JP5707876B2 - Musical instrument - Google Patents

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JP5707876B2
JP5707876B2 JP2010250635A JP2010250635A JP5707876B2 JP 5707876 B2 JP5707876 B2 JP 5707876B2 JP 2010250635 A JP2010250635 A JP 2010250635A JP 2010250635 A JP2010250635 A JP 2010250635A JP 5707876 B2 JP5707876 B2 JP 5707876B2
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unit
virtual
space
resonance
signal processing
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JP2012103396A (en
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増田 英之
英之 増田
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ヤマハ株式会社
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Description

  The present invention relates to a technique for changing the sound quality of a musical instrument having a trunk.

  In a stringed instrument such as a guitar, the vibration of the string is transmitted to the trunk. The transmitted vibration resonates in the internal space of the torso, and the guitar produces sound with a sound quality corresponding to the shape of the torso. If the torso is small, the performer can easily carry the guitar, but the volume of the torso becomes small, so the volume of the low range is reduced. In particular, in the resonance characteristic of the trunk, two characteristic peaks and a dip sandwiched between them appear in a low frequency band, but the smaller the trunk, the higher the frequency of these two peaks and dip. .

  In addition, the phenomenon that the volume of the low frequency is insufficient is not limited to the case where the volume of the body is reduced, but the vibration of the picked string is forcibly transmitted to the body using an exciter to increase the volume. This is a problem even in a simple configuration. In Patent Document 1 using such a configuration, it is disclosed that a speaker for enhancing the volume of a low frequency band is fitted into the back plate of the body of the guitar.

JP 2002-539479 A

  In the technique disclosed in Patent Document 1, sound from a speaker fitted in the back plate is output in the player direction on the back plate side of the trunk. This sound is an electric signal obtained by picking up the vibration of the string and is output as a sound. Therefore, the vibration of the string is directly converted into a sound, and the resonance characteristic of the trunk is not reflected. That is, the sound as if playing an electric guitar is output from the speaker. In addition, the sound reflecting the resonance characteristics of the torso is heard from the sound hole of the torso, while the sound from the speaker is heard from the back plate side of the torso. There are few. Thus, even if a speaker is provided, the sound quality when the trunk is large is greatly different.

  The present invention has been made in view of the above circumstances, and even when the internal space of the resonance part to which the vibration of the vibrating body is transmitted is small, the sound quality is close to the resonance characteristic when the internal space of the resonance part is large. The purpose is to provide a musical instrument to play.

The present invention includes a resonance unit that transmits vibration of a vibrating body and resonates in an internal space, a microphone that converts a sound wave that reaches a boundary surface in a predetermined range of the resonance unit into an electric signal, and outputs the electric signal; Signal processing that provides an acoustic effect corresponding to the shape of a virtual resonance space that virtually extends from the boundary surface to the outside of the resonance portion and that corresponds to a sound wave that is incident and reflected on the virtual resonance space. A signal processing unit for performing the output electric signal; and a speaker for converting the electric signal subjected to the signal processing from the boundary surface toward the internal space and outputting the sound wave. An instrument characterized by

  In another preferred aspect, the electronic device further includes a howling suppression unit that performs a howling suppression process in accordance with a transfer function from the microphone to the speaker with respect to the electrical signal to be subjected to the signal processing. .

  In another preferred aspect, the howling suppression process is a signal process for suppressing an output level at a peak frequency of the transfer function among sound waves output from the speaker.

  In another preferred aspect, the howling suppression process is a signal process for shifting a phase of a sound wave output from the speaker so that an oscillation condition is not satisfied at a peak frequency of the transfer function.

Moreover, in another preferable aspect, the apparatus further includes an operation unit that receives an operation for designating a shape of the virtual resonance space, and the signal processing unit corresponds to a shape of the virtual resonance space designated by the accepted operation. Signal processing is performed on the output electrical signal.

  ADVANTAGE OF THE INVENTION According to this invention, even if the internal space of the resonance part to which the vibration of a vibrating body is transmitted is small, the musical instrument which can be sounded with the sound quality close | similar to the resonance characteristic when the internal space of a resonance part is large can be provided.

