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JPH01316098

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DESCRIPTION JPH01316098
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electroacoustic transducer for passing an electrical signal only in a predetermined frequency
band to generate sound in an allowable band. 2. Description of the Related Art In general, in an
electroacoustic transducer, as shown in FIG. 4, an electrical signal input from an external input
terminal 26 is divided into several bands according to frequency in order to generate better
sound. Band-pass filters 21 and 22 using coils and the like are provided in order to convert into
voices by the speakers 24 and 25 adapted to the respective frequencies. The above band-pass
filters 21 and 22 are four-terminal circuits, and an electric signal in a specific frequency band is
allowed to pass without any problem, but electric signals in other frequency bands are
significantly attenuated. It has the property of preventing the passage of electrical signals. These
band pass filters 21 and 22 are classified into the high pass filter 21 and the low pass filter 22
according to the attenuation characteristics thereof, and are connected to the speakers 24 and
25 having characteristics suitable for the respective components to constitute an electroacoustic
transducer. Be done. However, in the band-pass filters 21 and 22 described above, the wire itself
of the coil has resistance. Therefore, for example, taking the low pass filter 22 which is one of the
band pass filters 21 and 22 as an example, as shown in FIG. 5, the electroacoustic transducer is
provided with a low pass filter indicated by a dotted line in the figure. The characteristic curve
port of the electroacoustic transducer through the conventional low-pass filter 22 shown by a
solid line with respect to the characteristic curve a of the theory "-" is the material itself such as a
coil used for the above-mentioned low-pass filter 22 The output level is lower by the amount of
resistance, and the theoretical output level can not be obtained. Therefore, a wire having a larger
wire diameter has been used as a wire of the coil so that the resistance of the low-pass filter 22 is
reduced. [Problems to be Solved by the Invention] However, in the above-mentioned conventional
electroacoustic transducer, although the resistance by the coil can be lowered in the band-pass
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filter, the coil itself is disadvantageously increased in size. It was [Means for Solving the
Problems] In order to solve the above-mentioned problems, an electro-acoustic transducer
according to the present invention comprises a band-pass filter having a coil for changing
impedance according to the frequency of an electric signal input from the outside; An electroacoustic transducer comprising a speaker for converting an electric signal inputted through a
band-pass filter into voice, characterized in that the coil is formed of a wire of a superconducting
material not accompanied by an electric resistance. .
[Operation] With the above configuration, it is possible to eliminate the electrical resistance from
the coil of the band-pass filter provided to the electroacoustic transducer, and it is generated by
passing through the band-pass filter regardless of the wire diameter of the wire used in the coil.
It is possible to almost eliminate the attenuation of the usual electric signal. Therefore, it is
possible to maintain the output level from the band pass filter incorporated in the electroacoustic
transducer at almost the theoretical output level without increasing the size of the band pass
filter coil. An embodiment of the present invention will be described below with reference to
FIGS. 1 to 3. The electro-acoustic transducer according to the present invention, as shown in FIG.
1, comprises a high-pitched speaker 4 for generating high-pitched sound and a low-pitched
speaker 5 for generating low-pitched sound on one side of a machine frame 9 Is provided. The
high-pitched speaker 4 is connected to the external input terminal 6 through the high-pass filter
1 as a band-pass filter, while the bass speaker 5 is an external input terminal through the lowpass filter 2 as a band-pass filter Connected to six. In the high-pass filter 1 described above, as
shown in FIG. 2, the lead wires 13 and 15 are respectively connected from the two input
terminals 13a and 15a to the two output terminals 13b and 15b, and these leads vA13 15 is
configured to be connected by the coil 11 from the middle. On the other hand, in the low pass
filter 2, as shown in FIG. 3, two input terminals 14a and 16a and two output terminals 14b and
16b are connected by lead wires 14 and 16, respectively, A coil 12 is interposed in the middle of
one of the lead wires 14. Here, a superconducting material is used for the wire of the coils 11
and 12, and the wire is set to have an electrical resistance of 0 "regardless of the size of the wire
diameter. Although the material of the above-mentioned superconducting material is not
specifically limited, for example, in the case where a temperature lower than normal temperature
is required to make the superconducting state without losing the electrical resistance, liquid
nitrogen may be used if necessary. And a cooling medium such as liquid helium. In the above
configuration, when an electrical signal is input to the external input terminal 6 from an amplifier
or the like (not shown), this electrical signal is sent to the high pass filter 1 and the low pass filter
2 described above. In the high pass filter 1 described above, an electrical signal is input from the
input terminals 13a and 15a to the lead wires 13 and 15. At this time, since the electric signal
having a low frequency is not included in the allowable band of the high pass filter 1, the short
circuit from the coil 11 in the superconducting state does not reach the output side terminals
13b and 15b.
