JP2998602B2 - Music 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 tone control device for detecting a movement of a player's body and controlling tone parameters for tone generation.

[0002]

2. Description of the Related Art There is known a tone control device which detects movement of a joint of a player such as a wrist or elbow and controls various tone parameters. The movement of the joint is mainly “bending” and “stretching”. When the player starts the bending operation and then stops the bending operation, a musical tone having a predetermined pitch (or tone color) is emitted when the bending operation is stopped. Conversely, when the player extends the joint and stops the stretching operation at a certain position, a musical tone of another pitch (or tone) is generated when the player stops. That is, by performing “bending” and “stretching” operations for one joint, two types of pitches or timbres can be generated.

FIG. 8 is a graph for explaining a control method of a musical sound control device according to the prior art. The horizontal axis indicates time, and the vertical axis indicates joint angles. The angle of the joint is detected by an angle sensor attached to the player's joint. An angle of 0 ° indicates that the joint is completely extended. The greater the angle, the greater the bending of the joint.

The angle XH is a threshold value of the upper limit angle,
Angle XL is a threshold value of the lower limit angle. The region ER1 is
This is a region having an angle larger than the angle XH, and is a region where the stop of the bending operation can be detected. When the stop timing BD of the bending operation is detected in the region ER1,
A musical tone having a pitch (or timbre) corresponding to the bending operation is generated.

The area ER2 is an area having an angle smaller than the angle XL, and is an area where the stop of the extension operation can be detected. In the area ER2, when the stop timing SR of the stretching operation is detected, a tone having a pitch (or timbre) corresponding to the stretching operation is generated.

The area ER0 is an angle area between the angle XL and the angle XH, and is a dead area in consideration of noise and the like. In the area ER0, even when the bending operation is stopped or the stretching operation is stopped, no musical tone is generated.

[0007]

When the bending operation is stopped in the joint angle region ER1, the conventional musical sound control device can generate a musical sound corresponding to the bending operation, and stops the extension operation in the joint angle region ER2. Then, a musical tone corresponding to the stretching operation can be generated. In the joint angle region ER0, no musical tone is generated even if the operation of the joint is stopped.

When the musical tone control device is applied to an electronic musical instrument such as a drum, there are cases where it is desired to generate two different types of sounds alternately. At this time, if the player tries to perform a quick action, the player tends to repeat the action of bending and extending the joint in small increments. As a result, the angle changes little by little in the angle region ER0. However, even if such a joint operation is performed in the joint angle region ER0, no sound is generated contrary to the intention of the player.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a musical tone control device capable of accurately detecting a joint movement of a player and instructing generation of a musical tone in accordance with the joint movement.

[0010]

According to the present invention, there is provided a musical sound control apparatus comprising: a sensor for detecting a position change indicating a joint operation; and a timing for stopping the joint operation in accordance with the position change of the joint operation detected by the sensor. A stop event detecting means for detecting the movement of the joint before the stop timing detected by the stop event detecting means in accordance with a change in the position of the joint movement detected by the sensor; And sounding instructing means for instructing generation of an attenuated sound corresponding to the joint motion before the stop timing detected by the motion detecting means in accordance with the stop timing detected by the event detecting means.

[0011]

The stop timing of the joint operation can be detected by examining the change in the position of the joint operation. Also,
Since the type of joint motion before the stop timing can also be detected, it is possible to know, for example, whether the bending operation has been stopped or the stretching operation has been stopped. When the stop timing is detected, it is possible to instruct generation of a different musical sound depending on, for example, whether the bending operation is stopped or the stretching operation is stopped.

[0012]

FIG. 1 is a block diagram of an electronic musical instrument to which a tone control device according to an embodiment of the present invention is applied.

The electronic musical instrument has operators 1L, 1R, angle sensors 2L, 2R, 3L, 3R, 4L, 4R and a belt 15. The belt 15 is wrapped around the waist of the player, and includes detectors 5L and 5R, an A / D converter (AD / AD converter).
C) 6L, 6R, CPU 7, ROM 8, RAM 9, timer 10, display / switch (SW) panel 11, sound source 1
2. It has a transmitter 13 and a bus 14.

