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JPS5224056

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DESCRIPTION JPS5224056
1, Title of the Invention 2, Inventor 5 Ju 8 J 155 [Phase] Japan Patent Office ■ Japanese Patent
Application Laid-Open No. 52-24056 □ 0 Published Japanese Patent Application 52. (1977)
2.23 Japanese Patent Application No. <field 0 3 / ((Specification 1, title of the invention dividing
network 1, title of the invention dividing network
デバイディングネットワーク
3. Detailed Description of the Invention The present invention relates to a rounding dividing
network which divides a frequency signal into different frequency band signals and distributes
the divided signals to a plurality of speakers. In a so-called sound reproducing apparatus for
reproducing a signal from a disk, magnetic hoop record, FM broadcast, for example, to distribute
the output of an amplifier to a plurality of speakers separately receiving different frequency
bands. The Dividend 1 Gnetwork is one of the critical factors that determine the performance of a
sound reproduction device. As is well known, the dividing network is sufficiently amplified by an
amplifier to divide the nine signals into, for example, three bands of low, medium and high, a
speaker for low frequency band signal reproduction (hereinafter referred to as a woofer). It is a
circuit for distributing and supplying to a speaker for medium range signal reproduction
(hereinafter referred to as a squawker) and a speaker for high range signal reproduction
(hereinafter referred to as a tweeter). On the other hand, various speakers connected to the
dividing network 17 have been developed to increase the sound reproduction fidelity,
particularly in the woofer. Paying attention to the material of the cone and the shape of the edge
part of the cone, etc., it is carefully examined how the material is physically filled with the
amount and elasticity of the material. A speaker equipped with a cone having an amount of
elasticity and EndPage: 1 is physically preferable, so that more satisfying this condition is one of
the factors determining the performance of the speaker. However, when the performance of the
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speaker added with this condition is considered from the viewpoint of acoustic audibility, it can
not be said that the above-mentioned physical condition is necessarily acoustic aural [for
example, in woofer, the reproduced sound Lack of sense of volume, so-called reproduction of socalled deep bass is degraded. The acoustic balance with the reproduction sound of the other
scookers and tweeters causes the overall sound of the reproduction sound to be poor. Focusing
on this point, the present invention is a dividing network that performs division of frequency
band signals under excellent conditions of signals supplied to the speakers in order to satisfy the
audibility conditions of reproduced sound by the physically excellent speakers. It is provided.
Hereinafter, an embodiment of the dividing work according to the present invention will be
described in detail by examining the drawings. FIG. 1 shows a row in which the present invention
is applied to a parallel two-element constant resistance dividing network used in a two-way
speaker system, wherein the first input terminal αυ and the second input terminal t13 are
audible. A high band dividing circuit (13 for dividing the high band side signal of the frequency
band signal and the low band side dividing circuit I for dividing the low band side signal are
connected, and the output terminals of the respective dividing circuits are respectively on the
high band side) The signal output terminal ue, the low band side signal output terminal 1e, and
the common output terminal (I7) are connected.
