JP3048206B2 - Sound equipment for electronic musical instruments - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic musical instrument having a stereo reproduction function.

[0002]

2. Description of the Related Art In recent years, electronic musical instruments such as electronic pianos, electronic organs, synthesizers, and the like play not only electronic musical tones unique to electronic musical instruments but also various musical instrument sounds (tones) such as pianos, trumpets, orchestras, and the like. You can do it.

FIG. 6 shows an external plan view of an example of such a conventional electronic musical instrument. In the figure, 13 is an operation panel, 14 is a keyboard device, and 26 and 27 are speakers. The musical sound generated by the electronic musical instrument reaches the player's ear via the speakers 26 and 27. Therefore, it is possible for a player to play a musical tone generated by playing the keyboard device 14 or a musical tone generated by an automatic performance while listening to the ear.

In recent years, most electronic musical instruments have a stereo reproduction function in order to meet a demand for improvement in musical tone quality. In order to realize such a stereo reproduction function, as shown in FIG. 6, two speakers 27 and 26 are arranged on the left and right of the back side of the electronic musical instrument when viewed from the player, and the left channel tone L and The musical tone R of the right channel is emitted.

[0005] Such a stereo reproduction function provides a sound image localization and a feeling of spaciousness. Therefore, for example, in the case of playing the electronic musical instrument with the tone of a piano while performing the automatic accompaniment with the orchestral tone, the orchestral tone that is automatically accompanied is also reproduced in stereo. By controlling the sound image localization, it is possible to enjoy playing as if playing the piano at a specific position on the stage with the orchestra in the background.

[0006]

However, when stereo reproduction is realized by two speakers as shown in FIG. 6, the tone L of the left channel emitted from the left speaker 27 is mainly the left tone of the player. It reaches the ear, but some also reach the right ear. Similarly, the musical tone R of the right channel emitted from the right speaker 26 mainly reaches the player's right ear, but partly reaches the left ear.

[0007] The presence of musical components reaching the left and right ears of the performer crossing each other makes the sound spread and sound image localization due to stereo reproduction unclear, thereby reducing the effect of stereo reproduction. There was a problem that they had been reduced. In order to solve such a problem, in a conventional electronic musical instrument, a measure is taken to increase the distance between the left and right speakers as much as possible.

That is, speakers are arranged at both ends of the main body case so that the sound emitted from each speaker reaches the performer's ear at an acute angle, the ratio of the musical tone R of the right channel reaching the left ear, and A measure is taken to reduce the rate at which the musical tone L of the left channel reaches the right ear.

However, since the length of the main body case of the electronic musical instrument is limited, only the above-described conventional measures can sufficiently reduce the ratio of the musical tone components reaching the left and right ears. However, there remains a problem that the sound spread and the sound image localization become unclear.

The present invention has been made in view of such circumstances, and in an electronic musical instrument having a stereo reproduction function, excellent sound image localization can be achieved by canceling musical sound components that reach the left and right ears of a player while crossing each other. And an audio device for an electronic musical instrument capable of obtaining a sense of spaciousness of a stereo.

[0011]

According to the first aspect of the present invention, there is provided a left speaker provided on the left side of the listener and a right speaker provided on the right side of the listener. In the acoustic device of an electronic musical instrument in which stereo reproduction is performed by being generated based on a left signal and a right signal, respectively, a first generation for generating the left difference signal by subtracting the right signal from the left signal Means and the first
Sounded based on the left difference signal generated by the generating means,
And a left difference speaker provided on the left side of the listener, second generation means for generating the right difference signal by subtracting the left signal from the right signal, and a right difference signal generated by the second generation means , And a right difference speaker provided on the right side of the listener.

According to a second aspect of the present invention, in order to achieve the same object as described above, the left difference speaker includes:
In order for the sound emitted from the left difference speaker to reach the left ear of the listener, the right difference speaker is directed in a predetermined direction so that the sound emitted from the right difference speaker reaches the right ear of the listener. It is characterized by being arranged with characteristics.

