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JPS56123196

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DESCRIPTION JPS56123196
Description 1, title of the invention
Speaker Device Network-
3. Detailed Description of the Invention The present invention relates to a network for a speaker
device in a multi-way speaker which divides a reproduction band into two or more and uses a
single speaker dedicated to each band. As shown in FIG. 1, the single screw force used in the
general purpose multi-unit single force device is disposed on the same baffle surface. Such a
multi-way speaker device has an advantage in that the directional characteristics of each single
speaker are not disturbed even by providing a plurality of single speakers because the baffle
surface is flat. However, the single speakers used in the multi-way speaker device have different
shapes and sizes depending on the playback band they have, as in the case of the bass speaker 1
and the treble speaker 2 in FIG. 1, for example. Therefore, the acoustic center (the position of the
equally constrained sound source) W + tt viewed from the side of the cabinet 30 is generally
not equal. For example, in Fig. 1, Itt> 1! , W. FIG. 2 shows the above relationship from the phase
characteristics of the two-way loudspeaker system. In FIG. 2, the horizontal axis represents
frequency, and the vertical axis represents phase. In the figure, 1 is a characteristic of the bass
speaker, and 2 is a characteristic of the high-pitched spur EndPage: 1-force. And since it is
assumed that 2t> 2 as mentioned above, the phase delay of the high-pitched speaker 2 becomes
larger than the phase delay of the low-pitched speaker 1, and the solid line of FIG. As shown in
the figure, a step-like phase characteristic is shown, and eventually the reproduced sound quality
is degraded. As a solution to this, for example, as shown in FIG. 3, it is considered to be arranged
such that the acoustic centers of the single speakers coincide with each other. The phase delay of
such a multi-way speaker apparatus corresponds to the group delay of each single speaker, so
that the characteristics of the VC1 bass speaker 1 and the high-tone speaker 2 become straight
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as shown in the characteristic of FIG. As shown in FIG. 3 and FIG. 3, each single speaker can not
line up on the same baffle surface, and such an arrangement degrades the directivity
characteristic of the speaker. The present invention has been made to solve the above-described
acoustic center problem, and by inserting a constant delay type low-pass filter in the network of
the speaker device while keeping the single speakers on the same surface as each other. It is an
object of the present invention to provide a speaker device network capable of electrically
correcting differences in acoustic centers and obtaining natural directivity characteristics and
sound quality.
Speaker Device Network-
Hereinafter, an embodiment of a network for a speaker device of the present invention will be
described based on the drawings. Prior to the detailed description of the present invention, first,
in order to facilitate understanding of the% characteristics of the present invention, FIG. The
structure of a conventional multi-way speaker apparatus having a band division circuit will be
outlined. In FIG. 5, the same parts as those in FIGS. 1 and 3 are described with the same
reference numerals. In FIG. 5, for the sake of simplicity, a two-way speaker device is illustrated,
or the same is true for the three or more speaker devices. In FIG. 5, the input signal is bandlimited by band division circuits 4, 4 'such as ± 6 dB10 ct + ± 12 dBloct, ± 18 dB10 ct, etc.,
and applied to each unit speaker, ie, bass speaker 1 and treble speaker 2. なお、3はキャビネッ
トである。 FIG. 6 is a block diagram showing the configuration of an embodiment of the speaker
device network according to the present invention. The same reference numerals as in FIG. 5
denote the same parts in FIG. As apparent from the comparison between FIGS. 6 and 5, in the
present invention, the difference from the conventional multi-way speaker device of FIG. 5 is the
delay circuits 5 and 5 'and the impedance correction circuits 6 and 6'. Is provided. That is, the
bass speaker, the beaker 1 and the high tone speaker 2 are disposed in the cabinet 3, and the
bass speaker 1 has an input signal divided into a band division circuit 4 'and a delay circuit 5'
impedance correction circuit 6 The input signal is supplied to the high-tone speaker 2 through
the band division circuit 4 delay circuit 5 and the impedance correction circuit 6. Here, since the
impedance correction circuit 6.degree. Turns the impedance of each single speaker to -ffK &, it is
used to make the constant resistance and operate the delay circuit stably. Therefore, it is not
necessary to include a nobi-dance correction circuit for the case where the impedance of a single
speaker is a constant resistance. In FIG. 6, assuming that the difference in distance between the
acoustic centers is Δt, since ΔQ = II 1-11 w (1), both The correction accumulation of the delay
time which makes the group delay of the half body speaker equal is 1g = ΔVc ························· (2) . If
Ig is added to the delay circuit -5 'for the bass cone speaker, the problem of the difference in the
acoustic center is solved, and both the half speakers can be kept at the same level. There is no
deterioration in directivity characteristics.
