JP3664086B2 - Electronic instrument touch response device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a touch response device for an electronic musical instrument that is used for controlling musical tones according to performance intensity or the like in a performance operation unit or the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in an electronic keyboard instrument or the like, an after touch signal corresponding to a key pressing pressure at the time of key pressing is detected by an after touch sensor, and various musical tone elements such as a volume are controlled by the after touch signal. . However, since the after touch signal includes a high-frequency signal unsuitable for the after touch in the initial touch component immediately after the key is pressed, the musical tone is affected as it is. Therefore, a technique for connecting a low-pass filter to an after-touch sensor and using the output of this low-pass filter as an after-touch signal is disclosed in Japanese Utility Model Publication No. 58-55429.
[0003]
[Problems to be solved by the invention]
Since the component unsuitable for the aftertouch is a relatively high frequency signal, it is necessary to use a strong low-pass filter. However, when a strong low-pass characteristic filter is used, there is a problem that the followability of aftertouch is impaired and the operability and performance of aftertouch are deteriorated.
[0004]
An object of the present invention is to remove components unsuitable for aftertouch from initial touch components of an output signal of an aftertouch sensor or the like, and to improve operability and performance of aftertouch.
[0005]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a touch response device for an electronic musical instrument, a performance signal input means, a touch signal generation means for generating a touch signal from the performance signal input means, and a high-frequency component of the touch signal by inputting the touch signal. A noise removal filter means for performing a filtering process to remove the noise, a filter coefficient control means for controlling a coefficient of a noise removal degree of the noise removal filter means according to an elapsed time from a rise of a signal from the performance signal input means, A touch response device for an electronic musical instrument comprising: the filter coefficient control means loosening the degree when the elapsed time is large.
[0006]
According to the touch response device for an electronic musical instrument of the first aspect, when the elapsed time from the rise of the signal (for example, touch signal) from the performance signal input means is large, the degree of noise removal with respect to the touch signal becomes loose. High-frequency components (components unsuitable for aftertouch) can be removed from the initial touch component of the signal (components immediately after the start-up), and the followability of the aftertouch can be improved. Become. The “signal from the performance signal input means” may be a key-on signal.
[0007]
A touch response device for an electronic musical instrument according to a second aspect of the present invention includes a performance signal input means, a touch signal generation means for generating a touch signal from the performance signal input means, and an initial touch of the touch signal by inputting the touch signal. Noise removing filter means for performing filtering processing to remove components unsuitable for aftertouch in the components and outputting, counting means for counting elapsed time from the rise of the signal from the performance signal input means, and from the elapsed time zero And a filter management control unit that performs the filtering process by the noise removing filter unit until the count unit detects a short predetermined value, and thereafter does not perform the filtering process.
[0008]
According to the touch response device for an electronic musical instrument of the second aspect, the elapsed time from the rise of the signal (for example, touch signal) from the performance signal input means is counted, and a predetermined value short from zero of this elapsed time is counted and detected. The components that are not suitable for aftertouch can be removed from the initial touch components, and since this filter processing is not performed after that, the followability of aftertouch can be improved, and the operability and performance of aftertouch are good. Become. In addition, since it is only necessary to switch between the case where the noise removal filter means performs the filtering process and the case where the filtering process is not performed, the control becomes simple.
[0009]
According to a third aspect of the present invention, there is provided a touch response device for an electronic musical instrument, a performance signal input means, a touch signal generation means for generating a touch signal from the performance signal input means, and an initial touch of the touch signal by inputting the touch signal. Noise removal filter means for performing filtering processing to remove components unsuitable for aftertouch in the components and outputting, counting means for counting the elapsed time from the rise of the signal from the performance signal input means, and the value of the counting means And a filter coefficient control means for controlling a coefficient of the noise removal degree of the noise removal filter means, wherein the filter coefficient control means loosens the degree according to the elapsed time. It was made to do.
[0010]
According to the touch response device for an electronic musical instrument according to the third aspect, the elapsed time from the rise of the signal (for example, touch signal) from the performance signal input means is counted, and the degree of noise removal becomes loose according to this elapsed time. From the initial touch component of the touch signal, a component unsuitable for aftertouch can be removed, and the followability of subsequent aftertouch can be improved, and the operability and performance of aftertouch are improved.
[0011]
According to a fourth aspect of the present invention, there is provided a touch response device for an electronic musical instrument, a performance signal input means, a touch signal generation means for generating a touch signal from the performance signal input means, and an initial touch of the touch signal by inputting the touch signal. A noise removing filter means for performing a filtering process to remove a component unsuitable for aftertouch in the component and outputting; a counting means for counting an elapsed time from a rising edge of the signal from the performance signal input means; and the elapsed time is predetermined. Filter switching means for switching the noise removal filter means from a strong filter to a weak filter when the value is a value.
[0012]
According to the touch response device for an electronic musical instrument according to the fourth aspect, the elapsed time from the rise of the signal (for example, touch signal) from the performance signal input means is counted, and when this elapsed time is a predetermined value, the strong filter (strong Since it can be switched from a low-pass characteristic filter to a weak filter (weak low-pass characteristic filter), components that are not suitable for aftertouch can be removed from the initial touch components before switching, and aftertouch tracking after switching is also possible. This improves the operability and performance of aftertouch. Further, in the noise removal filter means, it is only necessary to switch from the strong filter to the weak filter, so the control becomes simple.