The grip operators 1L, 1R are operators gripped by the player's left and right hands, respectively, and have grip keys that can be operated by switches. Detector 5L, 5R
Detects the state of the switches of the grip operators 1L and 1R, respectively.

The wrist sensors 2L and 2R are sensors for detecting the angles of the left and right wrists of the player, respectively.
The elbow sensors 3L and 3R are sensors for detecting the angles of the left and right elbows of the player, respectively. The shoulder sensors 4L and 4R are sensors for detecting the left and right shoulder angles of the player, respectively.

Each of the sensors 2 to 4 has a metal pattern disposed on a resin such as a flexible and elongated plastic. When the sensors 2 to 4 bend, the metal pattern expands and contracts, and the resistance value of the metal pattern changes. The bending angle can be detected by measuring the resistance value.

The sensors 2 to 4 are, for example, put in a bag in a supporter wound around each joint, and are brought into close contact with each joint. The angle of the wrist, the elbow and the shoulder can be detected according to the movement of the player.

The A / D converter 6L is a sensor 2 for the left body.
The resistance value data output from L, 3L, and 4L is converted from an analog signal to a digital signal. The A / D converter 6R converts the resistance value data output by the right body sensors 2R, 3R, 4R from an analog signal to a digital signal.

The timer 10 counts time and notifies the timing of detecting the joint angle of the player. The display / switch panel 11 has switches for setting sound source parameters such as timbres and effects, and a display device for displaying the setting state and the like.

The ROM 8 stores a computer program for operating the CPU 7 and various parameters. The RAM 9 is a working memory of the CPU 7,
It has a register, a buffer, and the like.

The CPU 7 is connected to a ROM 8 via a bus 14.
In addition to the RAM 9 and the detector 9, the detector 5, the A / D converter 6, the timer 10, the display / switch panel 11, and the sound source 12 are controlled.

The CPU 7 calculates the joint angle of the player from the resistance values of the sensors 2 to 4 obtained via the A / D converter 6. Then, the angular velocity of the joint is calculated based on the temporal change of the joint angle. When the angular velocity decreases from a predetermined value to around 0, it is determined that the movement of the joint has stopped, and the sound source 1
2 to output a musical tone parameter in order to instruct the sound generation of the pitch (or timbre) corresponding to the joint.

The tone generator 12 receives a tone parameter from the CPU 7 and generates a tone signal necessary for actually generating a tone. The transmitter 13 can output a tone signal generated by the sound source 12 to the outside. By connecting a D / A converter, an amplifier and a speaker to the transmitter 13, a musical sound is emitted.

The musician can produce a musical tone by bending or stretching a joint. Tones of different pitches or timbres are emitted depending on the type of joint. Further, when the joint is bent and when the joint is extended, musical tones having different pitches or timbres are emitted. The sound is generated when the bending or extension of the joint is stopped.

FIG. 2 is a graph for explaining the tone generation timing of the electronic musical instrument of the present embodiment. The horizontal axis indicates time, and the vertical axis indicates joint angles. The angle of the joint is detected by an angle sensor attached to the player's joint. A smaller angle indicates a state where the joint is elongated, and a larger angle indicates a state where the joint is bent.

The timing BD is a timing at which the performer stops the bending operation of the joint. At this timing, a musical tone having a pitch or tone corresponding to the bending operation is emitted. The timing SR is a timing at which the player stops the stretching operation of the joint, and at this timing, a musical tone having a pitch or tone corresponding to the stretching operation is issued.

In the prior art (FIG. 8), no sound was produced even when the joint operation was stopped at an angle between the threshold values indicated by the two dotted lines. In this embodiment, sound is also emitted when the bending operation is stopped or the stretching operation is stopped in the angle region between the two dotted lines. That is, even when the bending and stretching operations of the joint are repeated in small increments, it is possible to alternately produce musical tones of two pitches or timbres. Musical sounds of the same pitch or timbre can be produced continuously in a short period of time.

Next, a processing method for detecting the stop of the bending operation and the extension operation will be described. FIG.
9 is a flowchart illustrating a process of a main routine performed by a PU7.

