JP5441509B2 - Electronic musical instruments - Google Patents

Description

  The present invention relates to an electronic musical instrument, and more particularly to an electronic musical instrument that can give a natural stereo-type musical sound (a musical sound with a natural spread) to the listener regardless of the position of the listener.

  As an electronic musical instrument that outputs a stereo-type musical sound in response to a key depression, for example, an electronic musical instrument shown in FIG. 12 of JP-A-2006-003429 is known. This electronic musical instrument is provided with four speakers 56L, 56R, 57L, and 57R. The speakers 56L and 57L output the left channel of the musical sound corresponding to the key depression upward and output the speaker 56R. From 57R, the right channel of the musical sound corresponding to the key depression is output upward. As a result, the musical sound output from the electronic musical instrument is broadened.

JP 2006-003429 A

  Here, in the electronic musical instrument described above, the propagation direction of the left channel of the musical sound, that is, the propagation direction of the component mainly including the low frequency sound of the musical sound is a direction (for example, the speaker 56L) connecting the speaker 56L and the speaker 57L with a straight line. The direction in which the center of the sound and the center of the speaker 57L are connected by a straight line) is dominant, and the propagation direction of the right channel of the musical sound, that is, the propagation direction of the component mainly composed of the high frequency sound of the musical sound is the speaker 56R and the speaker 57R. The direction of connecting the two with a straight line becomes dominant. As a result, in this electronic musical instrument, the position where the propagation direction of the component mainly composed of the low frequency sound and the propagation direction of the component mainly composed of the high frequency sound of the musical sound intersect (the low frequency sound of the musical sound). The position where most of the main component and the main component of the high frequency sound of the musical tone are synthesized) is a position away from the electronic musical instrument. As a result, until the position where the propagation directions intersect, the composition of the component mainly composed of the low frequency sound and the component mainly composed of the high frequency sound is reduced. Therefore, when there is a listener between the position where the propagation direction intersects and the electronic musical instrument, a musical sound in which either one of the low frequency sound or the high frequency sound is dominant is given to the listener, As a result, there has been a problem that an unnatural stereo-type musical tone (a musical tone having a small spread) is given. In addition, when a listener is present on the left side of the electronic musical instrument described above (the side where the speaker 56L and the speaker 57L are disposed), a musical sound in which a low frequency component is dominant is given to the listener. When a listener is present on the right side of the electronic musical instrument described above (the side where the speaker 56R and the speaker 57R are disposed), a musical sound in which a high frequency component is dominant is given to the listener. Therefore, in this case as well, there is a problem that an unnatural stereo-type musical sound (a musical sound with a small spread) is given.

  The present invention has been made in order to solve the above-described problems, and an electronic device capable of giving a natural stereo sound (a sound having a natural spread) to the listener regardless of the position of the listener. The purpose is to provide musical instruments.

  In order to achieve this object, an electronic musical instrument according to claim 1 is provided with a keyboard having a plurality of keys provided corresponding to stereo-type musical sounds to be output, and the keyboard is attached and opened upward. A housing provided with an opening, and a left channel that is disposed on the bass side of the keyboard within the housing and outputs the left channel of the musical sound corresponding to the key depression of the key toward the opening of the housing Arranged first speaker and a right that is arranged on the high pitch side of the keyboard with respect to the left arranged first speaker and outputs the right channel of the musical sound corresponding to the key depression of the key toward the open part of the casing An arrangement first speaker and an arrangement on the back side of the keyboard with respect to the keyboard relative to the left and right arrangement first speakers in the housing, and arranged on a bass side of the keyboard, corresponding to key depression of the key The right channel of the musical sound A left-arranged second speaker that outputs the sound toward the open portion of the casing, and the left-arranged position within the casing with respect to the keyboard behind the left and right-arranged first speakers. A second speaker that is arranged on the high-pitched side of the keyboard with respect to the second speaker and that outputs the left channel of the musical sound corresponding to the key depression toward the open portion of the housing; .

