JP5017656B2 - Electronic musical instrument with soundboard - Google Patents

Description

  The present invention relates to an electronic musical instrument with a soundboard, and particularly to an electronic musical instrument with a soundboard in which a plurality of vibrators are attached to one soundboard.

  In general, an electronic keyboard instrument detects a key depression state with a switch, calculates a detection result to generate a musical sound signal, and generates a sound by a speaker. However, an electronic musical instrument having a soundboard has been considered because the musical sound of a natural musical instrument cannot be better simulated only by pronunciation by a speaker. For example, Japanese Patent Laid-Open No. 53-69624 proposes an electric piano in which a plurality of vibrators are attached at positions along a string receiving piece of a soundboard in a conventional piano. This conventional electric piano is configured to cover the entire range of an acoustic piano with six vibrators.

Japanese Patent No. 2917609 discloses a grand piano in which a soundboard divided into a high-frequency soundboard with a small area and a low-frequency soundboard with a large area are provided, and a soundboard drive unit is attached to each.
JP-A-53-69624 Japanese Patent No. 2917609

  In the electric piano described in Patent Document 1, a plurality of vibrators are provided on one soundboard to cover the entire sound range, and vibrations from each vibrator are mixed with vibrations from other vibrators. Since the soundboard is vibrated, it is difficult to reproduce a clear tone.

  On the other hand, in the grand piano described in Patent Document 2, vibrations from each vibrator are not mixed with vibrations from other vibrators. However, it is necessary to individually manufacture sound boards for bass and treble and attach them individually to the instrument body. When a plurality of soundboards are attached to the instrument main body, each requires an attachment part, and each requires high accuracy, which increases man-hours.

  The present invention eliminates the above-mentioned problems and adopts a configuration in which the soundboard is vibrated with a vibrator corresponding to each of the low and middle and high ranges, while the vibration of one vibrator is the vibration of another vibrator. It is an object of the present invention to provide an electronic musical instrument with a soundboard that does not easily affect the sound and does not increase man-hours that require accuracy.

  To achieve the above object, the present invention provides an electronic device having a tone generator that generates a tone signal in response to a keyboard operation, and a soundboard as a sound system driven by the tone signal output from the tone generator. In a musical instrument, comprising: a damping member that partitions the sound board into a low vibration range and a middle / high vibration range; and a vibrator attached to each of the low vibration range and the middle / high vibration range, A first feature is that the apparatus is configured to be driven based on the musical sound signal.

  Further, in the present invention, the soundboard is a horizontally long rectangle, and the damping member forms the horizontally long rectangle having a low vibration region at a central portion and medium and high vibration regions respectively located on both sides of the low vibration region. There is a second feature in that it is a square member arranged opposite to at least two of the four corners of the soundboard.

  In addition, the present invention has a third feature in that the sound system includes a high-frequency speaker in addition to a soundboard that is vibrated by the vibrator.

  Furthermore, the present invention has a fourth feature in that the soundboard is attached to the rear surface of the electronic piano main body through a soundboard frame attached to an edge of the soundboard.

  According to the present invention having the first feature, the exciter is driven by the tone signal generated by the sound source device, and the soundboard vibrates to generate a tone corresponding to the tone signal. The soundboard is divided into a low vibration range and a medium and high vibration range by vibration control members, so that the vibration of the vibrator provided in each vibration range is difficult to be transmitted to other vibration ranges and faithful to the musical sound signal Optimal sound can be obtained. In particular, since a plurality of vibration regions can be formed on a single soundboard without providing a plurality of soundboards and only by providing a damping member, an increase in man-hours can be prevented.

  According to the present invention having the second feature, at least two medium-high vibration regions and a low vibration region sandwiched therebetween are arranged by disposing the damping members at least two of the four corners of the soundboard. Can be easily formed.

  According to the present invention having the third feature, apart from the musical sound generated by the soundboard, it is possible to generate musical sounds in a wide frequency band by generating high-frequency musical sounds that are difficult to sound on the soundboard.