In step SA1, initialization is performed. The initialization includes initialization of a register provided in the RAM 9, tone setting of the sound source 12, initialization of the timer 10, initialization of the A / D converter 6, and the like.

In step SA2, grip key processing of the grip operator 1 is performed. The player can perform various settings by performing a switch operation of the grip key. The CPU 7 detects the state of the switch and switches the angle detection mode.

At step SA3, a belt switch (S
W) Perform processing. Switch 11 provided on belt 15
, The tone color is set according to the state. At Step SA4, it is checked whether a predetermined time has elapsed. By checking the count value of the timer 10, it is possible to know whether or not a certain time has elapsed.
If the fixed time has not yet passed, step S
Returning to A2, the above processing is repeated. When the predetermined time has elapsed, the process proceeds to step SA5.

At Step SA5, an angle sensor process is performed. The angle sensor processing detects the angles of the joints of the wrist, elbow, and shoulder, and performs sound control as needed. Details will be described later with reference to another flowchart.

When the angle sensor processing is completed, step S
Returning to A2, the above processing is repeated. The angle sensor processing is repeatedly performed at regular time intervals. FIG. 4 is a flowchart showing details of the angle sensor processing in step SA5 in FIG.

In step SB1, the right wrist angle is detected. First, a time change of the angle of the right wrist is detected based on the resistance value detected from the right wrist sensor 2R.
The time change of the angle indicates the angular velocity. If the angular velocity is known, it is possible to detect the bending motion, the stretching motion, and the stop of the bending / stretching motion of the joint. When the stop of the joint operation is detected, a sound generation process is performed. Details will be described later.

In step SB2, a left wrist angle detection process is performed. Based on the resistance value detected from the left wrist sensor 2L, the angular velocity of the right wrist is detected, and sound generation control is performed as necessary, as described above.

In steps SB3 and SB4, a left and right elbow angle detection process is performed. Left and right elbow sensors 3L, 3R
Based on the resistance value detected from, the angular velocities of the left and right lists are detected, and sound generation is controlled.

At steps SB5 and SB6, a process for detecting the left and right shoulder angles is performed. That is, based on the resistance values detected by the left and right shoulder sensors 4L and 4R, the angular velocities of the left and right shoulders are detected, and sound generation control is performed.

Thus, the angle sensor processing is completed, and the process returns to the main routine of FIG. Note that the processing of the above six steps does not necessarily need to be performed continuously, and each processing may be performed instead of being performed at regular time intervals.

Since the above-described six step processes are almost the same, the following describes the right elbow angle detection process of step SB4 as a representative. Hereinafter, three types of right elbow angle detection processing examples will be described with reference to FIGS.

FIG. 5 is a flowchart showing a first example of the right elbow angle detection processing in step SB4 in FIG.
In step SC1, the data of the angle sensor is fetched,
Performs normalization of the angle range. After that, the normalized data is stored in the angle register ER (t). The angle register ER (t) stores the angle of the right elbow detected at the time t.

The data output from the angle sensor is an analog signal. Normalization is a process of converting an analog signal into a digital signal and then mapping the digital signal to a predetermined angle range in order to use the digital signal width effectively. The range of angles to be normalized is equal to the range from the angle of maximum extension to the angle of maximum flexion of the joint.

As preprocessing for normalization, the player may move the right elbow freely, and the angle range may be determined after detecting the maximum angle and the minimum angle of the elbow, respectively.

In step SC2, the angular velocity EVR is detected based on the angle ER (t) using the following equation. dt is a minute time larger than the sampling time of the angle sensor.

EVR = {ER (t) −ER (t−dt)} / dt In step SC3, the angular velocity E is calculated using the threshold value VS.
Determine the range of VR. The threshold value VS is a value slightly larger than 0 in consideration of noise.

When -VS <EVR <VS, the angular velocity EVR is almost 0, so that it is determined that the joint operation of the right elbow is in the stopped state, and the routine proceeds to step SC9. EV
When R ≦ −VS, it indicates that the angle is smaller than before because the angular velocity EVR is a negative value. A decrease in the angle indicates that the right elbow is being extended. In that case, step SC
Proceed to 4.

