JPH06289859

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DESCRIPTION JPH06289859
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio apparatus for an electronic musical instrument having a stereo reproduction function.
[0002]
2. Description of the Related Art Electronic musical instruments such as electronic pianos,
electronic organs or synthesizers in recent years are played not only by the timbre of electronic
sounds unique to electronic musical instruments, but also by various musical instrument sounds
(tones) such as piano, trumpet or orchestra. It can be done.
[0003]
An external plan view of an example of such a conventional electronic musical instrument is
shown in FIG.
In the figure, 13 is an operation panel, 14 is a keyboard device, and 26 and 27 are speakers. The
musical tones generated by the electronic musical instrument reach the player's ear through the
speakers 26 and 27. Therefore, the performer can play while playing the musical tone generated
by playing the keyboard device 14 or the musical tone generated by the automatic performance
with his ear.
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[0004]
By the way, most electronic musical instruments in recent years have a stereo reproduction
function in order to meet the demand for improvement in the quality of musical tones. In order to
realize such a stereo reproduction function, as shown in FIG. 6, two speakers 27 and 26 are
disposed on the left and right of the back of the electronic musical instrument as seen by the
performer, and the respective musical tones L and L of the left channel The right channel tone R
is to be emitted.
[0005]
With this stereo reproduction function, sound image localization and a feeling of spread can be
obtained. Therefore, for example, when playing an electronic musical instrument with the tone of
a piano while performing automatic accompaniment with the tone of an orchestra, for example,
the orchestral sound to be automatically accompanied is also reproduced in stereo. By controlling
the sound image localization, it is possible to enjoy the performance as if playing the piano at a
specific position on the stage with the orchestra back.
[0006]
However, in the case where stereo reproduction is realized by two speakers as shown in FIG. 6,
the musical tone L of the left channel emitted from the left speaker 27 is mainly left of the
performer's left Reaches the ear but some reach the right ear. Similarly, the right channel tone R
emitted from the right speaker 26 mainly reaches the right ear of the player, but partially
reaches the left ear.
[0007]
The presence of tone components that cross each other and reach the left and right ears of the
performer obscures the sense of sound expansion and sound image localization due to stereo
reproduction, and the effect of stereo reproduction is diminished. There was a problem of In
order to solve this problem, in the conventional electronic musical instrument, a procedure is
taken to make the distance between the left and right speakers as large as possible.
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[0008]
That is, speakers are disposed at both ends of the main body case so that sounds emitted from
the speakers reach the ears of the performer at an acute angle, and a rate at which the musical
tone R in the right channel reaches the left ear, and Measures are taken to reduce the rate at
which the musical tone L reaches the right ear.
[0009]
However, since the length of the main body case of the electronic musical instrument is limited, it
is sufficient to reduce the ratio of the musical tone components reaching the left ear and the right
ear, respectively, sufficiently by the above-mentioned conventional measures alone. There was a
problem that it was impossible to do so, and the sense of the sound spread and the sound
localization became unclear.
[0010]
The present invention has been made in view of the above circumstances, and in an electronic
musical instrument having a stereo reproduction function, superior sound image localization and
stereo by canceling out the musical tone components which cross and reach the left and right
ears of the performer. An object of the present invention is to provide an audio device of an
electronic musical instrument capable of obtaining a sense of spread.
[0011]
In order to achieve the above object, according to the first aspect of the present invention, there
is provided a left speaker provided on the left side with respect to the listener and a right speaker
provided on the right side with respect to the listener. And an audio device of an electronic
musical instrument in which stereo reproduction is performed by producing sounds based on the
left signal and the right signal, respectively; first generating a left difference signal by subtracting
the right signal from the left signal Means, a left difference speaker produced on the basis of the
left difference signal generated by the first generation means and provided on the left with
respect to the listener, and the right difference signal by subtracting the left signal from the right
signal And a right difference speaker provided on the right side with respect to the listener and
sounded based on the right difference signal generated by the second generation means. Do.
