JPS63204298A - Musical sound controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a musical tone control device that detects a collision between a human body or an object and controls musical tones according to the state of the collision.

``Prior Art J'' In recent years, devices have been developed that control musical tones through the movements of the human body, achieving new performance effects that cannot be obtained with conventional musical instruments.

An example of this type of device has been developed that processes the output signal of an acceleration sensor attached to the human body or stick, detects the impact strength at the time of a collision, and controls the musical sound according to this impact strength. (Patent Application No. 61-259805)
, musical sounds such as hand claps and step-on-yocks with the floor?
This has achieved a transformative effect.

``Problems to be Solved by the Invention'' However, since the conventional dual device is configured to produce sound simply according to the strength of the impact,
The drawback was that the manner in which the sound changed was poor.

This invention was made in view of two consecutive circumstances.
It is an object of the present invention to provide a musical tone control device that can obtain extremely diverse musical tone changes in musical tone control based on impact detection.

"Means for Solving the Problem" In order to solve the above-mentioned problem, the first invention includes a sensor that outputs a signal according to a collision state, and a sensor that detects whether or not a collision has occurred based on the output signal of this sensor. a collision detection means for detecting; a motion detection means for detecting the characteristic of the motion of shaking; a musical tone signal generation means for generating a musical tone signal based on the detection result of the motion detection means; and a detection result of the collision detection means. and a control means for controlling the musical sound signal generation means based on the above-mentioned sound signal generation means, and in the second invention, a sensor for outputting a signal according to the collision state, and a control means for controlling the musical sound signal generation means based on the collision condition. The apparatus includes a state detection means for detecting a state, and a state corresponding control means for controlling musical tones based on the detection result of the state detection means.

1 Effect J In the first invention, a musical tone signal corresponding to the characteristic of the action of "shaking" is generated by the musical tone signal generating means, and the musical tone signal generating means is generated according to the detection result of the collision detecting means. controlled. In other words, the musical tones are controlled doubly by the action of "shaking" and the collision state.

In the second invention, the musical tone is controlled according to the state of the collision object detected by the state detecting means. As a result, the musical tone changes depending on the condition (hardness, mass, etc.) of the object to be collided.

"Embodiments" Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In the figure, 1 is an acceleration sensor, and a material having piezoelectric properties is used as a vibrator, and an acceleration signal Va (see Figure 2 (a)) from this vibrator corresponds to the acceleration.
is now output. This acceleration sensor 1 is housed in an elongated stick (as shown), and when a person holds and shakes the stick, an acceleration signal Va corresponding to the "shaking" action can be obtained. The output signal of the acceleration sensor 1 is supplied to each input terminal of an amplifier 2 and a control signal generation circuit 3.

The output signal of the amplifier 2 is supplied to a low-pass filter 5, where high-frequency components are cut, and then passed to a peak detection circuit 6.
supplied to Further, the output signal of the amplifier 2 is supplied to a bypass filter 7, where the low frequency component is cut, and then supplied to a peak detection circuit 8. The peak detection circuit 6.8 is a circuit that detects the peak of the output signal of the low-pass filter 5 and the bypass filter 7, respectively, and outputs a pulse signal when the peak is detected.

Reference numeral 9 denotes a monostable multi-by-break that is triggered by the output signal of the peak detection circuit 8, and outputs a pulse signal of a constant width (approximately 5 to 50 ms) every time it is triggered. The output pulse of this monostable multi-by-break 9 is supplied to one input terminal of an AND gate IO. The output signal of the peak detection circuit 6 is supplied to the other input terminal of the AND gate 10, and one input terminal of the AND gate 10 is an inverting input terminal. The output signal Sa of the AND gate IO is supplied to the control signal generation circuit 3.

The control signal generation circuit 3 detects the acceleration increase period, acceleration peak value, etc. based on the acceleration signal Va supplied from the acceleration sensor 1, and thereby extracts the characteristics of the "shaking" motion. Then, in response to the extracted operation, a control signal instructing the volume, attach period, decay period, etc. of the musical tone is created and supplied to the sound source 4. The sound source 4 generates a musical tone signal based on the supplied control signal. In addition, the control signal generation circuit 3
When the signal Sa is supplied from the AND gate 10, a control signal is not created and the sound generation process of the sound source 4 is not instructed.

Note that a device that detects the characteristics of a person's "shaking" motion using an acceleration sensor and generates musical sounds according to the characteristics of this motion is disclosed in Japanese Patent Application No. 61-280426 filed by the present applicant.
There is a number.

Next, the operation of this embodiment with the above configuration will be explained.

