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JPS5689194

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DESCRIPTION JPS5689194
Ming, 1 case i 1, name of invention
2nd note, button single-directional microphone system 2 claim 1 [one-directional microphone
Uninoto? In the means for achieving secondary sound pressure gradient single-directivity by mcharging 21 microphone units among the seven microphone units, the above 2 (solid
microphone units in the sound source direction) The microphone unit oil is directed at a
predetermined distance, spaced one to another, and either one of the output circuits of each of
the two microphone units is inserted into the Nei-Pass filter, and the bypass filter is inserted. The
second sound pressure gradient monotonous directional microphone 7 stem characterized in that
the output passed through and the output of the other microphone unit are divided by 1 so as to
subtract.
3. Detailed description of the invention Nowadays, so-called ? production and the like are
actively performed by the side of amateurs, and by the spread of so-called sound 8m, VTR
camera, etc., the camera drawing and face are met Recording has become desirable. For example,
according to the zooming of the screen of the Vl ?R camera: Sounds other than the recording
purpose: Ari, the rule of the variable directional microphone / stem to improve the S / N of the
sound to be recorded and the brightness of the sound.? ? Ii is rare. Furthermore, even for one
of recording enthusiasts, conventionally, a means of using a so-called gun microphone
(superdirectional microphone) with a long dimension or a so-called parabola has been taken as a
means for recording distant sounds with good S / N. A microphone having directivity of such a
small angle and W, and an I-shaped one is required. From such a demand, it has a small size and
a narrow angle directivity. In order to realize a superdirective microphone, as a prior art, there is
a microphone 7 stem having a secondary sound tuning single directivity. This microphone
system is also the most basic to achieve secondary sound pressure gradient uni-directionality,
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EndPage: 1, but has some drawbacks. That is, as will be described later, since the reduction is
greatly amplified by the equalizer, the noise in the low band is increased, and '! It is to be
vulnerable to noise. The object of the present invention is to create a microphone system that is
strong against one low sound or noise as described above, while making use of the secondary
sound sensibility single directivity (superdirectivity). It is to be. The block diagram shown in FIG.
1 is a block diagram of a conventional secondary sound pressure ? i uni-directional microphone
system, which comprises microphone units 1 and 2 having a directivity of noon and a
microphone main axis X with respect to a sound source S. Point each one at a specified 1 ffi
interval Df: Place and place. For these microphone main shaft 1) 1, 2 u 2 impressions, same wave
number time characteristics, and: for the daily characteristics, select the ones that are often
numbered with each other. In addition, the arrangement interval of these microphone units 1 and
2 defines the use band of the secondary sound IE gradient uni-directional microphone system,
and as will be described later, this interval Produces a dip (valley) at the frequency of the sound
that is primary. It is connected to pass through to the output cover subtraction circuit 3 of the
microphone units 1 and 2 above. The output of the subtraction circuit 3 is a characteristic having
a 5-term slope in which the gain drops by 6 dB with respect to one octave as the frequency
decreases in the low band, as in the frequency characteristic shown in the fourth column. As in
the above, dips occur in the characteristics at the frequency of the sound in which the
arrangement intervals of the microphone units 1 and 2 coincide with the wavelength of the
sound.
Therefore, in order to make the characteristic through the subtraction circuit 4 squarely correct,
it is necessary to pass through the equalizer 4 having the characteristic opposite to the toxicity
curve in FIG. The output signal passing through this equalizer 4 is substantially on the frontal
axis (0 ░) of the sound wave in a frequency band ?? within the band limit at which the
arrangement interval of the microphone units 1 and 2 is not equal to the wavelength of the
sound. As the characteristics, as shown in FIG. 2, it is possible to obtain the same frequency
characteristics as the above-mentioned respective microphone units 1.2 having unidirectionality.