[0012]
Also, in order to achieve the same object as described above, according to the second aspect of
the present invention, in the left differential speaker, the sound emitted from the left differential
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speaker reaches the listener's left ear. The right difference speaker is characterized in that each
of the right difference speakers is provided with a predetermined directional characteristic so
that the sound emitted from the right difference speaker reaches the listener's right ear.
[0013]
According to the first aspect of the present invention, the left speaker provided on the left side
with respect to the listener and the right speaker provided on the right side with respect to the
listener have the left signal and the right signal, respectively. In an audio device of an electronic
musical instrument in which stereo reproduction is performed by generating sound, a left
difference signal generated by subtracting the right signal from the left signal is used as a left
difference speaker provided on the left side with respect to a listener. 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 to emit sound. There is.
[0014]
As a result, the left musical tone component generated and reached directly by the left speaker,
the right musical tone component generated by the right loudspeaker and reaching the cross,
and the left musical tone generated by the left differential speaker are provided to the listener's
left ear. The difference between the components obtained by subtracting the right musical tone
component arrives, and as a result, the right musical tone component is offset and only the left
musical tone component reaches the left ear.
[0015]
Similarly, to the right ear of the listener, the right musical tone component generated and
reached directly by the right speaker, the left musical tone component generated by the left
speaker and reached crosswise, and the right musical tone generated by the right differential
speaker The difference between the components obtained by subtracting the left musical tone
component arrives, and as a result, the left musical tone component is offset and only the right
musical tone component reaches the right ear.
[0016]
Therefore, only the left musical tone component and the right musical tone component reach the
left ear and the right ear of the listener, respectively, and it is possible to obtain excellent sound
image localization and a wide sense of stereo.
[0017]
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In the second aspect of the present invention, most of the musical tone components emitted from
the left differential speaker reach the left ear of the listener, and most of the musical tone
components emitted from the right differential speaker are the listener's In order to reach the
right ear, the left differential speaker and the right differential speaker are disposed with
predetermined directivity characteristics.
[0018]
As a result, most of the musical tone components reaching the left ear become the left musical
tone components and most of the musical tone components reaching the right ear become the
right musical tone components, so that excellent sound image localization and stereo widening
can be obtained. It has become a thing.
[0019]
Embodiments of the present invention will be described in detail below 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 audio device according to the present invention is applied.
[0020]
(1) First Embodiment The main part of the present electronic musical instrument comprises a
central processing unit (hereinafter referred to as "CPU") 10, a read only memory (hereinafter
referred to as "ROM") 11 and a random access memory (hereinafter referred to as " 12), an
operation panel 13, a keyboard device 14, a sound source 15, and a digital signal processor
(hereinafter referred to as "DSP") 18 are connected.
[0021]
A waveform memory 16 and a RAM 17 are connected to the sound source 15, and a RAM 19 and
D / A converters 20 and 21 are connected to the DSP 18.
Furthermore, the right speaker 26 and the left speaker 27 are connected to the D / A converter
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20 through the amplifiers 22 and 23, respectively, and the D / A converter 21 is connected to the
D / A converter 20 through the amplifiers 24 and 25, respectively. The right difference speaker
28 and the left difference speaker 29 are connected.
[0022]
The CPU 10 controls each part of the electronic musical instrument in accordance with a control
program stored in the ROM 11.
For example, the CPU 10 takes in the timbre number from the operation panel 13, takes in the
key number, initial touch data, etc. from the keyboard device 14, reads the timbre parameter
from the ROM 11 based on these data, and sends it to the tone generator 15. Processing etc. to
generate
[0023]
As described above, the ROM 11 stores the control program of the CPU 10, as well as various
fixed data used by the CPU 10, tone color parameters for generating tones of a predetermined
tone, and the like.
A plurality of types of timbre parameters are provided corresponding to timbres and ranges, and
each timbre parameter includes, for example, a waveform address, frequency data, envelope data,
filter coefficient, and the like.
[0024]
The RAM 12 temporarily stores various data used for processing by the CPU 10, and various
registers, counters, flags and the like for controlling the electronic musical instrument are
defined.
[0025]
The operation panel 13 is disposed substantially at the center of the electronic musical
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instrument, as shown in the external plan view of the electronic musical instrument of FIG. 3A,
for example.