  According to a second aspect of the present invention, in the electronic musical instrument according to the first aspect, the left and right-arranged second speakers are arranged at positions that are shorter than a distance between the left and right-arranged first speakers. At the same time as the left and right arrangement first speakers.

  The electronic musical instrument according to claim 3 is the electronic musical instrument according to claim 2, wherein the casing is shaped like an acoustic grand piano that stretches a string from the keyboard side toward the back side in the casing. The left-arranged second speaker is disposed at a position corresponding to an arrangement position of a long piece provided in the case when the case is assumed to be used as the acoustic grand piano. When it is assumed that the housing is used as the acoustic grand piano, the second speaker is disposed at a position corresponding to an arrangement position of a short piece provided in the housing.

  According to the electronic musical instrument of the first aspect, the first left speaker arranged on the low sound side of the keyboard outputs the left channel of the musical sound toward the opening of the casing and is arranged on the high sound side of the keyboard. The right-arranged first speaker outputs the right sound channel toward the opening of the housing. On the contrary, the second left speaker arranged on the back side of the left and right arranged first speakers and arranged on the bass side of the keyboard outputs the right sound channel toward the opening of the housing. Then, the second right speaker arranged on the back side of the left and right first speakers and arranged on the high pitch side of the keyboard outputs the left channel of the musical sound to the opening of the casing. Therefore, the propagation direction of the left channel of the musical sound, that is, the propagation direction of the component mainly composed of the low frequency sound of the musical tone, is predominantly the direction connecting the left first speaker and the second right speaker with a straight line. Similarly, the propagation direction of the right channel of the musical sound, that is, the propagation direction of the component mainly consisting of the high frequency sound of the musical tone, is predominantly the direction connecting the left first speaker and the second right speaker with a straight line. . Thereby, the propagation direction of the component mainly composed of the low-frequency sound of the musical sound and the propagation direction of the component mainly composed of the high-frequency sound of the musical sound can be crossed within the casing. That is, a component mainly composed of low-frequency sounds and a component mainly composed of high-frequency sounds can be synthesized in the casing. As a result, it is possible to reduce the fact that either one of the low frequency sound and the high frequency sound becomes dominant depending on the position of the listener outside the housing. Therefore, regardless of the position of the listener, there is an effect that a natural stereo-type musical sound (music having a natural spread) can be given to the listener. The direction connecting the first speaker and the second speaker with a straight line is, for example, the direction connecting the center of the first speaker and the center of the second speaker with a straight line, or the outer periphery of the first speaker and the second speaker. The direction of the tangent line in contact with is exemplified.

  According to the electronic musical instrument of the second aspect, in addition to the effect produced by the electronic musical instrument of the first aspect, the left and right arranged second speakers have a separation distance shorter than the separation distance of the left and right arranged first speakers. It is a position, and it is arranged within the separation range of the left speaker and the right arrangement first speaker. Therefore, it is possible to form a localized sound between the left-arranged first speaker and the right-arranged first speaker by the musical sounds output from the left and right-arranged second speakers. Therefore, in particular, even when the listener is located near the keyboard or near the back side, the listener feels uncomfortable that there is not enough musical sound to be localized between the first left speaker and the first right speaker. Can be reduced. As a result, there is an effect that a natural stereo-type musical sound (musical sound having a natural spread) can be given to the listener.

  According to the electronic musical instrument according to claim 3, in addition to the effect produced by the electronic musical instrument according to claim 2, when it is assumed that the casing is used as an acoustic grand piano, the arrangement of long frames provided in the casing is provided. The left second speaker is arranged at a position corresponding to the position (at a position corresponding to the assumed position of the long piece), and at a position corresponding to the position of the short piece provided in the housing (assumed. The right second speaker is disposed at a position corresponding to the position of the short piece. Therefore, the right channel of the musical sound output from the second speaker arranged at the left can imitate the musical tone output through the long piece of the acoustic grand piano by the right channel of the musical tone output from the second speaker arranged at the left. Therefore, it is possible to imitate the musical sound output through the short piece of the acoustic grand piano. Therefore, according to the electronic musical instrument of the third aspect, it is possible to faithfully imitate the musical sound output from the acoustic grand piano, and as a result, it is possible to give the musical sound to the listener as if output from the acoustic grand piano. effective.

