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JPH04132468

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DESCRIPTION JPH04132468
[0001]
FIELD OF THE INVENTION The present invention relates to, for example, video cameras which
can be operated by hand and which can be stereo-recorded. SUMMARY OF THE INVENTION The
present invention relates to, for example, in a video camera which can be operated by hand and
which is capable of stereo recording, the left and right microphones for stereo recording
disposed in the video camera body, and 8 of the left and right microphones. The first and second
variable gain amplifiers to which the force signal is supplied, the setting means for setting the
reference orientation of the video camera body in stereo recording, and the reference set in the
video camera body and set in the main scale And angle detection means for outputting an angle
signal according to the rotation angle of the azimuth angle, wherein the gains of the first and
second variable gain amplifiers are changed according to the angle signal outputted from the
angle detection means. When you play this video camera after panning and recording / recording
it, you hear the playback sound while watching the playback image. It is those that enables audio
playback of high-called terrestris feeling. 2. Description of the Related Art Recently, video
cameras that can be operated by hand and that can be stereo-recorded are widely distributed in
the market. The main reason is that the development of electronics has promoted smaller, lighter,
higher performance, and cheaper video cameras. In particular, a video camera capable of stereo
recording is used when recording and recording at a concert, a presentation, etc., so that a sense
of stereo presence can be reproduced and is considered to be useful. The left and right
microphones for stereo recording in such a prior art video camera are integrally attached to the
video camera body. [Problem to be Solved by the Invention 2 However, with the abovementioned conventional video camera, for example, a car dedicated to the Fl (Formula l) race,
which moves relatively fast, for example, in a racetrack, a stadium, etc. When recording and
recording while panning the video camera with tracking etc. and then playing it back, the
microphone will also be at the same time; since this will be panning, it seems that the center of
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the sound field has suddenly changed in stereo recording and playback One problem is that it
makes it difficult to hear and cause discomfort. The present invention has been made in view of
such a point, and when the video camera main body integrally formed with the left and right
microphones is panning recorded, recorded and then reproduced, the reproduced sound is
viewed while watching the reproduced image. Another purpose is to provide a video camera that
enables so-called high-level 1 audio reproduction.
Means of solving the two problems-The video camera according to claim 1 is, for example, as
shown in the first and fourth countries, the left and right for stereo recording disposed in the
video camera body (1) Microphones (5L), (5R), and the left and right microphones (5L). (5R)
output signal S3. The first and second variable gain amplifiers (15), (11) to which S1 is supplied,
and setting means (8) for setting the reference orientation of the video camera body (1) when
stereo recording is performed; And an angle detection means (9) arranged in the video camera
body (1) for outputting an angle signal according to the rotation angle from the set reference
azimuth, and output from the angle detection means (9) The gains of the first and second
variable gain amplifiers (15, 11) are changed in accordance with the angle signal. According to
the video camera of the present invention, when the video camera body is panned after setting
the reference orientation of the video camera body by the setting means, the angle signal output
from the angle detection means corresponding to the panning is used. Accordingly, the gains of
the first and second variable gain amplifiers connected to the left and right microphones can be
changed, and by this operation, when the video camera body is panned and recorded and then
reproduced, When listening to the reproduced sound while watching the reproduced image, it is
possible to enable so-called stereo high-quality audio reproduction. DETAILED DESCRIPTION OF
THE PREFERRED EMBODIMENTS One Embodiment] An embodiment of the video camera of the
present invention will be described below with reference to the drawings. Note that in the
respective drawings, the same reference numerals are given to corresponding ones. FIG. 4 shows
the appearance of the video camera of this embodiment. In FIG. 4, (1) is a video camera main
body, and a cassette (not shown) is built in the video camera main body (1), and a viewfinder (2)
is attached to the side surface. In addition, a lens (3) and a microphone unit (4) are attached to
the front of the video camera body (1), and the microphone unit (4) has a left channel
microphone (5L) and a right chance, Microphones (5R) are disposed on the left and right.
Further, an orientation sensor (6) such as a rate gyroscope is provided inside the front surface
portion of the video camera body (1). Placing the azimuth sensor (6) in this way on the front of
the video camera body (1) compares the sensitivity of the signal output from the azimuth sensor
(6) when panning the video camera body (1) Because it can be
An output signal from the direction sensor (6) (a velocity signal when the direction sensor (6) is a
rate gyroscope) is, for example, a one-chip microcomputer combination as shown in FIG. , ROM
RAM, and a control circuit (7) having 110 and the like such as an A / D converter and a D / A
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converter. The control circuit (7) is further supplied with a reset signal R from the reset switch
(8), and the control circuit (7) outputs an output signal of the azimuth sensor (6) when the reset
signal 7 is supplied. As a reference, the right channel correction signal CR and the right channel
correction signal CL are output. The azimuth sensor (6) and the control circuit (7) constitute an
angle detection means (9). An output signal S3 according to the volume manually input to the left
channel microphone (5L) is converted into an output signal S4 through a variable gain amplifier
(15) whose gain is AL (φ) as shown in FIG. It is output and supplied to the recording circuit (12).
