the RAM 12. This RAM12 is
It is accessed by the CPU 10.

An operation panel 14 is connected to the panel interface circuit 13. This operation panel 14
It is used to instruct the electronic musical instrument to perform various operations. The operation panel 14 includes a rhythm start switch 140 and a rhythm selection switch 14 as shown in FIG.
1, tempo switch 142, half tempo switch 14
3 and an indicator 144 are provided. It should be noted that the operation panel 14 is provided with various switches and indicators in addition to the above, but these are not directly related to the present invention, and therefore are not shown in FIG.

The rhythm start switch 140 is used to instruct the start or stop of the automatic performance. The rhythm start switch 140 is alternately switched on and off each time it is pressed. Whether the rhythm start switch is in the on state or the off state depends on the RAM 1
It is stored as the "automatic performance flag" defined in 2.

The rhythm selection switch 141 is composed of a plurality of switches corresponding to a plurality of rhythms such as 8-beat, waltz, samba, etc. A rhythm is selected by pressing any one of the rhythm selection switches 141. The rhythm selected by the rhythm selection switch 141 is stored as a rhythm number in the “rhythm buffer” defined in the RAM 12.

The tempo switch 142 corresponds to the second instruction means. The tempo switch 142 includes a tempo up switch 142A and a tempo down switch 1
And 42B. The tempo value is controlled to increase by 1 each time the tempo up switch 142A is pressed, and the tempo value is decreased by 1 each time the tempo down switch 142B is pressed. The data input using the tempo switch 142 is the RAM 1
It is stored in the "tempo buffer" defined in 2. The tempo switch 142 can also be configured by a numeric keypad, a slide type operator, a rotary type operator, etc. In these cases, the tempo value does not change by ± 1 but the desired tempo value is directly input. To be done.

The half tempo switch 143 corresponds to the first instructing means. This half tempo switch 143
Used to indicate that the current tempo should be cut in half. For example, when the half tempo switch 143 is pressed while the automatic performance is being performed at the tempo 120, the tempo is changed to 60.

The display 144 is, for example, a 7-segment L
The ED display is provided for two digits. The display 144 displays numbers, English characters, etc. according to the data sent from the CPU 10. For example, when the rhythm selection switch 141 is operated, the rhythm number of the rhythm corresponding to the pressed switch is displayed. When the tempo switch 142 is operated, the tempo value corresponding to the operation is displayed.

In the first embodiment, as the display unit 144, a display unit in which a 7-segment LED is composed of two digits is illustrated, but the display unit 144 is not limited to this. For example,
The display 144 has a 7-segment LED for one digit or 3 digits.
It may be configured to have more than one digit, or may be configured using an LCD display or a CRT capable of displaying characters and numbers,
Furthermore, it can be configured using various other display devices.

The panel interface circuit 13 controls transmission / reception of data between the operation panel 14 and the CPU 10. That is, the panel interface circuit 13 sends a scan signal to the operation panel 14, and inputs a signal indicating ON / OFF of each switch returned from the operation panel 14 in response to the scan signal. Then, from this signal, panel data in which ON / OFF of each switch is associated with 1 bit is generated and sent to the CPU 10. This panel data is stored in the RAM 12 by the CPU 10 and used to determine the presence or absence of a panel event (details will be described later).

Further, the panel interface circuit 13 is
The display data sent from the CPU 10 is sent to the operation panel 14. As a result, a predetermined number or English character is displayed on the display 144.

A keyboard device 16 is connected to the keyboard interface circuit 15. The keyboard device 16 has a plurality of keys for indicating a pitch. As the keyboard device 16, for example, a two-contact type keyboard device is used, and it is possible to detect the initial touch data as well as turning the key on / off. That is, each key of the keyboard device 16 has two key switches that are turned on / off by a key pressing operation or a key releasing operation, and each key switch is turned on / off at different pressing depths.