The high frequency side dividing circuit 131 has the first input terminal (1υ and the high
frequency side output terminal (the first capacitor a1 inserted and connected between the 1S and
the output terminal of the capacitor 19 and the common output. The first coil 11 is connected
between the terminals αη. Said low rJ! , The side sorting circuit J4 includes the first input
terminal αB and the low-range output terminal (the second coil 1 inserted and connected
between e, the output side of the coil and the common output terminal (ID It is comprised with
the 2nd capacitor ¦ condenser (2I) connected mutually. The second input terminal Q3 and the
common output terminal uD are directly connected. The first capacitor (Is and the first coil (1 is
an input terminal 01)) of the high-frequency side dividing circuit 0 漕 has a predetermined total
number of audio frequencies applied to all audio frequencies (a crossover frequency) It is a
circuit which leads only the high band side signal to the output terminal 115) 1) 7) at the
boundary of the circuit and determines the crossover frequency. The answer 1 of the frequency f
and the inductance value can be obtained by the following equation. ω I)-J 7 ft (,. ー-seemingly
10 here where 010 C is the capacitor number, the inductance of the coil N) is 2πfo (fo + i
crossover frequency) Rou connection shield / / Bédance Ail 1st Konodenoosa 0 尚 is the load
wave number signal For example, it is preferable to use foils having good temperature
characteristics, for example, foils of good structure and polysapphire dielectrics, and one or more
brass snack conodensa. This is effective in reducing the heat loss due to the V-shaped flame in
the condenser 41 纏, and reducing the 慕 phase distortion of the p-c raw stool. The first coil 1lfl
and the coil involved t2 in the high frequency signal and the shadow # given to the sound quality
of the reproduction sound is large, and here, particularly, the inductance is obtained by the air
core coil. An air core coil is preferable because it gives an acoustically trivial sound quality as
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compared to other Chichi-core coil or ferrite core-containing coil in a □ 1 comparison. Also,
because it is excellent in the sense of reality, it is more suitable for circuits that handle high
frequencies and 5 signals. On the other hand, the second capacitor (2+) and the second coil +211
of the low-frequency side dividing circuit 1 and the element for determining the crossover
frequency (fo) 'e of the second coil +211, and each binding and the inductance value l It is
determined by This capacitor ■ υ is a capacitor involved in the low H signal, for example, a low
paper, a one-character sharpener, etc. A capacitor with a slightly larger dielectric loss compared
to the first capacitor FIIK involved in the high frequency signal It is more preferable to use the
above-mentioned method to reduce the resolution by reducing the resolution by using the
appropriate loss due to the dielectric loss.
1) The second coil (d) of the low-pass side divided circuit Q41 is an element that participates in
the low-pass signal EndPage: 2, and here a cored coil such as a ferrite cored coil, an iron cored
coil, or a silicon steel cored coil Inductance shall be given. The cored coil has higher permeability
and fewer windings compared to the air cored coil, so DC resistance is reduced and current loss
is also reduced. Therefore, it is effective when applied to the Uno input signal supply circuit that
handles a large current. In addition, since the cored coil can obtain a sound quality with a sense
of electric pressure in comparison with the air core coil, the weight reduction of the sound
accompanying the physical direction of the hill of Uno can be effectively compensated. FIG. 2
shows an example of the series type two-element type constant resistance type used in the twoway speaker system according to the present invention 1 (an example applied to an iding
network; And the first coil Sa, and the lower band side dividing circuit I is constituted by the
second capacitor (d) and the second coil c34. About the other part? The same parts as in FIG. 1
are indicated by the same reference numerals and the detailed description will be omitted. In this
circuit, the first coil is an element involved in the high frequency @ signal, and an air core coil is
used according to the spirit of the present invention, and the second coil is concerned with the
low frequency 11 signal In accordance with the spirit of the present invention, cored coils such
as ferrite cored coils, iron cored coils, silicon steel cored coils and the like are used. FIG. 3 shows
an example in which the present invention is applied to a parallel-type two-element constantresistor-type dividing fault used in a 3-way speaker system, the first input terminal (4I) and the
second input terminal ( The high frequency division circuit 4 and the middle frequency division
circuit-1 low frequency division circuit (祷 are respectively connected in parallel to 6). Then, the
high band dividing circuit (the output end of I is the high band signal output terminal 141G'4'f),
the output end of the mid band dividing circuit is the low band dividing circuit (the half band
signal output terminal-one). The output end of) is largely connected to the low band signal output
terminal (至) 6υ. The high band dividing circuit-is composed of a first capacitor (d) and a first
coil-. The first capacitor 67J is connected between the first input terminal tta and the high band
signal output terminal, and the first coil 1531 is the output end of the first capacitor and the high
band signal output terminal ( It is connected between 4 η 相 phases. The first capacitor 6 and
the first coil 素 子 are elements for determining the boundary frequency of the mid frequency
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band and the ^ frequency local frequency band (hereinafter referred to as the high side cross
frequency), The inductance value is obtained by the following equation.
