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DESCRIPTION JP2012195922

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DESCRIPTION JP2012195922
Abstract: PROBLEM TO BE SOLVED: To provide a sound collection device that can be mounted on
a small electronic device. A sound pickup apparatus includes a first case 100, a second case 200,
first microphones 111L and 111R, and a second microphone 111C. The second housing 200 can
change its posture with respect to the first housing 100. The first microphones 111 </ b> L and
111 </ b> R output the first audio signal by sound collection. The first microphones 111 </ b> L
and 111 </ b> R are provided in the first housing 100. The second microphone 111 </ b> C
outputs a second audio signal by sound collection. The second microphone 111 </ b> C is
provided in the second housing 200. [Selected figure] Figure 1
Sound pickup device
[0001]
The technology disclosed herein relates to a sound collection device that improves the quality of
an audio signal by performing various types of processing on the input audio signal.
[0002]
In recent years, there has been an increasing demand for miniaturization of electronic devices
equipped with a sound collection device.
When the electronic device is miniaturized, the surface area of the device is reduced along with
the miniaturization. Therefore, it may be difficult to arrange the microphone on the surface of the
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electronic device. Therefore, when there is a space which is not used yet on the movable member
provided in the electronic device, it is conceivable to dispose the microphone on the movable
member. For example, Patent Document 1 discloses a configuration in which a stereo
microphone is provided on a pop-up strobe of a video camera.
[0003]
JP 2003-348419 A
[0004]
In a conventional video camera (hereinafter referred to as a camera), two microphones are
provided on a strobe.
The two microphones are disposed left and right on the strobe so as to obtain directivity in the
left and right direction. However, with these two microphones, it is difficult to obtain directivity
in the direction (depth direction) toward the object to be photographed. Therefore, in order to
obtain directivity in the depth direction, it is conceivable to dispose the microphones in the frontrear direction (optical axis direction). In this case, even if it is attempted to secure a space for
arranging the microphones in the front-rear direction on the strobe, it is difficult to secure this
space further.
[0005]
An object of the technology disclosed herein is to provide a sound collection device that can be
mounted on a small electronic device. Another object of the present invention is to improve the
quality of an audio signal by performing various processes on the input audio signal.
[0006]
The sound collection device disclosed herein includes a first housing, a second housing, a first
microphone, and a second microphone. The second case can change its attitude with respect to
the first case. The first microphone outputs a first audio signal by sound collection. The first
microphone is provided in the first housing. The second microphone outputs a second audio
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signal by sound collection. The second microphone is provided in the second housing.
[0007]
According to the technology disclosed herein, it is possible to provide a sound collection device
that can be mounted on a small electronic device.
[0008]
Front perspective view of digital camera 100 according to Embodiment 1 Rear view of digital
camera 100 according to Embodiment 1 Block diagram showing electrical configuration of digital
camera 100 according to Embodiment 1 Digital camera according to Embodiment 1 Flowchart
showing flow of operation in moving image shooting mode 100 Flowchart showing operation
flow of strobe open / close detection processing of digital camera 100 according to embodiment
1 Flow of operation of voice recording of digital camera 100 according to embodiment 1 FIG. 6 is
a flowchart showing an example of directivity synthesis processing of the digital camera 100
according to the first embodiment. FIG. 6 is a diagram showing details of directivity synthesis
processing of the digital camera 100 according to the first embodiment Shows the positional
relationship between the lens barrel 141 and the microphones 111L, 111R, and 111C. It shows
an example of a front perspective view and a directivity synthesis processing of the digital
camera 100 according to another embodiment
[0009]
Embodiment 1 Next, an embodiment of the present invention will be described using the
drawings.
In the following description of the drawings, the same or similar parts are denoted by the same
or similar reference numerals.
However, the drawings are schematic, and ratios of respective dimensions may be different from
actual ones. Therefore, specific dimensions and the like should be determined in consideration of
the following description. Moreover, it is a matter of course that portions having different
dimensional relationships and ratios among the drawings are included.
[0010]
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In the following embodiments, a digital camera will be described as an example of an imaging
apparatus which is an electronic apparatus equipped with a sound collecting device. In the
following description, the direction toward the subject is “frontward”, the direction toward the
opposite side of the subject is “backward”, and the vertically upward direction is “upper”,
with reference to the imaging device in the normal posture (hereinafter referred to as sideways
posture). Vertically downward is expressed as “downward”, rightward in the state of facing the
subject “rightward”, and leftward in the state of facing the subject “leftward”.
[0011]
The digital camera 100 according to the first embodiment includes a microphone unit 111,
which is picked up by the microphone unit 111 at the time of moving image shooting, and
performs sound recording as well as image recording. The configuration and operation of the
digital camera 100 will be described below.
[0012]
〔1. Configuration] [1-1. Configuration of Digital Camera 100] The configuration of the digital
camera 100 will be described below with reference to the drawings.
[0013]
FIG. 1A is a front perspective view of the digital camera 100 with the strobe 200 closed (stored
in the main body). The digital camera 100 is provided with a lens barrel 141 at its front. The
digital camera 100 further includes an operation unit 180 such as a release button 181, a power
switch 183, and a mode dial 184 on the top surface.
[0014]
The digital camera 100 also has a strobe 200 and a pop-up lever 201 on its top surface.
