JPH0876760A - Tempo speed controller of automatic playing device - Google Patents

Abstract

PURPOSE: To speedily set a musical performance to a target tempo speed irrelevantly to the current tempo speed by providing a varying means which varies the current tempo speed at a specific rate according to the displacement of a tempo operation element. CONSTITUTION: A CPU corresponds to the varying means and an operation continuation detecting means. When an up/down switch 133 which can be operated to both the plus and minus sides is operated, its plus or minus displacement is detected and the current tempo speed is varied at the specific rate according to the displacement. Then a center position as a nonoperation position is given and when a wheel 155 which can be operated in both the plus and minus directions is operated, its plus or minus displacement is detected, so that the current speed is varied at the specific rate according to the displacement quantity. Further, when the continuation of the operation is detected by operating the up/down switch 133 or wheel 155 for longer than a specific time, the current tempo speed is varied at the specific rate at specific intervals of time throughout the operation period.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tempo speed control device for an automatic performance device which controls the tempo speed during recording or reproduction in the automatic performance device.

[0002]

2. Description of the Related Art Conventionally, performance information generated according to the operation of a keyboard or an operation panel is stored (recorded) in a memory, and
There is known an automatic performance device which reads out and reproduces the performance information stored in this memory. In such an automatic performance device, normally, the tempo speed at the time of recording or reproducing can be changed by manual operation. Such a tempo speed changing function is performed by the tempo speed control device provided in the automatic performance device. The tempo speed control device includes, for example, a tempo register that stores data that defines the tempo speed (hereinafter referred to as “tempo speed value”), and a tempo operator that changes the tempo speed, such as an up / down switch or an incrementer. And a tempo speed control unit that changes the tempo speed by changing the contents of the tempo register according to the operation of the tempo operator.

In such a conventional tempo speed control device, the current tempo speed (hereinafter referred to as "current tempo speed") is determined according to the number of times the tempo operator is operated, for example, the number of times the up / down switch is pressed. A new tempo speed (hereinafter referred to as "new tempo speed") is set by increasing or decreasing the current tempo speed value that defines Now, if the tempo operator is operated N times,
The new tempo speed value that defines the new tempo speed is expressed by the following equation. New tempo speed value = current tempo speed value ± N (1)

In such a conventional tempo speed control device, in order to reduce the tempo speed from, for example, tempo 80 to tempo 60, the tempo operator may be operated 20 times. However, in order to lower the tempo from 160 to 120, it is necessary to operate the tempo operator 40 times. That is, the current tempo speed is 3/4
If you want to lower it to 2 depending on the current tempo speed
There was a problem that the difference in the amount of operation doubled.

Further, in order to speed up the tempo speed change, the amount of change by one operation of the tempo operator is set to 2
Double or triple or more, that is, the one using "2N" instead of "N" in the above formula (1), or "3".
Those using "N" or more have also been developed. However, when the performer tries to increase or decrease the tempo speed at a predetermined rate, there remains a problem that the operation amount of the tempo operator greatly differs depending on the current tempo speed.

On the other hand, if the tempo operator is continuously operated for a certain period of time (for example, 0.5 seconds), the tempo speed is automatically set at a predetermined time interval as long as the tempo operator is continuously operated. A tempo speed control device having a function of incrementally incrementing or decrementing (hereinafter referred to as "auto increment function") has also been developed. This auto increment function is basically
A constant value is added to or subtracted from the current tempo speed value at predetermined time intervals. Furthermore, as a modification of this auto-increment function, for example, the tempo speed can be changed rapidly by shortening the time interval for gradually incrementing or decrementing according to the time the tempo operator has been operating. Control devices have also been developed.

[0007]

However, in the above-mentioned conventional tempo speed control devices, the tempo speed is controlled by a parameter that is irrelevant to the current tempo speed.
It is intended to speed up.

When changing the tempo speed, the performer wants to reduce the current tempo speed by half or 3/4, or by increasing it to double or 4/3, etc. I have a request to change. However, in the conventional tempo speed control device, the tempo speed change processing is performed regardless of the current tempo speed, so if you want to increase or decrease the tempo speed at the same rate, the number of operations of the operator will increase depending on the current tempo speed. There was a problem that it was different and very inconvenient.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an automatic performance device having excellent operability capable of quickly setting a target tempo speed regardless of the current tempo speed. To provide a tempo speed control device.

[0010]

In order to achieve the first object, the invention according to claim 1 is an automatic performance device for recording or reproducing performance information at a predetermined tempo speed. A tempo manipulator for instructing a change, a displacement detecting means for detecting a displacement when the tempo manipulator is operated, and a current tempo speed according to the displacement of the tempo manipulator detected by the displacement detecting means. Changing means for changing at a predetermined ratio.

For the same purpose, in the invention according to claim 2, the tempo operator can be operated bidirectionally between a positive side and a negative side, and the displacement detecting means is provided for the tempo operator. It is characterized by detecting a positive displacement or a negative displacement.

Further, for the same purpose, in the invention according to claim 3, the changing means sets the current tempo speed value to a predetermined index according to the displacement of the tempo operator detected by the displacement detecting means. It is characterized by changing according to a function.

Further, for the same purpose, in the invention according to claim 4, the tempo operator has a specific non-operating position, and multi-steps are performed in both positive and negative sides with respect to the non-operating position. Is output, and the changing unit changes the current tempo speed according to the amount of displacement of the tempo operator detected by the displacement detecting unit.

Further, for the same purpose, the invention according to claim 5 is an operation continuation detecting means for detecting that the operation is being continued when the tempo operator has been operated for a predetermined time or more, and a predetermined time. Timing changing means for generating tempo change timing at intervals, and the changing means,
While the operation continuation unit detects that the operation is being continued, at each tempo change timing generated by the timing generation unit, depending on the displacement of the tempo operator detected by the displacement detection unit. It is characterized by changing the current tempo speed at a predetermined rate.

For the same purpose, the invention according to claim 6 is an automatic performance device for recording or reproducing performance information at a predetermined tempo speed, and a tempo operator for instructing a change of tempo speed, Displacement detecting means for detecting displacement when the tempo operator is operated, operation continuation detecting means for detecting that the tempo operator is continuing operation when the tempo operator has been operated for a predetermined time or more, and continuation of the operation While the detection means detects that the operation is being continued, the timing generation means for generating the tempo change timing at a time interval corresponding to the tempo speed, and the tempo change timing generated by the timing generation means, Changing means for changing the current tempo speed at a predetermined rate according to the displacement of the tempo operator detected by the displacement detecting means, And wherein the door.

For the same purpose, the invention according to claim 7 is configured such that the timing generating means is configured to generate a tempo change timing whose generation interval is shortened or lengthened in proportion to the tempo speed. Characterize.

Further, for the same purpose, in the invention according to claim 8, the tempo operator has a specific non-operating position, and there are multiple stages in both positive and negative sides with respect to the non-operating position. And the changing means is configured to change the current tempo speed according to the displacement amount of the tempo operator detected by the displacement detecting means at each tempo change timing. To do.

[0018]

According to the first aspect of the invention, in the automatic performance device for recording or reproducing the performance information at a predetermined tempo speed, when the tempo operator is operated, its displacement is detected by the displacement detecting means. The changing means changes the current tempo speed at a predetermined rate according to the displacement detected by the displacement detecting means.

The changing means calculates the new tempo speed value, for example, by performing the calculation shown in the following equation. New tempo speed value = current tempo speed value × (1.00 ± M) (2) Here, M is a predetermined constant, for example, 0 ≦ M
Values of ≦ 1.00 can be used.

According to the second aspect of the invention, as the tempo operator, an operator that can be operated bidirectionally between the positive side and the negative side is adopted. When the tempo operator is operated, a positive or negative displacement is detected by the displacement detecting means. The changing means increases or decreases the current tempo speed at a predetermined rate according to the detected positive or negative displacement.

More specifically, when a positive displacement is detected, "+ M" is used as "± M" in the above formula (2), and when a negative displacement is detected, the above (2 "-M" is used as M in the equation). As a result, the current tempo speed can be bidirectionally increased or decreased at a predetermined rate according to the operation of the tempo operator.

According to the third aspect of the invention, the changing means sets the current tempo speed value according to the function as shown in the equation (2) each time the displacement detecting means detects the displacement of the tempo operator. Repeat the process of changing. This causes the tempo speed to increase or decrease exponentially. Such an exponential change in tempo speed is in accordance with the human sense, and the tempo change is not unnatural, resulting in excellent operability.

The fractional part after the decimal point generated by the calculation of the above equation (2) can be rounded up, rounded down or rounded down to obtain the new tempo speed value. Also, only the integer part obtained by rounding up, rounding down or rounding down the fractional part after the decimal point generated by the calculation of the above formula (2) is adopted as the tempo speed value, and the calculation result including the decimal point is for the next calculation. It can also be configured to remain.

