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JPH05328484

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DESCRIPTION JPH05328484
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
video camera equipped with a stereo microphone, and more particularly to a system for doubling
stereo sound effects when photographing an object moving at a predetermined speed.
[0002]
2. Description of the Related Art In general, video cameras equipped with stereo microphones are
well known, and use the video cameras to move fast, particularly in motorcycle races, F1 Grand
Prix races, racetracks or sports arenas, etc. When shooting a race, as the subject moves, the video
camera swings to the left and right to follow, picking up the sound source from the front side of
the stereo microphone, amplifying it with the left and right independent amplifiers, and
recording it on tape ing.
[0003]
SUMMARY OF THE INVENTION When photographing is performed using a conventional video
camera in this manner, the photographed subject or sound image is always displayed on the
screen despite the fact that the subject has passed, for example, from right to left. As it is
positioned at the center and sounds are heard evenly from the left and right, even if sound is
collected with the angle stereo microphone, it sounds monaural and there is no force on dynamic
or speedy sound effects, so it can be used in practice I lose my feeling.
10-05-2019
1
In particular, such a phenomenon appears notably when shooting at a racetrack. And, in order to
avoid such a situation, it is conceivable to use, for example, an external microphone, but it is
extremely troublesome to prepare the external microphone when considering the portable
telephone etc.
[0004]
Therefore, the video camera equipped with the conventional stereo microphone has a problem
that it must be solved to bring out a sense of stereo not only on the screen but also acoustically
when shooting a moving subject.
[0005]
SUMMARY OF THE INVENTION As a specific means for solving the problems of the prior art, the
present invention is a video camera equipped with a stereo microphone, which comprises an
angular velocity detection sensor, and from the predetermined position to the right and left
When the angular rotation is detected by the angular velocity detection sensor when it is rotated
by a predetermined angle in the direction, the detection is used to control the gain of the
microphone amplifier corresponding to the rotational direction, and the stereo sound effect
amplification in the video camera The present invention provides a system, wherein the
predetermined position is set as a reference position by a preset switch, and an integrating
circuit is provided to correspond to an angular rotation detected by the angular velocity
detection sensor, and a rotation direction and its rotation angle amount Are counted and output
to control the gains of the left and right microphone amplifiers.
[0006]
[Function] Using an angular velocity detection sensor, for example, facing the front to be
photographed and pressing the reset switch to set the reference direction, the angle of rotation of
the right angle or left direction from the reference direction is the angular velocity The gains are
detected by the detection sensor and the gains of the left and right microphone amplifiers are
controlled based on the direction of rotation and the amount of rotation angle, so the right
channel microphone amplifier is made to gain when it turns to the right from the reference
position. When facing the direction, the microphone amplifier of the left channel is made to gain,
and even if the moving sound image is positioned at the center of the screen, it is possible to
produce stereophonic sound effects corresponding to the moving state.
[0007]
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2
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in
more detail by way of the illustrated embodiment. Reference numeral 1 denotes an angular
velocity sensor, for example, a commercially available piezoelectric vibratory gyroscope is used.
Then, the output from the angular velocity detection sensor is integrated by the integration
circuit 2, and a signal of either rightward rotation or leftward rotation is output.
[0008]
In this case, the integration circuit 2 is provided with a reset switch 3 for setting a reference
value or a reference position, and is set at a substantially central position of a range to be
photographed.
Therefore, the signal output from the integration circuit 2 counts plus or minus the set reference
value and outputs it.
[0009]
This output is input to the rotation angle output circuit 4, and the rotation angle output circuit
outputs an output of rotation in the left direction or rotation in the right direction and an angle
amount in the rotation direction.
[0010]
The output signals of the rotation direction and the angle amount are input to the correction
voltage generation circuit 5, and the correction voltage generation circuit controls the gains of
the left and right microphone amplifiers.
That is, if the input signal is rotated in the left direction, a predetermined gain voltage is given to
the amplifier gain control 7 of the left channel, and if the input signal is rotated in the right
direction, the right channel By giving a predetermined gain voltage to the amplifier gain control
8, the amount of gain of the left and right microphone amplifiers is controlled.
10-05-2019
3
[0011]
This situation will be described in more detail with reference to FIG. 2. When the video camera
10 adopting the stereo effect doubling method according to the present invention is used, for
example, when shooting a car race, Assuming that the car 11 travels from the right to the left,
when the photographer turns to the front at the photographing location, the reset switch 3 is
pressed to determine the reference value in the integration circuit 2.
The video camera 10 is a stereo microphone system equipped with the right microphone 12 and
the left microphone 13.
[0012]
If the right direction from the set reference value or the reference position Y-Y is on the plus side
and the left direction is on the minus side, the angular velocity of the rotation when the video
camera 10 is set to the position 10a shifted to the right by a predetermined angle Is detected by
the detection sensor 1 and a signal indicating that it is oscillated by a predetermined angle on the
plus side is output as a pulse signal, for example.
