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DESCRIPTION JPH1022762

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DESCRIPTION JPH1022762
[0001]
The present invention relates to a timbre control device that realizes a low cost and high acoustic
quality sound device.
[0002]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
filter for emphasizing timbres for sound, which can achieve high effects with a minimum
component configuration. In general sound products, this is a field called tone control, loudness,
equalizer, etc.
[0003]
2. Description of the Related Art There are many types and variety of filters for controlling
timbres for sound. The basic principles of most filters are well known, but depending on the cost
and the degree of sound required, the filter structure and constants are chosen. In general, filters
requiring high performance are complicated in configuration and expensive.
[0004]
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[Problems to be Solved by the Invention] In recent years, in the field of producing acoustic
signals such as broadcasting technology and recording / reproduction technology, acoustic
signals have extremely high quality. Nevertheless, on the other hand, the sound quality of the
sound produced by speakers such as television sets is not good at all, as it is an audio product
widely used in homes. As for the reason, it can be evaluated that the cost for the speaker and the
structural constraints of the box in which the speaker is stored are the major factors. The
speakers and the speaker box that houses them determine the acoustic characteristics of the
acoustic device. Conventional filters can not cover the greatly degraded acoustic environment.
The present condition is that it is still at half tone correction. Competition for product sales in the
market requires cost reduction to an excess in the process of manufacturing products. The
present invention relates to a filter for enhancing the overall cost performance as an acoustic
device.
[0005]
[Means for Solving the Problems] A filter of characteristics obtained by approximately combining
the characteristics of both the second- and third-order low-pass filters and the high-pass filters,
an operational amplifier, and the degree of enhancement of low-pass high frequencies. By a
simple combination of resistor and input signal to be determined.
[0006]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The apparatus of the present
invention is connected to an audio system between a VTR and a television tuner.
The device of the invention is connected to the audio system between the CD player and the
amplifier. The device of the present invention is connected to an audio signal system such as a
game console. The circuit of the present invention is incorporated into a speaker with built-in
amplifier. The circuit of the present invention is incorporated in place of the tone control circuit
of the conventional audio device. The circuit of the present invention is incorporated into an
acoustic signal system such as an electronic musical instrument. Adjust the emphasis of the high
range low range with one volume. For simple sets, fix the bass and treble emphasis to a suitable
degree.
[0007]
[Function 1] It is possible to emphasize the low range and the high range in a manual manner
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with little influence on the mid range, so that it is possible to obtain a good sound quality with a
sharp feeling in both the low range and the high range.
[0008]
[Operation 2] Because the operation is one-dimensional, it is simple and suitable for persons who
are not familiar with the operation of electronic devices.
[0009]
[Operation 3] Since the circuit configuration is simple and the cost is low, it is suitable for
improving the sound quality of inexpensive products.
[0010]
Action 4: Increase the degree of freedom for the design of the speaker and speaker structure,
which is a major determinant of sound quality.
[0011]
[Embodiments] Second-order low-pass filters, second-order high-pass filters, third-order low-pass
filters, third-order high-pass filters, etc. The elements constituting the present invention are
already known. Although it is included in many books and is a rudimentary knowledge for those
involved in the manufacture of acoustic devices, a detailed description thereof will be omitted,
but this does not impair the essence of the present invention. .
Although practical circuit constants are shown in the circuit diagram of the present invention,
these constants are one example, and the constants themselves are not the essence of the present
invention.
[0012]
Gnd shows the reference potential in the explanation of the figure.
In the description of the figure, Input indicates the input terminal of the circuit of the present
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invention.
In the description of the figure, Output indicates the output terminal of the circuit of the present
invention.
In the description of the figure, Output_CM indicates the output terminal of the circuit that
determines the midrange characteristics. In the description of the figure, Output_CL indicates the
output terminal of the circuit that determines the characteristics of the low range. In the
description of the figure, Output_CH indicates the output terminal of the circuit that determines
the characteristics of the high range.
[0013]
In the figure, element symbols starting with R indicate resistors. In the figure, element symbols
starting with C indicate capacitors. In the explanation of the figure, the element symbol starting
with VR indicates a variable resistor. In the explanation of the figure, element symbols starting
with OP indicate an operational amplifier. In the explanation of the figure, the symbol starting
with FL indicates that the block is a filter circuit consisting only of passive elements. In the
explanation of the figure, the unit of constant of resistance is ohm, and k shows kilo. In the
explanation of the figure, the unit of capacitor constant is farad and u is micro. n represents
nano.
