JPH1011055A - Electronic keyboard musical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the quality of a reproduced sound by delaying the output of a musical sound signal from a musical sound signal generating means to another speaker. SOLUTION: One of branched signals of a musical sound signal SL for a left speaker is outputted from the tweeter of the left speaker as a musical sound signal SLH for the tweeter and the other musical sound signal SL is delayed by a specific delay value D through a delay circuit 26L and then outputted from the woofer of the left speaker. Similarly, one of branched signals of a musical sound signal SR for a right speaker is outputted as a musical sound signal SRH as it is and reproduced by the tweeter of the right speaker, and the other is delayed by the same delay value D through a delay circuit 26R, outputted as a musical sound signal SRL, and reproduced by the woofer of the left speaker. Then those delay values D are decided by dividing the difference between the distances from the woofer and tweeter to the ears of a player by a sound velocity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic keyboard instrument such as an electronic keyboard or an electronic piano having a plurality of speakers dedicated to each frequency band.

[0002]

2. Description of the Related Art As a recent electronic keyboard instrument, a two-way loudspeaker device in which an audible frequency band is divided into a bass range and a treble range and speakers for each band are provided for reproduction, and a frequency band is used. Another stage, which is equipped with a divided 3-way speaker device, is increasing. In such an electronic keyboard instrument, sound quality can be improved by using speakers suitable for reproduction in respective frequency bands.

FIG. 6 shows an example of a conventional electronic keyboard having a two-way speaker. As shown in FIG.
Key 53 at the front and left and right speakers 54, 54 at the rear.
, Respectively. Each speaker 54 has a woofer (speaker for low frequency range) 55 and a tweeter (speaker for high frequency range) 56.
2, while each woofer 55 is located in the rear corner.
Are arranged on the front side of the tweeter 56 and closer to the center.

[0004]

In the conventional electronic keyboard 51, since the woofer 55 and the tweeter 56 are arranged as described above, the distance between the woofer 55 and the player P is increased as shown in FIG. The distance LB between the tweeter 56 and the player P is larger than the distance LA. Therefore, the musical sound radiated from the tweeter 56 is smaller than the musical sound radiated from the woofer 55 at the same time.
The sound reaches the player P's ear with a delay, and as a result, a phase shift occurs between the low frequency range and the high frequency range, so that the balance of the reproduced sound is lost and the sound quality is deteriorated.

The present invention has been made in order to solve such a problem, and reproduces musical tones radiated from a plurality of speakers by causing the musical tones to reach a player without causing a phase shift therebetween. It is an object of the present invention to provide an electronic keyboard instrument capable of improving sound quality.

[0006]

In order to achieve this object, an electronic keyboard instrument of the present invention comprises a plurality of keys and a plurality of keys having a plurality of frequency bands different from each other in accordance with key press information of the plurality of keys. A tone signal generating means for generating and outputting a tone signal of the musical tone, a plurality of speakers for reproducing a plurality of tone signals output from the tone signal generating means and emitting a tone, and a player among the plurality of speakers. Delaying the output of the tone signal from the tone signal generating means to another speaker with a delay time corresponding to the difference between the distance between the farthest speaker and the player and the distance between the other speaker and the player. And a delay circuit for causing the delay circuit.

According to this electronic keyboard instrument, the tone signal generating means generates and outputs a plurality of tone signals having a plurality of frequency bands in accordance with key press information of a plurality of keys. The tone signals are reproduced to emit the tone. The delay circuit provides a delay time corresponding to the difference between the distance between the speaker farthest from the player and the player and the distance between the other speaker and the player from the tone signal generation means to the other speakers. Delays the output of the tone signal. Therefore, the emission of musical sound from the speaker close to the performer
Than the emission of musical sounds from the speakers farthest from the performer,
By delaying by a delay time corresponding to the difference in distance from the performer, the phase between the musical tones can be made to coincide with each other when the sound reaches the performer. That is, a phase shift between musical sounds due to a difference in distance to a player can be corrected and eliminated by a delay by a delay circuit, so that a good balance of reproduced sounds is maintained and sound quality is improved.

