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JP2005184315

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DESCRIPTION JP2005184315
PROBLEM TO BE SOLVED: To effectively solve the problem of the sound quality change caused
by the attachment of a wind screen as the microphone device itself. SOLUTION: Equalizers 13-1
and 13-2 are set in which equalizing characteristics capable of correcting a change in sound
quality when the windscreen 5 is attached are provided, and two states of attachment / nonattachment of the windscreen 5 are provided. Detection is performed using phototransistors 4-1
and 4-2. Then, based on the detection result, the equalizers 13-1 and 13-2 are switched to be
effective when the wind screen 5 is attached and to be ineffective when the wind screen 5 is not
attached. [Selected figure] Figure 4
Microphone device
[0001]
The present invention relates to a microphone device that picks up voice and outputs it as a voice
signal, and more particularly to a microphone device to which a windscreen can be attached.
[0002]
When using a microphone device that is a device for picking up voice and obtaining a voice
signal, for example, a phenomenon occurs in which the sound of the wind is picked up as noise
when the wind around it is strong. Is a well-known thing.
Therefore, it has been widely practiced to cover the sound pickup portion of the microphone with
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a windscreen. The windscreen is generally made of, for example, a foamed resin and is mounted
so as to wrap around the main body portion where the sound collecting portion is located. When
the windscreen is mounted in this manner, the windscreen is blocked by the windscreen, and it
does not blow directly into the sound collection unit, so that wind noise is reduced and
prevented.
[0003]
Japanese Patent Laid-Open No. 11-275672
[0004]
By the way, when the windscreen is mounted, the sound absorption action of the windscreen
causes a disadvantage that the frequency characteristic of the collected sound changes due to the
characteristic that the high frequency range particularly attenuates.
However, under the present circumstances, no effective measures have been taken to solve the
problem of the sound quality change caused by the attachment of such a windscreen as the
microphone device itself.
[0005]
In view of the above problems, the present invention takes into account the above-described
problems, and a sound pickup unit that picks up sound and an equalizer that performs
equalization processing on a sound signal obtained by picking up sound by the sound pickup unit
with predetermined equalization characteristics Means, detection means for detecting whether or
not the windscreen is attached, and validity / invalidity setting means for setting validity /
invalidity of equalization processing by the equalizer means according to the detection result of
the detection means. did.
[0006]
According to the above configuration, the microphone device of the present embodiment is
configured to perform equalization processing by the equalizer means on the audio signal
obtained by collecting the sound, but this is a method of setting the equalization characteristic of
the equalizer means This means that it is possible to compensate for the change in sound quality
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of the collected sound due to the attachment of the windscreen.
Furthermore, in the present invention, it is detected whether or not the windscreen is attached,
and according to the detection result, the equalizer means is used when the windscreen is
attached and not attached. Can be switched on / off.
[0007]
From this, according to the present invention, when the windscreen is mounted, an audio signal
in which the sound quality change of the collected sound is corrected is outputted, and when the
windscreen is not mounted, the above-mentioned sound quality change is It is possible to
automatically switch to output an audio signal for which the correction has been canceled. That
is, the problem of the sound quality change caused by the attachment of the wind screen is
effectively solved as the microphone device itself.
[0008]
FIG.1, FIG.2, FIG.3 has shown typically the external appearance of the microphone apparatus 1 as
embodiment of this invention. Also, in these figures, the windscreen 5 mounted on the
microphone device 1 is also shown. FIG. 1 shows a side view of the microphone device 1 with the
windscreen 5 removed, and FIG. 2 shows a side view of the microphone device 1 with the
windscreen 5 mounted in a defined position. Show. In FIGS. 1 and 2, the windscreen 5 is shown
in cross section. Moreover, FIG. 3 shows a plan view of the microphone device 1 on the upper
side in the drawing, and shows a front view on the lower side. Moreover, in this FIG. 3, the wind
screen 5 is shown by the broken line.
