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DESCRIPTION JP2002171482

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DESCRIPTION JP2002171482
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
video camera for recording video and audio, and more particularly to a camera for recording a
narrator of a photographer.
[0002]
2. Description of the Related Art As an example of a technique for recording a narrator of a
photographer clearly, Japanese Patent Laid-Open No. 6-245119 selects one of the left and right
microphones which has a good sound collecting state for the voice emitted by the photographer,
An audio signal recording device is described which derives and records audio signals from those
which are good.
[0003]
However, in the above-mentioned audio signal recording apparatus, once recorded in the
narration recording mode, there is a problem that it is not possible to control the presence or
absence of the narration and the volume thereof at the time of reproduction.
In addition, there is a problem that a narrator unintended by the photographer and a voice of a
person near the photographer are recorded. Furthermore, since the photographer is close to the
sound collection microphone, there is a possibility that the narration may be recorded at a higher
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volume than the sound near the shooting target.
[0004]
In view of such problems, it is an object of the present invention to provide a recording /
reproducing apparatus such as a video camera capable of controlling the volume independently
of the sound of the photographing target even when the narrator of the photographer is
reproduced. Another object of the present invention is to provide a recording / reproducing
apparatus capable of selecting whether to record narration or reproducing.
[0005]
In order to solve the above problems, a recording apparatus according to the present invention
comprises a first signal input unit, a second signal input unit, and a third signal input unit.
Recording the signal input from the first signal input unit in a first recording area of the
recording medium, and recording the signal input from the second signal input unit into a second
recording area of the recording medium 6. A recording apparatus for recording and recording a
signal input from the third signal input means in a third recording area of the recording medium.
[0006]
The video camera according to the present invention further includes Lch and Rch recording
microphones for collecting the left and right voices of the shooting target and a narration
recording microphone for collecting the voice of the photographer, and the Lch recording
microphone The audio obtained from the Rch recording microphone and the narration recording
microphone is encoded independently for each channel to generate an audio stream.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present
invention will be described in detail with reference to the drawings.
[0008]
First, a first embodiment of the present invention will be described.
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FIG. 1 is a view showing a first video camera of the present invention.
As shown in the figure, this video camera is a recording medium 10, a multiplexer 20, a video
encoder 30, an audio encoder 40, a camera 50, and an Lch for converting the left audio of a
shooting target into a digital signal. A recording microphone 60, an Rch recording microphone
70 for collecting the right sound of the shooting target and converting it to a digital signal, and a
narration microphone 80 are provided.
[0009]
An image captured by the camera 50 is converted to a digital signal.
The video encoder 30 encodes the digital signal obtained from the camera 50 to generate a video
stream. The Lch recording microphone 60 collects Lch sound of a shooting target and converts it
into a digital signal. The Rch recording microphone 70 collects Rch audio of a shooting target
and converts it into a digital signal. The narration microphone 80 converts the voice emitted by
the photographer into a digital signal. The audio encoder 40 independently encodes a total of 3
channels of audio obtained from the Lch recording microphone 60, the Rch recording
microphone 70, and the narration microphone 80 for each channel to generate an audio stream.
The multiplexer 20 receives the encoded stream from the video encoder 30 and the audio
encoder 40, and performs audio and video synchronization processing. Then, the generated AV
stream is written to a recording medium 10 such as a magnetic tape, a semiconductor memory,
or an optical disc.
[0010]
According to the present invention, with the above configuration, a clear narration can be
obtained by placing a microphone near the photographer and recording on a separate channel. In
addition, the Lch recording microphone 60 and the Rch recording microphone 70 do not need to
collect voices in the vicinity of the photographer, so the directivity to the shooting target can be
greatly improved, and the voices in the vicinity of the shooting target can be sharpened. It can
record. As described above, the narration can be made distinguishable by recording the narrator
of the photographer on an independent channel.
