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JPH06303692

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DESCRIPTION JPH06303692
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speech processing apparatus for processing speech.
[0002]
2. Description of the Related Art Conventionally, there has been a microphone called a mid-side
system as a microphone used in, for example, a camera integrated type VTR or the like. The
conventional mid-side microphone has a so-called zoom microphone function by changing its
directivity in accordance with the change in the angle of view of the photographing lens. FIG. 6 is
a diagram showing the configuration of a conventional mid-side microphone.
[0003]
In FIG. 6, reference numerals 601 and 602 denote a mid microphone and a side microphone
which respectively constitute a mid-side microphone. In the figure, the dotted line 603
represents the directivity of the mid microphone 601, and has unidirectionality in the front
direction indicated by the arrow 605 in the figure. The dotted line 604 represents the directivity
of the side microphone 602, and has bidirectionality in the direction perpendicular to the
direction of the arrow 605 in the figure. The signal output from the microphone 601 is
multiplied by the coefficient K in the coefficient multiplier 606 and input to the matrix circuit
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608. The signal output from the microphone 602 is multiplied by the coefficient (K−1) in the
coefficient multiplier 607 and similarly input to the matrix circuit 608. Then, the 1 output
terminal 609 and the r output terminal 610 of the matrix circuit 608 are sent as stereo audio
signals to the recorder section or the like of the VTR in the subsequent stage (not shown).
[0004]
The control circuit 611 controls the angle of view of the zoom lens 612 and changes the
coefficient value K of the coefficient multipliers 606 and 607 in accordance with the position of
the variable magnification optical system of the zoom lens 612.
[0005]
Here, when the output of the mid microphone 601 is L + R and the output of the side
microphone 602 is L−R, the output of the matrix circuit 608 is l = K × (L + R) + (1−K) × (LR) r
= K x (L + R)-(1-K) x (L-R) 0 K K 1 1
[0006]
FIG. 7 shows an example of the relationship between the position of the variable magnification
optical system in the zoom lens 612 and the coefficient value K. As shown in FIG.
[0007]
In the case of the example shown in FIG. 7, when the zoom lens 612 is at the wide end (W), K =
0.5, and the outputs of the l output terminal 609 and the r output terminal 610 of the matrix
circuit 608 are l = 0.5. X (L + R) + (1-K) x (L-R) = Lr = 0.5 x (L + R)-(1-K) x (L-R) = R and so-called
ordinary stereo audio signal .
When the zoom lens 612 is at the tele end (T), K = 1 and the outputs of the l output terminal 609
and the r output terminal 610 of the matrix circuit 608 are l = 1 × (L + R) + (1-K) × ( L−R) = L +
Rr = 1 × (L + R) − (1−K) × (L−R) = L + R, and the directivity of the mid microphone 601, that
is, a monaural signal due to uni-directionality.
[0008]
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The conventional mid-side microphone is configured in this way to become stereo sound with a
wide sense of sound when the image pickup screen is wide and with monaural sound with a
suppressed spread of sound when the image pickup screen is tele. Because it will be.
It is possible to obtain an effect in which the captured image and the sound are integrated.
[0009]
By the way, the focal length on the telephoto side tends to increase as the magnification of the
zoom lens increases.
Furthermore, there are devices that have a function called an electronic zoom, an electronic
telecon, or the like that reduces the apparent imaging angle of view obtained by enlarging a part
of the captured image by video signal processing to a narrow angle. In the case of such a device,
in order to obtain a voice integrated with the extent of the imaging angle of view, a directivity of
a narrow angle is required. However, in the conventional mid-side microphone, merely setting
the coefficient value K in the coefficient multipliers 606 and 607 shown in FIG. There is a
problem that the sense of unity between the captured image and the sound is not sufficient for a
captured image which is captured using a lens with a longer focal distance or which is partially
enlarged by video signal processing.
[0010]
An object of the present invention is to solve the conventional problems as described above, and
to provide a voice processing apparatus having a sound pickup characteristic of voice with a
more realistic feeling and a low cost configuration.
[0011]
According to a first aspect of the present invention, there is provided a voice processing
apparatus according to the first aspect of the present invention, comprising: a first sound
collecting unit having directivity with respect to a first direction and capable of changing the
directivity; Is provided with second sound collecting means having directivity with respect to
different second directions.
[0012]
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According to the above-described configuration, it is an object of the present invention to provide
a voice processing apparatus having a simple, low-cost configuration and having a more realistic
sound collection characteristic of voice.
[0013]
The present invention will now be described by way of examples of the present invention.
[0014]
FIG. 1 is a block diagram showing an embodiment of the present invention, and the same parts as
in FIG. 6 are given the same reference numerals.
[0015]
First, the dotted line 103 in the figure represents the directivity similar to that of FIG.
On the other hand, the directivity shown by the dotted line 113 represents the directivity of a
narrow angle as compared with the directivity shown by the dotted line 103, and the directivity
shown by the dotted line 114 further represents the directivity of the narrow angle.
That is, the mid microphone 101 has three types of directivity.
Here, the control circuit 111 changes the coefficient values K of the coefficient multipliers 106
and 107 according to the position of the variable magnification optical system in the zoom lens
112 as in the case of FIG. The directivity of the microphone 101 is changed from the state shown
by the dotted line 103 to the state shown by the dotted line 114 so as to have a narrow angle.
This operation will be further described with reference to the drawings.
[0016]
FIG. 2 is a view showing the relationship between the position of the variable magnification
optical system in the zoom lens 112 of FIG. 1 and the directivity of the mid microphone 101. As
shown in FIG.