[0013]

According to the first aspect of the present invention, there is provided a left speaker provided on the left side of the listener and a right speaker provided on the right side of the listener, based on the left signal and the right signal, respectively. In an acoustic device of an electronic musical instrument in which stereo reproduction is performed by being pronounced, a left difference signal generated by subtracting the right signal from the left signal is sent to a left difference speaker provided on the left side of a listener. The sound is supplied and emitted, and the right difference signal generated by subtracting the left signal from the right signal is supplied to the left difference speaker provided on the right side for the listener so that the sound is emitted. I have.

Thus, a left tone component generated by the left speaker and directly reaching the left ear, a right tone component generated by the right speaker and reaching the cross, and a left difference speaker are generated at the listener's left ear. The tone components of the difference obtained by subtracting the right tone component from the left tone component arrive, respectively. As a result, the right tone component is canceled and only the left tone component reaches the left ear.

Similarly, to the right ear of the listener, a right tone component generated by the right speaker and directly arriving, a left tone component generated by the left speaker and arriving crosswise, and a right tone loudspeaker are generated. The tone components of the difference obtained by subtracting the left tone component from the right tone component arrive, respectively. As a result, the left tone component is canceled and only the right tone component reaches the right ear.

Therefore, only the left musical tone component and the right musical tone component reach the left and right ears of the listener, respectively, so that an excellent sound image localization and a sense of stereo spread can be obtained. .

In the invention according to claim 2, most of the tone components emitted from the left difference speaker reach the left ear of the listener, and most of the tone components emitted from the right difference speaker. To reach the listener's right ear
The left difference speaker and the right difference speaker are arranged with predetermined directional characteristics.

As a result, most of the tone components reaching the left ear are left tone components, and most of the tone components reaching the right ear are right tone components. Thus, excellent sound image localization and a sense of stereo spread are obtained. It is something that can be done.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of an embodiment of an electronic musical instrument to which an acoustic device according to the present invention is applied.

(1) First Embodiment A main part of the electronic musical instrument is a central processing unit (hereinafter referred to as a “CP”).
U) 10, a read-only memory (hereinafter referred to as "R").
OM ") 11, random access memory (hereinafter, referred to as" OM ").
"RAM") 12, operation panel 13, keyboard device 1
4, sound source 15 and digital signal processor (hereinafter, referred to as
18 (referred to as “DSP”).

The sound source 15 has a waveform memory 16 and R
AM17 is connected, and the DSP18 has a RAM.
19, D / A converters 20 and 21 are connected. Further, a right speaker 26 and a left speaker 27 are connected to the D / A converter 20 via amplifiers 22 and 23, respectively, and the D / A converter 21 is connected via amplifiers 24 and 25, respectively. The right difference speaker 28 and the left difference speaker 29 are connected.

The CPU 10 controls each section of the electronic musical instrument according to a control program stored in the ROM 11. For example, the CPU 10 controls the operation panel 1
3, a key number, initial touch data, and the like are fetched from the keyboard device 14, and timbre parameters are read out from the ROM 11 based on these data and sent to the sound source 15, thereby performing a process of generating a predetermined tone. .

As described above, the ROM 11 stores C
In addition to storing a control program for the PU 10, the CPU 10
, Various tone data for generating a musical tone of a predetermined tone color, and the like. A plurality of types of timbre parameters are provided corresponding to timbres and timbres, and each timbre parameter is composed of, for example, a waveform address, frequency data, envelope data, a filter coefficient, and the like.

The RAM 12 temporarily stores various data used by the CPU 10 for processing, and includes various registers, counters, and the like for controlling the electronic musical instrument.
Flags and the like are defined.

The operation panel 13 is, for example, shown in FIG.
As shown in the plan view of the external appearance of the present electronic musical instrument, the electronic musical instrument is arranged substantially at the center. The operation panel 13 is provided with, for example, a power switch, a volume, various other switches, a display, and the like.

The power switch is for turning on / off the power of the electronic musical instrument, and is composed of, for example, a push button switch. The volume controls the level of the volume, and is constituted by, for example, a slide volume. Other various switches include various switches for controlling the electronic musical instrument, for example, a tone color selection switch, a rhythm selection switch, a sound effect switch, and the like.

The timbre selection switch is used to select one timbre from a plurality of timbres prepared for the electronic musical instrument, and the rhythm selection switch is used to select one rhythm from a plurality of rhythms. The sound effect switch is used to specify the type of sound effect (for example, reverb).