[0013]
The performance signal input means is a keyboard device, the touch signal is a touch signal corresponding to the driving force for driving the key of the keyboard device, or the touch signal is a touch signal from an after sensor attached to the keyboard device, or the after sensor is The pressure sensor or the after sensor can be configured as a piezo sensor or the like.
[0014]
That is, a keyboard input means composed of a plurality of keys, a touch signal generation means for generating a touch signal from the keyboard input means, and a filter process for removing the high frequency component of the touch signal by inputting the touch signal and outputting it A touch response device for an electronic musical instrument, wherein the touch signal generation unit is stretched over a plurality of the keys, and each of the keys is stretched and biased. The touch signal may be generated by a sensor unit that detects a bias of the unit, and a high frequency component at the time of a bias due to a key operation of the extension unit may be removed by the noise removal filter unit.
[0015]
When the keyboard device having such a configuration is employed, the tensioning means of the touch signal generating means is stretched over a plurality of keys, and each of the keys is tensioned and biased, and this deviation is detected by the sensor means. A touch signal is generated. Accordingly, the touch signal generation means has a common structure for a plurality of keys, and the number of components is small, and the sensor can be easily adjusted. Further, the tensioning means may be a string-like member in which a portion corresponding to the key is biased in a direction perpendicular to the tensioning direction by the operation of the key. With such a configuration, the following effects can be obtained. As for the string-like member, the part corresponding to the key is biased in the direction perpendicular to the tensioning direction (the arrangement direction of the plurality of keys) by the operation of the key, so the end of the string-like part is in the tensioning direction (due to the tension) Move to. Since the amount of movement of this end is very small compared to the amount of deviation of the part corresponding to the key, it is suitable to use a piezo sensor as the sensor means according to the configuration of claim 1. That is, since the amount of deviation of the part corresponding to the key can be detected with a small amount of movement of the end, a wide dynamic range can be obtained and the detection accuracy can be improved. The sensor means may be a pressure sensor. Furthermore, since the amount of movement of the end of the string-like member is very small, space is saved.
[0016]
Further, the performance signal input means may be an electronic wind instrument type input means, and the touch signal may be breath pressure data from an air outlet of the electronic wind instrument type input means or force data (embouchure) biting the air outlet.
[0017]
The performance signal input means may be an electronic string instrument type input means, and the touch signal may be, for example, bow speed or bow pressure data of a bowed string instrument.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, a keyboard device as “performance signal input means” in the embodiment will be described. In the following drawings, the player side of the keyboard device is referred to as the front, and the opposite side is referred to as the rear.
[0019]
7, 8, and 9 are a plan view, a right side view, and a left side view, respectively, of an electronic piano keyboard device according to an embodiment of the present invention. In this keyboard apparatus, the entire key is supported by the keyboard frame 100, and the keyboard frame 100 is supported by the shelf board 101. The key 40 is composed of a white key and a black key. Each key has a rotation center R40 in the vicinity of the contact point with the support portion by a support portion 41 extending in the front direction slightly behind the center of the keyboard frame 100. It is supported so that it can rotate in the vertical direction. The mass body 50 is supported by the keyboard frame 100 below the key 40. The mass body 50 extends substantially horizontally in the front-rear direction as a whole, and the tip of the support piece 102 is formed by a support piece 102 erected at a position near the front of the keyboard frame 100 and a recess 51 for receiving the support piece 102. It rotates as a rotation center R50.
[0020]
In order to maintain the engagement state between the distal end portion of the support piece 102 and the recess 51, a spring composed of a recess formed on one side of the mass body 50 on the back side of the recess 51 in the mass body 50. The locking part 52 is pressed. The spring locking portion 52 is formed by a rib having a constant width in the thickness direction of the mass body 50, and a thin plate portion extends vertically in the center portion of the rib in the width direction in the spring locking portion 52. The end portion of the S-shaped spring 42 that engages with the spring locking portion 52 has a bifurcated shape having a slit in the center, and the thin plate portion is inserted into the slit for engagement.
[0021]
The middle portion of the S-shaped spring 42 is in contact with the edge of the spring through hole 103 at the approximately center in the front-rear direction of the upper part of the keyboard frame 100, and the other end of the S-shaped spring 42 is a spring at the lower rear of the key. It is comprised so that the receiving part 43 may be pressed. As a result, the S-shaped spring 42 acts to press the mass body 50 against the distal end portion of the support piece 102 at the position of the recess 52 and to push down the rear portion of the mass body 50 from the rotation center R50.
[0022]
The front end portion of the mass body 50 is in contact with the lower end portion of the hanging piece 44 of the key 40, and is rotated in conjunction with the key when the key 40 is pressed. A switch board 60 is supported by the keyboard frame 100 near the lower part of the front end of the mass body 50, and a key switch 61 formed of dome-shaped rubber is fixed on the switch board 60. On the lower surface of the front portion of the mass body 50, a switch drive unit 53 having a pair of legs extending downward at a position corresponding to the key switch 61 is provided. The switch driving unit 53, the switch board 60, and the key switch 61 constitute a key pressing switch that senses the key pressing speed by using a conduction start time difference at the time of key pressing due to a difference between two contact distances in the key switch 61. ing.
