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DESCRIPTION JPS56131295 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 09-05-2019 1 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 09-05-2019 2 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 09-05-2019 3 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 omitted. 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 09-05-2019 4 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: ? 09-05-2019 5

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