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JP2000214854

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2000214854
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
bass reproducing apparatus for an electronic musical instrument, provided in an electronic piano
or the like, for reproducing low frequency components of a musical tone signal.
[0002]
2. Description of the Related Art FIG. 8 shows an example of a conventional electronic piano
exterior and speaker device. As shown in the figure, the speaker device 52 of the electronic piano
51 is a 3-way type, and a pair of left and right bass speakers 53, 53, a mid tone speaker 54, 54
and a high tone speaker 55, 55 respectively. Is equipped. These speakers 53 to 55 are of the
usual type having a diaphragm. The bass speakers 53, 53 are accommodated in the left and right
speaker boxes 56, 56. The mid-tone speaker 54 is disposed above the bass speaker 53, and the
high-tone speaker 55 is disposed outside thereof.
[0003]
FIG. 6 shows a circuit configuration for controlling the sound generation of the electronic piano
51. According to this configuration, the operation information of various switches such as the
power switch of the operation panel 11 and the tone color selection switch (not shown) is
detected by the panel scan circuit 12 and the key depression information of the keyboard 13 is
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the keyboard scan circuit 14. The detected signals are sent to a CPU (central processing unit) 16
via a system bus 15. The CPU 16 determines the contents of the musical tone to be generated
according to the detection signals and data temporarily stored in the RAM 17 in accordance with
the control program stored in the ROM 18, and the control signal based on the calculation result
is It outputs to the circuit 19.
[0004]
The tone generator circuit 19 reads waveform data from the waveform memory 20 in
accordance with a control signal from the CPU 16, multiplies the waveform data by an envelope,
and generates and outputs a digital musical tone signal MS. Although the tone generator circuit
19 actually outputs two musical tone signals for the left and right channels, for convenience of
illustration, only one is shown in FIG. The musical tone signal MS is supplied with various
acoustic effects and the like by a DSP (digital signal processor) 21 and is converted into an
analog signal by a D / A (digital / analog converter) 22 and sent to the reproduction unit 57. Be
[0005]
As shown in FIG. 7, in the reproduction unit 57, the analog tone signal MS is amplified by the
main amplifier 58 and branched into three. One branched tone signal MS has a high frequency
component taken out by a capacitor 59, and is reproduced by the high-pitched speaker 55 and
emitted. In addition, one other tone signal MS has its medium frequency component taken out by
the condenser 60 and the coil 61, and is reproduced by the above-mentioned medium sound
speaker 54 and emitted. Further, the remaining one tone signal MS has its low frequency
component taken out by the coil 62, and is reproduced by the bass speaker 53 and emitted.
[0006]
However, in the above-described speaker device 52 of the conventional electronic piano 51, one
musical tone signal MS is output for each of the left and right channels, and the low frequency
component thereof is output by the single bass speaker 53. There is a problem that the bass can
not be reproduced well depending on the volume of the electronic piano 51 because the
reproduction is performed. That is, when a relatively large speaker is used as the bass speaker
53, there is an advantage that a powerful reproduced sound can be obtained at a large volume,
but since the response of the diaphragm is not high, There is a problem that the playback volume
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of the bass is insufficient and the sharpness and the clarity are lacking. On the other hand, when
a small speaker is used as the bass speaker 53, the above-mentioned problems can be solved
because the response of the diaphragm is high, while the amplitude of the diaphragm increases
to near its limit at high volume. Therefore, it is impossible to obtain a powerful playback sound.
[0007]
The present invention has been made to solve such problems. By appropriately performing bass
reproduction according to the set volume at that time, sharp and clear reproduction sounds can
be obtained at low volume, and It is an object of the present invention to provide an electronic
musical instrument bass reproduction device capable of obtaining powerful reproduced sound at
high volume.
[0008]
SUMMARY OF THE INVENTION In order to achieve the above object, a bass reproducing
apparatus of an electronic musical instrument according to the present invention comprises: a
musical tone generating section for generating and outputting first and second musical tone
signals; A volume setting means for setting a volume, and an output level of the first tone signal
are determined so that the value when the volume is low set by the volume setting means is
larger than the value when the volume is high. Output level determining means for determining
the output level of the second musical tone signal so that the value when the volume is large is
larger than the value when the volume is smaller, and the first musical tone signal output from
the musical tone generating unit A small-sized speaker capable of reproducing the low-frequency
component of the low-frequency component, and a large bass speaker having a larger aperture
than the small-sized speaker and reproducing the low-frequency component of the second
musical tone signal output from the musical tone generating unit. It is characterized in that.
