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JPS5461901

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DESCRIPTION JPS5461901
Description 1, title of the invention
Transmission frequency characteristic correction device
3. Detailed Description of the Invention The present invention relates to a transmission frequency
characteristic correction device for correcting, in an audio reproduction system, a change in the
bass range due to a difference in the installation position of a speaker in a listening space.
Generally, the transmission frequency characteristics of the speaker in the listening room are
variously changed depending on the volume of the room, the type of the interior material, the
installation position of the speaker, the listening position and the like. The degree of the change
is small in the middle and high tones, and tends to be doggy only in the low tones. Moreover, its
variation feature is that it has a tendency for 100 to 400I (a large peak in the z-band, still having
a ding). As an example, FIG. 1 shows the change of the transmission frequency characteristic due
to the difference in the installation position of the speaker in the 6-mat room room. According to
this, it is understood that in the case of the installation position S of the speaker and S3, a large
dip or the like occurs in the band of 100 to 400 Hz. In such a case, although the sound is emitted
from the speaker at a uniform level, a noticeable excess or deficiency of bass occurs in the
listening position. The following remedies have been used for such problems, but both methods
have the following practical disadvantages. (1) A method of changing the installation position of
the speaker □ It is a convenient method that is also acoustically effective. However, it is difficult
to secure the optimal EndPage: 1 installation position of the speakers in our room, where the
room volume is small, and there are many cases where furniture or furniture is provided and
doubles as a room, or there are many room in Japan. It is powerful and practical. (2) Method of
removing harmful reflected sound It is also possible to remove acoustically harmful reflective
surface by absorbing sound to the wall where the reflected sound gives harmful level change to
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the frequency characteristic of the bass region. . However, in general, the sound absorption
method for the low frequency range often can not be used for general household sninogrooms
because it requires special acoustic materials and construction methods. (3) Method of Using
Graph Ink Equalizer A normal graph ink equalizer is capable of level adjustment approximately
every 1/3 to 1 A octave band. Therefore, there are various useful applications besides the
correction of the bass level. However, the price is high compared to audio equipment, and it is
hardly used in ordinary homes. (4) -7 Method using a control Generally, the tone control device
built into the audio equipment is oranged so as to adjust the increase or decrease of the level
with a certain cut slope as shown in FIG. There is.
Therefore, it is impossible to correct peak dip changes in the 100 to 400 l-1z band, which are
more likely to occur, in general lysin grooms. Therefore, as a device that corrects the change in
the low end of the bass range, the position and level of the center frequency of the peak dip can
be varied within a constant frequency range of the low range, for example, 1tJo to 400 Hz. The
inventor has devised a transmission frequency characteristic correction device configured using
a large peak-dip filter. This device is effective mainly for the correction of relatively gentle peak
dips, such as changes in the frequency characteristics of the bass region due to differences in the
installation position of the speakers. On the other hand, in a room surrounded by a rigid wall
such as a concrete wall, relatively steep peak dips due to standing waves may occur in the bass
region. In such a case, a correction device capable of changing not only the level of peaking and
the center frequency but also the bandwidth is desirable. Although some of the commercially
available graphic equalizers can change the position, level and bandwidth of the center frequency
of peak and dip independently, they are too expensive as a correction device of the transmission
frequency characteristic in the general purpose 7 ni. It lacks practicality. In view of the above, the
present invention is a transmission frequency configured using a napeak dip filter in which the
position, level and bandwidth of the center frequency of peak dip 0 can be independently varied
within a constant frequency band of a bass region. An object of the present invention is to
provide a characteristic correction device. An embodiment of the present invention will be
described below. FIG. 3 shows in a block diagram how the device according to the invention is
used. 1 is a sound source device such as an n-code player, a tape recorder, an FM tuner, 2 is a D /
A including an R, IAA characteristic equalizer etc., 3 is a transmission frequency characteristic
correction device according to the invention, 4 is a main anozo, 5 is a speaker is there. The
transmission frequency characteristic correction device 3 in the above configuration operates as
a peak-dip filter in a constant frequency band (for example, 100 to 400 Hz) of the bass region,
and further allows the position and level of the peak frequency and the dip center frequency to
be variable. Ru. A peak can be deleted by using the transmission frequency characteristic
correction device 3 as a dip filter approximating the inverse characteristic of the peak. If there is
a dip as in the speaker installation position S3, the transmission frequency characteristic
correction device 3 may be used as a peak filter.
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Therefore, by using the transmission frequency characteristic correction device of the present
invention, transmission frequency characteristics can be corrected without using an expensive
graphic equalizer as in the prior art. Furthermore, the transmission frequency characteristic
correction device 3 can also change the bandwidth. Therefore, the transmission frequency
characteristic can be corrected with high accuracy by adjusting the bandwidth as well as the
position and level of the central frequency of the peak dip EndPage: 2. Next, the transmission
frequency characteristic correction device 3 will be specifically described. The transmission
frequency characteristic correction device 3 is configured using a peak-dip filter. This peak-dip
filter is based on the principle that a peak-dip is generated by adding a signal whose phase
changes monotonously at O to −2π (Tunano) 1 depending on frequency and a signal having no
phase change. Based on. FIG. 4 shows a block circuit of the peak-din-sync filter. Jl is an adder, 12
is an attenuator, 13 is an adder, 14 is a all-pass filter circuit that changes the phase of the input
signal monotonously to O to -2π radian with increasing frequency, 15.16 is an adder, 17 Is the
antenator. As shown in the figure, between the input terminal IN and the output terminal OUT,
the output terminal of the attenuator 12 is connected to the negative input terminal of the adder
11, and the output terminal of the adder 11 is the second positive of the adder 15. The output
terminal of the adder 15 is connected to the input terminal via the attenuator 17 and the
negative input terminal of the adder 13, and the output terminal of the antenna 17 is connected
to the second positive input terminal of the adder 16. The filter circuit 14 can be easily
configured, for example, by cascade-connecting two CR bridge circuits as shown in FIG. 5 VC. In
this CR circuit, resistors R and R2 having the same resistance value are inserted in series on
positive and negative signal lines' 9 ++ 192, and the input and output sides of the resistors R1
and R2 have the same capacitance value. 7Circle C, and C2 are connected and connected.