The value of M in the above equation (2) is preferably about 0.02, for example. When M = 0.02, the tempo speed changes as follows each time the tempo operator is pressed. In this example, a part of the variable range of the tempo speed is obtained by rounding off the decimal point based on the equation (2). No. tempo No. tempo No. tempo No. tempo No. tempo No. tempo 1: 180 21: 148 31: 120 41: 100 51:80 61:67 2: 176 22: 145 32: 118 42: 98 52: 78 62:66 3: 172 23: 142 33: 116 43: 96 53:76 63:65 4: 169 24: 139 34: 114 44: 94 54:74 64:64 5: 166 25: 136 35: 112 45 : 92 55:73 65:63 6: 163 26: 133 36: 110 46:90 56:72 66:62 7: 160 27: 130 37: 108 47: 88 57:71 67:61 8: 1157 28: 127 38: 106 48:86 58:70 68:60 9: 154 29: 124 39: 104 49:84 59:69 69:59 10: 151 30: 122 40: 102 50:82 60:68 70:58

In this way, the new tempo speed is calculated by multiplying the current tempo speed by the predetermined coefficient "(1.00 ± M)". Therefore, if the current tempo speed is high, one operation of the tempo operator is performed. The proportion of the tempo speed changed with is large, and conversely, the proportion is small if the current tempo speed is small. Therefore, the influence of the current tempo speed on the number of times the tempo operator should be operated is reduced, and the target tempo speed can be quickly approached.

Compared with the example shown in the section of the prior art,
Drop tempo 160 to tempo 120 (set to 3/4)
In this case, the number of times the panel operator is operated is 24 times, and when the tempo 80 is reduced to tempo 60 (set to 3/4),
The number of operations of the panel operator is 17 times. in this way,
In the conventional tempo speed control device, there is a difference of 20 times in the number of operations of the panel operator, but according to the present invention,
You only need to make a difference.

The new tempo speed value is (2) above.
It is also possible to store a table in which the current tempo speed value and the new tempo speed value are associated with each other in advance in the storage means instead of performing a function operation using an expression or the like, and refer to this table to obtain the table. it can. With this configuration, it is possible to realize a complicated change in tempo speed that cannot be represented by a function. The point is that the configuration is such that the new tempo speed value can be obtained in consideration of the current tempo speed.

Further, in the invention described in claim 4,
A tempo operator having a specific non-operation position and capable of outputting multi-stage displacement amounts in both positive and negative sides with respect to the non-operation position, for example, an operation element used for a modulation wheel or the like is adopted. are doing. Then, a value corresponding to the displacement amount output from the tempo operator is used as the value of M in the above equation (2). At this time, the tempo operator is a positive displacement amount (“+ M”) when operated to the positive side with respect to the non-operating position, and a negative displacement amount (“−M”) when operated to the negative side. Is output. The changing unit changes the current tempo speed in accordance with the displacement amount of the tempo operator detected by the displacement detecting unit, for example, according to the above equation (2).

With this configuration, the current tempo speed can be greatly changed by one operation of the tempo operator. For example, if a value of “+0.10” is output as the displacement amount by operating the tempo operator, the tempo speed can be increased by 10%. Similarly, if a value of "-0.50" is output as the displacement amount, it is possible to halve the tempo speed with one operation of the tempo operator. As described above, according to the present invention, the current tempo speed can be greatly changed according to the operation amount of the tempo operator, and the target tempo speed can be reached quickly.

Further, in the invention described in claim 5,
The auto increment function is realized. That is, when it is detected that the tempo operator has been operated for a predetermined time or more and the operation is being continued, each tempo generated at a constant time interval is detected while the operation is being continued. At the change timing, the current tempo speed is changed at a predetermined rate according to the displacement of the tempo operator detected by the displacement detecting means.

As described above, the tempo speed can be automatically increased or decreased by continuously operating the tempo operator, so that there is an advantage that the tempo setting operation becomes simple and quick. Moreover, if the current tempo speed is high, the proportion of tempo speeds updated at regular time intervals is large, and conversely, if the current tempo speed is small, the proportion is small. Therefore, the influence of the current tempo speed on the time during which the tempo operator continues to operate is reduced, and the tempo speed can be brought close to the target tempo speed by changing the tempo speed according to the human sense.

A more specific description will be given. As a tempo operator, for example, a positive displacement amount (“+ M”) when operated to a positive side with respect to a non-operating position such as a wheel, and a negative displacement amount (“−M” when operated to a negative side). ]) Will be described. This tempo operator has
A rate R as shown in FIG. 2B, for example, is assigned corresponding to the rotational position. Then, the rate R selected by operating the tempo operator is
It is used as the value of M in the above equation (2). When a predetermined rate R is selected by this tempo operator and the state is kept for a predetermined time (for example, 0.5 seconds), the calculation of the above formula (2) is performed at regular time intervals, for example, every 0.1 second. Repeated.

For example, if "0.10" is selected as the rate R by the tempo operator, and if it takes n seconds to double the tempo speed, the following equation is established. (1.01) ⁿ = 2 (3) Therefore, n = log2 / log1.01 = 0.3010 / (0.4321 × 10 ^-2 ) = 69.6 That is, tempo speed after 6.96 seconds. Doubles.

Similarly, when "0.30" is selected as the rate R by the tempo operator, assuming that it takes n seconds to double the tempo speed, the following formula is established. (1.01) ⁿ = 2 (4) Therefore, n = log2 / log1.03 = 0.3010 / (0.1283 × 10 ^-1 ) = 23.4, that is, the tempo speed after 2.34 seconds. Doubles.

As described above, the tempo speed can be changed over an arbitrary time period according to the operation amount of the tempo operator. For example, operations such as halving the tempo speed in one measure or doubling the tempo speed in about four measures are possible. In the inventions described in claims 1 to 5, the tempo speed may not be updated in increments of ± 1, and in such a case, it may not be possible to match the desired tempo speed. . To cope with such a case, a tempo operator for changing the tempo speed in increments of ± 1 is provided separately, or the tempo operator is controlled to operate in increments of ± 1 when set to a specific mode. By adding the configuration described above, it is possible to provide a tempo speed control device having more excellent operability.

According to the invention of claim 6,
In an automatic performance device that records or reproduces performance information at a predetermined tempo speed, the displacement detection means detects the displacement when the tempo operator is operated, and the tempo operator is continuously operated for a predetermined time or longer. At each tempo change timing generated at a time interval corresponding to the tempo speed, the current tempo speed is changed according to the displacement of the tempo operator detected by the displacement detecting means.

For example, if the tempo operator is kept pressed for a predetermined time (for example, 0.5 seconds), the tempo change timing is generated at a time interval corresponding to the tempo speed set at that time. Then, at each tempo change timing, the current tempo speed is automatically changed according to the displacement of the tempo operator detected by the displacement detecting means. This change can be realized, for example, by the calculation of the above-mentioned formula (1). In this case, if a manipulator that can be displaced in both the positive and negative directions is used as the tempo manipulator, a value of ± M can be obtained, and the current tempo speed can be increased or decreased.

As described above, the tempo speed can be automatically increased or decreased by continuously operating the tempo operator, which has the advantage of simplifying the tempo setting operation. Moreover, the timing for changing the tempo speed is determined according to the tempo speed set at that time, so if the current tempo speed is large, the tempo change timing will occur at close intervals, and conversely, the current tempo speed will change. If it is small, the tempo change timing generation interval becomes coarse. Therefore, the influence of the current tempo speed on the time required for changing the tempo is small.

Further, in the invention described in claim 7,
The tempo change timing is controlled to be short or long in proportion to the tempo speed. This makes it possible to approach the target tempo speed in a substantially constant time regardless of the current tempo speed.

Further, in the invention described in claim 8,
A tempo operator having a specific non-operation position and capable of outputting multi-stage displacement amounts in both positive and negative sides with respect to the non-operation position, for example, an operation element used for a modulation wheel or the like is adopted. are doing. Then, a value corresponding to the amount of displacement output from the tempo operator is used as the value of M in the above equation (1). At this time, the tempo operator is a positive displacement amount (“+ M”) when operated to the positive side with respect to the non-operating position, and a negative displacement amount (“−M”) when operated to the negative side. Is output. The changing means changes the current tempo speed in accordance with the displacement amount of the tempo operator detected by the displacement detecting means, for example, according to the above equation (1).

With this configuration, 1 according to the above equation (1)
The amount of tempo speed changed by one calculation can be arbitrarily set, and the time to reach the target tempo speed can be arbitrarily adjusted.

[0042]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a tempo speed control device for an automatic performance device of the present invention will be described in detail below with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing the structure of an automatic performance device to which the tempo speed control device of embodiment 1 of the present invention is applied. The automatic performance device to which this tempo speed control device is applied is a central processing unit (hereinafter,
It is called "CPU". ) 10, read only memory (hereinafter referred to as "ROM") 11, random access memory (hereinafter referred to as "RAM") 12, operation panel 1
3, tone generator 14, timer A16, timer B20, M
It has an IDI controller 17 and an FD controller 18, and these elements are mutually connected by a system bus 30. The system bus 30 is composed of, for example, an address line, a data line, a control signal line, etc., and is used for transmitting and receiving various data between the above-mentioned respective elements.

The CPU 10 corresponds to changing means and operation continuation detecting means. The CPU 10 controls the entire electronic musical instrument to which the present tempo speed control device is applied according to a control program stored in the ROM 11. This C
The PU10 has three interrupt signal input terminals INT1 and IN.
T2 and INT3 are provided. An interrupt signal is supplied from the MIDI controller 17 to the interrupt signal input terminal INT1, from the timer A16 to the interrupt signal input terminal INT2, and from the timer B20 to the interrupt signal input terminal INT3. Details of the operation of the CPU 10 will be described later.

The ROM 11 stores a control program for operating the CPU 10 described above, various fixed data used by the CPU 10 for various processes, and the like. Also,
The conversion table shown in FIG. 15, for example, is stored in the ROM 11 (details of the conversion table will be described later). The contents of the ROM 11 are read by the CPU 10. That is, the CPU 10 performs various functions by reading a control program (command) from the ROM 11 to interpret and execute the program, and reads predetermined fixed data for use in various processes.