[0023]
The mass body 50 extends to the rear portion of the keyboard frame 100 and is supported in the vicinity of the rear end portion by a felt stopper member 104 fixed on the keyboard frame 100 in the rest position (non-key-pressed state). When the key 40 is depressed, the mass body 50 moves from the rest position indicated by the solid line in FIGS. 8 and 9 to the key depression position indicated by the alternate long and short dash line. A stopper member 105 is held immediately behind the key 40 in the keyboard frame 100 and serves to stop the mass body 50 that has reached the key pressing position. The stopper member 105 covers the cushioning felt 105a with a protective sheet 105b, and the contact portion 54 at the rear end of the mass body 50 presses the buffering felt 105a through the protective sheet 105b. The cushioning felt 105a is usually configured by overlapping felts having different stiffnesses so as to provide a buffering action against a collision of the rear end portion of the mass body 50 and a reliable stop feeling with respect to the player's fingers. The mass body 50 is made of plastic from the front part to the vicinity of the rotation center R50, and is formed so that a metal bar extends from the rear part. The mass of the metal bar extending backwards causes inertia at the time of key depression. Causes resistance.
[0024]
A sensor device 70 is attached to the rear part of the keyboard frame 100. The sensor device 70 generally has a structure in which two tension members are supported on both sides of the keyboard. Of the two tension members, one tension member 71 is used for sensing, and is held between the cushioning felt 105a of the stopper member 105 and the protective sheet 105b and extends toward the front of the keyboard device. Yes. The other tension member 72 is for compensation provided in order to prevent a decrease in sensitivity of the tension member 71 for sensing due to a disturbance factor. The compensation tension member 72 extends in parallel with the sensing tension member 71 at a position slightly away from the stopper member 105 so as not to contact the mass body 50.
[0025]
A tension portion 70A supported by the keyboard frame 100 is provided outside the left end of the keyboard row. The tension portion 70 </ b> A includes a holding member 73 fixed to the keyboard frame 100 and a tension plate spring 74 attached to the holding member 73. The leaf spring 74 extends rearward from the holding member 73 and is then folded back to form a V shape. A small groove is formed at the free end of each leaf spring 74, and one end of each of the sensing tension member 71 and the compensation tension member 72. It supports to pull the part.
[0026]
A detection unit 80 supported by the keyboard frame 100 is provided outside the right end of the keyboard row. The detection unit 80 has a structure in which a detection leaf spring 82 extends from the detection circuit board 81. The detection leaf spring 82 is in the form of a leaf spring, the base end portion is fixed to the detection circuit board 81 with screws 88, 88, and the distal end portion is formed with a small groove to pull the end portion of the sensing tension member 71. I support it. A strain sensor 83 is attached near the base end of the detection leaf spring 82. In this example, the strain sensor 83 is configured using a piezo element. The detection circuit board 81 is provided with a circuit (not shown) for detecting an output signal from the strain sensor 83 and an adjustment element 84 for fine adjustment thereof. The circuit is further connected to a circuit (after-touch controller) described later. Further, the end of the compensation tension member 72 on the right side of the keyboard row is fixedly supported by the keyboard frame 100.
[0027]
In the sensor device 70, the following settings are further made. The tension plate spring 74 is stronger than the detection plate spring 82. Further, the tension member 72 for compensation has a higher tensile rigidity than the tension member 71 for sensing. That is, the compensation tension member 72 is fixedly supported at the right end by the keyboard frame 100 and pulled at the left end by the tension leaf spring 74 to be in a predetermined extended state. On the other hand, the sensing tension member 71 is held at the left end position in FIG. 7 together with the compensation tension member 72 and the tension plate spring 74 as a joint holding portion. Further, the right end is held at the free end of the detection leaf spring 82 so as to bend the detection leaf spring 82. Therefore, in order to stabilize the position of the left end in a state where the compensation tension member 72 is pulled, the tension force of the tension leaf spring 74 is increased so that the detection leaf spring 82 is not greatly bent. The tensile rigidity of the tension member 72 is increased.
[0028]
Next, the operation of this keyboard apparatus will be described. 8 and 9 show a pause state before key depression. When the key is pressed from this state, the key 40 rotates downward about the rotation center R40, and the hanging piece 44 pushes down the mass body 50. Accordingly, the mass body 50 rotates about the rotation center R50, and the switch driving unit 53 moves downward toward the key switch 61. The switch driving unit 53 of the mass body 50 is in contact with the key switch 61, turns on the key pressing switch, and operates the sound generation mechanism to generate sound. During this time, the mass body 50 raises the rear part from the rotation center R50. Immediately after the switch drive unit 53 comes into contact with the key switch 61, the abutment portion 54 at the rear end of the mass body 50 abuts against the stopper member 105, whereby the rotation of the mass body 50 and the key 40 is stopped. .
[0029]
The sensor device 70 operates as follows. When the key pressing force is increased or decreased in the key pressing state, the abutting portion 54 at the rear end of the mass body 50 changes the amount of bending of the stopper member 105, particularly the buffer felt 105a. The sensing tension member 71 is held between the buffer felt 105a of the stopper member 105 and the protective sheet 105b. Therefore, when the bending amount of the buffer felt 105a changes, the meandering amount of the sensing tension member 71 accompanying the bending also changes. When the amount of meandering increases, the distance between the ends of the sensing tension member 71 decreases, and accordingly, the bending of the detection leaf spring 82 increases. Therefore, the output of the strain sensor 83 increases. By picking up this output change, it is possible to detect a change in the pressing force applied to the key after the key is pressed. If the volume, sound quality, etc. are changed accordingly, after-touch control can be performed. By appropriately selecting the flexibility of the buffer felt 105a and the protective sheet 105b of the stopper member 105, the bending of the stopper member 105 due to each key pressing can be extended for sensing even when a plurality of keys are pressed. Reflecting on the meandering of the member 71, accurate aftertouch control can be performed.
