JP2002108338

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DESCRIPTION JP2002108338
[0001]
The present invention relates to an effect device for an electronic musical instrument such as an
electronic piano, an electronic organ, a single keyboard, etc. In particular, the headphone, the
speaker and the line out are good depending on the connection condition of the headphone and
the speaker. TECHNICAL FIELD The present invention relates to an electronic musical instrument
effect device capable of outputting a music signal having a high sound quality.
[0002]
2. Description of the Related Art Some conventional electronic musical instruments have a
headphone jack for outputting musical tone signals. The headphone jack has a switch unit, and
the switch unit generates a relay control signal for turning on / off a relay connected to a main
body speaker of the electronic musical instrument. The relay functions to turn on / off the supply
of the musical tone signal output from the electronic musical instrument to the main body
speaker, and when the headphone is plugged into the headphone jack, the relay control signal is
grounded. And turn off the relay. Therefore, the main body speaker is not connected to the
electronic musical instrument, and the main body speaker is in the mute (silence) state.
[0003]
On the other hand, the operation panel of the electronic musical instrument is provided with an
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EQ (Equalizer) switch for adjusting the sound quality according to the environment in which the
electronic musical instrument is installed. When the EQ switch is turned on, the electrical
characteristics set for the main body speaker are set in a digital signal processor (DSP) of the
electronic musical instrument and added to the musical tone. Therefore, when the EQ switch is
turned on and the musical tone signal is connected to the main body speaker, the main body
speaker can output the music signal of the sound quality most suitable for the environment in
which the electronic musical instrument is installed. .
[0004]
For example, when an electronic musical instrument is placed near a wall and played, the bass
will be emphasized compared to when the electronic musical instrument is played in the middle
of a large room, but the EQ switch When is turned on, the difference in sound quality between
the two can be corrected, and the optimum sound quality can always be obtained regardless of
the installation environment.
[0005]
As described above, when headphones are inserted into the headphone jack, the main body
speaker is automatically muted, and music signals are output from the headphones. When the EQ
switch is turned on, there is a problem that headphone reproduction is adversely affected.
The reason is that the EQ switch works to produce the effect of optimizing the sound quality
during reproduction by the main body speaker, and does not optimize the sound quality during
headphone reproduction.
[0006]
The present invention has been made to solve the above-mentioned problems of the prior art,
and its object is to put the headphone into the headphone jack and output the music signal from
the headphone. It is an object of the present invention to provide an output control device of an
electronic musical instrument that prevents the occurrence of the problem. Another object of the
present invention is an output control device of an electronic musical instrument capable of
supplying a music signal of good sound quality to any of a headphone, a main body speaker and
an external speaker for an electronic musical instrument having a line out jack. To provide.
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[0007]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention
adjusts the sound quality of sound reproduced from a main body speaker in an effect device of
an electronic musical instrument including at least a headphone jack and a main body speaker. A
sound quality adjustment switch (EQ switch) and detection means for automatically detecting
that the headphone plug is inserted when the headphone plug is inserted into the headphone
jack, the detection means detects the headphone jack A first feature is that the function of the
sound quality adjustment switch is disabled when it is detected that a headphone plug has been
inserted.
[0008]
According to this feature, when the headphone plug is inserted into the headphone jack, the
function of the sound quality adjustment switch is invalidated, so that the function of the sound
quality adjustment switch can be completely prevented from working at the time of headphone
reproduction. Sound quality at the time of reproduction can be improved.
[0009]
Further, according to the present invention, when a headphone plug is inserted into the
headphone jack, detection means for detecting that the headphone plug is inserted, and whether
or not the headphone plug is inserted into the headphone jack by the detection means And an
effect setting SW in which a function to be set is determined, and when it is determined that the
headphone plug is not inserted into the headphone jack by the detection means, the effect setting
SW has a function of speaker system effect setting. A second feature is that, when it is
determined that a headphone plug is inserted into the headphone jack, the effect setting SW is
provided with a headphone effect setting function.
[0010]
According to this feature, when the headphone plug is not inserted into the headphone jack, the
effect setting SW is given the function of the speaker system effect setting, and when the
headphone plug is inserted, the effect setting SW is the headphone effect setting Therefore,
regardless of whether or not a headphone plug is inserted into the headphone jack, it is possible
to automatically obtain the best sound quality.
[0011]
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Furthermore, according to the present invention, it further comprises a line out jack and
detection means for detecting that a plug is inserted in the line out jack, and the plug is inserted
in the line out jack by the detection means. The third feature is that when it is determined that
the effect setting SW is provided with the function of external speaker effect setting.
According to this feature, when the plug is inserted into the line out jack, the sound quality
uttered by the external speaker becomes good.
