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JPH07298386

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH07298386
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio power amplifier (hereinafter referred to as a main amplifier). The present invention relates
to a dividing network connected between a) and a speaker.
[0002]
2. Description of the Related Art Generally, a method using a dividing network is known as a
method of constructing a multi-way speaker system. Divided network (hereinafter abbreviated as
network) ) Is for dividing the driving power from the main amplifier for each divided frequency
band and supplying it to the speaker for each band.
[0003]
The circuit configuration of the network varies depending on the number of component speakers,
but basically it is composed of an LPF (low pass filter), an HPF (high pass filter), or a BPF (hand
pass filter) that is a combination thereof. Passive elements such as (coils) and capacitances
(capacitors) are used. For example, in the case of a 2-way system, an LPF is used for a woofer
(speaker for bass), and an HPF is used for a tweeter (speaker for treble) Be In the case of the 3way system, since a squawker (speaker for medium sound) is used in addition to the abovementioned woofer and tweeter, BPF is further added.
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[0004]
In addition, the circuit configuration of the network also differs depending on the way of the
attenuation characteristic in the cut-off region of each division frequency, and the attenuation
characteristic is generally -6 dB / oct (the same applies hereinafter), -12 dB / oct, -18 B / oct.
Such characteristics are typical, and in some cases -24 dB / oct may be used. Here, FIG. 6 shows a
circuit example of a -12 dB / oct type network used for the 3 WAY speaker system. As can be
seen from FIG. 6, when it is intended to obtain an attenuation characteristic of -12 dB / oct, LPF 3
and HPF 1 are L-type circuits in which filter elements are connected in an L-shape to the wiring
path, and BPF is a T-type filter circuit. It becomes.
[0005]
Although not shown, in the case of a -6 dB / oct network, one filter element is inserted in series
only in the positive wiring path. In the case of -18 dB / oct, the LPF and the HPF are T-shaped
filter circuits, and the BPF is a saddle-shaped filter circuit. The L-type filter, the T-type filter, and
the vertical filter are generally well known circuits, and the detailed description thereof is
omitted.
[0006]
The characteristic feature of the above-mentioned conventional network is that, in any network,
there are positive (+,-) pairs of filter elements to be connected in series to the wired circuit. It is to
be inserted only in one side (generally positive side +) among the roads. As a matter of course, in
the present specification, the positive side and the negative side are expressions that indicate the
phase of AC power, and do not indicate + and − on a DC circuit. When music is played using the
conventional network with such a configuration, the playback sound from the speaker may cause
a sense of inconsecutive hearing or lack of transparency, and in other words, it may often sound
duller. .
[0007]
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2
On the other hand, particularly in the case of multi-way, in order to adjust the output sound
pressure level of the speaker for each band, an attenuator is used between the tweeter and the
squawker with each filter. Here, FIGS. 7A and 7B show an example of a conventional constant
resistance type attenuator. In the attenuator shown in FIG. 7A, the sliding position with respect to
the resistors R1 and R2 changes by moving the slider 24, and a divided voltage corresponding to
the change is supplied to the voice coil of the speaker It is intended to The attenuator shown in
FIG. 7B is configured to connect the fixed resistors R1 and R2 in an L shape, and supplies this
divided voltage to the voice coil of the speaker.
[0008]
However, this attenuator also has the same problem as the above-mentioned network, and the
condition of the current path is different between the positive side half wave and the negative
side half wave of the driving power, so that the reproduced sound is audible. In some cases, it
was felt that it was broken or lack of transparency, and in other words it could be heard as dull.
Therefore, an object of the present invention is to provide a dividing network capable of
providing good music reproduction by providing symmetry in driving power supply conditions
for speakers.
[0009]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a dividing
network according to the invention of claim 1 comprises at least a pair of positive and negative
wiring paths (line 1 and line 2) as shown in FIG. And a filter element (F) that has a filter element
inserted and connected in series with the wiring circuit, and extracts and outputs the power of
the necessary frequency component from the input AC drive power (P). In the network, the filter
element has a half value of a filter constant necessary for setting a desired pass frequency or cutoff frequency, and is symmetrically inserted and connected to each of the positive and negative
wiring lines (line 1 and line 2) Filter elements (F1, F2).
[0010]
In addition, the present invention is applied to a dividing network including filters with
attenuation characteristics of -6 dB / oct, -12 dB / oct, -18 dB / oct and -24 dB / oct in a
preferred embodiment.
