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JP2006267495

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DESCRIPTION JP2006267495
The present invention provides an electronic musical instrument capable of reducing
manufacturing costs while at least providing two systems of outputs, ie, a speaker output and an
AUX output. In the equalizer section setting process, when a headphone plug is inserted, a
parameter for headphone output is written to the equalizer section 13b1, while when a
headphone plug is not inserted, a parameter for speaker output is equal to the equalizer section
13b1. Write to In the volume control unit setting process, when the selected AUX mode is the
FIX (PRE) mode, the volume control unit 13b2 controls the parameter value for controlling the
volume level of the inputted musical tone signal to a fixed value. While the selected AUX mode is
the VARI (POST) mode, the parameter value for controlling the volume level of the input tone
signal to a value according to the operation position of the volume 14 c when the selected AUX
mode is the VARI (POST) mode Are written to the volume control unit 13b2. [Selected figure]
Figure 2
Electronic musical instrument
[0001]
The present invention relates to an electronic musical instrument provided with at least two
outputs of a speaker output and an AUX (auxiliary) output.
[0002]
Electronic musical instruments having three outputs, ie, speaker output, headphone output and
AUX (auxiliary) output, are conventionally known.
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[0003]
FIG. 4 is a block diagram showing a part of such a conventional electronic musical instrument,
specifically, a digital signal processing circuit 13 'and a sound system 14'.
[0004]
As shown in the figure, the digital musical tone signal generated by the sound source unit 13a in
the digital signal processing circuit 13 'is input to a D / A (Digital-to-Analog) converter 14a in the
sound system 14', It is converted into an analog tone signal through the D / A converter 14a.
The analog musical tone signal output from the D / A converter 14a is branched into two
systems, and the musical tone signal of one system is input to the preamplifier 14b, and the
musical tone signal of the other system is an AUX-FIX (PRE) amplifier It is input to 14k.
[0005]
The AUX-FIX (PRE) amplifier 14k amplifies the input tone signal with a predetermined gain, and
outputs the amplified signal to the AUX-FIX (PRE) terminal 14l.
[0006]
The preamplifier 14b is provided with a volume 14c, and the user can change the gain of the
preamplifier 14b using the volume 14c, that is, can variably control the volume level of the input
analog musical tone signal.
[0007]
The output from the preamplifier 14b is branched into three systems, the musical tone signal of
the first system is input to the analog equalizer 14d, the musical tone signal of the second system
is input to the headphone amplifier 14g, and the third system of The musical tone signal is input
to an AUX-VARI (POST) amplifier 14i.
[0008]
The analog equalizer 14d equalizes the input tone signal, and outputs the equalized tone signal to
the power amplifier 14e.
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The power amplifier 14e amplifies the equalized musical tone signal with a predetermined gain,
and then outputs the amplified musical tone signal to the speaker 14f.
[0009]
The headphone amplifier 14g amplifies the input musical tone signal with a predetermined gain
(but different from any gain of the AUX-FIX (PRE) amplifier 14k and the power amplifier 14e),
and outputs the amplified signal to the headphone terminal 14h.
[0010]
The AUX-VARI (POST) amplifier 14i also amplifies the input tone signal with a predetermined
gain (but different from any gain of the AUX-FIX (PRE) amplifier 14k, the power amplifier 14e
and the headphone amplifier 14g), Output to the AUX-VARI (POST) terminal 14j.
[0011]
Also, it is detected whether or not the signal input terminal (headphone plug) of the headphone is
inserted in the headphone terminal (headphone jack), and the method of applying the digital
effect to the digital musical tone signal is changed according to the detection result. Such
electronic musical instruments are also known (see, for example, Patent Document 1).
[0012]
By combining such two types of conventional electronic musical instruments, the expensive
analog equalizer 14d is omitted, and the digital equalizer originally provided in the digital signal
processing circuit 13 'is substituted for the equalization performed by the analog equalizer 14d.
Specifically, when the headphone plug is inserted in the headphone jack, the parameter for the
headphone is set in the digital equalizer, while when the headphone plug is not inserted in the
headphone jack, the parameter for the speaker in the digital equalizer (analog equalizer An
electronic musical instrument in which the digital equalizer can set the same equalization as the
equalization performed by 14d can be easily conceived and realized.