[0012]
DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail
below with reference to the drawings.
FIG. 1 is a block diagram showing the configuration of an embodiment of an electronic musical
instrument (for example, an electronic piano) of the present invention.
In the figure, a central processing unit (CPU) 1 controls the operation of each unit of the
electronic musical instrument in accordance with a control program stored in a program memory
unit of a ROM 2.
The ROM 2 stores a program for controlling the operation of the entire electronic musical
instrument, various fixed data used by the CPU 1, and the like. These programs and fixed data
are accessed by CPU 1 via system bus SB. The RAM 3 stores device status information and is
used as a work area of the CPU 1. Note that various registers for controlling the electronic
musical instrument, flags, and the like are defined in the RAM 3, and the RAM 3 is accessed by
the CPU 1 via the system bus SB.
[0013]
The operation panel 5 has various switches such as a power switch, a tone color selection switch,
an EQ switch, and a display for displaying predetermined information. The panel scan circuit 4
checks the set / reset state of each switch provided on the operation panel 5, detects panel
switch data in the on state, and sends it to the CPU 1.
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[0014]
The keyboard 7 is composed of a plurality of keyboards and keyboard switches that open and
close in conjunction with key depression and key release. The keyboard scan circuit 6 checks the
state of the keyboard switch and generates touch data indicating the intensity (speed) of the
keyboard touch from the signal indicating the on / off, and the on / off information and the
keyboard number ( Output number). The on / off information, the keyboard number, and the
touch data are sent to the CPU 1 via the system bus SB.
[0015]
The sound source circuit 8 reads original sound waveform data corresponding to a signal output
from the CPU 1 from the original sound waveform memory 9, multiplies the original sound
waveform data by an envelope, and outputs it to a DSP (digital signal processor) 10 as a musical
tone signal. The DSP 10 incorporates a frequency characteristic adjustment circuit 10a and an
effect circuit 10b. The frequency characteristic adjusting circuit 10a can realize frequency
characteristics that can output optimum sound quality to each of headphone listening, sound
generation by the main body speaker, and sound generation by the external speaker. Further, in
the effect circuit 10b, various effects such as reverb and chorus can be generated. The tone
signal output from the DSP 10 is converted to an analog signal by the D / A converter 11 and
transmitted to the main amplifiers 12L and 12R and the headphone amplifiers 20L and 20R.
[0016]
The audio signals amplified by the main amplifiers 12L and 12R are transmitted to the speaker
system including the high-pitched speakers 14a and 15a and the low-pitched speakers 14b and
15b through the relays 13L and 13R, respectively, and reproduced. A signal for controlling the
relays 13L and 13R is supplied from the CPU 1 through the relay control line 13a. On the other
hand, the audio signal amplified by the headphone amplifiers 20 L and 20 R is sent to the
headphone jack 23.
[0017]
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FIG. 2 is a circuit diagram showing a specific example of the headphone jack 23. The headphone
jack 23 includes a jack 31 and a jack built-in switch 32. A signal line 23a extending from the jack
built-in switch 32 to the CPU 1 is pulled up. Now, when a plug is inserted into the jack 31 of the
headphone jack 23, the jack built-in switch 32 is opened, and an L level signal is input to the CPU
1. On the other hand, when the plug is removed from the jack 31, the jack built-in switch 32 is
closed, and an H level signal is input to the CPU 1. As a result, the CPU 1 can detect whether a
plug is inserted in the headphone jack 23 or not.
[0018]
FIG. 3 is a view showing a specific example of a control circuit of the relays 13L and 13R. The
control circuit comprises a resistor 41, an NPN transistor 42 whose base is connected to the
resistor 41, a coil 43 and a diode 44 connected to the collector of the transistor 42. Now, when a
control signal at H level is input from the port 1 c of the CPU 1, the transistor 42 is turned on,
and a current flows in the coil 43. As a result, the relays 13L and 13R are turned on, and the tone
signals are supplied to the speakers 14 and 15. Conversely, when the control signal of L level is
input from the CPU 1, the transistor 42 is turned off and current does not flow in the coil 43.
Therefore, the relays 13L and 13R are turned off, and the tone signals are not supplied to the
main body speakers 14 and 15.
[0019]
Next, the operation of the present embodiment will be described with reference to FIGS. FIG. 4 is
a flowchart showing the operation of the CPU 1 according to the present invention.
[0020]
In step S1, it is determined whether or not headphones are connected to the headphone jack 23.
This determination can be made by checking the level of the signal input to the input port 1a by
the CPU 1. That is, when the level of the signal is L (low) level, it is determined that the
headphone is connected to the headphone jack 23. Conversely, if the H (high) level, it is
determined that the headphones are not plugged into the headphone jack 23.