The operation panel 13 is provided with, for example, a power switch, a volume, various other
switches, a display, and the like.
[0026]
The power switch is for turning on / off the power of the electronic musical instrument, and is
constituted of, for example, a push button switch.
The volume is used to control the magnitude of the volume, and is, for example, a slide-type
volume.
The other various switches include various switches for controlling the present electronic
musical instrument, such as a timbre selection switch, a rhythm selection switch, a sound effect
switch, and the like.
[0027]
The tone selection switch is used to select one tone from the multiple tones prepared in this
electronic musical instrument, and the rhythm selection switch is similarly used to select one
rhythm from the multiple rhythms. The sound effect switch is used to specify the type of sound
effect (e.g. reverb).
[0028]
The display includes, for example, an LCD display that displays the state of the electronic musical
instrument and various messages by characters and the like, and an LED display that displays the
set state of each switch.
The display control of these displays is performed by the CPU 10.
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[0029]
The operation panel 13 configured as described above is connected to the CPU 10 via a panel
scan circuit (not shown).
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 sends it to the CPU 10.
The CPU 10 performs processing corresponding to each switch operation with reference to the
signal indicating the on / off state of each switch.
[0030]
Also, the panel scan circuit sends the display data sent from the CPU 10 to the operation panel
13.
Thereby, the change of the display content of the LCD display provided in the operation panel 13
or the like, or the lighting or extinguishing of the LED display is performed.
[0031]
The keyboard device 14 is configured to have a plurality of keys for instructing pitches.
For example, a two-contact keyboard device is used as the keyboard device 14 so that initial
touch data can be detected along with on / off of the key.
That is, each key of the keyboard device 14 has two key switches that are turned on / off by key
depression or key release operation, and is turned on / off with different pressing depths.
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[0032]
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 unit 14 and receives data
indicating the on / off state of the two key switches returned from the keyboard unit 14 in
response to the scan signal.
[0033]
The keyboard scan circuit generates data indicating on / off of each key and initial touch data
from the data indicating the on / off state of the two key switches received from the keyboard
device 14 and sends the data to the CPU 10. The CPU 10 takes out the tone color parameter
from the ROM 11 in accordance with the received data indicating the on / off state of each key,
the initial touch data, and the tone color number selected at that time, and sends this to the tone
generator 15. As a result, sound production / mute will be performed.
[0034]
The sound source 15 is configured to include, for example, a plurality of oscillators. A waveform
memory 16 and a RAM 17 are connected to the sound source 15. The waveform memory 16 is
configured by, for example, a ROM, and stores, for example, tone waveform data that has been
pulse code modulated (PCM). In this waveform memory 16, in order to reproduce plural kinds of
timbres in stereo, plural kinds of musical tone waveform data are stored separately for left
channel and right channel for each timbre.
[0035]
The RAM 17 temporarily stores data used by the tone generator 15 to generate a digital musical
tone signal, for example, the read address of the waveform memory 16, the target value of the
envelope, speed data, etc. It is used as a work register.
[0036]
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The tone generator 15 reads the tone waveform data stored in the waveform memory 16 based
on the tone color parameter and the tone generation start command received from the CPU 10,
using the RAM 17 as a working register, adds an envelope to this, and adds it to the left channel.
Digital tone signal Ld (corresponding to the left signal) and digital tone signal Rd for the right
channel (corresponding to the right signal).
The method of producing these digital musical tone signals Ld and Rd is well known, and
therefore the detailed description is omitted.
[0037]
The sound source 15 also stops reading out of the tone waveform data from the waveform
memory 16 based on the tone generation end command received from the CPU 10, and stops the
generation of the digital tone signals Ld and Rd. The digital musical tone signals Ld and Rd
generated by the tone generator 15 are sent to the DSP 18.
[0038]
The DSP 18 receives the digital musical tone signal Ld for the left channel and the digital musical
tone signal Rd for the right channel output from the sound source 15 and outputs them as they
are, while performing predetermined processing on these to characterize the present invention.
The left differential signal (LR) d and the right differential signal (RL) d are generated and output.
