JP2008299052A - Electronic keyboard musical instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic keyboard musical instrument capable of obtaining musical sound with good quality similar to an acoustic piano, and a rich performance expression, by generating acoustic resonance sound according to an operation state of a damper pedal, in the electronic musical keyboard instrument which generates a musical sound by vibrating a sound board. <P>SOLUTION: The electronic keyboard musical instrument includes: a plurality of keys; a musical sound generating device for generating a musical sound signal SLO according to a key pressing state of the plurality of keys; the sound board 23; a sound board vibrator 27 attached to the sound board 23, which is driven based on the generated musical sound signal SLO, and which generates the musical sound by vibrating the sound board 23; a plurality of snares 51; the damper pedal operated by a player; and a snare vibrator 52 which is driven by the damper pedal operated by the player and a detected operation amount AP of the damper pedal, and which generates a resonance sound by vibrating the snare 51. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electronic keyboard instrument such as an electronic piano provided with sound lines for generating resonance.

  Conventionally, as an electric piano provided with such a sound ray, for example, one disclosed in Patent Document 1 is known. This electric piano is provided with an upright piano body, a plurality of keys provided on the piano body, a hammer, a vibrating piece and a pickup provided for each key, a soundboard, and a soundboard. It is equipped with an exciter and multiple sound lines.

  In this electric piano, when a key is pressed, the vibration piece is struck with a hammer, and the vibration of the vibration piece generated thereby is converted into an electric signal by the pickup, and this electric signal is input to the vibrator. As a result, the vibrator vibrates, causing the soundboard and the soundline to vibrate simultaneously. As a result, the resonance sound generated in the sound line is added to the musical sound generated in the sound board, so that a natural performance sound different from that emitted from the speaker can be obtained.

  However, in the acoustic piano, the resonance sound as described above is generated in response to the player's depression of the damper pedal, so that the volume and tone color become rich, and the performance expression becomes rich. On the other hand, in this conventional electric piano, the sound line and the sound board are vibrated by the vibrator based on the vibration of the vibration piece generated when the key is depressed. The start / end timing of the occurrence is the same as the key pressing strength and timing. For this reason, unlike an acoustic piano, a resonance sound corresponding to the operation state of the damper pedal cannot be generated, and the performance expression becomes monotonous.

  The present invention has been made to solve such a problem, and in an electronic keyboard instrument that generates a musical sound by vibrating a soundboard, an acoustic resonance sound corresponding to the operation state of a damper pedal is generated. Therefore, an object of the present invention is to provide an electronic keyboard instrument that can realize high-quality performance sounds and rich performance expressions similar to an acoustic piano.

Japanese Utility Model Publication No.57-31340

  In order to achieve the above object, an electronic keyboard instrument according to claim 1 of the present invention includes a plurality of keys, a musical sound generation device that generates a musical sound signal according to the depressed state of the plurality of keys, a soundboard, A soundboard exciter that is attached to a board and is driven based on the generated musical sound signal to generate a musical sound by vibrating the soundboard, a plurality of sound lines, and a damper pedal operated by a player And a pedal sensor that detects an operation amount of the damper pedal, and a sound wave exciter that is driven according to the detected operation amount of the damper pedal and generates a resonance sound by vibrating the sound line. It is characterized by that.

  According to this electronic keyboard instrument, a musical tone signal is generated by the musical tone generation device in accordance with the key depression state, and the soundboard exciter is driven based on the musical tone signal to vibrate the soundboard. Musical sound is generated and emitted from the soundboard. In this way, the sound board is vibrated and the musical sound is emitted from the entire wide surface, so that, for example, compared with the case where a cone speaker is used, a high quality with a sense of depth, spread and volume approximated by an acoustic piano. A performance sound can be obtained.

  In addition, the acoustic wave exciter is driven to vibrate a plurality of acoustic lines, thereby generating an acoustic resonance sound and adding it to the musical sound. Thereby, it is possible to obtain a high-quality performance sound that is more similar to an acoustic piano. Furthermore, since the sound line exciter is driven according to the amount of operation of the damper pedal, the intensity of the resonance and the start / end timing of generation can be controlled independently of the musical sound. As a result, a damper pedal effect similar to that of an acoustic piano can be obtained, and further high-quality performance sounds and rich performance expressions can be realized.

