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DESCRIPTION JP2011109650

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DESCRIPTION JP2011109650
An object of the present invention is to suppress an operation noise associated with an operation
in a housing when collecting sound. SOLUTION: A case having a first sound collecting unit for
collecting a sound and outputting a first sound signal, and an operation sound associated with an
operation in the case generates a level of the first sound signal. A first level adjusting unit
configured to lower the predetermined level based on the adjustment parameter, and adjust to
compensate the predetermined level based on the second audio signal output from the second
sound collector attached to the housing; And an output signal generation unit that generates an
output signal based on a second audio signal and the first audio signal adjusted by the first level
adjustment unit. [Selected figure] Figure 2
Voice control device and imaging device
[0001]
The present invention relates to a voice control device and an imaging device.
[0002]
There is a device for reducing the gain of the amplifier only while noise is generated when noise
is generated due to an operation unrelated to video shooting (see, for example, Patent Document
1).
[0003]
Japanese Patent Application Laid-Open No. 8-9317
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1
[0004]
However, in this device, when noise is generated, the gain of the amplifier is lowered, so that not
only noise but normal sound is reduced in the stored audio signal.
[0005]
An object of the present invention is to provide a voice control device and an imaging device
capable of suppressing an operation sound accompanying an operation in a housing when
collecting sound.
[0006]
The voice control device according to the present invention comprises: a case having a first
sound collecting unit that collects a sound and outputs a first sound signal; and an operation
sound associated with an operation in the case is generated; The first level adjustment is
performed to lower the signal level by a predetermined level based on the adjustment parameter,
and to compensate the predetermined level based on the second audio signal output from the
second sound collector attached to the housing And an output signal generation unit configured
to generate an output signal based on the second audio signal and the first audio signal adjusted
by the first level adjustment unit.
[0007]
An imaging apparatus according to the present invention includes the audio control apparatus
according to the present invention, an imaging unit for imaging a subject and outputting an
image signal, the image signal output from the imaging unit, and the imaging unit when imaging
by the imaging unit. And recording means for correlating the output signal outputted by the
voice control device and recording the same on a recording medium.
[0008]
According to the present invention, at the time of collecting sound, it is possible to suppress the
operation sound accompanying the operation in the housing.
[0009]
FIG. 1 is a perspective view showing an appearance of an electronic camera according to an
embodiment.
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2
FIG. 1 is a block diagram showing a system configuration of an electronic camera according to an
embodiment.
It is a flow chart which shows processing of noise reduction AGC concerning an embodiment.
[0010]
Hereinafter, a noise reduction apparatus according to an embodiment of the present invention
will be described with reference to the drawings, taking an electronic camera as an example.
FIG. 1 is a perspective view showing an appearance of an electronic camera according to the
embodiment.
As shown in FIG. 1, the electronic camera 2 includes a lens unit 4 that can be attached to and
detached from a lens mount (not shown).
The lens unit 4 has a plurality of lenses, and in the case of performing auto-focusing, a part of the
lenses is moved in the optical axis direction by driving the AF motor 18.
Further, the electronic camera 2 has a function of capturing still images and moving images, and
the sound of the surrounding environment is collected when capturing moving images on the
right side when viewed from the front of the front of the electronic camera 2 A built-in
microphone 6 is provided which is a monaural microphone.
In addition, on the side surface of the electronic camera 2, a connection unit 10 for connecting
an external microphone 8 which is a monaural microphone similar to the built-in microphone 6
to the electronic camera 2 is provided. It is connected to the electronic camera 2 through the unit
10.
In addition, on the upper surface of the camera 2, a release button 16 is provided which is
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operated when an instruction to shoot an image (still image and moving image) is issued.
[0011]
FIG. 2 is a block diagram showing a system configuration of the electronic camera 2 according to
the embodiment. As shown in FIG. 2, the electronic camera 2 includes a CPU 20, and an external
microphone 8 is connected to the CPU 20 via the built-in microphone 6 and the connection unit
10. The control unit 22 includes an AF motor 18, a release button 16, a shooting mode dial, a
menu button, etc., and a CCD or CMOS for capturing an object light to generate an imaging signal
(analog signal as accumulated charge). Image sensor 24 and image data generated by A / D
converting an imaging signal output from the imaging sensor 24 by an A / D converter (not
shown) and an audio signal collected from the built-in microphone 6 and the external
microphone 8 Connected to the buffer memory 26 for storing audio data based on the image
data, the image processing unit 28 for performing image processing such as white balance
adjustment and contour compensation, and the memory card 30 for storing image files to the
image data stored in the buffer memory 26 It is done.