[0039]
The DSP 18 is configured to have, for example, a processor, and the left differential signal (LR) d
and the right differential signal (RL) d are generated by the processing of the processor.
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.
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[0040]
The DSP 18 can also be configured by hardware without a processor. In FIG. 2 shown below, the
DSP 18 configured by hardware is shown to facilitate understanding.
[0041]
In FIG. 2, reference numerals 30 to 33 denote multipliers, 34 and 35 adders, and 36 and 37
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.
[0042]
The digital musical 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.
Further, the digital musical tone signal Ld for the left 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 31 and 33.
[0043]
The multiplier 30 corresponds to a part of the second generation means, and multiplies the
digital musical tone signal Rd for the right channel supplied from the sound source 15 by the
multiplication coefficient + α . The multiplication coefficient + α is given from the CPU
10 and is used to determine the sign and the magnitude of the multiplication result. Here, in
order to simplify the explanation, it is assumed that α is 1 . The resulting signal + Rd
multiplied by the multiplier 30 is supplied to the adder.
[0044]
The multiplier 31 corresponds to a part of the second generation means, and multiplies the
digital musical tone signal Ld for the left channel supplied from the sound source 15 by the
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multiplication coefficient −β . The multiplication coefficient "-.beta." Is given by the CPU 10
and is used to determine the sign and the magnitude of the multiplication result. In the following,
β is 1 in order to simplify the description. The signal −Ld resulting from the
multiplication by the multiplier 31 is supplied to the adder.
[0045]
The adder 34 corresponds to a part of the second generation means, and adds the signal "+ Rd"
supplied from the multiplier 30 and the signal "-Ld" supplied from the multiplier 31. It is a thing.
A signal (R-L) m of the addition result by the adder 34 is a difference signal (hereinafter referred
to as "right difference signal") obtained by subtracting the left channel digital tone signal Ld from
the right channel digital tone signal Rd. It shows. The right differential signal (R-L) m is sent to
the delay circuit 36.
[0046]
The delay circuit 36 corresponds to a part of the second generation means, and delays the right
difference signal (R-L) m supplied from the adder 34 by a predetermined time and outputs it. The
right difference signal (R−L) d output from the delay circuit 36 is sent to the D / A converter 21.
[0047]
The delay circuit 36 is a difference between the distance from the left speaker 27 to the right ear
of the performer and the distance from the right difference speaker 28 for reproducing the right
difference signal (R−L) m to the right ear of the performer. The phase shift of the left musical
tone component L is corrected based on the above. The delay time in the delay circuit 36 is
determined based on the distance difference.
[0048]
By the action of the delay circuit 36, the left musical tone component "L" arriving from the left
speaker 27 to the right ear and the left musical tone component "-L" arriving from the right
difference speaker 28 to the right ear are canceled out. Then only the right tone component will
be heard.
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[0049]
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 right ear of the performer and the right
to reproduce the right difference signal (R−L) m The difference between the difference speaker
28 and the distance from the right ear of the player may be small. In such a case, the delay
circuit 36 may be omitted in practice without any problem.
[0050]
The multiplier 32 corresponds to a part of the first generation means, and multiplies the digital
musical tone signal Rd for the right channel supplied from the sound source 15 by the
multiplication coefficient −γ .
The multiplication coefficient "-.gamma." Is given by the CPU 10 and is used to determine the
sign and the magnitude of the multiplication result.
In the following, γ is 1 in order to simplify the description. The resulting signal
multiplied by the multiplier 32 is supplied to the adder 35.
−Rd
[0051]
The multiplier 33 corresponds to a part of the first generation means, and multiplies the digital
musical tone signal Ld for the left channel supplied from the sound source 15 by the
multiplication coefficient + δ . The multiplication coefficient "+ .delta." Is given by the CPU
10 and is used to determine the sign and magnitude of the multiplication result. In the following,
δ is 1 in order to simplify the description. The signal + Ld resulting from the
multiplication by the multiplier 33 is supplied to the adder 35.