It is a perspective view of the electronic piano which is one Embodiment of this invention. It is the block diagram which showed the electrical structure of the electronic piano. (A) is the top view of the electronic piano which showed the arrangement position of each speaker, (b) is the figure which showed typically propagation of the musical sound output from each speaker. It is a top view of the electronic piano of 2nd Embodiment in the arrow Z direction view.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view showing a state in which a large roof 8 is opened in an electronic piano 1 according to an embodiment of the present invention. In the following description, when the electronic piano 1 is viewed from the performer, the front side (the lower side of the drawing in FIG. 3A) is “front” and the inner side (the upper side of the drawing in FIG. 3A). “Back”, the low tone side (left side of FIG. 3A) of many keys 3 is “left”, and the high tone side of key 3 (right side of FIG. 3A) is “right”. explain.

  As shown in FIG. 1, the electronic piano 1 is an electronic piano that imitates an acoustic grand piano (piano with strings stretched horizontally), and a side plate 13 is attached to the periphery of a bottom plate (not shown) that extends in the horizontal direction. The piano body 2 formed by surrounding the piano body 2, the keyboard 4 fixed to the piano body 2, the large roof 8 connected to the piano body 2 so as to be rotatable, and the large roof 8 in an open state. A support bar 11 that supports the piano body 2, three legs 6 that support the piano body 2 (only a pair of left and right legs are shown, and the rear legs are not shown), and extends downward from the piano body 2. And a pedal 7.

  The piano body 2 is a housing that incorporates an electronic circuit on which a CPU 22 and the like to be described later are mounted, and speakers 9L (L), 9R (R), 10L (R), 10R (L), and the like. A keyboard 4 provided with a plurality of keys 3 is fixed to the front surface of the piano body 2. A flat sound board 5 is provided on the upper surface of the piano body 2, and the sound board 5 is provided with four openings opened upward. In each opening, four speakers 9L (L), 9R (R), 10L (R), and 10R (L) are fitted with the diaphragm facing upward. The alphabet “L, R” described in each speaker indicates the position of the speaker, and the alphabet “(L), (R)” in parentheses described in each speaker indicates a stereo-type musical sound to be output. Shows the channel. For example, the speaker 9L (L) is arranged on the left side of the soundboard 5 and outputs an L channel (left channel) of musical sound. Details of the arrangement of the speakers 9L (L), 9R (R), 10L (R), and 10R (L) will be described later with reference to FIG.

  Next, the electrical configuration of the electronic piano 1 will be described with reference to FIG. FIG. 2 is a block diagram showing an electrical configuration of the electronic piano 1.

  The electronic piano 1 includes a CPU 22, a ROM 23, a RAM 24, a flash memory 25, a keyboard 4, an operation panel 26, a pedal 7, and a sound source 27, which are connected to each other via a bus line 30. Has been. The electronic piano 1 further includes a D / A converter 28, amplifiers 29L and 29R, and speakers 9L (L), 9R (R), 10L (R), and 10R (L). The sound source 27 is connected to the input of the D / A converter 28, and the output of the D / A converter 28 is connected to the inputs of the amplifiers 29L and 29R. The output of the amplifier 29L is connected to the speakers 9L (L) and 10R (L), and the output of the amplifier 29R is connected to the speakers 9R (R) and 10L (R).

  The CPU 22 is an arithmetic processing unit, and the ROM 23 is a memory that stores various control programs executed by the CPU 22 and fixed value data referred to during the execution. The RAM 24 is a rewritable memory for temporarily storing various data and the like when executing the control program stored in the ROM 23. The flash memory 25 is a non-volatile memory that continuously stores contents even when the power of the electronic piano 1 is turned off.