The keyboard interface circuit 15 controls transmission / reception of data between the keyboard device 16 and the CPU 10. Specifically, the keyboard interface circuit 15 includes the keyboard device 1
6, a scan signal is sent to 6 and a signal indicating the on / off state of the key switch is sent back from the keyboard device 16 in response to this scan signal. Then, from the received signal, key data in which ON / OFF of each key is associated with 1 bit and initial touch data indicating the speed (strength) of key depression are generated and sent to the CPU 10. The key data is used to determine the presence / absence of a keyboard event.
The initial touch data is used to control the volume and timbre.

The automatic performance data memory 17 is, for example, RO
It can be composed of M. The automatic performance data memory 17 stores automatic performance data corresponding to a plurality of rhythms. The automatic performance data corresponding to one rhythm is composed of a header section and an automatic performance data section as shown in FIG. 6, for example. The header section stores the number of repeated measures data, the time signature data, and the preset tempo data of the rhythm. The preset tempo data is tempo data that provides an optimum tempo for automatic performance with the rhythm, and the preset tempo of the rhythm is determined by the preset tempo data. Further, the automatic performance data section stores automatic performance data for designating sound generation / silence.

Although not shown in detail, the automatic performance data of each rhythm includes, for example, 3 chords, bass and drums.
It is composed of data for generating one part sound. The automatic performance data of each part is created in the same format as MIDI data, for example, and includes step time data for instructing sounding timing. The automatic performance data stored in the automatic performance data memory 17 is converted into a format that can be processed by the tone generator 19 and sent to the tone generator 19 in an automatic performance process described later.

The automatic performance data may be stored in a part of the RAM 12 instead of the automatic performance data memory 17. In this case, for example, a floppy disk device (or ROM card controller) is connected to the system bus 30, and a floppy disk (or R
The automatic performance data is stored in an OM card), and each of the above data is read from a floppy disk (or a ROM card inserted in a ROM card controller) loaded in the floppy disk device when the electronic musical instrument is powered on.
It may be configured to be loaded into the AM 12. According to this structure, there is an advantage that many kinds of automatic performances can be performed.

The waveform memory 18 stores pulse code modulated (PCM) waveform data. The waveform memory 18 stores a plurality of types of waveform data corresponding to each tone color (musical instrument sound), each tone range (key range), key depression speed, etc. in order to realize a plurality of tone colors.

The sound source 19 includes, for example, a plurality of oscillators. Then, one to several oscillators are assigned to each tone generation channel that generates the tone of each part. The oscillator corresponding to the channel to which the sound is assigned reads the waveform data stored in the waveform memory 18 and adds an envelope to the waveform data to generate a digital tone signal. To read the above waveform data, use C
The PU 10 and the sound source 19 are time-shared using the system bus 30. The digital musical tone signal generated by the sound source 19 is sent to the D / A converter 20.

The D / A converter 20 converts the input digital musical tone signal into an analog musical tone signal and outputs it. The analog tone signal output from the D / A converter 20 is sent to the amplifier 21. The amplifier 21 amplifies the input analog musical tone signal with a predetermined amplification factor and outputs it. The analog tone signal output from the amplifier 21 is the speaker 2
Sent to 2. The speaker 22 is a well-known one that converts an analog musical tone signal as an electric signal into an acoustic signal.
The speaker 22 emits a musical sound according to the key operation of the keyboard device 16 or the automatic performance data read from the automatic performance data memory 17.

In the first embodiment, the rhythm selection switch 141 is composed of a plurality of switches provided for each rhythm.
Similar to the above-described item 2, it may be configured by an up / down switch including an up switch “+” and a down switch “−”, or a numeric keypad.

When the rhythm selection switch 141 is composed of an up-down switch, the rhythm selection switch and the tempo switch 142 may be shared. In this case, the tempo switch 142 is defined as a general-purpose switch, and a mode switching switch for switching the operation mode of this general-purpose switch is separately provided. And
When the tempo setting mode is set with this mode selector switch, the general-purpose switch is used to set the tempo,
When the rhythm selection mode is set by the mode changeover switch, it is used to select the rhythm number.

Further, by operating the mode changeover switch to a mode other than the above, for example, a tone color selection mode, a sound effect selection mode, or a volume setting mode, they respectively operate as a tone color selection switch, a sound effect selection switch, or a volume setting switch. It is also possible to configure so as to allow it. When operating as a timbre selection switch, it is used to select one timbre from a plurality of timbres, and when operating as a sound effect selection switch, one sonic effect (for example, reverb) is selected from a plurality of sonic effects. It is used to specify, and when operating as a volume setting switch, it is used to increase or decrease the volume value. According to such a configuration, there is an advantage that the number of switches can be reduced.