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3
Also, the present invention is applied to a dividing network including a low pass filter, a band
pass filter, and a high pass filter in a preferred embodiment. Further, according to the present
invention, in a preferred embodiment, fixed resistances of the same value are symmetrically
connected to a pair of positive and negative wiring lines (line1 and line2) at the output end of the
filter (F) of each of the dividing networks. Is configured.
[0011]
Furthermore, according to a preferred embodiment of the present invention, an attenuator (ATT)
is connected to an output end of the filter (F) of each of the dividing networks, and the attenuator
spans between a pair of output ends of the filter. The constant resistance elements (R1, R2, R3)
connected to each other and the contact resistance are provided to be able to come into sliding
contact with each other, and the sliding directions can be interlocked in opposite directions with
each other and determined by the sliding position And an adjustable pair of sliders (25, 26)
capable of increasing or decreasing the resistance value, and an output end is introduced from
each of the pair of sliders (25, 26). Here, the resistance elements (R1, R3) have the resistance
values after being adjusted to be equal to each other.
[0012]
According to the invention, the filter elements (F1, F2) each having a half value of the filter
constant necessary for setting the desired pass frequency or cut-off frequency are a pair of
positive and negative wiring paths (Symbols of line 1 and line 2) are inserted symmetrically, so
the current of the positive side half wave and the negative side half wave of the drive power (P)
supplied from the main amplifier are respectively connected to the pair of positive and negative
wiring paths The signal is passed under the same circuit conditions (current path) and supplied
to the voice coil of the speaker (SP). Therefore, since the positive / negative symmetry of the
drive power waveform with respect to the speaker in the dividing network can be maintained, the
symmetry of the reciprocating motion of the diaphragm of the speaker can be secured, and a
good music signal can be reproduced.
[0013]
The improvement of the sound quality by ensuring the symmetry of the insertion position in the
wiring path of the filter element (F1, F2) is considered as follows. That is, since the music signal
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has a complicated signal waveform and has a pulsating rise (or fall) transient characteristic, the
drive power (P) supplied from the main up has a complex and abrupt signal polarity. Switching
occurs. In the conventional network, since the filter element connected in series with the wiring
path is inserted into only one (positive side) of the positive / negative pair of the wiring, the
transient phenomenon of the filter element (coil back EMF or capacitor Conditions of supply of
drive current are not symmetrical due to Therefore, the symmetry of the vibration velocity of the
diaphragm corresponding to the positive side half wave and the negative side half wave is lost
when the drive power is supplied to the speaker, which may cause the above-mentioned auditory
problem. . However, according to the present invention, it is possible to generate a good music
signal as described above.
[0014]
Further, according to the invention as set forth in claim 9, fixed resistance elements (R1 / 2, R1)
in which drive powers (P) whose symmetry is secured by the dividing network of any
configuration are symmetrically arranged. Since the current supplied to the speaker is supplied
to the speaker through (2, R2), the current supply conditions of the voice coil accompanying the
switching of the signal sound become the same for the positive half wave and the negative half
end wave, and the current symmetry is Secured.
[0015]
Furthermore, according to the invention as set forth in claim 10, the resistance elements (R1, R2,
R3) and the slide in which drive powers (P) whose symmetry is ensured by the dividing network
of any configuration are symmetrically arranged. It is supplied to the speaker via the dynamic
elements (25, 26).
As a result, the current supply condition of the voice coil accompanying the switching of the
signal sound becomes the same for the positive half wave and the negative half end wave, and
the symmetry of the current is secured. In a speaker system including an attenuator, which is
often the case, characteristic degradation due to the attenuator can be prevented, and good
music signal reproduction can be achieved.
[0016]
The invention will now be described with reference to a travel embodiment of the invention.
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(First Embodiment of the Present Invention) FIG. 2 shows a first embodiment of the present
invention. This embodiment discloses an example of a good network for a 3 WAY speaker system
with -6 dB / oct attenuation characteristics. The network is configured to include the HPF 5, the
BPF 16 and the LPF 17. The input terminals of the HPF 15, the BPF 16, and the LPF 17 are
commonly connected to the input terminal 4 and the input terminal 5. The output terminals 6
and 7 of the HPF 15 are positive phase connected to the tweeter 12, the output terminals 8 and
9 of the BPF 16 are positive phase connected to the squawker 13, and the output terminals 10
and 11 of the LPF 17 are positive phase connected to the woofer 14.
[0017]
The HPF 15 has a capacitor with a capacitance value of 2C obtained by dividing the capacitance
of the capacitor set in light of the cutoff frequency of the HPF 15 by 2C inserted in series in the
positive side wiring path line1 and the negative side wiring path line2, respectively. Between the
positive side wiring line line1 and the negative side wiring line line2, symmetry of the capacitor
capacity as a filter element is taken.
