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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
pickup of a stringed instrument and a stringed instrument equipped with the same.
2. Description of the Related Art In conventional pickups for stringed instruments, magnets and
coils are embedded in the instrument main body and chrome strings themselves are used as
diaphragms to convert them directly into electrical signals, or piezo electrodes are fixed to a
piece. There are some that pick up the vibration of the piece, and sometimes, it was attached to
the outside of the musical instrument by diverting a contact microphone for wind instrument and
made it in time.
In the conventional pickup for a stringed instrument, for example, in the system in which the
vibration of the chrome string is directly converted by the magnet coil, the sound quality is
completely different from that of the natural natural sound, and in general The gut strings, which
are considered to have better sound quality than chrome strings, can not be used, the mounting
position of the pickup is severe, and removal is also difficult.
On the other hand, in the case where the piezo electrode is closely fixed to the piece and the
vibration of the piece is captured, sufficient acoustic sensation can not be obtained because the
sound quality of the vibration of the piece is not good, and the vibration propagation from the
string to the resonance cylinder is inhibited. Also, in the method of using a wind instrument
contact microphone and attaching it to the outside of a stringed instrument, there is a problem
that it is easy to cause howling and a large volume can not be obtained, and it is easy to pick up
other musical instruments around.
[Means for Solving the Problems] In order to be able to use the gut strings, a microphone unit
that captures air vibration is adopted, the howling is suppressed, and this microphone unit is
obtained in order to obtain a sufficient acoustic sense. Were placed in the space inside the
resonance cylinder. Also, in order to avoid the dead point of the standing wave in the resonance
cylinder which varies depending on the frequency, a plurality of microphone units are arranged
and their signals are mixed. In this method, the method of supporting the microphone unit is
important, and the fixing device has an insulator function so that the vibration and impact of the
resonance plate are not directly transmitted to the microphone unit and disturb the signal.
[Operation] A plurality of microphone units disposed in a space in the resonance shell of the
musical instrument picks up air vibrations at a plurality of locations in the resonance shell having
different phase and frequency amplitude characteristics and converts them into electric signals. ,
Mix. The insulator and fixing device that supports the microphone unit prevents unwanted
vibration and shock from the resonance plate from being transmitted to the microphone unit and
disturbing the signal.
embodiment of the present invention will be described below with reference to FIG. First and
second pressure type compact condenser microphone units (6a) and (6b) are connected in
parallel at a distance of about 12 cm by a connecting cable (7). An output cable (4) is connected
to the second microphone unit, and the output cable is passed through a ring-shaped screw type
insulator and fixing device (5), and about 3 cm from the second microphone unit. By the way, the
fixing device (5) is fixed to the output cable. A connector (8) is attached to the other end of the
output cable, and this connector has a drive circuit consisting of a battery, a capacitor, a variable
resistor, etc., and a microphone amplifier case (characteristic compensation circuit and output
terminal) 9) connected. On the other hand, the connection cable (7) is passed through the ring of
a rod-like slider (2) provided with a sliding ring at its tip, and the insulator of the same structure
as the fixing device (5) at the other end of this slider. Fixing device (1) is attached. This slide (2)
is structured to slide on the cable with appropriate friction.
The above screw type insulator / fixing device (5), (1) uses an elastic material such as sponge for
the inner wall of the ring to prevent unnecessary vibration and shock from being transmitted to
the microphone unit, and an output cable or It is structured to wrap and fix the slide. Also, the
fixing device itself may be made of a relatively soft material such as silicone rubber or
polyethylene. The connection cable (7) has a function of connecting the condenser microphone
units (6a) and (6b) in parallel in the resonance shell and averaging the signals of the microphone
units. The averaged signal is output to the outside of the instrument by the output cable (4). For
example, a single-core coaxial cable is used as the connection and output cables.