[0014]
In the explanation of the figure Freq. Indicates that the horizontal axis of the graph representing
the characteristic is frequency. In the explanation of the figure, “Gain” indicates that the
vertical axis of the graph showing the characteristics is the amplification gain. CM in the figure
shows the frequency-gain characteristics of the circuit that determines the sound quality of the
midrange. In the figure, CL indicates the frequency-gain characteristics of the circuit that
determines the sound quality of the low range. In the figure, CH indicates the frequency-gain
characteristics of the circuit that determines the sound quality of the high range. In the
explanation of the figure, CLH shows the frequency-gain characteristics of the circuit composed
of the bass and treble range filters. In the figure, CA indicates the frequency-gain characteristics
of the entire circuit. In the explanation of the figure, CA1, CA2 and CA3 are frequency-gain
characteristics of all circuits when the degree of sound quality enhancement in the low range and
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high range is changed.
[0015]
In the explanation of the equation, it is assumed that the function of the operational amplifier has
an ideal characteristic in the acoustic signal domain.
[0016]
Before describing the embodiments, well-known main circuits constituting the present invention
will be described.
5 is a typical inverting amplifier, FIG. 6 is a second order low pass filter, and FIG. 7 is a second
order high pass filter. FIG. 8 is a circuit diagram for explaining the essence of the present
invention. This circuit is an embodiment in which the circuit of FIG. 5, the circuit of FIG. 6 and
the circuit of FIG. 7 are approximately linearly added. Although the description is given for the
second-order filter, the third-order filter is basically configured on the same principle as the
second-order filter, so this description is omitted, but this impairs the essence of the present
invention. is not.
[0017]
FIG. 5 is an inverting amplifier with unity gain. The output of this circuit is the same size as the
input and is out of phase. The resistor Rg has little effect on the input and output gain of this
circuit. It is Ri = Rf. The frequency-gain characteristics of this circuit are shown in CM in Fig.9.
[0018]
FIG. 6 is a second order low pass filter with a maximum gain of about 30 times. The frequencygain characteristics of this circuit are shown in CL in Fig.9. The filter characteristics of this circuit
are determined by the circuit consisting of R1, R2, C1 and C2.
[0019]
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FIG. 7 is a second order high pass filter with a maximum gain of about 30 times. The frequencygain characteristics of this circuit are shown in CH of Fig.9. The filter characteristics of this
circuit are determined by the circuit consisting of R3, R4, C3 and C4.
[0020]
FIG. 8 is a circuit obtained by linearly adding FIG. 5, FIG. 6, and FIG. 7 and is a simplified bass /
treble emphasis filter that is the essence of the present invention. The circuit consisting of R1,
R2, C1 and C2 because the absolute value of the impedance in the low range of C1 and C2 of the
low-pass filter is negligibly small compared to the absolute value of the impedance of C3, R3, C4
and R4 The low-pass characteristic of the bass range of can ignore the effect of the high-pass
filter consisting of R3, R4, C3, and C4. The high pass characteristic of the high range of this
circuit is low because the impedance in the high range of C1 and C2 of the high range pass filter
is negligibly small compared with the absolute value of the impedance of C3, R3, C4 and R4. We
can ignore the effect of the passing filter. That is, the low band and high band of this circuit have
the CLH characteristics of FIG. Furthermore, when the CM characteristic is combined with the
CLH characteristic, it becomes the CA characteristic of Fig.14.
[0021]
The circuit consisting of R1, R2, R3, R4, C1, C2, C3 and C4 in FIG. 8 is the same as the circuit of
FIG.
[0022]
This circuit is a filter in which a second-order low-pass filter consisting of R1, R2, C1 and C2 is
superimposed on a second-order high-pass filter consisting of R3, R4, C3 and C4.
This circuit is the same circuit as the filter consisting of R1, R2, R3, R4, C1, C2, C3 and C4 in FIG.
[0023]
[Figure 2] This circuit has a third-order low-pass filter consisting of R1, R2, R3, C1, C2 and C3
superimposed on a third-order high-pass filter consisting of R4, R5, R6, C4, C5 and C6 It is a
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shaped filter.
[0024]
FIG. 3 is a circuit diagram showing an embodiment of the present invention.
The configuration of the circuit is the same as that of FIG. 8, and the circuit elements with the
same symbol in both circuits have the same function. FL1 is the filter circuit of FIG. 1 or FIG. This
circuit has the frequency-gain characteristics shown in Figure 11 CA. The emphasis of the bass
and treble band in this circuit is determined by the relationship between Rg and Rf because the
effect of Ri can be ignored. Cg is a capacitor necessary for the actual operation circuit, and has a
role of reducing the DC offset of the operational amplifier and a role of removing unnecessary
signal components in the very low frequency range. The role of Cg has nothing to do with the
essence of the invention. The circuit of FIG. 3 is suitable for an integrated product with a built-in
speaker.
