JPH0954578A - Musical tone controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to instruct the formation of the musical tones meeting the operator's joint actions by exactly detecting these joint actions. SOLUTION: This controller has operating elements 1L, 1R, angle sensors 2L, 2R, 3R, 4L, 4R, etc. These grip operating elements 1L, 1R are the operating elements to be gripped by the player's right and left hands. Wrist sensors 2L, 2R detect the left and right wrist angles, elbow sensors 3L, 3R the left and right elbow angles and shoulder sensors 4L, 4R the left and right shoulder angles. The timing for stopping the joint action is detectable by investigating the change in the positions of the joint actions. The kinds of the joint actions before the stop timing are detectable as well and therefore, whether, for example, the bending action is stopped or elongating action is stopped is known. The instruction of the formation of the different musical tones is made possible by whether, for example, the stop of the bending action or the stop of the elongating action when the stop timing is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a musical tone control device which detects a movement of a player's body and controls a musical tone parameter for generating a musical tone.

[0002]

2. Description of the Related Art There is known a tone control device which detects movements of joints such as wrists and elbows of a player and controls various tone parameters. The motions of joints are mainly "bending" and "stretching". When the performer starts the bending motion and then stops the bending motion, a musical tone of a predetermined pitch (or tone color) is produced when the bending motion is stopped. On the contrary, when the player extends the joint and stops the extension motion at a certain position, a musical tone of another pitch (or tone color) is produced when the player stops. That is, two types of pitches or timbres can be generated by performing "bending" and "stretching" operations for one joint.

FIG. 8 is a graph for explaining the control method of the conventional tone control apparatus. The horizontal axis represents time, and the vertical axis represents joint angle. The angle of the joint is detected by an angle sensor attached to the joint of the player. An angle of 0 ° means that the joint is fully extended. The larger the angle, the greater the bending of the joint.

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

The area ER2 is an area having an angle smaller than the angle XL and is an area in which the stop of the stretching operation can be detected. In region ER2, when stop timing SR of the stretching operation is detected, a musical tone of a pitch (or tone color) corresponding to the stretching operation is sounded.

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 region ER0, even if the bending operation is stopped or the stretching operation is stopped, no musical sound is produced.

[0007]

When the bending motion is stopped in the joint angle region ER1, the conventional tone control device can generate a tone corresponding to the bending motion, and stops the extending motion in the joint angle region ER2. Then, a musical tone corresponding to the extending motion can be pronounced. In the joint angle region ER0, no musical sound is produced even if the joint motion is stopped.

When the musical tone control device is applied to an electronic musical instrument such as a drum, it may be desired to alternately generate two different types of tones. At that time, if the performer tries to perform a quick motion, the motion of bending and extending the joint in small increments is likely to be repeated. As a result, the angle changes in small increments in the angle region ER0. However, in the joint angle area ER0, even if such joint movement is performed, no sound is produced contrary to the intention of the player.

An object of the present invention is to provide a musical tone control device capable of accurately detecting a joint motion of a player and instructing the generation of a musical sound corresponding to the joint motion.

[0010]

SUMMARY OF THE INVENTION A musical tone control apparatus according to the present invention includes a sensor for detecting a position change representing a joint motion, and a joint motion stop timing according to the position change of the joint motion detected by the sensor. A stop event detecting means for detecting the motion of the joint, a motion detecting means for detecting the motion of the joint before the stop timing detected by the stop event detecting means in response to a position change of the joint motion detected by the sensor, and a stop And a sounding instructing unit for instructing the generation of an attenuation sound corresponding to the joint motion before the stop timing detected by the motion detecting unit according to the stop timing detected by the event detecting unit.

[0011]

By detecting the change in the position of the joint motion, the stop timing of the joint motion can be detected. 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 motion is stopped or the stretching motion is stopped. When the stop timing is detected, it is possible to instruct generation of different musical sounds depending on whether the bending operation is stopped or the stretching operation is stopped.