[0030]
However, the extending member used in the sensor device is a long member straddling both ends of the keyboard row. Therefore, the change in length due to disturbance factors such as temperature and humidity after being attached to the keyboard device also becomes large. If the end of the tension member for sensing is fixed to the keyboard frame, the linear expansion coefficient of the tension member itself and the expansion coefficient of the keyboard frame itself disturb the distortion amount of the strain sensor due to disturbance factors. End up. Therefore, it is necessary to deal with these disturbance factors for accurate aftertouch control.
[0031]
The sensor device 70 of this embodiment uses two tension members, and a sensing tension member 71 is provided in parallel to the compensation tension member 72. The tension member 72 is stretched by applying the spring force of the tension plate spring 74 to the compensation tension member 72, and the sensing tension member 71 is the same as the compensation tension member 72 on the tension plate spring 74. In a state where one end is supported at the position, the sensing tension member 71 itself receives the spring force of the detection leaf spring 82. Therefore, even if a disturbance factor acts, the influence is absorbed by the compensating tension member 72, and the spreading to the sensing tension member 71 is prevented. That is, even if expansion heat is generated due to a temperature rise after being attached to the keyboard device, the support point by the tension plate spring 74 is moved by the amount of extension of the tension member. Since the amount of thermal expansion is the same between the compensation tension member 72 and the sensing tension member 71, one end is supported at the position of the tension leaf spring 74 moved by the extension of the compensation tension member 72. The sensing tension member 71 does not affect the other end of thermal expansion. This compensation action is similarly performed with respect to the influence of humidity between the compensation tension member 72 and the sensing tension member 71 having the same elongation rate due to humidity. Depending on the external force at the time of attachment, the tension length of the tension member may change. On the other hand, the influence can be reduced by increasing the tensile rigidity of the compensating tension member 72.
[0032]
Further, the sensing tension member 71 has a portion corresponding to the key that is biased in a direction perpendicular to the tension direction (a direction in which a plurality of keys are arranged) by operating the key. Moves in the tensioning direction (due to tension). Since the amount of movement of the end portion, that is, the amount of bending of the detection leaf spring 82 is very small compared to the amount of deviation of the portion corresponding to the key, it is suitable to use a piezo element as the strain sensor 83. That is, since the amount of deviation of the part corresponding to the key of the sensing tension member 71 can be detected by the slight amount of deflection of the detection leaf spring 82, a wide dynamic range can be obtained and the detection accuracy can be improved. Furthermore, since the amount of bending of the detection leaf spring 82 is very small, the space is saved.
[0033]
Next, each embodiment of the electronic musical instrument to which the present invention is applied will be described.
(First embodiment)
1st Embodiment is one Embodiment corresponding to Claim 2 and Claim 4, The correspondence of the below-mentioned component of a claim and 1st Embodiment, and a claim is as follows. The keyboard 1 corresponds to “performance signal input means”, the after touch sensor 9 corresponds to “touch signal generation means”, the strong low-pass filter 14 corresponds to “noise removal filter means”, and the timer & switching circuit 4 corresponds to “ The timer & switching circuit 4 and the selector 13 correspond to “filter management control means” (Claim 2) and “filter switching means” (Claim 4).
[0034]
FIG. 1 is a block diagram of the electronic musical instrument of the first embodiment. The electronic musical instrument of the first embodiment is a keyboard electronic musical instrument using the keyboard device (performance signal input means), and the keyboard (KB) 1 scans the key switch 61 corresponding to each key 40 of the keyboard device. A key scan circuit for outputting the key code data (KCD) of the corresponding key, the key-on signal (KON), and the time difference data of the key switch 61 from the output signal of the key switch 61. The key-on signal is a signal that becomes a high level when the key is pressed and becomes a low level when the key is released, and alternatively indicates a key-pressing event or a key-release event. The key-on signal and key code output from the keyboard 1 are input to the sound source 2, and the time difference data is input to the initial touch detection circuit 3. Further, the key-on signal is input to the timer & switching circuit 4.
[0035]
The initial touch detection circuit 3 generates an initial touch signal based on the time difference data input from the keyboard 1 and outputs the initial touch signal to the sound source 2 as a volume control signal. The sound source 2 performs time-division multiplexing processing on a plurality of channels (for example, 16 channels) so that a plurality of sounds can be generated substantially simultaneously, and is based on key code data and key-on signals input from the keyboard 1. The musical tone signals for the number of key presses are output to the effect control circuit 5. The effect control circuit 5 gives various effects described later to the tone signal input from the sound source 2 and outputs it to the D / A conversion circuit 6, and the tone signal converted into an analog signal by the D / A conversion circuit 6 is the amplifier 7. And the musical sound is generated at the speaker 8. Note that the initial touch detection circuit 3 also performs time-division multiplexing processing in the same manner as the sound source 2, and outputs an initial touch signal corresponding to each key depression to the sound source 2.
[0036]
The aftertouch sensor 9 is the strain sensor 83 and the detection circuit board 81, and outputs an aftertouch signal corresponding to the output of the strain sensor 83 to the A / D conversion circuit 10. The A / D conversion circuit 10 performs analog / digital conversion of the aftertouch signal and outputs the digital aftertouch signal to the threshold circuit (TH) 11 and the AND gate 12. The threshold circuit 11 outputs a high level signal as a detection signal to the timer & switching circuit 4 and the AND gate 12 when the aftertouch signal becomes equal to or higher than a predetermined level (a level that is low enough to detect rising). The AND gate 12 becomes conductive by a high level signal input from the threshold circuit 11 and outputs an aftertouch signal input from the A / D conversion circuit 10 to the selector 13.
