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JPH0394599

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DESCRIPTION JPH0394599
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
stereo recording system suitable for use in a stereo video camera, a camera integrated VTR, a
movie camera, a tape recorder and the like. [Description of the Related Art] A conventional stereo
recording (recording) system according to the prior art is described, for example, in ?Hi-Fi Tape
Recorder,? issued by Radio Technology Co., Ltd., pages 563 to 566 and as shown in FIG. On the
other hand, two microphones 50 and 51 are disposed at an appropriate opening angle ?, and
the opening angle ? is manually variably adjusted to perform a realistic recording. [Problems to
be Solved by the Invention] However, in the above-mentioned prior art, even if the distance to the
sound source changes, the open angle ? of the two microphones remains fixed or the change in
the distance to the sound source Accordingly, the opening angle ? had to be manually varied
each time. By the way, with the high-oriented video movies such as video cameras and camera
integrated VTRs, the appearance of products having a stereo recording function has been long
awaited, but the following problems occur when the above-described conventional technology is
followed. That is, if the open angle ? of the two microphones remains fixed, the angle of view of
the photographing lens changes (the lens magnification changes, in other words, the distance to
the subject that is the main target of recording changes) Since the range of the recorded audio is
constant, there arises a disadvantage that the captured video and the recorded range of the audio
do not necessarily coincide with each other, and when the distance to the subject (sound source)
goes away, the clarity of the recorded audio decreases. It is also conceivable to manually adjust
the open angle ? of the two microphones according to the change in the distance to the subject
(sound source), but this operation is very complicated for the user, and the beginner It is difficult
to set an appropriate opening angle ?. The present invention has been made in view of the
above-described point, and the object of the present invention is the distance to an object to be
recorded (pickup) and, in particular, to an object to be a main object of recording when used in a
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camera. In accordance with the distance of the lens and the magnification of the shooting lens,
the opening angle of the two microphones can be automatically changed, thereby providing a
stereo recording method that is easy to use and capable of always good recording. Means for
Solving ciaa In order to achieve the above-described object, the present invention provides an
audio recording system in which audio recording is performed by two microphones for right
channel and left channel up to an object to be recorded. A distance detection means for detecting
a distance and an open angle adjustment drive means for changing the open angle of the two left
and right microphones are provided, and when the distance to the object is long, the open angle
adjustment drive means The opening angles of the two microphones are reduced, and when the
distance to the object is short, the opening angles of the two microphones are increased by the
opening angle adjustment drive means.
Further, in order to achieve the above object, the present invention performs stereo recording of
audio with two microphones for the right channel and for the left channel, and a recording
method in a camera for recording an image by a photographing lens and an imaging unit. The
distance detection means for detecting the distance to the subject to be photographed; the lens
magnification detection means for detecting the magnification of the photographing lens; and the
open angle adjustment drive means for changing the open angle of the two left and right
microphones; When the distance to the object is long or when the magnification of the
photographing lens is high (telephoto side) based on at least one detection information of the
distance detection means or the lens magnification detection means, the open angle The opening
angle of the two microphones is reduced by the adjustment driving means, and the distance to
the object is short or the magnification of the photographing lens is low ( If the angle side) is by
the opening angle adjustment drive means to increase the opening angle of the two microphones.
[Operation] The distance detection means directed in the same direction as the microphone
detects the distance to the object to be recorded, and accordingly, the control if (for example, a
microcomputer) is operated by the opening angle adjustment drive means. Vary the open angle
of the microphone of. Then, when the distance to the object (sound source) is long, the open
angle of the two microphones is made small, and both the microphones are set to be directed to
the far sound source, thereby being blocked by the surrounding sound Instead, the sound to be
recorded can be recorded without losing clarity. Further, in the case of a sound source in which
the distance with which sufficient intelligibility of sound can be secured is short, the open angle
of the two microphones is increased to further enhance the stereo effect. As a result, even if the
distance to the object to be recorded changes, the open angle of the microphone is variably set
automatically to follow the change, and good recording can be always performed with ease of
use. Also, in a camera such as a video movie, control is performed based on detection information
by a distance detection unit that detects a distance to a subject (a sound source serving as a main
target of I sound) or a lens magnification detection unit attached to a photographing lens system.
