JP3152104B2 - Tempo control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tempo control device for controlling a tempo of an automatic performance in an automatic performance device in accordance with a player's operation.

[0002]

2. Description of the Related Art An automatic performance apparatus stores performance information (note data) relating to each note of a melody performance or an accompaniment performance in a memory or the like, and automatically reads out the stored performance information at a predetermined tempo and reads the performance information. The melody and accompaniment sounds are produced according to the output performance information. In this case, the performance tempo is determined by the frequency of the tempo clock output from a timer or the like. The frequency of the tempo clock can be freely changed by operating a tempo setting switch or the like.

[0003]

When the performance tempo during a performance is changed by operating a tempo setting switch or the like, the manner of change depends on the operation state (operation amount, operation speed, etc.) of the switch. It was very difficult to give a subtle tempo change corresponding to a hand gesture of a baton or the like during an actual performance. Therefore, recently, an accelerometer is built into an operator's baton, etc., and the maximum value of the output of the accelerometer according to the hand gesture is detected, and the tempo of the automatic performance is controlled at the detection timing. A control device is appearing. Such a tempo control device controls the playing tempo by generating a sound or advancing the sequence data when the maximum output value of the acceleration sensor is detected.

However, in the actual conducting method, the performance tempo is determined in accordance with various factors such as the hitting operation of the conductor, the acceleration / deceleration operation, the clicking operation, and the shape of the line drawn by the tip of the conductor connecting the hit points. . Also, the performance tempo differs depending on how well the operator is familiar with the commanding method, the mood of the operator at that time, the content of music (song genre), and the like. Therefore, at what timing the sound should be produced and at what timing the sequence data should be advanced, the performance tempo varies depending on the individual operator. Therefore, there is a problem that the tempo does not become as intended by the operator even if the sound is generated or the sequence data is advanced simply when the maximum output value of the acceleration sensor is detected as in the related art.

[0005] The present invention has been made in view of the above points, and controls the tempo arbitrarily by sounding at the time intended by the operator or by advancing the sequence data in accordance with the hand gesture of the operator. It is an object of the present invention to provide a tempo control device that can perform the control.

[0006]

According to a first aspect of the present invention, there is provided a tempo control device for detecting an oscillating motion of an operator, and the oscillating motion detected by the motion detecting device. Extracting means for extracting first and second feature points related to the swinging operation;
And control means for controlling the tempo of the performance on the basis of the extraction time point each time one of the selected one of the second feature points is extracted.

According to a second aspect of the present invention, there is provided a tempo control device for detecting an oscillating motion of an operator, and a motion related to the oscillating motion among the oscillating motions detected by the motion detecting device. Extraction means for extracting characteristic points, and control means for controlling the tempo of the performance based on a point in time after a predetermined time has elapsed from the point of extraction each time the characteristic points are extracted by the extraction means. is there.

[0008]

In the first invention, the motion detecting means detects the swinging motion of the operator, that is, the hand motion of the conductor.
The extracting means analyzes the detected swing motion and extracts two feature points (first and second feature points) related to the swing motion. For example, when the motion detecting means is an angular velocity sensor built in a baton, the extracting means extracts two maximum values and minimum values of the sensor output. The control means sounds based on the time when the maximum value of the output of the angular velocity sensor is extracted by the extraction means, advances the sequence data, or sounds based on the time when the minimum value of the output of the angular velocity sensor is extracted, or generates a sequence. Advance the data. As a result, it is possible to generate a sound at the time intended by the operator, to advance the sequence data, and to control the tempo at an arbitrary timing. In addition, as described in claim 2, the control means controls the tempo of the performance based on a point in time after a lapse of a predetermined time from the extraction point, so that the timing of the tempo control can be adjusted more widely.

In the second invention, the motion detecting means detects a swing motion of the operator, that is, a hand motion of the conductor. The extracting means analyzes the detected swing motion and extracts feature points related to the swing motion. For example, when the motion detecting means is an angular velocity sensor built in a baton, the extracting means extracts only one of the maximum value and the minimum value of the sensor output. The control means generates a sound or advances the sequence data based on a time point after a lapse of a predetermined time from the time point at which the feature point is extracted by the extraction means. As a result, the tempo can be controlled at an arbitrary timing by causing a sound to be generated at the time intended by the operator or by advancing the sequence data.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows a detailed configuration of an electronic musical instrument 1H including a keyboard, a tone generator circuit and an automatic performance device, and a baton 20 for outputting a tempo control signal corresponding to a hand gesture of an operator to the electronic musical instrument 1H, and a connection between the two. FIG. 4 is a hardware block diagram illustrating a relationship. First, the configuration of the electronic musical instrument 1H will be described. Microprocessor unit (CPU) 11
Controls the overall operation of the electronic musical instrument 1H.
The CPU 11 is connected to the ROM 1 via the bus 1G.
2, RAM 13, key press detection circuit 14, switch detection circuit 15, display circuit 16, sound source circuit 17, effect imparting circuit 1
8, timer 19, floppy disk drive (FD
D) 1A and MIDI interface (I / F) 1B
Are connected respectively.

In this embodiment, an electronic musical instrument in which the CPU 11 performs key press detection processing, tempo control data transmission / reception processing, and tone generation processing will be described.
It is needless to say that the present invention can be similarly applied to a configuration in which the module comprising the sound source circuit 17 and the module comprising the sound source circuit 17 are separately formed, and data is exchanged between the modules by the MIDI interface.
The ROM 12 stores various programs and various data of the CPU 11, and has a read-only memory (RO).
M). RAM 13 stores performance information and CPU
Numeral 11 temporarily stores various data generated when the program is executed, and a predetermined address area of a random access memory (RAM) is allocated to each of them and used as a register or a flag.

The keyboard 1C has a plurality of keys for selecting the pitch of a musical tone to be produced, has a key switch corresponding to each key, and, if necessary, a key pressing speed detecting device. And a touch detection unit such as a pressure detection device.
The keyboard 1C is a basic operation element for music performance, and it goes without saying that other operation elements, such as a drum pad, may be used.

The key press detection circuit 14 includes a circuit composed of a plurality of key switches provided corresponding to the respective keys of the keyboard 1C for designating the pitch of a musical tone to be generated. When the key is pressed, key-on event information is output, and when a key is newly released, key-off event information is output. Further, a key pressing operation speed or a pressing force at the time of key depression is determined to perform processing for generating touch data, and the generated touch data is output as velocity data. As described above, the key-on / key-off event information and the velocity information are expressed in the MIDI standard, and also include a key code and data indicating an assigned channel.

