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The present invention relates to a playing sound pickup device for capturing natural sounds of
acoustic musical instruments such as guitars and pianos and faithfully converting them into
electric signals. [In general, musical instruments having acoustical sound such as cofolk guitars
and classical guitars are generally low in volume. For this reason, when playing in a large hall,
the microphone must be placed close to the sound hall to spread the sound and increase the
output of the amplifier, but then the sound of the venue and the sound of the monitor speaker
are re-input to the microphone to cause howling. It will be easier. Therefore, howling is
conventionally caused. For that purpose, the sound of the frequency to be feedback was cut by
graphic equalizer and parametric equalizer etc. to prevent this, but like this; cut the specific
frequency band or modify the original timbre of the original instrument There was a problem
that I could not do it faithfully. [Purpose of the invention] Therefore, the present invention cuts
the distorted sound which is not desired to be spread out as an electric signal from the musical
performance sound of the musical instrument, and makes it possible to input only the faithful
performance musical performance of the musical instrument to the amplifier. It is an attempt to
provide a device. [Means for achieving the object] In order to achieve the object, the present
invention is mainly set to catch the distortion sound derived from the main microphone, which is
mainly set to capture the performance sound of the instrument and the main sound. The sub
microphone, ratio adjustment means capable of adjusting the voltage of the distorted sound
captured by the main microphone and the voltage of the distorted sound captured by the sub
microphone to substantially the same level, and both microphones adjusted to the same level The
circuit is composed of a circuit for subtracting the output voltage, and unnecessary distortion
sound can be eliminated by passing through the circuit. FIG. 1 is a block diagram of the playing
sound pickup device according to the present invention, and the output of the subtracting circuit
is input to an amplifier and amplified, and is sent to a playing hall site from a speaker (not
shown) or recorded. FIG. 2 shows a preferred arrangement example of the main microphone 1
and the sub microphone 2 in the case of a fork guitar. Various types of main microphones 1 and
sub microphones 2 can be used, but in this case, uni-directional electret condenser microphones
are used. Thus, when setting both microphones 2 in the body portion 3 of the fork
guitar, the main microphone 1 is fixed upward (during playing) near the sound hole 5 on the
back surface of the front plate, The microphone 2 fixes the V-shaped mounting bracket 6 to the
back of the front plate 4 on the opposite side of the main microphone 1 across the sound hole 5
and fixes the mounting bracket d to the back of the guitar drum.
In this manner, the sub microphone 2 is set to point obliquely downward through the sound hole
5. In addition, 7 shows a guitar string. The inventor changed the setting positions of the two
microphones 1 and 2 in various ways to search for the optimum position, but the main
microphone 1 is the front plate 4 below the sound hole 5 as shown in this embodiment. By fixing
it on the back side parallel to the front plate 4 and facing upward, it was possible to most
faithfully capture the comfortable raw sound of the folk guitar. Further, by providing the sub
microphones 2 obliquely downward on the upper side of the sound hole 5, distorted sound which
is hazy due to resonance in the body can be caught better than the main microphone. In addition,
since the sub microphone 2 is directed to the direction of the monitor speaker which is usually
directed to the performer on the stage when playing on the stage, in addition to the abovementioned distorted sound, distorted sound emitted from the monitor speaker is also better than
the main microphone. I was able to catch it. A specific example of the electric circuit of this
pickup device is shown in FIG. 3, in which 8 is a battery for activating the main microphone 1
and the sub microphone 2, 9 is a switch thereof, and 10 is a battery checker provided in parallel
with the battery 8. It is. A variable resistor 11 adjusts the output voltage level of the main
microphone 1, and a variable resistor 12 adjusts the output voltage level of the sub microphone
2. Reference numeral 13 denotes a transformer whose variable resistor 11.12 is connected to its
primary side, and 14 denotes an output jack connected to the secondary side of the transformer.
The variable resistor 11.12 is adjusted so that the voltage of the distorted sound captured by the
main microphone l and the voltage of the distorted sound captured by the sub microphone 2
become substantially the same level. That is, since the original sub microphone 2 is set so that
resonance inside the guitar and derivative distortion sounds such as monitor speakers can be
captured better than the main microphone 1, in this case, the output voltage level of the sub
microphone 2 is narrowed to set both microphones. The sound pressure level of the distorted
sound component of is adjusted to be approximately the same. Then, since the transformer 13 is
excited by the voltage difference of its surface output, the distortion sound component of the
secondary side of the transformer 14 becomes zero due to the nature of the transformer, and the
musical sound captured by the main microphone 1 near the string and the sub Only the
difference between the playing sounds captured by the microphone 2 is output, and the distorted
sound is completely cut. For this reason, the musical instrument sound is faithfully converted into
an electric signal.
In this embodiment, the voltage ratio adjustment of both microphones is adjusted by a variable
resistor, and a transformer is interposed to output. However, the present invention does not
necessarily adopt such a wiring form, for example, instead of 1 Herance. In other words, an
operational amplifier may be used, and in short, two or more microphones are used to place the
microphones in a part where distortion sound is easy to catch and a part where it is difficult to
catch, adjust distortion sound levels of those microphones and subtract The distortion sound can
be cut substantially by this. Also, although the above description has been given taking the
example of the folk guitar as an example, other acoustic instruments can be put into practical use
as well, and since the sound is small in the past, these have been insufficient for the audience
compared to electric instruments such as electric guitars and synthesizers. Can improve the
shortcomings of [Effects of the Invention] Eliminate secondary distortion sounds such as
howlings derived from the sound played by acoustic musical instruments and create a sound that
meets only the primary sound, that is, the first sound that is produced and meets the player's
wish To be possible.
Brief description of the drawings
FIG. 1 is a block diagram of a playing sound pickup device for an acoustic musical instrument
according to the present invention, FIG. 2 is a cross-sectional view showing the arrangement of
microphones in the embodiment of a fork guitar, and FIG. is there.
1 ... main microphone, 2 ... sub microphone, 11.12 ... variable resistor, 13 ... transformer.
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