  The keyboard 4 has a plurality of white keys 3 and black keys 3 (see FIG. 1). When a key is pressed by the performer, the CPU 22 calculates a speed corresponding to the key pressed for each key. When the key release is performed by the performer, the CPU 22 calculates a speed corresponding to the key release for each key. Here, in the electronic piano 1 of the present embodiment, when a key is pressed or released by the performer, a process similar to a known process is performed.

  The operation panel 26 has various volumes, switches, and the like, and is configured so that various modes, musical sound parameters, and the like can be set by the performer. The pedal 7 is a device that is disposed below the keyboard 4 and at the performer's feet, and is operated when the performer steps on the foot.

  The sound source 27 incorporates a DSP 27a, and generates a stereo digital music signal having a pitch and tone corresponding to the musical tone information output from the CPU 22 when the keyboard 4 is depressed. When the key release of 4 is performed, the generation of the digital musical tone signal is stopped. Here, the stereo-type digital musical tone signal indicates a digital musical tone signal having an L channel (left channel) and an R channel (right channel). When a stereo digital music signal is output from the sound source 27, the D / A converter 28 converts the stereo digital music signal into a stereo analog music signal.

  The L channel analog musical sound signal output from the D / A converter 28 is input to the amplifier 29L and amplified. The amplified musical sound signal is converted into musical sound and output from the speakers 9L (L) and 10R (L). Thereby, the musical sound output from the speakers 9L (L) and 10R (L) is a component mainly composed of the L channel of the musical sound corresponding to the key depression, that is, the low frequency sound of the musical sound.

  On the other hand, the R channel analog musical tone signal output from the D / A converter 28 is input to the amplifier 29R and amplified. The amplified musical sound signal is converted into musical sound and output from the speakers 9R (R) and 10L (R). Thus, the musical sound output from the speakers 9R (R) and 10L (R) is a component mainly composed of the R channel of the musical sound corresponding to the key depression, that is, the high frequency sound of the musical sound.

  Next, with reference to FIG. 3, details of the arrangement positions of the speakers 9L (L), 9R (R), 10L (R), and 10R (L) will be described. FIGS. 3A and 3B are top views of the electronic piano 1 as viewed in the direction of arrow Z (see FIG. 1). In FIG. 3, members other than the piano body 2, the keyboard 4, the soundboard 5, and the speakers 9L (L), 9R (R), 10L (R), and 10R (L) are not shown. Yes.

  Here, FIG. 3A shows the arrangement position of each speaker 9L (L), 9R (R), 10L (R), 10R (L), and FIG. 3B shows each speaker 9L ( L), 9R (R), 10L (R), and 10R (L) schematically show the propagation of the musical sound output.

  As shown in FIG. 3A, the speaker 9L (L) and the speaker 9R (R) are arranged in the piano body 2. Specifically, the speaker 9L (L) is disposed on the keyboard 4 side (front side) of the soundboard 5, and is disposed on the bass side (left side) of the keyboard 4, and the speaker 9R (R) is disposed on the soundboard 5. Are arranged on the keyboard 4 side (front side) and on the high pitch side (right side) of the keyboard 4.

  A speaker 10L (R) and a speaker 10R (L) are also disposed in the piano main body 2. Specifically, the speaker 10 </ b> L (R) is disposed on the back side (back side) with respect to the keyboard 4 with respect to the keyboard 9 than the speakers 9 </ b> L (L) and 9 </ b> R (R) in the soundboard 5. It is arranged on the side (left side). In addition, the speaker 10R (L) is disposed on the rear side (back side) with respect to the keyboard 4 with respect to the keyboard 9 with respect to the speaker 9L (L) and the speaker 9R (R) in the soundboard 5, and on the high-pitched side (right side) of the keyboard 4 ).

