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Description 1, title of the invention
'Electro-acoustic transducer
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electroacoustic
transducer for providing an electrical signal representative of the sound produced by a musical
instrument. When recording performances of bands or orchestras composed of a wide variety of
instruments on magnetic tape in a recording studio, microphones are usually installed for each
instrument or for each group of instruments, and the electrical signals from each microphone are
Each track of the multitrack magnetic tape is recorded separately. This microphone is mounted
to produce an "iL" signal in response to air vibrations produced by the performance of the
instrument in the directional direction, such as condenser microphones which are commonly
used, such as condenser microphones. After recording, the recording signals from each of the
tracks are mixed and generally rerecorded on a two-trunk magnetic tape to create a master tape,
from which a stereo gramophone record is created. The mixing can adjust the relative amplitude
of the instrument. In order to effectively carry out the mixing, the signals recorded on each track
of the multi-track tape are substantially each one of a group of musical instruments or a
particular group of musical instruments. It is desirable, but in practice, it is difficult for certain
instruments, especially stringed instruments such as drums and pianos. Under the narrow
conditions of a conventional recording studio, the generally used microphones arranged to detect
the sound of the piano also detect the sound produced by the adjacent instruments. For this
reason, unless the other detection method is adopted, it causes a drop in the sound recording. A
similar problem also arises when using amplifiers and loudspeakers to amplify the live
performance of each in a concert hall). 1; always use an independent microphone for each
musical instrument, the signal from each microphone is. It is amplified and mixed before being
fed to the hall loudspeakers. However, for a certain instrument, the microphone tends to detect
not only the instrument in its pointing direction but also the sound of the adjacent instrument.
This problem is particularly pronounced for pianos, where the microphone directed to the piano
responds to the sound of the adjacent instrument as well as the piano, so that the desired sound
of the piano among the sounds emitted by the loudspeakers is obtained. It is often possible to
have saliency. In order to overcome the problems associated with such pianos, a pick-up device
has been devised which consists of longitudinally extending support members of the piano
A series of magnetic pickups are mounted on the support member and these magnetic pickers f
generate an electrical signal in response to the vibration of the strings when the keys of the
piano are pressed. However, in this method, as many magnetic pickups as the number of piano
strings are cheap, and considerably expensive. Furthermore, magnetic pickups require
complicated adjustments before use. It is necessary to individually adjust the case of the output
signals from the multiple pickups in order to obtain a single degree of amplitude in response to
each scale of the piano. In addition, all of the above-mentioned Bicaras f have to be placed close
to each string in order to obtain a satisfactory response, which requires complicated adjustments.
If the piano moves further, for example, moving to the front or back of the stage or transporting
it to the concert hall by trucking, the setting of the pickup is disturbed, and after the movement
of the instrument, eight complicated adjustments are made. The consumption of time. The
present invention has been made to eliminate the above-mentioned drawbacks, and in response
to a substantially attached musical instrument, complicated adjustment is anxious and easy to
install. EndPage: 3 simple and low cost electroacoustic conversion To provide the According to
the invention, the electroacoustic transducer is mounted on the surface of the instrument in use,
and the vibration of the surface causes the Ait transducer 75 to produce an electrical signal that
coats the sound produced by the playing of the instrument, resulting from the musical
instrument playing It vibrates by the sound. The transducer of this investigation is constituted by
an outer sheath of a plastic member, and in this outer sheath is covered a condenser microphone
composed of two electrodes interposed between dielectric layers. In use, a constant potential
difference is substantially applied to the electrodes in a balanced manner. It is designed to be
mounted in contact with the outer cover instrument surface so that vibrations generated during
musical instrument performance are sent to the electrodes and replaced in response to the
vibrations. As a result, an oscillating voltage is generated between the electrodes that covers the
sound produced by the music performance. The voltage generated between the electrodes is
supplied to the sense circuit. The sense circuit cures the amplifier which amplifies the oscillating
voltage from the fixed potential difference printed on the electrodes so that the output signal of
the amplifier is an electrical signal representative of the sound produced by the instrument. An
advantage of the present invention is that the electroacoustic transducer is attached to the next
surface of the musical instrument at the time of use and configured to respond to the vibration of
the surface, so that it responds only to the instrument attached to the substantial four, and its
output is from the adjacent musical instrument. It does not decrease by the sound.
Furthermore, because the electro-acoustic transducer of the present invention responds to the
full fundamental frequency range of most instruments, it does not require the complex balance
adjustments found in prior art magnetic pickups. It is also easy to install, and it can be fixed to
the instrument with a self-adhesive tape or fixed by screwing. Therefore, there is no need for
readjustment every time the instrument is moved. It is desirable that the condenser microphone
be interposed between a flexible plastic member and a rigid plastic support member mounted on
the side between the musical instruments. Applicants' experiments have shown that this
arrangement improves the transmission of surface vibrations of the instrument to the electrodes.