  According to a second aspect of the present invention, in the electronic keyboard instrument according to the first aspect of the present invention, a plurality of sound lines and sound line vibrators are provided on the sound board.

  According to this configuration, since the sound line is provided on the sound board, the resonance sound generated along with the vibration of the sound line is also emitted from the entirety through the sound board. Therefore, it is possible to obtain a good performance sound that is more similar to an acoustic piano.

  The invention according to claim 3 is the electronic keyboard musical instrument according to claim 1, further comprising a sound wave mounting plate provided separately from the sound board, wherein the plurality of sound waves and the sound wave exciter are sound wave mounting plates. It is provided in.

  According to this configuration, the sound ray mounting plate is vibrated by the sound ray exciter, so that the sound ray vibrates and a resonance sound is generated. In addition, since the sound line is provided on a sound wave mounting plate that is separate from the sound board, when the damper pedal is not operated, the sound line is less likely to resonate unnecessarily with the vibration of the sound board. A performance sound can be obtained. On the other hand, when the damper pedal is operated, the sound line can be vibrated by the sound line vibrator without being directly affected by the vibration of the sound board, so that the resonance sound can be generated satisfactorily.

  Further, in this configuration, the resonance sound generating system consisting of the sound wave exciter, the sound wave mounting plate and the sound wave is separated from the musical sound generating system consisting of the sound wave plate exciter and the sound board. A drive signal for driving the instrument can be generated separately from the musical sound signal. In that case, the drive signal only needs to have a function of vibrating the sound line, and may be, for example, a simpler waveform, thereby simplifying the control of the resonance sound.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. 1 and 2 show an upright electronic piano to which the present invention is applied. The electronic piano 1 includes a piano body 2 and a stand unit 3 that supports the piano body 2. Parent plates 4 and 4 are respectively attached to the left and right side surfaces of the piano body 2 and the stand unit 3 so as to cover them.

  The exterior of the piano body 2 is between the left and right arms 5, 5, the horizontal shelf 6 and the top 7 that extend between the lower ends and the upper ends of the arms 5, 5, and the rear ends of the arms 5, 5. It is comprised with the backplate 8 etc. which cover. In the piano body 2, a keyboard device 9, an operation panel 10, a middle / high tone speaker 11, a high tone speaker 12, and the like are provided. Reference numeral 7 a shown in FIG. 1 and the like is a music stand attached to the top plate 7.

  The keyboard device 9 includes a keyboard 14 composed of a large number of keys 13 arranged in parallel in the left-right direction on the shelf board 6, and a hammer that is provided for each key 13 and rotates in conjunction with the depressed key 13 (see FIG. And a key sensor 15 (see FIG. 5) that is provided for each key 13 and detects the key depression information. The key 13 is mainly made of a wood material, is configured in substantially the same way as an acoustic upright piano key, and is rotatably supported at the center thereof. The key sensor 15 is composed of a rubber switch or the like, and detects the presence / absence (on / off) of key pressing of the corresponding key 13 and the key pressing speed (velocity) via a hammer that rotates as the key is pressed.

  The operation panel 10 is disposed above the keyboard 14, and includes operation buttons and operation levers for setting the tone, volume, sound effect, and the like of the electronic piano 1, and a display for displaying the setting state thereof. Is provided.

  The middle / high tone speaker 11 is composed of four mid-range speakers, and mainly reproduces a middle / high tone component of a musical tone. As shown in FIG. 3, a sound emitting surface is provided at an upper rear end portion in the piano body 2. Are arranged in a state of facing upward. The treble speaker 12 is composed of two dome tweeters, and mainly reproduces the treble component of the musical sound. The piano lid 2 has an opening 17 for sliding the keyboard cover 16 at the left and right ends (see FIG. 1). The sound emitting surface faces forward, and is arranged.