  Here, with reference to FIG. 3B, the propagation of musical sounds output from the speakers 9L (L), 9R (R), 10L (R), and 10R (L) will be described. The speaker 9L (L) outputs the L channel of the musical sound corresponding to the key depression, and the speaker 9R (R) outputs the R channel of the musical tone corresponding to the key depression. On the contrary, the speaker 10L (R) outputs the R channel of the musical sound corresponding to the key depression, and the speaker 10R (L) outputs the L channel of the musical tone corresponding to the key depression. Therefore, the propagation direction of the L channel of the musical sound, that is, the propagation direction of the component mainly including the low frequency sound of the musical tone is the arrow Ya direction that is a direction connecting the speaker 9L (L) and the speaker 10R (L) with a straight line. Become dominant. Similarly, the propagation direction of the R channel of the musical tone, that is, the propagation direction of the component mainly composed of the high frequency tone of the musical tone, is the direction of the arrow Yb that is a direction connecting the speaker 9R (R) and the speaker 10L (R) with a straight line. Becomes dominant. Thereby, the propagation direction of the component mainly composed of the low frequency sound of the musical sound and the propagation direction of the component mainly composed of the high frequency sound of the musical sound can be crossed within the piano main body 2. That is, a component mainly composed of low-frequency sounds and a component mainly composed of high-frequency sounds can be synthesized in the piano body 2 and the propagation range of the mid-range sound is expanded to the M region. Can do. Therefore, it is possible to reduce the fact that either the low-frequency sound or the high-frequency sound becomes dominant depending on the position of the listener outside the piano body 2. Therefore, regardless of the position of the listener (even if there is a listener on the front side, rear side, right side or left side outside the piano body 2), a natural stereo-type musical sound (musical sound having a natural spread) is given to the listener. be able to.

  As shown in FIG. 3A, in the electronic piano 1, the distance a between the center PL2 of the speaker 10L (R) and the center PR2 of the speaker 10R (L) is equal to the center PL1 of the speaker 9L (L). The distance is shorter than the distance d from the center PR1 of the speaker 9R (R). Furthermore, the speaker 10L (R) and the speaker 10R (L) are disposed within a distance of the speaker 9L (L) and the speaker 9R (R).

  Here, “within the separation distance” indicates the next region in the soundboard 5. That is, the tangent line S1 that is in contact with the outer periphery on the left side of the speaker 9L (L) and perpendicular to the left and right direction of the keyboard 4 and the tangent line S2 that is in contact with the outer periphery on the right side of the speaker 9R (R) and perpendicular to the left and right direction of the keyboard 4 And a region in the soundboard 5 surrounded by a tangent line S3 in contact with the outer periphery of the rear side (back side) of the speaker 9L (L) and the speaker 9R (R) (shaded portion in FIG. 3A).

  When the rear side (back side) direction is viewed from the keyboard 4 depending on the positions of the speakers 10L (R) and 10R (L), the speakers 10L (R) and 10R (L) are connected to the speaker 9L ( L) and the speaker 9R (R). Therefore, it is possible to form a localized sound between the speaker 9L (L) and the speaker 9R (R) by the sound output from the speaker 10L (R) and the speaker 10R (L). Therefore, in particular, even when the listener is located near the keyboard 4 or near the rear side (back side) of the piano body 2, the listener is positioned between the speakers 9L (L) and 9R (R). It is possible to reduce an uncomfortable feeling that the musical sound to be played is insufficient. As a result, it is possible to give the listener a natural stereo-type musical sound (musical sound having a natural spread).

  3A, in the electronic piano 1, straight lines passing from the left end of the piano body 2 to the right end of the piano body 2 through the center PL2 of the speaker 10L (R) and the center PR2 of the speaker 10R (L). Is obtained by adding the distance b from the center PL2 of the speaker 10L (R) to the left end of the piano body 2 and the distance c from the center PR2 of the speaker 10R (L) to the right end of the piano body 2. Also, the separation distance a is a short distance. As described above, the components mainly composed of low-frequency sounds and the components mainly composed of high-frequency sounds are synthesized in the piano body 2 by bringing the speakers 10L (R) and 10R (L) as close as possible. be able to.