[0052]
The adder 35 corresponds to a part of the first generation means, and adds the signal "-Rd"
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supplied from the multiplier 32 and the signal "+ Ld" supplied from the multiplier 33. It is a
thing. A signal (L-R) m of the addition result by the adder 35 is a difference signal (hereinafter
referred to as "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. It shows. The left differential
signal (LR) m is sent to the delay circuit 37.
[0053]
The delay circuit 37 corresponds to a part of the first generation means, and delays the left
difference signal (L-R) m supplied from the adder 35 by a predetermined time and outputs it. The
left differential signal (LR) d output from the delay circuit 37 is sent to the D / A converter 21.
[0054]
The delay circuit 37 is a difference between the distance from the right speaker 26 to the left ear
of the performer and the distance from the left difference speaker 29 for reproducing the left
difference signal (LR) m to the left ear of the performer Phase correction of the right musical
tone component R based on The delay time in the delay circuit 37 is determined based on the
distance difference.
[0055]
By the action of the delay circuit 37, the right musical tone component "R" reaching the left ear
from the right speaker 26 and the right musical tone component "-R" reaching the left ear from
the left differential speaker 29 are canceled out. Only the left tone component can be heard by
the ear.
[0056]
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 left ear of the performer and the left
difference signal (LR) m may be reproduced. The difference between the distance from the left
difference speaker 29 to the left ear of the performer may be small. In such a case, even if the
delay circuit 37 is omitted, there is no problem in practice.
[0057]
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The D / A converter 20 converts the digital musical tone signal Ld for the left channel and the
digital musical tone signal Rd for the right channel output from the DSP 18 into an analog
musical tone signal La for the left channel and an analog musical tone signal Ra for the right
channel, respectively. Convert to
The analog musical tone signal Ra for the right channel converted by the D / A converter 20 is
sent to the amplifier 22, and the analog musical tone signal La for the left channel is sent to the
amplifier 23.
[0058]
The amplifier 22 amplifies the analog musical tone signal Ra for the right channel at a
predetermined amplification factor.
The analog musical 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
amplification factor. The analog musical tone signal La amplified by the amplifier 23 is sent to
the left speaker 27.
[0059]
The D / A converter 21 converts the right difference signal (R-L) d and the left difference signal
(L-R) d as digital signals output from the DSP 18 into the right difference signal (R-L) as analog
signals. A) and left differential signal (L-R) a. The right differential signal (R−L) a converted by
the D / A converter 21 is sent to the amplifier 24, and the left differential signal (L−R) a is sent
to the amplifier 25.
[0060]
The amplifier 24 amplifies the right differential signal (R−L) a at a predetermined amplification
factor. The right differential signal (R-L) a amplified by the amplifier 22 is sent to the right
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differential speaker 28. Further, 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 sent to the left differential speaker 29.
[0061]
The speakers 26 to 29 are known to convert an input electric signal into an acoustic signal.
Predetermined musical tones are emitted by these speakers 26-29.
[0062]
Next, the arrangement of the speakers 26 to 29 in the present electronic musical instrument will
be described.
[0063]
FIG. 3 shows a first embodiment of the arrangement of the speakers 26 to 29, wherein FIG. 3 (A)
is a plan view and FIG. 3 (B) is a side view.
[0064]
In FIG. 3, the right speaker 26 is disposed at the back of the right end of the main body case as
viewed from the performer.
The right speaker 26 emits a tone component R based on the analog tone signal Ra for the right
channel.
The musical tones generated by the right speaker 26 mainly reach the right ear of the performer
as a listener, but a part also reaches the left ear.
[0065]
The left speaker 27 is disposed on the left end side in the figure of the main body case as viewed
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from the performer. The left speaker 27 emits a tone component L based on the analog tone
signal La for the left channel. The musical tones generated by the left speaker 27 mainly reach
the player's left ear, but a part also reaches the right ear.
[0066]
Conventionally, since only the right speaker 26 and the left speaker 27 are provided, the right
ear of the performer is based on the musical tone component "R + L" including not only the
musical tone component R but also the musical tone component L. I was hearing. In addition, to
the left ear, a musical tone based on a musical tone component "L + R" including not only the
musical tone component L but also the musical tone component R component was heard. This
made the sound image localization unclear and also deteriorated the sense of stereo spread.
