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JP2005176138

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2005176138
PROBLEM TO BE SOLVED: To provide a voice recording and reproducing apparatus capable of
eliminating voice imbalance and accurately reproducing voice direction even at the time of
vertical shooting. SOLUTION: A method of using a microphone element included in an apparatus
is switched according to a direction in which a photographer uses an audio recording and
reproducing apparatus. For example, the mode (monaural sound / stereo sound) of the audio
signal to be recorded on the recording medium 109 is selected according to the imaging mode
(longitudinal photographing / normal photographing) of the photographer. That is, at the time of
normal shooting, stereo sound with directivity given to the recording medium 109 is recorded
and reproduced, and at the time of vertical shooting, monaural sound is recorded on the
recording medium 109, and stereo sound is converted by the pseudo stereo formation circuit
112. Output. [Selected figure] Figure 1
Voice recording and reproducing apparatus and voice recording and reproducing method
[0001]
The present invention relates to an audio recording and reproducing apparatus and an audio
recording and reproducing method mounted on, for example, a video camera or the like.
[0002]
Conventionally, for sound recording with a microphone incorporated in a video camera, a method
has been adopted in which two unidirectional microphone elements are arranged at an angle (see
Patent Document 1).
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This has the advantage of being able to enhance the directivity of the sound at the time of
shooting, and to function advantageously for the sound source of the subject. UnexaminedJapanese-Patent No. 2003-259479
[0003]
However, in the above-described conventional audio recording method, for example, as shown in
FIG. 6A, the video camera 500 having two unidirectional microphone elements 501 and 502 is
rotated by 90 degrees, as shown in FIG. In the case of shooting conditions as shown (longitudinal
shooting), when reproducing a signal recording the video and audio, it is captured from above by
the microphone element 501 from the right channel of the playback device of the video camera.
The recorded audio is played back. Similarly, from the left channel of the playback device of the
video camera 500, the audio captured and recorded from below by the microphone element 502
is played back. Therefore, there has been a problem that when performing voice recording while
using such a microphone characteristic during vertical shooting, the direction of the voice can
not be reproduced correctly.
[0004]
SUMMARY OF THE INVENTION In view of the above-described conventional problems, the
present invention can eliminate voice imbalance even during vertical shooting, and can
accurately reproduce the voice direction, and a voice recording / playback apparatus, and voice
recording / playback. Intended to provide a method.
[0005]
In order to achieve the above object, an audio recording and reproducing apparatus according to
the present invention is an audio recording and reproducing apparatus that processes audio
signals input from a plurality of nondirectional microphone elements, and records and
reproduces on a recording medium. Device direction detecting means for detecting the direction
of use of the voice recording and reproducing device is provided, and a microphone element to
be used is selected from the plurality of microphone elements according to the detection result of
the device direction detecting means. Do.
[0006]
Further, the device direction detecting means is characterized in that it has a configuration for
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detecting whether the voice recording and reproducing device is in a state of being rotated at a
predetermined angle.
[0007]
When it is detected that the voice recording / reproducing device is in a state of being rotated at
a predetermined angle as a detection result of the device direction detecting means, only one of
the plurality of microphone elements is used. The obtained monaural audio signal is recorded on
the recording medium.
[0008]
In addition, when it is detected that the voice recording and reproducing device is in a state of
being rotated at a predetermined angle as a detection result of the device direction detecting
means, only one microphone element of the plurality of microphone elements is used. And
recording the monaural sound signal obtained as a result and the detection result of the device
direction detection means on the recording medium.
[0009]
Further, the reproduction signal output from the recording medium includes means for
determining whether the detection result of the device direction detection means is included, and
the detection result of the device direction detection means is included. In the case where it is
determined that the present invention is characterized in that it comprises means for performing
stereo processing on the monaural audio signal recorded on the recording medium.
[0010]
Further, when it is detected that the voice recording and reproducing device is in a state of being
rotated by a predetermined angle as a detection result of the device direction detecting means,
the voice recording and reproducing device is not rotated by the predetermined angle. A stereo
audio signal is created using a microphone element different from the microphone element used
when it is detected as being in the state, and recorded on the recording medium.
