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JP2006067355

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DESCRIPTION JP2006067355
A conventional recording apparatus is equipped with a stereo feeling emphasizing circuit at the
time of stereo recording, to give a sense of reality, but if there is a noise source in the vicinity of
the microphone, there is a possibility of enhancing noise. There are major limitations in the
positional relationship with the noise source. According to the present invention, a stereo sense
emphasizing is performed by capturing audio from microphones 31 and 32 which normally have
two directivity, with respect to surrounding audio at the time of shooting, and emphasizing the
sense of presence by stereo audio processing circuit 37. When the processed voice data is
generated and recorded, and a noise sound is generated from the noise sound source during the
recording, one microphone away from the noise sound source from the stereo feeling
emphasizing process before the noise sound is generated This is a recording device that can
switch to the noise reduction processing using 31 and continue recording, and the noise sound
disappears, and by returning to the stereo feeling emphasizing processing, the restriction of the
microphone arrangement at the time of emphasizing the stereo feeling can be reduced. .
[Selected figure] Figure 1
Recording device
[0001]
The present invention relates to a recording apparatus mounted in a camera integrated type VTR,
a recording apparatus for an electronic camera, a recording apparatus incorporating a hard disk,
etc., and performs stereo recording while reducing noise noise generated by a motor etc. during
recording operation. It relates to a recording device.
[0002]
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1
Generally, in a housing of an imaging device such as a video camera, a recording device for
recording surrounding sound (sound) together with a captured image is mounted.
This recording apparatus uses monaural recording with a simple configuration with one
microphone, and stereo recording using two directional microphones to give a sense of reality
around the time of shooting. The sound collection unit consisting of these microphones and the
like has a configuration in which it is attached so as to project to the outside of the device casing,
but the built-in configuration in the device casing is It has become mainstream.
[0003]
Usually, a portable imaging device for capturing a moving image has a large amount of data of
captured image data, and therefore, a method for sequentially recording on a recording medium
is used along with the photographing, and a motor for driving the recording medium is used. The
drive mechanism including is integrally mounted in the device. Therefore, the motor and the
drive mechanism are driven during shooting, and the generated noise enters the voice to be
recorded, which is a factor causing difficulty in listening and lowering the voice quality.
[0004]
Therefore, for example, in Patent Document 1, noises caused by a mechanical system in a sound
pickup device for video camera are subjected to correlation coefficient calculation using a noise
reference microphone built in a small video camera housing, There has been proposed a video
camera sound pickup apparatus which reduces the adverse effect of internal noise.
[0005]
In addition, since a general stereo sound collection device has a configuration in which two
directional microphones are installed at a certain angle to create a sense of stereo by the sound
collection direction, it is difficult to realize a small stereo microphone unit.
Therefore, for example, Patent Document 2 proposes a configuration in which a stereo feeling is
given by combining a box-like cabinet structure, a delay circuit and an attenuator in a built-in
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2
stereo microphone. Patent No. 2839815 gazette Patent No. 2946638 gazette
[0006]
In the imaging apparatus as described above, when performing stereo recording, since the stereo
feeling emphasizing circuit is mounted, noise may be enhanced if there is a noise source near the
microphone.
[0007]
In particular, if the placement positions of the "left and right microphones" and the "noise source"
are not symmetrical, that is, the noise source is not located at the same distance from the left and
right microphones, the stereo feeling emphasizing circuit The problem of emphasizing occurs.
In order to prevent this, it is necessary to dispose the microphones on the left and right and the
noise sources, or to perform processing to reduce the noise sources before performing the stereo
feeling emphasizing processing. Mounting a circuit leads to an increase in circuit scale.