  As shown in FIG. 3 and the like, the stand unit 3 includes left and right end bases 18, 18, side plates 19, 19, shelf support columns 20, 20, pedal base 21, lower front plate 22, soundboard 23, cover plate 24, and the like. Is assembled in a box shape.

  The pedal base 21 is connected between the rear parts of the end bases 18 and 18 and extends in the left-right direction, and three pedals 25 including a right damper pedal 25 are rotatably provided at the center ( (See FIG. 1). Each pedal 25 is provided with a pedal sensor 26 (see FIG. 5) that detects the presence or absence (on / off) of the operation, and the operation amount AP of the damper pedal 25 is further detected. The lower front plate 22 is provided so as to cover the front end of the space surrounded by the left and right side plates 19, 19, the pedal base 21 and the lid plate 24.

  In addition, a soundboard exciter 27 is attached to the front surface of the soundboard 23, and a soundboard speaker 28 is configured by both 23 and 27. The sound board 23 is formed by joining together a plurality of strips made of spruce or the like, like the sound board of an acoustic upright piano. A plurality of sounding bars 29 are attached to the back of the sounding board 23. These sounding bars 29 are for increasing the transmission speed of vibration in the sounding board 23 and extend obliquely in parallel with each other.

  On the other hand, at the rear end portion of the space in which the lower front plate 22 is arranged, a turn 23a is attached along the outer periphery thereof. The soundboard 23 is fixed to the front surface of the driving device 23a and is provided so as to cover the back surface of the stand unit 3 (see FIG. 2).

  The soundboard exciter 27 is, for example, an electromagnetic type, and is attached to a predetermined position slightly lower than the center of the front surface of the soundboard 23 as shown in FIG. The soundboard exciter 27 is driven based on a musical sound signal SLO output from a musical sound generating device 30 to be described later when the key 13 is depressed, and vibrates the soundboard 23 to generate a musical sound from the soundboard 23. generate.

  As shown in FIG. 4, a plurality of (for example, twelve) sound lines 51 and a sound wave exciter 52 for resonating the sound lines 51 are attached to the front surface of the sound board 23.

  The reverberation line 51 is composed of a piano wire or the like, has a predetermined length different from each other, and has a horizontal upper piece 53 fixed to the high-pitched sound side of the front face of the soundboard 23 and a lower piece 54 extending obliquely. It is stretched between. More specifically, the upper piece 53 is provided with the same number of tuning pins 55 as the sound ray 51 (only one is shown), and the lower piece 54 is provided with the same number of hitch pins 56 (only one is shown). The sound line 51 is stretched between the pins 55 and 56.

  In addition, the tension of each sound ray 51 is adjusted by the tuning pin 55, so that the sound ray 51 is tuned to constitute 12 scales of C, C #, D,... A #, B. .

  The sound wave exciter 52 is, for example, an electromagnetic type, similar to the sound board exciter 27, and is attached to a predetermined position near the sound line 51 of the sound board 23. The reverberation vibrator 52 is driven by a musical sound signal SLO output from the musical sound generating device 30 in accordance with the operation of the damper pedal 25, and thereby vibrates the reverberant line 51 via the sound board 23, thereby resonating. Generate sound.

  As shown in FIG. 5, the tone generator 30 includes a sensor scan circuit 31, a panel scan circuit 32, a CPU 33, a ROM 34, a RAM 35, a tone generator circuit 36, a waveform memory 37, a DSP 38, and left and right channel D / A converters 39L. 39R, middle and high tone filters 40L and 40R, middle and high tone power amplifiers 41L and 41R, an adder 42, a low tone filter 43 and a low tone power amplifier 44.

  Based on the detection signal of the key sensor 15, the sensor scan circuit 31 receives on / off information of the key 13, key number information that identifies the key 13 that is turned on or off, and touch data that represents the velocity of the key 13 that is turned on. The key 13 is output to the CPU 33 as key pressing information data. The sensor scan circuit 31 outputs on / off information of each pedal 25 and the operation amount AP of the damper pedal 25 to the CPU 33 as operation information data of the pedal 25 based on the detection signal of the pedal sensor 26.

  The panel scan circuit 32 detects the operation state of the operation button or the operation lever, and outputs it to the CPU 33 as operation information data.