  According to the present invention having the fourth feature, in the structure in which the soundboard is attached to the electronic piano main body via the frame, the advantage of partitioning the vibration region by the damping member is remarkable. When multiple vibration zones are formed with multiple soundboards without using damping members, it is necessary to add frames to each soundboard, and to increase the assembly accuracy of each soundboard with frames, increasing man-hours. There is a risk. However, according to the present invention, the process of attaching the frame to four sides of one soundboard and attaching the one soundboard to the electronic musical instrument main body is not different from the conventional one, and simply bonds the damping member. Therefore, there is an effect that it is possible to eliminate the fear that the number of man-hours will increase significantly.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a rear view of an electronic piano that is an electronic musical instrument according to an embodiment of the present invention. In FIG. 1, an electronic piano 1 has a main body 2 and a soundboard 3 attached to the rear surface of the main body 2. The sound board 3 is a horizontally long rectangular wooden board, and four sides are joined to the sound board frame 4. A plurality of (four in this example) sounding bars 5 are attached to the sounding board 3. The sounding bar 5 has a function of instantaneously transmitting vibration to the entire sounding board 3 and a function of giving a desired strength to the sounding board 3. Furthermore, vibration damping members 6 and 7 made of square material are attached to the soundboard 3. The damping members 6 and 7 are preferably made of the same material as the sounding rod 5, and both are joined to the sounding plate 3 by an adhesive and / or screws. The damping members 6 and 7 partition the soundboard 3 into a low vibration region A1 and two medium vibration regions A2 and A3. The low vibration area A1 is provided in a range sandwiched between the vibration damping members 6 and 7 at the central portion of the soundboard 3, and the medium and high vibration areas A2 and A3 are surrounded by the vibration damping members 6 and 7 and the soundboard frame 4. Provided at the corner of the soundboard 3.

  Exciters 8, 9, and 10 are fixed to the low vibration region A1 and the medium and high vibration regions A2 and A3, respectively. The vibrators 8, 9, and 10 are preferably, for example, a voice coil type in which a voice coil is disposed in a magnetic gap or a type using a piezoelectric element. The vibrators 8, 9 and 10 are attached to the back side of the soundboard 3, that is, inside the electronic piano 1.

  The low vibration area A1 has a large area to enable vibration with a relatively large amplitude, and the low vibration exciter 8 is biased laterally and vertically from the center of the low vibration area A1. It is provided at the position. On the other hand, the medium and high vibration areas A2 and A3 are smaller in area than the low vibration area A1, and the medium and high sound exciters 9 and 10 are arranged at substantially the center of the medium and high vibration areas A2 and A3, respectively.

  Furthermore, a pair of left and right treble speakers 11 and 12 are provided on the top of the electronic piano 1. The high-pitched speakers 11 and 12 are, for example, 2 cm dome tweeters, and are arranged in front of the electronic piano 1, that is, toward the performer.

  FIG. 2 is a system configuration diagram of the electronic piano 1. The electronic piano 1 includes a CPU 13, a program memory 14, a musical tone waveform memory 15, a RAM 16, a panel interface circuit 17, a keyboard interface circuit 18, an automatic performance data memory 19, a disk interface circuit 20, and a tone generator 21.

  An operation panel display device 22 is connected to the panel interface circuit 17, a keyboard 23 is connected to the keyboard interface circuit 18, and a floppy disk drive (FDD) 24 is connected to the disk interface circuit 20. In addition, a digital signal processor (DSP) 25, a digital / analog converter (DAC) 26, a filter 27, and an amplifier 28 are connected to the sound source device 21 in series. The output of the amplifier 28 is connected to the sound system 29. The sound system 29 includes high-frequency speakers 11 and 12 and a soundboard 3 that is vibrated by the vibrators 8, 9, and 10.

  The program memory 14 stores a program processed by the CPU 13, the musical sound waveform memory 15 stores musical sound waveform data, and the automatic performance data memory 19 stores automatic performance data. These memories 14, 15 and 19 can be constituted by ROM. The RAM 16 is used as a registration storage area such as a work area for temporarily storing various data when the CPU 13 executes a program, and a tone color and an effect set by operating the operation panel display device 22.