The display includes, for example, an LCD display for displaying the status of the electronic musical instrument and various messages in characters and the like, an LED display for displaying the setting status of each switch, and the like. The display of these displays is controlled by the CPU 10.

The operation panel 13 configured as described above
Are connected to the CPU 10 via a panel scan circuit (not shown).
It is connected to the. The panel scan circuit sends a scan signal to the operation panel 13, receives a signal indicating the on / off state of each switch returned from the operation panel 13 in response to the scan signal, and
Send to The CPU 10 performs processing corresponding to each switch operation with reference to the signal indicating the ON / OFF state of each switch.

The panel scan circuit is provided by the CPU 10
Is sent to the operation panel 13. Thereby, the display content of the LCD display provided on the operation panel 13 is changed, or the LED display is turned on or off.

The keyboard device 14 has a plurality of keys for indicating a pitch. This keyboard device 14
For example, a two-contact keyboard device is used, and it is possible to detect initial touch data as well as turning on / off a key. That is, the keyboard device 14
Are turned on / off by a key press or key release operation.
It has a plurality of key switches, and is turned on / off at different pressing depths.

The keyboard device 14 is connected to the CPU 10 via a keyboard scan circuit (not shown). The keyboard scan circuit sends a scan signal to the keyboard device 14 and receives data indicating the on / off state of the two key switches returned from the keyboard device 14 in response to the scan signal.

The keyboard scanning circuit includes the keyboard device 1
From the data indicating the on / off state of the two key switches received from 4, data indicating on / off of each key and initial touch data are generated and sent to the CPU 10.
The CPU 10 extracts the tone color parameters from the ROM 11 according to the received data indicating the ON / OFF state of each key and the initial touch data and the tone color number selected at that time, and sends them to the sound source 15. As a result, sound generation / muting is performed.

The sound source 15 includes, for example, a plurality of oscillators. This sound source 15 has a waveform memory 1
6 and the RAM 17 are connected. Waveform memory 16
Is composed of, for example, a ROM, and stores, for example, musical tone waveform data subjected to pulse code modulation (PCM). The waveform memory 16 stores a plurality of types of musical sound waveform data separately for the left channel and for the right channel for each tone in order to reproduce a plurality of types of timbres in stereo.

The RAM 17 temporarily stores data used by the sound source 15 to generate digital tone signals, for example, the read address of the waveform memory 16, the target value of the envelope, the speed data, and the like. Sound source 15
Are used as work registers.

Based on the tone color parameters and the tone generation start command received from the CPU 10, the sound source 15
Is used as a work register, the tone waveform data stored in the waveform memory 16 is read out, an envelope is added thereto, and a digital tone signal Ld for the left channel (corresponding to the left signal) and a digital tone for the right channel are read. A signal Rd (corresponding to the right signal) is generated. Since the method of creating these digital musical tone signals Ld and Rd is well known, detailed description will be omitted.

The sound source 15 stops reading the tone waveform data from the waveform memory 16 based on the tone generation end command received from the CPU 10, and outputs the digital tone signal Ld,
Stop generation of Rd. The digital tone signals Ld and Rd generated by the sound source 15 are sent to the DSP 18.

The DSP 18 receives the digital tone signal Ld for the left channel and the digital tone signal Rd for the right channel output by the sound source 15 and outputs them as they are, while performing predetermined processing on them and performing the present invention. Left difference signal (LR) d and right difference signal (RL) which are features
d is generated and output.

The DSP 18 includes, for example, a processor, and the processing of the processor generates the left differential signal (LR) d and the right differential signal (RL) d. A RAM 19 is connected to the DSP 18. The RAM 19 is used as a work register when the processor of the DSP 18 performs various processes.

The DSP 18 can be constituted by hardware without a processor. FIG. 2 shown below shows the DSP 18 configured by hardware for easy understanding.

In FIG. 2, 30 to 33 are multipliers, 34
And 35 are adders, and 36 and 37 are delay circuits. In the case of the DSP 18 having a processor, the functions of the multipliers 30 to 33, the adders 34 and 35, and the delay circuits 36 and 37 are realized by software processing.

The digital tone signal Rd for the right channel inputted from the sound source 15 is outputted as it is and sent to the D / A converter 20 and also sent to the multipliers 30 and 32. The digital tone signal Ld for the left channel input from the sound source 15 is output as it is and sent to the D / A converter 20 and also sent to the multipliers 31 and 33.