Next, the operation of the electronic musical instrument to which the tempo setting device according to the present invention is applied in the above configuration will be described with reference to the drawings, focusing on the operation as the tempo setting device.

3 to 5 are flow charts showing the operation of the first embodiment of the tempo setting device according to the present invention. In the first embodiment, by pressing the half tempo switch 143, the tempo of the automatic performance is reduced to half the tempo set at that time. Hereinafter, the operation for realizing the above function will be described in detail.

FIG. 3 is a flow chart showing the main routine of the electronic musical instrument to which the tempo setting device of the present invention is applied, which is started by turning on the power. When the power is turned on, first, initialization processing is performed (step S10).
The initialization process is a process of setting the internal state of the CPU 10 to the initial state and setting initial values to the registers, counters, flags, etc. defined in the RAM 12. Further, in this initialization process, a process of sending predetermined data to the sound source 19 and preventing an unnecessary sound from being generated when the power is turned on is performed. When this initialization process ends,
Next, switch event processing is performed (step S1).
1). The details of this switch event process are shown in the flowchart of FIG.

In the switch event process, first, a panel scan is performed (step S20). This is performed as follows. That is, the CPU 10 sends a scan command to the panel interface circuit 13. As a result, the panel interface circuit 13 generates panel data by the method described above and sends it to the CPU 10.
The CPU 10 stores this panel data (hereinafter referred to as “new panel data”) in a predetermined area of the RAM 12.
Next, the panel data that has been previously read and already stored in the RAM 12 (hereinafter referred to as "old panel data").
And the above new panel data are compared to create a panel event map in which different bits are turned on. The presence / absence of a switch event is determined by referring to this panel event map.

When the panel scan process is completed, it is then checked whether or not there is a panel event (step S).
21). That is, it is checked if there is more than one bit turned on in the panel event map.
If it is determined here that there is no switch event, that is, if there is no bit that is turned on in the panel event map, the switch event processing routine returns and returns to the main routine. . On the other hand, if it is determined in step S21 that there is a switch event, then it is checked whether or not the switch event is the event of the rhythm selection switch 141 (step S22). This is performed by checking whether or not the bit corresponding to each switch of the rhythm selection switch 141 in the panel event map is turned on.

Here, if it is determined that the event is the event of the rhythm selection switch 141, rhythm change processing is performed (step S23). In this rhythm changing process, the rhythm number corresponding to the pressed switch in the rhythm selection switch 141 is stored in the rhythm buffer. The rhythm number stored in this rhythm buffer is used to specify the automatic performance data to be read in the automatic performance processing. Further, the rhythm number stored in the rhythm buffer is sent to the panel interface circuit 13.
As a result, the rhythm number corresponding to the selected rhythm is displayed on the display 144.

In the rhythm changing process, the preset tempo data included in the header portion of the automatic performance data corresponding to the selected rhythm is stored in the tempo buffer. Then, the preset tempo data stored in the tempo buffer is sent to the control unit of the time counter in order to determine the count-up period of the time counter. As a result, the time counter counts up in a cycle according to the preset tempo data. Therefore, the automatic performance sound generated by the automatic performance process has a preset tempo in the initial state (a state in which the tempo switch 142 or the half tempo switch 143 is not operated). After that, the process returns from this switch event processing routine and returns to the main routine.

If it is determined in step S21 that the event is not the rhythm selection switch 141, then
It is checked whether the event is the tempo switch 142 (step S24). This is performed by checking whether or not the bit corresponding to the tempo up switch 142A or the tempo down switch 142B in the panel event map is turned on.