Similarly, the output signal S1 of the right channel microphone (5R) is converted to the output
signal S2 through the variable gain amplifier (11) whose gain is AR (φ), and output! It is supplied
to the self-recording circuit (12). Here, the right channel correction control signal CR and the left
channel correction control signal C are supplied to the gain control terminals of the variable gain
amplifiers (11) and (15), respectively. The specific configuration of the angle detection means (9)
when the orientation sensor (6) is a rate gyroscope (6A) is shown in FIG. In this figure 2, rate.
The velocity signal V, which is the output signal of the zero scope (6A), is supplied to the
integration circuit (16). The integration circuit (16) starts a new integration operation on the
basis of the arrival of the reset signal R, and supplies the angle signal φ to the correction
function generation circuit (17). This correction function generation circuit (17), as shown in FIG.
3A, is a video camera body (1), therefore, a microphone (5R), The gains AR (φ) and AL (φ) of the
variable gain amplifiers (11) and (15) are shown in FIG. A right channel correction signal CR and
a left channel correction signal CL for changing as shown are output. Next, the operation of the
above embodiment will be described in detail. First, the video camera main body (1) shown in
FIG. 4 is held by hand or fixed to a video camera tripod (not shown) to prepare for shooting.
Therefore, as shown in FIG. 5, in the left side x to the right side XR in FIG. Explain the case of
trying. In this case, with the video camera main body (1) (microphones (5L), (5R)) directed to the
reference azimuth (in FIG. 5, the azimuth in the front direction (hereinafter referred to as
reference azimuth PM) in FIG. 5). By closing the reset switch (8) shown in FIG. 1, the reset signal
R, which is a pulse signal, is supplied to the integrating circuit (16) of the control circuit (7), and
the integrated value of the integrating circuit (16) has a zero value. become. The gains AR (.phi.)
And AL (.phi.) Of the variable gain amplifiers (11) and (15) are shown in FIG. 3 when the video
camera main body (1) faces the reference direction PM in this way. As can be seen from the
characteristic diagram, the gain is controlled to the “middle” gain AR (0), A or 0) (see FIG. 5B).
Then, when the moving body (19) approaches the position of the left side XL from the left side of
the left side x in FIG. 5, the video camera body (1) is panned to the left direction PL. In this case,
the speed signal V (V−dφ / dt, t is time) from the rate gyroscope (6 ^) is integrated by the
integration circuit (16), so that the rotation angle from the reference azimuth PM to the left
azimuth PL φ is calculated. Therefore, based on the rotation angle φ and the residence shown in
FIG. 3B, the correction function generation circuit (17) changes the microphone for the left
channel (in order to increase the level of the output signal S3 output from the fifth day) Make the
amplification factor A of the gain amplifier (15) relatively large (see FIG. 5B), and at the same
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time the level of the output signal S1 output from the microphone (5R) for the right channel The
left channel correction control signal CL and the right channel correction control signal CR are
respectively set to make the amplification factor AR (.phi.) Of the variable gain amplifier (11) be
relatively small (see FIG. 5B). Feed to the control input of the variable gain amplifier (15), (11).
Next, the moving body (19) moves along the right XR in the direction of the left XL in FIG. 5A to
pan the video camera body (1), passes the reference azimuth PM, and rotates to the right azimuth
PR. Move it. In this case, the change of the rotation angle φ is approximately + 40 ° to −40 °,
and the gains AR (φ) and AL (φ) are set to the angle φ as shown in FIG. 3B (see FIG. 5B). It will
change accordingly.