ωOH where 0HCH is a capacitor g1SFIF is 2πfu (fu is a pigeon side cross-station wave
number) RH impedance of impedance #I first capacitor 6′J is a capacitor related to high
frequency signals and has excellent temperature characteristics as above Capacitors It is effective
to use a foil-wound plastic capacitor having a dielectric of 1% IJ propylene. The first coil is also a
coil involved in the high frequency signal, and here an air core coil is applied. The reason for
applying the air core coil is as described above. The middle range dividing circuit 2 is composed
of a second capacitor (b) connected in series and a third coil (4) and a second capacitor 5η
connected in parallel with a second coil (d). Capacitance and inductance are expressed by the
following formula: %% cM is a capacitor capacitance 4 crr = 2 and fLC f L is a low frequency and
a mid frequency cross frequency) impedance of the Fmtrl Skoker The second coil used for this
mid frequency division circuit 144 The (end) and third coil (4) apply to the cored coil, in
particular, the EndPage: 3 ferrite cored coil. Ferrite cored recoil is of the nature that the
permeability is located in the middle of empty 6 coil and iron core coil, the f-number childhood is
also located in the middle position, and delicate sound reproduction and heavy bass It is suitable
for a circuit that handles the mid-range signal while having the capability of reproduction and
moderation. The capacitor used for this division-circuit and reconnaissance is suitably a paper
condenser, mylar condenser, and MP condenser. Further, the low-pass dividing circuit (c) is an
element which is constituted by the fourth coil (d) and the fourth capacitor 6 and determines the
crossover frequency of the mid-pass and the low-pass. The respective capacitor resistors and
inductances which determine the cross frequency at are determined by the calculation formula of
CM and LM. The low-pass dividing circuit ′ ′ (the coil of IE 4 used in 49 is the element
involved in the low-pass signal and is a core-cored coil 4 iC iron cored coil or silicon steel cored
coil, etc.) It is assumed that a coil having a high permeability and a low Q property is used as
compared to the coil used for the division circuit. Iron-cored coils or silicon steel-cored coils have
higher permeability and lower Q compared to other ferrite cored coils or air-cored coils. This
property is acoustically consistent with the reproduction of bass. This is because of the magnetic
properties of the core, the resolution of the sound signal is slightly inferior to that of the other
coils, 1 = effectively working, and the woofer is paired with 7 to play the bass.
Note that the low frequency division circuit (4! The capacitor used in 9 is effectively a paper
capacitor, an MP capacitor, and an electrolytic capacitor, and combined with the properties of the
coil, enables more effective reproduction of a deep bass. FIG. 4 shows an example in which the
invention is applied to an in-line two-element constant resistance dividing network conveniently
used for a three-in-one speaker system 1-shaped cutting, and the high-frequency dividing circuit
And a first capacitor, and the band division circuit is composed of a second coil, a third coil, and a
second capacitor +67), and a third capacitor. The low-pass dividing circuit σ 呻 is constituted by
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the fourth capacitor ff1) and the fourth coil (7a). Here, the first coil 關 of the high band dividing
circuit 161) uses an air core coil, and the second coil 霞 of the band dividing circuit 霞 includes
the ferrite core The coil is used, and in the low-frequency division circuit (the fourth coil at the
top (the 7th coil uses an iron cored 6 coil or a silicon qI 4 cored coil). The reason for separately
using the coils of each band division circuit as described above is as described above. Based on
the spirit of the present invention, although the embodiments have been described, the present
invention is not limited to the application circuit of FIGS. 1 to 4 but can be applied to any pond
dividing network. As described above, the present invention is used in a circuit that divides one
audio frequency band signal into a plurality of bands, a circuit that divides a high band and a at
least two band division circuits that divides a low band. Since the coils are applied by coils of
different nature for each valley band, they operate very effectively on the reproduced signal. That
is, when a speaker system is configured with a speaker having a soundly superior structure, and
sound reproduction is performed by this speaker system, in particular, a phenomenon in which
the reproduced sound of Uno reduces in weight in sound quality is a particularly phenomenon of
the dividing network. Because it is effectively compensated by the coils used in the above, it is
possible to obtain a balanced sound quality of the reproduced sound in general.