If it is determined that the event is the tempo switch 142 event, a tempo change process is performed (step S25). In this tempo change process, first,
Whether the tempo up switch 142A is an on event is checked, and if it is determined that the tempo up switch 142A is an on event, the content of the tempo buffer is incremented (+1). Next, it is checked whether the tempo down switch 142B is an on event, and if it is determined that the tempo down switch 142B is an on event, the contents of the tempo buffer are decremented (-1). When the contents of the tempo buffer are changed in this way, the contents of the tempo buffer are sent to the control unit of the time counter, as described above. As a result, the time counter counts up in a cycle according to the changed tempo data. Therefore, the automatic performance sound generated by the automatic performance processing has a tempo according to the changed tempo data. After that, the process returns from this switch event processing routine and returns to the main routine.

In step S24, the tempo switch 14
If it is determined that the event is not the event of No. 2, then it is checked whether it is the event of the half tempo switch 143 (step S26). This is done by checking whether the bit corresponding to the half tempo switch 143 in the panel event map is on.

If it is determined that the event is the half tempo switch 143, the half tempo process is performed (step S27). In this half tempo process, the contents of the tempo buffer are halved. Then, the contents of the tempo buffer are sent to the control unit of the time counter, as described above. As a result, the time counter counts up at a cycle corresponding to the halved tempo data. Therefore, the automatic performance sound generated by the automatic performance processing has a tempo that is half the tempo set at that time. After that, the process returns from this switch event processing routine and returns to the main routine.

If it is determined in step S26 that the event is not the half tempo switch 143, then it is checked whether or not there is an event of the rhythm start switch 140 (step S28). This is the rhythm start switch 140 in the panel event map.
By checking if the bit corresponding to is turned on.

When it is determined that there is an event of the rhythm start switch 140, the automatic performance flag is reversed (step S29). That is, if the automatic performance flag is set to "1" and the automatic performance mode is set,
It is cleared to "0" and the normal performance mode is entered. Conversely, if the automatic performance flag is cleared to "0" and the normal performance mode is set, it is set to "1" and the automatic performance mode is entered. As a result, the rhythm start switch 140
A toggle function is realized in which the automatic performance mode and the normal performance mode are alternately repeated each time is pressed. After that, the process returns from this switch event processing routine and returns to the main routine.

If it is determined in step S28 that the rhythm start switch 140 is not the event, then the other switches are processed (step S30). By this "other switch processing", for example, the tone color number corresponding to the event of the tone color selection switch is stored in the tone color buffer defined in the RAM 12.
In addition, the sound effect number and the sound volume value are R respectively corresponding to each event of the sound effect selection switch and the sound volume setting switch.
It is stored in the sound effect buffer and the volume buffer defined in AM12. Although processing for various other switch events is performed, each processing is not directly related to the present invention, and therefore description thereof is omitted. When this "other switch process" is completed, the process returns from this switch event process routine and returns to the main routine.

In the main routine, keyboard event processing is then performed (step S12). In this keyboard event process, the presence or absence of a keyboard event is first checked.
This is performed as follows. That is, by scanning the keyboard device 16 with the keyboard interface circuit 15, data indicating the pressed state of each key (hereinafter referred to as “new key data”) is fetched as a bit string corresponding to each key.

Then, the data previously read and already stored in the RAM 12 (hereinafter referred to as "old key data") is compared with the above new key data to check whether or not there is a different bit. Create a key event map with the different bits turned on. The presence / absence of a keyboard event is determined by referring to this key event map. That is, if there is even one bit that is turned on in the key event map, it is determined that there is a keyboard event.

If it is determined that there is a keyboard event by referring to the key event map created above, keyboard event processing is performed. In the keyboard event processing, sound generation processing is performed when it is determined that there is a key on event. In this sound generation process, a predetermined oscillator in the sound source 19 is assigned to the melody part (specific sound generation channel).

Next, the key number of the key having the on event, the initial touch data indicating the strength (speed) of key depression, and the tone color number (stored in the tone color buffer) selected at that time, etc. Based on, for example, waveform address, frequency data, envelope data,
Filter coefficients and the like are generated and sent to the sound source 19. As a result, the oscillator to which the tone generator 19 is assigned produces tone sounds based on the above data. On the other hand, when it is determined in the keyboard event process that there is a key off event, the mute process is performed. More specifically, the oscillator in the sound source 19 assigned to the key having the off event is searched for, and predetermined data is sent to the sound source 19 to mute the sound.