It is a figure explaining the structure of the guitar in 1st Embodiment of this invention. It is a block diagram explaining the structure of the signal processing part in 1st Embodiment of this invention. It is a figure explaining the shape of the virtual resonance space in 1st Embodiment of this invention. It is a block diagram explaining the structure of the acoustic effect provision part in 1st Embodiment of this invention. It is a figure explaining the structure of the guitar in 2nd Embodiment of this invention. It is a figure explaining the shape of the virtual resonance space in 2nd Embodiment of this invention. It is a block diagram explaining the structure of the acoustic effect provision part in 2nd Embodiment of this invention. It is a block diagram explaining the structure of the junction filter part in 2nd Embodiment of this invention. It is a block diagram explaining the structure of the acoustic effect provision part in the modification 1 of this invention. It is a figure explaining the structure of the conga in the modification 2 of this invention. It is a figure explaining the structure of the marimba in the modification 2 of this invention. It is a figure explaining the structure of the trombone in the modification 2 of this invention.

<First Embodiment>
[Appearance composition]
FIG. 1 is a diagram illustrating the configuration of a guitar 1 according to the first embodiment of the present invention. 1A is a view of the guitar 1 as viewed from the front, and FIG. 1B is a direction in which the virtual space providing unit 20 exists from the internal space of the trunk portion 10 in FIG. 1A (direction of arrow AR1). FIG.
A guitar 1 which is an example of a musical instrument of the present invention has a trunk portion 10. The body 10 is provided with a sound hole 12, a bridge 13, and a saddle 14. The vibration of the string 2 is transmitted through the saddle 14 that contacts the string 2 and the bridge 13 that supports the saddle 14, and the trunk 10 resonates in the internal space of the trunk 10. Thus, the trunk | drum 10 functions as a resonance part.

  The body portion 10 is provided with an operation portion 15. The operation unit 15 has an operation panel provided with a rotary switch, operation buttons, and the like. When an operation by the user is accepted, the operation unit 15 outputs information indicating the operation content. The operation unit 15 may be provided with a display unit that displays a menu screen or the like. The operation panel may further be provided with a slot portion into which a recording medium using a nonvolatile memory is inserted. Further, the side plate of the trunk portion 10 may be further provided with an input terminal for receiving an input of an audio signal from the outside. Further, the operation unit 15 may not be provided on the guitar 1.

  The body part 10 is provided with a virtual space giving part 20. The virtual space providing unit 20 includes a microphone 30, a speaker 40, and a signal processing unit 100. The virtual space imparting unit 20 is connected to the boundary surface CA in a predetermined range in the trunk unit 10, and the microphone 30 and the speaker 40 are provided so as to face the boundary surface CA. The microphone 30 converts the sound wave that reaches the boundary surface CA into an electrical signal and outputs it. The signal processing unit 100 performs signal processing that gives a predetermined acoustic effect on the electrical signal output from the microphone 30 and outputs the signal. The speaker 40 converts the electric signal output from the signal processing unit 100 into a sound wave and outputs the sound wave toward the internal space of the trunk portion 10 from the boundary surface CA.

  As shown in FIG.1 (b), in this example, the microphone 30 is provided in the center part of the boundary surface CA. One speaker 40 is provided on each side of the microphone 30. A plurality of microphones 30 may be provided. A larger number of speakers 40 may be provided, or only one speaker 40 may be provided, but the ratio of the vibration surface of the speaker 40 to the area of the boundary surface CA is increased. It is desirable that Further, the shape of the vibration surface of the speaker 40 is not limited to a circle but may be a rectangle.

The guitar 1 is a space in which a virtual space (hereinafter referred to as a virtual resonance space) extending from the boundary surface CA to the outside of the trunk portion 10 is connected in addition to the internal space of the trunk portion 10 by the function of the virtual space providing unit 20. The sound can be pronounced reflecting the overall resonance characteristics. That is, in the guitar 1, a sound quality close to the resonance characteristic when the internal space of the trunk portion 10 becomes large is realized.
Next, the configuration of the signal processing unit 100 that performs signal processing that imparts an acoustic effect according to the shape of the virtual resonance space will be described in detail.

[Configuration of Signal Processing Unit 100]
FIG. 2 is a block diagram illustrating the configuration of the signal processing unit 100 according to the first embodiment of the present invention. The signal processing unit 100 includes amplification units 110 and 150, an AD conversion unit 120, a howling suppression unit 130, a DA conversion unit 140, and an acoustic effect applying unit 200. The amplifying unit 110 amplifies and outputs the electrical signal output from the microphone 30. The AD conversion unit 120 converts the electrical signal that is an analog signal output from the amplification unit 110 into a digital signal and outputs the digital signal.