When EVR ≧ VS, the angular velocity EV
Since R is a positive value, it indicates that the angle is larger than before. An increase in the angle indicates that the right elbow is being bent. In that case,
Proceed to step SC6.

Step SC4 is a process when the player extends the right elbow, and checks whether or not the angular velocity EVR is smaller than the value of the register MIN. The initial value of the register MIN is 0. Angular velocity EVR is the register M
If it is smaller than IN, the process proceeds to step SC5 to update the value of the register MIN. In step SC5, the angular velocity EVR is stored in the register MIN, and the process proceeds to step SC8. The register MIN stores the smallest angular velocity in the past. Angular velocity EVR is the register M
If the value is not smaller than the value of IN, the process proceeds to step SC8 without updating the register MIN.

Step SC6 is a process when the player is bending the right elbow, and the angular velocity EVR is stored in the register M.
Check if it is greater than the value of AX. Register M
The initial value of AX is 0. Angular velocity EVR is the register MA
If it is larger than X, the process proceeds to step SC7 to update the value of the register MAX. In step SC7,
The angular velocity EVR is stored in the register MAX, and step SC
Proceed to 8. The register MAX stores the largest angular velocity in the past. Angular velocity EVR is the register MAX
If the value is not larger than the value of, the process proceeds to step SC8 without updating the register MAX.

At step SC8, the flag RUN is set to 1, and it is recorded that the player is stretching or bending the right elbow, and the process returns to the angle sensor processing of FIG.

Step SC9 is processing when the joint operation of the right elbow of the player is stopped, and the flag RUN is set.
Check if is equal to 1. When the flag RUN is not 1, since the joint operation has been continuously stopped from before, the process returns to the angle sensor process of FIG. 4 without performing the sound generation process.

When the flag RUN is "1", it indicates that the right elbow extension operation has been stopped or the bending operation has been stopped at that time, so that the process proceeds to step SC10 in order to perform sound generation processing.

At step SC10, the flag RUN is set to 0.
And record that the right elbow is stopped. In step SC11, the absolute value of the maximum angular velocity MAX is stored in the register PP, and the absolute value of the minimum angular velocity MIN is stored in the register MP.

At step SC12, it is checked whether or not the value of the register MP is smaller than the value of the register PP.
If the value of the register PP is larger, the absolute value of the maximum angular velocity MAX is larger than the absolute value of the minimum angular velocity MIN, so that it is determined that the joint operation is in the direction in which the maximum angular velocity MAX is detected. That is, it indicates that the joint operation has been stopped after performing the bending operation, and the process proceeds to step SC14.

If the register MP is greater than or equal to the register PP, the absolute value of the minimum angular velocity MIN is greater than the absolute value of the maximum angular velocity MAX.
It is determined that IN is a joint motion in the detected direction. That is, it indicates that the joint operation has been stopped after the extension operation has been performed, and the process proceeds to step SC13.

At step SC13, in order to perform the sound generation processing of the stretching operation, the value of the angular velocity register MP is stored in the velocity register VEL, and the tone corresponding to the stretching operation of the right elbow (the angular velocity is negative) is stored in the tone color register TC. Store. Thereafter, the process proceeds to Step SC15.

The velocity register VEL is a register for storing the magnitude of the angular velocity. Tone register T
C stores different tone colors between the stretching operation and the bending operation. Also, different tones are stored in the left and right elbows, and different tones are stored in the elbow, shoulder, and list. For example, drum sounds can be assigned to each joint action.

In step SC14, in order to perform the sound generation processing of the bending operation, the value of the angular velocity register PP is stored in the velocity register VEL, and the tone corresponding to the bending operation of the right elbow (the angular velocity is positive) is stored in the tone color register TC. Store. Thereafter, the process proceeds to Step SC15.

At Step SC15, it is checked whether or not the velocity register VEL is larger than the lower limit.
When it is smaller than or equal to the lower limit value, it is determined that the operation of the right elbow up to now has been detected by noise, and the process returns to the angle sensor process of FIG. 4 without performing the sound generation process.