The RAM 12 temporarily stores various data used by the CPU 10. In the RAM 12, various areas such as a buffer, a register, a counter, and a flag are defined. Specific buffers, registers, counters, flags, and the like used in this embodiment will be described each time they appear below, but here, the "reception buffer" and "bar register and beat register" will be described.

Reception Buffer The reception buffer is used to temporarily store MIDI data received from the MIDI controller 17 described later. This reception buffer is, for example, as shown in FIG. 14A, a counter CTR defined in the RAM 12,
The CPU 1 comprises a pointer PTR and a storage area.
With the control of 0, it operates as a FIFO (first-in-first-out) memory. The storage area has, for example, 256 entries, and MIDI data is sequentially stored in each entry.

The counter CTR designates the position of the storage area in which the received MIDI data should be written. This counter CTR is controlled so as to always indicate the next address of the last written MIDI data. The initial value of the counter CTR is "0", and is incremented every time MIDI data is written. If the result exceeds the maximum value TOP, the counter CTR circulates to the minimum value BTM.

The pointer PTR indicates the position of the MIDI data to be read in the storage area. The pointer PTR is always controlled so as to indicate the address next to the MIDI data read last, that is, the address of the MIDI data to be read next. This pointer P
The initial value of TR is "0" and is incremented every time MIDI data is read, and the result is the maximum value TO.
When P is exceeded, the value is circulated to the minimum value BTM.

This reception buffer is judged to be empty when the contents of the counter CTR and the contents of the pointer PTR match. As a result of incrementing the counter CTR, the content of the counter CTR is changed to the pointer P.
When the contents of TR are matched, the reception buffer is full, so that the reception of MIDI data is controlled. If the contents of the counter CTR and the contents of the pointer PTR do not match, it is determined that MIDI data exists in the reception buffer.

Writing of MIDI data to the receiving buffer is performed by a MIDI-IN interrupt processing routine described later, and reading of MIDI data from the receiving buffer is performed by a MIDI-IN processing routine described later. In the present embodiment, the reception buffer is formed in the RAM 12, and MIDI data writing / reading is controlled by the CPU.
Although it is configured so as to be performed in 10, it is also possible to use a well-known FIFO memory element instead of these.

Bar Register and Beat Register The bar register BRR is a register for counting the progress of bars. This bar register BRR is capable of counting equivalent to four decimal digits. The beat register BTR is a register for counting the progress of beats within a bar. The beat register BTR is counted up every step time. In this embodiment, one beat has a resolution of 48 steps. Therefore, the beat register BTR is 4 when the beat is 4
After counting the beats, that is, 192 steps, round to zero. At this time, the bar register BRR is controlled to be incremented.

The RAM 12 stores the above-mentioned buffers, registers, etc., and also stores automatic performance data (hereinafter referred to as "pattern data"). The pattern data is used to generate a performance pattern of, for example, 2 to 16 measures. The pattern data is composed of a 4-byte data set such as a step time, a note number (key code), a gate time, and a velocity as shown in FIG. Each pattern data corresponds to one note. Here, the step time specifies the time at which the sound generation starts, and is defined by the number of steps from the beginning of the bar. The note number is used to specify the pitch. The gate time is used to define the pronunciation time. Velocity is used to specify the strength (volume) of pronunciation.

Returning to the description of FIG. On the operation panel 13,
Various switches, a display and the like are provided for communication between the tempo speed control device and the operator. Details of the operation panel 13 will be described later.

The tone generator 14 generates a tone signal based on the data sent from the CPU 10 via the system bus 30. The musical tone signal generated by the musical tone generator 14 is sent to the speaker system 15.
The speaker system 15 is composed of, for example, an amplifier, a speaker and the like, and is a well-known system which converts a musical tone signal sent from the musical tone generator 14 into an acoustic signal and emits the acoustic signal.

The timer A16 generates an interrupt signal at time intervals corresponding to the tempo. The interval of this interrupt signal is
It is determined by the data (preset value) set in the timer A16 from the CPU 10. The interrupt signal generated by the timer A16 is the interrupt signal input terminal IN of the CPU 10.
Supplied to T2. In this embodiment, the quarter note is 1/48
Since the control is performed with the resolution (accuracy) of, the interrupt signal is generated 48 times per quarter note.

The timer B20 generates an interrupt signal at a constant time interval (0.1 second interval in this embodiment). The generation interval of this interrupt signal is fixed by hardware, for example. In the present embodiment, the interval at which the interrupt signal is generated is 0.1 second, but the interval is not limited to this and any value can be used. The interrupt signal generated by the timer B20 is the interrupt signal input terminal IN of the CPU 10.
It is supplied to T3.

The MIDI controller 17 controls the transfer of MIDI data between an external device and an automatic performance device to which the present tempo speed control device is applied. This MIDI
Examples of the external device connected to the outside of the controller 17 include an electronic musical instrument capable of processing MIDI data, a tone generator module, a computer, a sequencer, and the like. The MIDI controller 17 receives the MIDI data serially sent from the external device, and generates an interrupt signal when the MIDI data reaches one byte, for example. This interrupt signal is an interrupt signal input terminal I of the CPU 10.
Supplied to NT1.

The FD controller 18 controls the floppy disk drive device 19. The floppy disk mounted in the floppy disk drive device 19 stores, for example, pattern data. Then, by operating a predetermined switch (not shown) provided on the operation panel 13, the pattern data recorded on the floppy disk is loaded into a predetermined area of the RAM 12 via the FD controller 18.

FIG. 2A is a diagram showing a configuration example of the operation panel 13 of the automatic performance device to which the present tempo speed control device is applied. The bar / beat display 130 is, for example, a 5-digit 7
It is composed of segment LED displays. This measure /
The upper four digits of the beat indicator 130 show the "bar" that is currently being automatically played, that is, the contents of the bar register BRR, and the lower one digit is the "beat" that is currently being played, that is, the beat register BTR. Beat corresponding to the content of (specifically,
In the case of 4 beats, a value obtained by adding 1 to the quotient obtained by dividing the contents of the beat register BTR by 48) is displayed. The display contents of the bar / beat display 130 are sequentially updated as the automatic performance progresses.

The code display 131 is composed of, for example, an LCD display. The code display 131 displays the code (code root and code type) detected by the code detection processing performed in the MIDI-IN processing (step S15) of the main routine described later.
In this embodiment, MIDI channel 1 (MIDI-CH
It is assumed that the MIDI data sent in 1) is regarded as the data from the lower key, and code detection is performed on this. Therefore, the code display 131 has M
The code detected based on the MIDI data sent from IDI channel 1 is displayed. The chord detection is not limited to the performance data sent from the MIDI channel 1, but may be configured to target the performance data sent from any other MIDI channel or a plurality of MIDI channels. good.

The tempo speed indicator 132 is, for example, 3
It consists of a 7-segment LED display unit. The tempo speed display 132 displays the currently set tempo speed. The currently set tempo speed value is stored in the tempo register provided in the RAM 12.

Although the bar / beat display 130 and the tempo speed display 132 are composed of 7-segment LED displays, they can be composed of LCD displays, CRT displays, and other various displays. . Similarly, the code display 131 is not limited to the LCD display, and can be configured with a CRT display or other various displays.

The up / down switch 133 corresponds to a tempo operator and is used to set / change the tempo. The up / down switch 133 includes an up switch 133A and a down switch 133B. The current tempo speed is increased each time the up switch 133A is pressed, and the current tempo speed is decreased each time the down switch 133B is pressed. When the tempo speed is changed by the up / down switch 133, the contents of the tempo register are changed and the changed tempo speed is displayed on the tempo speed display 132.

The change in tempo speed due to the depression of the up / down switch 133 will be described. When either the up switch 133A or the down switch 133B is pressed and the event is detected, the new tempo speed value is calculated by the above equation (2).
As described above, M in the equation (2) is 0 ≦ M.
A constant in the range of ≦ 1.00 can be used. When the up switch 133A is pressed, "+ M" is adopted as M, and when the down switch 133B is pressed, "-M" is adopted. Generally, M is "0.02"
A value of the degree can be adopted.

As the new tempo speed value, a table in which the correspondence between the current tempo speed value and the new tempo speed value is stored in advance is stored in the storage means without using the function calculation as described above. It can also be configured to refer to. In this case, the table is ROM
11 can be formed. With this configuration, it is possible to realize a complicated change in tempo speed that cannot be represented by a function.

Also, the up / down switch 133
Is also used to implement the auto increment function. That is, if the up switch 133A is continuously pressed for a predetermined time (for example, 0.5 seconds) or more, the tempo speed value is automatically incremented. Similarly, if the down switch 133B is continuously pressed for a predetermined time (for example, 0.5 seconds) or more, the tempo speed value is automatically decremented. The increment or decrement of the tempo speed value is realized, for example, by performing the calculation of the above formula (2) in a timer B interrupt processing routine which will be described later and is called at intervals of 0.1 seconds.

The wheel 155 corresponds to the tempo operator and is used to set the tempo. As the wheel 155, for example, the same operator as that used as a modulation wheel in an ordinary electronic musical instrument as shown in FIG. 2B can be used. That is, the wheel 155 is rotatable in the vertical direction according to the operation of the player, and is configured to return to a fixed position (center position) by the action of a spring, for example, when not operated, and depending on the rotational position. It is a device that outputs a positive or negative multi-step value. That is, the wheel 155
Is composed of a potentiometer that outputs a voltage according to the rotational position, and this voltage is converted into digital data by an A / D converter (not shown) and is stored as wheel data in the CPU.
Supplied to 10.