  The howling suppression unit 130 performs a howling suppression process for suppressing an output level in the vicinity of a specific frequency in the sound wave output from the speaker 40. In this example, the howling suppression unit 130 is a notch filter, and performs an output process on the electrical signal output from the AD conversion unit 120 by attenuating a signal level in the vicinity of a specific frequency. The specific frequency corresponds to the peak frequency of the transfer function from the microphone 30 to the speaker 40, and in this example, is the highest peak frequency in the transfer function.

  The howling suppression unit 130 may have a configuration in which a plurality of notch filters are connected in series. In this case, a specific frequency whose level is attenuated in each notch filter may correspond to a plurality of peak frequencies (for example, frequencies of peaks selected in descending order) of the transfer function. In this example, the howling suppression unit 130 is provided between the AD conversion unit 120 and the acoustic effect applying unit 200, but is provided between the acoustic effect applying unit 200 and the DA conversion unit 140. May be. When howling is less affected by the content of the transfer function, the signal processing unit 100 may not include the howling suppression unit 130.

The acoustic effect imparting unit 200 performs signal processing for imparting an acoustic effect corresponding to the shape of the virtual resonance space to the electrical signal output from the howling suppression unit 130 and outputs the signal. A specific configuration of the acoustic effect applying unit 200 will be described later.
The DA converter 140 converts the electrical signal, which is a digital signal output from the acoustic effect applying unit 200, into an analog signal and outputs the analog signal. The amplification unit 150 amplifies the electrical signal output from the DA conversion unit 140 and outputs the amplified signal to the speaker 40.
Next, the shape of the virtual resonance space in this example will be described.

[Shape of virtual resonance space]
FIG. 3 is a diagram illustrating the shape of the virtual resonance space VS according to the first embodiment of the present invention. As shown in FIG. 3, the virtual resonance space VS has a rectangular parallelepiped shape. By connecting the one surface portion of the rectangular parallelepiped and the boundary surface CA of the body portion 10, the virtual resonance space VS extending from the boundary surface CA to the outside of the body portion 10 and the internal space BS of the body portion 10 are continuous resonance spaces. It becomes the structure which forms. That is, the space in which the vibration of the string 2 of the guitar 1 resonates is expanded to a space including not only the internal space BS of the trunk portion 10 but also a virtual resonance space VS that virtually extends outside the trunk portion 10. Show. Thus, the boundary surface CA in the trunk portion 10 exists at the position of the surface serving as the boundary between the internal space BS and the virtual resonance space VS.

The length of the virtual resonance space VS in the normal direction of the boundary surface CA is assumed to be h. The virtual resonance space VS has a columnar shape having a height h with the boundary surface CA as a bottom surface. In this example, the boundary surface CA is rectangular, and thus has a rectangular parallelepiped shape as described above. That is, if the boundary surface CA is circular, the virtual resonance space VS has a cylindrical shape with a height h.
Next, the configuration of the acoustic effect imparting unit 200 when the virtual resonance space VS has a column shape as described above will be described.

[Configuration of the acoustic effect applying unit 200]
FIG. 4 is a block diagram illustrating the configuration of the acoustic effect imparting unit 200 according to the first embodiment of the present invention. The acoustic effect applying unit 200 includes delay units 210 and 240, a filter unit 220, and an attenuation unit 230.
The delay unit 210 performs a predetermined delay process on the input electric signal and outputs it. This delay process assumes a sound wave (hereinafter referred to as an incident wave) that is a plane wave incident from the boundary surface CA, and a surface of the virtual resonance space VS (hereinafter referred to as a virtual reflection surface) where the incident wave faces the boundary surface CA. This process gives a delay corresponding to the time required to reach That is, when the sound speed is c, the delay time is represented by h / c. Therefore, if the sampling frequency when converted into a digital signal in the AD conversion unit 120 is Fs, the delay unit 210 delays the electric signal by Fs · h / c samples.