[0013]
This output signal is counted by the integration circuit 2 as a pulse signal of how much it is
shifted to the positive side from the previously set reference value, and based on the count
amount, for example, a strong or weak or level signal is used as the positive side rotation angle
signal. Output.
[0014]
The rotation angle output circuit 4 outputs a signal of a level corresponding to the rotation angle
according to the judgment as to whether it is a plus-side signal and the strength or level thereof,
and the correction voltage generation circuit 5 The amplifier gain control 7 of the channel is
driven to increase the gain of the microphone amplifier. When the video camera 10 is directed to
the right from the reference position, the amplifier gain of the right microphone 12 is high.
[0015]
Conversely, when the video camera 10 is swung from the reference position Y-Y to the
predetermined position 10b in the left direction, the angular velocity detection sensor 1 detects it
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4
and sends out a pulse signal on the negative side, and the integration circuit as described above 2
and output as a rotation angle signal on the negative side by the rotation angle output circuit 4
and drive the amplifier gain control 7 of the left channel by the correction voltage generation
circuit 5 to gain the microphone amplifier, and the video camera 10 is used as a reference The
amplifier gain of the left microphone 13 becomes high when it faces to the left from the position.
[0016]
In short, using the angular velocity detection sensor 1, for example, the user faces the front to be
photographed and presses the reset switch 3 to determine the reference direction, and detects
the rotation angle of turning right or left from the reference direction. For example, the gains of
the left and right microphone amplifiers may be controlled based on the rotation angle detected
by the sensor 1 in the same manner as, for example, the panbot function of the audio mixer.
[0017]
Then, when photographing a car race, as shown in FIG. 2, if the video camera 10 is swung to the
right, the amplifier gain of the right microphone 12 in the stereo microphone becomes high, and
the subject, ie, the racing car 11 gradually If you follow the approach to Y-Y and swing from right
to left, the amplifier gain of the right microphone 12 gradually decreases, and at the reference
position, the amplifier levels at the left and right microphones 12 and 13 become equal, further
When the user shakes to the left beyond the reference position, the amplifier gain of the left
microphone 13 increases.
[0018]
As described above, when shooting a moving subject with a video camera, the reference position
is set in advance, and when the camera is shaken to the right from the reference position, the
microphone amplifier of the right channel is gained and the camera is shaken to the left By
making the left channel microphone amplifier gain, even if the subject or sound image is located
at the center of the screen, the sound on the right is loud when shooting facing the right, and the
sound on the left is shooting when shooting the left. As the sound gets louder, when this is taken
in series and played back, the sound heard from the right moves to the left as the racing car
passes from the right to the left, the stereo effect is enhanced, and a sense of presence is exhaled
It is
[0019]
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5
The above-described angular velocity sensor 1 can use, as it is, the angular velocity sensor in the
"shake correction device" described in, for example, Japanese Patent Application No. 4-16968
filed by the same applicant.
That is, if the video camera is equipped with a camera shake correction device in advance,
camera shake correction and a stereo effect doubling method can be simultaneously provided
only by incorporating an integration circuit and the like in addition thereto.
[0020]
In this case, the output of the integration circuit 2 does not become so large even if a slight
vibration occurs due to hand movement, and the gain of the microphone amplifier does not work
unless the reference position for taking a moving object is set. Depending on the camera shake, it
has almost no effect on the stereo effect, and even with camera shake, it is almost negligible.
[0021]
Furthermore, as an angular velocity detection sensor, geomagnetism can also be used, for
example.
Even in this case, the same is true in setting the reference position using the integration circuit 2.
[0022]
As described above, the stereo sound effect doubling system in the video camera according to the
present invention is a video camera equipped with a stereo microphone, and is provided with an
angular velocity detection sensor, and rightward and leftward from a predetermined position.
When the angular rotation is detected by the angular velocity detection sensor when it is rotated
by a predetermined angle in the direction, and the gain of the microphone amplifier
corresponding to the rotational direction is controlled by the detection, the video camera is
swung left and right. Even if the moving subject or sound image taken is located at the center of
the screen, the sound on the right is gained when the subject is on the right at that shooting
position, and the sound on the left is gained when it comes to the left Can create a stereo sound
effect corresponding to the movement state, and can fully enjoy the sense of reality Exhibits an
excellent effect say.
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[0023]
Also, at the time of shooting a moving subject, a predetermined position, that is, the front
position, is set as a reference position by the preset switch, and the video camera is swung from
the reference position to the left and right. Becomes monaural, and the left and right are
sequentially enlarged, so that stereo sound effects can be further enhanced.
[0024]
Furthermore, an integration circuit is provided to count and output the rotation direction and the
rotation angle amount corresponding to the angle rotation detected by the angular velocity
detection sensor, and to control the gains of the left and right microphone amplifiers. It produces
an excellent effect that the gain can be controlled with certainty.
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7
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