[0009]
As shown in FIGS. 1 to 3, the microphone device 1 according to the present embodiment is
configured such that the microphone grille 3 which is cylindrical in this case is attached to and
integrated with the base portion 2. Be done. The shape of the microphone grille 3 should not be
particularly limited to such a cylindrical shape. Attached to the microphone grille 3 side is, for
example, a diaphragm that captures air vibration corresponding to voice, and a sound collection
unit that includes a circuit portion for converting the vibration captured by this diaphragm to an
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electrical signal. It is done. Further, in the inside of the base unit 2 are mainly stored components
constituting a signal processing circuit system that processes the electric signal output from the
sound collection unit unit as an audio signal. Of course, such circuit components may also be
provided inside the microphone grille 3 side. Also, for example, when the microphone device 1 is
externally attached to the recording device, a cable, a plug or the like for connecting to the
microphone input terminal on the recording device side is provided on the base portion 2 side.
To be
[0010]
In this case, two phototransistors of the first phototransistor 4-1 and the second phototransistor
4-2 are attached to the microphone grille 3. The first phototransistor 4-1 and the second
phototransistor 4-2 are provided such that their light receiving portions are exposed from the
microphone grille 3. That is, it is provided so that external light around the microphone device 1
can be received. The arrangement positions of the first phototransistor 4-1 and the second
phototransistor 4-2 will be described later.
[0011]
The wind screen (windshield) 5 in this case is formed in a cylindrical shape as illustrated by, for
example, a foamed resin. Then, the windscreen 5 is mounted such that the microphone grille 3 is
inserted from the front end side with respect to the inside of the tube of the windscreen 5.
[0012]
When the wind screen 5 is mounted as shown in FIG. 2, the wind screen 5 covers the sound
collection unit portion provided on the microphone grille 3. As a result, the surrounding wind is
blocked by the wind screen 5 and is not blown directly into the sound collection unit, and the
noise of the wind collected by the sound collection unit is reduced. .
[0013]
Subsequently, arrangement positions of the first phototransistor 4-1 and the second
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phototransistor 4-2 in the microphone grille 3 will be described. The first phototransistor 4-1
and the second phototransistor 4-2 are in a state (mounted state) in which the windscreen 5 is
mounted in a prescribed position range, or not (not mounted) Provided to detect whether it is in
the state).
[0014]
First, as can be seen by comparing FIG. 1 with FIG. 2, the first phototransistor 4-1 is always a
windscreen, regardless of whether the windscreen 5 is mounted in the specified position range or
not. No. 5 is not covered and is arranged at a position exposed to the outside. On the other hand,
the second phototransistor 4-2 is exposed to the outside when the wind screen 5 is not mounted
in the specified position range, but is covered by the wind screen 5 in the mounted position
range. It is placed in the position to be controlled.
[0015]
With such a positional relationship, when the windscreen 5 is in the non-mounted state, the
amount of external light received by the first phototransistor 4-1 and the second phototransistor
4-2 is substantially the same. Therefore, even if the levels based on the outputs of the first
phototransistor 4-1 and the second phototransistor 4-2 are compared, they are almost the same
level. On the other hand, when the windscreen 5 is in the mounted state, only the second
phototransistor 4-2 is covered by the windscreen 5. Since the wind screen 5 has a corresponding
light shielding property, the amount of light received by the second phototransistor 4-2
decreases with respect to the amount of light received by the first phototransistor 4-1. For this
reason, the level difference occurs such that the level based on the output of the second
phototransistor 4-2 is smaller than the level based on the output of the first photo transistor 4-1.
In the present embodiment, the circuit configuration described later detects whether the
windscreen 5 is in the mounted state or in the non-mounted state according to the change in the
level difference thus generated.
[0016]
In this case, as shown in FIG. 3, for example, assuming that a straight line passing through the
vertical surface along the front-rear direction of the microphone grille 3 is L, the first
phototransistor 4-1 and the second phototransistor 4- 2 is disposed on the upper side of the
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microphone grille 3 so as to be located on the straight line L. This is intended to allow, for
example, light incident from a specific direction to be incident with substantially the same light
amount by the first phototransistor 4-1 and the second phototransistor 4-2. It is a thing. For
example, assuming that the first phototransistor 4-1 is disposed with respect to the position
immediately above as shown in the front view of FIG. 3 as the easiest example to understand, the
second phototransistor 4-2 is the front of FIG. Suppose that it arrange | positions in the position
which becomes just under in the figure. Alternatively, the positions may be interchanged between
the first phototransistor 4-1 and the second phototransistor 4-2. That is, the phototransistors 4-1
and 4-2 are arranged according to the positional relationship of being up and down with each
other. In this case, for example, assuming that the main incident direction of the external light is
from the upper side, the lower side relative to the phototransistor located on the upper side, even
if the windscreen 5 is not disposed. The amount of light received by the phototransistor located
is smaller, and a difference occurs in the level obtained based on the outputs of the two
phototransistors. As described above, the detection of whether the windscreen 5 is in the
mounted state or not is generated when the windscreen 5 is mounted, and the output level
difference of the phototransistors 4-1 and 4-2. On the contrary, when the windscreen 5 is not
attached, the difference in output level between the phototransistors 4-1 and 4-2, that is, the
difference in the amount of received light is as small as possible. preferable. For this reason, in
the present embodiment, as described above, the arrangement of the phototransistors 4-1 and 42 located on the straight line L in FIG. 3 is employed.