When this keyboard event process is completed, an automatic performance process is then carried out (step S13). The details of this automatic performance process are shown in the flowchart of FIG.

In the automatic performance process, it is first checked whether or not the automatic performance flag is "1" (step S4).
0). When it is determined that the automatic performance flag is not "1", that is, the normal performance mode is set, step S
The process returns from the automatic performance processing routine to the main routine without performing the processing of 31 and below.

On the other hand, when it is determined that the automatic performance flag is "1", that is, the automatic performance mode is set, it is checked whether or not it is the processing timing of the automatic performance (step S).
41). That is, one piece of automatic performance data is read from the automatic performance data memory 17, and the step time included in the automatic performance data is compared with the time value counted up by a time counter (not shown).

If it is determined that the comparison results do not match, it is recognized that the sounding or mute timing has not been reached yet, and the process returns from this automatic performance processing routine without performing the processing of step S42 and thereafter. Then return to the main routine. In this case, when the automatic performance processing routine is called next time, the same automatic performance data is read and it is checked whether or not the processing timing has come.

On the other hand, when it is determined that the above comparison results match and the processing timing is reached, it is recognized that the sounding or mute timing has come, and then the automatic performance data read from the automatic performance data memory 17 is read. Is the note-on data (step S4).
2). Then, if it is determined that the data is note-on data, a sounding process is performed (step S43). In the tone generation processing, for example, a waveform address, frequency data, envelope data, filter coefficient, etc. are generated based on the note-on data, the tone color number set in the tone color buffer at that time, and the like and sent to the tone generator 19. Subsequent operations are the same as the sound generation processing in the above-mentioned keyboard event processing, so description thereof will be omitted. After that, the routine returns from this automatic performance processing routine and returns to the main routine.

If it is determined in step S42 that the data is not note-on data, then other processing is performed (step S44). In this "other processing",
It includes mute processing based on note-off data, automatic performance end processing (or repetitive execution processing) based on end mark data, timbre change processing, volume change processing, etc., but description thereof is omitted because it is not directly related to the present invention. . When this "other processing" ends, the automatic performance processing routine returns and returns to the main routine.

In the main routine, other processing is then performed (step S14). The "other processing" includes MIDI data transmission / reception processing performed via a MIDI interface circuit (not shown). After that, the process returns to step S11, and the same processing is repeated thereafter. In the process of repeatedly executing steps S11 to S14, when an event based on a panel operation or a keyboard operation occurs, the process corresponding to the event is performed, so that various functions as an electronic musical instrument are exhibited.

As described above, according to the first embodiment, when the tempo change is instructed by the half tempo switch 143, the tempo set at that time is changed to half the tempo. When the tempo switch 142 instructs to change the tempo, the tempo set at that time is increased or decreased by one tempo. Therefore, the current tempo can be halved by one-touching the half tempo switch 143, and the tempo switch 142 can be operated in that state to increase or decrease the tempo one by one. Therefore, when a beginner uses the automatic accompaniment function to practice a song. The tempo can be halved with one touch, and the tempo switch can be used to make fine adjustments, so you can easily set the tempo to your liking with extremely simple operations. Therefore, even when the automatic performance is restarted from the beginning, it is possible to quickly start practicing the music.

(2) Second Embodiment In the second embodiment, by pressing the half tempo switch 143, not only the tempo of the automatic performance is lowered to half the tempo set at that time, but also the tempo is lowered. It is made possible to select. The configuration and operation for realizing the above functions will be described in detail below.

FIG. 7 is a diagram showing the configuration of the operation panel applied to the second embodiment. In addition to the configuration of the operation panel used in the first embodiment, this operation panel has a ratio selection switch 145.
Is different in that it is provided. The same components as those of the operation panel (FIG. 2) of the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

The ratio selection switch 145 corresponds to ratio specifying means. This ratio selection switch 145
It is composed of a plurality of push button switches, for example, and the rate at which the tempo should be changed is determined for each. For example, "-50
The "%" switch is used to instruct to decrease the tempo by 50% when the half tempo switch 143 is pressed, and similarly, the "-30%" switch sets the tempo to 3%.
Used to instruct to drop 0%, as well as
The "± 0%" switch is used to instruct not to change the tempo, and similarly, the "+ 50%" switch is used to instruct to increase the tempo by 50%. The rate (%) for changing the tempo described above is not limited to the exemplified one, and any value can be used.
Data indicating the rate of tempo change selected by the rate selection switch 145 (hereinafter referred to as "rate data").
Are stored in the “ratio buffer” of the RAM 12.