The panel switch 1D is used to start automatic performance /
It includes a stop switch, a pause (pause) switch, and various switches for selecting, setting, and controlling a tone color, a volume, an effect, and the like. The panel switch 1D has various other switches, but details thereof are publicly known, and a description thereof will be omitted. The switch detection circuit 15 detects the operation state of each operator on the panel switch 1D, and outputs a switch event corresponding to the operation state to the CPU 11 via the bus 1G. The display circuit 16 displays various information such as the control state of the CPU 11 and the contents of the setting data on the display unit 1.
E is displayed. The display unit 1E is configured by a liquid crystal display panel (LCD) or the like, and its display operation is controlled by the display circuit 16.

The tone generator 17 is capable of simultaneously generating musical tone signals on a plurality of channels. The tone generator 17 receives performance information (data conforming to the MIDI standard) provided via a bus 1G, and generates a musical tone signal based on the data. Occurs. The tone signal generating method in the tone generator circuit 17 may be of any type. For example, a memory reading method for sequentially reading out musical tone waveform sample value data stored in a waveform memory according to address data that changes in accordance with the pitch of a musical tone to be generated, or a method in which the address data is used as phase angle parameter data at a predetermined frequency A known method such as an FM method for performing a modulation operation to obtain musical tone waveform sample value data, or an AM method for performing a predetermined amplitude modulation operation using the above address data as phase angle parameter data to obtain musical sound waveform sample value data. You may employ suitably.

The effect imparting circuit 18 imparts various effects to the tone signal from the tone generator 17 and outputs the tone signal with the effect to the sound system 1F. Effect imparting circuit 1
The tone signal to which the effect is given by 8 is generated through a sound system 1F including an amplifier and a speaker (not shown). The timer 19 counts a time interval and generates a clock pulse for determining the tempo of the automatic performance. This clock pulse is given to the CPU 11 as an interrupt command.
1 executes various processes by an interrupt process. The floppy disk drive (FDD) 1A is an interface for taking in automatic performance data from an external storage medium, that is, a floppy disk, into the electronic musical instrument 1H, and writing automatic performance data processed in the electronic musical instrument 1H to a floppy disk.

MIDI interface (I / F) 1B
Connects between the bus 1G of the electronic musical instrument 1H and the MIDI interface (I / F) 27 of the baton 20,
The interface 27 is composed of the bus 2E and the MID
It is connected to the I interface 1B. Therefore, the bus 1G of the electronic musical instrument 1H and the bus 2E of the baton 20 are connected via the MIDI interfaces 1B and 27, so that data can be exchanged bidirectionally in accordance with the MIDI standard. It has become.

Next, the configuration of the baton 20 will be described. A microprocessor unit (CPU) 21 controls the operation of the baton 20. This CPU2
1 is connected to the ROM 22 and the RAM 2 via the bus 2E.
3, switch detection circuit 24, A / D converters 25 and 26,
A MIDI interface 27 and a timer 28 are connected to each other. The ROM 22 stores various programs and various data of the CPU 21, and is constituted by a read-only memory (ROM). The RAM 23 temporarily stores various data generated when the CPU 21 executes a program, and is assigned a predetermined address area of a random access memory (RAM) and used as a register or a flag. The switch group 29 includes an on / off switch of the baton 20, a delay time switch for adjusting the output timing of the tempo control signal, and the like. The switch detection circuit 24 detects the operation state of the switch group 29, and outputs data corresponding to the operation state to the CPU 21 via the bus 2E.

X direction piezoelectric vibration gyro sensor 2A and Y
The direction piezoelectric vibrating gyro sensor 2B is a two-axis orthogonal (X-axis) piezoelectric gyro sensor that generates a voltage proportional to the Coriolis force proportional to the angular velocity of rotation when the sensor rotates about one rotation axis. And Y axis). Therefore, the X-direction piezoelectric gyro sensor 2A
, The angular velocity ωX in the X-axis direction can be detected based on the voltage output from the controller, and the angular velocity ωY in the Y-axis direction can be detected based on the voltage output from the Y-direction piezoelectric gyro sensor 2B.

The noise removing circuits 2C and 2D remove noise components inside the sensors included in the sensor output signals from the X-direction piezoelectric vibrating gyro sensor 2A and the Y-direction piezoelectric gyro sensor 2B. It is composed of a low-pass filter that removes components. A /
The D converters 25 and 26 convert the sensor output signals from which high frequency components have been removed by the noise removing circuits 2C and 2D into digital signals. This A / D converter 25
And 26 are read by the CPU 21 in a predetermined cycle, and are used in the operation determination processing of the entire baton 20 by predetermined data processing.

The timer 28 generates an operating clock of the baton 20. This operating clock is given as an interrupt command to the CPU 21, and the CPU 21 detects the operating state of the baton 20 by an interrupt process. Is output to the electronic musical instrument 1H via the MIDI interfaces 27 and 1B.

Next, an example of processing executed by the microcomputer (CPU 21) in the baton 20 is shown in FIG.
8 will be described based on the flowchart of FIG. FIG. 2 is a diagram illustrating an example of a sensor output process performed by the microcomputer (CPU 21) in the baton 20. This sensor output process is a timer interrupt process that is executed in synchronization with the operation clock (period of about 10 ms) from the timer 28. This sensor output process is a series of processes according to a control program stored in the program ROM 22, and is executed in order in the following steps.

Step 1: Outputs of the X-direction piezoelectric vibration gyro sensor 2A and the Y-direction piezoelectric vibration gyro sensor 2B,
That is, digital signals output from the A / D converters 25 and 26 are taken in via the bus 2E. Step 2: DC component is removed. That is, the conductor 2
When the operator who operates 0 performs a low-speed rotation operation such as a turning operation other than the hand movement, a DC component, that is, a drift component is generated in accordance with the rotation operation, so that the digital signal captured in step 1 has a low-frequency cutoff frequency. It is removed by passing it through a high-pass filter.

Step 3: The absolute angular velocity is calculated based on the outputs X and Y of the X-direction piezoelectric vibration gyro sensor 2A and the Y-direction piezoelectric vibration gyro sensor 2B from which the DC component has been removed, and is stored in the absolute angular velocity register A_SPEED. . The absolute angular velocity is calculated by taking the route of the sum of the squares of the arithmetic expressions and the outputs X and Y as shown in step 3 of FIG. It should be noted that when the value of the absolute angular velocity calculated in this step is plotted with time on the horizontal axis, the result is as shown in FIG. Step 4: The average value of the absolute angular velocities calculated in step 3 at each timing from the time of the current timer interruption to the time of the timer interruption m times earlier is calculated and stored in the moving average register M_AVERAGE as a moving average value. For example, when m is “8”, a moving average value is obtained by dividing the sum of eight absolute angular velocities calculated at each timing by eight. Step 5: Calculate the average value of the moving average value calculated in Step 4 at each timing from the current timer interruption point to the nth timer interruption point and stored in the moving average register M_AVERAGE, and dynamically calculate the average value. Dynamic threshold register DY as threshold
Stored in NA_THRE.

