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JP2008166948

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DESCRIPTION JP2008166948
An object of the present invention is to provide an underwater video camera and the like capable
of automatically recording clear voices without taking complicated operations when shooting
moving images underwater. SOLUTION: A microphone 4 for collecting surrounding voice and
outputting a voice signal, a water pressure sensor 5 for detecting a surrounding water pressure
and outputting a result, and an output of the microphone according to an output of the water
pressure sensor The above problem is solved by including an audio signal processing device 7
that performs filtering processing using a filter whose characteristics change, and a recording
device 8 that records an audio signal output from the audio signal processing device. [Selected
figure] Figure 1
Underwater video camera and underwater video camera system
[0001]
The present invention relates to an underwater video camera and an underwater video camera
system, and more particularly to an underwater video camera capable of automatically recording
clear audio without taking complicated operations when shooting moving images underwater.
Camera and underwater video camera system.
[0002]
Patent Document 1 discloses an audio correction device that improves the sound when a video
camera is used underwater.
[0003]
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Patent Document 2 discloses an electronic camera that performs white balance adjustment
according to the depth from the water surface at the time of underwater shooting.
JP-A 5-95500 JP-A 2004-282460
[0004]
However, in conventional video cameras, especially small digital cameras, the audio correction
function is not considered as important as the image correction function, and a large external
device is required to record clear audio. It was necessary to connect a waterproof microphone or
equalizer, or the user had to perform complicated operations according to the environment, or it
was only possible to record audio with a low-quality built-in microphone built into the camera
body. .
[0005]
SUMMARY OF THE INVENTION In view of the problems of the prior art as described above, the
present invention automatically records clear voice in underwater video cameras and underwater
video camera systems without taking complicated operations when shooting moving images
underwater. Intended to be able to
[0006]
In order to achieve the above object, according to the underwater video camera of the present
invention, a microphone for collecting surrounding sound and outputting a sound signal, a water
pressure sensor for detecting the surrounding water pressure and outputting a result, and an
output of the microphone The audio signal processing apparatus performs filtering processing
using a filter whose characteristics change according to the output of the water pressure sensor,
and a recording apparatus that records an audio signal output from the audio signal processing
apparatus.
Further, the underwater video camera according to the present invention comprises a
microphone for collecting ambient sound and outputting an audio signal, and water detection
means for detecting whether the surrounding environment is in the air or in water and
outputting the result. The audio signal processing apparatus performs filtering processing by a
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filter whose characteristics change according to the output of the water detection unit with
respect to the output of the microphone, and a recording apparatus that records an audio signal
output by the audio signal processing apparatus. .
[0007]
In the underwater video camera system according to the present invention, a waterproof housing
having a water pressure sensor for detecting a surrounding water pressure and outputting a
result, a microphone for collecting a surrounding sound and outputting a sound signal and an
output of the microphone A video camera having an audio signal processing device for
performing filtering processing by a filter whose characteristics change according to an output of
the water pressure sensor, and a recording device for recording an audio signal output from the
audio signal processing device; And a signal transmission means electrically connected between
the video cameras so that the output of the water pressure sensor can be transmitted to the
audio signal processing device.
Also, the underwater video camera system according to the present invention detects the
ambient environment whether it is in the air or in the water, and outputs a result as a waterproof
housing having water detection means, and collects the ambient sound and outputs an audio
signal. An audio signal processing apparatus for performing filtering processing by a microphone
that outputs and a filter whose characteristics change according to the output of the water
detection unit with respect to an output of the microphone And a signal transmission means
electrically connected between the waterproof housing and the video camera so that the output
of the water detection means can be transmitted to the audio signal processing device.
In the underwater video camera system according to the present invention, there is provided a
waterproof housing having a microphone for collecting surrounding sound, outputting a sound
signal and a water pressure sensor for detecting the water pressure and outputting a result, and
the output of the microphone. A video camera having an audio signal processing device for
performing filtering processing by a filter whose characteristics change according to the output
of the water pressure sensor, and a recording device for recording an audio signal output from
the audio signal processing device; And a signal transmission unit electrically connected between
the video cameras to transmit the outputs of the microphone and the water pressure sensor to
the audio signal processing apparatus. Further, the underwater video camera system according to
the present invention comprises a microphone for collecting surrounding sound and outputting a
sound signal, and a water detecting means for detecting whether the surrounding environment is
atmospheric or underwater and outputting a result. An audio signal processing device for
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performing filtering processing by a waterproof housing, a filter whose characteristics change
with respect to an output of the microphone according to an output of the water detection
means, and a recording for recording an audio signal output from the audio signal processing
device A video camera having a device; and a signal transmission means electrically connected
between the waterproof housing and the video camera to transmit the output of the microphone
and the water detection means to the audio signal processing device. .
[0008]
According to the present invention, in an underwater video camera and an underwater video
camera system, when capturing a moving image underwater, clear audio can be recorded
automatically without complicated operations.
[0009]
The best mode for carrying out the present invention will be described.
[0010]
FIG. 1 is a block diagram showing the configuration of an underwater video camera according to
a first embodiment.
The video camera 1 is provided with a microphone 4, a water pressure sensor 5, an audio signal
processing device 7 and a recording device 8.
The microphone 4 collects surrounding sound and outputs an audio signal. The water pressure
sensor 5 detects the surrounding water pressure and outputs the result.
[0011]
FIG. 2 is a block diagram showing the configuration of the audio signal processing device 7. The
audio signal processing device 7 has an audio filter 10 and a filter characteristic table 11 as
shown in FIG.
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[0012]
When designing a video camera, using a model with the same or similar shape as this video
camera, measure the transfer function of voice in water of several water pressure, and record the
inverse of the transfer function in the filter characteristic table 11 Keep it.