[0015]
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The digital camera 100 also includes a microphone unit 111 on the top surface thereof.
The microphone unit 111 includes three microphones. The three microphones are configured of
a microphone 111L, a microphone 111R, and a microphone 111C. Among these, the microphone
111 </ b> L and the microphone 111 </ b> R are positioned on the upper surface of the main
body of the digital camera 100 side by side in the left-right direction. Further, the microphone
111C is positioned on the perpendicular bisector of the line connecting the point at which the
microphone 111L is located and the point at which the microphone 111R is located, and in front
of the microphone 111L and the microphone 111R. Also, the microphone 111 </ b> C is located
on the top surface of the strobe 200. When the strobe 200 is closed, the plane including the
three microphones (ie, the microphones 111L and 111R and the microphone 111C) is
substantially parallel to the optical axis of the lens barrel 141.
[0016]
FIG. 1B is a front perspective view of the digital camera 100 in a state in which the strobe 200 is
opened upward (projected upward from the main body). A rotating shaft (not shown) for rotating
the strobe 200 is provided on the upper surface of the main body of the digital camera 100. The
rotation axis extends in the left-right direction behind the strobe 200. By rotating the strobe 200
within a predetermined range about the rotation axis, the front of the strobe 200 is projected
upward, that is, in an open state. With the strobe 200 open, the microphone 111 C moves away
from the top surface of the digital camera 100 by a predetermined amount with reference to the
closed state of the strobe 200. Therefore, when the strobe 200 is open, the plane including the
three microphones (ie, the microphone 111L, the microphone 111R, and the microphone 111C)
and the optical axis of the lens barrel 141 form an angle θ.
[0017]
FIG. 9 is a diagram showing the positional relationship between the lens barrel 141 and the
microphones 111L, 111R, and 111C. FIG. 9A shows a state in which the strobe 200 is closed.
When the strobe 200 is closed, the optical axis of the lens barrel 141 and the plane including the
microphones 111L, 111R, and 111C are substantially parallel. FIG. 9B shows a state in which the
strobe 200 is open. When the strobe 200 is open, the optical axis of the lens barrel 141 and the
plane including the microphones 111L, 111R, and 111C form an angle θ.
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[0018]
As described above, in the case where a plurality of microphones are dispersedly arranged in the
main body of the digital camera 100 and the strobe 200 whose posture changes with respect to
the main body of the digital camera 100, the digital camera Due to the change in the relative
posture between the main body 100 and the strobe 200, the characteristics of the collected
audio signal also change. Therefore, in the digital camera 100 according to the present
embodiment, as described later, the controller 130 determines the control content of the
directivity according to the detection result of the open / close state of the strobe 200 by the
strobe open / close detection unit 202. Then, the digital image / voice processing unit 120
performs directivity synthesis processing on the outputs of the microphones 111L and 111R and
the output of the microphone 111C according to the control content. Thereby, it is possible to
reduce the difference in directivity due to the change in the relative posture of the digital camera
100 and the strobe 200 (change in the open / close state of the strobe 200).
[0019]
Note that the term “posture” shown here is a term including at least one of the orientation and
the position of the strobe.
[0020]
FIG. 2 is a rear view of the digital camera 100.
The digital camera 100 includes an operation unit 180 such as a center button 185 and a cross
button 186 on the back surface thereof. In addition, the digital camera 100 includes a display
unit 190 and a view finder 191 on the back surface thereof.
[0021]
FIG. 3 is an electrical block diagram of the digital camera 100. As shown in FIG. The digital
camera 100 includes an image input system 140, an audio input system 110, a digital image /
sound processor 120, a controller 130, a RAM 150, a strobe 200, a strobe open / close detector
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202, an external storage medium 160, a ROM 170, an operation unit 180, a display unit 190, a
view finder 191, and a speaker 195 are provided.
[0022]
The digital camera 100 generates image information and an audio signal based on information
obtained from the outside. Image information is generated by the image input system 140. The
audio signal is generated by an audio input system 110. The image information and audio signal
generated here are A / D converted, subjected to each processing by the digital image / audio
processor 120, and then recorded in the external storage medium 160 such as a memory card.
The image information recorded in the external storage medium 160 receives the operation of
the operation unit 180 by the user, and is displayed on the display unit 190 and / or the
viewfinder 191. The audio signal recorded in the external storage medium 160 receives an
operation of the operation unit 180 by the user, and is output from the speaker 195.
[0023]
The details of each part shown in FIGS. 1 to 3 will be described below.
[0024]
The image input system 140 includes a lens barrel 141, a lens control unit 142, a CCD image
sensor 143, and an AFE (analog front end) 144.
[0025]
The lens barrel 141 is an optical system having a plurality of lenses.
The lens barrel 141 performs focus adjustment of the subject, adjustment of the angle of view,
adjustment of the amount of incident light, camera shake correction, and the like by a motor
driven according to the control signal notified from the lens control unit 142, and forms a subject
image.
[0026]
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The CCD image sensor 143 captures an object image formed through the lens barrel 141 to
generate image information.