[0017]
As for the arrangement positions of the phototransistors 4-1 and 4-2, if the windscreen 5 is not
mounted, the balance of the light reception amounts of the phototransistors 4-1 and 4-2 will be
equal. For example, it should not be particularly limited. However, as in the present embodiment,
the light receiving portion is directed upward as the arrangement position of the phototransistors
4-1 and 4-2 in the case of considering normal use only with sunlight However, even in
consideration of artificial light such as illumination, it is considered that the main incident
direction of the external light is larger in the situation from the upper side. In the present
invention, the external shape of the microphone device is not limited to those shown in FIGS. 1 to
3 above, for example, and may be arbitrarily changed, and such a microphone may be used.
Depending on the external shape of the device, the arrangement positions of the phototransistors
4-1 and 4-2 should be changed after being considered so as to satisfy the requirements as
described above.
[0018]
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Subsequently, the internal circuit configuration of the microphone device 1 will be described with
reference to FIG. Here, the description will be made on the premise that the microphone device 1
is a condenser type and that it is stereo compatible with Lch (left channel) and Rch (right
channel). The signal system corresponding to Lch will be described. The sound collection unit
unit 10-1 is attached to, for example, the microphone grille 3 at a position where the sound of
Lch can be collected. Further, as described above, when the windscreen 5 is mounted, it is
mounted at a position covered by the windscreen 5 as described above. The sound collection unit
portion 10-1 in this case is configured to include a diaphragm, a capacitor, an electrode, and the
like as a well-known structure as a structure corresponding to a capacitor type. Then, an
electrical signal (audio signal) obtained by collecting an external sound in the sound collection
unit unit 10-1 is input to the preamplifier 11-1.
[0019]
In the preamplifier 11-1, the audio signal output from the sound collection unit 10-1 is input,
amplified (impedance conversion), and output to an HPF (High Pass Filter) 12-1. In this case, the
HPF 12-1 removes noise-like band components in the audio signal that are generated by picking
up external vibrations transmitted to the microphone device 1, wind, human breath, and the like
by the sound collection unit 10-1. Provided to Therefore, the setting is performed in
consideration of the above-described purpose also as the cutoff frequency of the HPF 12-1.
[0020]
The audio signal that has passed through the HPF 12-1 is output to the equalizer 13-1, and is
branched and output to the terminal t2 of the switch 14-1. Here, as described with reference to
FIGS. 1 to 3, the microphone device 1 according to the present embodiment can reduce noise
noise due to wind or the like included in the collected voice by mounting the wind screen 5. ing.
However, when the windscreen is attached, the sound quality of the collected sound changes due
to the sound absorption effect of the windscreen and the like. For example, if the frequency
characteristics of the collected voice (audio signal) in a state where the wind screen 5 is not
attached is schematically shown in FIG. 5A, the wind screen 5 is attached. The frequency
characteristic of the collected voice when it is present is changed as shown in FIG. 5 (b). Although
it can be said as a general thing, as can be understood by comparing these FIGS. 5 (a) and 5 (b),
particularly when the windscreen 5 is attached, there is a tendency that the amplitude level of
high frequency components in the audio signal is reduced. Appear prominently. And, usually, the
change of the sound quality caused by wearing such a windscreen 5 is treated as the
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deterioration of the sound quality.