In the second embodiment, the ratio selection switch 145 is exemplified by a plurality of switches provided for each ratio value. However, like the tempo switch 142, the up switch "+" is used. Down switch "-"
It is also possible to configure with an up-down switch consisting of, or a numeric keypad.

When the ratio selection switch 145 is composed of an up / down switch, the ratio selection switch 145 and the tempo switch 142 may be shared. In this case, the tempo switch 142 is defined as a general-purpose switch, and a mode switching switch for switching the operation mode of this general-purpose switch is separately provided. When the tempo setting mode is set by the mode changeover switch, the general-purpose switch is used for setting the tempo, and when the proportion selection mode is set by the mode changeover switch, the tempo change ratio is selected. Configure to be used. According to such a configuration, there is an advantage that the number of switches can be reduced.

The operation for realizing the above functions will be described in detail below. In the second embodiment, since the main routine (FIG. 3) and the automatic performance processing routine (FIG. 5) used in the first embodiment are used as they are, the description thereof will be omitted.

The switch event processing routine of the second embodiment is used by partially modifying the switch event processing routine (FIG. 4) of the first embodiment as shown in FIG. Specifically, the content of the process of step S27 is different from that of the first embodiment, and steps S28A and S29A are added to the process steps of the first embodiment.
Since the other steps have already been described with reference to FIG. 4, description thereof will be omitted (the same steps are denoted by the same reference numerals).

In the flowchart of FIG. 8, processing is sequentially performed from step S20, and if it is determined in step S28 that the event is not the rhythm start switch 140, then it is checked whether or not the event is the ratio selection switch 145. (Step S28A). This is the ratio selection switch 145 in the panel event map.
This is done by checking whether or not the bit corresponding to each switch is turned on.

If it is determined that the event is the ratio selection switch 145, a ratio changing process is performed (step S29A). In this ratio changing process, the ratio data corresponding to the pressed switch in the ratio selection switch 145 is stored in the ratio buffer. The ratio data stored in the ratio buffer is used when the tempo is changed in the half tempo process (step S27).
Further, the ratio data stored in the ratio buffer is sent to the panel interface circuit 13. Thereby, the data corresponding to the selected ratio is displayed on the display 144. After that, the process returns from this switch event processing routine and returns to the main routine. On the other hand, “other processing” (step S30) performed when the event is not the event of the ratio selection switch 145 is the same as that in the first embodiment.

The ratio data (contents of the ratio buffer) changed as described above is referred to when the half tempo switch 143 is subsequently operated. That is, if it is determined in step S24 that there is an event of the half tempo switch 143, half tempo processing is performed (step S27A). In this half tempo processing, the contents of the tempo buffer are changed according to the contents of the ratio buffer. For example, if the contents of the tempo buffer is “tempo = 1
20 "and the content of the ratio buffer is" -2.
If it is set to "0%", the content of the tempo buffer is changed to "tempo = 84". Then, the contents of the tempo buffer are sent to the control unit of the time counter, as described above. As a result, the time counter displays "tempo =
It is counted up in a cycle according to "84". Therefore,
The automatic performance sound generated by the automatic performance processing has a tempo of 70% of the tempo set at that time, that is, "tempo = 84". After that, the process returns from this switch event processing routine and returns to the main routine.

As described above, according to the second embodiment, when the tempo change is instructed by the half tempo switch 143, the tempo set at that time is the rate specified by the rate selection switch 145. Will be changed in. When the tempo switch 142 instructs to change the tempo, the tempo set at that time is increased or decreased by one tempo. Therefore, for example, the ratio selection switch 145
If the rate of tempo change is designated as "-30%" in advance, the current tempo can be lowered by 30% with one touch by pressing the half tempo switch 143. Further, in that state, the tempo switch 142 can be operated to increase / decrease the tempo one by one. Therefore, when a beginner practices the music by using the automatic accompaniment function, the proportion of the tempo to be changed is designated by using the proportion selection switch 145. By doing so, the tempo can be set near the desired tempo with one touch, and the tempo can be finely changed by using the tempo switch 142, so that the tempo setting operation becomes simple and the practice of the song can be started quickly.