[0008]
The block configuration of the recording processing circuit according to the prior art will be
described by way of example using FIG. The noise reference signal N-in input from the input
terminal 201 is a signal obtained from the sound collection means for collecting the sound
placed close to the noise source. This signal is extracted by the filter 202 only for a signal of a
frequency band to be reduced in noise. The outputs of the filter 202 are adjusted to the gains
suitable for the left and right audio signals 207 and 208 by the amplifiers 203 and 304,
respectively, and delayed by the delay units 205 and 206 for the time suitable for the left and
right audio signals 207 and 208. Outputs from these delay units 205 and 206 are reduced from
the audio signals 207 and 208 by using adders / subtractors 209 and 220 to reduce desired
noise.
[0009]
The noise sound is reduced in the outputs of the adders / subtractors 209 and 210, and the
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difference between the noise sounds is not extracted when the adder / subtractor 211 calculates
the difference between the left and right signals. The output of the adder / subtractor 211 is
taken out as a desired frequency band in the part of the filter 212 and emphasized in the
amplifier 213. The outputs of the amplifier 213 emphasize the stereo feeling of the left and right
signals by the adders / subtractors 214 and 215. As described above, in order to enhance the
sense of stereo, processing for enhancing the noise component is required at the front stage, and
the circuit scale is increased.
[0010]
In addition, to move the "noise source" away from the "left and right microphones" and to make
the position symmetrical is greatly restricted by the recent reduction in size and weight and
design of imaging devices.
[0011]
Therefore, in order to remove noise noise accurately, a dedicated microphone for detecting noise
noise may be arranged.
However, arranging new microphones separately from the left and right microphones is contrary
to the demand for smaller and lighter image pickup apparatuses, and increases manufacturing
costs, which is not realistic.
[0012]
Therefore, an object of the present invention is to provide a recording apparatus capable of
realizing appropriate stereo feeling emphasizing processing while reducing the restriction of the
microphone arrangement with respect to the noise sound source and achieving miniaturization
by sharing processing circuits.
[0013]
In order to achieve the above object, according to the present invention, a driven unit serving as
a noise source at the time of sound recording operation, two sound collecting units arranged to
generate stereo sound, and the driven unit are driven. A first sound collecting unit arranged in
proximity to the driven unit for collecting sound when performing a recording operation, and a
second sound collecting unit arranged at a position farther from the noise sound source than the
first sound collecting unit Noise processing means for performing noise reduction processing on
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a second audio signal using the signal of the noise sound component obtained from the first
sound collection means on the audio signal output from the second sound collection means;
When performing a recording operation without driving the unit, the stereo feeling of the audio
signal obtained by the first sound collecting means using the noise processing means and the
audio signal obtained by the second sound collecting means And means for emphasizing.
[0014]
During normal recording, the recording apparatus according to this configuration takes in sound
from two sound collection means, generates and records sound data subjected to stereo feeling
emphasizing processing in which the realism is emphasized, and records noise during the
recording. If noise noise is generated from the sound source, switch to the noise reduction
processing using one sound collection means away from the noise source from the stereo feeling
enhancement processing before generation and continue recording, and the noise sound is As it
disappears, it returns to the stereo feeling emphasizing processing, and the restriction of the
microphone arrangement at the time of stereo feeling emphasizing is alleviated.
[0015]
According to the present invention, "constraint reduction of microphone arrangement at the time
of emphasizing sense of stereo" becomes possible, and restriction of microphone arrangement is
reduced and downsizing can be achieved by the reduction of the necessity of "moving the
microphone away from noise source".
Further, since it is not necessary to arrange a dedicated microphone for detecting noise, this
contributes to the downsizing of the imaging apparatus.
[0016]
Furthermore, in the present invention, the noise reduction processing circuit which has been
conventionally required can be realized by sharing the filter block (circuit, DSP, etc.) at the time
of stereo sense enhancement processing and the filter block (circuit, DSP, etc.) at the noise
reduction processing. It can be omitted, and the scale of the circuit configuration can be reduced.
[0017]
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5
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings.
FIG. 1 shows a block configuration of an electronic camera equipped with a stereo recordable
recording apparatus according to a first embodiment of the present invention.