[0021]
Therefore, in the present embodiment, the change in the sound quality caused by mounting such
a windscreen 5 is corrected by audio signal processing as equalizing. The equalizer 13-1 is
provided to perform such equalization processing on the Lch audio signal. For example, as an
audio signal output obtained by equalizing an audio signal (output of the HPF 12-1) obtained
based on the collected voice when the wind screen 5 is mounted as shown in FIG. It has the
frequency characteristics shown in FIG. The broken line shown in this figure shows the same
characteristics as FIG. 5 (b). As can be seen from FIG. 5 (c), by passing through the equalizer 131, the frequency characteristic of the audio signal is amplified so that the high frequency part can
be lifted, and as shown in FIG. 5 (b) In comparison, the frequency characteristics of the audio
signal shown in FIG. 5A are closer. That is, correction of the high frequency band of the sound
signal attenuated due to the wearing of the wind screen 5 is performed.
[0022]
It should be noted that, in actuality, the equalization characteristics of the equalizer 13-1 may be
set as follows. First, a test is performed to compare the actual frequency band characteristics of
an audio signal obtained when the windscreen 5 is attached and an audio signal obtained when
not attached. Then, an equalizing characteristic is obtained such that the frequency band
characteristic when the windscreen 5 is attached is substantially equal to the frequency band
characteristic when the windscreen 5 is not attached. Also, in this case, the reproduced speech
may be reflected on the test result of the actual listening. Then, the equalizing characteristic thus
obtained is set in the equalizer 13-1.
[0023]
The switch 14-1 is a switch which is switched such that the terminals t1 and t2 are alternatively
connected to the terminal t3, and may be, for example, actually an electronic switch or the like.
Further, in this case, terminal switching in the switch 14-1 is performed by a switch control
signal Scnt of H (High) / L (Low) output from the comparator 18 described later.
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[0024]
The output of the equalizer 13-1 is connected to the terminal t1 of the switch 14-1, and the
output of the HPF 12-1 is connected to the terminal t2. The terminal t3 is connected to the input
terminal of the amplifier 15-1. The amplifier 15-1 amplifies the audio signal input from the
terminal t3 and outputs it as an Lch audio signal. The audio signal output of the Lch is input to a
recording device connected via a cable or plug of the microphone device 1 not shown here, for
example.
[0025]
According to such a configuration of the Lch audio signal system, in a state where the terminal t1
and the terminal t3 are connected in the switch 14-1, the audio signal subjected to the
equalization processing by the equalizer 13-1 is transmitted via the amplifier 15-1. It will be
output. On the other hand, when the terminal t2 and the terminal t3 are connected in the switch
14-1, the audio signal output from the HPF 12-1 passing through the equalizer 13-1 is output via
the amplifier 15-1. It will be That is, when the terminal switching is performed in the switch 141, the setting switching of the valid / invalid of the equalizer 13-1 in the Lch audio signal system
is also performed.
[0026]
The sound signal system of Rch includes the sound collection unit 10-2, the preamplifier 11-2,
the HPF 12-2, the equalizer 13-2, the switch 14-2, and the amplifier 15-2 and the sound signal
system of the Lch. Similar to the unit portion 10-1, the preamplifier 11-1, the HPF 12-1, the
equalizer 13-1, the switch 14-1, and the amplifier 15-1, they are connected and formed. Further,
the switch 14-2 for the Rch audio signal system is also controlled by the H (High) / L (Low)
switch control signal Scnt output from the comparator 18 in the same manner as the Lch audio
signal system switch 14-1. A switch is made.
[0027]
With this configuration also for the Rch audio signal system, even for an audio signal obtained as
a result of sound collection by the sound collection unit unit 10-2, an equalizer can be used
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according to terminal switching in the switch 14-2. The setting switching of valid / invalid of 132 will be performed. Further, the switching operation of the switch 14-2 is performed in
synchronization with the switch 14-1 by a switching pattern similar to that of the Lch switch 141.
[0028]
Further, in this figure, the first phototransistor 4-1 and the second phototransistor 4-2 are each
shown as a block. As is well known, the phototransistor is one of the light receiving elements, and
an amplifying operation is performed in accordance with the amount of light received by the
light receiving unit. The same standard product is used for the first phototransistor 4-1 and the
second phototransistor 4-2. Thereby, in the same light receiving environment, amplified outputs
which are at the same level can be obtained.
[0029]
In this case, the amplified output of the first phototransistor 4-1 is input to the attenuator 16.
The attenuator 16 attenuates the amplitude of the output of the input first phototransistor 4-1
with a predetermined attenuation factor, and outputs the attenuated signal to the comparator 18.
Further, the amplified output of the second phototransistor 4-2 is input to the comparator 18
after being waveform-shaped by the integration circuit (LPF) in which a predetermined time
constant is set.