[0067]
According to the present invention, in addition to the right speaker 26 and the left speaker 27,
the right difference speaker 28 and the left difference for removing extra musical tone
components for the right ear or the left ear, respectively, in order to eliminate the abovementioned drawbacks. The speaker 29 is added.
[0068]
That is, the right difference speaker 28 is disposed on the right end near side in the figure of the
main body case, for example, on the right end side in the figure of the keyboard device 14 as
viewed from the performer.
A musical tone component "R-L" based on the right differential signal (R-L) is emitted from the
right differential speaker 28. The musical tones generated by the right difference speaker 28
reach the player's right ear at an acute angle, and thus hardly reach the left ear.
[0069]
The left difference speaker 29 is disposed on the left end near side in the figure of the main body
case, for example, on the left end side in the figure of the keyboard device 14 as viewed from the
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performer. The left difference speaker 29 emits a tone component "L-R" based on the left
difference signal (L-R) a. The tone generated by the left difference speaker 29 reaches the
player's left ear at an acute angle, and thus hardly reaches the right ear.
[0070]
With this arrangement, the musical tone component R, the musical tone component L, and the
musical tone component "R-L" reach the right ear of the performer, so that the component "L"
and the component "-L" are offset and the component "2R" will be heard with the right ear. This
means that the same effect as when only the right component reaches the right ear is achieved.
[0071]
Further, since the musical tone component R, the musical tone component L and the musical tone
component "LR" reach the left ear of the performer, the component "R" and the component "-R"
are offset and the component "2L" Will be heard with the left ear. This means that the left ear has
the same effect as when only the left component reaches.
[0072]
Therefore, the component that crosses and reaches from the speaker on the opposite side is
canceled to the player's ears, only the right tone component R for the right ear and only the left
tone component L for the left ear. Since it can be heard, it is possible to obtain excellent sound
image localization and stereo widening feeling in stereo reproduction.
[0073]
FIG. 4 shows a second embodiment of the arrangement of the speakers 26 to 29, wherein FIG. 4
(A) is a plan view and FIG. 4 (B) is a side view.
In FIG. 4, the arrangement positions of the right speaker 26 and the left speaker 27 are the same
as in the first embodiment.
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[0074]
In this second embodiment, the right difference speaker 28 is on the right side of the main body
case in the figure as viewed from the performer, for example, on the back side of the keyboard
device 14 in the figure, with the opening on the right front side in the figure. It is arranged to
face. A musical tone component "R-L" based on the right differential signal (R-L) is emitted from
the right differential speaker 28. Most of the musical tones generated by the right difference
speaker 28 reach the right ear of the performer according to the direction of the opening, but
hardly reach the left ear.
[0075]
The left difference speaker 29 is disposed on the left side of the main body case in the drawing
as viewed from the performer, for example, on the back side of the keyboard device 14 in the
drawing with the opening directed to the left front side in the drawing. The left difference
speaker 29 emits a tone component "L-R" based on the left difference signal (L-R) a. Most of the
musical tones generated by the left difference speaker 29 reach the left ear of the performer
according to the direction of the opening, but hardly reach the right ear.
[0076]
With this arrangement, as in the first embodiment, the components that cross from the opposite
speaker reach the player's ears are canceled, and only the right tone component R is present in
the right ear. Since only the left musical tone component L can be heard in the left ear, it is
possible to obtain excellent sound image localization and a sense of stereo spread in stereo
reproduction.
[0077]
FIG. 5 shows a third embodiment of the arrangement of the speakers 26 to 29, and the figure is a
plan view.
In FIG. 5, the arrangement positions of the right speaker 26 and the left speaker 27 are the same
as in the first embodiment.
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[0078]
In the third embodiment, a portable speaker is employed as the right difference speaker 28. The
right difference speaker 28 is disposed on the right side of the player in the drawing with the
opening on the left side in the drawing, that is, the opening directed to the right ear of the player.
A musical tone component "R-L" based on the right differential signal (R-L) is emitted from the
right differential speaker 28. The musical tones generated by the right difference speaker 28
reach the right ear of the player almost at right angles and hardly reach the left ear.