The multiplier 30 corresponds to a part of the second generating means, and multiplies the digital tone signal Rd for the right channel supplied from the sound source 15 by a multiplication coefficient “+ α”. The multiplication coefficient “+ α” is given from the CPU 10 and is used to determine the sign and magnitude of the multiplication result. In the following, α is assumed to be “1” for simplicity of description. This multiplier 30
The signal “+ Rd” resulting from the multiplication is supplied to the adder 34.

The multiplier 31 corresponds to a part of the second generation means, and multiplies the digital tone signal Ld for the left channel supplied from the sound source 15 by the multiplication coefficient "-β". . The multiplication coefficient “−β” is given from the CPU 10 and is used to determine the sign and magnitude of the multiplication result. In the following, β is assumed to be “1” for simplicity of description. This multiplier 31
Is supplied to the adder 34.

The adder 34 corresponds to a part of the second generating means, and includes a signal "+ Rd" supplied from the multiplier 30 and a signal "-Rd" supplied from the multiplier 31.
Ld ". The signal (RL) m resulting from the addition by the adder 34 is a difference signal (hereinafter, referred to as a "right difference signal") obtained by subtracting the digital tone signal Ld for the left channel from the digital tone signal Rd for the right channel. Is shown. The right difference signal (RL) m is sent to the delay circuit 36.

The delay circuit 36 corresponds to a part of the second generating means, and delays the right difference signal (RL) m supplied from the adder 34 by a predetermined time and outputs it. . The right differential signal (R−
L) d is sent to the D / A converter 21.

The delay circuit 36 determines the distance from the left speaker 27 to the player's right ear and the right differential signal (RL) m.
To correct the phase shift of the left musical tone component L based on the difference from the distance from the right difference speaker 28 for reproducing to the right ear of the player. The delay time of the delay circuit 36 is
It is determined based on the distance difference.

By the operation of the delay circuit 36, the left tone component "L" reaching the right ear from the left speaker 27 and the left tone component "-" reaching the right ear from the right difference speaker 28.
L "is canceled, and only the right musical tone component can be heard in the right ear.

Depending on the positional relationship between the left speaker 27 and the right difference speaker 28, the distance from the left speaker 27 to the performer's right ear and the right difference signal (RL) m are determined. In some cases, the difference between the right difference speaker 28 to be reproduced and the distance from the player's right ear may be small. In such a case, the delay circuit 36 may be omitted in practical use.

The multiplier 32 corresponds to a part of the first generating means, and multiplies the digital tone signal Rd for the right channel supplied from the sound source 15 by the multiplication coefficient "-γ". . The multiplication coefficient “−γ” is given from the CPU 10 and is used to determine the sign and magnitude of the multiplication result. In the following, it is assumed that γ is “1” for simplicity of description. This multiplier 32
The signal “−Rd” resulting from the multiplication is supplied to the adder 35.

The multiplier 33 corresponds to a part of the first generating means, and multiplies the digital tone signal Ld for the left channel supplied from the sound source 15 by a multiplication coefficient “+ δ”. The multiplication coefficient “+ δ” is given from the CPU 10 and is used to determine the sign and magnitude of the multiplication result. In the following, it is assumed that δ is “1” for simplicity of description. This multiplier 33
Is supplied to the adder 35.

The adder 35 corresponds to a part of the first generating means, and includes a signal "-Rd" supplied from the multiplier 32 and a signal "+" supplied from the multiplier 33.
Ld ". The signal (LR) m resulting from the addition by the adder 35 is a difference signal (hereinafter, referred to as a "left difference signal") obtained by subtracting the digital tone signal Rd for the right channel from the digital tone signal Ld for the left channel. Is shown. The left difference signal (LR) m is sent to the delay circuit 37.

The delay circuit 37 corresponds to a part of the first generation means, and outputs the left difference signal (LR) m supplied from the adder 35 with a delay of a predetermined time. . The left difference signal (L−
R) d is sent to the D / A converter 21.

The delay circuit 37 calculates the distance from the right speaker 26 to the left ear of the player and the left differential signal (LR) m.
To correct the phase shift of the right musical tone component R based on the difference from the distance from the left difference speaker 29 for reproducing to the left ear of the player. The delay time in the delay circuit 37 is
It is determined based on the distance difference.