[0037]
The timer & switching circuit 4 starts an internal timer by a high level signal from the threshold circuit 11, and after a predetermined time of, for example, 50 to 200 msec has elapsed since that time, the selector switching signal is set as a high level signal to the SB terminal of the selector 13. Output. When the signal input from the threshold circuit 11 becomes a low level signal, the selector switching signal is changed to a low level signal. When the selector switching signal at the SB terminal is a low level signal, the selector 13 outputs the after touch signal input from the AND gate 12 to the strong low-pass filter 14 from the output terminal A, and the selector switching signal at the SB terminal is a high level signal. In this case, the aftertouch signal input from the AND gate 12 is output from the output terminal B to the weak low-pass filter 15.
[0038]
The strong low-pass filter 14 and the weak low-pass filter 15 are digital filters having the characteristics described later. The output of the strong low-pass filter 14 and the output of the weak low-pass filter 15 are added by the adder circuit 16, and the added output is sent to the effect selector 17. Is output. Since the aftertouch signal for the adder circuit 16 is alternatively output from the strong low pass filter 14 or the weak low pass filter 15, the adder circuit 16 substantially functions as a multiplexer.
[0039]
The switching selection means 18 is a digital volume type operator or the like, and by the operation of the switching selection means 18, the outputs A to n of the effect selector 17 are selectively selected and any one of the outputs A to n is selected. A control signal is output to the effect control circuit 5. This control signal is, for example, various control signals such as volume control signal, tone color control signal, vibrato pitch control signal, vibrato depth control signal, tremolo pitch control signal, tremolo depth control signal, panning control signal, pitch bend control signal, etc. In accordance with these selected control signals, the effect control circuit 5 gives various effects to the musical tone signal (digital musical tone signal) from the sound source 2.
[0040]
With the above configuration, the circuit of the first embodiment operates as follows.
When a key depression event is detected by the keyboard 1, an initial touch signal is generated by the initial touch detection circuit 3 based on the time difference data corresponding to the key and output to the sound source 2. In addition, key code data and a key-on signal corresponding to the key are output to the sound source 2, and the sound source 2 generates a musical sound signal at a volume corresponding to the initial touch signal. Note that the sound source 2 generates a musical tone signal by a key code and an initial touch signal corresponding to each key press by a time division multiplexing process even for a plurality of key presses.
[0041]
On the other hand, the aftertouch signal output from the aftertouch sensor 9 is input to the AND gate 12 via the A / D conversion circuit 10. When the aftertouch signal rises, the AND gate 12 is turned on by the output of the threshold circuit 11, and the aftertouch. A signal is output to the selector 13. At the same time as the after touch signal rises, the timer & switching circuit 4 starts a timer and outputs a high level signal to the selector 13 as a selector switching signal after a predetermined time. However, the selector switching signal is a low level signal until the predetermined time elapses, and the selector 13 outputs the aftertouch signal input from the AND gate 12 to the strong low-pass filter 14 from the output terminal A.
[0042]
Therefore, the aftertouch signal is filtered by the strong low-pass filter 14 during the predetermined time, and the filtered aftertouch signal is output to the effect selector 17 via the adder circuit 16. The effect selector 17 outputs a control signal of any of the currently selected outputs A to n to the effect control circuit 5 in response to the aftertouch signal, and the effect control circuit 5 generates an effect corresponding to the control signal as a sound source. 2 is added to the musical tone signal. When a predetermined time elapses, the selector 13 switches to output the aftertouch signal from the output terminal B to the weak low-pass filter 15 by the high level signal from the timer & switching circuit 4. The filtered aftertouch signal is output to the effect selector 17 via the adder circuit 16. Then, the effect selector 17 outputs a control signal corresponding to the aftertouch signal to the effect control circuit 5 in the same manner as described above, and an effect corresponding to the control signal is given to the tone signal.
[0043]
As described above, the aftertouch signal supplied to the effect selector 17 is filtered by the strong low-pass filter 14 until a predetermined time elapses from the rise of the raw aftertouch signal (output of the A / D conversion circuit 6). After a lapse of a predetermined time, the weak low-pass filter 15 performs filtering. FIG. 2 is a characteristic diagram of the strong low-pass filter 14 and the weak low-pass filter 15. In the frequency band around 50 Hz, the strong low-pass filter 14 cuts the signal strongly, and the weak low-pass filter 15 is weaker than the strong low-pass filter 14. To cut. That is, the strong low-pass filter 14 is a filter having strong low-pass characteristics, and the weak low-pass filter 15 is a filter having weak low-pass characteristics.
[0044]
Here, the initial touch component of the after touch signal immediately after the key depression is a frequency band around 50 Hz, and the signal used for the after touch control is a band lower in frequency than the frequency band around 50 Hz. Therefore, the initial touch component is reliably removed from the aftertouch signal by the strong low-pass filter 14 for a predetermined time from the rising edge of the raw aftertouch signal, and after this predetermined time has elapsed, the characteristic is switched to the weak low-pass filter 15. The followability of the after touch signal is not impaired, and the operability of the after touch operation is not impaired.