On the light receiving surface of the CCD image sensor 143, a large number of photodiodes are
two-dimensionally arranged (in a matrix). In addition, R, G or B primary color filters
corresponding to each photodiode are arranged. The R, G and B primary color filters are
arranged in a predetermined arrangement structure. Light from an object to be imaged passes
through the lens barrel 141 and is imaged on the light receiving surface of the CCD image sensor
143. The formed object image is converted into respective color information sorted into R, G, or
B according to the amount of light incident on each photodiode. As a result, image information
indicating the entire subject image is generated. Each photodiode corresponds to a pixel of the
CCD image sensor 143. However, the color information actually output from each photodiode is
any one of R, G, and B primary color information. Therefore, the color to be developed in each of
the pixels is the primary color information (color, light quantity) output from the photodiode
corresponding to each pixel and the photodiode in the periphery thereof in the digital image /
sound processing unit 120 in the subsequent stage. Generated based on When the digital camera
100 is in the shooting mode, the CCD image sensor 143 can generate image information of a new
frame at regular intervals.
[0027]
In the AFE 144, noise suppression by correlated double sampling is performed on image
information read from the CCD image sensor 143, amplification to the input range width of the A
/ D converter by the analog gain controller, A / D conversion by the A / D converter Is applied.
Thereafter, the AFE 144 outputs the image information to the digital image / sound processing
unit 120.
[0028]
The strobe open / close detection unit 202 detects whether the strobe 200 is in the open state or
in the closed state, and inputs the detection result to the controller 130. An open / close state is
detected by, for example, providing a switch which is pressed and turned on by the strobe 200
when the strobe 200 is closed and turned off when the strobe 200 is opened, and inputs the on /
off of this switch to the controller 130. Is realized by
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[0029]
The voice input system 110 includes a microphone unit 111 and an analog voice processing unit
115. The microphone unit 111 includes the microphones 111L, 111R, and 111C. The
microphone unit 111 converts an acoustic signal into an electrical signal by each microphone,
and inputs the electrical signal to the analog audio processing unit 115. The analog audio
processing unit 115 performs A / D conversion of the processed audio signal by the A / D
converter, and outputs the converted audio signal to the digital image / audio processing unit
120.
[0030]
The digital image / sound processing unit 120 performs various processes on the image
information output from the AFE 144 and the sound signal output from the analog sound
processing unit 115. For example, the digital image / sound processing unit 120 performs
gamma correction, white balance correction, flaw correction, encoding processing, and the like
on image information in accordance with an instruction from the controller 130. Further, the
digital image / sound processing unit 120 performs various processes on the sound signal in
accordance with an instruction from the controller 130. The digital image / sound processing
unit 120 may be realized by a hard-wired electronic circuit or may be realized by a
microcomputer or the like that executes a program. The digital image / sound processing unit
120 may be realized as one semiconductor chip integrated with the controller 130 or the like.
[0031]
The digital image / sound processing unit 120 performs arithmetic processing on the output of
the microphone unit 111 to perform directivity synthesis processing. FIG. 7 is an example of
directional synthesis processing. The microphone 111L and the microphone 111R are disposed
on the same plane perpendicular to the optical axis of the lens barrel 141. The microphone 111C
is disposed on the vertical bisector of the line segment formed by the microphone 111L and the
microphone 111R. As a result, the microphones 111L, 111R, and 111C form an isosceles triangle
whose base is a line segment formed by the microphones 111L and 111R.
[0032]
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Here, the arrangement of the microphone unit 111 and the directivity synthesis process by the
digital image / voice processing unit 120 will be described in detail with reference to FIG.
[0033]
FIG. 7A is a diagram illustrating the positions of the microphones 111L, 111R, and 111C and the
virtual microphone 111B.
The virtual microphone 111B will be described later. FIG. 7A illustrates the microphones 111L,
111R, and 111C so that the plane including the microphones 111L, 111R, and 111C is parallel
to the paper surface regardless of the open / close state of the strobe 200. The microphones
111L and 111R are arranged side by side in the left-right direction. The virtual microphone
111B is a microphone located virtually on the midpoint of a line segment connecting the
microphones 111L and 111R. The digital image / voice processing unit 120 generates the output
of the virtual microphone 111B by calculating based on the outputs of the microphones 111L
and 111R. A line connecting the microphones 111L and 111R and a line connecting the virtual
microphone 111B and the microphone 111C are perpendicular to each other.
[0034]
The distance between the virtual microphone 111B and the microphone 111C is represented by
a symbol d.
[0035]
The Lch output, Rch output, and Cch output when directivity synthesis processing is executed so
that directivity is given to the left, right, and front using the outputs of the microphones 111L,
111R, and 111C, respectively. It will be output.
[0036]
FIG. 7B is a diagram showing a directivity synthesis process for obtaining an Lch output.
A sound wave coming from the right of the digital camera 100 first reaches the right microphone
111R, and then reaches the left microphone 111L after time τ1.
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Therefore, by delaying the output of the right microphone 111R by this time τ1 and subtracting
this result from the output of the left microphone 111L, the output for the sound wave coming
from the right is canceled. The delay unit 1201 applies a delay of time τ1 to the output of the
microphone 111R. The subtractor 1202 subtracts the output of the delay unit 1201 from the
output of the microphone 111L to obtain an Lch output. By the above processing, an Lch output
having low sensitivity to the sound wave coming from the right side can be obtained.