  The CPU 33 generates a control signal for generating a tone signal SM, which will be described later, in accordance with a control program stored in the ROM 34 in accordance with the key depression information data from the sensor scan circuit 31 and the operation information data of the pedal 25. The sound is output to the sound source circuit 36. In addition, the CPU 33 searches the fixed data stored in the ROM 34 according to the operation information data from the panel scan circuit 32, thereby generating an acoustic signal for controlling the timbre, volume and acoustic effect, and outputs it to the DSP 38. To do.

  Further, the CPU 33 searches the table shown in FIG. 6 according to the operation amount AP of the damper pedal 25 to calculate an amplitude M to be multiplied by a resonance sound waveform signal SD, which will be described later, and represents the calculated amplitude M. The data is output to the DSP 38. In this table, the amplitude M is set to a value of 0 when the operation amount AP = 0, that is, when the damper pedal 25 is not operated, and is set to a larger value as the operation amount AP is larger. Has been.

  In addition to the control program executed by the CPU 33, the ROM 34 stores fixed data for control for controlling tone color, volume, and sound effects. These fixed data are set for each of the left and right channels. The RAM 35 temporarily stores status information indicating the operation state of the electronic piano 1 and is also used as a work area for the CPU 33.

  The tone generator circuit 36 reads the musical sound waveform data and envelope data from the waveform memory 37 in accordance with the control signal from the CPU 33, adds the envelope data to the read musical sound waveform data, thereby generating a musical sound signal SM as the original sound, and the DSP 38. Output to. Further, the sound source circuit 36 reads the resonance waveform data DR from the waveform memory 37 and outputs it to the DSP 38 when the damper pedal 25 is operated.

  The DSP 38 branches the input musical sound signal SM into the musical sound signals of the left and right channels, and adds a predetermined acoustic effect to these musical sound signals according to the acoustic signal from the CPU 33. The DSP 38 multiplies the resonance sound waveform data DR by the amplitude M from the CPU 33 and adds it to the left and right music signals to generate the left and right music signals SL and SR, and the D / A converter 39L, Output to 39R respectively.

  The D / A converters 39L and 39R convert the digital musical tone signals SL and SR into analog musical tone signals SLA and SRA, and then output them to the medium and high tone filters 40L and 40R and the adder 42.

  The medium and high tone filters 40L and 40R are configured by bandpass filters, and pass the frequency components corresponding to the middle and high frequencies of the musical tone signals SLA and SRA, and are used as the musical tone signals SLMH and SRMH as the middle and high tone power amplifiers. Output to 41L and 41R, respectively.

  The medium and high tone power amplifiers 41L and 41R amplify the musical tone signals SLMH and SRMH with a predetermined gain, and then output the left channel musical tone signal SLMH to the two left and right middle and high tone speakers 11 and 11 and the treble speaker 12. At the same time, the musical sound signal SRMH of the right channel is output to the two middle and high tone speakers 11 and 11 and the high tone speaker 12 on the right side.

  The middle / high tone speaker 11 and the high tone speaker 12 reproduce the musical sound signals SLMH and SRMH, respectively, and emit the musical sound as musical sounds.

  The adder 42 adds the musical sound signals SLA and SRA of the left and right channels, and then outputs them to the bass filter 43.

  The bass filter 43 is also composed of a band-pass filter, and passes the frequency component corresponding to the low frequency band of the musical sound signal output from the adder 42 to the bass power amplifier 44 as a musical sound signal SLO. Output.

  The bass power amplifier 44 amplifies the musical sound signal SLO with a predetermined gain, and then outputs it to the soundboard vibrator 27 and the soundline vibrator 52. As a result, the soundboard exciter 27 is driven based on the musical sound signal SLO and vibrates the soundboard 23, thereby generating a musical sound from the soundboard 23. Further, the sound line exciter 52 is driven based on the musical sound signal SLO, and the sound line 51 is vibrated through the sound board 23, thereby generating a resonance sound.