  The operation panel display device 22 includes various switches such as a touch panel and a registration switch, a volume, and an indicator lamp such as an LED, and is disposed on a control panel provided adjacent to the keyboard 23, for example.

  FIG. 3 is a detailed view of a main part of FIG. In FIG. 3, the sound source device 21, DSP 25, and DAC 26 each include a left channel Lch and a right channel Rch. The output side of the left channel Lch of the DAC 26 is connected to the left treble speaker 11 and the vibrator 9 in the middle / high vibration range A2 via the high-pass filter 271 and the amplifier 281, and the output side of the right channel Rch of the DAC 26 is the high-pass filter 272. The high-frequency loudspeaker 12 and the vibrator 10 in the middle / high vibration range A3 are connected via the amplifier 282. The left and right channels of the DAC 26 are connected to the vibrator 8 in the low vibration region A1 through the low-pass filter 273 and the amplifier 283.

  The meaning of “low sound”, “medium / high sound”, and “high sound” of the musical sound produced by the low-vibration vibrator 8, the mid-high vibration vibrators 9 and 10, and the high-pitched speakers 11 and 12 are as follows: The frequency band of the musical sound generated by the vibrators 9 and 10 is relatively higher than the frequency band of the musical sound generated by the vibrator 8, and is generated by the vibrators 9 and 10. This means that the frequency band of the musical sound produced by the high-pitched speakers 11 and 12 is relatively higher than the frequency band of the musical sound. Further, the frequency bands of the musical sounds generated by the respective vibrators 8, 9, 20 and the speakers 11, 12 have portions that overlap each other, and are set to cover, for example, 50 Hz to 15 kHz as a whole.

  In the above configuration, the CPU 13 controls the tone generator 21 as a tone generator based on the program, the key information input from the keyboard 23 and the tone color, tempo, rhythm, etc. input from the operation panel display device 22. A musical sound signal is generated based on the waveform data read from the memory 15. In the automatic performance mode, automatic performance data stored in the automatic performance data memory 19 is used in place of the key information input from the keyboard 23.

  The tone signal generated by the tone generator 21 is input to the DSP 25. The DSP 25 has an effect imparting function. The effect imparting function has functions for imparting a timbre effect and imparting a sound field effect such as reverb or resonance. The parameters for applying the effect are supplied to the DSP 25 by an address instruction from the CPU 13.

  The effect-added musical tone signal output from the DSP 25 is converted into an analog signal by the DAC 26. The output signal of the DAC 26 is input to the high pass filters 271 and 272 and the low pass filter 273. The high-pass filters 271 and 272 extract medium and high-frequency components from the input musical sound signal, and the low-pass filter 273 extracts a low-frequency component from the input musical sound signal.

  The output signal of the high-pass filter 271 is amplified by the amplifier 281 and input to the left treble speaker 11 and the vibrator 9 in the middle / high vibration range A2. The output signal of the high-pass filter 272 is amplified by the amplifier 282 and input to the right treble speaker 12 and the vibrator 10 in the middle / high vibration range A3. The output signal of the low-pass filter 273 is amplified by the amplifier 283 and input to the vibrator 8 in the low vibration region A1.

  In this way, a musical sound is generated from the two treble speakers 11, 12 by the musical sound signal, and the vibrators 8, 9, 10 are driven by the musical sound signal, and vibrations generated by the vibrators 8, 9, 10 are echoed. A musical sound is generated by being propagated to the plate 3.

  Since the soundboard 3 of the present embodiment is divided into the low vibration region A1 and the medium and high vibration regions A2 and A3 by the damping members 6 and 7, the sound plate 3 is mutually separated between the low vibration region A1 and the medium and high vibration regions A2 and A3. Vibration is difficult to be transmitted. Therefore, in each region, it is possible to generate an optimum musical sound that is less affected by the vibration of the soundboard 3 in other regions. In particular, since the vibration in the low vibration region A1 having a large amplitude is hardly transmitted to the medium and high vibration regions A2 and A3, clear medium and high sounds can be reproduced by the soundboard 3.