The filter unit 220 performs a filter process (for example, a process through a low-pass filter) for adjusting the phase and attenuating depending on the frequency on the electric signal output from the delay unit 210 and outputs the result. The sound wave reflected on the reflecting surface has a waveform that is dull (rounded and rounded) compared to the waveform before reflection. This filtering process is a process for reproducing such a phenomenon that the waveform is dull. About the grade which makes a waveform blunt, it is decided beforehand as a grade assumed in a virtual reflective surface. The phase adjustment is determined in advance depending on whether the virtual reflecting surface is a closed end or an open end.
The attenuating unit 230 attenuates the signal level of the electrical signal output from the filter unit 220 at a certain rate and outputs the attenuated signal. The rate of attenuation is determined in advance based on the reflectance assumed on the virtual reflecting surface.
When air is propagated, there are actually factors such as viscous resistance of air, heat loss resistance due to heat exchange with the wall of the trunk, and attenuation of sound waves. Therefore, either or both of the filter unit 220 and the attenuation unit 230 may perform signal processing on the electrical signal with the content including the influence of these attenuations.

The delay unit 240 performs a predetermined delay process on the electrical signal output from the attenuation unit 230 and outputs the result. This delay process is a process that gives a delay corresponding to the time required for a sound wave reflected on the virtual reflecting surface (hereinafter referred to as a reflected wave) to reach the boundary surface CA. That is, the delay amount is the same as that of the delay unit 210.
Although the delay unit 210 is provided on the input side of the electric signal in the acoustic effect applying unit 200 and the delay unit 240 is provided on the output side, the delay unit 210 may be provided on the input side or the output side. In this case, the delay unit 210 may be configured so as to be integrated into one delay unit, and a delay process with a delay amount twice the delay amount in the delay unit 210 may be performed on the electric signal.

As described above, in the acoustic effect imparting unit 200, processing for imparting the acoustic effect simulating the sound wave incident and reflected to the virtual resonance space VS to the sound wave incident on the boundary surface CA is performed. . The sound wave to which such an acoustic effect is applied is output from the boundary surface CA via the speaker 40.
Therefore, the guitar 1 does not resonate according to the volume of the internal space BS of the trunk portion 10 when resonating the vibration of the string 2 in the trunk portion 10, but from the boundary surface CA of the trunk portion 10. The virtual resonance space VS that spreads outside can be resonated according to the volume of the entire space connected to the internal space BS. Therefore, it is possible to reduce the size of a guitar that can produce sound with the sound quality when a large body is used.

Second Embodiment
Next, the guitar in the second embodiment will be described. In the second embodiment, compared to the configuration in the first embodiment, the location where the virtual space imparting unit 20 is provided, the shape of the virtual resonance space VS, and the configuration of the acoustic effect imparting unit 200 corresponding to this shape are different. It has become. Hereinafter, these differences will be described.

[Appearance composition]
FIG. 5 is a diagram for explaining the configuration of the body portion 10A in the second embodiment of the present invention. Unlike the trunk | drum 10 in 1st Embodiment, 10 A of trunk | drums in 2nd Embodiment are provided with the virtual space provision part 20A in the inside. 20 A of virtual space provision parts have the partition plate 21A which partitions off the space in the inside of trunk | drum 10A.

  Of the space inside the trunk portion 10A, the space on the side where the sound holes 12 and the bridges 13 are present than the partition plate 21A is the internal space BS, which is a space that resonates the vibration of the string 2. Thus, unlike the case of 1st Embodiment, the resonance part in 2nd Embodiment is comprised by the part which comprises internal space BS among the trunk | drum 10A, and the partition plate 21A.

The virtual space providing unit 20A includes a microphone 30A, a speaker 40A, and a signal processing unit 100A. The partition plate 21A corresponds to the boundary surface CA, and the microphone 30A and the speaker 40A are attached to the partition plate 21A.
Next, the shape of the virtual resonance space in this example will be described.

[Shape of virtual resonance space]
FIG. 6 is a diagram illustrating the shape of the virtual resonance space VS in the second embodiment of the present invention. As shown in FIG. 6A, the virtual resonance space VS is not the shape of the rectangular parallelepiped in the first embodiment, but the length in the width direction as the distance from the boundary surface CA increases (widths w1, w2, (Corresponding to the length represented by...). Further, the length (hereinafter referred to as thickness d) in the thickness direction (the distance in the depth direction in FIG. 6) of the boundary surface CA is assumed to be constant regardless of the distance from the boundary surface CA.

