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DESCRIPTION JP2017181686

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DESCRIPTION JP2017181686
Abstract: To reduce power consumption in an electronic keyboard instrument equipped with a
surround amplifier for amplifying a musical tone signal and outputting it to an external speaker.
SOLUTION: A performance mode selector 24 for setting a performance characteristic and a
reverberation characteristic indicative of a characteristic of a reverberation signal generated by a
reverberation module 18 in the electronic piano 10, and a surround amplifier for outputting a
musical tone signal to an external speaker group 28 An amplifier selector 36 for controlling the
group 26 and the surround amplifier group 26 is mounted. The amplifier selector 36 specifies an
unused surround amplifier to which a musical tone signal is not input from the surround
amplifier group 26 based on the performance mode or reverb characteristic set by the
performance mode selector 24, and reduces the specified unused surround amplifier. Set to
power consumption mode. [Selected figure] Figure 1
Electronic musical instrument and amplifier control circuit for electronic musical instrument
[0001]
The present invention relates to an electronic musical instrument and an amplifier control circuit
for an electronic musical instrument.
[0002]
Conventionally, an electronic musical instrument such as an electronic piano is known.
11-04-2019
1
The electronic musical instrument may be provided with a built-in speaker. In this case, a musical
tone is output from the built-in speaker. Also, there are cases where an electronic musical
instrument is provided with a line out terminal to which a musical tone signal of a line level not
amplified by an amplifier (amplifying circuit) is output. According to the line out terminal, it is
possible to output the musical tone from the external speaker after the musical tone signal of the
line level is amplified by the external amplifier.
[0003]
Since electronic musical instruments are also one of electronic devices, it is required to reduce
power consumption. Conventionally, techniques for reducing the power consumption of
electronic musical instruments have been proposed.
[0004]
For example, Patent Document 1 discloses a technique for reducing the power consumption of
the entire playing environment including the electronic keyboard instrument by reducing the
power consumption of the external superwoofer connected to the electronic keyboard
instrument. Specifically, in view of the lack of hearing effect of the external super woofer when
the volume is low, the function of the external super woofer is stopped when the master volume
is equal to or less than a predetermined value. Power consumption is reduced.
[0005]
Further, in Patent Document 2, an electronic keyboard instrument is driven in an electronic
keyboard instrument provided with two internal speakers for Lch and Rch, and two internal
amplifiers for supplying amplified musical tone signals to the respective speakers. The power
consumption of the electronic keyboard instrument is reduced by stopping the function of one of
the two built-in amplifiers when the remaining power of the battery becomes equal to or less
than a predetermined value.
[0006]
JP, 2007-81812, A Patent No. 3587485
[0007]
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2
An electronic musical instrument capable of directly connecting an external speaker (without an
external amplifier) is desired in order to obtain a feeling of spatial expansion (for example, a
feeling of hall) of musical tones output from an electronic musical instrument by a compact
configuration .
In order to connect the external speaker directly to the electronic musical instrument, it is
necessary to mount a surround amplifier for outputting the amplified musical tone signal to the
external speaker to the electronic musical instrument.
[0008]
However, the amplifier generally consumes a large amount of power, and mounting a surround
amplifier on an electronic musical instrument increases the power consumption of the electronic
musical instrument.
In particular, if it is possible to connect a large number of external speakers in order to obtain a
greater sense of musical tone spread, a large number of surround amplifiers will be mounted on
the electronic musical instrument, and the power consumption of the electronic musical
instrument will be very large. .
[0009]
An object of the present invention is to reduce power consumption in an electronic musical
instrument equipped with a surround amplifier for amplifying a musical tone signal and
outputting it to an external speaker.
[0010]
An electronic musical instrument according to the present invention comprises a main amplifier
for amplifying an inputted musical tone signal and outputting it to a built-in speaker, and a
surround amplifier for amplifying the inputted musical tone signal and outputting it to an
external speaker connected to a speaker output terminal. A performance mode setting unit
capable of setting a normal mode in which a musical tone signal is input to the main amplifier
without being input to the surround amplifier; and the surround mode when the normal mode is
set by the performance mode setting unit. And an amplifier control unit for setting the amplifier
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in the low power consumption mode.
