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Description 1 In the speaker system according to the present invention 2 or more speaker
systems, at least one of the speakers that receives a band other than the highest band of the
speaker system is a diaphragm or a membrane Using a speaker that eliminates the effects of split
imaging, movement, or the effects of diaphragm or membrane split vibration on the band
required for the speaker system, and is adjacent to the reception band of the speaker For a
speaker that has a full reception in the frequency band, a high-pass filter circuit that has a highpass filter circuit with a cut-off characteristic of 20 dB / decade, and a high-pass filter circuit to
suppress its lowest resonance isostatically lower. Drive a speaker or use a speaker with low
resonance peel and cut off the speaker by 20dB / decads Characterized Tosuru multiway speaker
system to be driven through the high-pass filtering circuits with. This invention relates to a multiway speaker for the purpose of high fidelity reproduction, and its crossover characteristic can be
regarded as 40bB / decade . Conventionally, for example, crossover theory of high and low two
frequency bands in a multi-way speaker system is established in the network alone, but theory
including characteristics of the speaker is hardly established. This is because the characteristics
of the speaker are complicated and can not be expressed by mathematical expressions.
Therefore, the conventional speaker system has a disadvantage that the designer arbitrarily
configures the circuit, so it is not possible to know which system's reproduced sound is close to
the original sound and can not know the direction of improvement. Recently, the division
vibration is eliminated by appropriately adjusting the distribution of the force driving the
diaphragm or the diaphragm, or appropriately driving each node of the free vibration of the
diaphragm or the imaging table. Or Svy EndPage that makes it possible to ignore the shadow 41
of the vibration plate or film + vibration 41 for the band required for the speaker system:
extremely simple frequency of flat sound pressure frequency characteristics except for low
frequency There is a tendency to try to put a speaker with characteristics into practical use. The
present invention uses such a loudspeaker and, for a loudspeaker that receives a frequency band
adjacent above the reception range of the loudspeaker, in order to keep the loudspeaker
equivalently lower in resonance resonance at its lowest resonance. Drive through an electrical
circuit and a high pass filter circuit with a cutoff characteristic of 20 dB / decade, or alternatively,
using a speaker with an appropriately low co-pickup detachment, and cut off the loudspeaker by
20 dB / decade A speaker system capable of high fidelity reproduction is obtained by driving
through a high-pass filter circuit having characteristics.
The present invention will be specifically described below according to an embodiment shown in
the drawings. FIG. 1 shows an embodiment of a two-way speaker system according to the present
invention. 1 is a woofer, this woofer does not have divided motions in its diaphragm or film, or
even if there is one division vibration, its frequency is sufficiently high, and the woofer 1 is
driven through a low pass filter circuit. The influence of the divided vibration on the frequency
characteristics of the band necessary for the speaker system can be neglected depending on the
respective applications. In these cases, as the speaker system, the high-frequency sound pressure
frequency characteristics of the woofer may be considered to be flat, so the high-frequency
characteristics of the woofer and its circuit are the characteristics of the low-pass filter circuit.
You just need to decide. In addition, it is a 26-1) week in FIG. 1, and in order to simplify the
explanation here, its electroacoustic conversion efficiency or efficiency is made identical to that
of the woofer. About the lowest resonance of the vibration system of Twita 2. By electrically
suppressing the input signal to the tweeter, centered on the lowest scratch frequency, if it can be
regarded as the same as that of a single resonance. It is possible to obtain equivalently less
desirable values of resonance debonding. Of course, in the case of a tow eater with a small
minimum resonance peel that is desirable from the beginning, there is no concern about keeping
the input signal centered on the minimum resonance frequency. As described above, it is possible
to design a crossover circuit which takes into account the effect of the lowest resonance of the
speaker, here the towtor, in a reasonable manner. Of course, the characteristics are only
approximations in comparison to those that are theoretically correct. First, in the present
invention, the non-approximated crossover theory will be described. It is assumed that the
transfer function Ti of a speaker receiving an immediately lower band at a certain crossover
frequency fi can be expressed by the following equation. T = ? и и и и и иииииииииииииииииииииииии (1) '(1 + jy)'
Here, T, the speaker system It is assumed that the transfer function from the input terminal of to
the point of the radiated sound field of the speaker However, the propagation time is ignored.