When it is not a columnar shape having the boundary surface CA as a bottom surface like the shape of the virtual resonance space VS shown in FIG. 6A, a plurality of columnar virtual resonance spaces VS1, as shown in FIG. A virtual resonance space VS is represented by approximating VS2,. In this example, the virtual resonance space VS has a columnar shape having a height hi with a horizontal length as the width Wi (i = 1, 2, 3, 4) and a vertical length as the bottom having a thickness d. It is approximated by a combination of (rectangular) virtual resonance space VSi.
Next, the configuration of the acoustic effect imparting unit 200A when the virtual resonance space VS is approximated to a plurality of column shapes as described above will be described.

[Configuration of acoustic effect applying unit 200A]
FIG. 7 is a block diagram illustrating the configuration of the acoustic effect imparting unit 200A according to the second embodiment of the present invention. As illustrated in FIG. 7A, the acoustic effect imparting unit 200A includes a VS1 processing unit 201 that performs processing according to the virtual resonance space VS1, a VS2 processing unit 202 that performs processing according to the virtual resonance space VS2, and a virtual resonance space. It has the VS3 process part 203 which performs the process according to VS3, and the VS4 process part 204 which performs the process according to virtual resonance space VS4.

  First, with respect to the VS1 processing unit 201, the VS2 processing unit 202, and the VS3 processing unit 203 corresponding to the virtual resonance spaces VS1, VS2, and VS3 that do not include the virtual reflection surface, the signal processing parameters for the electric signal are the shapes of the virtual resonance space. Therefore, the VS1 processing unit 201 will be described with reference to FIG. 7B as a representative example.

  The VS1 processing unit 201 includes delay units 2011 and 2013 and a junction filter unit 2012. The delay units 2011 and 2013 have a configuration corresponding to the delay units 210 and 240 in the first embodiment. Since the height of the virtual resonance space VS1 is h1, the delay times in the delay units 2011 and 2013 are h1 / c, respectively. The delay times corresponding to the virtual resonance spaces V2 and V3 are h2 / c and h3 / c, respectively. Note that the delay units 2011 and 2013 may be provided together on the input side or the output side as in the case of the delay units 210 and 240 in the first embodiment.

  The junction filter unit 2012 performs a filtering process on the input electrical signal to give a sound wave scattering effect at the joint between the virtual resonance spaces VS1 and VS2. A specific configuration of the junction filter unit 2012 will be described with reference to FIG.

FIG. 8 is a block diagram illustrating the configuration of the junction filter unit 2012 according to the second embodiment of the present invention. The junction filter unit 2012 is realized by, for example, a 4-multiplication lattice-filter illustrated in FIG. 8A or a 1-multiplication lattice-filter illustrated in FIG. The coefficients in the multipliers A1, A2, A3, and A4 in FIG. 8A are Ki, 1 + Ki, 1-Ki, and -Ki. Ki is determined by the following calculation formula.
Ki = (S (i) -S (i + 1)) / (S (i) + S (i + 1))
Here, S (i) = wi · d.
i is an index that designates one of the virtual resonance spaces VS1, VS2, and VS3. Therefore, since the junction filter unit 2012 in the VS1 processing unit 201 is a process related to the virtual resonance space VS1, the above formula is applied with i = 1.
Note that the coefficient of the multiplier A1 in FIG. 8B is Ki similarly to the multiplier A1 in FIG.

Returning to FIG. 7, the description will be continued. As shown in FIG. 7C, the VS4 processing unit 204 corresponding to the virtual resonance space VS4 including the virtual reflection surface includes delay units 2041 and 2044, a filter unit 2042, and an attenuation unit 2043. Each of these configurations is the same as that of the acoustic effect imparting unit 200 in the first embodiment, and parameters such as a delay time are determined corresponding to the shape of the virtual resonance space VS4 instead of the virtual resonance space VS.
As in the case of the filter unit 220 and the attenuating unit 230 in the first embodiment, either or both of the filter unit 2042 and the attenuating unit 2043 are used for the viscous resistance of air and the heat between the wall of the trunk unit. The signal processing may be performed on the electric signal with the content of the influence of attenuation of the sound wave due to the heat loss resistance due to the exchange.

  In this way, by combining and connecting the columnar virtual resonance spaces, the shape of the virtual resonance space VS is not limited to the column shape shown in the first embodiment, and can be various shapes. Further, as shown in the first embodiment, not only the entire body portion 10 is a resonance portion, but also a resonance portion can be configured by using a part of the body portion 10A and the partition plate 21A. In the first embodiment, the virtual space providing unit 20 protrudes from the body 10 of the guitar 1. However, in the guitar using the body 10A in the second embodiment, the virtual space providing unit 20A is installed inside the body 10A. Therefore, it is possible to produce sound with the tone quality of a guitar with a larger torso with the appearance almost the same as a general guitar.