[0013]
The filter characteristic table 11 gives the sound filter 10 the filter characteristic recorded at the
water pressure closest to the water pressure signal given as an input.
[0014]
The audio filter 10 dynamically sets the filter characteristics given from the filter characteristic
table 11 as the characteristics of the own audio filter 10, performs filtering processing on the
audio input signal, and enables output of an audio output signal.
[0015]
When the user performs an operation such as turning on the video camera 1 or starting
shooting, the outputs of the microphone 4 and the water pressure sensor 5 are transmitted to the
audio signal processing device 7.
[0016]
The audio signal processing device 7 performs an audio filter on the filter characteristics
recorded at the water pressure closest to the output of the water pressure sensor 5 among the
several filter characteristics recorded in the filter characteristic table 11 when designing the
camera as described above. The output of the microphone 4 is subjected to filtering processing
as an audio input signal and output as an audio output signal.
[0017]
The audio output signal is recorded in the recording device 8.
[0018]
FIG. 3 is a block diagram showing the configuration of an underwater video camera according to
a second embodiment.
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As shown in FIG. 3, in the second embodiment, as an alternative to the water pressure sensor 5 of
the first embodiment, a water detection means 6 is used which detects whether the external
environment is in the air or in water and outputs the result It is a structure.
[0019]
The water detection means 6 can be realized by exposing the two metal terminals to the outside
and measuring the impedance between the terminals.
That is, by using the measured impedance or the like instead of the water pressure signal of the
water pressure sensor 5 in the first embodiment, the filtering process as shown in the first
embodiment can be performed.
In this case, although the surrounding water pressure can not be detected in detail as in the case
where the water pressure sensor is provided, it is easier to detect whether the external
environment is in the air or in water than when the water pressure sensor is provided. Will be
able to
[0020]
FIG. 4 is a block diagram showing the configuration of an underwater video camera system
according to a third embodiment.
As shown in FIG. 4, in the third embodiment, the water pressure sensor 5 in the first embodiment
is provided not in the video camera 1 but in the waterproof housing 3 so that the output of the
water pressure sensor 5 can be transmitted to the audio signal processing device 7 The signal
transmission means 2 is provided.
[0021]
The waterproof housing 3 can be attached to the video camera 1 and can make the video camera
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1 waterproof.
Specifically, this can be realized by providing metal terminals respectively on the inside of the
waterproof housing 3 and the outside of the video camera 1 and connecting the metal terminals
when the video camera 1 is set in the waterproof housing 3 .
As a result, the video camera 1 does not have to be provided with waterproof performance, and
the water pressure sensor 5 can be separated from the video camera 1, so that the video camera
1 can be made smaller and lighter.
[0022]
FIG. 5 is a block diagram showing a configuration of an underwater video camera system
according to a fourth embodiment. As shown in FIG. 5, in the fourth embodiment, the water
detection means 6 in the second embodiment is provided not in the video camera 1 but in the
waterproof housing 3 so that the output of the water pressure sensor 5 can be transmitted to the
audio signal processing device 7 The signal transmission means 2 is provided.
[0023]
The waterproof housing 3 can be attached to the video camera 1 and can make the video camera
1 waterproof. Specifically, this can be realized by providing metal terminals respectively on the
inside of the waterproof housing 3 and the outside of the video camera 1 and connecting the
metal terminals when the video camera 1 is set in the waterproof housing 3 . As a result, the
video camera 1 need not be provided with waterproof performance, and furthermore, the water
detection means 6 can be separated from the video camera 1, so the video camera 1 can be made
smaller and lighter.
[0024]
FIG. 6 is a block diagram showing a configuration of an underwater video camera system
according to a fifth embodiment.
[0025]
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As shown in FIG. 6, in the fifth embodiment, the microphone 4 in the third embodiment is
provided not in the video camera 1 but in the waterproof housing 3 so that the output of the
microphone 4 can be transmitted to the audio signal processing device 7 Means 2 is provided.
As a result, not only the water pressure sensor 5 but also the microphone 4 can be separated
from the video camera 1, so the video camera 1 can be made smaller and lighter.
[0026]
FIG. 7 is a block diagram showing a configuration of an underwater video camera system
according to a sixth embodiment.
[0027]
As shown in FIG. 7, in the sixth embodiment, the microphone 4 in the fourth embodiment is
provided not in the video camera 1 but in the waterproof housing 3 so that the output of the
microphone 4 can be transmitted to the audio signal processing device 7. Means 2 is provided.
As a result, not only the water detection means 6 but also the microphone 4 can be separated
from the video camera 1, the video camera 1 can be made smaller and lighter.
[0028]
FIG. 1 is a block diagram showing a configuration of an underwater video camera according to a
first embodiment. It is a block diagram which shows the structure of an audio | voice signal
processing apparatus. FIG. 7 is a block diagram showing a configuration of an underwater video
camera according to a second embodiment. FIG. 10 is a block diagram showing the configuration
of an underwater video camera system according to a third embodiment. FIG. 10 is a block
diagram showing the configuration of an underwater video camera system according to a fourth
embodiment. FIG. 13 is a block diagram showing the configuration of an underwater video
camera system according to a fifth embodiment. FIG. 16 is a block diagram showing a
configuration of an underwater video camera system according to a sixth embodiment.
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Explanation of sign
[0029]
1 Video Camera 2 Signal Transmission Means 3 Waterproof Housing 4 Microphone 5 Water
Pressure Sensor 6 Water Detection Means 7 Audio Signal Processing Device 8 Recording Device
10 Audio Filter 11 Filter Characteristic Table
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