[0012]

1 is a block diagram of an electronic musical instrument to which a musical tone control apparatus 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 wound around the waist of the performer and includes detectors 5L and 5R and an A / D converter (AD).
C) 6L, 6R, CPU 7, ROM 8, RAM 9, timer 10, display / switch (SW) panel 11, sound source 1
2, having a transmitter 13 and a bus 14.

The grip operators 1L and 1R are operators that can be gripped by the player's left and right hands, respectively, and have switch-operable grip keys. Detector 5L, 5R
Respectively detect the states of the switches of the grip operators 1L and 1R.

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

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

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

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

The timer 10 counts time and informs the player of the timing of detecting the joint angle of the performer. The display / switch panel 11 has a switch for setting sound source parameters such as tone color and effect, 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. RAM9 is a working memory of the CPU7,
It has registers and buffers.

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

The CPU 7 calculates the joint angle of the performer 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 motion of the joint has stopped, and the sound source 1
In order to instruct to generate the pitch (or tone color) corresponding to the joint 2, the tone parameter is output.

The sound source 12 receives the musical tone parameters from the CPU 7 and generates a musical tone signal necessary for actually producing a sound. The transmitter 13 can output the 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 player can produce musical tones by bending or extending the joints. Musical tones with different pitches or tones 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 tones are produced. The timing of sound generation is when the bending or stretching motion of the joint is stopped.

FIG. 2 is a graph for explaining the sounding timing of the electronic musical instrument of this embodiment. The horizontal axis represents time, and the vertical axis represents joint angle. The angle of the joint is detected by an angle sensor attached to the joint of the player. The smaller the angle, the more the joint is extended, and the larger the angle, the more bent the joint is.

The timing BD is a timing at which the player stops the bending operation of the joint, and at this timing, a tone or tone color tone corresponding to the bending operation is emitted. The timing SR is the timing at which the player stops the extension motion of the joint, and at this timing, the musical tone of the pitch or tone color corresponding to the extension motion is emitted.

In the prior art (FIG. 8), no sound is produced even when the joint motion is stopped at an angle between the threshold values shown by the two dotted lines. In the present embodiment, sound is produced even when the bending operation is stopped or the stretching operation is stopped in the angular region between the two dotted lines. That is, even when the bending and stretching motions of the joint are repeated in small increments, it is possible to alternately generate musical tones of two types of pitches or timbres. Musical notes of the same pitch or timbre can be continuously pronounced in a short period of time.

Next, a processing method for detecting the stop of the bending operation and the stretching operation will be described. FIG. 3 shows C of FIG.
It is a flowchart which shows the process of the main routine which PU7 performs.

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

At step SA2, grip key processing of the grip operator 1 is performed. The player can perform various settings by operating the grip key switch. The CPU 7 detects the state of the switch and switches the angle detection mode or the like.

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

At step SA5, angle sensor processing is performed. The angle sensor processing detects the angles of the wrist, elbow and shoulder joints, and controls the sound generation as necessary. 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 process is repeatedly performed at regular time intervals. FIG. 4 is a flowchart showing details of the angle sensor processing in step SA5 of FIG.

In step SB1, a right wrist angle detection process is performed. First, the time change of the angle of the right wrist is detected based on the resistance value detected by the right wrist sensor 2R.
The change in angle with time indicates the angular velocity. If the angular velocity is known, the bending motion, the stretching motion, and the stop of the bending / stretching motion of the joint can be detected. When the stop of the joint motion is detected, sound generation processing is performed. Details will be described later.

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

In steps SB3 and SB4, the left and right elbow angle detection processing 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 to control the sound generation.

In steps SB5 and SB6, the processing 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 to control the sound generation.

The angle sensor process is completed as described above, and the process returns to the process of the main routine of FIG. The processing of the above 6 steps does not necessarily have to be performed continuously, and each processing may be performed instead of at regular time intervals.