As a desirable condition of the A '+] gt condenser microphone, a second 1 L pole having a layer of
a drawn foil of a static temple electric member and a drawn flat outer surface of a special heatsensitive foil. The first electrode is accommodated in the planar package, and the dielectrics
between the electrodes are electrically isolated from each other. Desirably, the jacket is a stretch
box of plastic material with a lid. Preferably, the condenser microphone is interposed between
one wall or lid of the box and the body of the flexible plastic member as well as the member of
the box or the value lid. An embodiment of the present invention will be described below with
reference to the drawings. The electroacoustic transducer shown in FIG. 1 to FIG. 3 is formed by
an extension box 1 of a rectangular shape 2 with an open side and connected to the output jack
socket 4 in the box 1 A condenser microphone is accommodated. The box 1 is filled with a coldcurable polyurethane compound 5 and closed by a lid. = Jii self-condenser The microphone 3 is
sealed in the plastic cover j. In use, the transducer rectangle 2 contacts the instrument surface
and resonates on the surface with the sound produced by the instrumental performance. A sense
circuit as shown in FIG. 4 is connected to the condenser microphone via the jack socket 4 to
provide an electrical signal that covers the sound produced by the instrument. The structure of
the transducer will now be described in detail with reference to FIG. Furthermore, the various
layers of the transducer are shown enlarged in the figures for the sake of clarity. The box 1 is
attached to the lower longitudinal side of the rectangular body 2 and has a density of 0.002 to
0.003 inches and is filled with molded polystyrene; It is composed of a piece of double-sided tack
layer fabric tape 7.
The condenser microphone 3 has a piece of adhesive polyester tape 8 and is attached to the
upper part j of the condenser microphone a and the rectangular body 2 in the longitudinal
direction according to EndPage: 4. The condenser microphone 3 is composed of a first central
electrode 9 composed of a stretched piece of aluminum foil accommodated in a second electrode
piece composed of a flexible aluminum foil stretched sheath. The first 't 5 pole 9 is totally H
sealed with a dielectric, and this dielectric 11 can be polarized or polarized. In this example, the
dielectric 11 is composed of a self-adhesive polyester tape attached to the electrode 9. There is a
small void between the dielectric 1) and the second electrode. In the box 1 a cold-curable
polyurethane compound 5 is clamped above the condenser microphone. The compound
generally has a thickness of U3 / 8 inches at cIJ. Accordingly, the condenser microphone 3 is
housed between the relatively strong support member and the flexible plastic member 5 at the
relative lj system. One side of the double-sided self-adhesive polyester tape 12 is attached to the
top of the compound 5 and the other side is attached to the lid 6. The lid 6 is made of a
polyethylene sheet, and is attached to the peripheral recess 1a formed in the box 1 at its
peripheral portion. Referring to FIG. 1, the jack socket 4 has two output terminals (not shown).
The first and second output terminals have front and rear first and second electrodes 9. The
coaxial cable 13 is connected to xo (see FIG. 2). One lead of the coaxial cable 13 is e-bent to the
first electrode, and the other lead is soldered to the second electrode. A sock plug (not shown) fits
into the socket 4 and a coaxial cable connects the electrodes 9, 10 to the input 14.15 of the
sense circuit shown in FIG. This sense circuit marks a constant potential difference between the
electrodes 9 and 10 in FIG. 2 and detects and amplifies the oscillating voltage developed between
the symbiosis by means of a microphone responsive to the sound produced by the instrument. A
dry cell B which is housed in an 8 ′ ′ jis L lance circuit box (not shown) and drives the metal
box and the circuit is housed. The dry cell B outputs 18 volts (b) with respect to the ground
potential between the lines Q1 and Q2. The circuit can also be driven by an external power
This external source is usually used for recording in studios, and is used as a general 48 Gelt (DC)
DC power supply known as the p, a, system or “phantom” power supply that employs a mixer.
it can. When using the Mfi phantom power supply, connect with the terminal 16.17.18 of the
circuit with a cannon plug. It is taken out by the output signal line jack plug socket 19 from the
circuit and taken out by the cannon plug connected to the terminals 16 and 17 ° 18 if phantom
power is not used. The cannon plug is balanced to ground. The power supply from the phantom
turtle source or the 'turtle' from the dry cell B is selected by the switch Sl via the resistors R1, R,
and the DC bias voltage is impressed on the terminal 14.15 via the resistor R8. The electrodes 9,
10 of the resulting condenser microphone are biased. When using a converter as described
below, an oscillating voltage is induced between the terminals 14.15. The amplitude voltage is
applied to the input of the operational amplifier IC via a capacitor C1 which blocks DC bias. The
amplified output signal of the amplifier IC is supplied to the output jack 19 via the capacitor C2
and the resistor R4, and the transformer T! Is supplied to the canon plug output terminal via The
transformer TI is balanced against the cannon grab output signal. Said amplifier ICE is formed
with a feed imbalance including a resistor R5 and a capacitor C3. This loop provides a single
frequency response. The battery test circuit comprising the circuit e, the bush button PB, the
light emitting die EndPage: 5 ode LED and the resistor R6 is cured. If the previous 1 positive
battery B is in good condition. When the button PB is pressed, the light emitting diode blinks. Of
course, the test circuit can also be used when a phantom power supply is connected. When the
transducer is used, it is attached to the instrument surface which is vibrated by the sound
produced by the musical instrument play with the self-adhesive tape 2. The four peristaltic
surfaces generate vibrations of the electrodes 9, 10 and thus affect the space of the electrodes 1
"1, whereby the input 14.15f! Produce a swing j voltage of 'i. This oscillating voltage is amplified
by the amplifier IC. The applicant has found that the amplified signal produced at the output
17.18, after being further amplified and supplied to the Lou P loudspeaker, provides a sound
which accurately represents the sound of the instrument to which the transducer is attached.