4. Brief description of the drawings FIG. 1 is a circuit diagram showing a parallel type constant
resistance dividing network for a two loudspeaker system to which the present invention is
applied, and FIG. 2 is a circuit showing the same serial dividing network. Configuration diagram,
3 rd mr! Fig. 4 is a circuit diagram showing a parallel type constant resistance dividing network
for the third invention speaker system, and Fig. 4 is a circuit diagram showing a serial dividing
network in the same. 11.41 ··· First input terminal 12.42 · · · Second input terminal 13.43.61 · · ·
High-frequency dividing circuit 44, B · · · Mid-frequency dividing circuit 14, 45, 70 · · · · · · Lowpass dividing circuit EndPage: 419, 32.53.62 · · · · coils for high-frequency division 55, 56.65.66 ·
· · coils for dividing mid-range 20, 34, 58, 72 · · · low-pass Division coil 15, 17, 46, 47 ... High
band signal output terminal 48. 49 ... Mid band signal output terminal 16.17. 50, 51 ... Low band
signal output terminal Attorney Attorney Toshioka (Other one person) Fig. 1 Fig. 2 Fig. 3 Fig. 4
End Page: 55, List of attached documents' (1) One letter of attorney (2) one statement (3) one
drawing (4) request 1 copy ('5) 6 6 え 6 発 明 6 Inventors other than the above, patent applicants
or agents ; -, capital r cost + 1'1 District Uchisaiwaicho 1-j-6 east j; - Shibaura '□ care stock Board
(1 Higashihigashi a Tsutomu house-to. (7317) Patent Attorney General Kenichi Katayama,
Secretary General of Patent Office 1, display of the case. Showa 50 Japanese Patent Application
No. 83155 2, title of the invention 2, title of the invention dividing network, 73. Relationship with
the person who makes corrections Patent applicant Kawasaki City Ku-ku-ku Horiyoshi-cho 721
(3071 Tokyo Shibaura Electric Co., Ltd. representative Iwa-1) Formula 4 formulator, Tokyo
Tokyo Chiyoda Ward 1-1-6 Tokyo Shibaura Electric Co., Ltd Tokyo office more than statement 1,
title of invention 1, title of invention dividing network
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デバイディングネットワーク
3. Detailed Description of the Invention The present invention relates to a dividing network for
dividing an audio frequency signal into different frequency band signals and distributing and
supplying the divided signals to a plurality of speakers. In a so-called audio reproduction
apparatus for reproducing audio frequency signals, for example, signals from disk records,
magnetic tape records, and FM broadcasts, a dividing network for distributing and supplying the
output of an amplifier to a plurality of speakers separately receiving different frequency bands. Is
one of the important factors that determine the performance of the sound reproduction device.
When dividing network is divided into 3 bands of amplification and high as well known, is it
audible? 2M! A low-pass signal of a first-run 1-stop EndPage: 6 is used as a speaker for lowpass signal reproduction (hereinafter referred to as a woofer), and a mid-range signal is referred
to as a speaker c or less for a mid-pass signal reproduction This circuit is a circuit for distributing
and supplying signals to speakers (hereinafter referred to as tweeters) for high-frequency signal
reproduction. On the other hand, various speakers used in connection with the de-piping network
have been developed to increase the sound reproduction fidelity particularly in the woofer. In
particular, attention is paid to the material of the cone and the shape of the edge thereof, etc.,
and the selection and the manufacturing method of the physically lightweight and resilient
material are examined. A speaker having a lightweight and flexible cone is physically preferable,
and satisfying this condition is one of the factors determining the performance of the speaker.