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

FIG. 5 is a flow chart showing a first example of the right elbow angle detection processing in step SB4 of FIG.
In step SC1, the data of the angle sensor is fetched,
Performs angle range normalization. Then, 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 time t.

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

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

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

EVR = {ER (t) -ER (t-dt)} / dt In step SC3, the angular velocity E is set using the threshold value VS.
Determine the VR range. 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 it is judged that the joint operation of the right elbow is in a stopped state, and the routine proceeds to step SC9. EV
When R ≦ −VS, the angular velocity EVR is a negative value, which means that the angle is smaller than before. The smaller angle means that the right elbow is being extended. In that case, step SC
Go to 4.

When EVR ≧ VS, the angular velocity EV
Since R is a positive value, it indicates that the angle is larger than before. A larger angle means that the right elbow is in the middle of a bending operation. In that case,
Go to step SC6.

Step SC4 is a process when the player extends the right elbow, and it is checked whether 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 register M
When it is smaller than IN, the value of the register MIN is updated, and therefore the process proceeds to step SC5. At step SC5, the angular velocity EVR is stored in the register MIN, and the routine proceeds to step SC8. The register MIN stores the smallest angular velocity of the past. Angular velocity EVR is register M
If it is not smaller than the value of IN, the register MIN is not updated and the process proceeds to step SC8.

Step SC6 is a process when the player bends the right elbow, and the angular velocity EVR is registered in the register M.
Check if it is greater than the value of AX. Register M
The initial value of AX is 0. The angular velocity EVR is the register MA
When it is larger than X, the value of the register MAX is updated, and therefore the process proceeds to step SC7. 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 of the past. Angular velocity EVR is register MAX
If it is not larger than the value of, the process proceeds to step SC8 without updating the register MAX.

In step SC8, the flag RUN is set to 1 to record that the player is in the process of extending or bending the right elbow, and then the process returns to the angle sensor process of FIG.

Step SC9 is a process when the joint operation of the player's right elbow is stopped, and the flag RUN is set.
Check whether is 1. When the flag RUN is not 1, it means that the joint motion is still stopped from before, so that the sound sensor process is not performed and the process returns to the angle sensor process of FIG.

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

At step SC10, the flag RUN is set to 0.
Set 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 the value of the register MP is smaller than the value of the register PP.
If 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 it is determined that the joint motion is in the direction in which the maximum angular velocity MAX is detected. That is, since it indicates that the joint motion is stopped after the bending motion is performed, 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, and therefore the minimum angular velocity M
It is determined that the joint motion is in the direction in which IN is detected. That is, since it indicates that the joint motion is stopped after the stretching motion is performed, the process proceeds to step SC13.

In step SC13, the value of the angular velocity register MP is stored in the velocity register VEL in order to perform the sounding process of the stretching motion, and the tone color corresponding to the stretching motion of the right elbow (the angular velocity is negative) is stored in the tone color register TC. Store. Then, it progresses to step SC15.

The velocity register VEL is a register for storing the magnitude of angular velocity. Tone register T
C stores different timbres for the stretching motion and the bending motion. The left and right elbows also store different tones, and the elbows, shoulders, and lists also store different tones. For example, drum sounds can be assigned to each joint movement.

In step SC14, the velocity register VEL stores the value of the angular velocity register PP in order to perform the bending operation sound generation processing, and the tone color register TC stores the tone color corresponding to the right elbow bending action (the angular velocity is positive). Store. Then, it progresses to step SC15.

In step SC15, it is checked whether the velocity register VEL is larger than the lower limit value.
When the value is smaller than or equal to the lower limit value, it is determined that the operation of the right elbow so far is detected by noise, and the sound sensor processing is not performed, and the processing returns to the angle sensor processing of FIG.