Hereinafter, the peak-dip filter configured using the CR and Brythno circuits will be described.
The transfer function P of this peak-dip filter (.fwdarw. And the amplitude ring IP ((b) 1) are
respectively shown in the following equations. IP (ω) 1-where α and β are input / output level
ratios of attenuators 12 and 17, O O α, β 1. T is a time constant of the CR circuit. The
characteristics of peak dip obtained by this peak dip filter are as follows.
(]) The amplitude characteristic is symmetrical on the logarithmic axis, and has an extremely
thick value / minimum value of peak dip 0 at the ω-convolution. (2) If α> β, a dip will occur,
and if α <β, a peak will occur. If β is constant or constant, the dip is deeper as α is larger, and
if α is constant, the peak is higher as β is larger. (3) The bandwidth can be varied by properly
combining the values of α and β. FIG. 6 shows an example of the amplitude characteristic when
only the bandwidth is changed with the dip depth fixed. The numbers in 0 indicate that the
former is α and the latter is β. The band width is shown by using fO + fl + f2 shown in FIG. 7. In
FIG. 8, an isolevel curve obtained from the combination of α and β is shown in FIG. 8 and an
isobandwidth curve is shown in FIG. Further, in FIG. 10, the equal level curve is indicated in
parallel by a solid line, and the equal bandwidth curve is indicated in parallel by a broken line. It
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is sufficient to set the input / output level ratio. For example, in order to obtain a dip
characteristic having a depth of 6 dB and a bandwidth of 1.0, α should be 0.48 ° β be 0.18,
from the intersection shown by · in FIG. In FIG. 8, FIG. 9, and FIG. 1O, the iso-level curve and the
iso-bandwidth curve can obtain dip G field characteristics. For example, to obtain the abovementioned dip and \ * ':;, (symmetrically, the peak characteristic EndPage: 3 which is 6 dB in
height and 1.0 in bandwidth, α is 0.18.β is 0.48. You should do. FIG. 11 shows the
characteristics of peak ditno obtained by the combination of α and β. The upper number is the
level, and the lower number is the bandwidth. Fig. 12 shows α for defining the level of peak dip
and bandwidth. An example of a combination of values of β is shown. FIG. 13 shows the result of
correcting the transmission frequency characteristic in the listening room using the transmission
frequency characteristic correction apparatus of the present invention. The solid line is the
characteristic before correction, and the broken line is the characteristic after correction.
According to this, it is possible to easily correct the steep peak occurring in about 80 to 120 H 2
band. Therefore, as described in detail, the device of the present invention can change the
bandwidth as well as the position and level of the center frequency of the peak dip within a
constant frequency band of the bass range. Therefore, by using this device, it is possible to
accurately correct the change in the bass range of the transmission frequency characteristic
based on the difference in the installation position of the speaker and the like. Moreover, this
device can be manufactured at a significantly lower cost than a graphic equalizer, and is practical
since it can be built in as many as the cost of the audio equipment itself is increased.
In addition, even as a single product, it can be used as a laughable and effective bass tone
adjustment device. In addition, L and R by applying independently to both chano and L
respectively. It is possible to easily correct the difference in the level of R between the two radio
channels produced in the low frequency range due to the difference in the conditions of the
reflective surfaces around the two R speakers. In addition, by appropriately selecting and
changing the circuit constant, the present invention can be applied to the sound quality
adjustment device for the middle range and the high range, and thus has the effect of becoming a
dog.
4. Brief description of the drawings FIG. 1 is an illustration of a change in transmission frequency
characteristics according to the installation position of a speaker, FIG. 2 is a characteristic
diagram of a tone control device, and FIG. 3 is a transmission frequency characteristics
correction device according to the present invention 4 is a block diagram showing an
embodiment of the device of the present invention, FIG. 5 is a block diagram of a CR bridge
circuit, and FIG. 6 is a diagram in which the depth of dip is made constant. 7 is an explanatory
diagram of bandwidth setting, FIG. 8 is an equal-level curve, FIG. 9 is an equal-bandwidth curve,
and FIG. 10 is an equal-level curve. Figure 11 shows the same bandwidth curve together, Figure
11 shows the values of the level and bandwidth of the dip and dip determined by the
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combination of the input and output level ratios α and β, Figure 12 shows the peak · · · A set of
α and β values to determine the dip level and bandwidth ill showing the Align, FIG. 13 is a
diagram showing a correction example of a transmission frequency characteristic by the
apparatus of the present invention. 3 · Transmission frequency characteristic correction device,
12 · · · Attenuator 114 · · All band pass filter circuit, 17 · · · Attenuator 0 EndPage: 4
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