Also, y is the ratio ? / ? 1, ? is the angular frequency, and ? 1 is the first crossover angular
frequency. In addition, it is assumed that the same crossover frequency f, the immediately upper
upper band full-supporting speaker, here the transfer function T of the tweeter 2 of FIG. 1, can be
expressed by the following equation. Here, T is a transfer function from the input terminal of the
speaker system to one point of the radiated sound field of the speaker, and the propagation time
is ignored.
Furthermore, here, the input terminal of the speaker system refers to the input terminal of the
crossover circuit. When the difference between T1 and T is obtained, the absolute value of the
transfer function difference becomes constant over the entire band as follows. EndPage: 2 Next, a
method for specifically realizing the above-described operations approximately will be described.
T is equal to (1 / (1 + jy) 2), as indicated above. This characteristic can be realized, for example,
by only the circuit from the input terminals 9 and 10 in FIG. 1 to the woofer 1 when the
characteristic of the speaker can be considered flat. In FIG. 1, 6 is an inductor, and its impedance
is j?L3. Reference numeral 5 denotes a register whose resistance value is R5. A capacitor 6 has
an impedance e1 / j?C6. The resistor 5 and the capacitor 6 are elements for making the
impedance seen from the boundary 7 constant resistance since the impedance seen from the
boundary 4 to the right is not a constant resistance. An inductor 8 has an impedance of j?L8.
Now, the impedance measurement resistance R0 of the woofer 1 is set. The impedance of the
speaker is generally not constant resistance, in which case it is well known in the circuit
technology to make this constant resistance. ???? R, Mi R 8 ииииииииииииииииииииии (6) The transfer
function between the input end +1 is equal to the equation (1) as the following equation (8). Next,
T u is equal to the square of 1 / (1 + 1 / j7). This 1 / (1 + 1 / jy) characteristic can be realized by
the circuit from the input terminals 9 and 10 to the boundary 18 in FIG. However, it is assumed
that the impedance looking to the right from the boundary 18 is a constant resistance R0. It is set
as the impedance '& 1 / j?CIF of the capacitor 19 and C5, = ? .............................................. (9) If ? i
R 0, then the transfer function T n j from the input terminals 9 and 10 of this circuit to the
boundary 18 is: Next, the low-pass transfer function T of the loudspeaker itself which receives
the band immediately above the resonance frequency t1. Assuming that ? ? ? can be
considered to be the same as a function representing the characteristics of ? -resonance, here Q.
J is the lowest resonance decapsulation of tweeter 2. ) '[Li is ? / ?. The ratio is ?. , Is the lowest
resonant angular frequency. ????????????? Here, some equivalent resonance
dendrites smaller than sQOj are Qo3 + Qo3 equivalently Q10.
If it can be suppressed to <1, it can be considered that the same curve as equation 1 / (1 + 1 / j3
') is exaggerating above the frequency of + y64 = Qoj. ????? ??????????????
???????????? It is particularly desirable to be 1/3 to 1/4 or less. Qaj of 172 or
more is undesirable depending on the application. Anyway, I was torn. Therefore, 1. . To can be
considered to be approximately equal to T. That is, EndPage: Q as described above. The value of
is a desirable, less contagious molt said here. Thus, only if sQo3 itself is the desired resonant
declination, there is no need for a circuit to suppress it all electrically. When there is a need to
keep the input signal of the tweeter 2 smaller than the lowest resonance frequency, the elements
therefor are the capacitor 11, the equivalent resistor 12, and the inductor 15 of FIG. After
connecting them in parallel, they are connected in series with the tweeter 2. Then, assuming that
the resistance value tR + 2 of the equivalent register 12 is obtained, Here, Ro is a resistance value
when the impedance of the tweeter 2 is a constant resistance. ?????? Is the lowest
resonant frequency of the tweeter. Here, it is desirable to select the ratio fs / fo5 'as much as four
times or more. ?????????????????????????????? ??????