When the velocity register VEL is larger than the lower limit value, tone generation processing is performed, and therefore step SC1
Go to 6. In step SC16, the tone generator 12 is instructed to generate a musical tone controlled by the tone color TC and the velocity VEL. The sound source generates a musical tone signal of an attenuated tone corresponding to the tone color TC and the velocity VEL. For example, when the velocity VEL is large, a decaying sound with a fast rising is generated. The tone color TC is a tone color according to the direction of joint motion.

At step SC17, the registers MAX and MIN are cleared to 0 to prepare for the next sounding. Then, the process returns to the angle sensor process 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 extending 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. The direction is determined to be the motion direction of the joint. Therefore, even if there is an unstable element in the detection value of each time of the angle sensor, 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 of FIG.
At Step SD1, the data of the angle sensor is fetched,
Perform normalization. Then, the normalized data is stored in the angle register ER (t).

At step SD2, the angular velocity EVR is detected by the following equation based on the angle ER (t). 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 almost 0, so it is judged that the joint operation of the right elbow is in a stopped state, and the routine proceeds to step SD8. EV
When R ≦ −VS, the angular velocity EVR is a negative value, which means that the right elbow is being extended,
Go 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 performer is extending the right elbow, stores -1 in the code register ESR (t), and proceeds to step SD6.

Step SD5 is the processing when the performer is bending the right elbow, and is the code register ESR (t).
+1 is stored in and the process proceeds to step SD6. The sign register ESR (t) is -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 register ESR (i) at five times from t-4 to t are added. Note that registers other than 5 may be added.

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

Step SD8 is a process when the joint operation of the player's right elbow is stopped, and the flag RUN is set.
Check whether is 1. When the flag RUN is not 1, it means that the joint motion is still stopped from before, so that the sound sensor process is not performed and the process returns to the angle sensor process of FIG.

When the flag RUN is 1, it indicates that the extension operation of the right elbow has been stopped or the bending operation has been stopped. Therefore, the processing proceeds to step SD9 for 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 musical tone of a tone color corresponding to the sign of the numerical value of the register X among the tone colors assigned to the right elbow. The register X stores a value obtained by adding the signs of the past five angular velocities.

The value stored in the register X becomes a negative value when the number of times the angular velocity in the extending 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, it 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, the tone color corresponding to the extension operation of the right elbow is instructed, and if the value of the register X is a positive value, the tone color corresponding to the bending operation of the right elbow is instructed to the sound source 12. To be done. After instructing the sound source 12 to generate the attenuated sound of the timbre, the process returns to the angle sensor processing of FIG.

As described above, in the second processing example, among the angular velocities detected n times in the past at fixed time intervals, the number of angular velocities in the stretching direction and the number of angular velocities in the bending direction are compared, and the larger direction Is the joint movement direction. When the number of times in the extending direction is similar to the number of times in the bending direction and is 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 either number is sufficiently larger than the other,
The direction is pronounced as the motion direction.

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

In step SE2, the angular velocity EVR is detected by the following equation based on the angle ER (t). EVR = {ER (t) -ER (t-dt)} / dt In step SE3, low-pass filter processing 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 calculation of 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 threshold VS is used to determine the range of the filtered angular velocity EFR. Threshold V
S is a value slightly larger than 0 in consideration of noise.

When −VS <EFR <VS, the angular velocity EFR is almost 0, so it is determined that the joint operation of the right elbow is in a stopped state, and the process proceeds to step SE8. EF
When R ≦ −VS, the angular velocity EFR is a negative value, which means that the right elbow is being extended,
Go 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 processing when the performer is extending the right elbow, sets 0 in the flag EXR, and proceeds to step SE7.

Step SE6 is processing when the player bends the right elbow, sets 1 in the flag EXR, and proceeds to step SE7. The flag EXR is set to 0 when the right elbow is extended and set to 1 when the right elbow is bent.

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

Step SE8 is a process when the joint operation of the player's right elbow is stopped, and the flag RUN is set.
Check whether is 1. When the flag RUN is not 1, it means that the joint motion is still stopped from before, so that the sound sensor process is not performed and the process returns to the angle sensor process of FIG.