[0045]
As indicated by the dashed arrows in FIG. 1, a key-on signal from the keyboard 1 is input to the timer & switching circuit 4, the earliest key-on event is detected by the timer & switching circuit 4, and the earliest key-on event is detected. A timer may be started by a key-on event. Then, after a predetermined time of, for example, 50 to 200 msec from the earliest key-on event, a selector switching signal (high level signal) is output to the SB terminal of the selector 13, and the filter processing for the after touch signal is weakened from the strong low-pass filter 14. You may make it switch to the low-pass filter 15. FIG. In this case as well, when the detection signal of the threshold circuit 11 becomes a low level signal, the timer & switching circuit 4 changes the output destination of the selector 13 to the strong low-pass filter 14 by changing the selector switching signal to a low level signal. Same as above.
[0046]
In the first embodiment, the weak low-pass filter 15 is used and the strong low-pass filter 14 is switched to the weak low-pass filter 15. Corresponding to claim 2 Then, the weak low-pass filter is eliminated and one output of the selector 13 is input to the adder circuit 16, and after the filter processing of the strong low-pass filter 14, the adder circuit directly does not perform the filter process on the aftertouch signal. 16 may be output to the effect selector 17 via 16.
[0047]
In FIG. 1, the part surrounded by the alternate long and short dash line can be constituted by a microcomputer and software.
[0048]
(Second Embodiment)
The second embodiment is an embodiment corresponding to claims 1 and 3, and the correspondence between the claims and later-described components of the first embodiment and the claims is as follows. The keyboard 1 corresponds to “performance signal input means”, the after touch sensor 9 corresponds to “touch signal generation means”, the low-pass filter 25 corresponds to “noise removal filter means”, and the timer counter 23 corresponds to “counting means”. The parameter calculation circuit 24 corresponds to “filter coefficient control means”.
[0049]
FIG. 3 is a block diagram of an electronic musical instrument according to the second embodiment. Elements similar to those in FIG. 1 are denoted by the same reference numerals as those in FIG. The electronic musical instrument of the second embodiment is also a keyboard-type electronic musical instrument using the keyboard device (performance signal input means), and key code data (KCD), key-on signal (KON), and time difference data are output from the keyboard 1. The The key code is input to the sound source 2, the time difference data is input to the initial touch detection circuit 3, and the key-on signal is input to the key-on trigger forming circuit 21. The key-on trigger forming circuit 21 forms a key-on trigger signal from the key-on signal and outputs it to the sound source 2 and the second key-on trigger forming circuit 22.
[0050]
The second key-on trigger forming circuit 22 detects an event in the earliest key-on trigger signal from among the plurality of time-division key-on trigger signals detected, and starts the timer counter 23 by detecting the earliest key-on trigger signal. To do. The timer counter 23 outputs the count value (count value) to the parameter calculation circuit 24 in real time. The parameter calculation circuit 24 calculates an f value (cutoff frequency) that is a coefficient of the noise removal degree of the low-pass filter 25 from the real-time count value, and sets the f value in the low-pass filter 25. Thereby, the f value of the low-pass filter 25 is changed at any time according to the count value. This f value becomes large (high frequency) as needed from the start of the count value. After a predetermined time of, for example, 50 to 200 msec has elapsed from the start, the f value of the weak low-pass filter similar to FIG. 2 is used, and thereafter this f value is fixed. .
[0051]
With the above configuration, when a key depression event is detected by the keyboard 1, the sound source 2 generates a musical sound signal by the initial touch signal from the initial touch detection circuit 3, the key code data from the keyboard 1, and the key-on signal. The second key-on trigger forming circuit 22 detects the earliest key-on trigger signal, and at the same time, the timer counter 23 is started, and the f value of the low-pass filter 25 changes at any time. That is, the aftertouch signal output from the aftertouch sensor 9 is first filtered by the low-pass filter 25 with a high degree of noise removal, and this degree gradually decreases. Therefore, the followability of the after touch signal is not impaired, and the operability of the after touch operation is not impaired. Since the operations of the effect selector 17, the switching selection means 18, and the effect control circuit 5 are the same as those in the first embodiment, detailed description thereof is omitted.
[0052]
The second key-on trigger forming circuit 22 can be in another form. For example, the earliest key-on trigger signal for only the melody key range in the keyboard split may be formed. Thereby, it is possible to deal only with a key-on event in the melody key range.
[0053]
Alternatively, a key-on trigger signal may be formed for all key events in the melody key range, and a trigger for recounting (resetting) may be applied to the timer counter 23 by each key-on trigger signal. The timer counter 23 at this time is a “retriggerable timer counter”. As a result, the f value of the low-pass filter 25 is reset to the initial value (f value corresponding to count value = 0) for each key event corresponding to all key events in the melody key range. The high frequency component in the initial touch component of the after touch signal can be removed corresponding to the key event.
[0054]
In FIG. 3, the part surrounded by the alternate long and short dash line can be constituted by a microcomputer and software.
[0055]
(Third embodiment)
The third embodiment is an embodiment corresponding to claims 2 and 4, and the correspondence relationship between the claims and the components described later of the third embodiment and the claims is as follows. The electronic wind instrument type input means 1 ′ corresponds to “performance signal input means”, the breath pressure detection sensor 33 corresponds to “touch signal generation means”, the strong low-pass filter 14 corresponds to “noise removal filter means”, and the timer && switching circuit 4 corresponds to "counting means", and timer & switching circuit 4 and selector 13 correspond to "filter management control means" (claim 2) and "filter switching means" (claim 4).