[0037]
FIG. 7C is a diagram showing directivity synthesis processing for obtaining an Rch output. The
process is the same as that of FIG. 7B except that the left and right are reversed. That is, the
delay unit 1203 applies a delay of time τ1 to the output of the microphone 111L. The
subtractor 1204 subtracts the output of the delay unit 1203 from the output of the microphone
111R to obtain an Rch output. By the above processing, Rch output with low sensitivity to the
sound wave coming from the left can be obtained.
[0038]
FIG. 7D is a diagram showing processing for obtaining the output of the virtual microphone 111B
described in FIG. 7A. By averaging the outputs of the left and right microphones 111L and 111R,
the output of the virtual microphone 111B geometrically located at the center of the left and
right microphones is obtained. The amplifier 1205 halves the output of the microphone 111L.
The amplifier 1206 halves the output of the microphone 111R. The adder 1207 adds the output
of the amplifier 1205 and the output of 1206. Thus, the output of the virtual microphone 111B
is obtained.
[0039]
FIG. 7E is a diagram showing a directivity synthesis process for obtaining a Cch output. The
sound wave coming from the rear reaches the rear microphone, that is, the virtual microphone
111B first, and then reaches the front microphone 111C after time τ2. If the output of the rear
side virtual microphone 111B is delayed by this time τ2 and this result is subtracted from the
output of the front side microphone 111C, the output for the sound wave coming from the rear is
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canceled. The delay unit 1208 applies a delay of time τ2 to the output of the virtual microphone
111B. The subtractor 1209 subtracts the output of the delay unit 1208 from the output of the
microphone 111C to obtain a Cch output. By the above processing, a Cch output with low
sensitivity to a sound wave coming from behind can be obtained.
[0040]
Each output output by the directional synthesis processing described above is expressed as
follows.
[0041]
Lch output; Lch (t) = Lcho (t)-Rcho (t-τ1) Rch output; Rch (t) = Rcho (t)-Lcho (t-τ1) Cch output;
Cch (t) = Ccho (t) −Bcho (t−τ2), Bcho (t−τ2) = Lcho (t−τ2) / 2 + Rcho (t−τ2) / 2 Here, the
actual outputs of the microphones 111L, 111R, 111C, and 111B are Lcho (t). And Rcho (t), Ccho
(t) and Bcho (t), and outputs outputted by the directivity synthesis process are described as Lch
(t), Rch (t) and Cch (t).
Lch (t), Rch (t), and Cch (t) correspond to the Lch output, Rch output, and Cch output described
above.
[0042]
As shown in FIG. 8, each output Lch (t), Rch (t), Cch (t) after the directivity synthesis processing is
delayed by the actual outputs Lcho (t), Rcho (t), Bcho (t). It is determined by delaying by means
1201, 1203, 1208.
[0043]
For example, when new data Lcho (t), Rcho (t) and Bcho (t) are input to delay units 1201, 1203
and 1208, old data Lcho (t-τ1), Rcho (t-τ1) and Bcho are received. (T−τ2) is output.
More specifically, in FIG. 8, the actual outputs Lcho (t), Rcho (t), Bcho (t) are input to the delay
units 1201, 1203, 1208 every half of the delay times τ1, τ2. Ru. When the delay times τ1 and
τ2 elapse, the past actual outputs Lcho (t−τ1), Rcho (t−τ1) and Bcho (t−τ2) are output.
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[0044]
Here, the delay units 1201, 1203 and 1208 are included in the digital image / sound processing
unit 120. For example, when the digital image / voice processing unit 120 has a DSP (Digital
Signal Processor), the above delay processing is performed on a delay memory of the DSP, for
example, on a register of the DSP. As a result, the access speed to the data can be improved
compared to the case where the actual outputs Lcho (t), Rcho (t) and Bcho (t) are stored in the
RAM 150, so that the directional synthesis processing can be speeded up. .
[0045]
Lch output Lch (t), Rch output Rch (t), and Cch output Cch (t) are obtained by executing the
directivity synthesis processing as described above in the digital image / voice processing unit
120. As a result, it is possible to extract only the sound corresponding to the target (target to be
photographed) photographed by the digital camera 100. That is, by excluding the influence of
the backward voice, it is possible to record the voice corresponding to the object to be
photographed as a realistic voice.
[0046]
In FIG. 8, in order to facilitate the description, the actual outputs Lcho (t), Rcho (t) and Bcho (t)
are delayed by delay units 1201 and 1203 every half of the delay times τ1 and τ2,
respectively. Although the example in the case of being input to 1208 was shown, the time
interval in which the real outputs Lcho (t), Rcho (t) and Bcho (t) are input to the delay units 1201,
1203 and 1208 is limited to the above embodiment. It doesn't have to be, and it does not matter.
[0047]
The display unit 190 is disposed on the back of the digital camera 100.
In the present embodiment, the display unit 190 is a liquid crystal display. The display unit 190
displays an image corresponding to the image information processed by the digital image /
sound processing unit 120. Images displayed by the display unit 190 include a through image
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and a reproduced image. The through image is an image of a frame that is continuously newly
generated by the CCD image sensor 143 at fixed time intervals. Normally, when the digital
camera 100 is set in the shooting mode, the digital image / voice processing unit 120 generates
the CCD image sensor 143 when the camera is in a standby state where still image shooting is
not performed or in a moving image shooting state. A through image is generated from the
processed image information. The user can capture the subject while confirming the composition
of the subject by referring to the through image displayed on the display unit 190.