When the velocity register VEL is larger than the lower limit value, a sound generation process is performed, so that step SC1 is executed.
Proceed to 6. In step SC16, the sound source 12 is instructed to generate a musical tone controlled by the tone color TC and the velocity VEL. The sound source generates a tone signal of an attenuated sound according to the tone color TC and the velocity VEL. For example, when the velocity VEL is large, a fast rising decay sound is generated. The tone color TC is a tone color corresponding to the direction of the joint operation.

At step SC17, the register MAX and the register MIN are cleared to 0 to prepare for the next tone generation. Thereafter, the process returns to the angle sensor processing of FIG. As described above, in the first processing example, of the angular velocities detected in the past, the peak angular velocity MIN in the extension direction and the peak angular velocity MAX in the bending direction are recorded, and the larger one of the two peak angular velocities is recorded. It is determined that the direction is the motion direction of the joint. Therefore, even when there is an unstable element in the detected value of the angle sensor each time, the operation direction can be accurately detected.

FIG. 6 is a flowchart showing a second example of the right elbow angle detection processing in step SB4 in FIG.
In step SD1, the data of the angle sensor is fetched,
Perform normalization. After that, the normalized data is stored in the angle register ER (t).

In step SD2, the angular velocity EVR is detected based on the angle ER (t) by the following equation. EVR = {ER (t) -ER (t-dt)} / dt In step SD3, the angular velocity E is calculated using the threshold value VS.
The range to which the VR belongs is determined. The threshold value VS is a value slightly larger than 0 in consideration of noise.

When -VS <EVR <VS, the angular velocity EVR is substantially 0, so that it is determined that the joint operation of the right elbow is in the stopped state, and the routine proceeds to step SD8. EV
When R ≦ −VS, since the angular velocity EVR is a negative value, it indicates that the right elbow is being extended,
Proceed to step SD4.

When EVR ≧ VS, the angular velocity EV
Since R is a positive value, it indicates that the right elbow is being bent, and the process proceeds to step SD5. Step SD4
Is a process when the player extends the right elbow, stores -1 in the sign register ESR (t), and proceeds to step SD6.

Step SD5 is a process when the player is bending the right elbow, and the code register ESR (t)
, And proceeds to step SD6. The sign register ESR (t) is set to -1 when the right elbow is extended.
Is stored, and +1 is stored when the right elbow is bent.

At Step SD6, the values of the five latest code registers ESR (i) are added and stored in the register X. That is, assuming that the current time is t, the values of the registers ESR (i) at five times from t-4 to t are added. Note that a register other than five may be added.

X = Σ (i = t−4 to t) ESR (i) In step SD7, it is recorded that the player is stretching or bending the right elbow.
The flag RUN is set to 1, and the process returns to the angle sensor processing of FIG.

Step SD8 is processing when the joint operation of the right elbow of the player is stopped, and the flag RUN is set.
Check if is equal to 1. When the flag RUN is not 1, since the joint operation has been continuously stopped from before, the process returns to the angle sensor process of FIG. 4 without performing the sound generation process.

When the flag RUN is 1, this indicates that the extending operation of the right elbow has been stopped or the bending operation has been stopped, so that the flow proceeds to step SD9 to perform sound generation processing.

At step SD9, the flag RUN is set to 0, and the fact that the right elbow is stopped is recorded.
In step SD10, the tone generator 12 is instructed to generate a tone having a tone corresponding to the sign of the numerical value of the register X among the tone assigned to the right elbow. The register X stores a value obtained by adding the sign of the last five angular velocities.

The value stored in the register X is a negative value when the number of times the angular velocity in the stretching direction is detected is compared with the number of times the angular velocity in the bending direction is detected. If the number of times in the bending direction is larger, the value becomes a positive value. That is, the register X has a negative value for the stretching operation and a positive value for the bending operation.

If the value of the register X is a negative value, a tone color corresponding to the right elbow extending operation is instructed. If the value of the register X is a positive value, a tone color corresponding to the right elbow bending operation is instructed to the sound source 12. Is done. After instructing the sound source 12 to generate the decay sound of the timbre, the process returns to the angle sensor processing of FIG.

