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Description 1, title of the invention
3. Detailed Description of the Invention The present invention relates to the improvement of a
loudspeaker system. In order to faithfully reproduce the waveform of the l signal, the sound
pressure characteristic of the speaker is flat and the phase characteristic also becomes the
frequency over the entire frequency band where the signal spectrum is distributed. It must
change in a straightforward manner. The present speaker can obtain a substantially flat sound
pressure note in the OI listening band, and one condition of faithful reproduction can be said to
be technically solved. With regard to the other conditions of phase * river linearity, a speaker
system called a linear 7 AIDS speaker or a uniphase speaker has recently been developed, but
these have some drawbacks. It is a reality. In order to realize the phase property (a speaker
whose raw changes linearly with respect to frequency (hereinafter referred to as a linear phase
speaker), in the case of a two-uniss becan stem, the filter authenticity and the speaker's own
waiting 1 Let GL (1) be the transfer function of the low-pitched portion, and let GL (1) and GH (1)
satisfy the following equation, where GB (1) is the transfer function of the quotient sound
portion. ot, tf +-1 / (1 + j (// 10))---..., 1ll GH (f)-j (// fo) / (1 + j (// 10))----= f21 Note that fo is the
crossover frequency] The total transmission custom order at this time is G (Ha = GI 47) + GIitf) =
1 ... (3) The phase is zero over the phase. )であり、リニアフェイズスピーカとなる。 In fact,
since + and-low limits are limited to the nature of the speaker to be used, +31 expression is
completely realized (although the key is not used, it is almost (3) over most of the used band) It is
possible for the equation to hold. Next, in the case of 3 ways, the transfer functions of the 1's
sound part, the top part and the chorus part are GLI /), (JMtf) and GH (1), respectively, Gt (car 1 /
(ICf / foP + j− 2-ζ- (1110 Mon---+ 410 M (/ 1 l-j-2 · · · (// 10) / (1 (// f Q) 2 ÷ 3.2 · ζ-C f / f O))
+ 5) Go (F) "<flfo" '/ (ICf / fo) "+ j 2-2 · (flfo month (61 (Fat, fo is a crossover frequency, and ζ is a
second order damping factor. In this way, the overall waiting time Gt /) is Gt /) "= Gl-(fl + GMLf) +
GPIf force = 1-... (7), and the linear phase speaker is the same as" two-way easy " It becomes.
In this case, too, the equation (7) can not be completely realized due to the speaker eye-body
waiting low region and the upper region limit, or approximately +71 expression is satisfied in
most of the 1 historical territorial area Although the above-mentioned method is representative
of realizing the current near-phase loudspeaker, the biggest drawback of these methods is that
transmission custom-made can be seen in fil, t2 + or (5) respectively. It has a gentle slope of 6 dB
/ act in the cut-off frequency range of The present invention seeks to obtain a linear phase
loudspeaker which overcomes the above-mentioned drawbacks of the prior art methods. A
speaker that shares each band in the speaker system is inherently more advantageous in terms of
input resistance, distortion characteristics, efficiency, and the like if waiting for a sharp
attenuation vf vinegar as much as possible outside the use band. The present invention makes it
possible to obtain nearly linear phase characteristics even by combining low and high band% l '4
E with a slope of +12 dB / act. In the following, for the sake of simplicity, the two-work method
will be described. The low frequency limit of the low sweat characteristic is determined by the
low frequency characteristic of the speaker itself. Let this be GLL (1), which is represented by the
following equation. GLL (f) = (f / / LL) (1 (/ / fLL) + j · 2 · GLL · (/ / fLt month ... ... (8) (where fLL
is the lower limit frequency of the speaker, GLL Is the damping factor) The high frequency limit
of the low-pass characteristic is determined by the characteristic GL of the low-pass filter, If the
1st application of the well-smooth force of the spread of the sieve area It shall be expressed by
the following formula. GLH (f) -1 / (1- <flfLH) "+ j 2 · GLH. (FlfLH)-+91 (where, fLII is the cut-off
frequency of the filter and GLH is its damping factor, and fLH has a speaker stem) The low-pass
limit of the high-pass custom-designed near the cross-oral <-frequency is determined by the
characteristic GHL (1) of the bypass filter if the low-pass speaker with good growth in low-pass is
used. -, &, GHL (f) = (// fut) '/ (1 (171m)) 2 + j · 2 (mVcf / kJ) , / 1 (L is the cut-off frequency of
the filter, ζ HL is its damping factor, and fHL is chosen near the crossover frequency of the
speaker system) A custom-made GHH (C It is determined at the high-band limit frequency of the
speaker, but this is assumed to be expressed by the following equation.