  In the present embodiment, the soundboard 3 is partitioned into three regions by the damping members 6 and 7, but the present invention is not limited to this, and it is partitioned into more regions, or the partition type is modified. it can.

  FIG. 4 is a diagram illustrating a modification example related to the arrangement of the damping member. In the example shown in FIG. 4A, the damping member 30 is arranged so as to face the four corners of the rectangular soundboard 3, and four middle / high vibration areas 31 are provided, and the center is the low vibration area 32. In each of the regions 31 and 32, vibrators 33 and 34 are arranged as shown. In this example, it is suitable for making the high frequency range more pronounced.

  The example shown in FIG. 4B is an example in which the damping member 35 is placed horizontally (horizontally) at the center of the soundboard 3, and the soundboard 3 is divided into an upper region 36 and a lower region 37. ing. In the upper region 36, medium and high tone vibrators 38, 38 are arranged, and in the lower region 37, a low tone vibrator 39 is arranged. According to this example, it is possible to increase the middle / high tone vibration region (upper region 37) to emphasize the middle / high tone.

  The example shown in FIG. 4C is an example in which the damping member 35 is vertically placed in the central portion of the sound board 3, and the sound board 3 is connected to the right side (left side in the figure) of the electronic piano, that is, the region 40 on the treble side. It is divided into a left side (right side in the figure) of the electronic piano, that is, a region 41 on the bass side. The region 40 is provided with a medium / high frequency exciter 43, and the region 41 is provided with a low frequency exciter 44. According to this example, middle and high tones can be emphasized, and middle and high tones can be pronounced corresponding to the key range of the keyboard 23.

  The present embodiment relates to the best mode of the present invention, and various modifications can be made without departing from the scope described in the claims. For example, the arrangement of the damping member can be modified other than that shown in FIG. 4, and the shape of the soundboard is not limited to a rectangle, but may be a simulation of the shape of a soundboard of a grand piano. Although FIG. 4 shows an example in which two medium and high tone vibrators are provided, the number of vibrators is not limited to this. In this embodiment, the dome tweeters are provided on the left and right. However, the sound generator is only the vibrator attached to the soundboard 3, and the speaker may not be provided as the other sound generator. A speaker other than the dome tweeter may be used in combination. In short, a single soundboard provided in the electronic musical instrument is divided into a plurality of vibration regions by a damping member, and a vibration exciter for low vibration is attached to one of the plurality of vibration regions, What is necessary is just to attach the vibrator for middle and high vibrations to other vibration regions.

It is a rear view of the electronic piano which concerns on one Embodiment of this invention. It is a block diagram which shows the system configuration | structure of the electronic piano which concerns on one Embodiment of this invention. It is a principal part detail drawing of a system configuration. It is a figure which shows the modification which concerns on arrangement | positioning of the damping member attached to a sound board.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Electronic piano, 3 ... Sound board, 4 ... Sound board frame, 5 ... Sound bar, 6, 7 ... Damping member, 8 ... Low vibration vibrator, 9, 10, ... Medium / high vibration vibrator, 11 , 12 ... Speaker for high sound, 21 ... Sound source device

Claims (3)

In an electronic musical instrument having a sound source device that generates a musical sound signal in response to an operation of a keyboard, and a soundboard as a sound system driven by the musical sound signal output from the sound source device,
A damping member that divides the soundboard into a low vibration region and a medium-high vibration region;
Comprising a vibrator attached to each of the low and middle and high vibration ranges,
The exciter is configured to be driven based on the musical sound signal ,
The soundboard is a horizontally long rectangle, and the damping member forms four corners of the soundboard so that the horizontally long rectangle forms a low-vibration region at a central portion and middle-high vibration regions respectively located on both sides of the low-vibration region. soundboard with an electronic musical instrument according to claim timbers der Rukoto disposed to face at least two corners of the. The sound system, sound board with an electronic musical instrument according to claim 1, wherein Rukoto comprise a tweeter in addition to soundboard is vibrated by said vibrator. Claim 1 or 2 soundboard with electronic musical instrument wherein the sound board is characterized that you have attached to the rear surface of the electronic piano through the soundboard frame attached to the edge of該響plate.

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