In this case, the delay time is determined as a value obtained by dividing the difference between the distance between the speaker and the player farthest from the player from the distance between the other speakers and the player by the speed of sound. Is preferred.

According to this configuration, when the musical sound is emitted from both speakers at the same time, the radiated musical sound from the farthest loudspeaker is performed more than the radiated musical sound from the other speakers when the musical sound is radiated from both speakers at the same time. Is equal to the delay time when arriving late. Accordingly, the phase shift between the musical tones at the time when the music reaches the performer is completely eliminated, and the balance of the reproduced sound is kept at the best, and the sound quality is surely improved.

Further, the present invention is an electronic keyboard instrument having a plurality of speakers for reproducing sounds in a plurality of mutually different frequency bands and emitting musical sounds, wherein the plurality of speakers are respectively provided from the respective speakers. It is characterized by being arranged such that the distances to the players playing the electronic keyboard instrument are equal to each other.

In this electronic keyboard instrument, a plurality of speakers are arranged at the same distance from the performer.
Therefore, the plurality of musical tones simultaneously emitted from the respective speakers simultaneously reach the performer without causing a phase shift. As a result, the phase shift between the musical sounds emitted from each speaker is eliminated, so that the balance of the reproduced sound is maintained well and the sound quality is improved.

In this case, it is preferable that the plurality of speakers be arranged on an arc centered on the player when the electronic keyboard instrument is viewed in a plan view. With this configuration, the speakers can be appropriately and simply arranged such that the horizontal distances between the speakers are equal to each other.

In this case, it is preferable that the plurality of speakers are arranged at the same height. In this configuration, a plurality of speakers are arranged at the same height as each other, and in addition to the equal horizontal distance between the speakers, the distance between each speaker and the player becomes completely equal. Is completely eliminated.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a configuration of an electronic keyboard to which the present invention is applied. As shown in FIG. 1, the electronic keyboard 1 includes a plurality of keyboards 2 and a touch detection circuit 3 for detecting key press information of the keyboards 2.
An operation panel unit 4, a panel scan circuit 5 for detecting an operation state of the operation panel unit 4, and a tone signal generation circuit (tone) for generating a tone signal in accordance with detection results of the touch detection circuit 3 and the panel scan circuit 5. Signal generating means) 6;
There is provided a reproducing section 7 for reproducing and outputting the tone signal generated by the tone signal generating circuit 6. The reproducing unit 7 is a stereo type including left and right speakers 8L and 8R, and each speaker 8 is a two-way type including a tweeter 9 for reproducing a high frequency range and a woofer 10 for reproducing a low frequency range. .

The keyboard 2 includes a main body case 1 as shown in FIG.
1 includes a key 2a disposed at the front of the key 1 and a key switch (not shown) that opens and closes in response to key press / release of the key 2a. The on / off states of all the key switches are detected by a keyboard scan circuit (not shown) and then sent to the touch detection circuit 3. The touch detection circuit 3 outputs on / off information of the key 2a and information for specifying the turned on or off key 2a (key number) based on a signal indicating on / off of the key switch sent from the keyboard scanning circuit. ) And the key 2a turned on
Touch data indicating the touch intensity (velocity) of the touch is generated. The on / off information, the key number, and the touch data are output to the CPU 13 of the musical tone signal generation circuit 6 through the system bus 12 as a detection signal of the key press information of the key 2a.

The operation panel section 4 is arranged at the rear center of the main body case 11 (see FIG. 3), and although not shown, various panel switches such as a power switch, a mode designation switch, and a tone selection switch, and their settings are set. An indicator or the like for displaying the status is provided. The panel scan circuit 5 detects whether each of the various panel switches of the operation panel unit 4 is in a set state or a reset state, and outputs panel switch data indicating the set state via the system bus 12. , To the CPU 13 of the tone signal generation circuit 6.