[0011]
Preferably, a plurality of surround amplifiers are provided corresponding to a plurality of
external speakers, and the performance mode setting unit is configured to set a plurality of
surround modes in which the surround amplifiers to which the musical tone signal is input
among the plurality of surround amplifiers are different. It is possible to set, and based on the
surround mode set by the performance mode setting unit, the amplifier control unit identifies an
unused surround amplifier to which a musical tone signal is not input out of the plurality of
surround amplifiers. The unused surround amplifier is set to the low power consumption mode.
[0012]
Desirably, a reverberation module for generating a reverberation sound signal with respect to the
input original sound signal based on the set reverberation characteristic is further provided, and
the performance mode setting unit is configured to select one of the plurality of surround
amplifiers according to the reverberation characteristic. It is possible to set a reverberation
surround mode in which a surround amplifier to which the reverberation sound signal is input is
switched, and the amplifier control unit sets the reverberation characteristic when the
reverberation surround mode is set by the performance mode setting unit. Based on the plurality
of surround amplifiers, the unused surround amplifier to which the reverberation sound signal is
not input is identified, and the identified unused surround amplifier is set to the low power
consumption mode.
[0013]
Desirably, an external speaker connection determination unit that determines whether or not the
external speaker is connected to the plurality of surround amplifiers is further provided, and the
amplifier control unit is configured to select other than the unused surround amplifier among the
plurality of surround amplifiers. When an external speaker is not connected to the use surround
amplifier, the use surround amplifier is set to the low power consumption mode.
[0014]
Further, the present invention is an amplifier control circuit for an electronic musical instrument
mounted on an electronic musical instrument, comprising: a main amplifier for amplifying an
inputted musical tone signal and outputting the amplified musical tone signal to a built-in
speaker; and amplifying the inputted musical tone signal A surround amplifier for outputting to
an external speaker connected to a speaker output terminal, and a performance mode capable of
setting a normal mode in which a musical tone signal is input to the main amplifier without being
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input to the surround amplifier as a performance mode of the electronic musical instrument A
setting unit, and an amplifier control unit for setting the surround amplifier in a low power
consumption mode when the normal mode is set by the performance mode setting unit.
[0015]
Further, the present invention is an electronic musical instrument comprising the amplifier
control circuit for an electronic musical instrument described above.
[0016]
According to the present invention, power consumption can be reduced in an electronic musical
instrument equipped with a surround amplifier for amplifying a musical tone signal and
outputting it to an external speaker.
[0017]
FIG. 2 is a schematic configuration diagram of an electronic keyboard instrument according to
the present embodiment and an external speaker connected to the electronic keyboard
instrument.
It is a flowchart which shows the 1st processing flow in the electronic keyboard instrument
which concerns on this embodiment.
It is a flowchart which shows the 2nd processing flow in the electronic keyboard instrument
which concerns on this embodiment.
[0018]
Hereinafter, embodiments of the present invention will be described.
In this embodiment, an example in which an electronic keyboard instrument is used as an
electronic musical instrument will be described.
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[0019]
FIG. 1 shows a schematic configuration diagram of an electronic piano 10 as an electronic
keyboard instrument according to the present embodiment and an external speaker connected to
the electronic piano 10.
In the present specification, an example in which the electronic keyboard instrument is the
electronic piano 10 will be described, but the electronic keyboard instrument may be an
electronic organ or an electronic keyboard.
Although not shown in FIG. 1, the electronic piano 10 has a storage unit in which a program for
operating each part of the electronic piano 10 is stored.
[0020]
The CPU 11 is formed of, for example, a microcontroller, and controls each part of the electronic
piano 10 in accordance with a program stored in the storage unit.
[0021]
The sound source memory 12 is configured of, for example, a ROM (Read Only Memory), and
stores tone signal groups output from the electronic piano 10.
In the present embodiment, the sound source memory 12 stores a sampling sound data group
obtained by sampling the sound of the acoustic piano as a tone signal group.
The sampling sound data group includes sampling sound data sampled for each pitch and for
each of a plurality of velocities (intensity of keying).
[0022]
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The keyboard 13 is an operation unit for playing the electronic piano 10, and includes a plurality
of (for example, a total of 88) black keys and white keys.
Each key is provided with a keyboard sensor that detects keying and the strength of the keying.