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[0017]
First, when the zoom lens 112 is at the wide end 201, the directivity of the mid microphone 101
has a characteristic shown by a dotted line 103 as in FIG.
From this point, when the variable magnification optical system in the zoom lens 112 is moved to
the tele end 202 side, the coefficient value K in the coefficient multipliers 106 and 101 changes
from “0.5” to “1”.
Then, when the position of the variable magnification optical system in the zoom lens 112
reaches the first predetermined position 203, the directivity of the mid microphone 101 is
switched to the characteristic shown by the dotted line 113. When the zoom lens 112 is further
moved to the tele end (T) side 202 and reaches the second predetermined position 204, the
directivity of the mid microphone 101 is switched to the characteristic shown by the dotted line
114. That is, when the variable magnification optical system in the zoom lens 112 is moved to
the predetermined position 203, the same effect as the conventional example shown in FIG. 6 is
obtained, and after the coefficient value K in the coefficient multipliers 106 and 101 becomes 1,
The directivity of the microphone 101 gradually narrows.
[0018]
Next, an example of a method of changing the directivity of the mid microphone 111 will be
described with reference to FIG.
[0019]
In FIG. 3, microphone units 301 to 304 constituting the mid microphone 111 are connected to
delay elements 306 to 309, respectively.
Here, assuming that the installation interval of each microphone unit is p and the sound speed is
c, the delay amount of each delay element is 4 × p / c for delay element 306, 3 × p / c for delay
element 307, and 2 for delay element 308. Xp / c, the delay element 309 is p / c. In the figure,
switches 310 and 311 are switches for changing the directivity, and coefficient multiplier 312 is
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such that when the directivity of the mid / microphone is switched, the multiplication coefficient
value is made to make the levels of the signals obtained in the respective directivity uniform. It is
configured to be set.
[0020]
Reference numerals 313 to 315 in the figure denote adders.
[0021]
Here, the switches 310 and 311 and the coefficient multiplier 312 are controlled by the control
circuit 111 shown in FIG. 1 as follows.
[0022]
First, when the zoom lens 112 is between the position of the wide end (w) 201 shown in FIG. 2
and the first predetermined position 203, the switches 310 and 311 are both in the OFF state.
At this time, the coefficient value in the coefficient multiplier 312 is set to “15”.
Next, when the zoom lens 112 is between the first predetermined position 203 and the second
position 204 shown in FIG. 2, the switch 310 is turned on and the switch 311 is turned off. At
this time, the coefficient value in the coefficient multiplier 312 is set to "5". When the zoom lens
112 is between the second predetermined position 204 shown in FIG. 2 and the tele end (T) 202,
both switches 310 and 311 are turned on, and the coefficient value in the coefficient multiplier
312 is It is set to "3". In the figure, the direction of the arrow 313 indicates the direction of the
front of the mid microphone 101.
[0023]
Next, an example of a method of detecting the position of the variable magnification optical
system in the zoom lens 112 will be described with reference to FIG.
[0024]
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In the drawing, reference numeral 401 denotes a lens barrel portion of a zoom lens 112 which
rotates and feeds out and zooms, and a reflecting plate 403 is attached around a position 402 in
the drawing.
A position detector 404 includes two pairs of photodiodes and phototransistors 405 and 406.
Here, when the lens barrel is rotated for zooming, the phototransistors of both sets 405 and 406
are in the ON state in the portion a of the reflection plate 403, and this is set as a code "11". In
the portion b of the reflecting plate 403, only the phototransistor of one set 406 is in the ON
state, which is a code "10". Then, in the portion c of the reflection plate 403, only the
phototransistor of one set 405 is in the ON state, and this is set to the code "01". The control
circuit 111 detects the content of this code to detect the position of the variable magnification
optical system in the zoom lens 112.
[0025]
The portion a of the reflecting plate 403 is between the wide end (w) 201 shown in FIG. 2 and
the first predetermined position 203, and the portion b is the first predetermined position 203 to
the second predetermined position 204. And a portion of c is provided between the second
predetermined position 204 and the tele end (T) 202. The control circuit 111 can detect the
position of the variable magnification optical system in the zoom lens 112 by detecting the
content of this code.
[0026]
With the above-mentioned configuration, a mid-side microphone with variable directivity and a
long focal length lens is used to collect a sound having a sense of unity with a narrow captured
image of a field angle. be able to.
[0027]
(Other Embodiments) As another embodiment of the present invention, when a part of a captured
image is enlarged by a function such as so-called electronic zoom or electronic telecon by video
signal processing, a mid microphone is used in a mid microphone type microphone. It is also
conceivable to change the directivity of the light into a narrow angle.
[0028]
FIG. 5 shows an example of the operation of video signal processing for enlarging a part of a
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captured image.
[0029]
In the figure, when the portion 501 is enlarged to make the size of the full size front 502, the
pixels 503 in the portion 501 are repeated in the horizontal direction and the vertical direction
by a predetermined number like the pixel group 504. The same processing is performed on the
pixels and the subsequent pixels to form a partially enlarged captured image.
[0030]
Then, by controlling the connection operation of the switch 310 or 311 shown in FIG. 3 and the
setting operation of the coefficient value in the coefficient multiplier 312 according to the
operation of the partial enlargement function of the captured image, partial enlargement is
performed by video signal processing. It becomes possible to collect sound having a sense of
unity with the captured image.
[0031]
As described above, according to the present invention, it is possible to provide a voice
processing apparatus having a more realistic sound collecting characteristic of voice with a
simple and low-cost configuration.
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