Step 6: The value stored in the previous value register NOW is stored in the value register OLD two times before, the value stored in the current value register NEW is stored in the previous value register NOW, and the moving average value calculated this time (moving average register M_AVER)
AGE) is stored in the current value register NEW.
That is, the value register OLD and the previous value register N
The values stored in the OW and the present value register NEW are respectively shifted to new values. Step 7: A peak detection process is performed based on the stored values of the value register OLD, the previous value register NOW, and the current value register NEW. FIG. 3 is a diagram showing details of the peak detection processing. This peak detection processing is sequentially executed in the following steps.

Step 70: Whether or not the stored value of the previous value register NOW is equal to or more than the stored value of the value register OLD before and the value of the current value register NEW, that is, the moving average detected at the time of the previous timer interrupt. It is determined whether the value is a local maximum (peak). If YES, the process proceeds to the next step 71, and if NO, the process proceeds to step 8 in FIG. Step 71: Since it was determined in the previous step 70 that the time of the previous timer interrupt was the maximum value (peak) of the moving average value, a predetermined time has elapsed since the current peak determination time is calculated from the previous peak determination time. It is determined whether or not the process has been performed. If the predetermined time has elapsed (YES), the process proceeds to the next step 72, and if the predetermined time has not elapsed (NO), the process immediately proceeds to step 8 in FIG. In other words, the peak determined as YES again in step 70 when the predetermined time has not elapsed since the previous peak determination point means that the peak is actually a pseudo peak value caused by disturbance of the swinging motion of the operator. Because.

Step 72: It is determined whether or not the value stored in the previous value register NOW is larger than a certain threshold value. If it is larger (YES), the process proceeds to the next step 73, and if smaller (NO), the process immediately proceeds to FIG. Proceed to step 8. That is, the fact that the value stored in the previous value register NOW is smaller than the certain threshold value means that the values of Step 70 and Step 71
This is because the peak determined as YES in the above means a pseudo peak value caused by the disturbance of the swinging motion of the operator. Step 73: The value stored in the previous value register NOW is calculated in step 5 of FIG.
It is determined whether or not it is larger than the dynamic threshold value stored in YNA_THRE. If it is larger (YES), the process proceeds to the next step 74, and if smaller (NO), the process immediately proceeds to step 8 in FIG. That is, the peak value is always larger than the dynamic threshold value.

Step 74: It is determined whether or not the value stored in the previous value register NOW is larger than the value obtained by multiplying the value stored in the previous peak value register LAST_PEAK by a predetermined coefficient A of 1 or less. If the value is smaller, the process immediately proceeds to step 8 in FIG. That is, the peak value is considered to be a value approximately similar to the previous peak value. Step 75: It is determined whether the valley detected by the peak detection processing or the valley detection processing before the time of the current timer interrupt is a valley, and the valley detected last time is (YES).
In the case of, the peak detected this time is considered to be correct, so the process proceeds to the next step 76. If the peak detected last time is a peak (NO), the peak cannot be continuous. Is considered to be an error, and the process immediately proceeds to step 8 in FIG.

Step 76: Previous peak value register LA
The value stored in the previous value register NOW is stored in ST_PEAK. Step 77: A peak type determination process is performed to determine the rocking state of the peak detected this time. That is, this is a process of determining in which direction of the baton 20 the peak determined by the processes of steps 70 to 75 is caused by swinging.

FIG. 4 is a diagram showing details of the peak type determination processing. This peak type determination processing is sequentially executed in the following steps. Step 770: Calculate the angle based on the output X of the X-direction piezoelectric vibration gyro sensor 2A and the output Y of the Y-direction piezoelectric vibration gyro sensor 2B from which the DC component has been removed, and store it in the angle register θ. The angle is determined by step 77 in FIG.
It is calculated by an arithmetic expression shown in 0, that is, an arc tangent of a value obtained by dividing the output Y by the output X.

Step 771: It is determined whether or not the value stored in the angle register θ is greater than 180 ° and equal to or less than 300 °. If YES, the process proceeds to the next step 772, and if NO, the process proceeds to a step 773. Step 772: Assume that the current peak is caused by the operation type “1”. Step 773: Determine whether the stored value of the angle register θ is equal to or less than 60 ° and greater than 300 °,
In the case of YES, the process proceeds to the next step 774, and in the case of NO, the process proceeds to step 775. Step 774: Assume that the current peak is caused by the operation type “2”. Step 775: The determination of NO in steps 771 and 773 means that the stored value of the angle register θ is equal to or smaller than 180 ° and larger than 60 °. It is assumed that this is caused by the operation type “3”.

Step 776: Control mode register MO
It is determined whether DE is “1” and “1” (YE
In the case of (S), the process proceeds to the next step 777, where "0" (N
In the case of O), the process proceeds to step 78 in FIG. The control mode register MODE determines the mode of performing the output timing of the tempo key-on at the time of detecting the peak of the absolute angular velocity or at the time of detecting the valley. "1" indicates that the output is performed at the time of peak detection. "0" indicates that the detection is performed at the time of valley detection. Step 777: The value of the delay time register DLY_TIME is stored in the delay time counter DELAY. The delay time counter DELAY is a counter for setting a predetermined time for outputting a tempo key-on after a predetermined time has elapsed from the peak detection time or the valley detection time.

FIG. 9 is a diagram showing the relationship between the angle θ obtained by the arithmetic expression in step 770 and the type of operation.
That is, it is determined that the angle θ is greater than 180 ° and equal to or less than 300 ° (YES in step 771), which means that the angle θ is 60 ° in the direction of operation 1 as illustrated.
Is smaller than 300 ° (YES in step 773), it means that the angle θ is 180 ° or smaller and larger than 60 ° in the direction of operation 2 as shown (step 775). Is YES) means that the baton 20 has been swung in the direction of operation 3 as shown in the figure.

Step 78: The dynamics is obtained based on the peak value detected this time, and the process proceeds to Step 8 in FIG. This dynamics may be obtained by converting a peak value based on a conversion table provided for each peak type determined in the previous step 78, or may be obtained by a different arithmetic expression for each peak type.

Step 8: A valley detection process is performed based on the respective stored values of the value register OLD, the previous value register NOW and the current value register NEW. FIG. 5 is a diagram showing details of the valley detection processing. This valley detection processing is sequentially executed in the following steps.