As described above, in the second processing example, of the angular velocities detected in the past n times at regular intervals, the number of angular velocities in the extending direction and the number of angular velocities in the bending direction are compared, and Is the motion direction of the joint. When the number of times in the stretching direction and the number of times in the bending direction are almost the same and close to n / 2 times (when the absolute value of the register X is sufficiently smaller than n), no sound is generated because the operation direction is uncertain. If one of them is large enough compared to the other,
The direction is pronounced as the operation direction.

FIG. 7 is a flowchart showing a third example of the right elbow angle detection processing in step SB4 in FIG.
In step SE1, the data of the angle sensor is fetched,
Perform normalization. After that, the normalized data is stored in the angle register ER (t).

In step SE2, the angular velocity EVR is detected based on the angle ER (t) by the following equation. EVR = {ER (t) -ER (t-dt)} / dt In step SE3, low-pass filtering is performed on the angular velocity EVR by the following equation, and the filtered angular velocity is stored in the register EFR. However, at the beginning,
The register EFR is initialized to 0.

EFR = (EFR + EVR) / 2 The low-pass filter processing is not limited to the above equation. For example, weighted filter processing may be performed as in the following equation.

EFR = (EFR × 3 + EVR) / 4 In step SE4, the range of the filtered angular velocity EFR is determined using the threshold value VS. Threshold V
S is a value slightly larger than 0 in consideration of noise.

When -VS <EFR <VS, since the angular velocity EFR is substantially 0, it is determined that the joint operation of the right elbow is in the stopped state, and the flow advances to step SE8. EF
When R ≦ −VS, since the angular velocity EFR is a negative value, it indicates that the right elbow is being extended,
Proceed to step SE5.

When EFR ≧ VS, the angular velocity EF
Since R is a positive value, it indicates that the right elbow is being bent, and the process proceeds to step SE6. Step SE5
Is a process when the player extends the right elbow, sets 0 to the flag EXR, and proceeds to step SE7.

Step SE6 is a process performed when the player is bending the right elbow. The flag EXR is set to 1 and the flow advances to step SE7. The flag EXR is set to 0 when the right elbow is extended, and is set to 1 when the right elbow is bent.

At step SE7, the flag RUN is set to 1 in order to record that the performer is extending or bending the right elbow, and the process returns to the angle sensor processing of FIG.

Step SE8 is processing when the joint motion of the right elbow of the player is stopped, and the flag RUN is set.
Check if is equal to 1. When the flag RUN is not 1, since the joint operation has been continuously stopped from before, the process returns to the angle sensor process of FIG. 4 without performing the sound generation process.

When the flag RUN is 1, it indicates that the stretching operation of the right elbow has been stopped or the bending operation has been stopped, so that the process proceeds to step SE9 to perform sound generation processing.

At step SE9, the flag RUN is set to 0, and the fact that the right elbow is stopped is recorded.
In step SE10, the sound source 12 is instructed to generate a tone having a tone color corresponding to the flag EXR among the tone colors assigned to the right elbow. The flag EXR indicates the sign of the angular velocity immediately before the low-pass filter processing. When the flag EXR is 0, the tone color when the right elbow is extended is specified, and when the flag EXR is 1, the tone color when the right elbow is bent is specified. After instructing the sound source 12 to generate the decay sound of the timbre, the process returns to the angle sensor processing of FIG.

As described above, in the third processing example, noise can be removed by performing a low-pass filter process on the detected angular velocity, so that a stable joint motion can be detected. In particular, even when the detection value of the angle sensor fluctuates rapidly, the interpolated value fluctuates slowly, so that the stop of the operation can be reliably detected.

In this embodiment, when a stop event generated by stopping the joint operation is detected, it is possible to accurately detect whether the stop event is in the extension direction or in the bending direction. .

Further, regardless of the angle range of the joint, a stop event can be detected in any angle range and sound generation processing can be performed. When the performer repeatedly bends and stretches the joint in small increments, musical tones of two pitches or timbres are alternately produced, and a continuous playing can be performed.