[0011]
Further, when it is detected that the voice recording and reproducing device is in a state of being
rotated by a predetermined angle as a detection result of the device direction detecting means,
the voice recording and reproducing device is not rotated by the predetermined angle. A
directional stereo audio signal is created using a set of microphone elements different from the
set of microphone elements used when it is detected as being in the state, and recorded on the
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recording medium.
[0012]
In order to achieve the above object, according to an audio recording and reproducing method of
an audio recording and reproducing apparatus for processing an audio signal input from a
plurality of omnidirectional microphone elements and recording the same on a recording
medium and reproducing the audio signal. A method of detecting a direction of use of the voice
recording and reproducing device, and selecting a microphone element to be used among the
plurality of microphone elements according to the detection result of the device direction
detection step. And are sequentially executed.
[0013]
In the apparatus direction detecting step, it is detected whether or not the voice recording and
reproducing apparatus is in a state of being rotated at a predetermined angle.
[0014]
In addition, when it is detected that the voice recording and reproducing device is in a state of
being rotated at a predetermined angle as a detection result of the device direction detecting
step, only eight microphone elements of the plurality of microphone elements are used. And
recording the monaural audio signal obtained as described above on the recording medium.
[0015]
In addition, when it is detected that the voice recording and reproducing device is in a state of
being rotated at a predetermined angle as a detection result of the device direction detecting
step, only eight microphone elements of the plurality of microphone elements are used. And
recording the monaural audio signal obtained in the above-described manner and the detection
result of the device direction detection step on the recording medium.
[0016]
In addition, it is determined that the reproduction signal output from the recording medium
includes a step of determining whether the detection result of the device direction detection step
is included, and a detection result of the device direction detection step. In the case where it has
been performed, a step of performing stereo processing on the monaural sound signal recorded
on the recording medium is performed.
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[0017]
Further, when it is detected that the voice recording and reproducing device is in a state of being
rotated by a predetermined angle as a detection result of the device direction detecting step, the
voice recording and reproducing device is not rotated by the predetermined angle. A stereo audio
signal is created using a microphone element different from the microphone element used when
it is detected as being in the state, and recorded on the recording medium.
[0018]
Further, when it is detected that the voice recording and reproducing device is in a state of being
rotated by a predetermined angle as a detection result of the device direction detecting step, the
voice recording and reproducing device is not rotated by the predetermined angle. A directional
stereo audio signal is created using a set of microphone elements different from the set of
microphone elements used when it is detected as being in the state, and recorded on the
recording medium.
[0019]
According to the present invention, even at the time of vertical shooting, it is possible to
eliminate the unbalance of the sound and to reproduce the sound direction accurately.
[0020]
Embodiments of the audio recording and reproducing apparatus and the audio recording and
reproducing method of the present invention will be described with reference to the drawings.
The audio recording and reproducing apparatus of this embodiment is applied to, for example, a
digital video camera.
[0021]
First Embodiment FIG. 1 is a block diagram of a main part of a digital video camera equipped
with an audio recording / reproducing apparatus according to a first embodiment of the present
invention.
[0022]
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In the figure, reference numerals 101 and 102 denote nondirectional microphone elements
incorporated in the video camera, and reference numeral 103 denotes a device direction
detection circuit for detecting the vertical direction of the video camera. ing.
An audio signal input / output circuit 105 includes an audio signal interface unit and a switching
unit that switches the microphone elements 101 and 102 in accordance with the detection result
of the device direction detection circuit 103.
Reference numeral 106 denotes an internal memory, and reference numeral 107 denotes an
arithmetic processing circuit for encoding and decoding an audio signal.
[0023]
Reference numeral 108 denotes a recording circuit, and reference numeral 109 denotes a
recording medium.
The recording circuit 108 is a circuit for recording an audio signal on the recording medium 109.
Reference numeral 110 denotes a reproduction circuit that reproduces an audio signal read from
the recording medium 109, and reference numeral 111 denotes a changeover switch 111 for
performing stereo processing on a monaural audio signal by the pseudo stereo processing circuit
112.
Reference numeral 113 denotes a speaker provided in the video camera, and reference numeral
114 denotes a system controller which controls the entire video camera.