[0030]
In the comparator 18, the amplification output of the first phototransistor 4-1 passed through
the attenuator 16 is input as a reference level, and the amplification output of the second
phototransistor 4-2 output from the integration circuit 17 is input as a comparison level. Level
comparison is performed for both, and one of H / L detection signals is output as the comparison
result. This detection signal becomes the switch control signal Scnt for the switches 14-1 and 142.
[0031]
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Here, the attenuator 16 and the integration circuit 17 are provided for the purpose of obtaining a
more accurate result as a comparison result (detection result) in the comparator 18. As described
above, since the first phototransistor 4-1 and the second phototransistor 4-2 select the same
standard product, substantially the same amplified output can be obtained, for example, when
the windscreen 5 is not attached. It is made to be obtained. It is necessary that the amplification
output of the phototransistors 4-1 and 4-2 themselves be uniform under the same light receiving
environment in order to improve the reliability of the detection result. However, as an actual
operation of the comparator 18, first, when the windscreen 5 is not attached, a stable detection
signal is obtained by having a necessary and sufficient level difference between the reference
level and the comparison level. To be able to get Therefore, in the present embodiment, the level
difference is obtained by attenuating the amplified output of the first phototransistor 4-1 by the
attenuator 16. Accordingly, the actual attenuation factor of the attenuator 16 should be set in
consideration of ensuring that the above-mentioned level difference is obtained. In addition, even
if the same standard product is selected for the first phototransistor 4-1 and the second
phototransistor 4-2, in fact, the amplification output for the same received light amount is also
caused by the variation of the amplification factor for each component element. There is a
corresponding variation. The setting of the attenuation factor should be performed in
consideration of the variation of the element as such a phototransistor.
[0032]
In addition, for example, even if the windscreen 5 is not mounted, some kind of object is held on
the phototransistor 4-2 side, for example, and a shadow can be generated in a relatively short
time. Is of course considered. However, in fact, it is not preferable to output a detection signal
corresponding to the state in which the windscreen 5 is mounted in the comparator 18 in
response to such a change. Therefore, the amplification output of the phototransistor 4-2 is
smoothed by the integration circuit 17 so that it does not react to the above-mentioned
amplification output for a short time.
[0033]
The timing chart of FIG. 6 shows the comparison operation in the comparator 18. 6 (a) shows the
amplified output (reference input) SD1 of the first phototransistor 4-1 input to the comparator
18 via the attenuator 16, and FIG. 6 (b) shows the signal via the integration circuit 17. The
amplified output (comparison input) SD2 of the second phototransistor 4-2 is input to the
comparator 18. FIG. 6C shows a switch control signal Scnt which is a detection output of the
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comparator 18.
[0034]
First, in FIG. 6, the windscreen 5 is in the non-mounted state before time t1. At this time, first, the
amplified output of the first phototransistor 4-1 obtained according to the state of the ambient
light is attenuated by the attenuator 16, but here, as shown in FIG. As shown in 6 (a), it is
assumed that the level A is almost constant.
[0035]
On the other hand, since the amplified output of the second phototransistor 4-2 obtained
according to the ambient light at this time is integrated as the comparison input SD2, the level B
according to the light amount of the ambient light is obtained. A state where it becomes almost
constant is obtained. It can be said that the level B of the comparison input SD2 at this time is
higher than the level A by the amount by which the attenuation by the attenuator 16 is not
performed.
[0036]
The comparator 18 in this case is configured to output an H level when SD1> SD2 and an L level
when SD1 <SD2 as a level relationship between the reference input SD1 and the comparison
input SD2. For this reason, in the state where the windscreen 5 before the time t1 is not attached,
SD1 (level A) <SD2 (level B), so the comparator 18 sets L level as the switch control signal Scnt. It
is outputting.
[0037]
In this case, when the switch control signal Scnt is at the L level, the switches 14-1 and 14-2
connect the terminal t2 to the terminal t3. Therefore, in the Lch and Rch audio signal systems,
the equalizers 13-1 and 13-2 are passed, and the outputs of the HPFs 12-1 and 12-2 are directly
input to the amplifiers 15-1 and 15-2. . That is, at this time, the equalization processing of the
equalizers 13-1 and 13-2 is invalid in each of the Lch and Rch audio signal systems.