The change in tempo speed associated with the operation of the wheel 155 will be described below. This wheel 15
A rate R as shown in FIG. 2B, for example, is assigned to 5 corresponding to the rotational position. Then, the rate R selected by operating the wheel 155 is used as M in the above equation (2). When a predetermined rate R is selected by the wheel 155, the calculation of the above formula (2) is performed and the new tempo speed is changed.

The wheel 155 is also used to realize the auto increment function. That is,
The tempo speed value is automatically incremented or decremented when the wheel 155 is fixed at a specific position for a predetermined time (for example, 0.5 seconds) or longer. Wheel 1 determines whether to increment or decrement.
Depending on which direction 55 was rotated. That is, when the position is fixed at the positive rate R, the increment is performed, and when the position is fixed at the negative rate R, the decrement is performed. This rate R is used as the value of M in the above equation (2). The increment or decrement of the tempo speed value is realized, for example, by performing the calculation of the above formula (2) in a timer B interrupt processing routine which will be described later and is called at 0.1 second intervals.

Returning to the description of the operation panel 13. Figure 2 (A)
In, the stop switch 134 is used to stop the automatic performance. That is, when the stop switch 134 is pressed during the automatic performance, the automatic performance is stopped. The play / pause switch 135 is used to start or pause the automatic performance. When the play / pause switch 135 is pressed while the automatic performance is stopped or in the pause (pause) state, the LED display 14
3 is turned on to start or restart the automatic performance, and when pressed during the automatic performance, the LED display 143 is turned off and the pause state is set.

The FF switch 136 is used for increasing the tempo speed for reproduction. That is, when the FF switch 136 is pressed during the automatic performance, the LED display 144 is turned on to perform high-speed reproduction, and when the FF switch 136 is pressed next time, the LED display 144 is turned off and the original tempo speed is restored. R
The EW switch 137 is used to return the reproduction position. That is, when the REW switch 137 is pressed, L
The ED display 145 is turned on and the bar / beat rate decreases (rewinds). This rewind state is the measure / beat indicator 1
You can check at 30. R again in the rewind state
When the EW switch 137 is pressed, the LED indicator 145 is turned off and the reproduction of the automatic performance is restarted.

The repeat switch 138 is used for automatically playing a song repeatedly. That is, when the repeat switch 138 is pressed before the automatic performance is started, the LED display 146 is turned on, and when the automatic performance is performed up to the end of the music, the operation returns to the beginning and the automatic performance of the same music is repeated. When the repeat switch 138 is pressed again in this state, the LED indicator 146 is turned off and the repeated playback state of the automatic performance is released. The repeat switch 138 is operated by performing a predetermined operation during automatic performance.
It is also used to repeatedly reproduce a specific section of a piece of music, but description thereof is omitted here.

The part 1 switch 139 is used to instruct the pronunciation of the rhythm part. When the part 1 switch 139 is pressed, the LED indicator 147 is turned on and the rhythm part is sounded. When the part 1 switch 139 is pressed next, the LED indicator 147 is turned off and the sound of the rhythm part is stopped. Similarly, the part 2 switch 140 is used to instruct the pronunciation of the bass part. When the part 2 switch 140 is pressed, the LED indicator 148 is turned on to sound the base part, and when it is pressed next time, the LED indicator 148 is turned off and the sound of the base part is stopped.

Similarly, the part 3 switch 141 is used to instruct the pronunciation of the accompaniment part (eg, chord part). This part 3 switch 14
When 1 is pressed, the LED indicator 149 is turned on and the accompaniment part is sounded, and when it is pressed next, the LED indicator 149 is turned off and the sound of the accompaniment part is stopped. Similarly, the part 4 switch 142 is used to indicate the melody part. When the part 4 switch 142 is pressed, the LED indicator 150 is turned on and the melody part is sounded.
The ED display 150 is turned off and the sound of the melody part is stopped.

Of the above parts, the rhythm part, the bass part, and the accompaniment part are sounded by repeatedly executing pattern data of about 1 to several measures, and the melody part is all pattern data for one song. Is read out in sequence and is sounded.

On the operation panel 13, a tone color selection operator for selecting a desired tone color from a plurality of tone colors other than the above, a volume operator for adjusting the volume, and an operation for loading data from the floppy disk into the RAM 12. Although a child and the like are provided, they are not directly related to the present invention, and therefore illustration and description thereof are omitted.

The setting states of the switches and the like of the operation panel 13 configured as described above are read by the CPU 10 as follows. That is, the CPU 10 sends a scan command to the operation panel 13. In response to the scan command, the operation panel 13 sends a signal indicating ON / OFF of each switch and a signal indicating the current value of the wheel 155 to the CPU 1.
Send to 0. The CPU 10 generates panel data (consisting of switch data in which ON / OFF of each switch corresponds to 1 bit and wheel data indicating a set value of the wheel 155) from the received signal. This panel data is stored in the RAM 12 under the control of the CPU 10 and is used to determine the presence / absence of a panel event (details will be described later).

Next, the operation of the first embodiment of the automatic performance device to which the tempo speed control device of the present invention is applied is shown in FIG.
~ It will be described in detail with reference to the flowchart shown in FIG.

(1) Main Processing (FIG. 3) FIG. 3 is a flow chart showing the main routine of the embodiment of the automatic performance device to which the tempo speed control 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 S1).
0). In this initialization processing, the internal state of the CPU 10 is set to the initial state, and the initial values are set to the registers, counters, flags, etc. defined in the RAM 12.

When this initialization process is completed, a panel switch scan process is then performed (step S1).
1). That is, the CPU 10 sends a scan command to the operation panel 13. As a result, the operation panel 13
As described above, the panel data is generated, and the CPU 10
Send to 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 (hereinafter referred to as “old panel data”) read in the previous panel switch scan processing and already stored in the RAM 12 is compared with the new panel data, and the panel in which the different bit is turned on is turned on. Create an event map.

Then, the presence or absence of an event is checked (step S12). This is done by referring to the panel event map above. That is, it is checked whether or not there is at least one bit that is turned on in the panel event map, and if there is no bit, there is no event, and if there is at least one bit, there is an event. Each is judged. If it is determined in step S12 that there is an event, panel control processing is performed (step S13), and if not, panel control processing is skipped. Details of this panel control processing will be described later.

Then, the received data (MI
It is checked whether or not there is DI data (step S).
14). This is done by checking whether the contents of the counter CTR and the contents of the pointer PTR match as described above. If it is determined that there is received data in the receive buffer, MIDI-IN processing is performed (step S15), and if not, MIDI-IN is performed.
Processing is skipped.

In the MIDI-IN processing, processing is performed on the MIDI data input from the MIDI controller 17 and stored in the reception buffer. That is, MI
In the DI-IN process, first, one M
IDI message is retrieved and the MID contained in it
It is checked whether the I channel number is "1", that is, whether it is the data of the lower key. When it is determined that the channel number is not "1", the MID
Normal tone generation processing is performed according to the I data.

On the other hand, when it is determined that the channel number is "1", that is, the data is the lower key data, the code detection processing is performed to detect the code type and the code root. The chord type and chord root detected here are sent to the chord indicator 131 and displayed. Then, the pattern data read from the RAM 12 is expanded in accordance with the chord type and chord root detected by the chord detection processing, and musical tone data of chord constituent tones are created. This tone data is sent to the tone generator 14. The tone generator 14 generates a tone signal, and the tone signal is supplied to the speaker system 15 to start the generation of an automatic performance tone.

Then, the reading processing of parts 1 to 4 is executed (step S16). This process is a process of reproducing the musical sound by reading the pattern data of each part from the RAM 12. The outline of the read processing of parts 1 to 4 is as follows. That is, first, the pattern data of parts 1 to 4 are sequentially read from the RAM 12. Then, the step time included in the pattern data is checked, and it is checked whether or not the pattern data reaches the sound generation timing. Then, when it is determined that the tone generation timing is reached, the pattern data is developed according to the chord detected above, and the musical tone data of the chord composing tone is generated. This tone data is sent to the tone generator 14 as described above. The tone generator 14 generates a tone signal, and the tone signal is supplied to the speaker system 15 to start the generation of an automatic performance tone.

Then, "other processing" is performed (step S17). In this "other processing", floppy disk control, tone color selection processing, volume setting processing and the like are performed, but since they are not directly related to the present invention, description thereof will be omitted. Then, the process returns to step S11, and the same process is repeated thereafter. By repeating the above steps S11 to S17, the operation of the operation panel 13 and MIDI
Various processes associated with the reception of data are executed, and various functions as an automatic performance device are realized.

(2) MIDI-IN interrupt processing (FIG. 4) This MIDI-IN interrupt processing is executed by interrupting the processing of the main routine. In this MIDI-IN interrupt processing, the MIDI received by the MIDI controller 17
The data is stored in the receive buffer. The MIDI controller 17 is an MI that is serially sent from an external device.
When the DI data reaches 1 byte, an interrupt signal is generated.
This interrupt signal is an interrupt signal input terminal INT1 of the CPU 10.
Is supplied to. As a result, the CPU 10 enters the interrupt mode, and this MIDI-IN interrupt processing routine is called.