[0025]
FIG. 4 is a circuit diagram showing an embodiment of the present invention. The basic
configuration of the circuit is the same as in Fig. 3. However, a variable resistor VR1 is provided
in series with Rg so that the emphasis of the bass and the emphasis of the treble can be
continuously changed in common. The elements with the same symbol in both circuits have the
same function. FL1 is the filter circuit of FIG. 1 or FIG. This circuit has frequency-gain
characteristics such that the degree of emphasis can be varied, as shown in Figure 12 CA1, CA2
and CA3. This circuit is suitable for optional products that can be connected between audio
devices consisting of independent devices such as speakers, amplifiers and players, and can be
adjusted to the desired sound quality.
[0026]
[General Description of the Invention] The essence of the present invention is a simple circuit
having a minimum number of components for combining the characteristics of the second or
third order low pass filter and the high pass filter. It is where it is. The reason will be described
using the circuit of FIG. 1 as a representative example.
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[0027]
Equation 1_1 is an equation representing the frequency-gain characteristic GM (jω) of the
acoustic frequency domain of the circuit of FIG. The gain is not dependent on frequency. The
characteristic CL in Fig. 9 shows the situation.
[0028]
The equation 1_2 is an approximate equation that represents the frequency-gain characteristic
GL (jω) of the circuit of FIG. ω is an angular frequency. As the frequency goes up, the absolute
value of GL (jω) approaches zero. The characteristic CL in Fig. 9 shows the situation. Formula 13 shows the relationship of (omega), R1, R2, C1, C2, Rg, Ri, T1, T2, T12.
[0029]
Expression 1_4 is an approximate expression that represents the frequency-gain characteristic
GH (jω) of the circuit of FIG. ω is an angular velocity. As the frequency decreases, the absolute
value of GH (jω) approaches zero. The characteristic CH in Fig. 9 shows the situation. Formula 15 shows the relationship of (omega), R3, R4, C3, C4, Rg, Ri, T3, T4, T43.
[0030]
Expression 1_6 is an expression representing the frequency-gain characteristic GA (jω) of the
circuit of FIG. Expression 1_7 is an approximate expression that represents the absolute value of
the frequency-gain characteristic GA (jω) of the circuit of FIG. The features of GL (jω) appear in
the low range, the features of GM (Jω) appear in the middle range, and the features of GH (jω)
appear in the high range. The approximation error of is large, but in the other areas, the
approximation of Equation 1-7 is fairly accurate. That is, GA (jω) is as shown in FIG. 11 and FIG.
When the superposition of these three characteristics is composed of a first-order filter, the error
becomes large, and the characteristics of the low range, mid range and high range do not appear
clearly.
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[0031]
Although the claims of the present invention do not mention the combination of the second order
filter and the third order filter, it can be easily inferred from the contents of the present
invention.
[0032]
The claims of the present invention do not mention many types of second order filters and third
order filters, which can be easily deduced from the content of the present invention.
[0033]
Although the claims of the present invention describe only the variable resistors in terms of
varying the degree of enhancement of timbre, it is easy from the contents of the present
invention that the function can be achieved by switching the resistors by switches. It can be
guessed.
[0034]
Although there are many types of second-order filters and third-order filters, it is possible to
construct a circuit having the same structure as the combination of the filter of the present
invention and the operational amplifier using a filter configuration which does not touch the
claim It can be easily guessed from the contents of the invention.
[0035]
[Effect 1] A low-cost, high-performance tone enhancing filter is realized.
[Effect 3] A low-cost, high-quality sound system can be constructed.
[Effect 2] The bass and treble can be commonly changed by a simple operation with one volume.
[0036]
Brief description of the drawings
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[0037]
1 is an embodiment of the filter unit of the present invention.
[0038]
2 is an embodiment of the filter unit of the present invention.
[0039]
3 is an embodiment of the present invention.
[0040]
4 is an embodiment of the present invention.
[0041]
5 is an exploded circuit diagram of an illustrative embodiment of the present invention.
[0042]
6 is an exploded circuit diagram of an illustrative embodiment of the present invention.
[0043]
7 is an exploded circuit diagram of an illustrative embodiment of the present invention.
[0044]
8 is a synthetic circuit diagram of the decomposition circuit of the embodiment for explaining the
present invention.
[0045]
9 is an operating characteristic diagram of the decomposition circuit of the present invention.
[0046]
10 is an operating characteristic diagram of the decomposition circuit of the present invention.
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[0047]
11 is a characteristic diagram of the embodiment of FIG.
[0048]
12 is a characteristic diagram of the embodiment of FIG.
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