A device (for example, a microcomputer) variably adjusts the open angles of the two
microphones by the open angle adjustment drive means. If the subject, ie, the sound source that
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is the main target of recording, is far (if the lens magnification is high), then the open angle of the
two microphones should be small, or if the subject is close, The opening angle of the two
microphones is increased. As a result, the angle of view of the image, which changes depending
on the magnification change of the shooting lens, and the range of the audio to be recorded can
be automatically brought close to each other. It becomes possible to record.
The present invention will be described by way of one embodiment shown in FIG. 1 to FIG. FIG. 1
is a block diagram showing the main configuration of an apparatus (for example, a camera
integrated VTR) to which the stereo recording system of the present invention is applied. In FIG.
1, 1 is a directional microphone for right channel (hereinafter referred to as R microphone 1), 2
is a directional microphone for left channel (hereinafter referred to as L microphone 2), these R
microphone 1 and L microphone 2 The voice picked up in the above is converted into an electric
signal, and after appropriate amplification processing, level adjustment and the like by the voice
processing circuits 3 and 4, respectively, the right channel output end 5 and the left channel
output end 6 Each is output to a system. The R microphone 1 and the L microphone 2 are
directed to the object side, and are connected to and held by the opening angle adjusting
mechanism 7 so that the opening angle ? can be variably adjusted. A drive motor 8 serving as a
drive source of the opening angle adjustment mechanism 7 is driven and controlled by the
microcomputer 9 (hereinafter referred to as the microcomputer 9) via the driver circuit 10.
Reference numeral 11 denotes a distance sensor for detecting the distance to a subject (a sound
source serving as a main target of recording). For example, infrared radiation means, and a
plurality of light receptions for detecting reflected infrared light from the subject by the infrared
radiation means It is equipped with an element, and the distance to the subject is measured by a
known triangular distance measurement method. Although not shown, the pressure detection
value information indicating the distance detected and detected by the distance sensor 11 is
subjected to A / D conversion and then sent to the microcomputer 9, and the microcomputer 9
recognizes the distance to the subject. It is supposed to be The distance sensor l1 can use any
known distance detection means other than the above-described example. Reference numeral 12
denotes a photographing lens (zoom lens), which can automatically focus on the subject by a notshown automatic focusing means, or can focus on the subject manually. The light incident
through the photographing lens 12 is received by the image pickup device 13, and the image is
converted into an electric signal by the image pickup device 13, and then passes through the
image processing circuit 14 to be an image signal from the image signal output end 15 as an
image signal. It is sent to the circuit. A lens magnification detection sensor 16 attached to the
magnification adjustment ring or the like of the photographing lens 12 includes, for example, a
potentiometer for detecting the amount of rotation of the magnification adjustment ring from a
reference position. Detection from the lens magnification detection sensor 16 Although not
shown, the signal is A / D converted and then sent to the microcomputer 9. The microcomputer 9
recognizes the lens magnification.
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The lens magnification detection sensor 16 can use any lens magnification detection means such
as a pulse encoder other than the above-described example. FIG. 2 is an explanatory view
schematically showing one example of the opening angle adjusting mechanism 7. In the figure,
reference numeral 8 denotes the drive motor described above, and a worm gear 17 is fixed to the
output shaft 8a. Gears 18.19 are respectively engaged with the worm gear 17. The R microphone
1 is fixed to the gear 8 via the support shaft 20, and the L microphone is fixed to the gear 19 via
the support shaft 21. There is. Therefore, the gears 18 and 19 are rotated by the rotation of the
worm gear 17 by the drive motor 8, and thereby the open angles ? of the R and L microphones
1 and 2 are varied. In recording, the microcomputer 9 recognizes the distance to the subject by
the measurement information of the distance sensor 11 and recognizes the magnification of the
photographing lens 12 by the measurement information of the lens magnification detection
sensor 16. ing. Then, the microcomputer 9 sets a predetermined variable opening angle setting
program based on at least one of the distance information to the object and the lens
magnification information (predetermined distance is one of the angle comparison table and / or
magnification one angle contrast Execute the adjustment process of the inter-microphone angle
(refer to the table). That is, when the subject is far (in other words, when the sound source which
is the main target of recording is far), or when the lens magnification is high (telephoto side), the
microcomputer 9 drives the drive motor 8 through the driver circuit 10. To set the open angle of
the R microphone 1 and the L microphone 2 small as shown in FIG. 3 (a). In FIG. 3, 21 and 22
indicate the directivity characteristics of the microphone 1 and the L microphone, and it is
apparent from FIG. 3 Ca) that, in this state, the directivity of the two microphones 1 and 2 is
comprehensive. However, the sensitivity of the front of the camera is enhanced, so that even if
the subject (sound source) is far away, the intelligibility of the recorded sound is inhibited as
much as possible. become. On the contrary, when the subject is close (in other words, when the
sound source that is the main target of recording is close) or when the lens magnification is low
(wide-angle side), the clarity of the voice to be raised up is sufficient. Since this can be
guaranteed, the microcomputer 9 drives the drive motor 8 through the driver circuit 10, and sets
the open angle of the R microphone 1 and the L microphone 2 small as shown in FIG. 3 (b). In the
state shown in the figure, the overall directivity of the microphones 1 and 2 is expanded, and the
stereo effect is enhanced.