The keyboard sensor sends to the keyboard control circuit 14 a signal indicating the key being
pressed and the strength of the keying.
[0023]
The keyboard control circuit 14 converts information from a keyboard sensor provided on the
keyboard 13 into a key depression / key release signal and transmits it to the CPU 11.
[0024]
The tone generator circuit 15 reads out a keyed key and a musical tone signal corresponding to
the strength of the keying key from the tone generator memory 12 based on the control from the
CPU 11 receiving the signal from the keyboard control circuit 14 and outputs it to the DSP 16
described later. Do.
In the tone generator circuit 15, processing such as adding envelope data to the tone signal read
out from the tone generator memory 12 may be performed.
[0025]
A DSP (Digital Signal Processor) 16 performs various kinds of processing on the tone signal
output from the tone generator circuit 15. For example, reverberation processing that adds a
reverberation signal to a musical tone signal (original sound signal) from the sound source circuit
15, delay processing that adds such echo sound signal to the original sound signal, tremolo
processing that adds fluctuation to the original sound signal, etc. be able to. FIG. 1 shows a
reverb module 18 that performs reverberation processing, which is one of the processing
performed by the DSP 16.
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[0026]
The reverberation module 18 may be, for example, a software module operating on the DSP 16
or an electronic circuit (reverb circuit). The reverberation module 18 generates a reverberation
sound signal to the original sound signal based on the reverberation characteristic as a
reverberation characteristic set by the performer. Reverb characteristics include the type of
reverb and reverb parameters.
[0027]
The reverberation sound signal generated by the reverberation module 18 in the present
embodiment is generated by simulating the reverberation sound obtained when the acoustic
piano is played in a wide space. By changing the type of reverb, it is possible to obtain a
reverberation signal that simulates reverberation in various spaces. As a type of reverb, for
example, a room type simulating reverberation when playing in a room, a concert hall type
simulating reverberation when playing in a large hall, a reverberation when playing in a
cathedral There is a simulated cathedral type, etc.
[0028]
Further, as the reverberation parameters, there are a depth parameter that determines the size of
the reverberation sound relative to the original sound, and a time parameter that determines the
length of the reverberation sound.
[0029]
The reverberation characteristic is set by a play mode selector 24 described later.
Specifically, the player inputs an instruction for setting the reverb characteristic using an
operation panel (not shown), and the CPU 11 receiving it transmits a control signal to the play
mode selector 24 described later, and the control concerned The performance mode selector 24
having received the signal sets the reverberation characteristic of the reverberation module 18.
[0030]
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The original sound signal before being processed by the reverberation module 18 and the
reverberation sound signal processed by the reverberation module 18 are synthesized by the
adder 20. Here, as the above-mentioned depth parameter is larger, the ratio of the reverberation
sound signal in the synthetic sound signal is larger. The musical tone signal (synthetic sound
signal) processed and output by the DSP 16 is input to the main amplifier MA.
[0031]
The main amplifier MA is an amplification circuit and amplifies the input tone signal. The musical
tone signal amplified by the main amplifier MA is output to the built-in speaker 22. The built-in
speaker 22 receiving the tone signal outputs the tone. Although only one set of the main
amplifier MA and the built-in speaker 22 is shown in FIG. 1, a plurality of sets may be provided.
For example, the built-in speaker 22 may include two top speakers that emit musical tones
upward, and a plurality of tweeter speakers that preferably output musical tones in a high
frequency band. In the present embodiment, the main amplifier MA is an analog amplifier, and a
DAC (Digital Analog Converter) (not shown) is provided at the front stage of the main amplifier
MA. また、メインアンプMAはデジタルアンプであってもよい。
[0032]
The performance mode selector 24 as a performance mode setting unit sets the performance
mode of the electronic piano 10 in accordance with a control signal from the CPU 11 that has
read the player's instruction input from the operation panel. The performance modes include, for
example, a normal mode, a plurality of surround modes, and a reverb surround mode.
[0033]
The normal mode is a mode in which the musical tone signal from the DSP 16 is not inputted to
the surround amplifier group 26 described later, but is inputted to the main amplifier MA and the
musical tone is outputted from the built-in speaker 22.