<Modification>
As mentioned above, although embodiment of this invention was described, this invention can be implemented in various aspects as follows.
[Modification 1]
In the first and second embodiments described above, the vibration of the string 2 is resonated in a state where the virtual resonance space VS having a predetermined shape is connected to the internal space BS, but the shape of the virtual resonance space VS is changed. You may enable it to change by operation to the operation part 15 of a performer. In this case, the configuration of the acoustic effect imparting unit 200 may be the configuration of the acoustic effect imparting unit 200B illustrated in FIG.

FIG. 9 is a block diagram illustrating the configuration of the acoustic effect imparting unit 200B according to Modification 1 of the present invention. The acoustic effect imparting unit 200B includes a first acoustic effect imparting unit 200B-1, a second acoustic effect imparting unit 200B-2,..., And a selector 250B. The first acoustic effect imparting unit 200B-1, the second acoustic effect imparting unit 200B-2,... Are respectively added to the acoustic effect imparting unit 200 in the first embodiment or the acoustic effect imparting unit 200A in the second embodiment. It has a corresponding configuration. In these configurations, parameters corresponding to virtual resonance spaces VS having different shapes are determined.
The selector 250B selects the howling suppression unit 130 and the DA conversion unit 140 according to an operation signal from the operation unit 15, a first sound effect applying unit 200B-1, a second sound effect applying unit 200B-2,.・ Connect to one of the following.

  According to such a configuration, the performer can perform by switching to the sound quality of a guitar having a torso of various sizes. In the operation of the operation unit 15, not only the shape of the virtual resonance space VS but also a configuration that does not use the virtual resonance space VS may be selected. When the virtual resonance space VS is not used, the operation of each component in the virtual space providing unit 20 may be stopped. Further, as shown in the second embodiment, when the virtual space providing unit 20A exists inside the trunk portion 10A, the entire space in which the internal space BS and the virtual resonance space VS are connected is not stopped. However, the acoustic effect imparting part whose parameters are determined so as to have the same shape as the internal space of the entire body part 10A may be selected.

  Moreover, in the modification 1, although the acoustic effect provision part corresponding to every shape of the virtual resonance space VS was provided, according to the operation signal from the operation part 15, each set to one acoustic effect provision part You may reduce the number of sound effect provision parts by using the structure which changes a parameter. When the number is reduced to only one acoustic effect imparting unit, the selector 250B is not necessary.

[Modification 2]
In the first and second embodiments described above, the configuration using a guitar as an example of a musical instrument has been described, but other stringed instruments such as a violin may be used. The present invention may be other than a stringed instrument, for example, a percussion instrument, a wind instrument, etc., as long as the instrument has a resonator and a resonance part having an internal space in which the vibration of the vibrator resonates. May be applied. Hereinafter, conga (FIG. 10), marimba (FIG. 11), and trombone (FIG. 12) will be described as examples of musical instruments to which the configuration of the present invention is applied.

  FIG. 10 is a diagram illustrating the configuration of a conga 1C according to the second modification of the present invention. FIG. 10A shows a general conga 1CA, and FIG. 10B shows a conga 1C of the present invention. The conga 1C leaves the upper torso 10CU (corresponding to the torso 10C) of the upper UB to which the head 2C to be a vibrating body is attached from the torso 10CA of the conga 1CA, and removes the lower torso 10CD of the lower DB. It has a configuration.

  As shown in FIG. 10 (b), the body portion 10C is provided with a virtual space providing portion 20C in the same manner as the configuration in the second embodiment. 20 C of virtual space provision parts have the partition plate 21C which partitions the space in the inside of the trunk | drum 10C. Of the space inside the body portion 10C, the space on the side where the head 2C is provided with respect to the partition plate 21C is the internal space BS, which is a space that resonates the vibration of the head 2C. Thus, the resonance part in conga 1C is comprised by the part which comprises internal space BS among the trunk | drum 10C, the head 2C, and the partition plate 21C. The virtual space providing unit 20C includes a microphone 30C, a speaker 40C, and a signal processing unit 100C. The partition plate 21C corresponds to the boundary surface CA, and the microphone 30C and the speaker 40C are attached to the partition plate 21C. These configurations are the same as those in the second embodiment.