[0012]
Next, referring to the flowchart shown in FIG. 3, noise reduction auto gain control (hereinafter
referred to as noise reduction AGC) performed by the electronic camera 2 according to the
embodiment. Will be described.
[0013]
First, left and right positions at which the built-in microphone 6 and the external microphone 8
are installed are set by the operation of the menu button or the like by the operator. In this
embodiment, when the moving image is taken, the external microphone 8 is installed on the right
side of the electronic camera 2, so the audio collected by the external microphone 8 is collected
by the right audio (R) and the built-in microphone. Voice is set to the left voice (L). Also, the
moving image shooting mode is set by the operator using the shooting mode dial, and when the
release button 16 is full-pressed, shooting of a moving image is started. In shooting a moving
image, the AF motor 18 is driven to perform autofocus in accordance with the movement of the
subject. Therefore, the CPU 20 determines whether to drive the AF motor 18 (step S11). When
the AF motor 18 is not driven, the level of the audio signal (Lin) input from the built-in
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microphone 6 and the external microphone are determined. A normal auto gain control
(hereinafter referred to as a normal AGC) which is adjusted so that the level of an audio signal
(hereinafter referred to as Rin) input from 8 becomes substantially the same. ) (Step S12). On the
other hand, when the AF motor 18 is driven, noise reduction AGC is performed (step S13). That
is, when driving the AF motor 18, the CPU 20 first adjusts the level of Lin and the level of Rin to
be substantially the same. Then, regarding the sound generated from the AF motor 18, the level
of Lin input from the built-in microphone 6 positioned near the AF motor 18 which is a noise
source is reduced using a preset adjustment parameter, and A part of Rin is added to Lin based
on the amount of reduction. Therefore, an output signal of Lin (hereinafter referred to as Lout)
subjected to the noise reduction AGC processing is represented by Lout = a × Lin + (1-a) × Rin.
Here, a (0 <a ≦ 1) is an adjustment parameter. Also, the output signal of Rin (hereinafter, Rout) is
expressed as Rout = Rin because the noise reduction AGC process is not performed.
[0014]
Then, the processing of steps S11 to S13 is repeated until the shooting of the moving image is
completed. The captured moving image data and audio data on which the normal AGC or noise
reduction AGC processing has been performed are stored in the memory card 30 as a moving
image file of a predetermined format.
[0015]
According to the electronic camera of this embodiment, when the AF motor is driven, the level of
the input signal input from the built-in microphone is reduced based on the predetermined
adjustment parameter, and the external microphone is reduced based on the reduction amount of
the input signal of the built-in microphone. In order to add the input signals of (1), it is possible
to reduce the noise source due to the noise source and record voice while maintaining the state
of stereo recording using the built-in microphone and the external microphone.
[0016]
In the above embodiment, when the AF motor 18 is driven, if the volume generated from the AF
motor 18 changes, the noise reduction AGC process may be performed based on the change in
the volume. .
That is, when a change in sound generated from the AF motor 18 can be predicted, an
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adjustment parameter corresponding to the change in sound is set in advance, and the noise
reduction AGC process is performed using this adjustment parameter. You may
[0017]
In the above-described embodiment, the noise reduction AGC process may be performed on the
sound generated from other than the AF motor 18. That is, regarding noise noise generated from
other than the AF motor 18, an adjustment parameter may be set in advance for each noise
noise, and the process of noise reduction AGC may be performed using this adjustment
parameter.
[0018]
Moreover, in the above-mentioned embodiment, although the electronic camera 2 and the
external microphone 8 are connected by the cable 12, you may perform wireless
communications, such as WiFi, between the electronic camera 2 and the external microphone 8.
FIG.
[0019]
Moreover, in the above-mentioned embodiment, although the process of noise reduction AGC is
implemented in the electronic camera 2, you may implement in apparatuses other than the
electronic camera 2. FIG.
That is, using the device provided with the built-in microphone that is a monaural microphone
that collects the sound of the surrounding environment and the external microphone that is a
similar monaural microphone, based on the sound generated from this device, Processing may be
performed.
[0020]
DESCRIPTION OF SYMBOLS 2 ... Electronic camera, 6 ... Built-in microphone, 8 ... External
microphone, 10 ... Connection part, 18 ... AF motor, 20 ... CPU, 22 ... Operation part, 28 ...
Memory card.
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