The tone signal generation circuit 6 includes a CPU 13, an RO
M14, RAM 15, waveform memory 16, sound source circuit 17,
Digital signal processor (hereinafter "DSP")
18, four digital-analog converters (hereinafter "D /
A) 19 and two high-pass filters 20 and two low-pass filters 21 (hereinafter referred to as “H”, respectively).
PF "and" LPF "). CPU 1
3, the ROM 14, the RAM 15, and the sound source circuit 17, and the touch detection circuit 3 and the panel scan circuit 5 described above are mutually connected via a system bus 12.

The CPU 13 is a central processing unit for controlling the operation of the entire electronic keyboard 1.
In addition, in accordance with the detection signal output from the panel scan circuit 5, control of the tone generator 17 for generating a tone signal is performed.

The ROM 14 stores, in addition to the above-mentioned control program executed by the CPU 13, fixed data for control such as volume and tone used by the CPU 13.
In addition, the RAM 15 temporarily stores data indicating the operation state of the electronic keyboard 1 and the like.
It is also used as a work area.

The waveform memory 16 is composed of, for example, a ROM, and stores tone waveform data and envelope data corresponding to the type and range of a tone. Sound source circuit 17
Stores waveform data and envelope data corresponding to a control signal output from the CPU 13 in the waveform memory 16.
, And by adding envelope data to the read musical tone waveform data, a digital musical tone signal S is generated.

The DSP 18 applies a predetermined sound processing to the musical tone signal S output from the tone generator circuit 17, and generates the musical tone signals SLH and SLL for the tweeter 9 of the left speaker 8L and the woofer 10 and the tweeter 9 of the right speaker 8R. A total of four tone signals, ie, tone signals SRH and SRL for the woofer 10 and for the woofer 10, are generated. The configuration and operation of the DSP 18 will be described later in detail.

Each of the four D / As 19 is a DSP 18
Digital tone signals SLH, SLL, S output from
RH and SRL are converted into analog musical sound signals.
Of these analog-converted tone signals, tone signals SLH and SRH for the tweeter 9 correspond to the corresponding HPF 20
By removing a predetermined low-frequency component at, the tone signal SLL, S for the woofer 10 is obtained while a high-tone signal is obtained.
The RL is converted into a low-frequency signal by removing a predetermined high-frequency component by the corresponding LPF 21.

As described above, the reproducing unit 7 includes the tweeter 9
And a woofer 10 and left and right speakers 8L and 8R, respectively. Each tweeter 9 includes an amplifier 22;
An amplifier 23 is connected to each woofer 10. The amplifiers 22 and 22 amplify the high-range musical tone signals SLH and SRH output from the corresponding HPF 20 with a predetermined gain, respectively, and the tweeters 9 and 9 convert these amplified high-range musical tone signals SLH and SRH into acoustic signals, respectively. Converts into vibration and emits musical sounds into space. Similarly, amplifier 2
The woofers 10 and 10 amplify the low-tone musical signals SLL and SRL output from the corresponding LPF 21 with a predetermined gain, and the woofers 10 and 10 amplify the low-tone musical signals SLL and S.
The RL is converted into acoustic vibration, and a musical sound is emitted into space.

As shown in FIG. 3, the left and right speakers 8L,
8R is a speaker box 2
The tweeter 9 is disposed at the rear corner of the main body case 11 while the woofer 10 is disposed forward and closer to the center than the tweeter 9. I have. As a result, as shown in FIG.
The distances LA and LB from the centers of the woofer 10 and the tweeter 9 to the ears of the player P of the electronic keyboard 1 are not the same, and have a relationship of LB> LA as in the related art.