[0018]
The BPF 16 is a series of a capacitor having a capacitance value of 2C obtained by multiplying
the capacity of the capacitor C set by 2 in light of the cutoff frequency of the BPF 16 and a value
obtained by dividing the inductance value of the coil L by 2 = L / 2. A circuit is inserted in series
with each of the positive side wiring line line1 and the negative side wiring line line2, and the
filter element is symmetrical between the positive side wiring line line1 and the negative side
wiring line line2. .
In the LPF 17, a coil of a value of L / 2 obtained by dividing the inductance value of the coil L set
in light of the cutoff frequency of the LPF 17 by 2 is inserted in series in the positive side wiring
path line1 and the negative side wiring circuit line2. Similarly to the above, the symmetry of the
coil L as the filter element is taken between the positive side wiring circuit line1 and the negative
side wiring circuit line2.
[0019]
In the above configuration, in the case of the HPF 15, the power component of the positive half
wave of the drive current supplied from the main amplifier is input terminal 4 → positive wiring
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path line 1 → capacitor 2 C → tweeter 12 → capacitor 2 C → negative wiring circuit It flows
along the path of line 2 → input terminal 5. The current component of the negative side half
wave opposite to this flows in the path of input terminal 5 → negative side wiring path line 2 →
capacitor 2 C → tweeter 12 → capacitor 2 C → positive side wiring circuit line 1 → input
terminal 4.
[0020]
As described above, since the drive current flow conditions are the same for the positive side half
wave and the negative side half wave of the drive power, symmetry of the reciprocating vibration
of the diaphragm of the tweeter 12 is obtained, and the amplitude of the input music signal is
obtained. It will be possible to convert it into an air pressure wave (i.e. sound wave) with a
corresponding amplitude. As a result, good music reproduction is possible. The operation
described above is the same as in the BPF 16 and the LPF 17 and can be easily understood from
the above description, so the detailed description will be omitted.
[0021]
Second Embodiment FIG. 3 shows a second embodiment of the present invention. This
embodiment discloses an example of a good network for a 3 WAY speaker system with -12 dB /
oct attenuation characteristics. The network is configured to include the HPF 18, the BPF 19, and
the LPF 20. The input terminals of the HPF 18, the BPF 19, and the LPF 20 are commonly
connected to the input terminal 4 and the input terminal 5. The output terminals 6 and 7 of the
HPF 18 are positive phase connected to the tweeter 12, the output terminals 8 and 9 of the BPF
19 are positive phase connected to the squawker 13, and the output terminals 10 and 11 of the
LPF 20 are positive phase connected to the woofer 14.
[0022]
Also in this embodiment, as in the first embodiment, the symmetry of the circuit in the filter is
taken. That is, in the HPF 18, a capacitor with a capacitance value of 2C obtained by multiplying
the capacity of the capacitor C set by lighting the cutoff frequency of the HPF 18 by 2C is
inserted in series in the positive side wiring path line1 and the negative side wiring circuit line2.
The capacitor capacitance as a filter element is symmetrical between the positive side wiring
circuit line1 and the negative side wiring circuit line2.
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[0023]
The BPF 19 is a series circuit of a capacitor having a capacitance value of 2C multiplied by 2 and
a capacitance value of 2C multiplied by 2 and a value obtained by dividing the inductance value
of the coil L by 2 = L / 2. Are inserted in series with the positive side wiring path line1 and the
negative side wiring path line2, respectively, and the symmetry of the filter element is taken
between the positive side wiring path line1 and the negative side wiring path line2.
[0024]
In the LPF 20, a coil of a value of L / 2 obtained by dividing the inductance value of the coil L set
in light of the cutoff frequency of the LPF 20 by 2 is inserted in series in the positive side wiring
path line1 and the negative side wiring circuit line2. Similarly to the above, the symmetry of the
coil L as the filter element is taken between the positive side wiring circuit line1 and the negative
side wiring circuit line2.
In each filter, filter elements in parallel with the tweeter 12, the scorer 13, and the woofer 14 are
connected. The coil L is connected in the HPF 18, the coil L 2 in the BPF 19, and the capacitor C
in the LPF 20 as shown in the figure, so originally having symmetry of the current path, it is
necessary to divide the value Absent.
[0025]
In the above configuration, for example, in the case of the HPF 18, the current component of the
positive half wave of the driving power supplied from the main amplifier is input terminal 4 →
positive wiring path line 1 → capacitor 2 C → (tweeter 12, coil L) → It flows in the path of
capacitor 2 C → negative side wiring circuit line 2 → input terminal 5. The current component of
the negative half wave reverse to this is the path of input terminal 5 → negative wiring path line
2 → capacitor 2 C → (coil L, tweeter 12) → capacitor 2 C → positive wiring circuit line 1 → input
terminal 4 Flow.