JP 2000-358294 A
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[0013]
However, in the combination of the above two types of conventional electronic musical
instruments, although it is effective when the output system of the musical tone signal is only
two systems of the speaker output and the headphone output, two of them, AUX, are effective.
When an output system is added, a D / A converter is required at least for each of the two output
systems of AUX, which increases the manufacturing cost.
[0014]
The present invention has been made focusing on this point, and it is an object of the present
invention to provide an electronic musical instrument capable of reducing the manufacturing
cost while at least providing two systems of outputs of speaker output and AUX output. Do.
[0015]
In order to achieve the above object, the electronic musical instrument according to claim 1
generates a digital musical tone signal and outputs the generated digital musical tone signal as at
least first and second systems of digital musical tone signals; An equalizer unit for equalizing the
digital musical tone signal of the first system output by the sound source unit; a first output unit
for outputting the digital musical tone signal of the first system equalized by the equalizer unit; A
volume control unit for performing volume control on the digital musical tone signal of the
second system outputted by the sound source unit; and a second for outputting the digital
musical tone signal of the second system whose volume is controlled by the volume control unit.
Digital signal processing means having an output section of the digital signal processor, and
digital musical tone signals output from the first output section of the digital signal processing A
first D / A converter for converting into a signal, and an analog volume control circuit for
controlling the volume of an analog musical tone signal from the first D / A converter,
comprising an operator for varying the volume level A second D / A converter for converting a
digital musical tone signal output from the second output section of the digital signal processing
means into an analog musical tone signal; and a volume level set by the operation element.
Regardless, it is characterized by including setting means for setting a predetermined volume
value in the volume control unit of the digital signal processing means.
[0016]
In order to achieve the above object, the electronic musical instrument according to claim 2
generates a digital musical tone signal and outputs the generated digital musical tone signal as at
least first and second systems of digital musical tone signals, and An equalizer unit for equalizing
the digital musical tone signal of the first system output by the sound source unit; a first output
unit for outputting the digital musical tone signal of the first system equalized by the equalizer
unit; A volume control unit for performing volume control on the digital musical tone signal of
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the second system outputted by the sound source unit; and a second for outputting the digital
musical tone signal of the second system whose volume is controlled by the volume control unit.
Digital signal processing means having an output section of the digital signal processor, and
digital musical tone signals output from the first output section of the digital signal processing A
first D / A converter for converting into a signal, and an analog volume control circuit for
controlling the volume of an analog musical tone signal from the first D / A converter,
comprising an operator for varying the volume level A second D / A converter for converting a
digital musical tone signal output from the second output section of the digital signal processing
means into an analog musical tone signal; a first mode and a second mode When the first mode is
selected by the selection means for selecting any of the selection means and the selection means,
a volume value according to the volume level set by the operation element is set in the volume
control unit of the digital signal processing means On the other hand, when the second mode is
selected by the selection means, the volume control of the digital signal processing means is
performed for a predetermined volume value regardless of the volume level set by the operation
element. It characterized by having a setting means for setting the.
[0017]
In order to achieve the above object, an electronic musical instrument according to a third aspect
of the present invention generates a digital musical tone signal and outputs the generated digital
musical tone signal as digital musical tone signals of at least first and second systems. An
equalizer unit for equalizing the digital musical tone signal of the first system output by the
sound source unit; a first output unit for outputting the digital musical tone signal of the first
system equalized by the equalizer unit; A volume control unit for performing volume control on
the digital musical tone signal of the second system outputted by the sound source unit; and a
second for outputting the digital musical tone signal of the second system whose volume is
controlled by the volume control unit. Digital signal processing means having an output section
of the digital signal processor, and digital musical tone signals output from the first output
section of the digital signal processing A first D / A converter for converting into a signal, and an
analog volume control circuit for controlling the volume of an analog musical tone signal from
the first D / A converter, comprising an operator for varying the volume level A main output
terminal for outputting an analog musical tone signal whose volume is controlled by the analog
volume control circuit as a main output, and a headphone output terminal for outputting an
analog musical tone signal whose volume is controlled by the analog volume control circuit as a
headphone output And detection means for detecting whether or not the headphone signal input
terminal is inserted in the headphone output terminal, and the detection means detects that the
headphone signal input terminal is inserted in the headphone output terminal. Parameter setting
for setting the predetermined parameter in the equalizer section of the digital signal processing
means Means, a second D / A converter for converting a digital musical tone signal output from
the second output section of the digital signal processing means into an analog musical tone
signal, and any of the first mode and the second mode When the first mode is selected by the
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selection means and the selection means, the volume value according to the volume level set by
the operation element is set in the volume control unit of the digital signal processing means On
the other hand, when the second mode is selected by the selection means, a volume value setting
for setting a predetermined volume value in the volume control unit of the digital signal
processing means regardless of the volume level set by the operation element And means.