[0018]
This electronic camera is roughly divided into an image pickup unit 1 for photographing, a nonvolatile memory 2 in which a predetermined control program and the like are recorded, and a
storage for storing image data and sound (sound) data in a recording medium 3 etc. Device 4,
compression / decompression circuit 5 for compressing or decompressing image data, display
control circuit 7 for displaying a photographed image or an image of recording medium 3 on
display unit 6 such as a liquid crystal display, and image data The output state of the power
supply unit 10 is monitored by monitoring the output state of the power supply unit 10 with the
SDRAM 8 storing data subjected to A / D conversion as format and the camera battery 9 loaded
and supplying power to each component The operation monitor 12 which has a plurality of
operation switches such as a release switch and a power switch and instructs various mode
settings and release, and a surrounding sound A voice input unit 13 for sound, and a sound
output unit 14 that emits recorded voice and voice instruction or the like, are connected via a bus
15 and controls the entire configuration portion for example, a system controller 16 consisting
of an ASIC.
Specifically, the imaging unit 1 generates an image signal (each color component signal) by
photoelectric conversion by receiving an imaging lens system 21 for imaging an object image,
and the imaged object image. , An imaging circuit 23 that generates image data from the image
signal that is controlled and output, and A / D converts the generated image data into digital
data. It comprises a D conversion circuit 24 and a lens drive circuit 25 having a moving
mechanism including a motor 26 and performing lens movement in connection with zooming
and focus control in the imaging lens system 21.
[0019]
The non-volatile memory 2 is preferably a semiconductor memory such as a flash memory, and
stores program data necessary for various processes executed by the system controller 16.
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The recording medium 3 may be a tape medium made of a magnetic tape of a predetermined
width, a disc medium made of a magneto-optical disc, a magnetic disc or the like, or a
semiconductor memory having a stick shape or card shape on which data rewritable
semiconductor memory is mounted. A medium is assumed.
[0020]
The storage device 4 is driven by a motor, and includes a recording head (or recording /
reproducing head) for storing image data and audio data in the recording medium 3 and a
driving mechanism thereof.
[0021]
The compression / decompression circuit 5 compresses the image data and the like read from
the SDRAM 8 and transfers the compressed data to the storage device 4.
Further, the data read from the storage device 4 is decompressed by being subjected to
decompression processing.
[0022]
The power supply unit 10 has a configuration to which a battery or a dedicated or general
purpose battery is transferred. By providing the power supply monitor 11, it is possible to
indicate the remaining amount of battery and the replacement time. Of course, the power supply
unit 10 also has a function of supplying power by a power cable from an outlet provided in a
general house or automobile.
[0023]
The voice input unit 13 has a two-system stereo voice input function by two microphones. That
is, the audio input unit 13 includes two microphones 31 and 32 serving as sound collecting
means, microphone amplifiers 33 and 34 and A / D conversion circuits 35 and 36 respectively
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provided, and two digitized audio signals. And a voice input control circuit 38 for controlling the
processing method and the like in the stereo voice processing circuit 37 based on an instruction
of the system controller 16.
[0024]
In the audio input unit 13 configured as above, the stereo audio signal generated by the
microphones 31 and 32 collecting sound is amplified by the microphone amplifiers 33 and 34.
Further, it is digitized by the A / D conversion circuits 35 and 36 and input to the stereo sound
processing circuit 37. The stereo audio processing circuit 37 changes characteristics and
function settings according to an instruction of the system controller 16, and transmits stereo
audio data to the audio input control circuit 38 while changing the processing method as
appropriate. The audio processing circuit 37 is configured by a gain adjustment circuit, a filter
circuit, a delay circuit, a signal selection circuit, and the like as described later. The system
controller 16 temporarily stores the audio data in the SDRAM 8 and sequentially transfers and
stores the audio data to the storage device 4 in synchronization with the image data.