That is, when the video camera main body (1) is panned to the right direction PM, the level of the
output signal S2 is increased by making the gain AR (φ) relatively large to record at the same
time the gain AL (φ) is compared By making the size small, the level of the output signal S4 is
reduced for recording. According to the second embodiment, first, the reference azimuth PM of
the video camera body (1) (microphones (5L), (5R)) is determined, and according to the rotation
angle φ from the reference azimuth PM, For example, as shown in FIG. 3, in the reference
direction PM, the level of the output signals S1 and S3 output from the microphones (5L) and
(5R) is controlled to a medium level, and the left direction (angle When rotating to a direction
where .PHI. becomes a positive value, the level of the output signal S4 applied to the microphone
(5L) of the left channel gradually increases to the left-side predetermined angle .PHI.1, and the
angle .PHI. The peak characteristic is controlled so as to sometimes decrease (while the
characteristic that the level of the output signal S2 decreases to a gradual level). In addition,
when it is rotated to the right side (the direction where the angle φ becomes a negative value)
from the reference direction PM, the level of the output signal S2 applied to the microphone (5R)
of the right channel gradually increases to the right side predetermined angle φ2. The peak
characteristic is controlled such that it becomes smaller when the angle φ becomes larger than
that (while the characteristic that the level of the output signal S4 decreases monotonically).
When playing back a cassette after controlling and recording as in the second case, as shown in
the fifth EmC, in the case where the moving object (19) is an image coming toward the viewer,
the volume (see 21) increases so that the volume (21) from the middle response part is increased
when in the position in front of the viewer's eyes, and the volume (21) on the right side of the
screen is increased when away from the viewer The effect of being able to enable stereo
reproduction with a sense of reality and a sense of discomfort is obtained. In other words, even if
the video camera body (1) is panned following the moving body (19), the microphones (5L) and
(5R) are controlled so as not to pan at equal speed at the same speed. It has the effect of enabling
high-speaking audio reproduction. FIG. 6 is a block diagram showing the configuration of another
embodiment of the present invention. In this example, a geomagnetic sensor (6B) is adopted in
place of the rate gyroscope (6A) in FIG.
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In the example of FIG. 6, the geomagnetic sensor (6B) outputs a geomagnetic azimuth signal
(analog signal) acting on the geomagnetic sensor (6B), and the azimuth signal is output from the
arithmetic circuit (22), for example, digital It is converted to a heading signal of Therefore, when
it is intended to determine the reference azimuth θ0 during panning, the reset signal R is
controlled by the reference azimuth storage circuit (23) by closing the reset switch (8)! Since the
signal is supplied to the terminal Il, the value of the digital azimuth signal supplied to the
arithmetic circuit (22) and the reference azimuth storage circuit (23) at that time is stored as the
reference azimuth θ0. Next, when the video camera main body (1) is panned, the current
azimuth θ1 is calculated by the arithmetic circuit (22), and the rotation angle φ from the
reference azimuth θ0 is φ-θ (− Calculated by θO and supplied to the correction function
generation circuit (17). The correction function generation circuit (17) supplies the right channel
correction signal CR and the left channel correction signal CL based on the characteristics of FIG.
3 to the variable gain amplifiers (11) and (i5) as in the example of FIG. The same effect as in FIG.
2 can be obtained. In the examples shown in FIGS. 2 and 6 described above, the gain of the
variable gain amplifier (11) (15) is changed in accordance with the rotational movement of the
video camera body (1). An output signal S2 between the amplifiers (11), (15) and the allocation
circuit (12). A mixing circuit for mixing S4 may be provided, and the mixing amount of this
mixing circuit may be changed according to the rotation angle φ. Further, it goes without saying
that the present invention is not limited to the above-described embodiment and can take various
configurations without departing from the scope of the present invention. [Effects of the
Invention] As described above, according to the video camera of the present invention, when the
video camera body is panned after setting the reference orientation of the video camera body by
the setting means, the angle detection means corresponding to this panning Since the gains of
the first and second variable gain amplifiers connected to the left and right microphones can be
changed according to the angle signal output from the camera, the video camera body is panned
and recorded and recorded, and then reproduced. In this case, when listening to the reproduced
sound while looking at the reproduced image, it is possible to obtain the advantage that it is
possible to enable so-called high stereo reproduction of audio.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block X showing the configuration of an embodiment of a video camera according to
the present invention, and FIG. 2 is a block diagram showing a specific configuration of angle
detection means in the video camera shown in FIG. Among the angle detection means shown in
FIG. 2, a diagram for explaining the characteristics of the correction function generation circuit,
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FIG. 4 is a perspective view showing an appearance configuration of one embodiment of a video
camera according to the present invention, FIG. 1 and 2 are block diagrams for illustrating the
operation of the example shown in FIG. 1 and FIG. 2, and FIG. .
(1) is a video camera main body, (51), (5R) is a microphone, (6) is an acceleration sensor, (8) is
setting means, (9) is angle detection means, (11), (15) is variable gain The amplifier (12) is a
mixer. Hidetoshi Matsushima Sheng 6A Retla, Iroskofu Fig. 1 Fig. 2 O Office odor Fig. I d
'Oqsula's j j qLM 1 Fig. 4
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