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[0011]
Next, a second embodiment of the present invention will be described. FIG. 2 is a view showing a
second video camera of the present invention. In the figure, the same parts as those in FIG. The
encoding / decoding changeover switch 140 is connected to the writing side to the recording
medium 10 at the time of encoding, and to the reading side from the recording medium 10 at the
time of decoding to distinguish encoding processing from decoding processing. The
demultiplexer 90 reads the AV stream via the encode / decode switch 140, separates the video
stream and the audio stream, and outputs the audio and video so as to be synchronized. The
video decoder 100 reads the video stream from the demultiplexer 90 and performs a decoding
process to obtain a video signal. The monitor 130 displays the video signal output from the video
decoder 100. The audio decoder 110 reads the audio stream from the demultiplexer 90,
performs decoding processing, and outputs a total of 3 channels of Lch, Rch, and narration audio
signals. The downmix circuit 120 reads the audio signal of 3ch from the audio decoder 110 and
downmixes it to 2ch using a fixed value or a downmix coefficient set by the user. The Lch
recording microphone / reproduction speaker 61 picks up Lch sound of the imaging target at the
time of recording, and outputs Lch sound at the time of reproduction. The Rch recording
microphone / reproduction speaker 71 picks up Rch sound of the imaging target at the time of
recording, and outputs Rch sound at the time of reproduction.
[0012]
In the present embodiment, it is possible to adjust the volume of the voice in the vicinity of the
shooting target and the voice of the narration by performing the downmix process from 3ch to
2ch at the time of reproduction of the AV stream recorded with narration in an independent
channel. Become.
[0013]
The downmix coefficients of the voice in the vicinity of the shooting target and the voice of the
narration may use coefficient values prepared in advance, or may be adjusted at the time of
reproduction by the user.
In addition, since muting the narration voice at the time of reproduction substantially blocks the
voice in the vicinity of the photographer, it is possible to clearly reproduce the voice in the
vicinity of the shooting target even when the photographer's surroundings are noisy. Similarly,
muting the sound in the vicinity of the shooting target at the time of playback enables narration
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to be clearly reproduced even when shooting a noisy scene. As described above, in the second
embodiment, the volume of narration can be controlled by changing the downmix coefficient at
the time of reproduction.
[0014]
Next, a third embodiment of the present invention will be described. FIG. 3 is a diagram showing
a third video camera of the present invention. In the figure, the same parts as those in FIG. The
narration volume adjustment circuit 150 adjusts the volume of the digital signal input from the
narration microphone 80 and then outputs the digital signal to the audio encoder 40. The
volume adjustment circuit 151 adjusts the volume of the digital signal input from the Lch
recording microphone 60 and the Rch recording microphone 70 and outputs the result to the
audio encoder 40.
[0015]
In this embodiment, the volume of the voice of the narration and the volume of the voice in the
vicinity of the shooting target are relatively adjusted and then recorded, thereby reducing the
time for downmixing at the time of reproduction. The volume value to be adjusted may be a value
prepared in advance or a value set by the photographer at the time of recording. Thus, by
adjusting the volume at the time of recording, the volume of narration can be controlled. Also, by
muting voice or narration near the shooting target and not encoding the mute channel by the
audio encoder 40, it is possible to reduce the bit rate of the audio stream and extend the
recording time of the video camera.
[0016]
Next, a fourth embodiment of the present invention will be described. FIG. 4 is a view showing a
fourth video camera of the present invention. In the figure, the same parts as those in FIG. The
downmix circuit 230 downmixes the digital signal obtained from the Lch recording microphone
60 and the digital signal obtained from the Rch recording microphone 70 and outputs a
monaural digital signal. The selector 240 selects one of a digital signal obtained from the Lch
recording microphone 60, a digital signal obtained from the Rch recording microphone 70, a
monaural digital signal obtained from the downmix circuit 230, and a digital signal obtained
from the narration microphone 80. Select one channel and output.
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[0017]
In this embodiment, by selecting two channels by the selector 240 and performing audio
encoding processing, narration can be clearly recorded even by the conventional audio encoder
limited to two channels. By limiting the channels to be encoded to two channels, it is possible to
lower the bit rate of the bit stream to be generated and extend the recording time. As described
above, by limiting to two channels, it is possible to enable the conventional audio encoder to use
the present technology.
