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JPH04259171

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DESCRIPTION JPH04259171
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
portable VTR with a stereo microphone capable of stereo recording by automatically adjusting
directivity characteristics.
[0002]
2. Description of the Related Art As a conventional portable VTR (Video Tape Recorder), a subject
is imaged by an imaging unit (video camera), and an image captured by the imaging unit is
recorded on a video tape by a recording unit. It is common to have a built-in microphone in order
to record surrounding sounds at the same time as shooting. Here, as a portable VTR, there are
those in which an imaging unit and a recording unit are separated and connected by a cable, or
those in which these are integrated. Also, as the microphone, a stereo microphone having a more
realistic presence of sound compared to a monaural microphone is often used. Furthermore,
there are also devices in which the directional characteristic of the microphone is made variable
and linked to the zoom. This is to narrow or widen the directional characteristics of the
microphone when the zoom lens is in telephoto or wide angle. With such a portable VTR,
zooming in on a distant subject is not affected by ambient noise, It is possible to clearly record
the voice of
[0003]
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1
However, in a portable VTR in which the directivity characteristic of the microphone is made
variable in conjunction with the zoom, the directivity characteristic of the microphone does not
change if the zoom is constant. Therefore, when it is desired to change the sound effect
according to the subject being photographed, that is, the pattern, for example, it is a scene where
the train passes through on the left and right of the screen, or children playing in the central part
of the screen Even in a scene moving so as to spread over the entire screen, the directivity of the
microphone was constant and the sense of reality was poor. In such a case, an external
microphone is connected to the external input terminal attached to the video camera, and the
directionality of the external microphone is changed to adjust the directional characteristics of
the microphone to improve the sense of reality. It can be done.
[0004]
However, connecting an external microphone or changing the direction according to the pattern
is cumbersome and also impairs the mobility of the portable VTR. Furthermore, the directional
characteristic of the built-in microphone was not automatically switched even if it was switched
by zooming. The present invention has been made in view of the above-mentioned prior art, and
according to the movement of a subject being photographed, the directivity characteristic of the
stereo microphone is automatically set, and a portable VTR with a stereo microphone capable of
comfortable video photographing The purpose is to provide
[0005]
SUMMARY OF THE INVENTION The configuration of the present invention for achieving the
above object is an imaging unit for imaging a subject, a stereo microphone for recording voice,
an image imaged by the imaging unit, and the stereo In a portable VTR including a recording unit
for recording audio recorded by a microphone on a video tape, a plurality of detection areas are
set in a screen where an object is captured by the imaging unit, and representative points in the
detection area are set. A motion vector detection unit for detecting a motion vector over time,
and a control circuit for varying the directivity characteristic of the stereo microphone according
to the motion vectors of a plurality of representative points detected by the motion vector
detection unit It features.
[0006]
The present invention will be described in detail with reference to the embodiments shown in the
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2
drawings.
1 to 4 show the circuit configuration of a portable VTR with a stereo microphone according to an
embodiment of the present invention. As shown in the figure, an imaging signal obtained by the
lens 1 which is an imaging unit for imaging a subject and a solid-state imaging device
(hereinafter referred to as a CCD) 2 is input to an imaging signal processing circuit 3 and then A
/ A. While being digitized by the D converter 4 and stored in the field memory 5, it is input to the
motion vector detection unit 6. Thereafter, the data stored in the field memory 5 is read out,
converted to an analog signal by the D / A converter 7, and output as a Y output, an RY output,
and a BY output.
[0007]
On the other hand, the nondirectional microphone 8 and the bidirectional microphone 9 are used
as stereo microphones by mixing the audio signals recorded by them at the mix circuits 10 and
11 by inverting them in a predetermined ratio. ing. The mix circuits 10 and 11 incorporate a
level controller, and the mixing ratio thereof is adjusted by a microcomputer (hereinafter referred
to as a microcomputer) 21 which is a control circuit. The audio signals output from the mix
circuits 10 and 11 are digitized by the A / D converter 12 and stored in the audio memory 13
and then read out and analogized by the D / A converter 14 so that the left channel audio is
generated. It is output as a signal, a light channel audio signal.
[0008]
The left channel audio signal and the right channel audio signal are recorded on a video tape by a
recording unit together with the Y output, RY output and BY output described above. This
recording unit is a general portable VTR. Since it is the same as, here, I omit the explanation.
[0009]
As shown in FIG. 2, the motion vector detection unit 6 comprises a representative point memory
15, a correlation operation unit 16, a correlation value memory 17, a minimum value detection
unit 18, and a controller 19 for controlling these components. It is connected to the
microcomputer 21.
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Here, the screen of the CCD 2 is divided into 35 blocks of 5 rows × 6 columns (horizontal ×
vertical) as shown in FIG. 3 (a), and a total of 6 blocks of these are detection areas (in the figure ,
Shown in black). In the present embodiment, the image is divided into 35 blocks, but can be
divided into any number, and the number of detection ranges may be arbitrary. Here, each
detection area is composed of a large number of correlation points. For example, as shown in FIG.
3 (b), the detection area K is composed of a plurality of correlation points S (Xk-i, Yk-j) which are
separated from the center position by (i, j). The image of the field is taken into the field memory
5 sequentially. Further, as shown in FIG. 3C, a representative point D (Xk, Yk) is set at the center
position of each detection range and stored in the representative point memory 15. The
correlation operation unit 16 sequentially calculates, for each correlation point, the correlation
value between the representative point D (Xk, Yk) of the previous field and the plurality of
correlation points S (Xk-i, Yk-j) of the current field. Do. That is, representative points Dn-1 (Xk,
Yk) of N-1 field stored in representative point memory 15 and representative points (Xk, Yk) of N
field stored in field memory 5 to (i, j) The absolute value of the difference between the distant
correlation points Sn (Xk-i, Yk-j) is determined as follows and used as the correlation value.