Step 80: The value stored in the previous value register NOW is equal to or less than the value stored in the value register OLD before last time,
In addition, it is determined whether or not the value is equal to or less than the value stored in the current value register NEW, that is, whether or not the moving average value detected at the time of the previous timer interrupt is a minimum value (valley).
In the case of S, the process proceeds to the next step 81, and in the case of NO, FIG.
Go to step 9 of. Step 81: If the time of the previous timer interrupt is the time when the moving average value becomes the minimum value (valley), the previous step 80
In this case, it is determined whether or not a predetermined time has elapsed since the current valley determination time from the previous valley determination time. If the predetermined time has elapsed (YES), the next step 82 And the predetermined time has not elapsed (N
In the case of O), the valley determination this time is considered to be erroneous, so that the process immediately proceeds to step 9 in FIG.

Step 82: It is determined whether or not the value stored in the previous value register NOW is smaller than a certain threshold value. If smaller (YES), the process proceeds to the next step 83, and if larger (NO), the current valley determination. Is considered to be an error, and the process immediately proceeds to step 9 in FIG. Step 83: The value stored in the previous value register NOW is calculated in step 5 of FIG.
It is determined whether the value is smaller than the dynamic threshold value stored in YNA_THRE. If smaller (YES), the process proceeds to the next step 84, and if larger (NO), the valley determination this time is considered to be erroneous. The process immediately proceeds to step 9 in FIG.

Step 84: It is determined whether or not the peak detected by the peak detection processing or the valley detection processing is a peak before the time of the current timer interrupt. If the previous detection was a peak (YES), the current detection is performed. Since the detected valley is considered correct, the process proceeds to the next step 85. If the valley detected last time is NO (NO), the valley detected this time is considered to be erroneous, and the process proceeds to step 9 in FIG.

Step 85: A valley type determination process is performed to determine the rocking state of the valley detected this time. That is, it is determined which valley determined by the processing of steps 80 to 84 occurs after the peak of which operation type. FIG. 6 is a diagram showing details of the valley type determination processing. This valley type determination processing is sequentially executed in the following steps. Step 850: It is determined whether or not the peak type as a result of the previous peak type determination processing is “1”. If YES, proceed to the next step 851; if NO, step 8
Go to 52. Step 851: It is assumed that the current valley is generated by the operation type “1”. Step 852: It is determined whether or not the peak type based on the result of the previous peak type determination processing is “2”. If YES, proceed to the next step 853; if NO, step 8
Proceed to 54. Step 853: Assume that the current valley is generated by the operation type “2”. Step 854: Since the determination of NO in steps 850 and 852 means that the peak type according to the result of the previous peak type determination process is “3”, here, the valley of this time is the operation type. Assume that this was caused by “3”. Step 855: Control mode register MODE is "0"
Is determined, the process proceeds to the next step 856 if “0” (YES), and to FIG. 2 if “1” (NO).
Go to step 9 of. Step 856: Store the value of the delay time register DLY_TIME in the delay time counter DELAY, and proceed to step 9 in FIG.

Step 9: Tempo key-on output processing is performed based on the action type determined by the peak type determination processing of FIG. 4 or the valley type determination processing of FIG. FIG. 7 is a diagram showing details of the tempo key-on output processing. This tempo key-on output process is executed sequentially in the following steps. Step 90: Determine whether the delay counter DELAY is larger than "0", and larger than "0" (YES)
If it is, the process proceeds to the next step 91, and if it is smaller (NO), the process returns. Since the delay counter DELAY is normally set to “0” by the initial setting process, FIG.
Unless the value of the delay time register DLY_TIME is stored by the processing of step 777 of step 777 or step 856 of FIG. 6, the determination result of this step is NO. Step 91: Decrement the delay counter DELAY by "1". Step 92: Determine whether or not the delay counter DELAY is "0". If "0" (YES), proceed to the next step 93; otherwise (NO), return. Step 93: Key-on of a key code corresponding to the operation type determined by the peak type determination processing of FIG. 4 or the valley type determination processing of FIG. 6 is output, and the process waits until the next timer interrupt timing. In this embodiment, the key code "C3" when the peak type or the valley type is the operation "1", the key code "C $ 3" when the operation is "2", and the key code when the operation is "3". The key-on of code "D3" is output.

Step A: A delay time setting process corresponding to the operation of the delay time switch provided on the baton 20 is performed. FIG. 8 is a diagram showing details of the delay time setting process. This delay time setting process is executed sequentially in the following steps. Step A0: It is determined whether or not the delay time switch of the baton 20 has been operated.
If S), proceed to the next step A1, otherwise return. Step A1: Since it is determined in the previous step A0 that the delay time switch has been operated, it is determined here whether the operated delay time switch or the plus “+” switch has been operated. Proceed to A2, and if not, a minus switch (N
In the case of O), the process proceeds to step A3.

Step A2: Since it was determined in the previous step A1 that the plus switch of the delay time switch was operated, the delay time register DLY_
The value of TIME is incremented by "1". Step A3: Since it was determined in the previous step A1 that the minus switch of the delay time switch was operated,
Here, the value of the delay time register DLY_TIME is decremented by "1". Step A4: As a result of the increment processing of the previous step A2 or the decrement processing of step A3, limit processing is performed so that the value of the delay time register DLY_TIME does not become larger than a predetermined value or becomes smaller than “1”. The value “1” of the delay time register DLY_TIME set here corresponds to 10 ms.

Next, a description will be given of an example of how the sensor output processing is performed by swinging the baton 20, with reference to FIG. FIG. 10 is a schematic diagram showing the concept of the sensor output process in the case where the baton 20 swings in three beats so as to draw a triangular trajectory. FIG. 10A is a diagram showing an output waveform of the absolute angular velocity when the baton 20 swings in three beats, and FIG. 10B shows a peak when the control mode register MODE is “1”. FIG. 10C is a diagram showing the relationship between the detection time point and the output time point of the tempo key-on signal, and FIG.
FIG. 8 is a diagram showing a relationship between a valley detection time point and an output time point of a tempo key-on signal when the control mode register MODE is “0”.

FIG. 10B and FIG.
The value of the absolute angular velocity calculated in step 3 by swinging so as to draw a triangular locus as shown in FIG. 10C has a shape as shown in FIG. 1st peak, 1st
Peaks and valleys appear alternately in the order of valley, second peak, second valley, third peak, and third valley. First, a case where the control mode register MODE is “1” will be described. In this case, when the baton 20 is swung in the direction of 240 ° (diagonally downward left) in FIG.
The first peak is detected by the processing of No. 5. The first peak is determined to be the peak of the operation "1" by the processing of step 771 in FIG. 4, and the value of the delay time register DLY_TIME is stored in the delay counter DELAY by the processing of step 777. Therefore, after the first peak is detected, the delay counter DELAY
At a point in time delayed until the time becomes "0", the tempo key-on signal of the key code "C3" is output by the processing of step 9. In FIG. 10B, the detection point of the first peak is indicated by a large circle, and the output point of the tempo key-on signal is indicated by a small circle.