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In the case of this example, since it is not necessary to provide a delay time to the delay circuit 5
for the horn horn type sounder, the delay circuit can be omitted. Conversely, when Q, t <2w, the
delay circuit 5 'can be omitted because the center of the sound can be matched by giving a delay
to the delay circuit 5. In the case of 3 or more speaker devices, the delay time of each delay
circuit may be selected so that the sound centers of EndPage: 2 other single speakers coincide
with the sound centers of single speakers having the largest phase delay. By doing this, it is
possible to make the acoustic centers of the single speakers coincide with each other while
keeping the single speakers on the same buckle surface. Next, the contents of the delay circuits 5,
5 'will be described. The delay circuits 5 and 5 'used in the present invention are passive
constant delay type low pass filters composed only of reactance elements. This low-pass filter is
derived by giving a constant delay condition as a transfer function. Generally, in order to become
a constant delay at all frequencies, an infinite-side transectance element is required, but here,
from a practical standpoint A constant delay type low pass filter constituted by a finite number of
elements is used as a delay circuit. Now, assuming that the number of elements to be used is n,
the constant delay type low-pass filter used in the present invention has an anti-transfer function
Tr (S) as shown in the following equation, where S is a complex frequency. T1 (S) = S + 1 ·················
(3) Tz (S)-(S "+ 38 + 3) / ... ............ (4) Ts (S) = (83 + 682 + 158 + 15) b (5) Ts (S) = (S '+ 1083 +
4582 + 1058 + 105) / Io5-(6)' r, (s + = (S '+ 158' + 10583 + 42082 + 9458 + 945) 45 .. force T6
(S)-(S '+ 218') + 21 O 8 '+ 1 260 S' + 47 258 '+ 10 39 58 + 10 395) / 1 o 395 ........... (8) T?
(S)=(S7+288 +37885+31508 +1732583+62370S2+1
351358+135135)イ35135・・・・・・・・・・
(9)Ts(S)=(S +368 +63058 +593085+519758 +270
270SS+9459458 +20270258+2027025)/2027025−−Q
OITo(S)=(S +458 +99087+138608 −1″13513585+9
459458 +47297258 +1621620O8 +344594258+3445
9425)/3445g425・・・・・・・・・・01)T、。
(S) = (S10 + 558 '+ 14858' + 25740S '+ 31531586 + 28378358' + 1891890O8 '+ 9189180083
+ 3101348258' '+ 65472907) // 65472g075................ Constant delay filter with these transfer
functions. Actance element. 7 (a) to 7 (el) show examples of circuits easily configured with only
ladder circuits, for example, up to a negative lead. In FIGS. 7 (al to 7 (e)), R is a load resistance by
the delay circuit, and L is a reactance element. Further, ω0 is an angular frequency related to the
delay time tg, and both are connected by the following equation. .................... 0 In the example of
FIG. ... ... ... ... Q4), so ω. Finally, the constant delay type low pass filter can be constructed from
the element constants shown in FIGS. 7 (a) to 7 (e), which are calculated from the equation (7).
Next, calculation results of transmission characteristics, impedance characteristics and group
delay characteristics of the constant delay type low pass filter are shown in FIG. 8, FIG. 9 and FIG.
10, respectively. In each of FIGS. 8 to 9, the angular frequency ω is scaled by ω0, and is
represented by a scaled frequency X as shown in the following equation, and R is calculated as 8.
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x=c′)10)。 ... .............................. song (15) As for the group delay characteristic of FIG. 10,
tg = 1 (MSJ & ················································· Calculated as ae. Then, as the transmission characteristics
of FIG. 8 are understood from the group delay characteristics of FIG. 10, the constant delay type
low pass filter used in the present invention has a flatter frequency with a constant delay and a
high frequency band with constant delay as the number of elements increases. Expand to
wavenumber band. Therefore, when this constant delay type low pass filter is used as the delay
circuit of the low frequency speaker 1, the number of elements can be reduced. Conversely, the
number of elements increases when used as a delay circuit for a high-pitched speaker. In fact, in
the case of incorporating it as a network for a speaker device, the number of elements should be
the smallest, considering the reproduction band of a single speaker to be used. By the way, it is
when load resistance R is a fixed resistance that calculation of these materials is materialized.