[0018]
According to the first aspect of the present invention, the digital signal processing means
equalizes the musical tone signal to be output, and the analog equalizer is eliminated, so that the
manufacturing cost can be reduced.
Further, since the equalizer is digitized, its equalizing characteristic can be easily changed
according to the setting of the user.
[0019]
According to the second aspect of the present invention, the digital signal processing means
equalizes the musical tone signal to be output, and the analog equalizer is eliminated, so that the
manufacturing cost can be reduced.
Further, it is possible to select one of the first mode and the second mode, and when the first
mode is selected, the volume value corresponding to the volume level set by the operation
element is set to the digital signal processing means. While setting in the volume control unit,
when the second mode is selected, a predetermined volume value is set in the volume control
unit of the digital signal processing means regardless of the volume level set by the operation
element. Therefore, the two conventional AUX terminals are replaced by one AUX terminal, and
any one of the musical tone signals output from the two conventional AUX terminals can be
selected and output from one AUX terminal. Only one D / A converter needs to be added, which
can reduce the manufacturing cost.
Further, since the equalizer is digitized, its equalizing characteristic can be easily changed
according to the setting of the user.
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[0020]
According to the invention as set forth in claim 3, in addition to the above-mentioned effects
exhibited by the invention as set forth in claim 2, when the signal input terminal of the
headphone is inserted in the headphone output terminal, the musical tone signal for the
headphone from the headphone output terminal Can be output.
[0021]
Hereinafter, embodiments of the present invention will be described in detail based on the
drawings.
[0022]
FIG. 1 is a block diagram showing a schematic configuration of an electronic musical instrument
according to an embodiment of the present invention.
[0023]
As shown in the figure, the electronic musical instrument according to the present embodiment is
provided on a performance operation element 1 including a keyboard for inputting pitch
information, and on a control panel (not shown), and has a plurality of elements for inputting
various information. A panel operator 2 including a switch and a ten key, a detection circuit 3 for
detecting an operation state of the performance operator 1, a detection circuit 4 for detecting an
operation state of the panel operator 2, and a CPU 5 for controlling the entire device. The ROM 6
stores control programs executed by the CPU 5, various table data, etc., the RAM 7 temporarily
stores performance data, various input information, calculation results, etc., and measures
interrupt time and various time in timer interrupt processing. Timer 8 and various information
etc., for example, liquid crystal display (LCD) or CRT (Cathode Ray Tube) display and light
emitting diode (LED) And the like, an external storage device 10 storing various application
programs including the control program, various music data, various data, etc., and inputting a
MIDI (Musical Instrument Digital Interface) message from the outside And a MIDI interface (I / F)
11 for outputting MIDI messages to the outside, and a communication interface for transmitting
/ receiving data to / from, for example, a server computer (hereinafter abbreviated as "server")
102 via the communication network 101. (I / F) 12, digital signal processing circuit 13 for
converting performance data input from performance operation element 1, performance data set
in advance, etc. into musical tone signals and applying various effects to the musical tone signals;
Convert a tone signal from the digital signal processing circuit 13 into a sound, for example, D /
A Exchanger or amplifier is constituted by a sound system 14 such as a speaker.
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[0024]
The above components 3 to 13 are mutually connected via a bus 15, the timer 8 and the sound
system 14 are connected to the CPU 5, the other MIDI device 100 is connected to the MIDI I / F
11, and the communication I / F 12 is Is connected to the communication network 101, and a
sound system 14 is connected to the sound source circuit 13.
Here, the communication I / F 12 and the communication network 101 are not limited to wired
ones, and may be wireless ones.
Also, both types may be provided.