By the operation of the delay circuit 37, the right tone component "R" reaching the left ear from the right speaker 26 and the right tone component "-" reaching the left ear from the left difference speaker 29.
R "is canceled, and only the left musical tone component can be heard in the left ear.

Depending on the positional relationship between the right speaker 26 and the left difference speaker 29, the distance from the right speaker 26 to the player's left ear and the left difference signal (LR) In some cases, the difference between the left difference speaker 29 for reproducing m and the distance from the left ear of the player may be small. In such a case, the delay circuit 37 may be omitted in practical use.

The D / A converter 20 converts the digital tone signal Ld for the left channel and the digital tone signal Rd for the right channel output by the DSP 18 into an analog tone signal La for the left channel and an analog tone signal for the right channel, respectively. This is converted into a tone signal Ra. This D /
The analog tone signal Ra for the right channel converted by the A converter 20 is sent to the amplifier 22, and the analog tone signal La for the left channel is sent to the amplifier 23.

The amplifier 22 amplifies the analog tone signal Ra for the right channel at a predetermined amplification factor. The analog tone signal Ra amplified by the amplifier 22 is sent to the right speaker 26. The amplifier 23 amplifies the left channel analog tone signal La at a predetermined gain. The analog tone signal La amplified by the amplifier 23 is sent to the left speaker 27.

The D / A converter 21 converts the right difference signal (RL) d and the left difference signal (LR) d as digital signals output from the DSP 18 into right difference signals (LR) as analog signals, respectively. RL) a and the left difference signal (L-
R) a. The right difference signal (RL) a converted by the D / A converter 21 is sent to the amplifier 24, and the left difference signal (LR) a is sent to the amplifier 25.

The amplifier 24 amplifies the right difference signal (RL) a at a predetermined amplification factor. The right difference signal (RL) a amplified by the amplifier 22 is sent to the right difference speaker 28. The amplifier 24 amplifies the left differential signal (LR) a at a predetermined amplification factor. The left differential signal (LR) a amplified by the amplifier 23 is
It is sent to the left difference speaker 29.

The loudspeakers 26 to 29 are well known to convert an input electric signal into an acoustic signal. A predetermined musical sound is emitted by each of the speakers 26 to 29.

Next, the arrangement of the speakers 26 to 29 in the electronic musical instrument will be described.

FIG. 3 shows a first embodiment of the arrangement of the speakers 26 to 29, wherein FIG. 3A is a plan view and FIG. 3B is a side view.

In FIG. 3, the right speaker 26 is located at the far right side of the main body case as viewed from the player. From the right speaker 26, a tone component R based on the analog tone signal Ra for the right channel is emitted. The tone generated by the right speaker 26 mainly reaches the right ear of the performer as a listener, but a part of the tone also reaches the left ear.

The left speaker 27 is disposed at the far left side of the main body case as viewed from the player. From the left speaker 27, a tone component L based on the analog tone signal La for the left channel is emitted. The musical sound generated by the left speaker 27 mainly reaches the left ear of the player, but a part of the musical sound also reaches the right ear.

Conventionally, since only the right speaker 26 and the left speaker 27 are provided, the right ear of the performer receives not only the tone component R but also the tone component "R + L" containing the tone component L. I heard a musical sound based on it. Further, the left ear could hear a tone based on the tone component “L + R” including the tone component R as well as the tone component L. As a result, the localization of the sound image becomes unclear, and the sense of expanse of the stereo is also deteriorated.

The present invention has been made in order to eliminate the above disadvantages.
In addition to the right speaker 26 and the left speaker 27, a right difference speaker 28 and a left difference speaker 29 for removing extra tone components for the right ear or the left ear, respectively.
Is added.

That is, the right difference speaker 28 is arranged such that its opening is directed upward in the figure, on the right side in the figure of the main body case, for example, in the figure on the right side of the keyboard device 14, as viewed from the player. I have. From the right difference speaker 28, a tone component "RL" based on the right difference signal (RL) a is emitted. The tone generated by the right difference speaker 28 is
Since the player reaches an acute angle at the right ear of the player, it hardly reaches the left ear.