[0034]
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In the plurality of surround modes, musical tone signals are input to the surround amplifier
group 26 together with the main amplifier MA, and musical tones are output from the built-in
speaker 22 and an external speaker group 28 described later.
In each surround mode, a feeling of spatial spread of different musical tones can be obtained, and
the external speakers to which musical tones are output in each surround mode are different.
The surround mode may include an all-channel surround mode in which musical tones are output
from all of the built-in speakers 22 and the external speaker group 28.
[0035]
In the reverb surround mode, a synthesized sound signal of an original sound signal and a
reverberation sound signal from the reverberation module 18 is output from the built-in speaker
22, and only the reverberation sound signal from the reverberation module 18 is input to the
surround amplifier group 26. Is the mode output from.
[0036]
The surround amplifier group 26 amplifies the input musical tone signal and outputs the
amplified signal to an external speaker group 28 connected to the electronic piano 10.
The electronic piano 10 having the surround amplifier group 26 makes it possible to connect the
external speaker group 28 directly (without an external amplifier) to the electronic piano 10. In
the present embodiment, the electronic piano 10 has four surround amplifiers SAa to d, but the
number of surround amplifiers may be another number. Since one external speaker can be
connected to one surround amplifier, the more the number of surround amplifiers, the more
external speakers can be connected. On the other hand, the surround amplifier has relatively
high power consumption, and the power consumption of the electronic piano 10 increases as the
number of surround amplifiers increases. In the present embodiment, each of the surround
amplifiers SAa to SAd is an analog amplifier, and a DAC (not shown) is provided in the front stage
of each of the surround amplifiers SAa to d. In addition, each surround amplifier SAa to d may be
a digital amplifier.
[0037]
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The outputs of the surround amplifiers SAa-d are output to speaker output terminals 30a-d. By
connecting the cable terminals 32a to 32d of the external speakers 28a to 28d to the speaker
output terminals 30a to 30d, the external speakers 28a to 28d are connected to the surround
amplifiers SAa to d.
[0038]
The surround DSP 34 performs processing of outputting the musical tone signal output from the
DSP 16 to the surround amplifier group 26 in accordance with the performance mode set by the
performance mode selector 24. For example, when the performance mode is the normal mode,
the surround DSP 34 does not output the musical tone signal from the DSP 16 to the surround
amplifier group 26. However, in this case, the output of the musical tone signal from the DSP 16
to the surround DSP 34 may be stopped. In this case, all surround amplifiers SAa to d are unused.
[0039]
When the performance mode is the surround mode, the surround DSP 34 outputs the musical
tone signal from the DSP 16 only to a part of the surround amplifiers corresponding to the
surround modes. For example, in the first surround mode, musical tone signals are output only to
the surround amplifiers SAa and SAb. In this case, the surround amplifiers SAc and SAd are not
used. In the second surround mode, the tone signal is output only to the surround amplifiers SAc
and SAd. In this case, the surround amplifiers SAa and SAb are not used. In the all-channel
surround mode, the surround DSP 34 outputs musical tone signals to all surround amplifiers SAa
to SAd.
[0040]
When the performance mode is the reverb surround mode, the surround DSP 34 switches the
surround amplifier that outputs the musical tone signal from the DSP 16 according to the
reverberation characteristic. In the present embodiment, when the type of reverberation is room
type, the reverberation sound may be relatively small. Therefore, the surround DSP 34 includes
reverberation signal from the DSP 16 (reverb module 18) as a part of a surround amplifier (this
embodiment) Then, the signal is outputted only to the surround amplifiers SAa and SAb). In this
case, the surround amplifiers SAc and SAd are not used.
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[0041]
Further, in the present embodiment, when the cathedral type is selected as the type of
reverberation, in addition to the surround amplifiers SAa and SAb, the external speakers 28c and
28d disposed upward for feeling a wide space above The reverberation sound signal is also
output to the corresponding surround amplifiers SAc and SAd. Even when the cathedral type is
selected, when the depth parameter is set to a value smaller than a predetermined value (that is,
to reduce the reverberation effect), there is no need to feel the upper space, The output of the
reverberation sound signal to the surround amplifiers SAc and SAd may be stopped. In this case,
the surround amplifiers SAc and SAd are not used even in the cathedral type.