[0018]
Next, a fifth embodiment of the present invention will be described. FIG. 5 is a view showing a
fifth video camera of the present invention. In the figure, the same parts as those in FIG. The
zoom controller 160 controls the movement of the zoom lens of the camera 50 based on the
operation of the photographer.
[0019]
In this embodiment, the volume adjustment of the narration volume adjustment circuit 150 and
the volume adjustment circuit 151 is linked with the control signal of the zoom controller 160 to
record the voice intended by the photographer. In other words, when zooming in, the
photographer wants to record around the shooting target far away, sharpens the directivity of
the camera, and plays around the shooting target so that the sound near the shooting target is
played back. Relatively increase the volume of voice. On the contrary, when zooming out, it is
desired to record the sound of the shooting target and the whole area, and by controlling the
volume relative to the narration to be able to shoot the video intended by the photographer .
[0020]
As described above, by linking the narration to the zoom, it is possible to adjust the volume of the
narration in accordance with the photographed image.
[0021]
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Next, a sixth embodiment of the present invention will be described.
FIG. 6 is a view showing a sixth video camera of the present invention. In the figure, the same
parts as those in FIG. The narration adjustment circuit 170 receives the digital signal from the
narration microphone, and outputs the digital signal of the narration to the audio encoder when
there is an input of sound at a certain volume or higher.
[0022]
In the present embodiment, in consideration of recording a narration, the recording is performed
only when the user speaks at a certain volume, and in other cases, the bit rate is reduced by
muting to extend the recording time. . In addition, by blocking sound other than narration near
the photographer at the time of recording, narration can be reproduced more clearly. As
described above, by discriminating and recording only the narration intended by the
photographer, the narration can be clearly recorded.
[0023]
Next, a seventh embodiment of the present invention will be described. FIG. 7 is a view showing a
seventh video camera of the present invention. In the figure, the same parts as those in FIG. The
changeover switch 180 switches the audio signal outputted by the narration microphone 80
according to the selection of the photographer. The voice recognition circuit 190 receives the
digital signal of the voice collected by the narration microphone 80 from the changeover switch
180, recognizes the input voice, and outputs a corresponding control signal. The system
controller 200 controls the operation of each part of the video camera, and when there is a
control signal output from the voice recognition circuit 190, controls the entire system according
to the contents of the control signal.
[0024]
In this embodiment, the photographer can not only record narrations using the narration
microphone 80, but also can control the video camera with the words that are issued. In the
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conventional video camera operation during shooting by button operation, the type of content to
be operated is limited. However, control by voice recognition makes it possible to easily perform
operations such as fade-in at the time of screen switching, effects such as mosaic, and color tone
changes such as color and black and white during shooting. As described above, the voice
recognition circuit has an effect of enabling control of each part of the video camera.
[0025]
Next, an eighth embodiment of the present invention will be described. FIG. 8 is a view showing
an eighth video camera of the present invention. In the figure, the same parts as those in FIG. The
headphone type narration microphone 220 is detachable from the video camera main body, is
mounted on the head of the photographer, and converts the narration emitted by the
photographer into a digital signal. The receiving circuit 210 receives the digital signal of
narration output from the headphone type narration microphone 220 and outputs the digital
signal to the audio encoder.
[0026]
In this embodiment, the narration microphone can be removed from the video camera main
body, and the directivity of the narration microphone can be enhanced by recording the
narration close to the photographer's mouth. In addition, even if the video camera is shot away
from the eyes, the narration microphone is the mouth of the photographer so that clear narration
can be recorded. The photographer can listen to the output of the Lch and Rch recording
microphones during recording from headphones, and can perform narration while checking the
recorded sound. The eighth embodiment has an effect of blocking noise around the photographer
by clearly collecting the narrator of the photographer by using headphones.
[0027]
According to the present invention, by recording the narration by the voice emitted by the
photographer on an independent channel, it is possible to clearly record the voice near the
shooting target and the narration voice.
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