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[0038]
Then, it is assumed that the windscreen 5 is attached at time t1. As a result, the amount of light
received on the second phototransistor 4-2 side is significantly reduced, and the amplification
output thereof is also significantly reduced. It should be noted for confirmation that the amount
of light received at the second phototransistor 4-2 side does not change at this time, so the level
A is maintained without changing the amplification output.
[0039]
Here, in the present embodiment, since the amplification output of the second phototransistor 42 is made to pass through the integration circuit 17, the comparison input SD2 is output from
the integration circuit 17 from time t1 onward when the windscreen 5 is attached. It has time
progress according to a time constant, and it is made to fall to the level C corresponding to the
amplification output of the original 2nd phototransistor 4-2. Then, in the process of decreasing
to the level C, the level of the comparison input SD2 becomes smaller than the level A of the
reference input SD1 of the comparator 18, for example, as shown as time t2 in FIG. As a result,
the magnitude relationship between the levels of the reference input SD1 and the comparison
input SD2 changes to SD1 (level A)> SD2 (level B), and the switch control signal Scnt output from
the comparator 18 changes from L level to H level. It will change to the level.
[0040]
In this case, when the switch control signal Scnt becomes H level as described above, the
switches 14-1 and 14-2 connect the terminal t3 and the terminal t1. As a result, in the Lch and
Rch audio signal systems, the audio signals output from the HPFs 12-1 and 12-2 are output to
the amplifiers 15-1 and 15-2 via the equalizers 13-1 and 13-2, respectively. It is input. That is,
the equalization processing of the equalizers 13-1 and 13-2 is switched to be effective in each of
the Lch and Rch audio signal systems. By the way, since the comparison input SD2 becomes
almost constant at the level C at a certain point in time unless the windscreen 5 is removed after
the point t2, the comparator 18 continues to output the H level, accordingly Also, the state in
which the equalization processing of the equalizers 13-1 and 13-2 is effective is maintained.
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[0041]
As understood from the above description, in the microphone device 1 according to the present
embodiment, the windscreen 5 is attached to the sound signal obtained by collecting the sound
by providing the equalizers 13-1 and 13-2. It is possible to correct the change in sound quality
due to being Furthermore, in the present embodiment, it is possible to detect whether the
windscreen 5 is in the mounted state or in the non-mounted state, and according to the detection
result, equalization of the equalizers 13-1 and 13-2 is performed. The processing is enabled
when the wind screen 5 is in the mounted state, and disabled when the wind screen 5 is in the
non-mounted state. Thereby, the correction of the frequency band characteristic of the audio
signal by the equalizing process is performed only when the wind screen 5 is in the mounted
state, and the equalizing process is performed when the wind screen 5 is not mounted. By being
broken, the sound quality is not unnatural. And, in the present embodiment, switching of the
effectiveness / ineffectiveness of such equalizing processing is automatically performed in
accordance with the mounting / non-mounting state of the windscreen 5. Therefore, as the user,
it is not necessary to consciously confirm whether the wind screen 5 is in the mounting / nonmounting state, for example, and to perform the on / off operation of the equalizing process, for
example. Is given.
[0042]
According to the above description, the integration circuit 17 is provided so that the timing at
which the windscreen 5 is actually mounted or the timing at which the windscreen 5 is removed
and is not mounted can be obtained. The timing at which the enable / disable of the equalizing
process is switched is delayed. That is, in FIG. 6, a time lag indicated by a period of time t1 to
time t2 occurs. However, taking into consideration that the malfunction as described above does
not occur as the time constant of the integration circuit 17, if the time lag is set so as to fall
within a certain short time, Since the period in which the wrinkles occur between the mounting
state of the windscreen 5 and the effective / ineffective setting state of the equalizing process can
be made correspondingly short, it is considered that there is no particular problem in practical
use.
[0043]
Further, according to the present invention, the integration circuit 17 is not particularly essential.
For example, even if the integration circuit 17 is not provided, the integration circuit 17 may be
08-05-2019
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omitted as long as a practically acceptable detection result can be obtained. It can also be done.