Thereafter, the conducting rod 20 is moved to 240 in FIG.
When it is swung in the direction of 0 ° (obliquely downward left) and in the direction of 0 ° (horizontal right), the first valley is detected by the processing of steps 80 to 84 in FIG. Is done. Then, the first valley is determined to be the valley of the operation “1” by the process of step 850 in FIG. Here, since the control mode register MODE is "1", nothing is stored in the delay counter DELAY, and the process ends without outputting a tempo key-on signal. Similarly, when the baton 20 is swung in the direction of 0 ° (horizontal right direction) in FIG. 9, the second peak is detected as the peak of the operation “2”, and a predetermined time has elapsed since the second peak was detected. Key code "C $"
3 "is output. Conducting rod 20 is 120 ° from the 0 ° direction (right horizontal direction) in FIG.
(The diagonally upper left direction), the second valley is detected as the valley of the operation “2” at the change point of the swinging operation. When the baton 20 is swung in the direction of 120 ° (diagonally upward to the left) in FIG. 9, the third peak is detected as the peak of the operation “3”, and it is delayed by a predetermined time from the time of detecting the third peak. At this point, a tempo key-on signal of key code "D3" is output. And again the conducting rod 20 is shown in FIG.
At 240 ° from the 120 ° direction (upward left diagonal)
(The diagonally downward left direction), the third valley is detected as the valley of the operation “3” at the changing point of the swinging operation.

On the right side of FIG. 10B, the relationship between the peak detection time and the output time of the tempo key-on signal when the baton 20 is swung up and down in two or four beats is shown. . In this case, the conductor 20 is 27 in FIG.
When it is swung in the direction of 0 ° (downward), the first peak is detected as the peak of the operation “1”, and at a point in time after the detection of the first peak by a predetermined time, the tempo key-on signal of the key code “C3” Is output. After that, the conductor 20
9, the first valley is detected as the valley of the operation “1” at the change point of the swinging operation when the direction is changed from the direction of 270 ° (downward) to the direction of 90 ° (upward) in FIG. And, similarly, the direction of the conducting rod 20 is 90 ° in FIG. 9 (upward direction).
Then, the second peak is detected as the peak of the operation "3", and the tempo key-on signal of the key code "D3" is output at a point in time after the detection of the second peak by a predetermined time. When the conductor bar 20 is swung in the direction of 270 ° (downward) from the direction of 90 ° (upward) in FIG. 9, the second valley is detected as the valley of the operation “3” at the changing point of the swinging operation. You.

Next, the case where the control mode register MODE is "0" will be described. In this case, the conductor 20
Is swung in the direction of 240 ° (obliquely downward leftward) in FIG. 9, the first peak is detected by the processing of steps 70 to 75. The first peak is determined to be the peak of the operation “1” by the process of step 771 in FIG. Here, since the control mode register MODE is “0”, nothing is stored in the delay counter DELAY, and the process ends without outputting a tempo key-on signal. Thereafter, the conducting rod 20 is moved to 2 in FIG.
When it is swung from the direction of 40 ° (the diagonally downward left direction) to the direction of 0 ° (horizontal right direction), at the changing point of the swinging operation, the first time is performed by the processing of steps 80 to 84 in FIG.
A valley is detected. Then, the first valley is determined to be the valley of the operation “1” by the process of step 850 in FIG. Further, the value of the delay time register DLY_TIME is changed to the value of the delay counter DELAY by the processing of step 856.
Is stored in Therefore, at a point in time when the delay counter DELAY becomes "0" after the detection of the first valley, the tempo key-on signal of the key code "C3" is output by the processing of step 9. FIG.
In (C), the detection point of the first valley is indicated by a large circle, and the output point of the tempo key-on signal is indicated by a small circle.
Similarly, when the command bar 20 is swung in the direction of 0 ° (horizontal right direction) in FIG. 9, the second peak is detected as the peak of the operation “2”. The conductor 20 is shown in FIG.
In the direction from 0 ° (horizontal right direction) to 120 ° (diagonally upper left direction), the second valley is detected as the valley of the operation “2” at the change point of the swinging operation. 2
At a point in time that is delayed by a predetermined time from the valley detection point, a tempo key-on signal of key code "C # 3" is output. When the baton 20 is swung in the direction of 120 ° (diagonally upward to the left) in FIG. 9, the third peak is detected as the peak of the operation “3”. When the conductor bar 20 is swung again from the direction of 120 ° (diagonally upper left) to the direction of 240 ° (diagonally lower left) in FIG. 3 ", and the key code" D "is delayed at a predetermined time after the detection of the third valley.
3 "is output.

The right side of FIG. 10C shows the relationship between the valley detection point and the output point of the tempo key-on signal when the baton 20 is swung up and down in two or four beats. . In this case, the conductor rod 20 is 270 ° in FIG.
(The downward direction), the first peak is detected as the peak of the operation “1”. After that, the conductor 20
Is swung in the direction of 90 ° (upward) from the direction of 270 ° (downward) in FIG. 9, the first valley is detected as the valley of the operation “1” at the change point of the swinging operation, and this valley is detected. The key code “C
3 "is output. Similarly, when the baton 20 is swung in the direction of 90 ° (upward) in FIG. 9, the second peak is detected as the peak of the operation “3”. The relationship between the valley detection time point and the output time point of the tempo key-on signal when the valley is detected is shown. The conducting rod 20 is 2 degrees from the direction of 90 ° (upward direction) in FIG.
When it is swung in the direction of 70 ° (downward), the second valley is detected as the valley of the operation “3” at the change point of the swinging operation, and the key is delayed by a predetermined time from the detection of the second valley. A tempo key-on signal of code "D3" is output.

In this way, by appropriately operating the delay time switch provided on the baton 20 and appropriately setting the delay time, the baton 20 can be moved by the operator in accordance with the hand gesture of any operator. Since the tempo key-on signal can be output at the intended time, the electronic musical instrument 1H can control the tempo arbitrarily by reproducing the sequence data according to the tempo key-on signal. . As will be described later, the tempo of the automatic performance is controlled in the electronic musical instrument 1H so that the output timing of the tempo key-on signal substantially coincides with the beat timing of the automatic performance. Beat timing.