Further, the video camera of the present invention is assumed to be equipped with
communication interfaces such as IEEE 1394 and USB.
[0024]
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Next, the operation will be described.
[0025]
The apparatus direction detection circuit 103 inside the video camera detects in what kind of
photographing situation the photographer is trying to photograph.
Based on the detection result of the apparatus direction detection circuit 103, it is determined
that the photographer is performing vertical shooting (shooting condition rotated 90 degrees
with respect to shooting condition at the time of normal shooting) as shown in FIG. 6B. In this
case, only the audio input signal from the microphone element 101 is taken, and the microphone
element switching unit in the audio signal input / output circuit 105 is operated so as not to take
the audio signal from the microphone element 102.
[0026]
At this time, the audio signal becomes monaural audio, and this audio signal is temporarily stored
in the internal memory 106.
The monaural audio signal stored in the internal memory 106 is encoded by the arithmetic
processing circuit 107 and recorded as a monaural audio signal on the recording medium 109
via the recording circuit 108.
At this time, detection result data (data indicating vertical shooting) of the apparatus direction
detection circuit 103 is simultaneously written to the recording medium 109 simultaneously with
the audio signal.
[0027]
Next, when reproducing the audio signal recorded in monaural sound as described above, the
reproduction circuit 110 detects the monaural audio signal recorded in the recording medium
109 and the detection result data of the device direction detection circuit 103 (vertical shooting
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(Data shown) is temporarily stored in the internal memory 106.
The signal stored in the internal memory 106 is decoded by the arithmetic processing circuit
107.
By the operation of the switch 111, the monaural sound signal is passed to the pseudo stereo
formation circuit 112 to be subjected to stereo processing, and output from the speaker 113 via
the sound signal input / output circuit 105 as stereo sound.
When this video camera is connected to an external device such as a television or PC via
IEEE1394 or USB and played back, the audio signal obtained by performing pseudo stereo
processing on the recorded monaural audio signal is transmitted from the communication
interface. It shall output.
[0028]
On the other hand, if it is determined by the detection result of the apparatus direction detection
circuit 103 that the photographer is performing normal photographing as shown in FIG. 6A, the
microphone element switching unit in the audio signal input / output circuit 105 The audio
signal input / output circuit 105 is given directivity by using audio signals taken from both of the
microphone elements 101 and 102, and recorded as stereo audio.
[0029]
As described above, in the present embodiment, the mode (monaural sound / stereo sound) of
the audio signal to be recorded on the recording medium 109 can be selected according to the
imaging mode (vertical shooting / normal shooting) of the photographer.
That is, at the time of normal shooting, stereo sound with directivity given to the recording
medium 109 is recorded and reproduced, and at the time of vertical shooting, monaural sound is
recorded on the recording medium 109 and converted to stereo sound by the pseudo stereo
formation circuit 112. Since the output is performed, even in the case of the vertical shooting, it
is possible to eliminate the unbalance of the voice due to the difference in the shooting
conditions such as the vertical shooting / the normal shooting, and to reproduce the voice
direction accurately.
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[0030]
In the present embodiment, the case where two microphone elements are used is shown, but the
embodiment can be easily implemented even when two or more microphone elements are used.
[0031]
Second Embodiment In the second embodiment, a mode of creating a stereo sound signal by
switching the microphone element to be used according to the photographing condition of the
photographer will be described with reference to FIGS. 2 and 3.
[0032]
FIG. 2 is a block diagram of a main part of a digital video camera equipped with an audio
recording / reproducing apparatus according to a second embodiment of the present invention,
and the same reference numerals are given to the same elements as FIG. Do.
3 (a) and 3 (b) are layout diagrams of microphone elements in the video camera according to the
present embodiment, and FIG. 3 (a) shows a state at the time of normal shooting, and FIG. It
shows the state at the time of shooting.
[0033]
Reference numerals 201a, 202a, 203a, and 204a in FIG. 2 denote nondirectional microphone
elements incorporated in the video camera according to the present embodiment.
Reference numeral 206 denotes a microphone element switching unit that switches a
microphone element according to the detection result of the apparatus direction detection circuit
103, 206a denotes a first microphone element switching unit, and 206b denotes a second
microphone element switching unit.