The left difference speaker 29 is located at the left end side of the main body case in FIG.
The opening is arranged on the left end side in the drawing with the opening facing upward in the drawing. From the left difference speaker 29, a tone component "LR" based on the left difference signal (LR) a is emitted. Since the musical tone generated by the left difference speaker 29 reaches the performer's left ear at an acute angle, it hardly reaches the right ear.

With this arrangement, the tone component R, the tone component L and the tone component "RL" arrive at the right ear of the player, so that the component "L" and the component "-L" cancel each other. As a result, the component “2R” is heard by the right ear. This means that the same effect as when only the right component reaches the right ear is achieved.

Since the tone component R, the tone component L, and the tone component "LR" arrive at the left ear of the player, the component "R" and the component "-R" are canceled out, Ingredient "2
L "will be heard by the left ear. This means that the same effect as when only the left component reaches the left ear is achieved.

Accordingly, the components reaching the performer's both ears crossing from the opposite speakers are canceled out, only the right tone component R is heard in the right ear, and the left tone component is seen in the left ear. L
Only the sound can be heard, so that in the stereo reproduction, an excellent sound image localization and a sense of stereo spread can be obtained.

FIG. 4 shows a second embodiment of the arrangement of the speakers 26 to 29. FIG. 4A is a plan view and FIG. 4B is a side view. In FIG. 4, the arrangement positions of the right speaker 26 and the left speaker 27 are the same as those in the first embodiment.

In the second embodiment, the right difference speaker 28 has an opening at the right side of the main body case as viewed from the player, for example, at the back side of the keyboard device 14 in the figure. It is arranged toward the right front side. From the right difference speaker 28, a tone component "RL" based on the right difference signal (RL) a is emitted. This right difference speaker 28
Many of the musical tones generated in the above reach the right ear of the player depending on the direction of the opening, but hardly reach the left ear.

The left difference speaker 29 is located on the left side of the main body case in FIG.
4, the opening is arranged with the opening facing the left front side in the figure. From the left difference speaker 29, a tone component "LR" based on the left difference signal (LR) a is emitted. Most of the musical sounds generated by the left difference speaker 29 reach the left ear of the performer depending on the direction of the opening, but hardly reach the right ear.

With this arrangement, as in the case of the first embodiment, the components reaching the both ears of the performer crossing from the opposite speakers are canceled, and the right musical tone component R is added to the right ear. Only the left ear can hear only the left musical tone component L, so that in stereo reproduction, excellent sound image localization and a sense of stereo spread can be obtained.

FIG. 5 shows a third embodiment of the arrangement of the speakers 26 to 29, and FIG. 5 is a plan view. In FIG. 5, the arrangement positions of the right speaker 26 and the left speaker 27 are the same as those in the first embodiment.

In the third embodiment, a portable speaker is adopted as the right difference speaker 28. The right difference speaker 28 is disposed on the right side of the player in the figure, with the opening facing the left side of the figure, that is, with the opening facing the player's right ear. From the right difference speaker 28, a right difference signal (R
-L) A tone component "RL" based on a is emitted.
The tone generated by the right difference speaker 28 reaches the player's right ear almost at right angles, and hardly reaches the left ear.

A portable speaker is also used as the left difference speaker 29. This right difference speaker 29
Is arranged on the left side of the player in the figure, with the opening facing the right side of the figure, that is, with the opening facing the left ear of the player. From the left difference speaker 29, a tone component "LR" based on the left difference signal (LR) a is emitted. The musical tone generated by the left difference speaker 29 reaches the left ear of the player almost at right angles, and hardly reaches the right ear.

With this arrangement, as in the case of the first embodiment, the components reaching the both ears of the performer crossing from the opposite speakers are canceled, and the right musical tone component R is applied to the right ear. Only the left ear can hear only the left musical tone component L, so that in stereo reproduction, excellent sound image localization and a sense of stereo spread can be obtained.

In the first to third embodiments, the distance from the left speaker 27 to the player's right ear, and the player from the right difference speaker 28 for reproducing the right difference signal (RL) m. , The phase shift of the left musical tone component L based on the difference from the distance to the right ear, the distance from the right speaker 26 to the player's left ear, and the left differential signal (LR) for reproducing the left differential signal (LR) m. The phase shift of the right musical tone component R based on the difference from the distance from the speaker 29 to the left ear of the player is determined by delay circuits 36 and 3 respectively.
7 can be corrected as described above.