When the flag RUN is 1, it indicates that the extension operation of the right elbow has been stopped or the bending operation has been stopped. Therefore, in order to perform the tone generation processing, the process proceeds to step SE9.

In step SE9, the flag RUN is set to 0, and it is recorded that the right elbow is stopped.
In step SE10, the tone generator 12 is instructed to generate a musical 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 being low-pass filtered. The tone generator 12 indicates a tone color when the right elbow is extended when the flag EXR is 0 and a tone color when the right elbow is bent when the flag EXR is 1. After instructing the sound source 12 to generate the attenuated 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 low-pass filter processing on the detected angular velocity, so stable joint motion can be detected. In particular, even if the detected value of the angle sensor fluctuates abruptly, the fluctuation of the interpolation value is gradual, so that the stop of the operation can be reliably detected.

In this embodiment, when a stop event generated by stopping the joint motion is detected, it can be accurately detected whether the stop event is in the extension direction or the bending direction. .

Further, regardless of the angular range of the joint, it is possible to detect the stop event and perform sound generation processing in any angular range. When the performer repeatedly bends or extends the joints in small increments, two types of pitches or tone colors of musical tones are alternately produced, and a continuous striking performance can be performed.

Note that three processing examples are shown as stop event detection methods. Each of these processes can be appropriately switched by the grip operator 1 or the switch 11 shown in FIG. 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 it is possible to prohibit sounding due to unnecessary motion.

Further, the 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 performer 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, but instead, the relative position of the hand or arm is detected to detect the velocity of the joint operation. May be.

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 timing of stopping the joint motion and instruct generation of different musical sounds depending on the type of the joint motion.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an electronic musical instrument to which a musical sound 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 this embodiment.

FIG. 3 is a flowchart showing a process of a main routine performed by the CPU of FIG.

FIG. 4 is a flowchart showing details of angle sensor processing in step SA5 of FIG.

FIG. 5 is a flowchart showing a first example of a right elbow angle detection process of step SB4 of FIG.

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

FIG. 7 is a flowchart showing a third example of the right elbow angle detection processing in step SB4 of FIG.

FIG. 8 is a graph for explaining a control method of a musical sound control device according to a conventional technique.

[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 transmitters, 14 buses

Claims (4)

[Claims] 1. A sensor for detecting a position change representing a joint motion, a stop event detecting unit for detecting a joint motion stop timing according to a position change of the joint motion detected by the sensor, and the sensor. Motion detection means for detecting the motion of the joint before the stop timing detected by the stop event detection means according to the position change of the joint motion detected by the stop event detection means, and the stop detected by the stop event detection means. A tone control device having a sound generation instructing means for instructing the generation of an attenuated sound corresponding to the joint motion before the stop timing detected by the motion detecting means according to the timing. 2. The motion detecting means, in accordance with a position change of the joint motion detected by the sensor, moves in a positive direction indicating a position change of the joint motion in a certain direction and in a direction opposite to the direction. A velocity detecting means for detecting a velocity in the negative direction indicating a change in the position of the joint action, and detecting a maximum velocity in the positive direction and a maximum velocity in the negative direction of the joint action before the stop timing is detected; 2. The musical tone according to claim 1, further comprising a comparison unit that compares the maximum speed in the positive direction and the maximum speed in the negative direction detected by the detection unit, and detects the joint motion before the stop timing according to the comparison result of the comparison unit. Control device. 3. The motion detecting means detects the motion speed at a predetermined time interval according to the position change of the joint motion detected by the sensor, and the joint in a direction before the stop timing is detected. Counting means for counting the number of times the positive direction speed indicating the position change of the motion is detected and the number of times the negative direction speed indicating the position change of the joint motion in the 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 detecting the joint motion before the stop timing according to the comparison result of the comparison means. 1. The tone control device described in 1. 4. A filter for detecting an operation speed according to a position change 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 apparatus 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.