Next, the configuration and operation of the DSP 18 according to the present invention will be described in detail with reference to FIG. As shown in the figure, the DSP 18 includes a reverberation signal generation circuit 25.
And two delay circuits 26L and 26R for the left and right speakers 8L and 8R. In the DSP 18, first, the tone signal S serially output from the tone generator 17 is output.
Is time-divided by a time-division circuit (not shown) or the like, so that two tone signals S for the left and right speakers 8L and 8R are
L and SR are generated. Next, the tone signals SL and SR are each branched into two, and each of the branched signals is sent to a reverberation signal generation circuit 25 to generate a reverberation signal. Then, the generated reverberation signal and the tone signals SL and SR are branched. With each other
Adders 27 and 27 add the signals. As a result, a reverberation effect is added to each of the musical sound signals SL and SR, so that rich reproduced sound can be obtained.

Next, the tone signal S to which the reverberation effect is added
L and SR are each split into two again. Of these, one of the branches of the tone signal SL for the left speaker 8L is used as the tone signal SLH for the tweeter 9 by the DSP 1 as it is.
The sound is output from the tweeter 9 of the left speaker 8L through the D / A 19, the HPF 20, and the amplifier 22. On the other hand, the other branched tone signal SL is sent to the delay circuit 26L, where it is delayed by a predetermined delay value (delay time) D, and then output as the tone signal SLL for the woofer 10; / A19, LPF21
Woofer 1 of left speaker 8L
Sound is emitted from 0.

Similarly, the tone signal SR for the right speaker 8R
One of the branches is output as a tone signal SRH as it is, and is emitted from the tweeter 9 of the right speaker 8R, and the other is divided by the delay circuit 26R by the same delay value D as the delay circuit 26L. After being delayed, it is output as a tone signal SRL and is emitted from the woofer 10 of the left speaker 8L.

In this case, the delay value D (second (s)) of the delay circuits 26L and 26R is determined by the following equation (1) based on the positional relationship between the tweeter 9 and the woofer 10 and the player P. . D = (LB−LA) / C (1) where LA and LB are the distances (m) from the centers of the woofer 10 and the tweeter 9 to the ear of the player P, and C is , And is a sound speed (m / s) as a constant.

That is, each delay value D of the delay circuits 26L and 26R is determined as a value obtained by dividing the difference between the distance LB and the distance LA from the woofer 10 and the tweeter 9 to the player P's ear by the sound speed C. This value is the delay when the radiated musical sound from the tweeter 9 reaches the ear of the player P later than the radiated musical sound from the woofer 10 when the musical sound is emitted from the tweeter 9 and the woofer 10 simultaneously. Equal to time.

As described above, in the electronic keyboard 1 of the present embodiment, the tone signals SLL and SRL to the woofer 10 are provided.
Is delayed by the delay value D by the delay circuits 26L and 26R, so that after the emission of the musical tone from the tweeter 9, the output is delayed by a time corresponding to the delay value D,
A musical sound is emitted from the woofer 10.
As a result, the musical sound radiated from the tweeter 9 is transmitted to the player P
Can be reached without delay with the same phase as the musical sound radiated from the woofer 10 with a delay, so that the phase shift between the low range and the high range can be completely eliminated, and therefore, By maintaining a good balance of the reproduced sound, the sound quality can be improved.

FIGS. 4 and 5 show an electronic keyboard 31 according to a second embodiment of the present invention. As shown in FIG. 4, in the electronic keyboard 31, the tweeter 9 and the woofer 10 are arranged on the main body case 11 so that the distances to the player P are equal to each other. More specifically, the tweeter 9 and the woofer 10 of the right speaker 8R
Are arranged on an arc C having a radius LC centered on the right ear of the player P. Similarly, the tweeter 9 and the woofer 10 of the left speaker 8L are also arcs having the same radius LC centered on the left ear of the player P. It is arranged on C.

As shown in FIG. 5, the left and right tweeters 9 and the woofer 10 are connected to their diaphragms 32, 3
3, that is, arranged so that the vibration source portions are at the same height as each other. In addition, the difference between FIGS.
This is a difference in the shape of a cover (saran net) 34 that covers the tweeter 9 and the woofer 10. Further, the delay circuits 26L, 2L,
6R is omitted, tweeter 9 and woofer 10
To radiate musical sounds in phase. Other configurations are the same as in the first embodiment.