The first switching unit 206 a switches the outputs of the microphone elements 201 a and 202 a
according to the detection result of the device direction detection circuit 103, and the second
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switching unit 206 b responds to the detection result of the device direction detection circuit
103. The outputs of the microphone elements 203a and 204a are switched.
Reference numeral 207 denotes an audio signal input / output circuit which is an interface part
of an audio signal, and reference numeral 214 denotes a system controller which controls the
entire video camera.
[0034]
Each of the microphone elements 201a to 204a is built in the video camera body 100, and as
shown in FIG. 3A, the microphone elements 201a and 203a are arranged in the left and right
direction of the lower part of the photographing lens 100a in front of the video camera body
100. The microphone elements 202a and 204a are disposed vertically in the lower part of the
photographing lens 100a.
[0035]
Next, the operation of this embodiment will be described.
[0036]
If it is determined by the detection result of the apparatus direction detection circuit 103 that the
photographer is performing the normal shooting shown in FIG. 3A, the microphone element
switching unit 206 is activated to output an audio signal from the right channel to the
microphone element 201a. , And control to input the microphone element 203a as an audio
signal from the left channel.
This input audio signal is temporarily stored in the internal memory 106 via the audio signal
input / output circuit 207.
The stereo audio signal stored in the internal memory 106 is encoded by the arithmetic
processing circuit 107 and recorded in stereo audio on the recording medium 109 via the
recording circuit 108.
[0037]
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On the other hand, if it is determined from the detection result of the apparatus direction
detection circuit 205 that the photographer is performing the vertical shooting shown in FIG. 3B,
the microphone element switching unit 206 is activated and an audio signal from the
microphone element 204a Is controlled to be input as an audio signal from the right channel and
an audio signal from the microphone element 202a as an audio signal from the left channel.
This input audio signal is temporarily stored in the internal memory 106 via the audio signal
input / output circuit 207.
The stereo audio signal stored in the internal memory 106 is encoded by the arithmetic
processing circuit 107 and recorded in stereo audio on the recording medium 109 via the
recording circuit 108.
[0038]
Further, when reproducing an audio signal recorded in the recording medium 109, the audio
signal is recorded as a stereo audio signal in the recording medium 109, and therefore, the audio
signal is output from the speaker 113 via the audio signal input / output circuit 207.
[0039]
As described above, in the second embodiment, it is possible to create a stereo sound signal by
switching the microphone element to be used according to the photographing condition of the
photographer (longitudinal photographing / normal photographing).
As a result, even at the time of vertical shooting, it is possible to eliminate the imbalance of voice
due to the difference in shooting conditions such as vertical shooting / normal shooting, and to
reproduce the voice direction accurately.
[0040]
Third Embodiment In the third embodiment, FIG. 4 and FIG. 5 are referred to for a mode in which
a set of microphone elements to be used is switched according to the photographing condition of
the photographer to create an audio signal with enhanced directivity. While explaining.
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[0041]
FIG. 4 is a block diagram of a main part of a digital video camera equipped with an audio
recording / reproducing apparatus according to a third embodiment of the present invention,
and the same reference numerals are given to the same elements as FIG. Do.
5 (a) and 5 (b) are layout diagrams of microphone elements in the video camera according to the
present embodiment, and FIG. 5 (a) shows a state at the time of normal shooting, and FIG. It
shows the state at the time of shooting.
[0042]
Reference numerals 1a, 2a, 3a and 4a in FIG. 4 denote nondirectional microphone elements
incorporated in the video camera 100 of the present embodiment.
As shown in FIG. 5A, the microphone elements 1a and 2a are disposed on the upper left side (L)
front and the right side (R) rear of the video camera 100, respectively. Also, the microphone
elements 3a and 4a are respectively disposed on the lower right of the lower portion of the video
camera 100 and on the left and rear.
[0043]
401 is a first directivity generation circuit, and 402 is a second directivity generation circuit.
Reference numeral 206 denotes a microphone element switching unit, and in the present
embodiment, the first and second switching units 206a and 206b switch the outputs of the
microphone elements 2a and 4a according to the detection result of the device direction
detection circuit 103. It has become.