???????????????????????? Since the impedance seen from the
boundary 14 in FIG. 1 to the right is not a constant resistance, the series 7 circuit consisting of
the inductor 151 equivalent resistor 16 and the capacitor 17 is connected as shown in FIG. The
impedance seen is made to be a constant resistance R0. For that purpose, assuming that the
inductance of the inductor 15 is LIS, L + s = C + iRo 2 ииииииииииииииииииииииииииии Assuming that the resistance
value is Rlb. ????????????????????????????? ??????? If
so, is it a terminal? And 10, the input impedance of the speaker system is a constant resistance
R8. In the case where the acoustic radiation impedance of the diaphragm of the woofer 1
increases in proportion to the square of the frequency in the low region and becomes a constant
resistance in the high region (for example, a piston disk in an infinite baffle) In the case of mass
control of the vibration system, the radiated acoustic energy falls in proportion to the frequency
above and below the critical frequency which changes due to the nature of the acoustic radiation
impedance, so that the critical frequency and the crossover frequency coincide with each other. If
this lowering characteristic is used, the resistor 5, the capacitor 6 and the inductor + 1 can be
However, in the case of an infinite, full piston disk, the radiated acoustic energy characteristics of
the speaker system are not completely flat but only approximately flat. Further, in this case, the
sound pressure frequency characteristic in the direction directly in front of the diaphragm rises
at a part of frequencies due to the influence of the directivity characteristic. The characteristics
of the equation (1) can be realized by replacing the inductor 8 and the like of FIG. 1 with the
circuit of FIG. In FIG. 2, 1 is a woofer, the impedance of which is also a constant resistance R8,
and the impedance of the canopy 20 is 1 / j?C2o1 and the impedance of the integrator 21 is
j?L2 +,. ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии ? ?
? ? ? ? ? ? ? ? ? ? with EndPage: 4 as C20 ? ? becomes equal to Expression (1).
However, in this case, ?input terminal? The input impedance of the speaker system seen from
the point of 10 and 10 does not become a constant resistance. For loudspeaker systems with
more than 6 windows each, for one crossover frequency, for a loudspeaker that receives the band
immediately below it, treat it just like the high frequency of the 2-way woofer 1 above. Similarly,
the low band of the tweeter 2 may be treated as a speaker that receives the band of. In any case,
the degree of contribution of each circuit element to the total frequency characteristic is not the
same, so if strictly correct characteristics are not required, it is possible to reduce some of the
elements whose contribution is small. Also, other circuits, such as a combination with an
attenuation circuit, are possible as long as they do not substantially disturb the characteristics.
Also, the order of connection can be changed as long as the operation of the circuit can be
secured. Also, although the illustrated one is a so-called series branching circuit, the so-called
series branching circuit can be designed according to this. Also, although the illustrated one is a
passive circuit, an active circuit may be used. When using an active circuit, the degree of freedom
to omit the constant resistance circuit or to change the connection order is increased. As
described above, according to the present invention, the lowest resonance of the speaker can be
rationally incorporated into the design, and it can be suppressed to an equal constraint by a
temporary circuit, and can be combined with the conventional circuit. If there are as few
speakers as possible with one resonance or at least near other resonances and other possible
disadvantages, then measure the lowest resonance frequency and the lowest common dust
removal and design the circuit based on the measured values. By making it possible, the objective
high fidelity characteristics can be realized without any trial and error.
4. Brief Description of the Drawings FIG. 1 is a circuit diagram of an embodiment of a speaker
system according to the present invention, and FIG. 2 is a circuit diagram of another embodiment
of only the woofer portion of FIG. ??????????????? Attorney Attorney Attorney
1) Toshiyuki EndPage: ?
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