According to the configuration of the electronic keyboard 31, the distance from the tweeter 9 to the player P and the distance from the woofer 10 to the player P are equal to each other in each of the left and right speakers 8L and 8R. Tweeter 9
And the musical sound radiated in the same phase from the woofer 10 can reach the player P at the same time without a phase shift. Therefore, the phase shift between the low-frequency range and the high-frequency range is completely eliminated, and the balance of the reproduced sound can be kept good and the sound quality can be improved.

As described above, the electronic keyboard 31 of the second embodiment can achieve the intended purpose simply and inexpensively only by changing the arrangement of the tweeter 9 and the woofer 10.
Delay circuit 2 employed in electronic keyboard 1 of embodiment
There is an advantage that 6L, 26R and the like can be omitted.

The present invention is not limited to the embodiments described above, but can be implemented in various modes.
For example, the two embodiments are examples of a two-way speaker, but the present invention can be applied to a three-way speaker or a multi-way speaker of more. In this case, when the first embodiment is applied, the distance between one of a plurality of speakers farthest from the player and the player is used as a reference, and this distance and the distance from another speaker to the player. The delay value of the sound emission from the other speakers may be determined from the difference from the above.

In the first embodiment, the delay value is a fixed value. However, a delay circuit having a variable delay value may be used, and the delay value may be changed to an optimum value. Furthermore, both embodiments are examples of electronic keyboards, but it goes without saying that the present invention can be applied to other electronic keyboard instruments such as electronic pianos. In addition, the detailed configuration can be appropriately changed without departing from the spirit of the present invention.

[0037]

As described above, the electronic keyboard instrument of the present invention allows the musical tones radiated from a plurality of speakers to reach the performer without causing a phase shift between them, thereby producing a sound quality of reproduced sound. Can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an electronic keyboard according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a configuration of a DSP.

FIG. 3 is a schematic plan view showing the electronic keyboard of FIG. 1 together with a player.

FIG. 4 is a schematic plan view similar to FIG. 3, of an electronic keyboard according to a second embodiment of the present invention.

FIG. 5 is a diagram showing an arrangement of a tweeter and a woofer in the electronic keyboard of FIG. 4 as viewed from a side.

6 is a schematic plan view of a conventional electronic keyboard, similar to FIGS. 3 and 4. FIG.

[Explanation of symbols]

 Reference Signs List 1 electronic keyboard 2 keyboard 6 musical instrument signal generation circuit 9 tweeter 10 woofer 26L delay circuit 26R delay circuit 31 electronic keyboard C arc D delay value P player LA distance between woofer and player LB distance between tweeter and player

Claims (5)

[Claims] 1. A plurality of keyboards, tone signal generation means for generating and outputting a plurality of tone signals having a plurality of mutually different frequency bands in accordance with key depression information of the plurality of keys, and a tone signal generation means. A plurality of speakers that respectively reproduce a plurality of tone signals output from and emit a tone, a distance between a speaker and a player farthest from a player among the plurality of speakers, and the other speakers. A delay circuit for delaying the output of the tone signal from the tone signal generating means to the other speaker with a delay time corresponding to a difference from a distance from a player. Electronic keyboard instrument. 2. The delay time is determined as a value obtained by dividing a difference between a distance between a speaker and a player farthest from the player and a distance between the other speakers and the player by a sound speed. The electronic keyboard instrument according to claim 1, wherein: 3. An electronic keyboard instrument having a plurality of speakers for reproducing sounds in a plurality of frequency bands different from each other and emitting musical sounds, wherein the plurality of speakers are respectively composed of the plurality of speakers. An electronic keyboard instrument is arranged such that the distances to players who play are equal to each other. 4. The electronic keyboard according to claim 3, wherein the plurality of speakers are arranged on an arc centered on a player when the electronic keyboard instrument is viewed in a plan view. Musical instruments. 5. The electronic keyboard instrument according to claim 4, wherein the plurality of speakers are arranged at the same height.