[0025]
The CPU 5 incorporates an A / D (Analog-to-Digital) converter (not shown), and based on the
digital value input from the A / D converter, as described later with reference to FIG. The
operation position of the volume 14 c in the sound system 14 is detected.
[0026]
Examples of the external storage device 10 include a flexible disk drive (FDD), a hard disk drive
(HDD), a CD-ROM drive, and a magneto-optical disk (MO) drive.
Then, as described above, the external storage device 10 can also store the control program to be
executed by the CPU 5, and when the control program is not stored in the ROM 6, the control
program is stored in the external storage device 10 By loading it into the RAM 7, the CPU 5 can
be made to operate in the same manner as when the control program is stored in the ROM 6.
In this way, control programs can be added or upgraded easily.
[0027]
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The MIDI I / F 11 is not limited to a dedicated one, and may be configured by a general-purpose
interface such as RS-232C, USB (Universal Serial Bus), or IEEE 1394 (I-Triple 1394).
In this case, data other than MIDI messages may be simultaneously transmitted and received.
[0028]
As described above, the communication I / F 12 is connected to a communication network 101
such as a LAN (Local Area Network), the Internet, or a telephone line, for example, and is
connected to the server 102 via the communication network 101.
When the above programs and various parameters are not stored in the external storage device
10, the communication I / F 12 is used to download the programs and parameters from the
server 102.
The electronic musical instrument serving as the client transmits a command requesting
download of a program or parameter to the server 102 via the communication I / F 12 and the
communication network 101.
In response to the command, the server 102 distributes the requested program or parameter to
the electronic musical instrument via the communication network 101, and the electronic
musical instrument receives the program or parameter via the communication I / F 12 for
external use. By accumulating in the storage device 10, the download is completed.
[0029]
In the present embodiment, the digital signal processing circuit 13 is configured by a so-called
sound source LSI (Large Scale Integrated Circuit), and has not only a sound source function, but
also a function to give an acoustic effect, an equalizer function, a volume adjustment function,
and the like. ing.
Of course, the present invention is not limited to the sound source LSI, and may be configured by
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a general-purpose processor such as a DSP (Digital Signal Processor), or may be configured by a
plurality of LSIs.
[0030]
Although the electronic musical instrument according to the present embodiment takes the form
of a keyboard instrument, the present invention is not limited to this, and may take the form of a
string instrument type, a wind instrument type, a percussion instrument type or the like.
[0031]
FIG. 2 is a block diagram showing the detailed configuration of the digital signal processing
circuit 13 and the sound system 14 included in the electronic musical instrument of FIG. 1. In
FIG. 2, the same components as those in FIG. It is done.
Note that FIG. 2 also functions as a diagram for explaining the control process executed by the
electronic musical instrument according to the present embodiment, so FIG. 2 shows the
configuration necessary for describing this control process, that is, the detection circuit. 4, CPU 5,
ROM 6 and RAM 7 are also described.
Further, in FIG. 2, thick wavy lines indicate the state of processing by software.
[0032]
The digital signal processing circuit 13 and the sound system 14 of FIG. 2 are different from the
conventional digital signal processing circuit 13 'and sound system 14' of FIG. 4 in the following
points.
(1) The conventional analog equalizer 14d of FIG. 4 is deleted, and the function of the analog
equalizer 14d is substituted by the equalizer unit 13b1 in the digital signal processing circuit 13.
(2) Two conventional AUXs of FIG. Replace the terminals, ie AUX-VARI (POST) terminal 14j and
AUX-FIX (PRE) terminal with one AUX terminal 14o, and output from AUX-VARI (POST) terminal
14j or AUX-FIX (PRE) terminal 14l (3) Due to the difference between the above (1), the signal
input terminal (headphone plug) of the headphone is connected to the headphone terminal
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(headphone jack). (4) A system of digital musical tone signals output from the AUX terminal 14 o
due to the difference between the above (2) and the point that it is detected whether or not it is
inserted. And a D / A converter 14m for converting the digital musical tone signal from the
volume control unit 13b2 into an analog musical tone signal, and a sound volume control unit
13b2 for controlling the sound volume level. The operation position of the volume 14c is
detected by the difference in the above.
[0033]
As shown in FIG. 2, the digital signal processing circuit 13 has at least two systems of outputs,
one of which is an output for the headphone terminal 14 h and the other of which is an output
for the AUX terminal 14 o.