In the first and second embodiments, the case where the tempo is changed from the operation panel 14 by using the half tempo switch 143 has been described. However, the tempo change data included in the automatic performance data or the external The same can be applied to the case where the tempo is changed by the tempo change data included in the MIDI data transmitted from.

[0086]

As described in detail above, according to the present invention,
A tempo setting device for an electronic musical instrument that can change the current tempo to a desired tempo with a few operations can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an electronic musical instrument to which a tempo setting device commonly used in Examples 1 and 2 of the present invention is applied.

FIG. 2 is a diagram showing an example of an operation panel used in the first embodiment of the present invention.

FIG. 3 is a flowchart (main routine) showing an operation common to the first and second embodiments of the present invention.

FIG. 4 is a flowchart (switch event processing routine) showing the operation of the first embodiment of the present invention.

FIG. 5 is a flowchart (automatic performance processing routine) showing an operation common to the first and second embodiments of the present invention.

FIG. 6 is a diagram showing an example of automatic performance data commonly used in the first and second embodiments of the present invention.

FIG. 7 is a diagram showing an example of an operation panel used in Example 2 of the present invention.

FIG. 8 is a flowchart (switch event processing routine) showing the operation of the second exemplary embodiment of the present invention.

[Explanation of symbols]

 10 CPU 11 Program Memory 12 RAM 13 Panel Interface Circuit 14 Operation Panel 15 Keyboard Interface Circuit 16 Keyboard Device 17 Automatic Performance Data Memory 18 Waveform Memory 19 Sound Source 20 D / A Converter 21 Amplifier 22 Speaker 30 System Bus 140 Rhythm Start Switch 141 Rhythm Selection switch 142 Tempo switch 142A Tempo up switch 142B Tempo down switch 143 Half tempo switch 144 Indicator 145 Ratio selection switch

Claims (6)

[Claims] 1. An electronic musical instrument having an automatic performance function for generating an automatic performance sound, comprising: a first instruction means for instructing a tempo change of the automatic performance sound; and an instruction from the first instruction means. A tempo setting device for an electronic musical instrument, comprising: a first tempo changing means for changing the current tempo at a predetermined rate. 2. An electronic musical instrument having an automatic performance function for generating an automatic performance sound, comprising: a first instruction means for instructing a tempo change of the automatic performance sound; and an instruction of the first instruction means. A first tempo changing means for changing the current tempo at a predetermined rate, a second instructing means for instructing to change the tempo of the automatic performance sound, and a current in accordance with an instruction of the second instructing means. A tempo setting device for an electronic musical instrument, comprising: a second tempo changing means for changing only one tempo. 3. The tempo setting device for an electronic musical instrument according to claim 1, wherein the first tempo changing means halves the current tempo. 4. An electronic musical instrument having an automatic performance function for generating an automatic performance sound, a ratio designating unit for designating a rate of change of the tempo of the automatic performance sound, and a command for changing the tempo of the automatic performance sound. An electronic device comprising: a first instruction means; and a first tempo changing means for changing the current tempo at a rate designated by the rate designating means in response to an instruction from the first instruction means. Instrument tempo setting device. 5. An electronic musical instrument having an automatic performance function for generating an automatic performance sound, a ratio designating unit for designating a rate of tempo change of the automatic performance sound, and a command for changing the tempo of the automatic performance sound. 1 instructing means, 1st tempo changing means for changing the current tempo according to the instruction of the 1st instructing means at a rate designated by the rate designating means, and instructing to change the tempo of the automatic performance sound And a second tempo changing means for changing the current tempo by one tempo according to the instruction of the second indicating means. . 6. The tempo setting device for an electronic musical instrument according to claim 4 or 5, wherein the first tempo changing means halves the current tempo.