  Further, as shown in FIG. 3A, in the electronic piano 1, when the piano body 2 is used as an acoustic grand piano (a piano with strings stretched horizontally from the keyboard 4 side toward the rear side (back side)). When assumed, the speaker 10L (R) is arranged at a position corresponding to the arrangement position of the long frames provided in the piano body 2 (on the assumed arrangement position of the long frames). Further, when it is assumed that the piano body 2 is used as an acoustic grand piano, the speaker 10R is placed at a position corresponding to the position of the short frame provided in the piano body 2 (on the assumed position of the short frame). (L) is arranged.

  Therefore, it is possible to imitate the musical sound output through the long piece of the acoustic grand piano by the R channel of the musical sound output from the speaker 10L (R), and the L channel of the musical sound output from the speaker 10R (L). Therefore, it is possible to imitate the musical sound output through the short piece of the acoustic grand piano. Therefore, according to the electronic piano 1, the musical sound output from the acoustic grand piano can be imitated faithfully, and as a result, the musical sound as if output from the acoustic grand piano can be given to the listener.

  As described above, according to the electronic piano 1 of the present embodiment, the L channel of the musical sound is output from the speaker 9L (L) and the speaker 10R (L), and the musical sound R is output from the speaker 9R (R) and the speaker 10L (R). Output the channel. As a result, a component mainly composed of low-frequency sounds and a component mainly composed of high-frequency sounds can be synthesized in the piano body 2 and the propagation region of the mid-range sound is expanded to the M region. be able to. Therefore, it is possible to reduce the fact that either the low-frequency sound or the high-frequency sound becomes dominant depending on the position of the listener outside the piano body 2. Therefore, regardless of the position of the listener, a natural stereo musical tone (a musical tone having a natural spread) can be given to the listener.

  Next, with reference to FIG. 4, the electronic piano 1 of 2nd Embodiment, ie, the electronic piano 1 which changed the arrangement position of the speaker 10L (R) and the speaker 10R (L), is demonstrated. FIG. 4 is a top view of the electronic piano 1 according to the second embodiment when viewed in the direction of arrow Z (see FIG. 1), and shows the speakers 9L (L), 9R (R), 10L (R), and 10R (L). The arrangement position is shown. 4, as in FIG. 3, members other than the piano body 2, keyboard 4, soundboard 5 and speakers 9 </ b> L (L), 9 </ b> R (R), 10 </ b> L (R), 10 </ b> R (L) The illustration is omitted.

  As shown in FIG. 4, the speaker 10 </ b> L (R) and the speaker 10 </ b> R (L) are disposed within a separation distance between the speaker 9 </ b> L (L) and the speaker 9 </ b> R (R), as in the first embodiment shown in FIG. 3. Yes. The distance a between the center PL2 of the speaker 10L (R) and the center PR2 of the speaker 10R (L) is shorter than the sum of the distance b and the distance c. The speaker 10L (R) is arranged at a position (on the arrangement position of the long piece) corresponding to the assumed position of the long frame, and the speaker 10R (L) is a position corresponding to the assumed position of the short piece ( It is placed on the short piece placement position).

  Then, as shown in FIG. 4, the speaker 10 </ b> L (R) is arranged so that the outer periphery of the keyboard 4 of the speaker 10 </ b> L (R) is in contact with the tangent line S <b> 1. In accordance with this, the speaker 10R (L) is arranged on the position where the separation distance a is maintained and on the arrangement position of the short frame. Thus, as shown in the electronic piano 1 of the first embodiment (see FIG. 3), the arrangement position of the speaker 10L (R) is limited to a position spaced from the tangent line S1 to the high pitch side (right side) of the keyboard 4. It is not a thing. Even if the speaker 10L (R) is arranged at the position shown in FIG. 4, the propagation direction of the component mainly composed of the low frequency sound of the musical tone and the propagation direction of the component mainly composed of the high frequency sound of the musical sound are determined. Can be crossed in the piano body 2. Therefore, regardless of the position of the listener (even if there is a listener on the front side, rear side, right side or left side outside the piano body 2), a natural stereo-type musical sound (musical sound having a natural spread) is given to the listener. be able to. In addition, it is possible to form a localized sound between the speaker 9L (L) and the speaker 9R (R) by the sound output from the speaker 10L (R) and the speaker 10R (L). Therefore, it is possible to reduce the uncomfortable feeling that the localized sound is insufficient between the speakers 9L (L) and 9R (R). Furthermore, the musical sound output from the acoustic grand piano can be imitated faithfully.