Note that three examples of processing have been described as methods for detecting a stop event. These processes can be appropriately switched by the grip operator 1 or the switch 11 shown in FIG. Further, it is also possible to switch to the conventional detection method shown in FIG. The detection method of FIG. 8 is resistant to noise and can prohibit sound generation due to unnecessary operations.

Further, sound generation processing may be performed for the six angle sensors by using different stop event detection methods. They can also be freely selected by the player with a switch.

Further, the case where the angle of the joint is detected by using the angle sensor to calculate the angular velocity has been described. Instead, the relative position of the hand or arm is detected to detect the speed of the joint operation. You may.

The present invention has been described in connection with the preferred embodiments.
The present invention is not limited to these. For example, it will be apparent to those skilled in the art that various modifications, improvements, combinations, and the like can be made.

[0092]

As described above, according to the present invention,
It is possible to accurately detect the joint motion before the stop timing of the joint motion and to instruct generation of a different musical sound depending on the type of the joint motion.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an electronic musical instrument to which a tone control device according to an embodiment of the present invention is applied.

FIG. 2 is a graph for explaining sounding timing of the electronic musical instrument of the embodiment.

FIG. 3 is a flowchart illustrating a process of a main routine performed by a CPU in FIG. 1;

FIG. 4 is a flowchart showing details of an angle sensor process in step SA5 of FIG. 3;

FIG. 5 is a flowchart illustrating a first example of a right elbow angle detection process in step SB4 of FIG. 4;

FIG. 6 is a flowchart showing a second example of the right elbow angle detection process in step SB4 of FIG. 4;

FIG. 7 is a flowchart illustrating a third example of the right elbow angle detection process in step SB4 of FIG. 4;

FIG. 8 is a graph for explaining a control method of the musical sound control device according to the related art.

[Explanation of symbols]

1 grip operator, 2 wrist angle sensor,
3 Elbow angle sensor, 4 Shoulder angle sensor,
5 detector, 6 A / D converter (ADC),
7 CPU, 8 ROM, 9 RAM,
10 timer, 11 display / switch panel, 12
Sound source, 13 transmitter, 14 bus

Claims (4)

(57) [Claims] 1. A sensor for detecting a position change representing a joint operation, a stop event detecting means for detecting a timing of stopping a joint operation in accordance with a position change of the joint operation detected by the sensor, and the sensor Motion detecting means for detecting the motion of the joint before the stop timing detected by the stop event detecting means in accordance with the change in the position of the joint motion detected by the stop event; and the stop detected by the stop event detecting means A tone control device comprising: a tone generation instruction unit configured to instruct generation of an attenuation sound corresponding to a joint operation before a stop timing detected by the operation detection unit in accordance with a timing. 2. The motion detecting means according to claim 1, further comprising: a forward speed indicating a change in the position of the joint motion in a certain direction according to a change in the position of the joint motion detected by the sensor; Speed detecting means for detecting a negative direction speed indicating a change in the position of the joint motion of the joint motion, and detecting a maximum speed in the positive direction and a maximum speed in the negative direction of the joint motion before the stop timing is detected; 2. The musical sound according to claim 1, further comprising a comparing means for comparing the maximum speed in the positive direction and the maximum speed in the negative direction detected by the detecting means, and detecting a joint operation before the stop timing according to a result of the comparison by the comparing means. Control device. 3. The motion detecting means detects the motion speed at predetermined time intervals in accordance with a change in the position of the joint motion detected by the sensor, and the motion in a certain direction before the stop timing is detected. Counting means for counting the number of times a positive speed indicating a change in the position of the motion is detected, and counting the number of times a negative speed indicating a change in the position of the joint motion in a direction opposite to the direction is detected; A comparison means for comparing the number of times of detection of the speed in the positive direction and the number of times of detection of the speed in the negative direction detected by the counting means, and detects a joint operation before the stop timing according to a comparison result of the comparison means. 2. The musical sound control device according to 1. 4. A filter for detecting an operation speed in accordance with a change in the position of a joint operation detected by the sensor, and performing a low-pass filter process on a signal representing the detected operation speed, 2. The musical tone control device according to claim 1, wherein the motion detecting means detects the joint motion before the stop timing according to the motion speed filtered by the filter.