  The conga 1C configured in this manner produces a sound similar to the sound quality when the conga 1CA having the body 10CA is sounded by performing signal processing in the signal processing unit 100C according to the shape of the virtual resonance space VS. be able to. If the virtual resonance space VS has a larger shape, it is possible to produce a sound close to the sound quality that reproduces the resonance of a conga having a larger trunk.

  FIG. 11 is a diagram illustrating the configuration of the marimba 1D in the second modification of the present invention. FIG. 11 (a) shows a typical marimba 1DA, and FIG. 11 (b) shows a marimba 1D of the present invention. These drawings are schematic views of the marimba sound plate and the resonance pipe as viewed from the side. The marimba 1D leaves the upper resonance pipe 10DU (corresponding to the resonance pipe 10D) of the upper UB on the side where the sound plate 2D serving as a vibrating body is provided among the resonance pipes 10DA of the marimba 1DA, and the lower resonance pipe of the lower DB. 10DD is removed.

  As shown in FIG. 11B, a virtual space providing unit 20D is attached to the outside of the resonance pipe 10D in the resonance pipe 10D, similarly to the configuration in the first embodiment. The resonance pipe 10DA may not have a portion corresponding to the lower resonance pipe 10DD in the high sound range, but the resonance pipe 10DA is used as it is in the marimba 1D for the sound range. The application unit 20D is not attached.

  Since the lower end portion of the resonance pipe 10D is open, the virtual space imparting portion 20D has a partition plate 21D so as to close the lower end portion. A space inside the resonance pipe 10D is an internal space BS, which is a space for resonating vibrations of the sound plate 2D. Thus, the resonance part in the marimba 1D is constituted by the resonance pipe 10D and the partition plate 21D. The virtual space providing unit 20D includes a microphone 30D, a speaker 40D, and a signal processing unit 100D. Partition plate 21D corresponds to boundary surface CA, and microphone 30D and speaker 40D are attached thereto. These configurations are the same as those in the second embodiment.

  The marimba 1D configured as described above performs signal processing in the signal processing unit 100D in accordance with the shape of the virtual resonance space VS, thereby sounding close to the sound quality when the marimba 1DA having the resonance pipe 10DA is sounded. be able to. If the virtual resonance space VS has a larger shape, it can be sounded close to the sound quality that reproduces the resonance of a marimba having a longer resonance pipe.

  FIG. 12 is a diagram illustrating the configuration of the trombone 1E according to the second modification of the present invention. FIG. 12A shows a general trombone 1EA, and FIG. 12B shows a trombone 1E of the present invention. The trombone 1E leaves the mouthpiece 2E with which the lips serving as a vibrating body are in contact with the connecting portion 10J and the upstream tubular body 10EU (corresponding to the tubular body 10E) on the side where the slide tube is provided in the trombone 1EA. The downstream pipe body 10ED constituted by a bell pipe or the like is removed.

  As shown in FIG. 12 (b), a virtual space imparting portion attached to the resonance pipe 10D of the marimba 1D is provided at the end of the tubular body 10E opposite to the mouthpiece 2E (corresponding to the connecting portion 10J). A virtual space giving unit 20E configured similarly to 20D is attached. The virtual space giving unit 20E has the same configuration as that of the virtual space giving unit 20D, and is changed in size according to the diameter of the tubular body 10E. Therefore, in FIG. The description of the processing unit was omitted.

  The trombone 1E configured as described above performs sound processing when the trombone 1EA having the downstream tubular body 10ED is caused to sound by performing signal processing in the virtual space providing unit 20E according to the shape of the virtual resonance space VS. It can also be pronounced close to the pitch. If the virtual resonance space VS has a larger shape, the trombone 1E can be sounded close to the sound quality and pitch reproducing the resonance of the tenor trombone and bass trombone having a lower sound range.

In addition, for the conga 1C, marimba 1D, and trombone 1E in the above example, the virtual reflection surface in the virtual resonance space VS is an open end, so that the filter units 220 and 2042 and the attenuation unit 230 in the first and second embodiments, Each parameter used in 2043 may be significantly different from the case of the present modification and the case of the first and second embodiments.
Further, the above conga 1C, marimba 1D, and trombone 1E may be configured so that sound quality can be switched and sounded as in the first modification by providing the operation unit 15.