  As described above, the present invention has been described based on the present embodiment, but the present invention is not limited to the above-described embodiment, and various modifications can be easily made without departing from the spirit of the present invention. It can be guessed.

  In the first embodiment and the second embodiment described above, it is possible to reduce an uncomfortable feeling that the localized sound is insufficient between the speaker 9L (L) and the speaker 9R (R), and to perform acoustic. In order to faithfully imitate the musical sound output from the grand piano, the speaker 10L is located at a position within the distance between the speakers 9L (L) and 9R (R) and corresponding to the assumed long frame arrangement position. (R) is disposed, and the speaker 10R (L) is disposed at a position that is within the distance between the speaker 9L (L) and the speaker 9R (R) and that corresponds to the assumed position of the short frame. However, the present invention is not limited to this, and if it is not necessary to imitate the musical sound output from the acoustic grand piano, the speaker 10L (R) and the speaker 10R (L) are placed at the assumed positions of long and short frames. Regardless, the speaker 9L (L) and the speaker 9R (R) may be disposed within a separation distance. Even in this configuration, it is possible to form a localized sound between the speaker 9L (L) and the speaker 9R (R). Therefore, in particular, even when the listener is located near the keyboard 4 or near the rear side (back side) of the piano body 2, the listener is positioned between the speakers 9L (L) and 9R (R). It is possible to reduce an uncomfortable feeling that the musical sound to be played is insufficient.

  In the first and second embodiments described above, the distance a between the center PL2 of the speaker 10L (R) and the center PR2 of the speaker 10R (L) is added to the distance b and the distance c. Even if the distance is shorter (by making the speaker 10L (R) and the speaker 10R (L) as close as possible), a component mainly composed of low-frequency sounds and a component mainly composed of high-frequency sounds Although synthesized in the piano body 2, it is not limited to this. In other words, the synthesis of the component mainly composed of low-frequency sounds and the component mainly composed of high-frequency sounds is most effective when the arrows Ya and Yb (see FIG. 3B) are intersected in the piano body 2. Yes, the synthesis by bringing the speaker 10L (R) and the speaker 10R (L) as close as possible is auxiliary. Therefore, when the arrows Ya and Yb are intersected in the piano main body 2 and the component mainly composed of low-frequency sounds and the component mainly composed of high-frequency sounds are sufficiently synthesized, the speaker 10L (R ) And the center PR2 of the speaker 10R (L) need not be shorter than the distance obtained by adding the distance b and the distance c. In this case, the speaker 10L (R) and the speaker 10R (L) are arranged within a distance of the speaker 9L (L) and the speaker 9R (R), and then the center PL2 of the speaker 10L (R) and the speaker 10R are arranged. The distance a from the center PR2 in (L) may be the same as the distance obtained by adding the distance b and the distance c, or may be longer than the distance obtained by adding the distance b and the distance c.