[0009]
According to the bass reproduction apparatus of the electronic musical instrument, the musical
tone generation unit generates and outputs the first and second musical tone signals independent
of each other, and the low frequency component of the first musical tone signal is reproduced by
the small speaker. The low frequency component of the musical tone signal is reproduced by the
large bass speaker.
Further, the output level determination means sets the output level of the first musical tone
signal to a larger value and the output level of the second musical tone signal more when the set
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volume set by the volume setting means is small, that is, when the small volume is set. Decide
each to a small value.
Therefore, when the volume is small, the ratio of the output level of the first tone signal to the
output level of the second tone signal is high, and the low frequency component is mainly
reproduced by a small-sized speaker with high responsiveness. Sound can be obtained.
[0010]
Conversely, when the set volume is large, ie, when the volume is large, the output level
determining means determines the output level of the first musical tone signal to a smaller value
and the output level of the second musical tone signal to a larger value. Since the ratio of the
output level of the second tone signal becomes high and the low frequency component thereof is
mainly reproduced by the large bass speaker, a powerful reproduced sound can be obtained.
[0011]
In this case, it is preferable that the output level determination means gradually reduce the
output level of the first tone signal and gradually increase the output level of the second tone
signal as the volume increases.
[0012]
According to this configuration, as the output levels of the first and second tone signals are
gradually increased or gradually reduced with the change of the set volume, the ratio of both is
also gradually increased or gradually reduced.
Therefore, the ratio of the tone signal reproduced by the small speaker and the large bass
speaker can be appropriately set according to the set volume, and can be smoothly changed
without any step.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the present
invention will be described in detail below with reference to FIGS.
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In the following description, the same reference numerals will be used for components having
the same configurations and functions as the conventional components shown in FIG.
[0014]
FIG. 4 shows an exterior and a speaker device of an electronic piano to which the present
invention is applied. As shown in the figure, the speaker device 2 of the electronic piano 1 is
composed of a pair of left and right low-pitched small speakers 3 and 3 (small-sized speakers),
mid-tone speakers 4 and 4 and high-pitch speakers 5 and 5 respectively. It has a way speaker
system. In addition to this, the speaker device 2 is provided with one large bass speaker 6 for
bass.
[0015]
These speakers 3 to 6 are of the usual type having a diaphragm. Among them, the small-sized
bass speaker 3 is mainly used for bass reproduction at a small volume as described later, and as
apparent from the comparison with FIG. It has a small caliber. The large bass speaker 6 is mainly
used for bass reproduction at high volume, and has a considerably larger aperture than the small
bass loudspeaker 3.
[0016]
The small-sized bass speakers 3, 3 are released in the left and right speaker boxes 7b, 7b
separated by the dividers 7a, 7a, and the large-sized bass speaker 6 is released in the middle
speaker box 7c between the dividers 7a, 7a. It is housed with the sound front facing forward. In
addition, the high-pitched speakers 5 are disposed above the low-pitched speakers 3, and the
mid-tone speakers 4 are disposed on the inner side thereof. In addition, the code | symbols 8 and
8 of the same figure are the jersey nets provided so that those front sides might be covered, for
protection and the decoration of the speakers 3-6.
[0017]
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FIG. 1 shows a circuit configuration for controlling the sound generation of the electronic piano
1. First, reference numeral 9 in the same figure is a volume circuit (VOL) as volume setting
means for setting the volume of the electronic piano 1, and an analog signal representing the set
volume VOL from the volume circuit 9 is A / D (analog (Digital converter) 10 after being
converted into a digital signal, it is sent to the CPU 16.