[0025]
Further, the audio output unit 14 includes an audio output control unit 41 for receiving audio
data temporarily stored in the SDRAM 8 at the time of shooting according to an instruction from
the system controller 16 or audio data from a storage device, and D / A for converting audio data
into analog. It comprises an A conversion circuit 42, a speaker amplifier 43 for amplifying an
analogized audio signal, and a speaker 44 for reproducing an audio signal as audio.
[0026]
The system controller 16 controls the voice input unit 13, the voice output unit 14, the display
control circuit 7, the motor drive circuit 25, and the imaging circuit 23 in accordance with the
input instruction of the operation unit 12.
The operation unit 12 outputs setting information for the electronic camera to the system
controller 16. The setting information and the like can also be displayed on the display unit 6 by
the system controller 16.
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[0027]
The principle of noise and noise removal in this embodiment will be described with reference to
FIGS. 2 and 3. FIG. 2 shows an arrangement example of two microphones of a lens drive motor
serving as a noise source in an electronic camera or the like and an audio input unit.
[0028]
In this arrangement example, the microphones 31 and 32 disposed on the left and right above
the lens barrel 51 of the photographing lens system 21 in front of the camera main body create
stereo feeling by widening the distance between the left and right microphones.
[0029]
Further, the microphone 32 is disposed closer to the moving mechanism including the motor
disposed in the lens barrel than the microphone 31 and separated by a distance L1.
Further, the microphone 31 is disposed at a distance L 2 farther from the moving mechanism
including the lens drive motor 26 than the microphone 32. In such an arrangement, when the
recording operation is performed at the time of the motor drive accompanying the
photographing operation, the microphone 32 can easily detect the noise generated from the lens
drive motor 26.
[0030]
FIG. 3 shows an audio signal detected by each of the microphones 31 and 32 when the recording
operation is performed while the motor is driven. In FIG. 3, the vertical axis represents the noise
signal value, and the horizontal axis represents time.
[0031]
At this time, since the microphone 32 is closer to the motor, the level Vn1 of the noise sound of
the lens drive motor detected is larger than the level Vn2 of the noise sound detected by the
microphone 31.
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[0032]
Assuming that the noise source shown in FIG. 3 is a point source, the signal detected by the
microphone 32 is S1 (t), and the signal detected by the microphone 31 is S2 (t).
The ratio of the noise level Vn1 of the signal S1 (t) detected by the microphone 32 to the noise
level Vn2 of the signal S2 (t) detected by the microphone 31 can be represented by the square of
the ratio of distances L1 and L2 in FIG. . That is, assuming that the noise source is a point source,
the sound pressure is attenuated by the square of the distance.
[0033]
Therefore, the coefficient Gv of the attenuation value of the sound pressure by the distance of the
noise signal can be obtained by the following equation.
[0034]
To reduce the signal S2 (t), it is possible to invert the phase of the signal S1 (t) to generate and
cancel signals of the same amplitude level.
Therefore, the noise component can be reduced by setting S2 (t) = S2 (t) -S1 (t) × Gv.
[0035]
However, in practice, the signal S2 (t) arrives at the microphone with a time difference .DELTA.t
later than the signal S1 (t), so S2 (t) = S2 (t) -S1 (t-.DELTA.t) .times.Gv. The time difference Δt is
determined by the difference in distance from the noise source of the microphone.
[0036]
As shown in FIG. 3, there is a temporal shift, that is, a time difference Δt, between the noise
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10
sound wave form N2 detected by the microphone 31 and the noise sound wave form N1 detected
by the microphone 32. This time difference Δt can be obtained as Δt = (L2−L1) / vs, assuming
that the sound velocity is vs. The temporal shift of the noise signal determined by the time
difference Δt can be canceled by delaying the signal of the microphone 32. This delay
processing is also necessary when removing noise noise.