As described above, according to the above embodiments, the left speaker 2 provided on the left side with respect to the player
7 and a right speaker 26 provided on the right side of the electronic musical instrument to perform stereo reproduction by being produced based on the analog tone signal La for the left channel and the analog tone signal Ra for the right channel, respectively. In the audio device, the analog musical tone signal La for the left channel
The left difference signal (LR) a generated by subtracting the analog tone signal Ra for the right channel from the left channel is supplied to a left difference speaker 29 provided on the left side for the listener to output sound. The right difference signal (RL) a generated by subtracting the left channel analog tone signal La from the right channel analog tone signal Ra is supplied to a left difference speaker 28 provided on the right side of the listener. To make it sound.

Thus, to the left ear of the performer, the tone component L generated by the left speaker 27 and directly reaching, the tone component R generated by the right speaker and reaching by crossing, and the right tone component from the left tone component. The tone component "L-
R "reach each other, and as a result, the right musical tone component R is canceled and only the left musical tone component L reaches the left ear.

Similarly, to the performer's right ear, a tone component R generated by the right speaker 26 and directly reaching, a tone component L generated by the left speaker 27 and reaching by crossing, and a right tone component are used. Tone component "R-
L "respectively arrive, and as a result, the left musical tone component L is canceled, and only the right musical tone component R reaches the right ear.

Therefore, only the left musical tone component L and the right musical tone component R reach the left and right ears of the player, respectively. The sound image localization and the sense of spaciousness of the stereo can be obtained, and the sound image front localization as experienced when listening to music through speaker reproduction can be obtained.

Each of the above embodiments has a large effect on, for example, automatic performance data as a sound source recorded in stereo, and has the greatest effect on a sound source recorded using a dummy head. It is needless to say that a predetermined effect is also exerted on the sound source reproduced in the pseudo stereo system.

In each of the above embodiments, the case where the listener is a performer has been described. However, the present invention can be similarly applied to a case where the listener is opposed to an electronic musical instrument such as a spectator at a performance hall. is there. In this case, it can be realized by arranging the directions of the stereos 26 to 29 by rotating them by 180 degrees.

[0088]

As described in detail above, according to the present invention,
In an electronic musical instrument having a stereo reproduction function, a sound device for an electronic musical instrument that can obtain excellent sound image localization and a sense of stereo spread by canceling out musical components reaching the performer's left and right ears crossing each other. Can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of an electronic musical instrument to which an acoustic device of the present invention is applied.

FIG. 2 is a circuit diagram illustrating a configuration of a DSP according to an embodiment of the present invention.

FIG. 3 is a diagram showing a first embodiment of a speaker arrangement according to the embodiment of the present invention.

FIG. 4 is a diagram showing a second embodiment of the speaker arrangement according to the embodiment of the present invention.

FIG. 5 is a diagram showing a third embodiment of the speaker arrangement according to the embodiment of the present invention.

FIG. 6 is an external plan view for explaining a conventional electronic musical instrument having a stereo reproduction function.

[Explanation of symbols]

 Reference Signs List 10 CPU 11 ROM 12 RAM 13 Operation panel 14 Keyboard device 15 Sound source 16 Waveform memory 17 RAM 18 DSP 19 RAM 20, 21 D / A converter 22-25 Amplifier 26-29 Speaker

Claims (1)

(57) [Claims] 1. A left speaker provided on the left side of a listener.
Speaker and the right speaker provided to the right of the listener.
And is pronounced based on the left and right signals respectively
Device for electronic musical instruments with stereo reproduction
Generating a left differential signal by subtracting the right signal from the left signal.
First generating means, and generating a sound based on the left difference signal generated by the first generating means.
And the left difference speaker provided on the left side to the listener.
And subtracting the left signal from the right signal to generate a right differential signal.
A second generation unit that generates a sound based on the right difference signal generated by the second generation unit.
And the right difference speaker provided on the right side to the listener.
,With The left difference speaker emits from the left difference speaker.
In order for the sound to reach the left ear of the listener,
The speaker emits the sound from the right difference speaker.
Each with a certain directional characteristic to reach the right ear of
Arranged An acoustic device for an electronic musical instrument.