  As described above, according to the present embodiment, the musical tone signal SLO is generated according to the depressed state of the key 13 detected by the key sensor 15, and the soundboard exciter 27 is driven based on the musical tone signal SLO. Then, by vibrating the soundboard 23, a musical sound is generated and emitted from the soundboard 23. As described above, since the musical sound is emitted from the entire wide surface of the soundboard 23, for example, compared with a case where a cone speaker is used, a high-quality performance sound having a sense of depth, spread and volume approximated by an acoustic piano. Can be obtained.

  Also, when the damper pedal 25 is operated, the acoustic line 51 is vibrated by the acoustic line exciter 52 so that an acoustic resonance is generated and added to the musical tone. Can be obtained. Further, as the operation amount AP of the damper pedal 25 is larger, the amplitude M multiplied by the resonance sound waveform data DR is set to a larger value, and the sound is resonated based on the musical sound signal SLO including such resonance sound waveform data DR. Since the line exciter 52 is driven, the intensity of the resonance and the start / end timing of generation can be controlled independently of the musical sound. As a result, a damper pedal effect similar to that of an acoustic piano can be obtained, and further high-quality performance sounds and rich performance expressions can be realized.

  In addition, since the sound line 51 is provided on the sound board 23, the resonance sound generated along with the vibration of the sound line 51 is also emitted from the whole through the sound board 23. Therefore, it is possible to obtain a good performance sound that is more similar to an acoustic piano. In addition, since the sound line 51 and the sound wave exciter 52 are arranged on the sound board 23 and a separate mounting plate for attaching them is unnecessary, the number of parts and the number of assembly steps can be reduced. Cost can be reduced.

  In the present embodiment, the sound beam exciter 52 is configured separately from the soundboard exciter 27, but may be configured as a single exciter by sharing both. Thereby, the number of vibrators can be reduced, and the manufacturing cost can be reduced.

  FIG. 7 shows an electronic piano according to a second embodiment of the present invention. Of the constituent elements of the present embodiment, those having the same configuration as that of the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 7, in the electronic piano 61 of the present embodiment, the sound wave 51 and the sound wave exciter 52 are provided not on the sound board 23 but on the back surface of the lower front plate 22 disposed on the front side thereof. Yes. That is, the lower front plate 22 is used as a sound wave mounting plate for mounting the sound wave 51 and the sound wave vibrator 52.

  Further, in the present embodiment, a musical sound signal such as a musical sound signal SLO and a driving signal SD for driving the sound ray exciter 52 are generated by the musical sound generating device 62 shown in FIG. 8 as follows. .

  For the musical sound signals SLMH, SRMH, and SLO, the DSP 38 generates the musical sound signals SL, SR based on the musical sound waveform data and envelope data read from the waveform memory 37 without using the resonance sound waveform data DR. And generated in the same manner as in the first embodiment.

  The drive signal SD is generated as follows, separately from the musical tone signals SLMH, SRMH and SLO. First, the CPU 33 generates a control signal for generating the drive signal SD according to the operation information data of the damper pedal 25 from the sensor scan circuit 31 and outputs the control signal to the sound source circuit 36.

  Further, the CPU 33 searches the predetermined table according to the operation amount AP of the damper pedal 25 to calculate the amplitude MD of the drive signal SD, and outputs data representing the calculated amplitude MD to the DSP 38. Although not shown, in this table, similarly to the amplitude M in the table of FIG. 6, the amplitude MD is set to a value of 0 when the operation amount AP = 0, and linearly increases as the operation amount AP increases. Is set to

  The tone generator circuit 36 reads the drive signal waveform data DD from the waveform memory 37 in accordance with the control signal from the CPU 33 and outputs it to the DSP 38. The drive signal SD only needs to drive the sound wave exciter 52 and cause the sound wave 51 to resonate. Therefore, the drive signal waveform data DD differs from the musical sound waveform data, for example, a relatively simple waveform, for example, It is set to form a sine wave.

  The DSP 38 generates the drive signal SD by multiplying the drive signal waveform data DD output from the tone generator circuit 36 by the amplitude M from the CPU 33. In this case, the frequency of the drive signal SD is set to a predetermined frequency (for example, 40 Hz or less) belonging to the inaudible region in order to make it difficult to hear the sound due to the vibration of the sound line vibrator 52 itself.