In the MIDI-IN interrupt processing, first, MI
MIDI data is read from the DI controller 17 and written in the position indicated by the counter CTR of the reception buffer (step S20). Then, the counter CTR is incremented (step S21), and it is checked whether the result exceeds the maximum value TOP of the storage area (step S22). And the maximum value TOP
If the MIDI-IN is judged not to exceed
Return from the processing routine and return to the position interrupted by the main routine. On the other hand, when it is determined in step S22 that the maximum value TOP is exceeded, the contents of the counter CTR are rewritten to the minimum value BTM (step S2).
3) After that, the routine returns from this MIDI-IN processing routine and returns to the position interrupted by the main routine.
As a result, the function of a circular buffer that makes a round from the maximum value TOP to the minimum value BTM is realized.

Although not shown in the figure, when the result of incrementing the counter CTR exceeds the value of the pointer PTR, the reception buffer is full, and therefore the MIDI data fetching process is suppressed. .

(3) Panel Control Processing (FIG. 5) Next, details of the panel control processing performed in step S13 of the main routine will be described with reference to the flowchart of FIG.

This panel control processing routine is called when it is determined in the main routine that an event such as a panel switch has occurred. In the panel control process, it is first checked whether or not there is an event of the up / down switch 133 (step S30). This is done by checking whether the bit corresponding to the up switch 133A or the down switch 133B in the panel event map is "1". If it is determined here that there is an event of the up switch 133A or the down switch 133B, tempo speed processing 1 is performed (step S31), and if not, tempo speed processing 1
Is skipped. Details of the tempo speed processing 1 will be described later. The process of step S30 corresponds to the displacement detecting means.

Then, it is checked whether or not there is an event of the wheel 155 (step S32). That is, the wheel data in the old and new panel data is compared, and if they are different, it is determined that there is an event of the wheel 155. In this step S32, the wheel 155
If it is determined that there is an event, the tempo speed processing 2 is performed (step S33), and if not, the tempo speed processing 2 is skipped. Details of the tempo speed processing 2 will be described later. This step S3
The process 2 corresponds to the displacement detecting means.

Then, it is checked whether or not there is an event of the stop switch 134 (step S34). This is the stop switch 13 in the panel event map.
This is done by checking whether the bit corresponding to 4 is "1". If it is determined that there is an event of the stop switch 134, the stop process is performed (step S35), and if not, the stop process is skipped. In the stop processing, the automatic performance flag defined in the RAM 12 is cleared to "0". As a result, in the timer A interrupt process (FIG. 8) described later, updating of the bar register BRR and the beat register BTR is suppressed, the progress of the automatic performance is stopped, and the sound generation of each part is stopped.

Then, it is checked whether or not there is an event of the play / pause switch 135 (step S3).
6). This is done by checking whether the bit corresponding to the play / pause switch 135 in the panel event map is "1". If it is determined that there is an event of the play / pause switch 135, the play process is performed (step S37), and if not, the play process is skipped. In the play process, when the automatic performance flag is "0", that is, when the play / pause switch 135 is pressed while the automatic performance is stopped, the automatic performance flag is set to "1" and LE is set.
The D display 143 is turned on. As a result, the bar register BRR and the beat register BTR are started to be updated in the timer A interrupt process (FIG. 8) described later, and the automatic performance is advanced. On the contrary, when the automatic performance flag is "1", that is, when it is determined that the play / pause switch 135 is pressed during the automatic performance, the automatic performance flag is cleared to "0" and the LED indicator 143 is turned off. To be done. This allows
The same processing as when the stop switch 134 is pressed is performed to stop the sound generation of each part.

Then, it is checked whether or not there is an event of the FF switch 136 (step S38). This is done by checking whether the bit corresponding to the FF switch 136 in the panel event map is "1". If it is determined that there is an event of the FF switch 136, FF processing is performed (step S3).
9), otherwise FF processing is skipped. FF
In the processing, when it is determined that the FF flag defined in the RAM 12 is "0", that is, the FF switch 136 is pressed during the normal reproduction, the FF flag is set to "1", and the predetermined data is stored in the timer A16. When set, the LED indicator 144 is turned on. As a result, the tempo speed is increased and high speed reproduction is performed. vice versa,
When the FF flag is "1", that is, when it is determined that the FF switch 136 is pressed during high-speed reproduction, the FF flag is cleared to "0", the original data is restored to the timer A16, and the LED display is displayed. 144 is turned off.
This returns to the tempo speed before the FF switch 136 was pressed.

Then, it is checked whether there is an event of the REW switch 137 (step S40). This is done by checking whether the bit corresponding to the REW switch 137 in the panel event map is "1". If it is determined that there is an event of the REW switch 137, the REW processing is performed (step S41), and if not, the REW processing is skipped. In the REW process, the REW flag defined in the RAM 12 is “0”, that is, the REW switch 13 is set during the normal reproduction.
When it is determined that 7 is pressed, the REW flag is "1".
And the measure register B defined in the RAM 12
The RR and the beat register BTR are decremented at a predetermined speed, the result is sent to the bar / beat display 130, and the LED display 145 is turned on. As a result, the display of the bar / beat display 130 is decremented, and the automatic performance sequence is moved backward. Note that sound generation is stopped during this REW processing. Conversely, the FF flag is "1",
That is, when it is determined that the REW switch 137 is pressed during the high speed reproduction, the REW flag is cleared to “0”,
The LED indicator 145 is turned off. As a result, the automatic performance is restarted from the reduced positions of the bar register BRR and the beat register BTR.

Then, it is checked whether or not there is an event of the repeat switch 138 (step S42). This is the repeat switch 13 in the panel event map.
This is done by checking whether the bit corresponding to 8 is "1". If it is determined that there is an event of the repeat switch 138, the repeat process is performed (step S43), and if not, the repeat process is skipped. In the repeat process, if the repeat flag defined in the RAM 12 is “0”, the repeat flag is set to “1” and the LED indicator 146 is turned on. On the contrary, if the repeat flag is “1”, the repeat flag is cleared to “0” and the LED indicator 145
Is turned off. As a result, although not shown in detail, if the repeat flag is "1" when the reading of the pattern data for one music is completed, the automatic performance sequence returns to the beginning of the music and the same automatic performance is repeated. To be executed. On the other hand, if the repeat flag is "0", the automatic performance is stopped.

Then, it is checked whether or not there is an event of the part switches 139 to 142 (step S4).
4). This is done by checking whether the bits corresponding to the part switches 139 to 142 in the panel event map are "1". If it is determined that there is an event of the part switch 139 to 142, the part 1 to 4 switching process is performed (step S45), and if not, the part 1 to 4 switching process is skipped.

The parts 1 to 4 switching process is a process of starting or stopping the sounding of the part when the part switch 139 to 142 is pressed. In the automatic performance device to which the tempo speed control device according to the present embodiment is applied, the pattern data of parts 1 to 4 are always read, and it is determined whether or not a sound is produced based on the read pattern data. It is determined by whether the switches 139 to 142 are turned on.

Therefore, in this part 1 to 4 switching process,
A process for controlling whether or not to send the musical tone data created based on the pattern data read from the RAM 12 to the musical tone generator 14 is performed. For example, when the part switch 139 is turned on, that effect is stored as a flag in the RAM 12, and thus the parts 1 to 4 reading processing routine described above is performed based on the pattern data of the rhythm part read from the RAM 12. The generated musical tone data is controlled so as to be sent to the musical tone generator 14. As a result, the musical sound of the rhythm part is generated. On the other hand, when the part switch 139 is turned off, the fact is notified to the RAM 1
Therefore, the musical tone data stored based on the pattern data of the rhythm part read from the RAM 12 in the above-described part 1 to 4 reading processing routine is not sent to the musical tone generator 14. Controlled. Therefore, the generation of the musical sound of the rhythm part is stopped. Similar processing is performed for the bass part, the accompaniment part, and the melody part. When the above panel control processing ends, the panel control processing routine returns and returns to the main routine.

(4) Tempo Speed Processing 1 (FIG. 6) Next, details of the tempo speed processing 1 executed in step S31 of the panel control processing routine will be described with reference to the flowchart of FIG. In the tempo speed process 1, a process of changing the tempo speed according to the operation of the up / down switch 133 is performed. This tempo speed processing 1 corresponds to the changing means.

In the tempo speed process 1, first, the up / down switch 133, that is, the up switch 133A.
Alternatively, it is checked whether there is any on event of the down switch 133B (event 50). This is done by checking whether the bit corresponding to either the up switch 133A or the down switch 133B in the new panel data is set to "1". If it is determined that there is an on event, the TMPON flag is set to "1" (step S51). The TMPON flag is a flag defined in the RAM 12 and stores whether or not either the up switch 133A or the down switch 133B continues to be turned on. This TMPON flag is
It is referred to in the timer B interrupt processing routine described later and is used to realize the auto increment function (details will be described later).

Then, the counter TMPTIM is cleared to zero (step S52). This counter TMPT
IM is a counter defined in the RAM 12. This counter TMPTIM is updated in the timer B interrupt processing routine described later, and is used to count the time interval for updating the tempo speed value in the auto increment function (details will be described later).

Then, in step S50, it is checked whether or not the switch having the ON event is the up switch 133A (step S53). When it is determined that the event is the up switch 133A, "+1" is stored in the register TMPCNT. Is set (step S5
4) Otherwise, it is recognized that the event is the event of the down switch 133B, and the register TMPCNT indicates "-".
1 "is set (step S55). Here, the register TMPCNT is a register defined in the RAM 12 and is used to specify the rate R when changing the tempo speed value.