In this case, it is possible to reduce the circuit scale and cost accordingly. Further, the attenuator
16 for obtaining the level difference between the reference input SD1 and the comparison input
SD2 is also not particularly essential as the present invention. For example, it is conceivable to
relatively obtain the above-mentioned level difference by, for example, increasing the gain of the
amplified output of the second phototransistor 4-2, and in this case, the attenuator 16 is
unnecessary. Furthermore, in the circuit configuration shown in FIG. 4, in the audio signal system
for the collected sound signals output from the sound collection units 10-1 and 10-2, the
equalizers 13-1 and 13-2 and the switches 14-1 and 14 are provided. Parts other than -2 may be
omitted as required in the present invention. In addition, in the case of the circuit configuration
of FIG. 4, a power supply is actually required. For example, if the microphone device 1 can
accommodate a battery and the battery shown in FIG. 4 is driven by the battery Good. In
addition, it is also considered to be a so-called phantom power supply, and by connecting a
microphone device to a microphone input on the recording device side, it is possible to operate
with a power supply supplied from the recording device side. Furthermore, when (HPF12-1, 122) is provided, for example, the HPF 12-1, 12-2 may be configured to be able to perform an
operation of turning on (effective) / off (ineffective). Conceivable. For example, particularly when
the user is anxious about the sound of a person's breath or wind, the user turns off the operation
of turning on the HPF to suppress such offensive sound components. Also, turn off the HPF if you
do not mind such sounds. When the HPF is turned off, it is expected that the sound quality to be
collected will be improved. Also, although the audio signal system shown in FIG. 4 is exemplified
in the case of stereo, it may be monaural. Moreover, in the above description, although the
microphone apparatus 1 of this Embodiment was demonstrated as being a capacitor type, it is
applicable also to a dynamic type etc. FIG.
[0044]
Furthermore, as the embodiment of the present invention, the configuration for detecting the
attachment / non-attachment of the windscreen 5 is the first phototransistor 4-1, the second
photo, as shown in FIGS. It should not be limited to the configuration including the transistor 4-2.
Therefore, as a modified example of the embodiment, another configuration example for
detecting attachment / non-attachment of the windscreen 5 will be described with reference to
FIGS. 7 and 8. FIG. FIG. 7 shows a state in which the windscreen 5 is removed as a side view of
the microphone device 1 of the modified example. FIG. 8 is a side view of the microphone device
1 of the modification, showing a state in which the windscreen 5 is mounted in a prescribed
position. Also in this case, the windscreen 5 is shown in cross section in FIGS. 7 and 8.
[0045]
08-05-2019
15
In this case, as shown in FIGS. 7 and 8, a magnetic sensor 41 is attached to the microphone grille
3 as a detection element in place of the phototransistor. Further, in this case, a magnetic material
sheet 40 formed of a predetermined magnetic material is attached to the wind screen 5 side
corresponding to the magnetic sensor 41. In this case, as shown in FIG. 8, the magnetic sensor
41 is placed on the microphone grille 3 in such a position that it will be covered by the wind
screen 5 in a state where the wind screen 5 is mounted in a prescribed position range. It is
provided for. Further, the magnetic material sheet 40 is in a position substantially facing the
magnetic sensor 41 when the wind screen 5 is mounted in a prescribed position range in the
cylinder in which the microphone grille 3 of the wind screen 5 is inserted. To be attached.
Further, in this case, in the state where the wind screen 5 is mounted, the rotational position of
the wind screen 5 when viewed from the front is arbitrary. Correspondingly to this, the magnetic
material sheet 40 is attached in a substantially complete ring shape in the cylinder of the wind
screen 5 so as to cover the entire circumference of the circumferential shape. Thus, as long as
the windscreen 5 is inserted in the specified position range with respect to the microphone grille
3, the magnetic material sheet always faces the magnetic sensor 41 regardless of the rotational
position of the windscreen 5. Forty parts are to be obtained.
[0046]
In this modification, when the wind screen 5 is in the non-mounted state, the magnetic sensor 41
does not particularly detect magnetism. On the other hand, when the wind screen 5 is attached,
the magnetic sensor 41 and the magnetic sheet 40 face each other, so that the magnetic body
exists within a predetermined distance, and the magnetic sensor 41 Will detect magnetism. Then,
if the terminals of the switches 14-1 and 14-2 are switched in the same manner as in the case of
FIG. 4 according to the result of such magnetic detection, the windscreen 5 can be attached or
not attached. Accordingly, it is possible to switch between enabling and disabling equalizing
processing. In order to confirm, in this case, the attenuator 16, the integrating circuit 17, the
comparator 18, etc. which the detection circuit system in FIG. 4 has are not necessary. The first
phototransistor 4-1 and the second phototransistor 4-2 are preferably arranged above the
microphone grille 3 so that they can receive light efficiently, but in the case of this modification,
Since it is based on magnetic detection, it is not necessary to consider the light receiving
efficiency. Therefore, the mounting position of the magnetic sensor 41 in the side direction of the
microphone grille 3 is not limited to the upper side, but may be any mounting position such as
right side, left side, or lower side.