In addition, by variably setting the open angles of the R microphone 1 and the L microphone 2 as
described above, the angle of view of the image, which changes depending on the change in
magnification of the photographing lens, and the range of the audio to be recorded can be
brought close automatically. Therefore, it becomes possible for anyone to easily record in stereo
the sound having a sense of unity with the image to be taken. In general, even if the distance to
the object to be recorded changes, the open angle of the microphone is variably set automatically
following the response, so that good recording can always be performed with good usability. In
the embodiment, the microcomputer 9 is configured to change the open angle of the two
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microphones 1 and 2 with reference to both of the distance information and the lens
magnification information described above, as shown in FIG. This distance and the relationship
between the lens magnification and the microphone opening angle are shown as a graph. In the
example shown in the figure, a zoom lens with a magnification ratio of 8 is used, and the
microphone open angle is set to change in the range of 00 to 60 '. Although the embodiments of
the present invention have been described above, various modifications can be made by those
skilled in the art without departing from the spirit of the present invention, and the present
invention can also be applied to tape recorders other than cameras. Needless to say. According to
the present invention as described above, according to the present invention, the opening angle
of the microphone for the right channel and the microphone for the left channel is automatically
varied according to the distance to the object to be recorded, and the distance is long. In this
case, it is possible to suppress the loss of the clarity of the recorded voice by reducing the
opening angle, and to increase the opening effect by enhancing the stereo effect when the
distance is short. Furthermore, in the case of equipment equipped with a recording function such
as a video movie, the angle of view of the image, which changes depending on the magnification
change of the shooting lens, and the range of the audio to be recorded are automatically brought
close. It becomes possible to easily record in stereo the sound that has a sense of unity with the
image. All in all, good recording is always possible, easy-to-use stereo recording system can be
provided, and its industrial value is high.
[0002]
Brief description of the drawings
[0003]
1 to 4 relate to an embodiment of the present invention, and FIG. 1 is a block diagram showing
the main configuration of an apparatus to which the stereo recording system of the present
invention is applied, and FIG. FIG. 3 is a perspective view schematically showing one example,
FIG. 3 is a diagram showing the relationship between the open angle and directivity
characteristics of two microphones, and FIG. 4 is a diagram showing the relationship between
distance and lens magnification and microphone open angle. A graph and FIG. 5 are schematic
explanatory views showing a conventional example.
1 ииииии Directional microphone for right channel (R microphone), 2 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и Left channel directional microphone (L microphone), 3, 4 и и и и и audio
processing circuit , 5 ..... right channel output end, 6 ..... left channel output end, 7 ..... opening
angle adjustment mechanism, 8 ..... ииииии Microcomputer (microcomputer), 10 иииииииии Driver circuit, l и
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иииииииии Distance sensor, 12 иии Photography lens, 13 ииииииииииииииии Elements 14 ииииии Video processing
circuit 15 ииииии Video signal output end 16 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и и и и и и и и и и и и и и и и и и и и и и и и ..... gear, 20, 21 ...... support shaft. Fig. 2 / Fig. 3 Fig. 4 Distance jl (m)
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