GI (H (f) = (flfnu) 2 / (ICf / fnuP + j 2 · (HH · (/ / fHH)) · · · · · · · · · · · ·) 11) (where jun is the upper
limit of the speaker The frequency, ζHH, is its damping factor). Note that fLL, / Lll − / IIL and
fuH are chosen to satisfy the following equation. fLL <it, □) f 肚 (f ・ · · · · · · · · · · · Comprehensive
characteristics G when these characteristics are combined (C is expressed by the following
equation. G = GLL-GL) I + GHL-GHH... 03 (However, for the sake of simplicity, (1) indicating that it
is a function of frequency) is omitted. 2.) When the condition of the equation is satisfied,
crossover page EndPage: near two wave numbers (/ LH, / ML), both GLL and GHH are
approximately 1, and GLH and lN1L have almost the same amplitude, and close to 1808. Since
there is a phase difference, a large drop occurs in sound pressure% injection in this as-is
combination. Therefore, as a feature of the invention, the polarity of the high-tone speaker is
made to be the reverse of the outgoing speaker. By this, it can be made to be substantially in
phase near crossover frequency. The overall note at this time is as follows. G = GLL-GL) (-Gat-G +
a + ..- d.phi.) By this, it is possible to make the sound pressure approximately -P- in the vicinity of
the crossover frequency, but the phase characteristic still does not become linear. This is because
the bass speaker is effectively positioned rearward since the amount of delay caused by the
transmission characteristics of the low heel portion and the high sweat portion is large in the
bass portion. As another feature of the present invention, in order to solve this problem, the
delay characteristic is added to the transfer characteristic of the active sound section. The
transfer function when the delay amount is 1 o is as follows. G = GLL-Gt, o-GHL-GIIH-e-) (2xtoW
,,,,,,,,,,,,,,,,,,, 1511, the amount which gives the phase delay of about 90 ° at the crossover
frequency is excessive . The result of the old-fashioned transfer function when using the
constants shown below as actual numerical calculation (1) is as shown in FIG. In FIG. 1, the
horizontal axis is scaled on a linear scale with the circumference e and the number, and the
vertical axis shows the vibration characteristic IG + and the phase characteristic (1), but the
amplitude characteristic is +1.25 dB, -1, It falls within 2 dB and can be said to be a substantially
flat characteristic as a speaker. The phase characteristic shows a sharp phase lead in the
subrange, which is due to the low band limit in front of the speaker.
150) At f and higher frequencies, the phase characteristic is almost linear and can be called a
linear phase speaker. FIG. 2 shows the transfer functions GLL and GLH of the bass part according
to the present invention and the transfer functions GHL-GHH of the treble part 'i'1iitW! It is
shown that the j characteristic is shown together with the lossiness characteristic of the (d)
equation, and that the bass and high temperature characteristics are attenuated at +12 dB / □ ct
at the crossover frequency. There are two methods for providing a delay time to, a method using
an electrical delay circuit, and a method for arranging a sound speaker behind the bass speaker
by a distance do given by the following equation. do = to-c----t17 (however, C is high-speed)
Assuming that C = = 340 m / sec in the constant example shown by the US formula, d.
=8.51となる。 As described above, according to the present invention, it is possible to
realize a linear phase speaker using a network of filter temporaryity (± 12 dB 10 ct, 1) of the
secondary element, and high quality quality can be achieved. It is needless to say that the present
invention can be similarly applied to a speaker system having three or more windows. ′
4. Brief Description of the Drawings. FIG. 1 is a diagram showing an example of calculation of
sound pressure and phase characteristics according to the embodiment of the present invention,
and FIG. 2 is a diagram showing bass characteristics and treble characteristics at that time. Agent
Tono Shin-EndPage: 3
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