[0056]
FIG. 4 is a block diagram of an electronic musical instrument according to the third embodiment. Elements similar to those in FIG. 1 are denoted by the same reference numerals as those in FIG. The electronic musical instrument of the third embodiment is an electronic wind instrument using an electronic wind instrument type input means 1 'as a performance signal input means. The electronic wind instrument type input means 1 'includes a mouthpiece and a plurality of performance keys, and the fingering detection means 31 detects a combination of operation states of the plurality of performance keys, and this combination is an effective combination ( Key code data (KCD) corresponding to the combination is output. This key code data is output to the sound source 2 via the AND gate 32.
[0057]
Moreover, the mouthpiece of the electronic wind instrument type input means 1 'is as shown in FIG. 5, for example. The inside of the mouthpiece is hollow, and a blowing hole 1a for breathing is formed at the tip of the mouthpiece. A rubber film 1b is provided on the main body side of the mouthpiece, and a photo sensor 1c is provided on the back side of the rubber film 1b. It is arranged. In the vicinity of the rubber film 1b of the mouthpiece, an escape hole 1d for releasing the breath blown into the mouthpiece is formed. Thus, when breath is blown in from the blow hole 1a, the breath is appropriately taken out from the escape hole 1d, and a breath pressure is generated in the lumen of the mouthpiece, and the rubber film 1b is deformed in accordance with the breath pressure. The photo sensor 1c senses the deformation amount of the rubber film 1b. That is, the output of the photosensor 1c is input to the breath pressure detection sensor 33 in FIG. 4, and the breath pressure detection sensor 33 outputs an aftertouch signal corresponding to the breath pressure.
[0058]
The aftertouch signal output from the breath pressure detection sensor 33 is output to the threshold circuit (TH) 11 and the AND gate 34. The threshold circuit 11 has a predetermined level (about the level of rising detection) as in the first embodiment. When the signal level is higher than (low level), the detection signal is output as a high level signal to the AND gate 32, the AND gate 34, the sound source 2, and the timer & switching circuit 4. The AND gate 34 is turned on by a detection signal (high level signal) input from the threshold circuit 11 and outputs an aftertouch signal input from the breath pressure detection sensor 33 to the selector 13. The detection signal of the threshold circuit 11 is also input to the sound source 2 as a key-on signal, and the sound source 2 generates a musical sound using this key-on signal as a trigger.
[0059]
The timer & switching circuit 4, the selector 13, the strong low-pass filter 14, the weak low-pass filter 15, and the addition circuit 16 are the same as those in the first embodiment, and when the threshold circuit 11 detects the rising edge of the aftertouch signal, An internal timer is started in the timer & switching circuit 4 by the high level signal from the threshold circuit 11, and the output destination of the selector 13 is strongly low-passed by a selector switching signal (high level signal) after a predetermined time of 50 to 200 msec, for example. The filter 14 is switched to the weak low-pass filter 15. Then, the after touch signal filtered by the strong low pass filter 14 or the weak low pass filter 15 is output to the effect control circuit 5 via the adder circuit 16, and the effect control circuit 5 performs, for example, pitch bend or the like by the after touch signal. Be controlled.
[0060]
As described above, the after-touch signal supplied to the effect control circuit 5 is filtered by the strong low-pass filter 14 until a predetermined time elapses from the rising edge of the raw after-touch signal, and after the predetermined time elapses, the weak low-pass filter 14 Since the filter processing is performed by the filter 15, the initial touch component (component immediately after rising) is surely removed from the aftertouch signal, and the followability of the aftertouch signal after a predetermined time has passed, as in the first embodiment. The operability of the aftertouch operation is not impaired.
[0061]
The timer & switching circuit 4 in the embodiment can be constituted by a delay circuit 4a and an AND circuit 4b as shown in FIG. 6A, for example. The delay circuit 4a sequentially shifts the detection signal (high level signal / low level signal) input from the threshold circuit 11 with a predetermined shift clock, and delays the detection signal by a predetermined time of, for example, 50 to 200 msec. The AND circuit 4b receives the delayed detection signal and the real-time detection signal, and outputs the output signal of the AND circuit 4b to the SB terminal of the selector 13 as a selector switching signal. That is, the predetermined time in this case is set by the cycle of the shift clock and the number of shift stages. Then, as shown in FIG. 6B, a predetermined time is from when the high level signal is input to the threshold circuit 11 until the high level signal is output from the delay circuit 4a. Is selected. The weak low-pass filter 15 is selected from when the high-level signal is output from the delay circuit 4a to when the low-level signal is input from the threshold circuit 11.
[0062]
In the above embodiments, examples of the keyboard device and the electronic wind instrument type input means have been described as the performance signal input means. However, as the performance signal input means, an electronic musical instrument (for example, a physical model sound source) that simulates a bowed instrument such as a violin or a viola. The electronic string instrument type input means of the electronic string instrument) is used, and the bow speed or bow pressure signal data obtained from the electronic string instrument type input means is used as an after touch signal, and the after touch signal is processed in the same manner as in the above embodiments. You may give it.
[0063]
When a keyboard device is used as the performance signal input means, the keyboard device includes an after touch sensor corresponding to each key, and the same filter processing as described above may be performed on the after touch signal corresponding to each key. Good. However, the keyboard device in the first embodiment and the second embodiment is more preferable as the keyboard device. According to the sensor device 70 of the keyboard device in the first embodiment and the second embodiment, as described above, by using the two tension members, the sensing tension member 71 and the compensation tension member 72, A special effect is obtained in that the influence of disturbance factors such as humidity changes can be reduced, but there are other effects as well. That is, if an after touch sensor is provided corresponding to each key, there is a problem that the number of parts increases, and it is difficult to adjust the variation among a plurality of sensors. However, according to the keyboard device of the embodiment, the number of components is small and the adjustment of the sensor is easy. Therefore, the assembly process is simplified, the cost is reduced, and high performance can be secured.