[0026]
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As described above, since the drive current flow conditions are the same for the positive side half
wave and the negative side half wave of the drive power, symmetry of the reciprocating vibration
of the diaphragm of the tweeter 12 is obtained, and the amplitude of the input music signal is
obtained. It will be possible to convert it into an air pressure wave (i.e. sound wave) with a
corresponding amplitude. As a result, good music reproduction is possible. The operation
described above is the same as in the BPF 19 and the LPF 20, and can be easily understood from
the above description, so the detailed description will be omitted.
[0027]
Third Embodiment FIG. 4 shows a third embodiment of the present invention. This embodiment
discloses an example of a good network for a 3 WAY speaker system with -18 dB / oct
attenuation characteristics. The network is configured to include the HPF 21, the BPF 22, and the
LPF 23. The input terminals of the HPF 21, the BPF 22, and the LPF 23 are commonly connected
to the input terminal 4 and the input terminal 5. The output terminals 6 and 7 of the HPF 21 are
positive phase connected to the tweeter 12, the output terminals 8 and 9 of the BPF 22 are
positive phase connected to the squawker 13, and the output terminals 10 and 11 of the LPF 23
are positive phase connected to the woofer 14.
[0028]
Also in this embodiment, as in the first or second embodiment, the symmetry of the circuit in the
filter is taken. That is, in the HPF 21, each capacitor of the capacitors C1 and C2 set by lighting
the cutoff frequency of the HPF 21 multiplied by 2 = 2C1 and 2C2 has positive side wiring path
line1 and negative side wiring circuit They are respectively inserted in series in line 2 and
symmetry of capacitor capacity as a filter element is taken between positive side wiring circuit
line 1 and negative side wiring circuit line 2.
[0029]
The BPF 22 is obtained by dividing each of the capacitors of the capacitors C1 and C2 set in light
of the cutoff frequency of the BPF 22 by 2 and the inductance of each of the capacitors of the
2C1 and 2C2 and the coils L1 and L2 by 2 A series circuit (see FIG. 4) of each combination of
value = L1 / 2 and L2 / 2 is inserted in series with positive side wiring path line1 and negative
side wiring path line2, respectively, and positive side wiring path line1 The symmetry of the filter
element is taken between the and the negative side wiring path line2.
09-05-2019
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[0030]
Similarly, in the LPF 23, values obtained by dividing the inductance values of the coils L1 and L2
set in light of the cutoff frequency of the LPF 23 by 2 = L1 / 2, L2 / 2 coils are positive side
wiring path line1 and negative side The coil L is inserted as a filter element between the positive
side wiring circuit line1 and the negative side wiring circuit line2.
In each filter, filter elements in parallel with the tweeter 12, the scorer 13, and the woofer 14 are
connected. In the HPF 21, a coil L is connected, in the BPF 22, coils L and C 3 are connected, and
in the LPF 23, a capacitor C is connected as illustrated. Since these filter elements are connected
in parallel, they originally have current path symmetry, and there is no need to divide their
values.
[0031]
In the above configuration, for example, in the case of the HPF 21, the current component of the
positive half wave of the driving power supplied from the main amplifier is input terminal 4 →
positive wiring path line 1 → capacitor 2C1 → (coil L, capacitor 2C 2 shunt) → tweeter 12 →
capacitor 2 C 2 → (coil L, capacitor 2 C 1 joining) → negative side wiring circuit line 2 → flows in
the path of input terminal 5. The current component of the negative side half wave opposite to
this is: input terminal 5 → negative side wiring path line 2 → capacitor 2 C 1 → (coil L, capacitor
2 C 2 shunt) → tweeter 12 → (coil L, capacitor 2 C 2 joining) → positive side It flows along the
path of wiring circuit line 1 → input terminal 4.
[0032]
As described above, since the drive current flow conditions are the same for the positive side half
wave and the negative side half wave of the drive power, symmetry of the reciprocating vibration
of the diaphragm of the tweeter 12 is obtained, and the amplitude of the input music signal is
obtained. It will be possible to convert it into an air pressure wave (i.e. sound wave) with a
corresponding amplitude. As a result, good music reproduction is possible. The operation
described above is the same as in the BPF 22 and the LPF 23 and can be easily understood from
the above description, so the detailed description will be omitted.