[0037]
The concept of sound recording from which the noise sound is removed in the sound recording
apparatus of this embodiment will be described. In the recording in this recording apparatus, the
system controller 16 selects stereo sense enhancement processing or noise reduction processing
based on the timing when the noise sound is generated from the noise source (motor), that is, the
timing when the motor drive circuit 25 drives. That is, the system controller 16 causes the stereo
sound processing circuit 37 to perform stereo feeling emphasizing processing when the lens
drive motor 26 serving as a noise source is not driven.
[0038]
On the other hand, when the lens drive motor 26 is driven, the stereo sound processing circuit
37 is subjected to noise reduction processing. This noise reduction processing uses, for example,
a signal when the system controller 16 operates the zoom button as a switching signal, and uses
the output of the microphone 32 closer to the noise source to use the microphone farther from
the noise source. Perform noise reduction processing on the audio signal from 31. That is, the
audio input is switched from stereo recording by the microphones 31 and 32 to monaural
recording only by the microphone 31.
[0039]
Further, as shown in FIG. 3B, for example, the noise signal N2 from the lens drive motor 26 is
also included in the audio signal of the microphone 31, so a band pass filter (BPF) or a high pass
filter (HPF) described later will be described. ) To eliminate noise noise.
[0040]
FIGS. 4A to 4C show configuration examples of the stereo sound processing circuit 37 mounted
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on the recording device in the present embodiment.
The stereo sound processing circuit 37 for removing noise noise will be specifically described. As
shown in FIG. 4A, the left input terminal 61 receives an audio signal R-in obtained from a sound
collecting means (microphone 32) for collecting a sound placed close to a noise sound source.
Ru. The left input end 61 is connected by signal lines to the left output end 75 through the delay
unit 67, the adder / subtractor 70, and the selector 74 (input end a). An audio signal L-in
obtained from sound collecting means (microphone 31) disposed at a position far from the noise
source is input to the right input end 62. The right input end 62 is connected by signal lines to
the right output end 76 via the delay 68 and the adder / subtractor 73.
[0041]
The signal line connected to the right input end 62 is branched to be connected to the input end
a of the selector 64 whose input end b is set to 0 (silence signal). The signal line connected to the
left input end 61 is branched and connected to one end (−) of the input end of the adder /
subtractor 63, and the output end of the selector 64 is connected to the other end (+). The output
end of the selector 64 is connected to a band pass filter (BPF) 65. The output end of the BPF 65
is connected to the gain adjustment unit 66. Note that the BPF 65 can change the frequency
band to be passed at the time of the stereo feeling emphasizing process and the noise reduction
process. Similarly, the gain adjustment unit 66 also changes the gain setting at the time of stereo
sense enhancement processing and noise reduction processing.
[0042]
The output end of the gain adjustment unit 66 is connected to the input end a of the selector 69,
the delay device 71, and the input end a of the selector 72. The selector 69 has the other input
end b set to 0 (a silence signal) and the output end connected to the adder-subtractor 70
provided on the left signal line. The output end of the delay unit 71 is connected to the other
input end b of the selector 72, and the output end is connected to an adder / subtractor 73
provided on the right signal line. Further, the right signal line connected to the output end of the
adder / subtractor 73 is branched and connected to the input end b of the selector 74 provided
on the left signal line. The signal line indicated by the broken line is a line used for monaural
output.
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[0043]
In such a configuration, the connection relationship at the time of stereo sense emphasis
processing will be described with reference to FIG. 4 (b). FIG. 4B shows the components to be
driven at the time of stereo sense enhancement processing among the components in FIG. 4A
described above, and the components not to be driven are deleted for convenience.
[0044]
The selector 64 selects the audio signal R at the time of stereo sense emphasizing processing.
The adder / subtractor 63 outputs the difference between the signal from the selector 64 and the
audio signal L-in to the BPF 65. The BPF 65 passes only a predetermined frequency band set for
stereo sense enhancement processing.
[0045]
The output of the BPF 65 is input to the gain adjustment unit 66, and is adjusted by the gain
setting value set for stereo feeling enhancement processing.
[0046]
The delay units 67 and 68 provided for each signal line absorb the delay generated by the band
pass filter 65.