First, when a person holds and shakes a stick in which an acceleration sensor I is incorporated, the acceleration sensor I outputs an acceleration signal V1 corresponding to the "shaking" action, as shown in FIG. 2(A). Note that FIG. 2 shows the waveform of the acceleration signal Va when the stick is swung twice. Here, it is generally known that a person's shaking action is an action in which they are first swung in the opposite direction and then swung in the desired direction, as shown in Figure 2 (
Periods Ta and Tb shown in b) are the above-mentioned swing-out periods. Therefore, during the periods Ta and Tb, the acceleration signal Va is output in the negative direction.

Time 1 shown in FIG. is the start time of the swing in the positive direction in the first "swing" motion, and from this time t onwards, the acceleration signal Va increases in accordance with the swing speed. Next, at time t, the stick or the like that was being swung accidentally collided with a wall, desk, etc. When there is a collision in this way, the period of time until the contact between the stick and the wall stabilizes (
12 to t3), the acceleration signal Va includes high-frequency components as shown in the figure. After time t3, the acceleration signal Va rapidly decreases, swings once in the opposite direction, and then becomes 0. Then, after time t5, 2
An acceleration signal V2L corresponding to the second swing is output. In this second swing, there is no collision with a wall or the like, and the acceleration signal Va does not include high-frequency components.

When the acceleration signal Va changes as shown in FIG. 2 (A), the output signal of the low-pass filter 5 becomes as shown in FIG. 2 (B), and the harmonic components generated between times t2 and t3 are removed. . Then, the peak detection circuit 6 detects the time i4. when the output signal of the low-pass filter 5 reaches its peak. je
At this point, a pulse signal is output as shown in FIG.

On the other hand, the output signal of the bypass filter 7 is
As shown in the figure, only the harmonic components included at times t to t3 are extracted and output. Then, the peak detection times [
8 outputs a trigger pulse to the monostable multivib break 9 at the time when the output signal of the bypass filter 7 reaches its peak. As a result, the monostable multi-by-break 9 outputs a pulse signal of a predetermined width at approximately the same time as time t4, as shown in FIG. 2(e). As a result, the AND gate IO is activated at time t6
An output signal Sa is output at.

Then, the control signal generation circuit 3 generates a musical tone control signal only at time t6 when the signal Sa is supplied from the AND gate 10, and at time L4 when the signal Sa is not supplied from the AND gate 10, the "shake" operation is not performed. However, musical tone control signals are not created. Therefore, as shown in FIG. 2 (g), a musical tone is emitted only when there is no collision in the shaking motion.

In this way, the reason why musical sound is not generated when a collision occurs is that
This is because colliding with something, such as a hand or a stick, in the process of "shaking" is generally a mistake, and this is to prevent unexpected sounds from being produced when a collision occurs. In this manner, according to the above-described embodiment, musical tones are controlled by detecting not only "shaking" motions but also collisions, so that a variety of performance effects can be achieved.

On the other hand, there are cases where it is desired to intentionally hit a stick or the like incorporating the acceleration sensor 1 against a wall, desk, etc., thereby creating a varied performance. In such a case, for example, when the signal Sa is not output from the AND gate 10, the control signal generation circuit 3 performs control to increase the sound output as shown in FIG. That's fine. If the control shown in FIG. 2 (H) is carried out, accents can be added arbitrarily by hitting something with a stick or the like, and more diverse performance effects can be obtained.

In addition, the acceleration sensor 1 is used exclusively for detecting the motion of swing J.
A sensor for detecting a collision (for example, an impact sensor, etc.) may be provided separately.

Next, other embodiments of the invention will be described.

FIG. 3 is a schematic configuration diagram showing the configuration of the stick 10 used in another embodiment of the present invention.

As shown in FIG. 3, the stick IO is formed into an elongated columnar shape, and an acceleration sensor 11 and an impact sensor 12 are provided inside the stick IO.

Further, a pressure-sensitive material 13 such as conductive rubber is attached to the outer periphery of the right side of the stick IO. person stick 1
0 and shake it, the acceleration sensor II outputs an acceleration signal vb corresponding to the swinging motion as shown in FIG. 4(a), and when the stick 10 collides with a fixed object 14 such as a desk, The impact sensor I2 outputs an impact signal Vc corresponding to the impact at the time of the collision, as shown in FIG. 4(c). In this case, the frequency characteristics of the acceleration sensor II are set to a relatively low band so that it is insensitive to the high-frequency components that occur during a collision, and the impact sensor 12 is set to a band that detects only the high-frequency components that occur during an impact. has been done. Further, at the time of a collision, the pressure sensitive material 13 outputs a pressure signal Vd corresponding to the impact strength, as shown in FIG. 4(c). In this case, the pressure sensitive material 13 is configured to output pressure signals Vd of the same value for the same swing acceleration. In other words, even if the swing acceleration is the same, the way the pressure-sensitive material I3 is distorted will be different depending on whether the contact surface at the time of collision is wide or narrow. A signal Vd is output.