One of the reasons why such a good response is IQ in the frequency spectrum and amplitude lou
is because of the relatively strong member where the condenser microphone is in contact with
the vibrating surface of the musical instrument and the relatively flexible member (plastic
member) Because it is inserted in 1f41 of. The rectangular body rigid against the relative
movement of the box efficiently transfers the vibration of the instrument to the condenser
microphone. The flexible plastic member 5 also produces a substantial relative movement of the
electrodes 9, 1o over a wide frequency range, in particular over the entire fundamental
frequency range of the piano. Furthermore, the converter described above has the advantage that
it only detects the sound of the instrument to which it is attached and not the sound of the
adjacent instrument. The converter of the embodiment described above can be used for many
instruments, in particular for stringed instruments and drums. However, it can be used
particularly effectively for the piano, and as shown in FIG. 5, two transducers can be attached to
obtain stereo sound of the piano. The transducer is attached to the lower acoustic plate of the
piano. As described above, signals responsive to the entire fundamental frequency of the piano
can be detected by the converter and the sense circuit. 6 and 7 show another embodiment of the
converter of the present invention. In this embodiment, the condenser microphone 3 described
above is accommodated in a box; zoV-g, and is attached to a lid 2 of the box, which is a point
different from the above-described embodiment. The lid 21 of the box 20 is designed to be
mounted in contact with the vibrating surface of the instrument. Within the box 20 there is a
plastic elongated rectangular block 22 with a recess 23 formed at one end, and a channel 24 for
receiving a cable soldered to the condenser microphone. The surface of the block 22 facing the
agency Jd self-cover 2 is covered with a sticky piece 26 of cytoplasm, and the condenser
microphone 3 has a stick 7 # L on the piece 26, and the piece has a cut-out Rfli-27. The cut-out
position 27 places the cable 13 and its solder parts in the recesses and channels 23 and 24. The
condenser microphone 3 covers the double-sided self-adhesive piece 28 and the piece 28i1. The
L microphone 3 is held in contact with the lid 21. The cable 13 is led out of the box 2 o through
the hole 29. The box 20 has a peripheral Franz 3o which is vacuum formed of 2t ++ m thick
styrene) and is sealed to the lid 21.
The lid 21 is made of 1 m thick polystyrene sheet 1 * and has a size of 8 no inches x 1 100
inches. As can be seen from FIG. 6, a small void exists in the box 20 and the m of the Gerastic
block 22 ". A double-sided self-adhesive tape 3 is provided on the outside of the lid 2 and is used
to attach the lid 2 to an instrument. If more rigidly fixed, it is iJTMe to drill a hole in the
peripheral flange 3o of the transducer and screw it to the instrument. As described above, since
the condenser microphone is structured to be interposed between the relatively rigid polythene
member of the lid 2 in contact with the musical instrument and the relatively flexible cell
member EndPage: 626 of the flexible membrane member described above The two embodiments
can both be mounted in the same way, even if the mounting method in the box J is different.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of an
electroacoustic transducer showing one embodiment of the present invention. 2 is an enlarged
cross-sectional view of the electroacoustic transducer shown in FIG. 3 is a schematic perspective
exploded view of the 'α electroacoustic transducer shown in FIG. FIG. 4 is a schematic circuit
diagram of an electrical sense circuit connected to an acoustic transducer. Fig. 5Q, a schematic
view of two 'I air acoustic transducers placed below the grand piano. FIG. 6 is a perspective view
showing another embodiment of the air-acoustic transducer in kJ '+. FIG. 7 & J, 6 are schematic
perspective exploded views of the electroacoustic transducer shown in 1. FIG. DESCRIPTION OF
SYMBOLS 1 ... Stretched box, 2 ... long square JPI "iA ', 3 ... Condenser microphone, 4 ... Jack
socket, 5 ... Cold-curable polyurethane compound, 6 ... Lid, 7 ... Double-sided adhesive fabric tape,
8 ... double-sided polyester layer polyester tape, 9, 1 o ... electrode, 11 ... dielectric, 12 ... doublesided self-adhesive polyester tape piece, 13 ... coaxial cable , 14.15 ° ° sense circuit input,
16.17.18 ... terminals, 19 ... slip plug socket, 2 o ... box, 21 ... lid, 22 ... plastic acrylic resin , 23 ...
recess, 24 ... channel 26, 26 ... adhesive piece, 27 ... cut out position, 28 ... double-sided selfadhesive 7 & 'piece, 29.32 ... hole, 30 ° · · Peripheral flange, 3 · · · both sides self The pressuresensitive adhesive tape. Applicants Attorney Attorney Takehiko Suzue F / G, 5EndPage: 7
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