However, when the performance of the speaker satisfying this condition is considered from the
viewpoint of acoustic audibility, it can not be said that the above physical conditions are
necessarily excellent in acoustic audibility. The so-called deep bass reproduction is deteriorated,
and the sound and lance with other squawker and tweeter reproduced sounds are disorganized,
which causes the overall sound quality of the reproduced sound to be poor. Focusing on this
point, the present invention provides a dividing network that performs division of frequency
band signals under excellent conditions of signals supplied to the speakers in order to satisfy
auditory conditions of reproduced sound by physically excellent speakers. It is a thing.
Hereinafter, an embodiment of a dividing network according to the present invention will be
described in detail with reference to the drawings. FIG. 1 shows an example in which the present
invention is applied to a parallel two-element constant resistance dividing network used in a twoway speaker system, which comprises a first input terminal (11) and a second input terminal (12
Are connected to a high band dividing circuit (13) for dividing the high band side signal of the
audio frequency band signal and a low band side dividing circuit (14) for dividing the low band
side signal. The output end is connected to the high band side signal output terminal (15), the
low band side signal output terminal (16), and the common output terminal (17).
The high frequency side dividing circuit (13) includes a first capacitor (18) inserted and
connected between the first input terminal (11) and the high frequency side output terminal (15);
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18) An output side and a first coil (19) connected between the common output terminal (17) and
the common output terminal (17). The first low side division circuit (14) comprises a second coil
(20) inserted and connected between the first input terminal (11) and the low side output
terminal (16); And a second capacitor (21) connected between the common output terminals
(17). The second input terminal (12) and the common output terminal (17) are directly
connected. The first capacitor (18) and the first coil (19) of the high-frequency side dividing
circuit (13) have predetermined frequencies (hereinafter referred to as "crossings") of all audio
frequency band signals applied to the input terminals (11) and (12). And a circuit for leading
only the high frequency side signal to the output terminals (15) and (17) to determine the
crossover frequency. The capacitance value and the inductance value of each element can be
obtained by the following. Here, C is the capacity of the capacitor, inductance of the coil ω 0 is
2πfo (fo is the crossover frequency) Ro is the impedance of the connected speaker The first
capacitor (18) is a capacitor related to the high frequency signal and has excellent temperature
characteristics For example, it is preferable to use a foil-wound plastic capacitor made of
polypropylene or mylar as a dielectric. This is effective in reducing the heat loss due to the
passing signal current in the capacitor and thus reducing the phase distortion of the
reproduction signal as much as possible. The first coil (19) is also a coil involved in the high
frequency signal, which has a great influence on the sound quality of the reproduced sound and
EndPage: 7, in which the inductance is obtained particularly by the air core coil. Air-cored coils, ',
are preferred because they give an acoustically # 1 finer sound quality compared to other ironcored coils or ferrite-cored coils. Moreover, since it is excellent in the sense of reality, it is
suitable for a circuit that handles high frequency signals. On the other hand, the second Conden's
f (21 ") of the low side division circuit (14) and the coil (20) of M2 are also elements that
determine the crossover frequency (fO), and each capacitance and inductance value Desired. This
capacitor (21) is a capacitor involved in the low-pass signal, for example, a paper, mylar, an
electrolytic capacitor, etc. A capacitor having a slightly larger dielectric loss than the first
capacitor (is) K involved in the high-pass signal. It is preferable to select and use it and add
appropriate noise due to the dielectric loss to reduce resolution.