[0018]
The operation panel 11 is provided with various switches (not shown) such as a power switch
and a tone color selection switch, and a display (not shown) for displaying the operation state
thereof. The operation states of these switches are detected by the panel scan circuit 12 and sent
to the CPU 16 via the system bus 15 as panel switch data. Further, the keyboard 13 is composed
of a plurality of keys and a plurality of keyboard switches (not shown) which are opened and
closed by pressing and releasing the keys. The on / off state of the keyboard switch is detected
by the keyboard scan circuit 14 and touch data representing the on / off information, note
number, and velocity from the keyboard scan circuit 14 via the system bus 15 as the key
depression information is the CPU 16 Sent to
[0019]
In addition, the RAM 17 temporarily stores status information and the like indicating the
operation state of the electronic piano 1 and is used as a work area of the CPU 16. The ROM 18
stores a control program to be executed by the CPU 16, fixed data to be used for calculation by
the CPU 16, a table including an output level determination table to be described later, and the
like. The RAM 17 and the ROM 18 are accessed by the CPU 16 via the system bus 15.
[0020]
The CPU 16 controls each part of the electronic piano 1, and responds to panel switch data from
the panel scan circuit 12, key depression information from the keyboard scan circuit 14, and
further to a set volume VOL from the volume circuit 9, etc. The contents of the tone to be
generated are calculated according to the control program, and a control signal based on the
calculation result is output to the tone source circuit 19 (tone generation unit). In this
embodiment, the tone generator circuit 19 is configured to output the first and second musical
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tone signals MS1 and MS2 in two independent output systems for each of the left and right
channels, and the CPU 16 outputs As determination means, output levels OL1 and OL2 of the
first and second musical tone signals MS1 and MS2 are determined as follows. For convenience
of illustration, FIG. 1 shows only one output system of the left and right channels.
[0021]
FIG. 3 shows an example of an output level determination table (output level determination
means) used to determine the output levels of the first and second musical tone signals, and this
table is stored in the ROM 18. That is, in this output level determination table, the output levels
OL1 and OL2 of the first and second musical tone signals are set in accordance with the set
volume VOL. More specifically, as shown in FIG. 6A, the output level OL1 of the first tone signal
is set to the maximum value OL1max when the set volume VOL is the minimum value VOLmin,
and the set volume VOL increases. As the set volume VOL gradually decreases, the minimum
value OL1 min is set when the set volume VOL is the maximum value VOLmax.
[0022]
On the other hand, the output level OL2 of the second musical tone signal is set to the minimum
value OL2min, for example, the value zero, in the reverse of the above, that is, when the set
volume VOL is the minimum value VOLmin, as shown in FIG. As the set volume VOL increases, it
increases linearly, and is set to reach the maximum value OL2max when the set volume VOL is at
the maximum value VOLmax. The CPU 16 reads out and determines the output levels OL1 and
OL2 of the first and second musical tone signals according to the set volume VOL from the
output level determination table set as described above, and controls the control signal including
them. Output to 19.
[0023]
The tone generator circuit 19 reads waveform data from the waveform memory 20 in
accordance with a control signal from the CPU 16, multiplies the waveform data by the envelope,
and generates and outputs digital first and second musical tone signals MS1 and MS2. The tone
signals MS1 and MS2 are subjected to addition of sound effects such as reverberation and chorus
by the DSP 21 and filter processing, converted to analog signals by the D / A 22 and 22, and
then to the first reproduction unit 23 and the second reproduction unit 23. It is sent to the
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reproduction unit 24 respectively.
[0024]
As shown in FIG. 2A, in the first reproduction unit 23, processing similar to that of the
reproduction unit 57 in FIG. 7 is performed. That is, the analog first tone signal MS1 is amplified
by the main amplifier 25 and branched into three. One branched tone signal MS1 has a high
frequency component taken out by a capacitor 26, and is reproduced by the high-tone speaker 5
and emitted. The other one tone signal MS1 has its medium frequency component taken out by
the capacitor 27 and the coil 28, and is then reproduced by the mid-sound speaker 4 and
emitted. Further, the remaining one tone signal MS1 has its low frequency component taken out
by the coil 29, and is reproduced by the above-mentioned small-sized bass speaker 3, and
emitted.
[0025]
On the other hand, in the second reproduction unit 24, as shown in FIG. 2B, after the low
frequency component of the second musical tone signal MS2 is taken out by the low pass filter
30, and amplified by the main amplifier 31, It is reproduced by the large speaker 6 and emitted.