Next, an example of how the microcomputer (CPU 11) in the electronic musical instrument 1H performs the tone reproduction process by inputting the tempo key-on signal will be described with reference to the flowcharts of FIGS. Will be explained. FIG. 11 is a diagram showing an example of a tone reproduction process performed by the microcomputer (CPU 11) in the electronic musical instrument 1H. This reproduction process is a timer interrupt process that is executed in synchronization with the operation clock (period approximately 1 ms) from the timer 19. This playback processing is performed by the program RO
This is a series of processes according to the control program stored in M12, and is sequentially executed in the following steps.

Step 40: It is determined whether or not the running state flag RUN is "1". If "1" (YES), it means that the reproduction process of the automatic performance data is performed. In the case of "0" (NO), it means that the reproduction process is not performed, so the routine immediately returns.
Wait until the next interrupt timing. Step 41: It is determined whether or not the pause flag PAUSE is “0”. If “0” (YES), the process is suspended and the process proceeds to the next step 42, and if “1” (NO), the process jumps to step 4B. I do. The suspension will be described later. Step 42: It is determined whether or not the timing counter TIME is "0". If "0" (YES), the process proceeds to the next step 43, and if it is a value other than "0" (NO), the process jumps to the next step 49. I do.

Step 43: Since it is determined in step 42 or 47 that the timing counter TIME is "0", the address of the RAM 12 is advanced, and the automatic performance data is read from that address position. Automatic performance data is event data (including channel number)
And delta time data. Step 44: It is determined whether or not the data read out in the previous step 43 is delta time data. If the data is delta time data (YES), the process proceeds to step 45, and if it is other event data (NO), step 46. Proceed to. Step 45: The delta time data read in step 43 is stored in the timing counter TIME.

Step 46: Processing corresponding to the event data read in step 43 (event handling processing)
Execute FIG. 12 is a diagram showing details of the event handling process.
This event handling process is executed sequentially in the following steps. Step 460: In this embodiment, the automatic performance data is 1 to
Since data of 16 channels is included, of which the channel number CH1 is used as a tempo control channel and the key-on event is used as a tempo control mark, the event data read out in the previous step 43 is the channel number. It is determined whether or not the event is a CH1 event. If YES, the process proceeds to a step 461; if NO, the process proceeds to a step 465 because the event is of another channel number. The key-on event of the channel number CH1 is stored at the position of each beat timing, and the key code of each event is C3, C♯3, D3, C3, C♯3, D3 in the case of a tune of three beats. .. Are arranged in the order of C3, D3, C3, and D3 in the case of two or four beats.

Step 461: Since it is determined in the previous step 460 that the event is the channel number CH1, it is determined here whether the key-on receive flag KON_RCV is “1”. If “1” (YES), step 462 is performed. The process proceeds to step 463 if “0” (NO). Step 462: The fact that the key-on receive flag KON_RCV is “1” in the previous step 461 means that the tempo key-on signal has already been input from the baton 20 via the MIDI interface 27 and 1B before the event of the channel number CH1 is read. In this case, the key-on receive flag KON
“0” is set to _RCV, and the routine proceeds to step 47.

Step 463: The fact that the key-on receive flag KON_RCV is "0" in the previous step 461 means that the tempo key-on signal corresponding to the event of the channel number CH1 read in the previous step 43 has not been input yet. Here, the key code of the read event is stored in the key code register KEYCODE. Step 464: Since the tempo key-on signal has not been input yet, "1" is set to the pause flag PAUSE, and the routine proceeds to the next step 47. Pause flag PAUS
By setting E to "1", the determination in step 41 becomes NO thereafter, and steps 42 to 4A are not executed. Step 465: Since it was determined in the previous step 460 that the event was other than the channel number CH1, here,
The event is output to the tone generator 17. At this time, if the event is a note event, step 78 in FIG.
Modify the velocity according to the dynamics determined by. By correcting the velocity, the volume of the musical sound can be arbitrarily controlled according to the swinging operation such as the speed of swinging of the baton 20. Note that elements other than the volume, for example, tone color and pitch, may be arbitrarily controlled.

Step 47: Since the delta time data read in the previous step 45 may be "0", it is determined here again whether or not the timing counter TIME is "0". If the next step 4
Proceeding to step 3, if it is a value other than "0" (NO), jump to the next step 49. The fact that the delta time data is “0” means that a plurality of events exist at the same timing. Step 48: Multiply the value stored in the timing register TIME by the value stored in the tempo coefficient register T_COEF (tempo coefficient). Here, the tempo coefficient is a value based on “1”, and the tempo is controlled according to this value. For example,
When it is "0.5", the tempo is doubled and "2"
The tempo is halved.

Step 49: Timing register TIM
The value of E is decremented by "1". Step 4A: Delta accumulation register DELT
The value of A_ACM is incremented by “1”.
The delta accumulation register DELTA_ACM measures the time between events read from the channel number CH1. Step 4B: Interval Register INTERVAL
Is incremented by “1”. The interval register INTERVAL measures the time interval of the tempo key-on signal transmitted from the baton 20.

Step 4C: A tempo key-on reception process is performed. This tempo key-on reception process is a process performed each time a tempo key-on signal is received from the baton 20.
Therefore, when the tempo key-on signal is not received, no substantial processing is performed. FIG. 13 is a diagram showing details of the tempo key-on receiving process. This tempo key-on receiving process is executed in the following steps in order. Step 4C0: It is determined whether or not a tempo key-on signal has been received from the baton 20 via the MIDI interfaces 27 and 1B. If the signal has been received (YES), the flow proceeds to step 4C1, and if not (NO), FIG. And waits until the next interrupt timing.

Step 4C1: Temporary stop flag PAUS
It is determined whether E is “1”. If “1” (YES), the process proceeds to step 4C2, and if “0” (NO), the process proceeds to step 4C9. Step 4C2: The suspension flag P in the previous step 4C1
The determination that AUSE is "1" means that the channel number C is detected before the reception of the tempo key-on signal.
The event data of H1 is read, and the key code is already stored in the key code register KEYCOD in step 463.
In this case, it is determined whether the key code of the received tempo key-on signal matches the key code stored in the key code register KEYCODE. Proceeds to step 4C3, and if they do not match (NO), the process returns to the reproduction process of FIG. 11, and waits for the next interrupt timing.