Fig. 2 shows the secondary sound IIE gradient single-finger homosexual microphone / sdem, the
number of main units of a typical J microphone unit that comprises A, and Fig. 43 shows the
directivity of a unidirectional microphone. It shows the af. The four houses described above can
be represented by the following equation. 1 Here, E: Output of the second term GE term 1
distortion uni-proactive microphone a phone system ?: Angle l variation between the main axis
of the microphone and the sound source ?: To angular frequency: He long fixed two
microphones 1) of units l and 2] ? ?: bottom of own tree pair 2 However, the microphone units
l and 2 have same shoulders if same, ?, ? directionality (4- direction 1 life) Assume that
Further, when the equation (1) is expanded, it becomes ?, and further, in the equation (2),
considering only the front-phase direction with respect to the sound source, ? = 0 ░, so the fish
?-1 is obtained. The following equation (2) is obtained. . -6, J ?] U stone ear f]] (2) Q: sound
speed, f: 1 wave number, D = distance between microphone units 1 and 2], KD changes with
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frequency. By the way, considering KD = 2?n (n is an integer), jd, cm (KD) = 1. Since sm (D) = 0,
E = O and a dip occurs in the frequency characteristic. Next, the fact that the output E has a gain
of 6 dB per octave down to the low band can be better understood than the following. That is, if
the above equation (2) is further rhombic, EndPage: 2E = c, JT-JT alternates with U,... (21 and KD
is in the range of O ? KD ? 2? ░, the frequency of the output E It can be understood that the
characteristic is a characteristic of 16 dB / octave. Of course, the dip of the same wave number
characteristic can also be understood from the equation (2). FIG. 4 shows the same wave a
characteristic of the output E calculated by the above-mentioned intermediate to equation (2),
that is, the same wave number characteristic of the output of the subtraction circuit 3 shown in
FIG. Also, FIG. 5 shows a typical four-way characteristic at a certain frequency in this
conventional secondary sound IE1 degree single-directional microphone system.
Thus, the output of the microphone units 1 and 2 is passed to the subtraction circuit 3 in order
to realize the secondary tone w e single directivity in the conventional second tone wring: single
directional microphone 7 stem Since the output goes down by 6 dB per octave toward the low
band, the gain is increased by 6 dB per octave toward the low band as shown in FIG. 1 to correct
this. You need an equalizer 4 to As a result, for example, considering the reproduction band from
0 to 8 KHz, the correction amount of Icora iser 4 near 100H2 needs amplification of 20 dB or
more, and as a result, deterioration of S / N as a microphone system or , L noise and other bad
proofs occur. The present invention is a means for realizing the second-order sound field
gradient single directivity, and as in the conventional example, the secondary sound pressure
gradient variation single battery which is less susceptible to the deterioration of S / IJ and the
wind noise as much as possible. A directional microphone system is provided, and a block
diagram of a secondary sound pressure gradient mono-directional microphone / stem of the
present invention is shown in FIG. The point that is the same as the example is that 71 Ipass
filter-5t-inserted in the output of the microphone unit l) и и и и и и и the output of the microphone
unit 2 of the output toy output through the I pass filter 5 the fort circuit 3 To perform
subtraction processing. In this case, the output of the subtraction circuit 3 will be described later.
By such a phenomenon, the same wave number characteristic as shown in FIG. 7 is obtained.
Therefore, in order to flatten the output through the subtraction circuit 3 and the linearity, the
output of this Iyi calculating circuit 3 is shown in FIG. There is an equalizer-4 'nis if it has. The
bypass filter 5 may be modified to the output circuit of the microphone 7 summ 1 and inserted
into the output circuit of the microphone unit 2.
2nd note, button single-directional microphone system 2 claim 1 [one-directional microphone
Uninoto? In the means for achieving secondary sound pressure gradient single-directivity by mcharging 21 microphone units among the seven microphone units, the above 2 (solid
microphone units in the sound source direction) The microphone unit oil is directed at a
predetermined distance, spaced one to another, and either one of the output circuits of each of
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the two microphone units is inserted into the Nei-Pass filter, and the bypass filter is inserted. The
second sound pressure gradient monotonous directional microphone 7 stem characterized in that
the output passed through and the output of the other microphone unit are divided by 1 so as to
subtract.
Next, the present invention will be described in detail. First, at low frequencies, the output of the
microphone unit 1 has almost no gain after passing through the filter 5, so the same wave
number characteristics and directivity characteristics of this microphone system substantially
depend on the characteristics of the microphone unit 2. Also, the output of the microphone unit
1 has almost no gain loss. ('; 800H7 to 8KH2 in 47) can be considered the same as the
microphone system shown in FIG. 1 and the gain drops by 6 dB for one octave toward the low
frequency band of the solid wave number characteristic strain. It becomes the characteristic
which has a slope. Furthermore, a dip occurs at a frequency where the wavelength of the sound
is equal to the: i eta separation of the microphone units 1 and 2. However, the frequency
characteristic through the subtraction circuit 3 becomes the same wave number characteristic as
shown in 2?7. Then, in order to correct the output characteristic passed through the subtraction
circuit 3 flat, the output of the subtraction circuit 3 may be passed through an equalizer 4 having
the same wave number characteristic as shown in FIG. As a result, the amount of correction by
the equalizer 4 'in the mid band requiring correction is 10 dB'4? The amount of correction may
be significantly smaller than the amount of correction by 20 dB of the equalizer 4 according to
the prior art. Since the S / N of the microphone 7 sumem depends on the correction amount of
the equalizer, the microphone system of the present invention and that of the conventional one
are advantageous because the present invention has a smaller amount of correction of the
equalizer. It becomes. EndPage: 3 Next, although it is an effect on K noise, it is well known that
the noise spectrum of J wind noise is focused on the low region. Therefore, the equalizer of the
microphone 7 stem of the prior art has the disadvantage that it is weak against noise in the low
range because it has to perform complementary 1-E on the low side to the dog and the low side
as shown in 1 above. However, in the microphone system of the present invention, as in the
?harmonic number characteristic of the equalizer 4 ? shown in FIG. 8, it is zero before the
correction in the low range, and the wind noise level is almost noon-pointing. Performance
equivalent to that of the Furthermore, in the microphone / stem of the present invention, in the
band below the cutoff wave number of the bypass filter 5, the directivity characteristic of this
microphone 7 nutem (the same as the unidirectional characteristic, but one use band is set If the
cutoff frequency of the Ipass filter 5 described above is a frequency sufficiently lower than the
grouping band, the directivity characteristic in the used band is almost the second sound
pressure robustness single-directivity It will show directivity characteristics.