Next, the rate R is created according to the contents of the register TMPCNT (step S56). The correspondence between the contents of the register TMPCNT and the rate R is shown in FIG.
It is stored in the ROM 11 as a conversion table in the format shown in FIG. That is, the content of the register TMPCNT is "+".
In the case of "1", "1.01" is created as the rate R,
When the content of the register TMPCNT is "-1", "0.99" is created as the rate R. This rate R is
In the next step S57, it is used to calculate the new tempo speed.

Next, the current tempo speed value stored in the tempo register of the RAM 12 is multiplied by the rate R to calculate the new tempo speed value (step S5).
7). Then, the calculated new tempo speed value is adjusted by the tempo limiter so that the tempo speed value falls within the range of "30" to "300" (step S58). The temp limiter is, for example, the CPU 1.
It can be configured by processing 0, and is adjusted to "30" when the result of the multiplication is "30" or less and "300" when the result is "300" or more.

Then, the preset value of the timer A16 is updated (step S59). That is, the data for generating the interrupt signal is set in the timer A16 at a time interval that provides the new tempo speed. Accordingly, thereafter, the interrupt signal is generated from the timer A16 at a time interval corresponding to the new tempo speed, and the remaining gate time is updated in the timer A interrupt process described later. As a result, the time for updating the remaining gate time is performed according to the new tempo speed, and the automatic performance according to the new tempo speed is performed.

Next, the new tempo speed value is sent to the tempo speed display 132 and the updated tempo speed value is displayed (step S60). Thereafter, the routine returns from the tempo speed processing 1 routine and returns to the panel control processing routine.

When it is determined in step S50 that the up / down switch 133, that is, either the up switch 133A or the down switch 133B is not an on event, the TMPON flag is cleared to "0" (step S61). As a result, the up switch 1
It is determined that neither 33A nor the down switch 133B is pressed, and the processing for realizing the auto increment function in the timer B interrupt processing routine described later is not performed. After that, this tempo speed processing 1
The routine returns and returns to the panel control processing routine.

(5) Tempo Speed Processing 2 (FIG. 7) Next, details of the tempo speed processing 2 executed in step S33 of the panel control processing routine will be described with reference to the flowchart of FIG. In the tempo speed process 2, a process of changing the tempo speed according to the operation of the wheel 155 is performed. This tempo speed processing 2 corresponds to the changing means.

In the tempo speed process 2, first, wheel data is set in the register TMPCNT (step S70). As the wheel data, the wheel data included in the new panel data is used.
As shown in, values from "+10" to "-10" are used. Then, it is checked whether the content of the register TMPCNT is "0" (step S7).
1). Here, when it is determined that the content of the register TMPCNT is not "0", that is, when it is determined that the wheel 155 has been moved from the center position, the TMPO
The N flag is set to "1" (step S72).
As a result, the processing for realizing the auto-increment function is performed in the timer B interrupt processing routine described later (details will be described later).

Then, the counter TMPTIM is cleared to zero (step S73). As a result, the counter TMPTIM starts counting from zero in the timer B interrupt processing routine, which will be described later, and starts counting the time for implementing the auto-increment function (details will be described later).

Then, the rate R is created according to the contents of the register TMPCNT (step S74). The correspondence between the contents of the register TMPCNT and the rate R is stored in the ROM 11 as a conversion table in the format shown in FIG. 15, for example. That is, the rate R “1.10” to the value of “+10” to “−10” set in the register TMPCNT according to the operation position of the wheel 155.
"0.90" (excluding "1.00") is created.
This rate R is used to calculate the new tempo speed in the next step S75.

Next, the current tempo speed value stored in the tempo register of the RAM 12 is multiplied by the rate R to calculate a new tempo speed value (step S75).
The calculated new tempo speed value is passed through the tempo limiter (step S76), the preset value of the timer A16 is updated (step S77), and the updated tempo speed value is displayed (step S78). Step S above
Each processing of 75 to 78 is the tempo speed processing 1 described above.
This is the same as the processing of steps S57 to S60. afterwards,
The routine returns from this tempo speed processing 2 routine and returns to the panel control processing routine.

In step S70, the register TMPC
When it is determined that the content of NT is "0", that is, when the wheel 155 is returned to the center position, the TMPON flag is cleared to "0" (step S79). As a result, the processing for realizing the auto-increment function in the timer B interrupt processing routine described later is not performed (details will be described later). After that, the routine returns from this tempo speed processing 2 routine and returns to the panel control processing routine.

(6) Timer A Interrupt Processing (FIG. 8) Next, the timer A interrupt processing routine will be described. This timer A interrupt processing routine is started by supplying an interrupt signal from the timer A16 to the interrupt signal input terminal INT2 of the CPU 10. Therefore, this timer A interrupt processing routine is started at a time interval corresponding to one step time at the tempo set at that time, in other words, at a time interval corresponding to the tempo speed.

In the timer A interrupt process, it is first checked whether or not the automatic performance flag is turned on (step S80). That is, it is checked whether or not the automatic performance device to which the present tempo speed control device is applied is performing automatic performance. If it is determined that the automatic performance flag is on, the content of the beat register BTR is incremented (step S81), and it is checked whether the result is "192" or more (step S82). And
When it is determined that the number is "192" or more, the beat register BTR is cleared to zero (step S83), and the bar register BRR is incremented (step S8).
4). If it is determined in step S82 that it is not "192" or more, the processes of steps S83 and S84 are skipped. The processing of steps S81 to S84 realizes the function of incrementing the bar register BRR and the beat register BTR for each step time in a linked state.

Then, the gate times of all parts are updated (step S85). That is, the remaining gate time included in the register group (provided in the RAM 12) storing the remaining gate time of all parts is “0”.
Anything other than is decremented. Then, as a result of this decrement, if there is a remaining gate time that has become zero, a key-off output is performed for the key code corresponding to the remaining gate time, and sounding is stopped.

If it is determined in step S80 that the automatic performance flag is not on, it is recognized that the automatic performance is not in progress, and only the gate times of all parts are updated. Then, the routine returns from the timer A interrupt processing routine to return to the interrupted position. Thus, by decrementing the remaining gate time by this routine which is called depending on the tempo speed, the length of sound generation according to the tempo speed is determined.

(7) Timer B Interrupt Process (FIG. 9) Next, the timer B interrupt process will be described with reference to the flowchart shown in FIG. In this timer B interrupt processing, the auto increment function is realized. The auto-increment function is 0.8 seconds after the operation of the up / down switch 133 or the wheel 155 is started or the tempo speed value is updated to 0.
This is realized by changing the current tempo speed value according to the rate R and setting the new tempo speed value every 8 seconds. The value of “0.8 seconds” is an example, and the value is not limited to this value and any value can be used.

In this timer B interrupt processing routine, the interrupt signal from the timer B20 is the interrupt signal input terminal I of the CPU 10.
It is started by being supplied to NT3. Therefore, this timer B interrupt processing routine is started at 0.1 second intervals.

In the timer B interrupt processing, first, TMPON
It is checked whether the flag is "1" (step S90). If it is determined that the TMPON flag is not "1", it is recognized that the up / down switch 133 has not been pressed or the wheel 155 has not been operated, and this timer is skipped without performing the processing of step S91 and thereafter. Return from the B interrupt processing routine to return to the interrupted position. That is, the auto increment function does not operate.

On the other hand, when it is determined that the TMPON flag is "1", it is recognized that the up / down switch 133 is continuously pressed or the wheel 155 is continuously operated, and the auto increment in step S91 and thereafter is performed. Processing is performed. That is, first, the register TMPTI
The content of M is incremented (step S91).
Then, it is checked whether or not the content of the register TMPTIM is "8" or more (step S92). here,
If it is determined that it is not "8" or more, it is recognized that 0.8 seconds has not elapsed yet and the timing for calculating the new tempo speed value has not yet been reached. Return from the interrupt processing routine to return to the interrupted position. This step S90-S
The processing of 92 corresponds to the operation continuation detecting means and the timing generating means of the present invention.

On the other hand, if it is determined that the value is "8" or more, 0.8 seconds have passed since the operation of the up / down switch 133 or the wheel 155 was started, or since the tempo speed value was updated last time. It is recognized that 0.8 seconds has elapsed, and "0" is set in the register TMPTIM (step S93). As a result, the new tempo speed is set to be calculated again after 0.8 seconds.

Then, the rate R is created according to the contents of the register TMPCNT (step S94). At this time, if the auto increment function is realized by continuously pressing the up switch 133A, "1.01" is created as the rate R, and the down switch 1
When the auto-increment function is realized by continuously pressing 33B, the rate R is set to "0.9.
9 ”is created and the auto increment function is realized by continuously operating the wheel 155,
Depending on the operation position of the wheel 155, "1.10" ~
Any rate R of "0.90" (excluding "1.00") is created.

Next, the current tempo speed value stored in the tempo register of the RAM 12 is multiplied by the rate R to calculate a new tempo speed value (step S95).
The calculated new tempo speed value is passed through the tempo limiter (step S96), the preset value of the timer A16 is updated (step S97), and the updated tempo speed value is displayed (step S98). Step S above
Each processing of 95 to 98 is the tempo speed processing 1 described above.
This is the same as the processing of steps S57 to S60. afterwards,
This timer B interrupt processing routine returns and returns to the interrupted position.