[0010]
Correlation value = | Dn-1 (Xk, Yk) -Sn (Xk-i, Yk-j) | [0010] Such a correlation value is a
correlation point separated by all (i, j) within the detection range K. It is calculated for Sn and
stored in the correlation value memory 17. The lowest point of the correlation value is the point
at which the representative point moved with time in the real time field. The minimum value
detection unit 18 obtains coordinates of the representative point moved, that is, coordinates (Xk,
Yk) of the smallest correlation point within the detection range K stored in the correlation value
memory 17 as follows.
[0011]
(X, Y) = MIN {| Dn-1 (Xk, Yk) -Sn (Xk-i, Yk-j) |} This coordinate (X, Y) corresponds to the
representative point (Xk, Yk) It becomes a movement vector of The coordinates (X, Y) calculated
as the movement vectors are output to the microcomputer 21. The microcomputer 21 integrates
a plurality of movement vectors obtained in each detection area to calculate the direction of
movement of the subject in the screen, Understand the speed. Then, the microcomputer 21
adjusts the level controller of the mix circuits 10 and 11 according to the movement of the
subject to adjust the directivity characteristic as a stereo microphone. For example, when the
movement vectors detect that a plurality of children at the center of the screen are dispersed
around the screen, the directivity characteristic of the stereo microphone may be nondirectional.
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On the contrary, when the children dispersed around the screen concentrate at the center, it is
better to be unidirectional. Furthermore, when the train travels across the screen, it is preferable
to follow uni-directionality to the left and right following the progress of the train.
[0012]
Furthermore, in the present embodiment, it is possible to add a special effect to the audio signal
according to the movement of the subject or the like. That is, in accordance with the movement
of the subject detected by the microcomputer 21, the memory controller 22 controls the audio
memory 13, and adds special effects such as echo to the audio signal.
[0013]
In the portable VTR of this embodiment having the above-described configuration, the directivity
characteristic of the stereo microphone is automatically adjusted as shown in FIG. 4 in
accordance with the movement of the subject to be imaged. First, as shown in the figure, when
the imaging signal starts to be written as N field in the field memory 5 through the lens 1, the
CCD 2, the imaging signal processing circuit 3 and the A / D converter 4, each detection is made
in the representative point memory 15. While the representative points of the range are stored,
the correlation operation unit 16 calculates the difference between the representative point D
(Xk, Yk) of the previous field and the correlation point S (Xk-i, Yk-j) of the current field. The
absolute values are sequentially calculated and stored in the correlation value memory 17 as
correlation values. When the writing of the N field is completed, the minimum value detection
unit 18 detects the smallest one of the correlation values stored in the correlation memory 17
and calculates it as a motion vector. The microcomputer 21 grasps the movement of the subject
from the motion vector calculated by the minimum value detection unit 18, adjusts the mixing
ratio of the mix circuits 10 and 11 according to the subject, and changes the directivity
characteristic of the microphone. Furthermore, when a special effect is given by the
microcomputer 21, the voice memory 13 is adjusted through the memory controller 22.
[0014]
As described above, in the present embodiment, the directivity characteristic of the microphone
is automatically changed appropriately in accordance with the movement of the subject to be
imaged, so that it is possible to perform video shooting full of realism. For this reason, it is not
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necessary to connect an external microphone, and the handling becomes very easy. In addition,
since special effects can be added to the voice, it is possible to achieve more effective recording
in combination with the directional characteristics of the microphone.
[0015]
In the above embodiment, the omnidirectional microphone and the bidirectional microphone are
combined and used as a stereo microphone, but a general stereo microphone can also be used.
Also, as adjustment of directivity characteristics, instead of adjusting the mixing ratio of the
nondirectional microphone and the bidirectional microphone, the direction of the microphone
may be mechanically moved.
[0016]
As described above in detail with reference to the embodiments, according to the present
invention, the directivity characteristic of the stereo microphone is automatically set according to
the movement of the subject being photographed, and a comfortable video can be obtained. I can
shoot. This eliminates the need for an external microphone and can enhance the mobility of the
portable VTR. The present invention is applicable not only to a VTR integrated with a camera but
also to a separate VTR separated from a camera.
[0017]
Brief description of the drawings
[0018]
1 is a circuit diagram showing a portable VTR with a stereo microphone according to an
embodiment of the present invention.
[0019]
2 is a circuit diagram showing a motion vector detection unit used in the embodiment shown in
FIG.
[0020]
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3 (a) is an explanatory view showing the division of the whole screen into blocks, FIG. 3 (b) is an
explanatory view showing a correlation point of the detection range, and FIG. 3 (c) is a
representative point of the detection range. FIG.
[0021]
4 is a flowchart showing calculation of motion vectors and adjustment of microphone directivity
characteristics in the above embodiment.
[0022]
Explanation of sign
[0023]
Reference Signs List 1 lens 2 CCD 3 imaging signal processing circuit 4 A / D converter 5 field
memory 6 motion vector calculation unit 7 D / A converter 8 nondirectional microphone 9
bidirectional microphone 10 mix circuit 11 mix circuit 12 A / D converter 13 voice memory 14 D
/ A converter 15 representative point memory 16 correlation operation unit 17 correlation value
memory 18 minimum value detection unit 19 controller 20 SSG 21 microcomputer 22 memory
controller
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