Step 4C3: Interval register I
NTERVAL value and delta accumulation register D
The ratio with the value of ELTA_ACM is set in the rate register RATE.
To be stored. That is, the ratio between the time interval of the tempo key-on signal transmitted from the baton 20 and the time interval at which the event of the channel number CH1 is actually read is stored in the rate register RATE. Step 4C4: Multiply the value of the rate register RATE by the tempo coefficient of the tempo coefficient register T_COEF. Step 4C5: As a result of the processing of the previous step 4C4, limit processing is performed so that the value of the tempo coefficient register T_COEF does not become larger or smaller than a predetermined value. Step 4C6: Delta Accumulate Register DEL
"0" is set to TA_ACM. Step 4C7: Interval register INTERVA
Set “0” to L. Step 4C8: “0” is set to the temporary stop flag PUASE. Thus, the reproduction processing of FIG. 11 starts again.

Step 4C9: The fact that the temporary stop flag PAUSE is determined to be "0" in the previous step 4C1 means that the event data of the channel number CH1 has not been read out yet. Is searched for and read out the event of the next channel number CH1 which first appears. Step 4CA: It is determined whether or not the key code of the received tempo key-on signal matches the key code of the searched channel number CH1. If they match (YES), the process proceeds to step 4CA; if they do not match (NO), FIG.
The process returns to the playback process 1 and waits until the next interrupt timing.

Step 4CB: A value obtained by multiplying the accumulated value of the delta time data of each event read until the event of the channel number CH1 searched in the previous step 4C8 is searched by the tempo coefficient of the tempo coefficient register T_COEF. , The value of the timing register TIME at that time and the delta accumulation register DE
Add to LTA_ACM. Step 4CC: Delta time and timing register TIM up to the event searched in step 4C8
Multiply the value of E by 1 / B. Here, B is a value of 1 or more. That is, the delta time of each event and the value of the timing register TIME are reduced in order to increase the reproduction speed after receiving the tempo key-on signal from the baton 20 and make the timing of receiving the tempo key-on signal closer to the beat timing. . Step 4CD: Key-on receive flag KON_RC
V is set to "1", and the routine proceeds to step 4CE. Steps 4CE to 4CJ are the same as steps 4C3 to 4C7, and a description thereof will be omitted.

Next, by inputting the tempo key-on signal, how the microcomputer (CPU 11) in the electronic musical instrument 1H performs the reproducing process will be described.
An example of the operation will be described with reference to FIG. FIG. 14 is a diagram showing the relationship between the input timing of the tempo key-on signal taken into the electronic musical instrument 1H from the baton 20 and the timing of reading out the automatic performance data. At the timing t0, the event of the channel number CH3 is read in the step 43 through the steps 40 to 42 in FIG. 11, and the event is output to the tone generator in the step 465 in FIG. In the next step 43, the delta time D0 is read, and in a step 45, the timing register TIM is read.
The delta time D0 is written to E.

Thereafter, as the time corresponding to the delta time D0 elapses, the value of the timing register TIME also becomes 0. At the timing t1, the event of the channel number CH1 is read out at the step 43 through the steps 40 to 42 and the step 43. This timing t
At 1, the tempo key-on signal has not been received yet, so the determination at step 461 of FIG. 12 is NO, and at step 463 the key code “C3” of the event is stored in the key code register KEYCODE, and the pause flag PAUSE is set to “1”. Is set. Next step 43
, The delta time D1 is read, and in step 45, the delta time D1 is written to the timing register TIME. At timing t2, which is slightly later than timing t1, a tempo key-on signal of key code "C3" is received from the baton 20 to the electronic musical instrument 1H. As a result, the processing of steps 4C3 to 4C8 is performed through steps 4C0 to 4C2 of the tempo key-on reception processing of FIG.
NTERVAL value and delta accumulation register D
The ratio with the value of ELTA_ACM, for example, a value close to substantially 1 is newly stored in the rate register RATE, the tempo coefficient register T_COEF stores almost the same tempo coefficient as the previous time, and the interval register INTER
RVAL, Delta accumulation register DELTA_
“0” is set to the ACM and the pause flag PAUSE.

Thereafter, as the time corresponding to the delta time D1 elapses, the value of the timing register TIME also becomes 0, and the channel number C at the timing t3.
The event of H2 is read, and step 465 of FIG.
The event is output to the tone generator circuit. In the next step 43, the delta time D2 is read, and in a step 45, the delta time D2 is written in the timing register TIME. Hereinafter, similarly, at timings t3 to t
At 7, the events of the channel numbers CH3 to CH6 and the delta times D3 to D6 are sequentially read, and the respective events are output to the tone generator circuit. Thereafter, a time corresponding to the delta time D6 is being measured (timing register TI
At the timing t8 of the ME decrementing process), the key code “C $” is sent from the conductor 20 to the electronic musical instrument 1H.
3 "tempo key-on signal is received. As a result, step 4C0 of the tempo key-on reception processing of FIG.
Then, through steps 4C1, the processing of steps 4C9 to 4CJ is performed. In step 4C9, since the event of the key code "C $ 3" of the channel number CH1 is immediately searched, the process proceeds to step 4CA and then to step 4CB.
Is performed. In step 4CB, since the delta time did not exist before the event of the channel number CH1 was searched, the accumulated value of the delta time is "0" and only the value of the timing register TIME is the delta accumulation time. Rate register DELTA_A
It is added to CM. Thus, the relationship between the value of the delta accumulation register DELTA_ACM and the value of the interval register INTERVAL is: The delta accumulation DELTA_ACM is larger than the interval register INTERVAL.

In step 4CC, the delta time of each event and the value of the timing register TIME are multiplied by 1 / B in order to increase the reproduction speed after the timing t8 when the tempo key-on signal is received. In step 4CD, the key-on receive flag KON_RCV is set to "1". In steps 4C3 to 4C8, the ratio (a value smaller than 1) between the value of the interval register INTERVAL and the value of the delta accumulation register DELTA_ACM is newly stored in the rate register RATE. Stored
The tempo coefficient register T_COEF stores a smaller tempo coefficient than the previous time, and the interval register INTER
RVAL, Delta accumulation register DELTA_
"0" is set to the ACM and the pause flag PAUSE. After that, the timing register TIM
The value of E becomes 0, and the event of the channel number CH1 is read out at the timing t9.
At step 462, the key-on receive flag KON_R
“0” is set in CV. Hereinafter, similarly, at each timing, the event of the channel number and the delta time are stored in the tempo coefficient register T_COEF.
The data is sequentially read out while being corrected by a smaller tempo coefficient, and each event is output to the tone generator circuit. That is, if the timing of receiving the tempo key-on signal from the baton 20 is earlier than the timing of reading out the automatic performance data, the tempo of the automatic performance data reproduction process increases, and if the reverse, the reproduction of the automatic performance data is performed. The processing tempo goes down.