[0048]
The reproduced image is generated by the digital image / sound processor 120 when the digital
camera 100 is in the reproduction mode. The reproduction image is an image obtained by
reducing the recording image of high pixels recorded in the external storage medium 160 or the
like to low pixels in accordance with the size of the display unit 190. The high-pixel image
information recorded in the external storage medium 160 is a digital image / sound processor
120 based on the image information generated by the CCD image sensor 143 after the release
button 181 receives a predetermined operation by the user. Generated by The speaker 195
outputs an audio signal recorded in the external storage medium 160. The display content
displayed by the display unit 190 can also be displayed on the view finder 191.
[0049]
The controller 130 generally controls the operation of the entire digital camera 100.
[0050]
The ROM 170 is a program for the controller 130 to execute, for example, programs related to
auto focus control (AF control), automatic exposure control (AE control), light emission control of
the strobe 200, etc., and overall control of the overall operation of the digital camera 100. Stores
the program etc.
[0051]
The ROM 170 also stores various conditions and settings for the digital camera 100, including
the detection result of the strobe open / close detection unit (the result of detecting whether the
strobe is closed or open).
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In the present embodiment, the ROM 170 is a flash ROM.
[0052]
The controller 130 may be realized by a hard-wired electronic circuit or may be realized by a
microcomputer that executes a program.
Moreover, the controller 130 may be realized as one semiconductor chip integrally with the
digital image / sound processing unit 120 and the like. In addition, the ROM 170 does not have
to exist outside the controller 130 (as a separate body from the controller 130), and may be
incorporated inside the controller 130.
[0053]
The RAM 150 functions as a work memory of the digital image / sound processor 120 and the
controller 130. The RAM 150 can be realized by an SDRAM, a flash memory, or the like. The
RAM 150 also functions as an internal memory for recording image information and audio
signals. The detection result of the strobe open / close detector may be stored in the RAM 150.
[0054]
The external storage medium 160 is an external memory provided with a non-volatile storage
unit such as a flash memory. The external storage medium 160 can record data such as image
information and an audio signal to be processed by the digital image / audio processor 120.
[0055]
The operation unit 180 is a generic term for operation interfaces such as operation buttons and
operation dials disposed on the exterior of the digital camera 100. The operation unit 180
receives an operation by the user. The operation unit 180 includes, for example, the release
button 181, the power switch 183, the mode dial 184, the center button 185, the cross button
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186, and the like shown in FIGS. 1, 2 and 3. When the operation unit 180 receives an operation
by the user, the operation unit 180 notifies the controller 130 of a signal instructing various
operations.
[0056]
The release button 181 is a push-type button that transits to two stages of a half-pressed state
and a fully-pressed state. When the release button 181 is half-pressed by the user, the controller
130 executes AF (Auto Focus) control and / or AE (Auto Exposure) control, etc., to determine the
imaging conditions. In the AF control, the digital image / sound processing unit 120 calculates
the contrast value in a predetermined area of the image information, based on which the
controller 130 drives the lens barrel 141 through the lens control unit 142, and the contrast
value becomes maximum. Do feedback control. As a result of the AF control, the controller 130
obtains the focal length to the subject of the AF control target. Further, as a result of the AF
control, the lens barrel 141 causes the CCD image sensor 143 to form an object image of an AF
control target. Subsequently, when the release button 181 is full-pressed by the user, the
controller 130 records the image information captured at the timing of the full-press on the
external storage medium 160 or the like.
[0057]
The power switch 183 is a sliding switch for turning on / off the power supply to each part of the
digital camera 100. When the power switch 183 is slid to the right by the user when the power is
off, the controller 130 supplies power to each part of the digital camera 100 to activate each
part. When the power switch 183 is slid to the left by the user when the power is turned on, the
controller 130 stops the power supply to each part of the digital camera 100.
[0058]
The mode dial 184 is a rotary dial. When the mode dial 184 is rotated by the user, the controller
130 switches the operating mode of the digital camera 100 to an operating mode corresponding
to the current rotational position of the mode dial 184. The operation mode includes, for
example, an auto shooting mode, a manual shooting mode, a scene selection mode, and the like.
Here, the auto shooting mode, the manual shooting mode, and the scene selection mode are
collectively referred to as a shooting mode.
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[0059]
The center button 185 is a push button. When the central button 185 is pressed by the user
while the digital camera 100 is in the shooting mode or the playback mode, the controller 130
displays a menu screen on the display unit 190. The menu screen is a screen for allowing the
user to set various shooting conditions and playback conditions. When the value of the setting
item of various conditions is selected by the user on the menu screen and the central button 185
is pressed, the setting item is determined to be that value. The determined settings are stored in
the ROM 170.
[0060]
The cross button 186 includes four press-type buttons provided in the up, down, left, and right
directions. The user can select values of setting items of various conditions displayed on the
menu screen by pressing the button in any direction of the cross button 186.
[0061]
The strobe 200 includes a xenon tube. The xenon tube is driven by a capacitor, a booster circuit
and a light emission trigger circuit. The booster circuit applies a high voltage to the capacitor in
accordance with the control signal from the controller 130. The light emission trigger circuit
discharges a high voltage to the capacitor in synchronization with imaging. Specifically, the light
emission trigger circuit discharges a high voltage to the capacitor which has been charged
according to a control signal from the controller 130, and momentarily emits xenon gas in the
xenon tube. Thus, the digital camera 100 can capture an illuminated subject. That is, when the
xenon tube of the strobe 200 emits light momentarily to the subject at the time of imaging, it is
possible to capture an image with the brightness of the subject compensated.