[0042]
As described above, the surround amplifiers used in the surround amplifier group 26 differ
depending on the performance mode or the reverberation characteristics (the type of reverb or
the reverberation parameter). In other words, there is an unused surround amplifier in the
surround amplifier group 26 depending on the performance mode and the reverberation
characteristic.
[0043]
The amplifier selector 36 as an amplifier control unit controls the surround amplifier group 26.
Specifically, all or part of the surround amplifier group 26 is set to the low power consumption
mode according to the performance mode set by the performance mode selector 24 or the
reverberation characteristics. Specifically, based on the set performance mode or reverb
characteristic, an unused surround amplifier is identified from the surround amplifier group 26,
and the identified unused surround amplifier is set to the low power consumption mode. When
identifying an unused surround amplifier, information indicating the unused surround amplifier
may be received from the surround DSP 34.
[0044]
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For example, when the play mode is set to the normal mode by the play mode selector 24, the
amplifier selector 36 specifies all surround amplifiers SAa to SAd included in the surround
amplifier group 26 as unused surround amplifiers. Then, the surround amplifiers SAa to SAd are
set to the low power consumption mode.
[0045]
When the play mode is set to the first surround mode by the play mode selector 24, the amplifier
selector 36 specifies the surround amplifiers SAc and SAd as unused surround amplifiers and
sets the surround amplifiers SAc and SAd in the low power consumption mode. . When the
performance mode is set to the second surround mode, the amplifier selector 36 specifies the
surround amplifiers SAa and SAb as unused surround amplifiers, and sets the surround
amplifiers SAa and SAb in the low power consumption mode.
[0046]
When the performance mode is set to the reverb surround mode by the performance mode
selector 24, the amplifier selector 36 identifies an unused surround amplifier based on the set
reverb characteristic. For example, when the room type is set as the type of reverb, the surround
amplifiers SAc and SAd are specified as unused surround amplifiers, and the surround amplifiers
SAc and SAd are set to the low power consumption mode. Also, if the type of reverberation is a
cathetalal type, if the depth parameter is less than a predetermined value, the surround
amplifiers SAc and SAd are identified as unused surround amplifiers, and the surround amplifiers
SAc and SAd are set to the low power consumption mode. Set
[0047]
When all the surround amplifiers SAa to SA are used (for example, when the performance mode
is the all-channel surround mode or in the reverb surround mode, the type of the reverberation is
a cathedral type and the depth parameter has a predetermined value) In the above case, etc.), the
amplifier selector 36 does not perform the process of setting the surround amplifiers SAa to SA
in the low power consumption mode.
[0048]
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A specific method of setting the unused surround amplifier in the low power consumption mode
may be, for example, a method of shutting off the power supplied to the unused surround
amplifier by a switch or a relay.
Moreover, if it has a low power consumption mode as an operation mode of the surround
amplifier itself, it may be used. Furthermore, when the surround amplifier is a digital amplifier,
the power consumption of the unused surround amplifier can be reduced by performing mute
control on the unused surround amplifier. In the digital amplifier, a pulse wave is constantly
output even when there is no input signal. Therefore, power consumption can be reduced by
performing mute control on the digital amplifier and stopping the output of the pulse wave.
According to the mute control, there is also an advantage that the time required to return from
the low power consumption mode to the normal mode can be reduced as compared to the
method of shutting off the power.
[0049]
Desirably, the speaker connection detection part 38 as an external speaker connection
determination part is provided. The speaker connection detection unit 38 detects whether or not
the cable terminals 32a to 32d of the external speakers 28a to 28d are connected to the speaker
output terminals 30a to 30d. That is, the speaker connection detection unit 38 determines
whether the external speakers 28a to 28d are connected to the surround amplifiers SAa to d.
[0050]
The amplifier selector 36 may set the surround amplifier in the low power consumption mode
according to the detection result of the speaker connection detection unit 38 in addition to the
performance mode and the reverberation characteristics set by the performance mode selector
24. When an external speaker is not connected to a surround amplifier (use surround amplifier)
other than the unused surround amplifier specified by the performance mode and the
reverberation characteristic, the tone signal from the use surround amplifier is not output from
the external speaker . That is, it is not necessary to output a musical tone signal from the use
surround amplifier. Therefore, the amplifier selector 36 may set the surround amplifier to which
the external speaker is not connected to the low power consumption mode even if it is a use
surround amplifier.