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[0021]
If the determination in step S1 is affirmative, the process proceeds to step S2. In step S2, it is
determined whether the EQ switch is turned on. If the determination is affirmative, the process
proceeds to step S3, in which the operation of the EQ switch is invalidated, and the DSP 10 is set
to an optimal state at the time of headphone listening. As a result, in the DSP 10, a spreading
circuit for headphones and a frequency characteristic adjusting circuit for headphones are set,
and an optimal state is created at the time of headphone listening.
[0022]
On the other hand, if the determination in step S1 is negative, the process proceeds to step S4, in
which it is determined whether the EQ switch is turned on. If the EQ switch is turned on, the
process proceeds to step S5, and the operation of the EQ switch is enabled. As a result, it
becomes possible to output, from the main body speaker, a music signal of the sound quality
most suitable for the environment in which the electronic musical instrument is installed, as in
the prior art. If the determination in step S4 is negative, the process ends.
[0023]
As a result of the above, in the present embodiment, even if the EQ switch is turned on in
advance, the operation of the EQ switch is automatically invalidated when headphones are
inserted in the headphone jack, so the operator can use the headphones in the headphone jack.
After plugging, it is possible to create an optimal condition for listening to headphones without
having to turn off the EQ switch.
[0024]
Next, a second embodiment of the present invention will be described with reference to FIG.
In this embodiment, the line out jacks 21L and 21R and the headphone jack 23 are connected to
the headphone amplifiers 20L and 20R. A signal line 21a is connected to the CPU 1 from the line
out jacks 21L and 21R, and a line out detection signal is supplied through the signal line 21a.
The line out jacks 21L and 21R may have the same structure as, for example, the headphone jack
23 shown in FIG. 2, and the CPU 1 is at L level when the plug is inserted into the line out jacks
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21L and 21R, and H if it is not inserted. Detect the level signal. Further, on the operation panel 5,
an effect setting switch (hereinafter referred to as an effect setting SW) according to the present
invention is provided. The effect setting SW may be a single on / off switch or, like a rotary
switch, one of a plurality of options. The same reference numerals in FIG. 5 as those in FIG. 1
indicate the same or similar ones.
[0025]
In the present embodiment, the CPU 1 operates in accordance with the operation table of FIG.
Now, if a headphone plug is inserted into the headphone jack 23 and no plug is inserted into the
line out jacks 21L and 21R, an L level signal is input to the input port 1a of the CPU 1, and an H
level is input to the input port 1b. Signal is input. Then, the CPU 1 adds the function of the
headphone effect setting SW to the effect setting SW according to the operation table of FIG.
Therefore, the effect setting SW functions as a headphone effect setting SW, and by operating the
effect setting SW, it is possible to select settings of the headphone spreading circuit, the
frequency characteristic adjustment circuit, etc. .
[0026]
Headphones are commercially available in various types of sound quality, such as high treble,
weak, strong bass, weak, strong midrange, and weak. Therefore, the correction electrical
characteristics are set in advance in the DSP 10 so as to provide sound quality to which these
headphones can be connected, and the electric characteristics can be selected by the effect
setting SW. When the optimum electrical characteristics are selected by the effect setting SW, the
optimum sound quality can be obtained even using the headphones having the above-mentioned
features. In addition, listening to the sound with headphones, the sound is localized in the head,
and there is a problem that if you continue listening for a long time, you get tired. In such a case,
selecting the headphone spreading circuit can reduce or eliminate this problem.
[0027]
These settings can be realized by the CPU 1 mainly by switching the frequency characteristic
adjusting circuit programmed in the DSP 10, the program for the effect such as the spread for
headphones, the reverb, the chorus, or these parameters. The same applies to the following.
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[0028]
Next, when the CPU 1 detects that the signal of the input port 1a is H level and the signal of the
input port 1b is L level, the CPU 1 performs the function of line out effect setting SW in the effect
setting SW according to the operation table of FIG. Grant
[0029]
The line out terminal is generally connected to an external speaker or PA of a stage.
At such times, flat characteristics are generally desired. Therefore, when it is determined that the
line out jack is selected, the flat electric characteristic is set when the effect setting SW is
operated.
[0030]
Further, other effects supposing external speakers may be selectively set. For example, an effect
for a large speaker, an effect for a small speaker, an output level setting effect, or the like may be
selected. That is, when a large-sized speaker is connected as an external speaker, the bass may be
excessive and the balance may be deteriorated. The large speaker effect provides electrical
characteristics with reduced bass levels to eliminate this problem. On the other hand, when a
small-sized speaker is connected as an external speaker, the balance may be deteriorated due to
too high sound. The small speaker effect provides electrical characteristics with a reduced level
of treble to eliminate this problem. Furthermore, the output level setting effect provides electrical
characteristics that can change the output level of the unit in accordance with the other device
connected to the line out terminal.