The second coil (20) of the low-pass side divided circuit 'r14) is an element involved in the lowpass signal, and in this case a cored coil such as a ferrite cored coil, an iron cored coil or a silicon
steel cored coil It shall be given. The cored coil has higher permeability and fewer windings
compared to the air cored coil, so that the direct current resistance is small and therefore the
current loss is small. Therefore, it is effective to apply to the woofer input signal supply circuit
which handles large N 淀. In addition, since the cored coil can obtain a sound quality with 1its
acoustic weight compared to the air cored coil, the weight reduction of the sound accompanying
the physical improvement of the woofer is effectively compensated. FIG. 5 shows rFfJ of the A
signal (1800 Hz) and the B signal (2990 Hz) at the input terminal of the dividing network using
the capacitor polypropylene film capacitor and the air core coil applied to the coil in the circuit
configuration shown in FIG. Output signal taken out to the high band side output terminal and
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the low band side output terminal at that time, the A signal and the B signal are suppressed
through a TWIN-T filter (for 1, 8 kH2, 3 kH), The cross modulation signal of the A signal and the
B signal is supplied to a spectrum analyzer for audio, and the output of this analyzer is expressed
for easy understanding of the data recorded by the XY recorder. In the figure, solid lines other
than the A and B signals indicate high logic wave signals and port modulation signals at the
reduced side output of the dividing network, and broken lines indicate harmonic signals and
intermodulation signals at the high side output. So, in the actual recording and recording paper,
the solid line in Fig. 1 is blue. The broken lines are recorded in red and are superimposed on each
other. FIG. 6 is a diagram similarly showing intermodulation distortion in the output signal of the
dividing network using an electrolytic capacitor as the capacitor and a core (iron core) -human
coil as the coil. As clear from the comparison of both FIG. 5 and FIG. 6, it can be seen that the
mixed modulation signal shown in FIG. 6 is frequently generated at a high level of about 20 to 40
(dB). This means that in the dividing net, the electrolytic capacitor and the core-in coil are more
elements of generation of the mixed tone signal to the audio signal passing through in
comparison with the film capacitor and the air core coil. To demonstrate. And, when this
intermodulation signal component is radiated to space as sound, it becomes an accompanying
signal that contributes to the increase of 1 of the sound energy.
"Thus, film capacitors and inductance / air core coils are applied to capacitors involved in the
high band side signal in the dividing net 1'j;) work as in the above-mentioned embodiment, and
the above-mentioned capacitors are related to the low band side signal. By applying the cored
coil to the capacitor and inductance whose loss is large compared to the capacitor, it is possible
to enhance the intermodulation distortion level of the low band side signal compared to the high
band side signal. FIG. 7 is a diagram showing the characteristics thereof. In the circuit shown in
FIG. 1, a polypropylene capacitor is applied to the capacitor related to the high band side signal,
and an air core coil is applied to the inductance, and a capacitor VCN solution related to the low
band side signal The cross modulation distortion of the dividing network of the composition
which applied an iron core core coil to a capacitor and an inductance is measured. As apparent
from this characteristic diagram, the intermodulation distortion (shown by a solid line in the
figure) of the lower band signal is 20 to 20 as compared to the intermodulation EndPage: 8
distortion (shown by a broken line in the figure) of the highband side signal. 30 (d, 8) high level.
Since the intermodulation distortion component of this lower-side signal contributes to the
enhancement of the acoustic energy emitted by Woono as the signal to be delivered to Woono,
weight reduction of the sound generated in the Woeno which is superior in physical
characteristics A stone that exhibits the effect of making the sound quality excellent and sensible
by listening to the phenomenon. Further, the combination of the tweeter and the high-frequency
side sound with less intermodulation distortion radiated from the tweeter makes it possible to
obtain the sound quality in which the whole reproduction sound has a wide range of variance. 8
and 9 show low-pass and high-pass signals obtained by inserting an attenuator into the high-pass
signal output circuit of the denoising network and taking the noise output of the woofer and the
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coiler. And FIG. 8 is more practical than the characteristics shown in FIG. 7 as it is usually
performed as an attenuated mono-ha multi-way loudspeaker system with an antenator. In the
characteristic diagrams of FIG. 8 and FIG. 9, the correlation level difference between the
intermodulation distortion for the lower band signal and the intermodulation distortion for the
Takatsuka side signal is further increased. That is. It is demonstrated that intermodulation
distortion related to the high band side signal is reduced when an antenna is inserted compared
to when it is not inserted, and that the weight sensitivity effect on the sound of the woofer is
more effectively obtained. Ru. FIG. 2 shows an example in which the present invention is applied
to a serial two-element constant resistance dividing network used in a two-way speaker system,
and the high band side dividing circuit (13) is a first example. The low band side dividing circuit
(14) is constituted by a capacitor (31) and a first coil (32), and the low band side dividing circuit
(14) is constituted by a second condenser (33) and a second coil (34).