[0047]
08-05-2019
16
Also, in practice, the microphone device 1 of the present embodiment can be configured as an
independent device that is separate from the main body of the device capable of recording.
Moreover, it can also be set as the structure integrated with the apparatus which can be
recorded. As in the former case, a usage example in the case of being configured separately from
a recordable device is shown in FIG. In FIG. 9, the microphone device 1 of the present
embodiment is connected to the video camera device 20. The video camera device 20 in this case
is provided with the built-in microphone 20a, and the built-in microphone 20a can pick up the
voice together with the captured image to perform recording / recording, but the microphone
input terminal 20b To correspond to audio signal input from an external microphone. Therefore,
as illustrated, the plug on the microphone device 1 side of the present embodiment can be
connected to the microphone input terminal 20b. When the plug on the microphone device side
is inserted into the microphone input terminal 20b in this manner, the video camera device 20
detects this state and invalidates the built-in microphone 20a. The input signal is switched so that
the input voice signal from the microphone device connected to the microphone input terminal
20b becomes valid. In this case, if the windscreen 5 is attached to the microphone device 1, this
is detected and the internal equalizers 13-1 and 13-2 become effective automatically. As a result,
an audio signal corrected for the change in sound quality caused by the attachment of the
windscreen 5 is input to the video camera device 20.
[0048]
Further, as an example in the case where the microphone device 1 of the present embodiment is
integrated with a device capable of recording, an example in which the microphone device 1 is
integrally attached to a video camera device is shown in a perspective view of FIG. In this figure,
the microphone unit 31 is shown attached to the main body of the video camera device 30 in a
form integrated with the video camera device 30. The configuration as the microphone device 1
described above is taken. The microphone unit 31 can attach the wind screen 32 to a portion
corresponding to the microphone grille 3. Also in this case, when the windscreen 32 is attached
to the microphone unit 31, this state is detected, the internal equalizers 13-1 and 13-2 become
effective, and the sound quality change of the collected sound is corrected. It will be done.
Although the microphone device of the present embodiment is combined with a video camera
device in FIGS. 9 and 10 above, audio signals other than video camera devices may be input,
amplified and output, or recorded. It can be combined with various audio devices and audio /
video devices that can
[0049]
08-05-2019
17
It is a side view which shows the example of an external appearance of the microphone
apparatus (wind screen non-mounting | wearing) of embodiment of this invention. It is a side
view which shows the appearance example of the microphone apparatus (wind screen mounting
| wearing) of embodiment. It is the top view and front view which show the example of an
external appearance of the microphone apparatus of embodiment. It is a block diagram showing
an example of circuit composition of a microphone device of an embodiment. It is explanatory
drawing which shows the frequency characteristic of the audio | voice collected by the
microphone apparatus of embodiment. It is a timing chart which shows operation of a circuit of a
microphone device of an embodiment according to a state of wearing / non-wearing of a
windscreen. It is a figure which shows the modification (windscreen non-mounting | wearing) of
the microphone apparatus of embodiment. It is a figure which shows the modification (wind
screen mounting | wearing) of the microphone apparatus of embodiment. It is a figure which
shows the usage example which connects the microphone apparatus of embodiment with
another video camera apparatus. It is a figure which shows the example which integrated and
comprised the microphone apparatus of embodiment with the video camera apparatus.
Explanation of sign
[0050]
DESCRIPTION OF SYMBOLS 1 Microphone apparatus, 2 base parts, 3 microphone grille, 4-1 1st
phototransistor, 4-2 2nd phototransistor, 5, 32 Windscreen, 10-1, 10-2 sound collection unit
part, 11-1, 11-2 preamplifier, 12-1, 12-2 HPF, 13-1, 13-2 equalizer, 14-1, 14-2 switch, 15-1, 152 amplifier, 16 attenuator, 17 integration circuit, 18 comparison , 20, 30 video camera device,
20a built-in microphone, 20b microphone input terminal, 31 microphone unit, 40 magnetic
sheet, 41 magnetic sensor
08-05-2019
18
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