And each system is equipped with D / A converters 14a and 14m, respectively.
In the present embodiment, the musical tone signals of each system are assumed to be stereo
musical tone signals, but the present invention is not limited to this and may be monaural
musical tone signals.
[0034]
Further, an output of another system may be provided. As an example of the output of another
system, there can be mentioned an output for causing a separate speaker to generate a musical
tone based on a musical tone signal to which an acoustic effect such as reverberation is applied.
[0035]
The volume 14 c is constituted by, for example, a plurality of operators fixed on one axis, and
when the user rotates the axis, the plurality of operators interlock in accordance with the
rotation. Then, one of the plurality of operators is used as a volume position detection operator.
For example, a variable resistor whose resistance value changes in interlock with this volume
position detecting operator is provided, and the voltage across the variable resistor is converted
by an A / D converter built in the CPU 5 and converted The operation position of the volume 14
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c can be detected by calculating the digital value of the value of the The A / D converter is not
limited to one built in the CPU 5, but may be one independent from the CPU 5 and connected to
the bus 15.
[0036]
The headphone terminal 14 h is provided with a sensor that detects whether a signal input
terminal (headphone plug) of a headphone is inserted. This sensor may employ any detection
method. For example, a mechanical contact system, an optical system, and an electrical system
can be considered. When a mechanical contact type sensor is adopted, the contact is turned ON /
OFF as the headphone plug is inserted into / removed from the headphone terminal (headphone
jack) 14h, and the ON / OFF state of the contact is detected via the detection circuit 4, for
example. , CPU 5 may read it. In the present embodiment, the headphone terminal 14 h is
provided on the panel or in the vicinity thereof, and the headphone terminal 14 h is provided
with the function of reading the ON / OFF state of the contact point in the detection circuit 4.
This is because it is preferable to provide the detection circuit 4 closest to the position where is
provided with the function of detecting the ON / OFF state of the contact point. Of course, a
detection circuit that detects only the ON / OFF state of the contact point is provided
independently of the detection circuit 4 and connected to the bus 15, and the CPU 5 is read by
the detection circuit 4 via the bus 15. The ON / OFF state of the contact may be read from the
detection circuit 4.
[0037]
Control processing executed by the electronic musical instrument configured as described above
will be described in detail with reference to FIG.
[0038]
FIG. 3 is a flow chart showing the procedure of control processing executed by the electronic
musical instrument of the present embodiment, particularly the CPU 5, and this control
processing is an interrupt which is periodically activated each time the timer 8 measures a
predetermined time. It is part of processing.
[0039]
In this control processing, the following processing is performed.
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That is, (a) It is detected whether or not a headphone plug is inserted in the headphone jack, and
a parameter according to the detection result is written (set) in the equalizer unit 13b1. Equalizer
unit setting processing (b) in FIG. A mode in which a tone signal similar to the tone signal output
from the AUX-VARI (POST) terminal 14j is output from the AUX terminal 14o (hereinafter
referred to as "VARI (POST) mode") Control the volume of the parameter corresponding to the
selected AUX mode in a mode (hereinafter referred to as "FIX (PRE) mode") of outputting a
musical tone signal similar to the musical tone signal outputted from the terminal 14l from the
AUX terminal 14o. It is a sound volume control unit setting process which is written (set) in the
unit 13b2.
[0040]
The electronic musical instrument according to the present embodiment is configured to be able
to select either the VARI (POST) mode or the FIX (PRE) mode by the user's panel operation, and
the selected mode is the RAM 7. It is comprised so that it may be preserve | saved at the
preservation | save area ensured at the predetermined position of.
[0041]
In the equalizer section setting process of (a), it is detected whether or not a headphone plug is
inserted in the headphone jack (step S1). As a result of the detection, when a headphone plug is
inserted in the headphone jack, headphone output Parameters are read out from the ROM 6 (step
S2) and written in the equalizer section 13b1 of the digital signal processing circuit 13 (step S4).
When no headphone plug is inserted into the headphone jack, the parameters for speaker output
are ROM 6 Are read out (step S3), and written to the equalizer unit 13b1 of the digital signal
processing circuit 13 (step S4).
Thereby, the characteristics of the output signal to the speaker 14 f and the characteristics of the
output signal from the headphone terminal 14 h are changed.