[Modification 3]
In the first and second embodiments described above, the howling suppression unit 130 suppresses howling using a notch filter. However, howling may be suppressed by another configuration. For example, a process for shifting the phase in the vicinity of the peak frequency is applied to the electrical signal output from the AD converter 120 so that the oscillation condition is not satisfied at the peak frequency of the transfer function from the microphone 30 to the speaker 40. Just output. In order to perform signal processing for shifting the phase in this way, a phase shift filter such as an all-pass filter may be used.

DESCRIPTION OF SYMBOLS 1 ... Guitar, 1C, 1CA ... Conga, 1D, 1DA ... Marimba, 1E, 1EA ... Trombone, 2 ... String, 2C ... Head, 2D ... Sound board, 2E ... Mouthpiece 10, 10A, 10C, 10CA ... Body 10D, 10DA ... resonance pipe, 10CU ... upper barrel, 10CD ... lower barrel, 10DU ... upper resonance pipe, 10DD ... lower resonance pipe, 10E ... pipe, 10EU ... upstream pipe, 10ED ... downstream pipe, 10J: Connection unit, 12: Sound hole, 13 ... Bridge, 14 ... Saddle, 15 ... Operation unit, 20, 20A, 20C, 20D, 20E ... Virtual space adding unit, 21A. 21C, 21D ... partition plate, 30, 30A, 30C, 30D, 30E ... microphone, 40, 40A, 40C, 40D, 40E ... speaker, 100, 100A, 100C, 100D, 100E ... signal processing unit, 110, 150 ... amplification , 120 ... AD conversion unit, 130 ... howling suppression unit, 140 ... DA conversion unit, 200, 200A ... acoustic effect imparting unit, 200B-1 ... first acoustic effect imparting unit, 200B-2 ... second acoustic effect imparting unit 201 ... VS1 processing unit, 202 ... VS2 processing unit, 203 ... VS3 processing unit, 204 ... VS4 processing unit, 210, 240, 2011, 2013, 2041, 2044 ... delay unit, 220, 2042 ... filter unit, 230, 2043 ... Attenuator, 2012 ... Junction filter, 250B ... Selector

Claims (5)

  1. A resonance part that transmits vibrations of the vibrating body and resonates in the internal space;
    A microphone that converts a sound wave that reaches a boundary surface of a predetermined range of the resonance portion into an electric signal and outputs the electric signal;
    Signal processing that provides an acoustic effect corresponding to the shape of a virtual resonance space that virtually extends from the boundary surface to the outside of the resonance portion and that corresponds to a sound wave that is incident and reflected on the virtual resonance space. , A signal processing unit applied to the output electrical signal;
    A musical instrument, comprising: a speaker that converts the electric signal subjected to the signal processing into a sound wave and outputs the sound signal from the boundary surface toward the internal space.
  2. The musical instrument according to claim 1, further comprising a howling suppression unit that performs a howling suppression process in accordance with a transfer function from the microphone to the speaker with respect to the electrical signal to which the signal processing is performed.
  3. The musical instrument according to claim 2, wherein the howling suppression processing is signal processing for suppressing an output level at a peak frequency of the transfer function among sound waves output from the speaker.
  4. The musical instrument according to claim 2, wherein the howling suppression process is a signal process for shifting a phase of a sound wave output from the speaker so that an oscillation condition is not satisfied at a peak frequency of the transfer function.
  5. An operation means for receiving an operation for designating the shape of the virtual resonance space;
    5. The signal processing unit according to claim 1, wherein the signal processing unit performs signal processing corresponding to a shape of a virtual resonance space designated by the accepted operation on the output electric signal. The instrument described in crab.
JP2010250635A 2010-11-09 2010-11-09 Musical instrument Expired - Fee Related JP5707876B2 (en)

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JPH0711757B2 (en) * 1988-07-20 1995-02-08 ヤマハ株式会社 Portable musical instruments
JP3336729B2 (en) * 1994-02-28 2002-10-21 ヤマハ株式会社 Sound field control device
JP3526505B2 (en) * 1996-09-24 2004-05-17 株式会社コルグ Electronic musical instrument
JP4479688B2 (en) * 2006-03-30 2010-06-09 ヤマハ株式会社 Performance assist mouthpiece and wind instrument with performance assist device
JP4697267B2 (en) * 2008-07-01 2011-06-08 ソニー株式会社 Howling detection apparatus and howling detection method
JP5287328B2 (en) * 2009-02-17 2013-09-11 ヤマハ株式会社 Percussion instrument

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