Next, when the microphone 7 stem ta (+ K ? ?) of the present invention is subjected to analysis,
the following d ? ? is obtained. The gain of the filter, O + R is the capacitor and resistor that
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make up the I Haybass filter, B = 1, ? (? = m-'(7 T) = и the phase angle of the Haypass filter,
furthermore, ?-"DQ) If the equation (3) is arranged with S?, the absolute value of the
microphone output can be obtained from Salani, equation (4), that is, (5J is a frequency 1?l 4
before correction by the equalizer of the microbon system of the present invention It is an
expression that lengthens the sex and directional characteristics. The frequency characteristic of
the bypass filter 5 in the block diagram shown in FIG. 6 of the present invention is a cell having a
slope of 6 dB or 1 dB of 12 dB as described above. Anything else is fine. Because the frequency
and attack characteristics of the output signal after passing the output of the individual-of this: A
combination, microphone output terminal t2 to the subtraction circuit 3 differ depending on the
cut third q wave number of the bypass filter and the filter characteristic The output
characteristics of the frontal axis of the microphone must be adjusted to be flat according to the
respective characteristics. Moreover, the equalizer 4 shown in FIG. 46 of the present invention
does not have to be designed so as to have the reverse characteristic of the time as shown in FIG.
7 after all through the subtraction circuit 3 and it is necessary to In order to limit the band, the
low band may be positively set to 4 rFr.
2nd note, button single-directional microphone system 2 claim 1 [one-directional microphone
Uninoto? In the means for achieving secondary sound pressure gradient single-directivity by mcharging 21 microphone units among the seven microphone units, the above 2 (solid
microphone units in the sound source direction) The microphone unit oil is directed at a
predetermined distance, spaced one to another, and either one of the output circuits of each of
the two microphone units is inserted into the Nei-Pass filter, and the bypass filter is inserted. The
second sound pressure gradient monotonous directional microphone 7 stem characterized in that
the output passed through and the output of the other microphone unit are divided by 1 so as to
subtract.
Furthermore, although the detailed description of the present invention mainly describes the
improvement measures of the second-order BI ? ? E, Je uni-directional microphone 7 stem,
these techniques can be used to quickly read from omnidirectional to superdirective, for example.
Needless to say, it can be applied to the 'T's X directional microphone system.
4. Brief description of the drawings и Fig. 1 is a block diagram of a conventional 2 ░ second
order sound field gradient mono-directional microphone / stem, a diagram showing the
frequency characteristics of a JE 2 F 21 uni-directional microphone unit, Fig. 3 FIG. 4 also shows
directivity characteristics, FIG. 4 shows wave number characteristics after passing through the
subtraction circuit of FIG. 1, FIG. 5 shows a conventional example and a general secondary pitch
slope including the present invention. -A diagram showing the directional characteristics of the
directional microphone system, FIG. 6 is a block diagram of the secondary sound pressure
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gradient mono-directional microphone system of the present invention, and FIG. 7 is a view after
the subtraction circuit of FIG. FIG. 6 is a diagram showing the frequency characteristics of the
FIG. 6, EndPage: 48 is a diagram showing the frequency characteristics of the equalizer of FIG.
1.2 иии Unidirectional microphone unit, 3 и и и 11-circuit, 4 и и и Equalizer, 5 и и и и и и и и и и и и и и и и и и и
sound source D и и и microphone unit Arrangement interval, x ... microphone cohon main dance.
Patent issued / convicted person Victor Victor Company of Japan Company Representative
Atsushi Ohgika Dojo Shigemi Doumi Araki End Page: 5s 5 Figure 6 Figure 7 Figure 118 Source:
tL (Hz) EndPage: ?
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