[0079]
Also, a portable speaker is adopted as the left difference speaker 29. The right difference speaker
29 is disposed on the left side of the player in the drawing with the opening on the right side in
the drawing, that is, the opening toward the left ear of the player. The left difference speaker 29
emits a tone component "L-R" based on the left difference signal (L-R) a. The tones generated by
the left difference speaker 29 reach the player's left ear substantially at right angles and hardly
reach the right ear.
[0080]
With this arrangement, as in the first embodiment, the components that cross from the opposite
speaker reach the player's ears are canceled, and only the right tone component R is present in
the right ear. Since only the left musical tone component L can be heard in the left ear, it is
possible to obtain excellent sound image localization and a sense of stereo spread in stereo
reproduction.
[0081]
In the first to third embodiments, the distance from the left speaker 27 to the right ear of the
performer and the right difference speaker 28 reproducing the right difference signal (R-L) m
from the right ear of the performer The phase shift of the left musical tone component L based
on the difference with the distance to the distance, the distance from the right speaker 26 to the
left ear of the performer, and the left difference speaker 29 for reproducing the left difference
signal (LR) m As described above, the phase shift of the right musical tone component R based on
the difference from the distance to the left ear of the performer can be corrected by the delay
circuits 36 and 37, respectively.
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[0082]
As described above, according to each of the above-described embodiments, the left speaker 27
and the right speaker 26 are provided to the left and right sides of the performer, respectively. In
the audio apparatus of an electronic musical instrument in which stereo reproduction is
performed by producing sound based on the signal La and the analog musical tone signal Ra for
the right channel, the analog musical tone signal Ra for the right channel is generated from the
analog musical tone signal La for the left channel. The left difference signal (L-R) a generated by
subtraction is supplied to the left difference speaker 29 provided on the left side to the listener to
emit sound, and the left side from the analog musical tone signal Ra for the right channel. A right
difference signal (R−L) a generated by subtracting the analog tone signal La for the channel is
output to a left difference speaker 28 provided on the right side with respect to the listener.
Supply to so that allowed to sound.
[0083]
As a result, the right musical tone component L is generated from the musical tone component L
generated by the left speaker 27 and reached directly to the left ear of the performer, the musical
tone component R generated by the right speaker and reaching the cross, and the left musical
tone component. The reduced musical tone components "LR" respectively arrive, and as a result,
the right musical tone component R is offset, and only the left musical tone component L reaches
the left ear.
[0084]
Similarly, to the right ear of the performer, a musical tone component R generated by the right
speaker 26 and reached directly, a musical tone component L generated by the left speaker 27
and reached in a cross, and a right musical tone component from the right musical tone
component The musical tone components R−L obtained by subtracting the two reach each
other, and as a result, the left musical tone component L is offset, and only the right musical tone
component R reaches the right ear.
[0085]
Therefore, only the left musical tone component L and the right musical tone component R reach
the left and right ears of the performer, for example, excellent sound image localization as
experienced when listening to music with stereo headphones, for example. It is possible to obtain
a sense of expanse of stereo and stereo, and also to obtain forward localization of a sound image
as experienced when listening to music by speaker reproduction.
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[0086]
The above-described embodiments have a large effect on, for example, automatic performance
data as a stereo-recorded sound source, and in particular, have the largest effect on a sound
source recorded using a dummy head.
Of course, a predetermined effect can be achieved also for an acoustic source reproduced by the
pseudo stereo method.
[0087]
In each of the above embodiments, the case where the listener is the performer has been
described. However, the present invention can be applied similarly to the case where the listener
is opposed to the electronic musical instrument, such as a spectator in the performance hall.
In this case, the orientations of the stereos 26 to 29 can be realized by rotating 180 degrees.
[0088]
As described above in detail, according to the present invention, in an electronic musical
instrument having a stereo reproduction function, it is excellent by canceling out the musical
tone components which cross and reach the left and right ears of the performer. It is possible to
provide an electronic musical instrument sound device capable of obtaining sound image
localization and a sense of stereo spread.
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