[0062]
The light emission of the xenon tube of the strobe 200 includes pre-emission and main emission.
Pre-emission is emission before shooting. In the pre-issuing, the degree of the amount of
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reflected light from the subject is measured by the emission of the xenon tube, and the distance
to the subject is determined based on the degree of the amount of reflected light. Then, in
accordance with the determination result, the light emission amount of the xenon tube at the
time of photographing is obtained. The main light emission is performed in synchronization with
the timing of photographing with the amount of light emission determined by the pre-light
emission.
[0063]
〔1−2. Correspondence Relationship with the Present Invention] The main body of the
digital camera 100 is an example of the first housing of the present invention. The strobe 200 is
an example of a second housing of the present invention. The microphone unit 111 is an
example of the sound collection unit of the present invention. The microphones 111L and 111R
are examples of the first microphone of the present invention. The microphone 111C is an
example of the second microphone of the present invention. The analog voice processing unit
115 is an example of the voice receiving unit of the present invention. The voice input system
110 is an example of the voice input unit of the present invention. The digital image / sound
processing unit 120 is an example of the directivity control unit of the present invention. The
strobe open / close detection unit 202 is an example of a detection unit of the present invention.
The controller 130 is an example of the control unit of the present invention. The operation unit
180 is an example of a setting unit of the present invention. The display unit 190 is an example
of the display unit of the present invention. The digital camera 100 is an example of the sound
collection device of the present invention. The digital camera 100 is an example of the electronic
device of the present invention.
[0064]
〔2. Operation] Subsequently, an operation in the moving image shooting mode of the digital
camera 100 according to the first embodiment will be described. The digital camera 100 displays
the through image on the display unit 190 in a standby state in the moving image shooting mode
or in a moving image shooting state in which a moving image is being shot. In the following, first,
the flow of the overall operation in the moving image shooting mode will be described using
FIGS. 4 to 6, and then the flow of the operation of the strobe open / close detection processing
will be described. The flow of the operation will be described.
[0065]
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18
FIG. 4 is a flowchart showing an overall flow of the operation in the moving image shooting mode
of the digital camera 100. When the user operates the power switch 183 while the mode dial
184 indicates the moving image shooting mode, the power is turned on. Then, the digital camera
100 enters a moving image shooting mode. The standby state in step S501 includes the through
image display process in step S501a and the strobe open / close detection process in step S501b.
In step S501a, the controller 130 causes the display unit 190 to display the through image
output from the digital image / sound processing unit 120. In step S501b, the strobe open /
close detection unit 202 detects whether the strobe 200 is in a closed state or an open state, and
inputs the detection result to the controller 130. Step S501 is a standby state in the moving
image shooting mode. Next, in step S502, the controller 130 determines whether the release
button 181 has been pressed.
[0066]
When controller 130 determines in step S502 that release button 181 is pressed (Yes in S502),
the moving image shooting operation of step S504 is performed. The moving image shooting
operation of step S504 includes the image recording operation of step S504 v and the voice
recording operation of step S504 a. In the moving image shooting operation of step S504,
recording processing of image information and audio signals for one frame period, for example,
is performed. Note that one frame period is the reciprocal of the frame rate at the time of moving
image shooting, and for example, if the frame rate is 60 frames / second, one frame period is
1/60 seconds. The image recording operation in step S 504 v is as outlined in the description of
the configuration, and the detailed description will be omitted. Further, details of the voice
recording operation in step S 504 a will be described later.
[0067]
Subsequently, in step S505, the controller 130 determines whether the release button 181 has
been pressed. When controller 130 determines in step S505 that release button 181 is not
pressed (No in S505), controller 130 performs a moving image shooting operation for the next
one frame period in step S504. When the controller 130 determines that the release button 181
is pressed (Yes in S505), the controller 130 ends the moving image shooting operation, and
manages the standby state in step S501. As described above, in the moving image shooting
mode, the digital camera 100 performs a moving image shooting operation between the pressing
of the release button 181 and the pressing again.
11-04-2019
19
[0068]
On the other hand, when it is determined in step S502 that the controller 130 has not pressed
the release button (No in S502), the controller 130 determines the shooting mode in step S503.
In step S503, the controller 130 determines whether the current operation mode is a moving
image shooting mode. In step S503, when the controller 130 determines that the operation mode
is the moving image shooting mode (Yes in S503), the controller 130 executes step S501, which
is the start point of the operation of the moving image shooting mode, again. When controller
130 determines in step S503 that the operation mode is not the moving image shooting mode
(No in S503), controller 130 ends the operation of the moving image shooting mode.
[0069]
FIG. 5 is a flow chart showing a flow of operation of the strobe open / close detection process
(step S501b) described in the flow chart of FIG. The flow of the strobe open / close detection
processing will be described below.
[0070]
In step S 701, the strobe open / close detection unit 202 detects whether the strobe 200 is in the
open state or in the closed state, and inputs the detection result to the controller 130.
[0071]
In step S 702, the controller 130 determines whether the strobe 200 is in the open state based
on the detection result of the strobe open / close detection unit 202.