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[0051]
The schematic configuration of the electronic piano 10 according to the present embodiment is
as described above. Among the components shown in FIG. 1, the functions of the performance
mode selector 24, the amplifier selector 36, and the speaker connection detection unit 38 can be
realized using hardware such as a processor, for example. Also, it may be realized by cooperation
of hardware such as a processor and software for operating the processor.
[0052]
Hereinafter, the flow of the first processing flow in the electronic piano 10 will be described
according to the flowchart shown in FIG.
[0053]
In step S10, the performance mode selector 24 sets the performance mode in accordance with
the control signal from the CPU 11 that has read the instruction from the player.
When the performance mode is the reverb surround mode, the performance mode selector 24
further sets the reverb characteristic in accordance with the control signal from the CPU 11 that
has read the instruction from the performer.
[0054]
In step S12, the amplifier selector 36 determines whether the performance mode set in step S10
is the reverb surround mode.
[0055]
If the performance mode is other than the reverb surround mode, the process proceeds to step
S14.
In step S14, the amplifier selector 36 specifies an unused surround amplifier based on the set
performance mode.
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[0056]
If the reverb surround mode is set, the process proceeds to step S16. In step S16, the amplifier
selector 36 specifies an unused surround amplifier based on the reverberation characteristic set
in step S10.
[0057]
In step S18, the amplifier selector 36 sets the unused surround amplifier specified in step S14 or
step S16 to the low power consumption mode.
[0058]
Hereinafter, the flow of the second processing flow in the electronic piano 10 will be described
according to the flowchart shown in FIG.
The second processing flow is a processing flow for specifying a surround amplifier to be set to
the low power consumption mode based on the detection result of the speaker connection
detection unit 38 in addition to the performance mode or the reverberation characteristic.
[0059]
In the flowchart of FIG. 3, since the process contents in the step before step S30 are the same as
the process contents of the first process flow, the same step numbers as in FIG.
[0060]
In step S30, based on the detection result of the speaker connection detection unit 38, the
amplifier selector 36 connects external speakers among the use surround amplifiers that are
surround amplifiers other than the unused surround amplifier specified in step S14 or step S16.
It is determined whether there is a surround amplifier that has not been done.
[0061]
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If there is a surround amplifier to which no external speaker is connected among the use
surround amplifiers, the process proceeds to step S32.
In step S32, the amplifier selector 36 sets the unused surround amplifier specified in step S14 or
step S16 and the used surround amplifier to which the external speaker is not connected in the
low power consumption mode.
[0062]
If there is no surround amplifier to which the external speaker is not connected among the used
surround amplifiers, the process proceeds to step S34.
In step S34, the amplifier selector 36 sets the unused surround amplifier identified in step S14 or
step S16 to the low power consumption mode.
[0063]
According to the present embodiment described above, it is possible to reduce the power
consumption of the electronic piano 10 on which the surround amplifier group 26 is mounted in
order to directly connect the external speaker group 28. For example, in the electronic piano 10,
while having the feature that the external speaker group 28 can be directly connected, the
conventional electronic piano without the surround amplifier group 26 when operating in the
normal mode not using the external speaker group 28. Power consumption equivalent to
[0064]
Further, according to the present embodiment, according to the state of the electronic piano 10
which can be varied, such as the performance mode, the reverb characteristic, or the connection
state of the external speaker, the electronic is adaptively applied as long as the outputted musical
tone is not affected. Power consumption of the piano 10 can be reduced.
[0065]
As mentioned above, although embodiment which concerns on this invention was described, this
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invention is not limited to the said embodiment, A various change is possible unless it deviates
from the meaning of this invention.
[0066]
DESCRIPTION OF SYMBOLS 10 electronic piano, 11 CPU, 12 sound source memory, 13
keyboards, 14 keyboard control circuits, 15 sound source circuits, 16 DSP, 18 reverb modules,
20 adders, 22 built-in speakers, 24 performance mode selectors, 26 surround amplifier groups,
28 external Speaker group, 28a-d external speaker, 30a-d speaker output terminal, 32a-d cable
terminal, 34 surround DSP, 36 amplifier selector, 38 speaker connection detector, MA main
amplifier, SAa-d surround amplifier.
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