The selector 69 selects the output signal of the gain adjustment 66. The adder / subtractor 70
subtracts the output signal of the selector 69 from the output of the delay unit 67. The selector
72 selects the output of the gain adjustment unit 66. The selector 74 selects the output of the
adder / subtractor 70. Further, the adder-subtractor 73 adds the output of the delay unit 68 and
the output of the selector 72.
[0047]
When stereo sense enhancement processing is performed, processing based on the following
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equation (1) is performed on the audio signal L on the right side and the audio signal R on the
left side. Then, the processed stereo audio signals L-out and R-out are output to the audio input
control circuit 38. Formula (1) is L-out = L-in + BPF (L-R) * gain R-out = R-in + BPF (R-L) * gain
(1). When only the difference between the audio signals of the two microphones 31 and 32 is
used for emphasizing the stereo feeling, as the distance between the microphones decreases, the
emphasizing effect due to the delay of the left and right signals diminishes. The selector 69
selects the silence signal at the input end b. The adder / subtractor 70 subtracts the output signal
of the selector 69 from the output of the delay unit 67.
[0048]
The delay unit 71 delays the output of the gain adjustment unit 66 to absorb the phase
difference of the noise source. The selector 72 selects the output of the delay unit 71. The adder
/ subtractor 73 adds the output of the delay unit 68 and the output of the selector 72. The
selector 74 selects the output of the adder / subtractor 73 at the time of noise reduction
processing.
[0049]
When the noise reduction processing is performed, processing based on equation (2) is
performed on the right audio signal L-in and the left audio signal R-in. Then, L-out and R-out are
output to the audio input control circuit 38 as stereo audio signals. Formula (2) is L-out = R-in +
BPF (-L) * gain R-out = R-in + BPF (-L) * gain (2). Mechanical noise such as a motor is likely to be
superimposed on the high range, and a peak may appear at about 2 KHz to 3 KHz. In recent
video cameras and the like, the sampling frequency at the time of sound collection becomes less
pronounced as it can cover the entire audible range. The sound pressure decreases in inverse
proportion to the square of the distance. However, on the contrary, if the difference between the
audio signals of the two microphones is overemphasized for miniaturization, stereo sense
emphasis may cause wind noise (random noise) to be emphasized. In such a situation, it is
necessary to remove wind noise (for example, about 200 Hz) by using a high pass filter (HPF)
instead of the band pass filter (BPF).
[0050]
Next, referring to FIG. 4C, the connection relationship at the time of noise reduction processing
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will be described. FIG. 4C shows the components to be driven during the noise reduction process
among the components in FIG. 4A described above, and the components not to be driven are
omitted for convenience.
[0051]
At the time of noise reduction processing, the selector 64 selects the silence signal (01) at the
input terminal b and outputs it to the adder / subtractor 63. The adder / subtractor 63 outputs
the difference between the signal from the selector 64 and the audio signal L-in to the band pass
filter (BPF) 65. The BPF 65 passes only a predetermined frequency band set for noise reduction
processing, and outputs the signal to the gain adjustment unit 66. The gain adjustment unit 66 is
adjusted by a gain setting value set for noise reduction processing. The delay devices 67 and 68
provided in each signal line are provided to absorb the delay of the signal generated in the BPF
65 and the gain adjustment unit 66. In recent years, a high sampling frequency of about 48 KHz
has come to be used. Therefore, noise sound may be recorded in the high range, and it is
necessary to set the BPF so that only this noise sound can be extracted and removed easily.
[0052]
Next, moving image recording and recording in the electronic camera according to the present
embodiment will be described with reference to the flowchart shown in FIG. First, it waits in the
low consumption operation state until it detects that the power switch (not shown) is turned on
by the input signal of the operation unit (step S1). The power switch is turned on (YES), power
supply is started, and the remaining amount of the camera battery is detected to determine
whether it is equal to or more than a prescribed threshold (step S2). If it is determined that the
remaining amount of the camera battery is equal to or more than the prescribed threshold (YES),
the initialization process is executed (step S3). On the other hand, if the remaining amount of the
camera battery is equal to or less than the threshold (NO), a warning display (step S4) indicating
that there is no remaining battery amount is performed. It returns to step S1.