The other parts are denoted by the same reference numerals as in FIG. 1 'and the same parts are
not described in detail. On the basis of this, an air-cored coil is used, and the second coil (34) is
an element involved in the lower band signal, and the same <ferrite-cored coil, iron cored recoil,
silicon steel according to the spirit of the present invention. A wedged coil such as a cored coil
should be used. FIG. 3 shows an example in which the present invention is applied to a parallel
type two-element type constant resistance type divider used in a 3-way speaker system, and a
network # 10. A high frequency dividing circuit (43 '), a middle frequency dividing circuit (44)
and a low frequency dividing circuit (45) are connected in parallel to the second input terminal
(42), respectively. The output terminal of the high band dividing circuit (43) is connected to the
high band signal output terminal (46) (47), and the output terminal of the mid band dividing
circuit (44)-is connected to the mid band signal output terminal (48) (49) The output terminals of
the low band dividing circuit (45) are connected to the low band signal terminals (50) and (51),
respectively. The high band dividing circuit (43) is composed of a first capacitor (52) and a first
coil (53). A capacitor (52) of tal is connected between the first input terminal (41) and the high
frequency signal output terminal (46), and a first coil (53) is an output of the first capacitor r52;
It is connected between the end and the high band signal output terminal (47). The first capacitor
(52) and the first coil (53) are elements for determining the boundary frequency between the
middle frequency band and the high frequency band (hereinafter referred to as the high
frequency side crossover frequency), and each capacitor and inductance value are It is
determined by the following equation. Here, cH is the capacitor capacity LH, the inductance of
the coil ωOH is 2πfH (fH is the high side crossover frequency) RH is the impedance of the
tweeter The capacitor (52) of @ 1 mentioned above is a capacitor related to the high band signal
It is effective to use a foil-wrapped plastic sheet capacitor with a superior EndPage: 9 capacitor,
eg, polypropylene, mylar as a dielectric. The first coil is also a coil involved in the high frequency
band signal, and here an air core coil is applied. The reason for applying the air core coil is as
described above. The midrange dividing circuit (44) is composed of a second capacitor (54)
connected in series and a third coil (56) and a second capacitor (57) connected in parallel with
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the second coil (55). The respective capacitances and inductances are determined by the
following equations.
Here, CM is a capacitor capacity LM, coil inductance ωOL is 2πfL (fL is a low frequency and a
mid frequency cross frequency) RM is impedance of Skoker The second coil (55) used for this
band dividing circuit (44) The third coil (56) applies a cored coil, in particular, a ferrite cored coil.
Ferrite cored coils are of the nature that the permeability is located in the middle between the air
core coil and the iron core coil, and the acoustic effect is also present in the middle position, and
the ability with the reproduction of delicate sound is moderate It is suitable for the circuit which
has both and handles the mid band signal. The capacitors used for this division circuit (44) are
paper capacitors, mylar capacitors and MP capacitors. The solution capacitor is appropriate.