Note that the low pass filter 30 may be omitted and the filtering of the second musical tone
signal MS2 may be performed by the DSP 21.
[0026]
As described above, according to the present embodiment, the tone generator circuit 19
generates and outputs the first and second musical tone signals MS1 and MS2 independent of
each other, and the low frequency component of the first musical tone signal MS1 is small for
bass The low frequency component of the second musical tone signal MS 2 is reproduced by the
speaker 3 and reproduced by the large bass speaker 6. The output levels OL1 and OL2 of the
first and second musical tone signals MS1 and MS2 are determined by the output level
determination table and the CPU 16 so as to gradually decrease and increase as the set volume
VOL increases.
[0027]
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Therefore, when the set volume VOL is small, that is, when the volume is small, the ratio of the
output level MS1 of the first tone signal MS1 to the output level OL2 of the second tone signal
MS2 becomes high, and its low frequency component is mainly responsive. Since the highpitched small-sized speaker 3 reproduces, it is possible to obtain a sharp and clear reproduced
sound. In this case, by setting the minimum value OL2min of the second tone signal OL2 when
the set volume VOL is the minimum value VOLmin to a value of zero, bass reproduction at this
time can be performed only by the small speaker 3 for bass, Thereby, a sharper and clearer
reproduced sound can be obtained.
[0028]
Conversely, when the set volume VOL is large, that is, when the volume is large, the ratio of the
output level MS2 of the second musical tone signal MS2 to the output level OL1 of the first
musical tone signal MS1 is high, and its low frequency component is mainly for bass Since the
sound is reproduced by the large speaker 6, a powerful reproduced sound can be obtained.
[0029]
Further, with the change of the set volume VOL, the output levels OL1 and OL2 of the first and
second musical tone signals MS1 and MS2 gradually increase or decrease, so that the ratio
between them also gradually increases or gradually decreases.
Therefore, the ratio of the musical tone signal reproduced by the small-sized bass speaker 3 and
the large-sized bass speaker 6 can be appropriately set according to the set volume VOL, and can
be smoothly changed without any step.
[0030]
FIG. 5 partially shows a circuit configuration of a bass reproduction apparatus according to a
second embodiment of the present invention. That is, while the tone generator circuit 19
generates and outputs the first and second two tone signals MS1 and MS2 in the above-described
first embodiment, the tone generator circuit 19 generates one tone system from the tone
generator circuit 19. While generating and outputting only the signal MS, this musical tone signal
MS is branched into two musical tone signals MS1 and MS2 in the DSP 21 and the values of their
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output levels OL1 and OL2 are set as in the first embodiment. After control according to the
volume VOL, it is outputted to the D / A 22. The other configuration is the same as that of the
first embodiment. The contents of the first and second musical tone signals MS1 and MS2 may
be the same as each other, and the output levels OL1 and OL2 may be different. Similar effects
can be obtained.
[0031]
In addition, this invention can be implemented in various aspects, without being limited to the
described embodiment. For example, in the embodiment described above, the output levels OL1
and OL2 of the first and second musical tone signals MS1 and MS2 are set to be gradually
increased or gradually reduced according to the change of the set volume VOL. You may set OL2
in steps. Further, in the embodiment, as a speaker system for reproducing the first musical tone
signal MS1, a 3-way system consisting of small bass speakers 3 and middle / high-tone speakers
4 and 5 is adopted. As long as it has an aperture smaller than the speaker 6, instead of this, a
two-way speaker system or one full-range speaker may be adopted.
[0032]
Furthermore, the embodiment is an example in which the present invention is applied to an
electronic piano, but the present invention is not limited to this, and it is needless to say that the
present invention can be applied to other suitable electronic musical instruments such as
synthesizers and electronic organs. is there. In addition, the configuration of the details can be
appropriately changed within the scope of the present invention.
[0033]
As described above in detail, the bass reproduction apparatus of the electronic musical
instrument according to the present invention appropriately reproduces the bass according to
the set volume at that time, so that a sharp and clear reproduction sound can be obtained at a
small volume. As well as being obtained, it has an effect of being able to obtain a powerful
reproduced sound at high volume.
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