Next, FIG. 5 is a block diagram showing the electrical configuration of this embodiment, and the pressure output Vd of the above-mentioned impact sensor 12 is
After being amplified by an amplifier 20, the signal is supplied to bandpass filters 21, 22, and 23. Bandpass filters 21°22.23 are each 500 Hz
, I kHz, and 10 kHz are filters with center frequencies, and their output signals are analog/
It is adapted to be supplied to a digital converter 25°26.27.

The acceleration signal vb of the acceleration sensor 11 is amplified by the amplifier 30 and then supplied to the peak detection circuit 32, and the output signal Vd of the pressure sensor I3 is amplified by the amplifier 31 and then supplied to the peak detection circuit 33. The peak detection circuit 32 detects the peak value of the acceleration signal vb (see FB shown in FIG. 4(a)) and supplies it to the analog/digital converter 35. The peak detection circuit 33 detects the pressure signal V
The peak value of d (see FD shown in FIG. 4(c)) is detected and supplied to the analog/digital converter 36. 40 is a multiplex circuit, which cyclically selects any of the output signals of the analog/digital converters 25 to 27, 35, and 36 and supplies it to the control signal generation circuit 45. The control signal generation circuit 45 is composed of a CPU, a program memory, various interfaces, etc., and generates these signals based on the output signals of the analog/digital converters 25, 26, and 27 supplied via the multiplex circuit 40. The signal rises and then decays (
(approximately 1/10 of the maximum value) (duration),
That is, the period T shown in FIG. 6 (a), (b), and (c)
c,, Tcx, Te3, and the maximum peak value (peak-peak) of each signal Pc+, F C2
, Fc, , is detected. Then, the control signal generation circuit 45 generates the measured periods TC+, Tc2 . Tc3,
Maximum wave height value PCI, FC2°Fc3, and analog/
Based on the peak values FB and FD supplied via the digital converters 35 and 36 and the data in the judgment table 46, the state of the fixed object 14, that is, the hardness, mass, etc., is analyzed. It has become.

Here, the analysis processing of the control signal generation circuit 45 will be explained.

■If the maximum peak value FC1 of the output signal of the band-pass filter 21, which is the low-frequency component of the output of the impact sensor 12, is large, it is determined that the material of the fixed object 14 is soft, and the high-frequency component of the output of the impact sensor 12 is determined to be soft. If the maximum peak value FC3 of the output signal of a certain bandpass filter 23 is large, the fixed object 1
Processing is performed to determine that the material No. 4 is hard. In this process, maximum wave height values Pc, , Fc2 are stored in the determination table 46.
Conversion data indicating the relationship between each part of °Fc3 and the hardness of the fixed object I4 is prepared in advance, and the above processing is performed based on this conversion data.

■ Duration of the output signal of the bandpass filter 21 Tc+
is long, it is determined that the mass of the fixed object 14 is small, and when the duration of the output signal of the bandpass filter 23 is long, it is determined that the mass of the fixed object 14 is large. In this process as well, the periods Tc+, Te3, T
The relationship between each part of ea and the mass of the fixed object I4 is stored in the determination table 46, and the control signal generation circuit 4
5 is the fixed object 1 based on the data in the determination table 46.
Determine the mass of 4.

(2) The hardness of the fixed object 14 is detected based on the ratio between the peak value Fb of the acceleration signal vb and the peak value Fd of the pressure signal Vd. In this case, the pressure signal Vd is proportional to the speed of swinging, and the softer the fixed object 14 is, the smaller the value becomes. Therefore, by taking the ratio of the peak value Fb and the peak value Fd,
The hardness of the fixed object 14 can be determined. Also, judgment table 4
6, data indicating the relationship between the value of (Fb/Fd) and the hardness of the fixed object 14 is prepared in advance.

The above steps (1) to (2) are the state analysis processing of the fixed object 14 in the control signal generation circuit 45. Then, the control signal generation circuit 45 generates a control signal specifying the timbre, volume, type of musical instrument (flute, piano, etc.) according to the above analysis result, and supplies it to the sound source 4.