09-05-2019
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[0033]
Fourth Embodiment FIGS. 5A and 5B show a fourth embodiment of the present invention. This
embodiment relates to the improvement of the attenuator inserted between the network and the
speaker. That is, the attenuator also has the same problem as that of the conventional network,
and the reproduced sound is cut off in the sense that the condition of the current path is different
between the positive side half wave and the negative side half wave of the drive power. It is as
stated earlier that there was an adverse effect such as badness of (see Fig. 7).
[0034]
In FIG. 5A, the attenuator ATT has a resistive element R1 whose negative end is connected to one
(positive side) of the output end of the filter and a negative end connected to the other (negative
side) of the output end of the filter R3, R2 disposed opposite to the resistance elements R1 and
R3, a slider 25 capable of sliding contact with the resistance elements R1 and R2 simultaneously,
and approaching and separating relative to the slider 25 R3 and A slide 26 which can slide on R2
at the same time has a pair of output terminals out +, out− to be connected from the slide 25
and 26 to the speaker.
[0035]
In a more specific aspect of this attenuator ATT, for example, a resistor element is disposed in the
form of a triple volume in which the resistor elements R1, R2, R3 are individually and
independently wound in a ring shape, and these resistor elements The sliders 25 and 26 fixed to
the rotation shaft are in sliding contact with each other while rotating in the opposite directions,
and a necessary resistance value is obtained by the sliding contact position.
Alternatively, the sliders 25 and 26 may be in linear sliding contact with each other.
[0036]
The sliders 25 and 26 interlock with each other, and when one approaches the other, the other
approaches, and conversely, when the other separates, the other moves apart. As a result, the
resistance value of the primary side of the attenuator as viewed from the output terminal side of
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11
the filter is always constant, and the value is maintained as R1 + R2 + R3 = CONST, thus
constituting a constant resistance type attenuator. Here, the resistance elements R1 and R3 have
the same resistance value after being adjusted by the sliding movement.
[0037]
In the above configuration, it is assumed that the predetermined adjustment amount is obtained
by moving the sliding positions of the sliders 25 and 26 for sound pressure adjustment. At this
time, the current of the positive side half wave of the driving power flows in the path of the
positive side terminal of the filter → the resistance element R1 → the resistance element R2 →
the resistance element R3 → the negative side terminal of the filter. Also, the current of the
negative half wave of the drive power flows in the opposite direction. Further, the shunt current
in the slider 25 flows in the path of resistance element R1 → slider 25 → out + → speaker → out
→ → slider 26 → resistance element R3 → filter, and the shunt current of the negative side half
wave is , This is the reverse direction of the path.
[0038]
Moreover, it can also be configured as an attenuator ATT shown as another embodiment in FIG. 5
(B). The attenuator ATT in the present embodiment is connected between the fixed resistor R1 /
2 connected between the positive end of the filter and the output terminal out +, and between the
negative output of the filter and the negative terminal out−. The fixed resistor R1 / 2 and the
fixed resistor R2 connected in parallel between the output terminal out + and the output terminal
out− are configured. The fixed resistors R1 / 2 and R1 / 2 have the same resistance value. In
this case, the positive and negative half-wave currents of the driving power flow in the same path
as in the case of FIG. 5A.
[0039]
As can be seen from the above, the circuit conditions of the current flowing through the
resistance elements as the constant resistances R1, R2, R3 or R1 / 2, R1 / 2, R2 maintain
symmetry on the positive side and the negative side of the driving power. The symmetry also
holds for the shunt current supplied to the speaker. As a result, since the drive current flow
conditions are the same for the positive side half wave and the negative side half wave of the
drive power, the symmetry of the reciprocating vibration in the diaphragm of the speaker is
09-05-2019
12
obtained, and the amplitude of the input music signal is accurate. Can be converted to air
compression waves (i.e., sound waves) corresponding to the amplitude. As a result, good music
reproduction is possible. In each of the above embodiments, the tweeter 12 has a positive phase
connection, the squawer 13 has a positive phase connection, and the woofer 14 has the same
connection configuration as the positive phase connection. The reverse phase can be configured
in any combination.
[0040]
As described above, according to the first aspect of the present invention, since the positive /
negative symmetry of the driving power waveform for the speaker in the dividing network can be
maintained, the reciprocating vibration of the diaphragm of the speaker can be obtained. As a
result, good music reproduction becomes possible. According to the second aspect of the present
invention, the supply condition of the current to the voice coil accompanying the switching of the
music signal is the same for the positive half wave and the negative half wave, and the symmetry
of the current path is secured. Therefore, in a speaker system including an attenuator that is
often used in combination with a dividing network, characteristic degradation due to the
attenuator can be prevented, and good music reproduction can be performed.
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