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On the other hand, since the electric signal having a high frequency is included in the allowable
band of the high-pass filter 1, the impedance of the coil 11 is increased to make it difficult to
pass the electric signal. An electric signal is sent from the speaker 15 b to the high-pitched
speaker 4 to emit sound. In the low pass filter 2 described above, an electrical signal is input
from the input terminals 14a and 16a to the lead wires 14 and 16. At this time, the high
frequency electric signal is not included in the allowable band of the low pass filter 2 and raises
the impedance of the coil 1'2 to make it difficult to pass the electric signal, so the output side
terminals I4b and 16b It never reaches. On the other hand, since the low frequency electric
signal is included in the tolerance band of the low pass filter 2, the electric signal is outputted
from the output terminal 14. B · 16 b is sent to the bass speaker 5 to emit sound. As described
above, since the superconducting material is used as the wire of the coils 11 and 12, the electric
signal can be output as it is with almost no attenuation of the electric signal regardless of the
wire diameter of the wire. . Therefore, it is possible to keep the output level from the band-pass
filter 2 incorporated in the electroacoustic transducer at almost the theoretical output level
without causing the enlargement of the band-pass filter coil. As described above, the electroacoustic transducer according to the present invention includes a band-pass filter having a coil
for changing the impedance according to the frequency of the electric signal input from the
outside, and the band-pass filter In an electroacoustic transducer provided with a speaker which
converts an electric signal into voice, it is the composition by which the above-mentioned coil
was formed with a wire of superconducting material which does not accompany electric
resistance. Therefore, it is possible to keep the output level from the band pass filter 2
incorporated in the electroacoustic transducer at a theoretical output level without increasing the
size of the band pass filter coil.
[0002]
Brief description of the drawings
[0003]
FIGS. 1 to 3 show an embodiment of the present invention, and FIG. 1 is a cross-sectional
explanatory view of an electroacoustic transducer, and FIG. 2 is a high pass filter disposed in the
electroacoustic transducer. FIG. 3 is a circuit diagram of a low pass filter disposed in the
electroacoustic transducer.
4 and 5 show a conventional example, and FIG. 4 is an explanatory view of an electro-acoustic
transducer 8 '' in cross section, and FIG. 5 is an electro-acoustic transducer through a low pass
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filter at frequency and output level. Is a graph comparing the theoretical characteristic curve to
be possessed with the characteristic curve possessed by the electroacoustic transducer through a
conventional low pass filter. 1 · 21 is a high pass filter (band filter), 2 · 22 is a low pass filter
(band filter), 4 is a treble speaker, 5 is a bass speaker, 6 · 26 is an external input terminal, 9 · 29
is Machine frame 11, 12: coil (superconducting material), 13, 14 15, 16: lead wire 13a, 14a, 15a,
16a: input side terminal 13b, -44b-15b. 16b is an output side terminal, and 24 and 25 are
speakers. Fig.1 Fig.2 Fig.1 Fig.4 Fig.5 Frequency [H2]
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