If controller 130 determines in step S702 that strobe 200 is in the open state (Yes in S702), step
S703 is executed. If controller 130 determines in step S702 that strobe 200 is in the closed state
(No in S702), step S705 is executed.
[0072]
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In step S703, the controller 130 updates the strobe open flag stored in the ROM 170 to ON. In
step S705, the controller 130 updates the strobe open flag stored in the ROM 170 to OFF.
[0073]
When one of the processing of updating the strobe open flag to ON in step S703 and the
processing of updating the strobe open flag to OFF in step S705 ends, the operation of the strobe
open / close detection processing ends.
[0074]
FIG. 6 is a flow chart showing the flow of the operation of the voice recording (step S504a)
described in the flow chart of FIG.
The flow of voice recording operation will be described below.
[0075]
In step S601, the analog audio processing unit 115 receives an audio signal output from the
microphone unit 111, performs various types of analog signal processing, and outputs the
processed signal to the digital image / audio processing unit 120.
[0076]
In step S605, the controller 130 accesses the ROM 170 and determines whether the strobe open
flag stored in the ROM 170 is ON.
If the controller 130 determines that the strobe open flag is not ON (Yes in S605), step S606 is
executed. If the controller 130 determines that the strobe open flag is ON (No in S605), step
S607 is executed.
[0077]
11-04-2019
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In step S606, the digital image / sound processing unit 120 performs the directivity synthesis
processing A set in advance in accordance with the value (that is, OFF) of the strobe open flag
read by the controller 130. In this case, since the strobe open flag is OFF, the strobe 200 is
closed. That is, the plane on which the microphones 111L, 111R, and 111C are located and the
optical axis of the lens barrel 141 are substantially parallel as shown in FIG. 9A.
[0078]
Here, the distance between the virtual microphone 111B and the microphone 111C is d, and the
velocity of the sound wave is c. In this case, the time from when the sound wave coming from the
rear reaches the virtual microphone 111B until it reaches the microphone 111C, that is, the
delay amount τ2 of the delay unit 1208 is: τ2 = d / c equation (1) It is set.
[0079]
In step S 607, the digital image / sound processing unit 120 performs the directivity synthesis
processing B set in advance in correspondence with the value (that is, ON) of the strobe open flag
read by the controller 130. In this case, since the strobe open flag is ON, the strobe 200 is in the
open state. That is, the plane on which the microphones 111L, 111R, and 111C are located and
the optical axis of the lens barrel 141 form an angle θ as shown in FIG. 9B.
[0080]
In this case, the time from when the sound wave coming from the rear reaches the virtual
microphone 111B until it reaches the microphone 111C, that is, the delay amount τ2 of the
delay unit 1208 is: τ2 = (d · cos θ) / c It is set to (2).
[0081]
Subsequently, in step 609, a recording process is performed on the audio signal subjected to the
directivity synthesis process as described above.
[0082]
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As described above, by changing the delay time τ 2 to be delayed by the delay device in
accordance with the opening and closing of the strobe 200, the change in directivity due to the
opening and closing of the strobe 200 can be reduced.
That is, by performing the directivity synthesis process shown in FIG. 7, it is possible to reduce
the difference in directivity due to the open / close state of the strobe 200.
[0083]
〔3.
Summary] As described above, the digital camera 100 according to the present embodiment
includes the body of the digital camera 100, the strobe 200 whose position and / or orientation
is variable with respect to the body of the digital camera 100, and digital The microphones 111L
and / or 111R are provided in the main body of the camera 100 and output the first audio signal
by sound collection, and the microphone 111C provided in the strobe 200 and outputting the
second sound signal by sound collection.
[0084]
In this way, when the digital camera is miniaturized, even if the space for arranging the
microphone in the main body of the digital camera 100 is insufficient, the strobe which is a
movable member on the member other than the main body, that is, the main body A microphone
can be arranged on 200. As a result, it is possible to provide a sound collection device that can be
mounted on a small device.
[0085]
Further, in the digital camera 100 according to the present embodiment, the strobe open / close
detection unit 202 for detecting the state of at least one of the position and orientation of the
strobe 200 with respect to the main body of the digital camera 100; A controller 130 that
determines control content of directivity characteristics according to the detection result of the
state, and a digital image / voice processing unit that performs directivity synthesis processing
on the first audio signal and the second audio signal And 120.
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[0086]
In this way, by changing the control content in accordance with the opening and closing of the
strobe 200, it is possible to reduce the change in directivity due to the difference in the opening
and closing state of the strobe 200.
That is, by performing such directivity synthesis processing, it is possible to reduce the difference
in directivity due to the open / close state of the strobe 200.
[0087]
Other Embodiments The present invention is not limited to the above embodiment, and various
embodiments are conceivable. Hereinafter, other embodiments of the present invention will be
collectively described.
[0088]
In the above embodiment, the strobe 200 provided with the microphone 111C is housed in the
body of the digital camera 100 by being rotated within a predetermined range with respect to
the body of the digital camera 100 (closed state), It is assumed to be in a state of being protruded
upward (opened state). However, the strobe 200 may have a variable position and / or
orientation relative to the main body of the digital camera 100. More strictly, the microphone
111C is a movable member with respect to the main body of the digital camera 100 so that at
least one of the position and the orientation changes with respect to the microphones 111L and
111R provided on the main body. A certain strobe 200 may move.