As described above, in the first embodiment, when the up / down switch 133 which can be operated in both the positive side and the negative side is operated, its positive or negative displacement is detected, and the displacement is detected. The current tempo speed is changed at a predetermined rate according to. More specifically, when a positive displacement is detected, “+ M” is used as “± M” in the equation (2), and when a negative displacement is detected, the equation (2) is calculated. M
Is used to increase or decrease the current tempo speed at a predetermined rate.

As shown in the equation (2), the new tempo speed is calculated by multiplying the current tempo speed by a predetermined coefficient "(1.00 ± M)". The proportion of the tempo speed changed by one operation of the manipulator becomes large, and conversely, if the current tempo speed is small, the proportion becomes small. Therefore, the influence of the current tempo speed on the number of times the tempo operator should be operated is reduced, and the target tempo speed can be quickly approached.

Also, each time the up / down switch 133 is operated, the current tempo speed value is changed according to the function shown in the above equation (2), so the tempo speed is exponentially increased or decreased. Such an exponential change in tempo speed is in accordance with the human sense, and the tempo change is not unnatural, resulting in excellent operability.

In the first embodiment, when the wheel 155 having the center position as the non-operating position and operable in both the positive side and the negative side is operated, its positive or negative displacement amount is changed. Is detected, and the current tempo speed is changed at a predetermined rate according to the displacement amount. More specifically, when a positive displacement amount is detected, “+ M” is used as “± M” in the above formula (2), and when a negative displacement amount is detected, the above (2) is used. "-M" is used as M in the expression, and the current tempo speed is increased or decreased at a rate according to the displacement amount. With this configuration, the current tempo speed can be greatly changed by one operation of the wheel 155,
The target tempo speed can be reached quickly.

In addition, in the first embodiment, the auto increment function is realized. That is, the up / down switch 133 or the wheel 155 is operated for a predetermined time (for example, 0.8
If it is detected that the operation is being continued by continuing to operate for more than 2 seconds), the current tempo speed is maintained at a predetermined rate, for example, every 0.8 seconds while the operation is being detected. Be changed.

In this way, the up / down switch 133
Alternatively, since the tempo speed can be automatically increased or decreased by continuously operating the wheel 155, there is an advantage that the tempo setting operation becomes simple and quick. Moreover, if the current tempo speed is high, the proportion of tempo speeds updated at regular time intervals is large, and conversely, if the current tempo speed is small, the proportion is small. Therefore, the influence of the current tempo speed on the time during which the tempo operator continues to operate is reduced, and the tempo speed can be brought close to the target tempo speed by changing the tempo speed according to the human sense.

(Embodiment 2) When the auto increment function is realized in Embodiment 1, the current tempo speed is exponentially changed according to the operation of the tempo operator by multiplying the current tempo speed by a predetermined coefficient. In the second embodiment, the tempo speed is changed by adding a predetermined constant to the current tempo speed, and the time interval of the addition is set to the tempo speed. By changing it accordingly, the same effect as that of the above-described first embodiment is to be exhibited. Hereinafter, differences from the first embodiment will be mainly described.

As the automatic performance device to which the tempo speed control device of the second embodiment of the present invention is applied, the same one as shown in the block diagram of FIG. 1 is used. However, the timer B20 is unnecessary, and therefore the interrupt signal input terminal INT3 of the CPU 10 is also unnecessary. In addition, the operation panel 1
3 (FIG. 2) is the same as that used in the first embodiment.

Next, the operation of the second embodiment of the automatic performance device to which the tempo speed control device of the present invention is applied will be described with reference to FIG.
This will be described in detail with reference to the flowcharts shown in FIGS. The main process (FIG. 3), the MIDI-IN interrupt process (FIG. 4) and the panel control process (FIG. 5) used in the first embodiment are also used in the second embodiment as they are.
These explanations are omitted.

(1) Tempo Speed Processing 1 (FIG. 10) Details of the tempo speed processing 1 executed in step S31 of the panel control processing routine will be described with reference to the flowchart of FIG. In the tempo speed process 1, a process of changing the tempo speed according to the operation of the up / down switch 133 is performed. This tempo speed processing 1 corresponds to the changing means.

In the tempo speed process 1, first, it is checked whether or not there is an on event of the up / down switch 133 (event 100), and when it is judged that there is an on event, the TMPON flag is set to "1". (Step S101), then the counter TMP
TIM is cleared to zero (step S102). The above processing is the same as the processing of steps S50 to S52 in FIG.

Next, in step S50, it is checked whether or not the switch having the ON event is the up switch 133A (step S103). When it is determined that the event is the up switch 133A, "+1" is stored in the register A. Is set (step S104), otherwise it is recognized as an event of the down switch 133B and "-1" is set in the register A (step S105). Here, register A is RAM1
2 is a register defined by 2 and is used to store the added value when changing the tempo speed value.

Next, the addition value A is added to the current tempo speed value stored in the tempo register of the RAM 12 to calculate the new tempo speed value (step S10).
6). Then, the calculated new tempo speed value is passed through the tempo limiter (step S107), and the timer A16
Is updated (step S108), the new tempo speed value is sent to the tempo speed indicator 132, and the updated tempo speed value is displayed (step S109). The processing of steps S107 to S109 is the same as the processing of steps S58 to S60 in FIG. After that, the routine returns from this tempo speed processing 2 routine and returns to the panel control processing routine.

If it is determined in step S100 that the up / down switch 133 is not the on event, the TMPON flag is cleared to "0" (step S109A). As a result, the up switch 133A
It is determined that neither the down switch 133B nor the down switch 133B is pressed, and the processing for realizing the auto increment function in the auto ink processing routine described later is not performed. After that, the routine returns from this tempo speed processing 2 routine and returns to the panel control processing routine.

As described above, in the tempo speed processing 1, the same function as that of the conventional tempo speed control device is realized except that the TMPON flag is set or cleared in accordance with the operation of the up / down switch 133. Has been done. That is, when the up switch 133A is pressed, the tempo speed is incremented by “+1”, and the down switch 133 is pressed.
When B is pressed, the tempo speed is decremented by "-1".

(2) Tempo Speed Processing 2 (FIG. 11) Next, details of the tempo speed processing 2 executed in step S33 of the panel control processing routine will be described with reference to the flowchart of FIG. In the tempo speed process 2, a process of changing the tempo speed according to the operation of the wheel 155 is performed. This tempo speed processing 2 corresponds to the changing means.

In the tempo speed processing 2, first, wheel data is set in the register TMPCNT (step S110), and then it is checked whether or not the content of the register TMPCNT is "0" (step S11).
1). When it is determined that the content of the register TMPCNT is not "0", the TMPON flag is set to "1" (step S72), and then the counter TMP is set.
TIM is cleared to zero (step S113). The above processing is the same as the processing of steps S70 to S73 in FIG.

Next, the additional value A is created according to the contents (wheel data) of the register TMPCNT (step S114). This added value A is used in the next step S115.
, Is used to calculate the new tempo speed.

Next, the addition value A is added to the current tempo speed value stored in the tempo register of the RAM 12 to calculate the new tempo speed value (step S11).
5) The calculated new tempo speed value is passed through the tempo limiter (step S116), the preset value of the timer A16 is updated (step S117), and the updated tempo speed value is displayed (step S118). The processes of steps S115 to S118 are the same as the processes of steps S106 to S109 of FIG. afterwards,
The routine returns from this tempo speed processing 2 routine and returns to the panel control processing routine.

In step S111, the register TMP
When it is determined that the content of CNT is "0", that is, when the wheel 155 is returned to the center position, the TMPON flag is cleared to "0" (step S119). As a result, the processing for realizing the auto increment function is not performed in the auto ink processing routine described later (details will be described later). After that, the routine returns from this tempo speed processing 2 routine and returns to the panel control processing routine.

As described above, in the tempo speed processing 2, the new tempo speed is calculated by adding or subtracting the displacement amount (addition value A) of the wheel 155 in accordance with the operation of the wheel 155. Therefore, the current tempo speed can be greatly changed by largely displacing the wheel 155.

(3) Timer A Interrupt Processing (FIG. 12) Next, the timer A interrupt processing routine will be described. This timer A interrupt processing routine is started by supplying an interrupt signal from the timer A16 to the interrupt signal input terminal INT2 of the CPU 10. Therefore, this timer A interrupt processing routine is started at a time interval corresponding to one step time at the tempo set at that time, in other words, at a time interval corresponding to the tempo speed.

This timer A interrupt process is performed in step S12.
Example 1 except that the automatic ink treatment of No. 6 is performed
8 is the same as the timer A interrupt processing routine (FIG. 8) (steps S80 to 85 are steps S120 to 1 respectively).
It corresponds to 25. ), The description is omitted. The auto ink process (step S126) is a process for realizing the auto increment function (details will be described later). Then, the routine returns from the timer A interrupt processing routine to return to the interrupted position. In this way, by calling the auto ink processing routine depending on the tempo speed, the tempo speed is changed at a time interval according to the tempo speed.

(4) Auto Ink Process (FIG. 13) Next, the auto ink process will be described with reference to the flow chart shown in FIG. In this auto ink process, the auto increment function is realized. The auto increment function has an up / down switch 13
3 or the current tempo speed value is added every time a predetermined time has elapsed since the operation of the wheel 155 was started or a predetermined time has elapsed since the tempo speed value was updated last time.
It is realized by performing a process for changing the value to a new tempo speed value.

This auto ink processing routine is called from the timer A interrupt processing routine. Therefore, this auto ink processing routine is started at time intervals according to the tempo speed.