[0053]
In the initialization process of step S3, the lens setup process in the photographing lens system,
the initialization of the imaging circuit 23, the initialization of the sound input unit 13, the
mounting process of the storage device 4 and the like are performed. When the stereo sound
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processing circuit 37 is not particularly set, it is usually set to the stereo feeling emphasizing
process.
[0054]
Further, the display unit 6 displays an image currently captured by the imaging circuit 23. Next,
it is determined whether the release switch has been operated (step S5). If the release switch is
not operated in this determination (NO), it is determined whether the power is turned off (step
S6). Here, if the power is not turned off (NO), the process returns to step S5 to wait for the
release switch to be operated. On the other hand, if the power is turned off (YES), the process
returns to step S1.
[0055]
In step S5, if the release switch is operated (YES), shooting processing of a moving image
including voice recording is performed (step S7). That is, the moving image is recorded, and the
surrounding sound that has been subjected to stereo sense enhancement processing is recorded.
Thereafter, it is determined whether an instruction to end shooting has been issued (step S8). In
this determination, an instruction to end the shooting is issued based on, for example, the release
switch being turned off or the remaining amount of recording in the storage device 4; The
process returns to step S5 and stands by until the next shooting is performed.
[0056]
On the other hand, if the photographing is not finished (NO), it is judged whether or not the zoom
operation is instructed by the operation switch (step S10). Here, if there is a request for zoom
operation (YES), the audio input control circuit 38 performs noise reduction processing under the
optimum setting condition by the audio input control circuit 38 based on an instruction from the
system controller 16 prior to zoom drive. It is switched and recording is continued (step S11).
The optimal setting condition is that the setting may change for each feature of the
photographing lens system. The same applies to the other drive. Thereafter, a zoom operation is
performed in the photographing lens system 21 (step S12). Then, after the zoom operation is
finished, the stereo sound processing circuit 37 is switched to the stereo feeling emphasizing
process (step S13).
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[0057]
After setting to the stereo feeling emphasizing process, or when there is no zoom operation
request in step S10 (NO), it is determined whether the system controller 16 is requested to
perform focus drive (step S14). In this determination, if there is a request for focus drive (YES),
noise reduction of the stereo audio processing circuit 37 under the optimum setting conditions is
performed by the audio input control circuit 38 based on an instruction from the system
controller 16 prior to focus drive. The processing is switched to (step S15). Thereafter, the
focusing operation in the photographing lens system 21 is performed (step S16). After the
focusing operation is completed, the stereo sound processing circuit 37 is switched to the stereo
feeling emphasizing process (step S17).
[0058]
Next, white balance (WB) processing is performed on the captured video signal (moving image)
(step S18), and moving image data is written to the storage device 4 for each predetermined
image frame, and audio data is similarly moved The data is written to the storage device 4 while
being synchronized with the data (step S19). Returning to step S8, such photographing and
recording (recording) are repeated. If it is determined in step S8 that the photographing end
request is received, the photographing end processing is performed as described above, and the
moving image file closing processing to the storage device 4 and the remaining capacity
calculation of the storage capacity of the storage device 4 are performed.
[0059]
As described above, according to the first embodiment, with regard to the surrounding sound at
the time of shooting, the sound is taken in from the microphone having the two directivity in
general, and the stereo feeling emphasizing process in which the sense of reality is emphasized is
performed. If the generated voice data is generated and recorded, and a noise sound is generated
from the noise sound source during shooting, use one microphone away from the noise sound
source from the stereo feeling emphasizing process before the noise sound is generated By
switching to the above-described noise reduction processing and continuing the recording, the
noise sound disappears, and by returning to the stereo feeling emphasizing processing, the
restriction of the microphone arrangement at the time of emphasizing the stereo feeling can be
reduced.