  In the first embodiment and the second embodiment described above, an electronic device simulating an acoustic grand piano is used as a target for arranging the speakers 9L (L), 9R (R), 10L (R), and 10R (L). Although it is set as the piano 1, it is not restricted to this. That is, it is good also considering the object which arrange | positions each speaker 9L (L), 9R (R), 10L (R), 10R (L) as an electronic organ or a synthesizer. Note that, for example, when an electronic organ is used as a target for arranging the speakers 9L (L), 9R (R), 10L (R), and 10R (L), the electronic organ is compared with the electronic piano 1. If it is not necessary to form a localized sound between the speaker 9L (L) and the speaker 9R (R) because the width in the front-rear direction (backward direction) is narrow, the speaker 10L (R) and the speaker The arrangement position of 10R (L) is not necessarily limited to the distance between the speaker 9L (L) and the speaker 9R (R). Therefore, at this time, either or both of the speaker 10L (R) and the speaker 10R (L) may be arranged outside the distance between the speaker 9L (L) and the speaker 9R (R) (for example, The distance a between the speakers 10L (R) and 10R (L) may be longer than the distance d between the speakers 9L (L) and 9R (R). Even in this case, the propagation direction of the component mainly composed of the low frequency sound of the musical sound and the propagation direction of the component mainly composed of the high frequency sound of the musical sound can be crossed within the electronic organ. That is, a component mainly composed of low-frequency sounds and a component mainly composed of high-frequency sounds can be synthesized in the electronic organ, and the propagation range of the mid-range sound can be widened. Therefore, regardless of the position of the listener, a natural stereo musical tone (a musical tone having a natural spread) can be given to the listener.

  In the first and second embodiments described above, the speakers 9L (L), 9R (R), 10L (R), and 10R (L) are placed in the openings provided in the soundboard 5. The diaphragm of each speaker is directed upward by fitting, but the direction of the diaphragm of each speaker is not limited to this. That is, the diaphragm of each speaker may be directed toward the rear side (back side) of the piano body 2 or toward the front side (keyboard 4 side) of the piano body 2. Further, the diaphragm of each speaker is directed obliquely, specifically toward the rear side (back side) direction and the upper side of the piano body 2, or the front side of the piano body 2 (keyboard 4 side). ) May be directed between the direction and the upper side. Further, the direction of the diaphragm of each speaker may be varied among the speakers. When the diaphragm of each speaker is directed to other than the upper side, for example, an opening having a smaller diameter than the diaphragm of each speaker is formed in the soundboard 5 in accordance with the direction in which the diaphragm of each speaker faces. Provide multiple. Then, a configuration in which each speaker outputs a musical sound toward the plurality of openings (a configuration in which the diaphragm of each speaker is directed to the plurality of openings) may be used.

2 Piano body (housing)
4 Keyboard 9L (L) Speaker (left first speaker)
9R (R) speaker (right-arranged first speaker)
10L (R) speaker (second speaker on the left)
10R (L) speaker (second speaker placed right)

Claims (3)

A keyboard having a plurality of keys provided corresponding to stereo-type musical sounds to be output;
The keyboard is attached, and a housing provided with an opening opened upward,
A left-arranged first speaker that is arranged on the bass side of the keyboard in the casing and outputs the left channel of the musical sound corresponding to the key depression toward the open portion of the casing;
A right-arranged first speaker that is arranged on the high-pitched side of the keyboard with respect to the left-arranged first speaker, and that outputs a right channel of the musical sound corresponding to pressing of the key toward an open portion of the housing;
In the casing, the left channel and the right channel are arranged on the back side of the keyboard relative to the first speaker, and are arranged on the bass side of the keyboard, and the right channel of the musical sound corresponding to the key depression of the key is arranged. A left-arranged second speaker that outputs toward the open portion of the housing;
In the housing, it is arranged on the back side with respect to the keyboard with respect to the left and right arranged first speakers, and is arranged on the treble side of the keyboard with respect to the left arranged second speaker. An electronic musical instrument comprising: a right-arranged second speaker that outputs a left channel of the musical sound corresponding to the sound toward an open portion of the housing.   The left and right-arranged second speakers are arranged at a distance that is shorter than the distance between the left and right-arranged first speakers, and are arranged within a separation range of the left and right-arranged first speakers. The electronic musical instrument according to claim 1, wherein the electronic musical instrument is a musical instrument. The casing is shaped like an acoustic grand piano that stretches a string from the keyboard side to the back side in the casing,
The left-arranged second speaker is arranged at a position corresponding to the arrangement position of the long pieces provided in the case when the case is assumed to be used as the acoustic grand piano.
The right second speaker is arranged at a position corresponding to an arrangement position of a short piece provided in the case when the case is assumed to be used as the acoustic grand piano. The electronic musical instrument according to claim 2.

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