[0031]
Furthermore, when the CPU 1 detects that both the signals at the input ports 1a and 1b are at
the H level, the CPU 1 adds the function of the speaker system effect setting SW to the effect
setting SW according to the operation table of FIG. Therefore, the effect setting SW functions as a
speaker system effect setting SW, and by operating the effect setting SW, the setting of the
speaker spreading circuit, the frequency characteristic adjusting circuit, etc. can be selected.
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Become.
[0032]
In addition, other effects may be selectively set assuming the setting position of the electronic
musical instrument. For example, if the electronic piano is placed near a wall, the electric
characteristics with reduced bass level, or the room with high reflection, the room with low
reflection, the corrected electric characteristics according to a large room, a narrow room etc.
With the effect setting SW, it is possible to select their electrical characteristics. Then, for
example, when the electronic piano is placed by the wall and played, a sound whose bass is
suppressed is output, and the musician can hear music with a good sound quality. When the
signals of the input ports 1a and 1b are both L level, priority is given to the headphones, and it is
determined that the headphones are selected.
[0033]
As described above, various electrical characteristics can be set to the effect setting SW, but the
settings of the various electrical characteristics may be automatically stored. That is, when using
the speaker, the effect set at that time is set first. When headphones are used and line-outs are
used, the effects set by the player are set first. In this way, the effect of each output sequence
according to the preference of the player (user) is automatically set according to the selected
output sequence.
[0034]
In the second embodiment, three output sequences are determined, but the determination of the
output sequence of the lineout with low frequency of use is omitted, and only the output
sequence of the headphone and the speaker is determined. May be In this way, one input port of
the CPU 1 can be saved, and the line-out jack can be used without a switch device, and the cost
can be reduced.
[0035]
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Note that the effect setting may be performed by entering the system mode without specially
providing the single on / off switch or the rotary switch as the effect setting switch. At this time,
the setting contents of the effect can be backed up to a memory, and the contents are put into an
external storage medium such as a floppy disk and stored, and are read out together with EQ
characteristics, timbre editing, and created performance data etc. It can also be one of the
parameters that form the personality of the individual performer.
[0036]
As described above, according to the present embodiment, one switch (that is, the effect setting
SW) performs a function corresponding to three modes (speaker reproduction mode, headphone
reproduction mode, and line out reproduction mode). . Also, this makes it possible to reduce the
number of switches.
[0037]
FIG. 7 is a system diagram of an electronic piano and an external speaker suitable for applying
the present invention. As well known, the electronic piano has a keyboard 51 and an operation
panel 52, and a headphone jack 23 is provided on part of the front of the electronic piano.
Further, an EQ switch 31 and an effect setting switch 32 are installed in part of the operation
panel 52, and main body speakers 14 and 15 are arranged on the upper surface of the electronic
piano. Furthermore, line-out jacks 21L and 21R are provided on a part of the rear surface of the
electronic piano, the audio amplifier 53 is connected to the line-out jacks 21L and 21R via an
audio cable 55, and two external speakers 54a and 54b. Is connected.
[0038]
As described above, according to the present embodiment, it is possible to use the electronic
musical instrument with the optimum setting without performing any complicated operation,
regardless of which output system the player uses.
[0039]
As is apparent from the above description, according to the present invention, the best sound
quality in each situation is obtained depending on the insertion situation of the headphone plug
in the headphone jack or the insertion situation of the plug in the line out jack. Will be able to
offer.
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[0040]
That is, according to the invention of claim 1, when the headphone plug is inserted into the
headphone jack, the function of the sound quality adjustment switch is invalidated, and therefore
the influence of the sound quality adjustment switch is completely eliminated during headphone
listening. It becomes possible to provide good tone quality tones.
[0041]
Further, according to the invention of claims 2 to 4, when the headphone plug is not inserted into
the headphone jack, the effect setting SW is given the function of the speaker system effect
setting, so when this is operated, the main body speaker sound Is the best, and when inserted, the
effect setting SW is given the function of setting the headphone effect, so the headphone
listening sound is the best.
[0042]
Further, according to the present invention, when the plug is inserted into the line out jack, the
effect setting SW is provided with the function of external speaker effect setting, so that when
the plug is operated, the external speaker is operated. Will be able to provide a flat good sound
quality.
[0043]
Furthermore, according to the seventh aspect of the present invention, at least one of the speaker
system effect setting, the headphone effect setting, and the external speaker effect setting can be
set to the electrical characteristic according to the preference of the user.
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