FIG. 2 shows the usage of the above embodiment. In FIG. 2, the microphone units (6a) and (6b)
are inserted into the resonance shell of the stringed instrument (10) such as a violin or
contrabass from the f hole (3), and the fixing devices (1) and (5) are Place one at each end of the
f-hole (3) and fix it to the instrument body with each screw. At this time, slide the slider (2) on
the connecting cable (7) to adjust the distance between the fixing devices (1) and (5) to a position
matching the length of the f hole of each instrument. The microphone amplifier case (9) is used
by fixing to the player's waist and chest. The final output is taken from the output terminal of
case (9). It is desirable that the arrangement position of the microphone units (6a) and (6b) in the
resonance barrel can be freely determined by the user. As the microphone unit in the abovedescribed embodiment, any electret condenser type or moving coil type microphone unit may be
used as long as it picks up air vibration and can withstand the impact of playing. In that case, it is
desirable to use a drive circuit, a characteristic compensation circuit, and a connection method
suitable for each microphone unit. Of course, the number of microphone units may be three or
Second Embodiment In the first embodiment, the individual microphone units (6a) and (6b) and
the microphone amplifier case (9) are separately connected by a two-core coaxial cable, and the
signal from the microphone unit is transmitted. Are transmitted to the above-mentioned
microphone amplifier without averaging or mixing. The connector (8) uses a connector
corresponding to a two-core coaxial cable. A mixer capable of arbitrarily changing the signal
mixing ratio from the microphone unit is incorporated in the microphone amplifier. Others are
the same as in the first embodiment. In the second embodiment, since the signal mixing ratio is
variable, it is characterized that the player can make his own desired tone.
Third Embodiment Next, a third embodiment of the present invention will be described with
reference to FIG. A plurality of microphone units (6) are disposed in the hollow of the resonance
cylinder of the stringed instrument (10), and a jack (11) is attached to the wall surface of the
resonance cylinder through the microphone unit (6) 11) Connect with the cable (12), attach the
insulator and fixing device (13) to the above cable (12), fix this insulator and fixing device (13) to
the inner wall surface of the resonance drum, Make up a stringed instrument. The insulator and
fixing device (13) may be attached directly to the microphone unit as long as sufficient insulator
function can be maintained. The drive circuit, the phase compensation circuit and the output
terminal are housed in the external microphone amplifier case (9) as in the first embodiment. The
above-mentioned microphone amplifier may be built in the resonance drum. In this case, it is
necessary to provide a lid for battery replacement on the instrument body. Furthermore, instead
of the jack (11), an oscillator and an antenna may be incorporated in the resonance cylinder to
make it wireless.
[Effects of the Invention] In this invention, since the microphone unit floats in the air, it is
possible to pick up sounds with a more natural feel compared to the method of adhering to the
instrument, while on the other hand, the above microphone -Since the unit is supported by a soft
cable or insulator, unnecessary shocks can be cut during playing. In particular, when the fixing
device is not directly attached to the microphone unit but attached to a cable near the
microphone unit, the cable itself also acts as an insulator due to its elasticity, so that the insulator
mechanism of the fixing device can be simplified. The use of gut strings is also possible because
air vibrations are captured, and using gut strings gives better results than using chrome strings.
Not only dead points can be avoided by using multiple microphone units, but thickness and
thickness are added to the sound by the enhancement effect, and the position of the microphone
units can be adjusted, and the mixing ratio of the signals can be changed. effective. Because the
microphone unit is in the resonance shell and it is difficult to feedback, the volume can be
increased even in live performance, and the mixing of other musical instrument sounds is
relatively small. In addition, in particular, the first and second embodiments are easy to attach
and detach, and there is no need to disassemble the instrument main body, and it is possible to
immediately return to the normal state where the pickup is removed.
Brief description of the drawings
1 is a perspective view showing a first embodiment of the present invention
2 is a perspective view showing an example of use of the embodiment of FIG. 1 mounted on a
stringed instrument
FIG. 3 is a perspective view showing a third embodiment of the present invention.
Explanation of sign
Reference Signs List 1 fixing device 2 sliding device 4 output cable 5 fixing device 6a, 6b
microphone unit 7 connection cable 9 microphone amplifier case 11 jack
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