Here, the parameter for headphone output is assumed to be a parameter that causes the
equalizer unit 13b1 to perform signal processing to output an output signal having a flat
frequency characteristic from the headphone terminal 14h. This is merely an example, and the
equalizer unit 13b1 may perform signal processing to output an output signal of a certain
characteristic specialized to a certain kind of headphones from the headphone terminal 14h.
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Also, depending on whether a headphone plug is inserted in the headphone jack, the digital
signal processing circuit 13 controls how to apply an acoustic effect such as surround sound or
sound image localization to the generated digital musical tone signal. You may Furthermore, with
respect to the parameter for speaker output, the influence on the sound emission from the
speaker due to the structure of the case of the electronic musical instrument is corrected, and the
signal processing is performed to the equalizer unit 13b1 such that the frequency characteristic
becomes flat. It is assumed that the parameters will be
[0042]
Note that, by digitizing the equalizer section 13b1, various characteristics can be made more
easily (in a very simple method of merely writing a parameter value according to the target
characteristic) compared to the conventional analog equalizer (in a very simple method) Can be
applied to
[0043]
In the volume control unit setting process of (b), when the selected AUX mode is the FIX (PRE)
mode, the volume control unit 13b2 sets the volume level of the inputted musical tone signal to a
fixed value (operation position of the volume 14c The parameter value (fixed value) for
controlling to a fixed value not related to V) is read out from the ROM 6 (step S6), and written to
the volume control unit 13b2 of the digital signal processing circuit 13 (step S8) When the mode
is VARI (POST) mode, the volume control unit 13b2 sets the volume level of the input musical
tone signal to a value according to the operation position of the volume 14c (a value
corresponding to increase or decrease of the amplification factor of the preamplifier 14b). The
parameter value for control is read out from the ROM 6 (step S7), and is written in the volume
control unit 13b2 (step S8).
As a result, as with the speaker output and the headphone output, the volume of the AUX output
can be increased or decreased.
[0044]
The switches in FIG. 2 indicate the processing in the VARI (POST) mode when in the ON state,
and indicate the processing in the FIX (PRE) mode when in the OFF state.
[0045]
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14
In the present embodiment, various parameter values are read out from the ROM 6. However, the
present invention is not limited to this, and values generated by calculation by the CPU 5 may be
used.
[0046]
As described above, in the present embodiment, the conventional analog equalizer is deleted, and
the function of the analog equalizer is substituted by the equalizer unit 13 b 1 in the digital
signal processing circuit 13, and the equalizer unit 13 b 1 is originally provided. Therefore, the
manufacturing cost can be reduced.
[0047]
Also, the conventional two AUX terminals are replaced by one AUX terminal 14o, and one of the
musical tone signals output from the two conventional AUX terminals can be selected and output
from the AUX terminal 14o. Only one addition of the / A converter is sufficient, which can reduce
the manufacturing cost.
[0048]
The volume control in the preamplifier 14b is also performed by the volume control function
originally existing in the digital signal processing circuit 13, and the volume control is not
performed in the analog circuit of the preamplifier 14b, thereby further reducing the
manufacturing cost. However, in this method, the output from the D / A converter 14a is output
at the maximum gain of the analog circuit in the subsequent stage, which is undesirable because
the S / N ratio is greatly deteriorated.
[0049]
FIG. 1 is a block diagram showing a schematic configuration of an electronic musical instrument
according to an embodiment of the present invention.
It is a block diagram which shows the detailed structure of the digital musical tone signal circuit
contained in the electronic musical instrument of FIG. 1, and a sound system.
It is a flowchart which shows the procedure of the control processing which the electronic
musical instrument of FIG. 1, especially CPU performs.
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FIG. 16 is a block diagram showing a partial configuration of a conventional electronic musical
instrument, specifically, a digital musical tone signal circuit and a sound system.
Explanation of sign
[0050]
4 detection circuit (detection means), 5 CPU (setting means, selection means, detection means,
parameter setting means, volume value setting means), 13 digital musical tone signal circuit
(digital signal processing means), 14a D / A converter (first 1) D / A converter), 14b preamplifier
(analog volume control circuit), 14c volume (controller), 14m D / A converter (second D / A
converter)
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