[0044]
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The first directivity generation circuit 401 receives the output of the microphone element 1a and
the output of the first switching unit 206a, and the second directivity generation circuit 402
outputs the output of the microphone element 3a and the second switching The output of the
unit 206b is input. Then, the outputs of the first and second directivity creation circuits 401 and
402 are input to an audio signal input / output circuit 405 which is an audio signal interface
part.
[0045]
Next, the operation of this embodiment will be described.
[0046]
If it is determined by the detection result of the apparatus direction detection circuit 103 that the
photographer is performing normal shooting, the first switching unit 206a in the microphone
element switching unit 206 is, as shown in FIG. 5A. The output signals of the microphone
elements 1a and 2a are processed by a first directivity generation circuit 401 to form a first
unidirectional microphone.
Similarly, the second switching unit 206b processes the output signals of the microphone
elements 3a and 4a by the second directivity generation circuit 402 to form a second
unidirectional microphone.
[0047]
The stereo audio signals processed by the first and second directivity generation circuits 401 and
402 are temporarily stored in the internal memory 106 via the audio signal input / output circuit
405. The audio signal stored in the internal memory 106 is encoded in the arithmetic processing
circuit 107 and recorded in stereo audio on the recording medium 109 via the recording circuit
108. When the audio signal recorded on the recording medium 109 is reproduced, the
stereophonic sound recorded on the recording medium 109 is read out by the reproduction
circuit 110 and temporarily stored in the internal memory 106. The signal stored in the internal
memory 106 is decoded by the arithmetic processing circuit 107 and output from the speaker
113 via the audio signal input / output circuit 405.
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[0048]
Next, the operation of this embodiment will be described.
[0049]
If it is determined by the detection result of the apparatus direction detection circuit 103 that the
photographer is performing vertical shooting, the first switching unit 206a in the microphone
element switching unit 206 is, as shown in FIG. 5B. The output signals of the microphone
elements 1a and 4a are processed by a first directivity generation circuit 401 to form a first
unidirectional microphone.
Similarly, the second switching unit 206b processes the output signals of the microphone
elements 3a and 2a in the second directivity generation circuit 402 to form a second
unidirectional microphone.
[0050]
The stereo audio signals processed by the first and second directivity generation circuits 401 and
402 are temporarily stored in the internal memory 106 through the audio signal input / output
circuit 405 and reproduced in the same manner as described above.
[0051]
As described above, in the present embodiment, the set of microphone elements to be used can
be switched according to the photographing condition of the photographer to create an audio
signal with enhanced directivity.
As a result, even at the time of vertical shooting, it is possible to eliminate the imbalance of voice
due to the difference in shooting conditions such as vertical shooting / normal shooting, and to
reproduce the voice direction accurately.
[0052]
In the present embodiment, an example in which four microphone elements are used is shown,
but the embodiment can be easily implemented even in the case of three microphone elements or
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in the case of four or more microphone elements.
[0053]
FIG. 1 is a main part configuration diagram of a digital video camera equipped with an audio
recording and reproducing device according to a first embodiment of the present invention.
It is a principal part block diagram of the digital video camera carrying the audio recording and
reproducing apparatus concerning a 2nd embodiment of the present invention. FIG. 7 is a layout
view of microphone elements in a video camera according to a second embodiment. It is a
principal part block diagram of the digital video camera carrying the audio recording and
reproducing apparatus concerning a 3rd embodiment of the present invention. FIG. 10 is a layout
view of microphone elements in a video camera according to a third embodiment. It is a figure
which shows normal imaging | photography and vertical radiographing in a video camera.
Explanation of sign
[0054]
1a to 4a, 101, 102, 201a to 204a Microphone element 103 Device direction detection circuit
105, 207, 405 Audio signal input / output circuit 106 Memory 107 Arithmetic processing circuit
108 Recording circuit 109 Recording medium 110 Reproduction circuit 112 Pseudo-stereo
processing circuit 113 Speaker 114, 214, 412 system controller 206 microphone element
switching unit 401 first directivity generation circuit 402 second directivity generation circuit
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