[0064]
【The invention's effect】
As described above, according to the touch response device for an electronic musical instrument according to any one of the first to fourth aspects, the high frequency component (component unsuitable for aftertouch) is removed from the initial touch component (component immediately after rising) of the touch signal. In addition, it is possible to improve the follow-up performance of the subsequent aftertouch, and the operability and performance of the aftertouch are improved.
[0065]
According to the touch response device for an electronic musical instrument according to the second aspect of the present invention, it is only necessary to switch between the case where the filter processing is performed by the noise removing filter means and the case where the filter processing is not performed, so that the control becomes simple.
[0066]
According to the touch response device for an electronic musical instrument according to the fourth aspect of the present invention, the noise removal filter means only needs to be switched from the strong filter to the weak filter, so that the control becomes simple.
[Brief description of the drawings]
FIG. 1 is a block diagram of an electronic musical instrument according to a first embodiment of the present invention.
FIG. 2 is a characteristic diagram of a strong low-pass filter and a weak low-pass filter according to an embodiment of the present invention.
FIG. 3 is a block diagram of an electronic musical instrument according to a second embodiment of the present invention.
FIG. 4 is a block diagram of an electronic musical instrument according to a third embodiment of the present invention.
FIG. 5 is a diagram showing an example of a mouthpiece in a third embodiment of the present invention.
FIG. 6 is a circuit diagram showing an example of a timer & switching circuit according to the embodiment of the present invention.
FIG. 7 is a plan view of a keyboard device for an electronic piano according to an embodiment of the present invention.
FIG. 8 is a right side view of the electronic piano keyboard device.
FIG. 9 is a left side view of the electronic piano keyboard device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Keyboard (performance signal input means), 2 ... Sound source, 4 ... Timer & switching circuit (counting means, filter switching means, filter management control means), 5 ... Effect control circuit, 9 ... After touch sensor (touch signal generation means) ), 11... Threshold circuit, 13... Selector (filter switching means), 14 .strong low-pass filter (noise removal filter means, strong filter), 15 .weak low-pass filter (weak filter), 23 .timer counter (counting means), 24 ... parameter calculation circuit (filter coefficient control means), 25 ... low pass filter (noise removal filter means), 1 '... electronic wind instrument type input means (performance signal input means), 33 ... breath pressure detection sensor (touch signal generation means) , 40 ... key, 41 ... support part, 42 ... S-shaped spring, 50 ... mass body, 53 ... switch drive part, 54 ... contact part, DESCRIPTION OF SYMBOLS 1 ... Key switch, 70 ... Sensor apparatus, 70A ... Extension part, 71 ... Sensing extension member, 72 ... Compensation extension member, 73 ... Holding member, 74 ... Extension spring, 80 ... Detection part, DESCRIPTION OF SYMBOLS 81 ... Circuit board for detection, 82 ... Leaf spring for detection, 83 ... Strain sensor, 100 ... Keyboard frame, 105 ... Stopper member, 105a ... Felt for buffer, 105b ... Protective sheet

Claims (4)

Performance signal input means;
Touch signal generation means for generating a touch signal from the performance signal input means;
Noise removal filter means for inputting the touch signal and performing filtering processing to remove a high-frequency component of the touch signal;
Filter coefficient control means for controlling the coefficient of the noise removal degree of the noise removal filter means according to the elapsed time from the rise of the signal from the performance signal input means;
An electronic musical instrument touch response device comprising:
The touch response device for an electronic musical instrument, wherein the filter coefficient control means relaxes the degree when the elapsed time is long. Performance signal input means;
Touch signal generation means for generating a touch signal from the performance signal input means;
Noise removing filter means for inputting the touch signal and performing a filtering process to remove a component unsuitable for aftertouch in the initial touch component of the touch signal;
Counting means for counting the elapsed time from the rise of the signal from the performance signal input means;
A filter management control means for controlling the noise removal filter means to perform the filter process until the short predetermined value of the counting means is detected from zero after the elapsed time, and thereafter not performing the process;
A touch response device for an electronic musical instrument, comprising: Performance signal input means;
Touch signal generation means for generating a touch signal from the performance signal input means;
Noise removing filter means for inputting the touch signal and performing a filtering process to remove a component unsuitable for aftertouch in the initial touch component of the touch signal;
Counting means for counting the elapsed time from the rise of the signal from the performance signal input means;
Filter coefficient control means for controlling the coefficient of the noise removal degree of the noise removal filter means according to the value of the counting means;
An electronic musical instrument touch response device comprising:
The touch response device for an electronic musical instrument, wherein the filter coefficient control means loosens the degree according to the elapsed time. Performance signal input means;
Touch signal generation means for generating a touch signal from the performance signal input means;
Noise removing filter means for inputting the touch signal and performing a filtering process to remove a component unsuitable for aftertouch in the initial touch component of the touch signal;
Counting means for counting the elapsed time from the rise of the signal from the performance signal input means;
Filter switching means for switching the noise removal filter means from a strong filter to a weak filter when the elapsed time is a predetermined value;
A touch response device for an electronic musical instrument, comprising:

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