However, as shown in FIG. 11 (a), the impedance of a general single speaker does not become a
constant resistance.
There is a need for a circuit to correct the impedance. EndPage: 3 FIG. 11 (b) approximates the
impedance of the single speaker by an equivalent circuit. In FIG. 11 (b), 7 is the impedance of the
voice coil, and 8 is the motional impedance. Voice coil impedance 7 is voice coil resistance Ru.
The motional impedance 8 comprises a parallel circuit of a reactance Cm, a resistor Rm and an
inductance 匍. And f shown in FIG. 11 (a). Indicates the lowest resonance frequency. For a single
speaker having such an equivalent circuit, the lowest resonance frequency f as shown in FIG. The
impedance can be made completely constant resistance by using the bottom resonance
frequency correction circuit 9 for correcting the resonance in the above and the high frequency
correction circuit 10 for correcting the voice coil inductance. However, each element constant is
divided from the following equation. R, = Ru (1 + Ru /) (, □) ·············································· ......... 0 barrel
C, = Lm / 1 (ut ......... ... ... ... ... a1 horse = Ru ... ················································ 2I) FIG. 12 (b) shows the
combination of the bottom resonance frequency correction circuit 9 and the high frequency
correction circuit 10 in FIG. L-2 (a) into one. At this time, the resistance R3 is calculated from the
following equation 12. R, -Ru "/ Rm ······························· Note that the impedance correction circuit 11
of FIG. Not limited to the example of), it is a matter of course that the constant resistance may be
determined according to the impedance characteristic of the single speaker 12 d. As described in
detail above, according to the network for a speaker device of the present invention Since the
constant delay type low pass filter is provided as a delay circuit in the network for the multi-way
speaker device, it is possible to give an arbitrary delay to each single speaker while keeping each
single speaker on the same baffle surface. Therefore, the difference in the sound center can be
easily corrected, and natural directivity characteristics and sound quality can be obtained.
4. Brief description of the drawings FIG. 1 is a view showing an example of the arrangement of
single speakers in a conventional multi-way speaker device, and FIG. 2 is a phase diagram of a
bass speaker and a treble speaker of the multi-way speaker device of FIG. FIG. 3 is a diagram
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showing characteristics, FIG. 3 is a diagram showing a conventional speaker device in which the
center is made to coincide with sound by shifting the arrangement of single speakers, FIG. 4 is a
diagram showing phase characteristics of the speaker device of FIG. FIG. 5 is a block diagram
showing a conventional network for a multi-way speaker device, FIG. 6 is a block diagram
showing the configuration of an actual dance example of the speaker device network according
to the present invention, and FIGS. e) each is a circuit diagram of a constant delay type low pass
filter used as a delay circuit in the speaker device network according to the present invention,
and FIG. 8 is a low pass of FIGS. 7 (a) to 7 (e). Characteristic diagram showing the relationship
between the normalized frequency versus response filter, Figure 9 is Figure 7 (a) to 1! 7 (e) is a
characteristic diagram showing the relationship between the reference frequency and the
impedance of the low pass filter, and FIG. 10 is a reference frequency versus group delay time of
the low pass filter of FIGS. 7 (a) to 7 (e). 11 (aJ shows an example of the impedance characteristic
of a single speaker used in the speaker device network according to the present invention, and
FIG. 11 (b) shows the network for the speaker device according to the present invention. 12 (a)
and 12) are specific circuit diagrams of the impedance correction circuit used in the speaker
device network of the invention of Reco. . 1 · Bass speaker, 2 · · · High tone speaker, 3 · · Cabinet,
4. . 4 '... band portion 111 circuit, 5, 5' pass · delay circuit, 6, 6 '... impedance correction circuit, 1
(· · · load resistance, 7 · · voice coil impedance, 8 · · · Motional impedance 9, bottom resonance
frequency correction circuit 10, high band correction circuit 12-single speaker In the figure, the
same reference numerals indicate the same or corresponding parts. Agent Shinno-EndPage: 4 Fig.
1 Fig. 2 Fig. 7 a) n 冨 1 b) n 冨 2 c) n = 3 d) nl I 4 e) n = 5 End Page: 5 Fig. 10 Reference Ihiha I n
1 Figure (0) (b) 7 EndPage: 6
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