  The generated drive signal SD is converted into an analog signal by the D / A converter 63, further amplified with a predetermined gain by the power amplifier 64, and then output to the sound wave exciter 52. As a result, the sound wave exciter 52 is driven and the sound wave 51 is vibrated through the lower front plate 22 to generate a resonance sound, which is added to the musical sound generated from the sound plate 23, thereby causing a damper. A pedal effect is added. Other configurations are the same as those of the first embodiment.

  As described above, according to the present embodiment, since the sound line 51 is attached to the lower front plate 22 that is separate from the sound board 23, the sound line 51 vibrates the sound board 23 when the damper pedal 25 is not operated. This makes it easier to resonate unnecessarily, resulting in a clear performance sound. On the other hand, when the damper pedal 25 is operated, the sound line 51 can be vibrated by the sound line vibrator 52 without being directly affected by the vibration of the sound board 23, so that the resonance sound can be generated satisfactorily. it can.

  In addition, the drive signal SD for driving the sound beam exciter 52 is generated separately from the musical sound signal SLO output to the soundboard exciter 27, and the waveform is composed of a simple sine wave. Therefore, the control of the resonance sound can be further simplified.

  In this embodiment, the sound line 51 and the sound wave exciter 52 are attached to the lower front plate 22, but may be attached to the sound plate 23, or separately from the lower front plate 22 and the sound plate 23. A dedicated mounting plate may be provided on the cover plate 24 of the stand unit 3 and attached to the mounting plate.

  In addition to the above, the present invention is not limited to the embodiments and can be implemented in various modes. For example, in the embodiment, the intensity of the resonance sound due to the sound line 51 is set according to the operation amount AP of the damper pedal 25. In addition, a dedicated volume or the like is provided on the operation panel 10, The player may be able to change the operation.

  Moreover, the sound ray 51 shown in the embodiment is merely an example, and the number and the configuration of attachment can be appropriately changed. Further, the embodiment is an example in which the present invention is applied to an upright electronic piano, but the present invention is not limited to this, and is applied to other appropriate types of electronic keyboard instruments such as a grand electronic piano. can do. In addition, it is possible to appropriately change the detailed configuration within the scope of the gist of the present invention.

1 is a perspective view of an electronic piano to which the present invention is applied. It is a rear view of the electronic piano of FIG. It is a partial sectional side view of the electronic piano by 1st Embodiment. It is a front view of the sound board of the electronic piano of FIG. It is a circuit block diagram which shows the musical sound production | generation apparatus of the electronic piano of FIG. It is a table for setting the amplitude by which resonance sound waveform data is multiplied. It is a partial sectional side view of the electronic piano by 2nd Embodiment. It is a circuit block diagram which shows the musical sound production | generation apparatus of the electronic piano of FIG.

Explanation of symbols

1 Electronic piano (electronic keyboard instrument)
13 Key 22 Lower front plate (Sound ray mounting plate)
23 sound board 25 damper pedal 26 pedal sensor 27 sound board exciter 30 musical sound generator 51 sound line 52 sound line exciter 61 electronic piano (electronic keyboard instrument)
62 Music generator SLO Music signal AP Damper pedal operation

Claims (3)

Multiple keys,
A musical sound generating device for generating a musical sound signal in accordance with the depressed state of the plurality of keys;
Soundboard,
A soundboard exciter that is attached to the soundboard and is driven based on the generated musical sound signal to generate a musical sound by vibrating the soundboard;
Multiple sound lines,
A damper pedal operated by the performer;
A pedal sensor for detecting the operation amount of the damper pedal;
A sound wave exciter that is driven according to the detected amount of operation of the damper pedal and generates a resonance sound by vibrating the sound line;
An electronic keyboard instrument characterized by comprising:   The electronic keyboard instrument according to claim 1, wherein the plurality of sound lines and the sound wave exciter are provided on the sound board. A sound line mounting plate provided separately from the sound plate;
The electronic keyboard instrument according to claim 1, wherein the plurality of sound rays and the sound wave exciter are provided on the sound ray mounting plate.

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