Furthermore, the low band dividing circuit (45) is an element which is constituted by the fourth
coil (58) and the fourth capacitor (59) and which determines the crossover frequency of the
middle band and the low band. 'Capacitances and inductances for determining the crossover
frequency can be obtained by the formula of CH * Lyl. The fourth coil (58) used for this low-pass
dividing circuit (45) is an element involved in the low-pass signal, particularly the iron cored coil
or the silicon steel cored coil, etc. It is assumed that a coil of the highest permeability and low Q
nature is used compared to the coil used in the high-pass dividing circuit. Iron-cored coils or
silicon steel-containing coils have higher permeability and lower Q compared to the other 71
light-cored coils and air-cored coils. This property is acoustically consistent with the reproduction
of heavy bass. Because of the magnetic properties of the core, the resolution of the acoustic
signal is appreciably inferior to that of the other coils, and the woofer is made to reproduce
heavy bass. The condenser used in the low-pass dividing circuit (45) is effectively a paper
condenser% MP condenser and an electrolytic condenser, and combined with the properties of
the coil, it is possible to reproduce more effective deep bass. FIG. 4 shows an example in which
the present invention is applied to a straight-to-two-element constant-resistance type divide-byone network used in series in a 3-way speaker system, and the high-frequency dividing circuit
(61) is a first coil. r62), and the capacitor (63) of @ 1, and the midrange dividing circuit (64)
comprises a second coil (65), a third coil (66) and a second capacitor (67)% The low pass dividing
circuit (70) is composed of a fourth capacitor (71) and a fourth coil (72).
Here, the first coil (62) of the high band dividing circuit (61) uses an air core coil, and the second
coil (65) s third coil of the band dividing circuit (64) 66) uses a ferrite cored coil, and further, the
fourth coil (72) of the low pass dividing circuit (70) uses an iron cored coil or a silicon steel cored
coil. The reason for selectively using the type of coil by each band division circuit as described
above is as described above. Based on the spirit of the present invention, several embodiments
have been described, but the present invention is not limited to the application circuit shown in
FIGS. 1 to 4 but any other dividing net EndPage: 10 work The application of The present
invention is used in a circuit for dividing an audio frequency band signal into a plurality of bands
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as follows: at least two band division circuits for dividing a high band and a low band. Since the
coil is applied by a coil of a different nature for each band, it operates extremely effectively for
the reproduced signal. That is, when sound reproduction is performed by a multi-way speaker
system configured with a speaker having a physically excellent structure, a phenomenon in
which the reproduction sound of the woofer is reduced in sound quality in particular is specified
as an element in the dividing network. Since the compensation is performed effectively, it is
possible to obtain an audio quality excellent in hearing.
4. Brief description of the drawings FIG. 1 is a circuit diagram showing a parallel type constant
resistance dividing network for a two loudspeaker system according to the present invention, and
FIG. 2 is a circuit showing the same series dividing network. The block diagram, the circuit block
diagram which shows a 3rd figure dividing network. Fig. 4 is a circuit diagram showing the
above-mentioned series dividing network, and Fig. 5 is cross modulation of the low band signal
and high band signal of the dividing network in which a polypropylene capacitor and an
inductance double core coil are applied as capacitors. Characteristic diagram showing the
correlation of distortion, Figure 6 is a capacitor! Solution capacitor. Characteristic diagram
showing the correlation of intermodulation distortion between the low band side signal and the
high band side signal of the dividing network in which the iron core coil is applied to the
inductance, Fig. 7 shows a polypropylene capacitor as a capacitor related to the high band side
signal The lower band signal when an attenuator is inserted into the high band signal output
circuit of the above dividing network, using tm capacitor in the capacitor used for air core coil 1i
for inductance and related to the lower band signal. It is a characteristic view which shows the
correlation of the intermodulation distortion of and the high frequency ¦ pass side signal. 11% 41
························· First input terminal 1z42-········· ························································ · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · Region dividing circuit 1445% 70 ······································
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···························· 20 20 ·············································· ········································ ... mid-range signal output
terminal 1a17.5α51 ·················· low-frequency signal output terminal attorney attorneys
Tomiokawarabe EndPage: 11
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