In the above-described embodiment, the sensor for detecting the swing operation is not limited to the piezoelectric gyro sensor, but may be an acceleration sensor, or a sensor using magnetism or light. For example, a configuration may be used in which a swing operation is imaged and the swing operation is detected by image processing. Further, a plurality of these sensors may be combined. Further, in the above-described embodiment, the case where the peak and the valley of the output from the piezoelectric gyro sensor are extracted as the first and second characteristic points as the characteristic points of the oscillating operation has been described. The feature point may be extracted by changing the type and using other conditions. Furthermore, in the above embodiment, the baton 20 and the electronic musical instrument 1H connected via the MIDI interface have been described as an example, but it goes without saying that both may be configured integrally. The tempo clock generated by the electronic musical instrument 1H may be supplied to an external device to control the performance tempo of the external device.

In the above-described embodiment, the case where the baton 20 detects the first and second characteristic points, that is, peaks and valleys, and further detects the type of operation, but the baton 20 is merely a swing operation. Needless to say, the sensor value corresponding to the output may be output, and the electronic musical instrument 1H may perform a detection process or the like corresponding to the output. Further, in the above-described embodiment, the case where the swing operation is detected by using two piezoelectric gyro sensors has been described, but it goes without saying that three or more piezoelectric gyro sensors may be used. In this case, for 3 beats and 2/4
Sensors provided at different positions for the beat may be used, or the swing operation may be detected by comprehensively judging the outputs of three or more sensors.

Further, in the above-described embodiment, the case where the sensor is built in the baton is described. However, the sensor is mounted on the operator's body (for example, a hand), or a microphone or other device (for example, a remote control of a karaoke apparatus, etc.). ). In this case, the output of the sensor output may be performed in a wired or wireless manner. For example, when the microphone is built in, the tempo control may be enabled only in the intro part of the karaoke, and the performance tempo of the karaoke may be determined according to the swinging operation of the microphone. In the embodiment, the case where the tempo is always controlled during the performance has been described. However, it may be used when the tempo is determined prior to the performance. In the embodiment, the case where the performance data is composed of the event and the delta time has been described, but it goes without saying that a storage method other than this may be used. For example, the performance data is composed of a set of an event and an absolute time. Also, the unit of delta time is ms
Or a time unit such as a quarter note (for example, 1/24 of a quarter note).

In the embodiment, the case where the tempo is controlled by multiplying the value of the delta time by the tempo coefficient and increasing / decreasing the value of the delta time has been described. However, by changing the cycle of processing (interruption timing). The tempo may be changed. In the embodiment, data for tempo control and data for automatic performance are mixed,
Although the case of distinguishing by channel number was explained,
Both may be separately provided in advance. For example, data storing a memory address corresponding to a note position for controlling a tempo may be used as tempo control data. When the tempo changes, the value of the tempo coefficient register T_COEF may be interpolated with the previous value so that the tempo changes smoothly. Similarly, the control of the dynamics may be smoothly changed. Each piece of music data has the optimal control setting information (information indicating where to control, that is, which peak or valley to use, and how long the delay is), so that basic settings can be made. You may.
Further, the basic settings may be changed. A plurality of basic settings may be provided so that any one of them can be selected. A type that can only select one of a peak and a valley (the delay time cannot be set) or a type that can set only the delay time (a peak or a valley cannot be selected) may be used. The delay time may be variably controlled according to the tempo.

[0071]

According to the present invention, it is possible to arbitrarily control the tempo by producing a sound at the time intended by the operator or by advancing the sequence data in accordance with the hand gesture of the operator.

[Brief description of the drawings]

FIG. 1 is a hardware block diagram showing a detailed configuration of an electronic musical instrument, a baton that outputs a tempo control signal corresponding to a hand gesture of an operator to the electronic musical instrument, and a connection relationship between the two.

FIG. 2 is a diagram illustrating an example of a sensor output process performed by a microcomputer in the baton in FIG. 1;

FIG. 3 is a diagram illustrating details of a peak detection process in FIG. 2;

FIG. 4 is a diagram illustrating details of a peak type determination process in FIG. 3;

FIG. 5 is a diagram illustrating details of a valley detection process in FIG. 2;

FIG. 6 is a diagram illustrating details of a valley type determination process in FIG. 5;

FIG. 7 is a diagram showing details of a tempo key-on output process of FIG. 2;

FIG. 8 is a diagram showing details of a delay time setting process of FIG. 2;

FIG. 9 is a diagram showing a relationship between an angle θ obtained by an arithmetic expression and an operation type.

[Fig. 10] 3
It is a schematic diagram which shows the concept of a sensor output process when rocking | fluctuation operation | movement is performed by a beat.

FIG. 11 is a diagram illustrating an example of a tone reproduction process performed by a microcomputer in the electronic musical instrument.

FIG. 12 is a diagram showing details of the event handling process of FIG. 11;

FIG. 13 is a diagram showing details of the tempo key-on reception processing of FIG. 11;

FIG. 14 is a diagram showing the relationship between the input timing of a tempo key-on signal taken into the electronic musical instrument from a baton and the timing of reading out automatic performance data.

[Explanation of symbols]

11, 21, CPU, 12, 22, ROM, 13, 23
... RAM, 14 ... Key press detection circuit, 15, 24 ... Switch detection circuit, 16 ... Display circuit, 17 ... Sound generator circuit, 18 ... Effect giving circuit, 19,28 ... Timer, 1A ... Floppy disk drive (FDD), 1B , 27 MIDI interface (I / F), 1C keyboard, 1D, 29 panel switch, 1E display unit, 1F sound system, 1G, 2E bus, 1H electronic musical instrument, 20 conductor rod, 25, 26 ... A / D, 2A ... X direction piezoelectric vibration gyro sensor, 2B ... Y direction piezoelectric vibration gyro sensor, 2
C, 2D: Noise removal circuit

Claims (4)

(57) [Claims] An operation detecting means for detecting an oscillating operation of an operator, and first and second feature points related to the oscillating operation are selected from the oscillating operations detected by the operation detecting means. Each time one of the first and second feature points selected is extracted by the extraction means, the control means controls the tempo of the performance based on the extraction time. A tempo control device characterized in that: 2. The tempo control device according to claim 1, wherein the control means controls the tempo of the performance based on a point in time after a lapse of a predetermined time from the extraction point. 3. An operation detecting means for detecting an oscillating operation of an operator; an extracting means for extracting a feature point related to the oscillating operation from the oscillating operation detected by the operation detecting means; A tempo control device for controlling the tempo of the performance based on a point in time after a predetermined time has passed from the point in time of extraction of the characteristic point by the extracting section. 4. The tempo control device according to claim 2, wherein the predetermined time can be set arbitrarily.