In the auto ink process, first, TMPON
It is checked whether the flag is "1" (step S
130), if it is determined that the TMPON flag is not "1", the process from step S131 is not performed and the process returns from this auto ink processing routine to the timer A interrupt processing routine. It also returns from the routine and returns to the interrupted position. That is, the auto increment function does not operate.

On the other hand, when it is determined that the TMPON flag is "1", it is recognized that the up / down switch 133 is continuously pressed or the wheel 155 is continuously operated, and the automatic increment of step S131 and the subsequent steps is performed. Processing is performed. That is, first, the register TMPT
The content of IM is incremented (step S13)
1). Then, the content of the register TMPTIM is "32".
It is checked whether or not the above is satisfied (step S13).
2). If it is determined that the timing is not "32" or more, it is recognized that the tempo update timing has not yet come, and the processing in step S133 and subsequent steps is not performed and the process returns from this auto ink processing routine to return to the timer A interrupt processing. Returning to the routine, the timer A interrupt processing routine also returns to return to the interrupted position. The processes of steps S130 to S132 correspond to the operation continuation detecting means and the timing generating means of the present invention.

On the other hand, when it is determined that the value is "32" or more, the up / down switch 133 or the wheel 155.
It is recognized that a predetermined time has passed since the operation of (1) was started, or a predetermined time has passed since the tempo speed value was updated last time, and "0" is set in the register TMPTIM (step S133). Thus, the new tempo speed is set to be calculated again after the predetermined time.

Next, the added value A is created according to the contents of the register TMPCNT (step S94). At this time, when the auto increment function is realized by continuously pressing the up switch 133A, “+1” is created as the addition value A, and the down switch 133 is created.
When the auto increment function is realized by continuously pressing B, “−1” is created as the addition value A, and when the auto increment function is realized by continuously operating the wheel 155, the wheel 1 is
Depending on the operation position of 55, the added value A of any of "-10" to "+10" is created.

Next, the additional value A is created according to the contents (wheel data) of the register TMPCNT (step S134), and then the additional value A is added to the current tempo speed value stored in the tempo register of the RAM 12. A new tempo speed value is calculated (step S13
5) The calculated new tempo speed value is passed through the tempo limiter (step S136), the preset value of the timer A16 is updated (step S137), and the updated tempo speed value is displayed (step S138). The processes of steps S134 to S138 are the same as the processes of steps S114 to S118 of FIG. afterwards,
The routine returns from this auto ink processing routine to the timer A interrupt processing routine, and further returns from the timer A interrupt processing routine to return to the interrupted position.

The value "32" in step S132 is a value used for determining the tempo speed update interval, and is not limited to "32" and any value can be used.

As described above, in the second embodiment, the displacement when the up / down switch 133 or the wheel 155 is operated (± 1 in the case of the up / down switch 133, −10 in the case of the wheel 155). +1
0) is detected and the displacement is added or subtracted at each tempo change timing generated at time intervals according to the tempo speed while the up / down switch 133 or the wheel 155 is continuously operated for a predetermined time or longer. As a result, the current tempo speed is changed.

As described above, the tempo speed can be automatically increased or decreased by continuously operating the tempo operator, which has the advantage of simplifying the tempo setting operation. Moreover, the timing for changing the tempo speed is determined according to the tempo speed set at that time, so if the current tempo speed is large, the tempo change timing will occur at close intervals, and conversely, the current tempo speed will change. If it is small, the tempo change timing generation interval becomes coarse. Therefore, the influence of the current tempo speed on the time required for changing the tempo is small.

Also, by controlling the generation interval of the tempo change timing to be short or long in proportion to the tempo speed, the tempo change timing may be configured to approach the target tempo speed in a substantially constant time regardless of the current tempo speed. You can

When the wheel 155 is used, a value corresponding to the amount of displacement output from the wheel 155 is used as the value of M in the above equation (1). At this time, the wheel 155 has a positive displacement amount (“+ M”) when operated to the positive side with respect to the non-operating position (center position), and a negative displacement amount (“−M”) when operated to the negative side. M ”) is output. Therefore, the tempo speed amount and increase / decrease of the tempo speed that are changed by one calculation according to the equation (1) can be arbitrarily set, and the time to reach the target tempo speed can be arbitrarily adjusted.

[0163]

As described in detail above, according to the present invention,
It is possible to provide a tempo speed control device for an automatic performance device which is capable of quickly setting a target tempo speed regardless of the current tempo speed and has excellent operability.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a tempo speed control device of an automatic performance device which is commonly used in Examples 1 and 2 of the present invention.

FIG. 2A is a diagram showing an example of an operation panel commonly used in Embodiments 1 and 2 of the present invention,
(B) is a diagram showing a configuration of a wheel.

FIG. 3 is a flowchart showing a main routine commonly used in the first and second embodiments of the present invention.

FIG. 4 is a flowchart showing a MIDI-IN interrupt processing routine commonly used in the first and second embodiments of the present invention.

FIG. 5 is a flowchart showing a panel control processing routine commonly used in the first and second embodiments of the present invention.

FIG. 6 is a flowchart showing a tempo speed processing 1 routine used in the first embodiment of the present invention.

FIG. 7 is a flowchart showing a tempo speed processing 2 routine used in the first embodiment of the present invention.

FIG. 8 is a flowchart showing a timer A interrupt processing routine used in the first embodiment of the present invention.

FIG. 9 is a flowchart showing a timer B interrupt processing routine used in the first embodiment of the present invention.

FIG. 10 is a flowchart showing a tempo speed processing 1 routine used in a second embodiment of the present invention.

FIG. 11 is a flowchart showing a tempo speed processing 2 routine used in the second embodiment of the present invention.

FIG. 12 is a flowchart showing a timer A interrupt processing routine used in the second embodiment of the present invention.

FIG. 13 is a flowchart showing an auto ink processing routine used in Embodiment 2 of the present invention.

FIG. 14A is a diagram showing a configuration of a reception buffer commonly used in the first and second embodiments of the present invention,
(B) is a diagram showing a configuration of pattern data commonly used in the first and second embodiments of the present invention.

FIG. 15 is a diagram showing an example of a conversion table used in the first embodiment of the present invention.

[Explanation of symbols]

 10 CPU 11 ROM 12 RAM 13 Operation Panel 14 Musical Sound Generator 15 Speaker System 16 Timer A 17 MIDI Controller 18 FD Controller 19 Floppy Disk Drive Device 20 Timer B 30 System Bus 130 Bar / Beat Indicator 131 Code Display 132 Tempo Speed Display 133 Up / down switch 134 Stop switch 135 Play / pause switch 136 FF switch 137 REW switch 138 Repeat switch 139 Part 1 switch 140 Part 2 switch 141 Part 3 switch 142 Part 4 switch 143 to 150 LED indicator 155 wheel

Claims (8)

[Claims] 1. An automatic performance device that records or reproduces performance information at a predetermined tempo speed, and a tempo operator for instructing a change in tempo speed, and a displacement for detecting displacement when the tempo operator is operated. A tempo speed control for an automatic performance device, comprising: a detecting means; and a changing means for changing a current tempo speed at a predetermined rate according to a displacement of the tempo operator detected by the displacement detecting means. apparatus. 2. The tempo operator can be operated bidirectionally between a positive side and a negative side, and the displacement detection means detects a positive displacement or a negative displacement of the tempo operator. The tempo speed control device for an automatic performance device according to claim 1. 3. The changing means changes the current tempo speed according to a predetermined exponential function according to the displacement of the tempo operator detected by the displacement detecting means. Tempo speed controller for automatic performance equipment. 4. The tempo operator has a specific non-operation position, and outputs a multi-step displacement amount in both positive and negative sides with respect to the non-operation position, and the changing means is configured to change the displacement. The present tempo speed is changed according to the amount of displacement of the tempo operator detected by the detecting means.
The tempo speed control device for the automatic performance device described in. 5. An operation continuation detecting means for detecting that the operation is being continued when the tempo operator has been operated for a predetermined time or more, and a timing generating means for generating tempo change timing at a constant time interval. Further, the changing means is detected by the displacement detecting means at each tempo change timing generated by the timing generating means while the operation continuing means detects that the operation is being continued. The tempo speed control device for an automatic performance device according to any one of claims 1 to 4, wherein the current tempo speed is changed at a predetermined rate according to the displacement of the tempo operator. 6. An automatic performance device for recording or reproducing performance information at a predetermined tempo speed, and a tempo operator for instructing a change in tempo speed, and a displacement for detecting a displacement when the tempo operator is operated. Detection means, operation continuation detection means for detecting that the tempo operator has been operated for a predetermined time or more, and operation continuation detection means for detecting that the operation is being continued In the interval, the timing generation means for generating tempo change timing at a time interval according to the tempo speed and the displacement of the tempo operator detected by the displacement detection means at each tempo change timing generated by the timing generation means. The tempo speed of the automatic performance device according to the present invention. Control device. 7. The tempo speed control device for an automatic performance device according to claim 5, wherein the timing generation means generates a tempo change timing whose generation interval becomes shorter or longer in proportion to the tempo speed. 8. The tempo operator has a specific non-operation position, and outputs a multi-step displacement amount in both positive and negative sides with respect to the non-operation position, and the changing means changes each tempo. 6. The tempo speed control device for an automatic performance device according to claim 5, wherein the current tempo speed is changed in accordance with the amount of displacement of the tempo operator detected by the displacement detecting means at the change timing.