[0089]
In the above embodiment, the main body of the digital camera 100 is provided with the
microphones 111L and 111R, and the output of the virtual microphone 111B is virtually
obtained from the outputs of the microphones 111L and 111R. However, instead of the
11-04-2019
24
microphones 111L and 111R, a microphone 111B 'may be provided. That is, instead of the
virtual microphone 111B, the microphone 111B 'may be provided on the middle point of the line
segment connecting the positions where the microphones 111L and 111R are to be arranged. In
this case, the output of the microphone 111B 'is used instead of the output of the virtual
microphone 111B.
[0090]
In the above embodiment, when the strobe 200 is opened, the Cch output is obtained by setting
the delay amount τ2 of the delay unit 1208 to a value different from that when the strobe 200
is closed. Instead of this, in a state where the strobe 200 is open, the output of the microphone
111L and the output of the microphone 111R may be added to obtain a Cch output without
using the microphone 111c. Alternatively, the Cch output may be adjusted by multiplying the
Cch output obtained here by a predetermined count. When the flash unit 200 is closed, the same
process as that of the above embodiment is performed.
[0091]
In the above embodiment, the three microphones constituting the microphone unit are
configured to form a triangle. In this case, the microphone 111C is disposed on the front side,
and the microphones 111L and 111R are disposed on the rear side. Instead of this, as shown in
FIG. 10A, the microphone 111C may be disposed on the rear side (main body of the digital
camera 100), and the microphones 111L and 111R may be disposed on the front side (strobe
200). In this case, the microphone 111C is provided on the main body of the digital camera 100,
and the microphones 111L and 111R are provided on the strobe 200.
[0092]
In this case, as shown in FIG. 10B, the line is configured so that the output of the virtual
microphone 111B directly enters the adder 1207, and the delay unit 1208 'is disposed at the
output line of the microphone 111C. The Cch output may be obtained by the adder 1207 adding
the output of the delay unit 1208 'of the delay amount τ2 shown in the above equation (2) and
the output of the microphone 111B by the adder 1207.
11-04-2019
25
[0093]
In the above embodiment, the Lch output, the Rch output, and the Cch output are configured by
the directivity synthesis process shown in FIGS. 7 (a) to 7 (e). However, the optical axis directivity
combining process of the lens barrel 141 may have a configuration other than that shown in
FIGS. 7 (a) to 7 (e).
[0094]
In the above embodiment, when the strobe 200 is opened, the delay amount τ2 of the delay unit
1208 is changed to obtain the Cch output. Instead of this, the microphone 111 c may not be used
when the strobe 200 is open. When the flash unit 200 is closed, the same process as that of the
above embodiment is performed.
[0095]
In the above embodiment, the microphones 111L and 111R are disposed in the main body of the
digital camera 100, and the microphone 111C is disposed in the strobe 200. However, if three
microphones are disposed in a distributed manner in the main body of the digital camera 100
and the strobe 200, three in number if the relationship between the position and the orientation
of the strobe 200 is changed by opening and closing the strobe 200. The microphones of may be
arranged in any way. In other words, at least one microphone may be disposed in each of the
main body of the digital camera 100 and the strobe 200. Even if the arrangement is different
from that of the above embodiment, the time τ2 to be delayed by the delay unit may be changed
according to the opening and closing of the strobe 200 so as to reduce the change in directivity
due to the opening and closing of the strobe 200.
[0096]
In the above embodiment, the microphone unit 111 is configured by three microphones.
However, the number of microphone units 111 is not limited to three. It may be configured by at
least two or more microphones.
11-04-2019
26
[0097]
In the above embodiment, the digital camera 100 has been described as an example of the sound
processing apparatus. However, the electronic device may be any electronic device that performs
the same process on the input voice. That is, it may be an apparatus that does not perform
processing related to an image, and may be an electronic device such as a voice recorder, for
example. Further, the movable member for the main body may not be the strobe 200, and
microphones may be dispersedly disposed in the main body and a member movable with respect
to the main body.
[0098]
In the above embodiment, the digital image / sound processor 120 and the controller 130 are
described as having the above-described functions and configurations, but some of the functions
and configurations are included in the other. It is good also as composition.
[0099]
Although the CCD image sensor 143 has been described as an example of the imaging unit in the
above embodiment, the present invention is not limited to this.
That is, the present invention is applicable to other imaging devices such as a CMOS image
sensor and an NMOS image sensor.
[0100]
According to the technology disclosed herein, since it is possible to provide a sound collection
device that can be mounted on a small electronic device, a device that records audio data, such as
a digital camera, movie camera, mobile phone, voice recorder, etc. Is also applicable.
[0101]
Reference Signs List 100 digital camera 110 audio input system 111 microphone unit 111 L
microphone 111 R microphone 111 C microphone 111 B virtual microphone 115 analog audio
processing unit 120 digital image / audio processing unit 130 controller 140 image input system
141 lens barrel 142 lens control unit 143 CCD image sensor 150 RAM 160 external storage
medium 170 ROM 180 operation unit 181 release button 182 zoom lever 183 power switch 184
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mode dial 185 center button 186 cross button 190 display unit 195 speaker 200 strobe 202
strobe open / close detector
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