The sound source 4 generates a musical sound waveform corresponding to the instrument specified by the control signal, processes this waveform so that it has the specified volume and tone, and then supplies it to the speaker 47. Generates musical tones.

According to the above-described configuration, the peak values FD and F vary depending on the material, mass, etc. of the fixed object 14 to which the stick IO is hit.
Since CI to FC3 and the periods TO and -TC3 change in various ways, musical tones change in various ways.

Note that the control signal generation circuit 4 in the above embodiment
5 may be configured to perform any one of the analysis processes (1) to (2) described above.

"Effects of the Invention" As explained above, according to the first invention, there is provided a sensor that outputs a signal according to a collision state, a collision detection means that detects whether a collision has occurred from the output signal of this sensor,
a motion detection means for detecting the characteristics of the motion of "shaking";
The musical tone signal generation means for generating a musical tone signal based on the detection result of the motion detection means and the control means for controlling the musical tone signal generation means based on the detection result of the collision detection means are provided. The instrument is controlled in two ways by the "shake" action and the collision state, allowing extremely diverse musical tone control.

Further, in the second invention, there is provided a sensor that outputs a signal according to the collision state, a state detection means that detects the state of the object to be collided based on the sensor output signal, and a state detection means that detects the state of the object to be collided based on the detection result of the state detection means. Since the present invention is equipped with a state-adaptive control means for controlling the musical sound, the musical sound changes depending on the state (hardness, mass, etc.) of the object to be hit, and the musical sound can change in a variety of ways by changing the object to be hit. It will be done.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of one embodiment of the present invention, Fig. 2 is a waveform diagram showing waveforms of various parts of the circuit in the same embodiment, and Fig. 3 shows the configuration of the stick in another embodiment of the invention. 4 is a waveform diagram showing the output signal of the sensor used in the same embodiment. FIG. 5 is a block diagram showing the electrical configuration of the same embodiment. The bandpass filters shown are 21°22.
23 is a waveform diagram showing the output signal of No. 23. FIG. 1... Acceleration sensor, 3... Control signal generation circuit (motion detection means: musical tone signal generation means)
, 4... sound source (musical sound signal generation means), 7...
...Bypass filter (collision detection means), 8...
...Peak detection'-ml path (collision detection means), 10...
Mountain and gate (control means), 11...acceleration sensor (sensor), 12...impact sensor (sensor)
, 13... Pressure sensitive material (sensor), 21-22.
...Band pass filter (state detection means), 45
. . . Control signal generation means (state detection means: state corresponding control means), 46 . . . Judgment table (state detection means: state corresponding detection means).

Claims (8)

[Claims] (1) A sensor that outputs a signal according to the collision state, a collision detection means that detects whether a collision has occurred based on the output signal of this sensor, and a sensor that detects acceleration based on the output signal of the acceleration sensor. motion detection means for detecting a feature; musical tone signal generation means for generating a musical tone signal based on the detection result of the motion detection means; and control means for controlling the musical tone signal generation means based on the detection result of the collision detection means. A musical tone control device comprising: (2) The acceleration sensor is commonly used as the sensor, and the collision detection means detects a collision depending on whether or not the output signal of the acceleration sensor includes a high frequency component. The musical tone control device according to item 1. (3) The musical tone control device according to claim 1, wherein the control means stops the musical tone signal generation means from generating musical tone signals when the collision detection means detects a collision. (4) The control means controls the sound volume of the musical tone signal generated by the musical tone signal generating means to be increased when the collision detection means detects a collision. Musical tone control device. (5) A sensor that outputs a signal according to the collision state, a state detection means that detects the state of the object to be collided based on the sensor output signal, and a state that controls the musical tone based on the detection result of this state detection means. A musical tone control device comprising a corresponding control means. (6) The sensor is an impact sensor that detects vibration components generated during a collision, and the state detection means divides the output signal of the impact sensor into a plurality of frequency bands, and based on the amplitude value of the signal in each frequency band. 6. The musical tone control device according to claim 5, wherein the musical tone control device detects the state of the object to be collided with. (7) The sensor is an impact sensor that detects vibration components generated during a collision, and the state detection means divides the output signal of the impact sensor into a plurality of frequency bands, and based on the duration of the signal in each frequency band. 6. The musical tone control device according to claim 5, wherein the musical tone control device detects the state of the object to be collided with. (8) The sensor includes an acceleration sensor that detects acceleration and a pressure sensor that detects pressure in a collision, and the state detection means detects the collision based on the ratio of the output peak value of the acceleration sensor and the output peak value of the pressure sensor. 6. The musical tone control device according to claim 5, wherein the musical tone control device detects the state of an object.