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[0060]
Furthermore, even if the two microphones are not placed apart from the noise source, the
arrangement of the one microphone away from the noise source reduces the restriction on the
microphone placement and enables further miniaturization.
In addition, a dedicated microphone for detecting noise noise is not required, which contributes
to simplification and downsizing of the imaging apparatus and cost reduction.
[0061]
Furthermore, in the present embodiment, the filter block (circuit, DSP, etc.) at the time of stereo
sense enhancement processing and the filter block at the time of noise reduction processing are
made common, so the noise reduction processing circuit conventionally required can be omitted.
Can be reduced in size.
[0062]
A second embodiment according to the present invention will be described.
FIG. 6 shows a block configuration of a recording apparatus with built-in hard disk capable of
stereo recording according to a second embodiment of the present invention.
[0063]
This recording apparatus includes a non-volatile memory 81 in which a predetermined control
program and the like are recorded, a storage device 82 for storing audio (sound) data in a hard
disk built therein, an operation guide on a display unit 83 such as a liquid crystal display A
display control circuit 84 for displaying an operation state, a power supply unit 86 for supplying
power to each component by loading a battery 85, and a power supply monitor for monitoring
the output state of the power supply unit 86 and detecting the remaining amount of the battery
85 87, an operation unit 88 having a plurality of operation switches such as a recording switch
and a power switch and instructing various mode settings and release, a voice input unit 89 for
recording surrounding voice, recorded voice and voice instructions, etc. And a system controller
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91 configured of, for example, an ASIC, which controls the entire component. Specifically, the
non-volatile memory 81 is, for example, a flash memory or the like, and stores program data
necessary for various processes executed by the system controller 91. The storage device 82 is
driven by a motor, and has a recording head (or recording / reproducing head) for storing audio
data in a built-in hard disk and its driving mechanism. The power supply unit 86 has a
configuration to which a battery or a dedicated or general purpose battery is transferred. By
providing the power supply monitor 87, it is possible to indicate the remaining amount of battery
and the replacement time. Of course, the power supply unit 86 also has a function of supplying
power by a power cable from an outlet provided in a general house or automobile.
[0064]
The voice input unit 89 has a two-system stereo voice input function by two microphones. That
is, the audio input unit 89 includes two microphones 92 and 93 as sound collecting means,
microphone amplifiers 94 and 95 and A / D conversion circuits 96 and 97 provided for each, and
two digitized audio signals. And a voice input control circuit 99 for controlling the processing
method and the like in the stereo voice processing circuit 98 based on an instruction of the
system controller 91.
[0065]
In the audio input unit 89 configured as described above, stereo audio signals generated by the
microphones 92 and 93 collecting sound are amplified by the microphone amplifiers 94 and 95.
Further, they are digitized by the A / D conversion circuits 96 and 97 and input to the stereo
sound processing circuit 98. The stereo audio processing circuit 98 changes the characteristics
and function settings according to the command of the system controller 91, and transmits
stereo audio data to the audio input control circuit 99 while changing the processing method as
appropriate. The audio processing circuit 98 is equivalently configured by a gain adjustment
circuit, a filter circuit, a delay circuit, a signal selection circuit, and the like equivalent to those
described in FIG. The description here is omitted.
[0066]
In addition, the audio output unit 90 includes an audio output control unit 100 for receiving
audio data collected by an instruction of the system controller 91 or audio data read from a
storage device, and D / A for converting audio data into an analog signal. It comprises a
conversion circuit 101, a speaker amplifier 102 for amplifying an analog audio signal, and a
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speaker 103 for reproducing an audio signal as audio.
[0067]
The system controller 91 controls the voice input unit 89, the voice output unit 90, and the
display control circuit 84 in accordance with the input instruction of the operation unit 88.
The operation unit 88 outputs setting information by the user to the system controller 91.
[0068]
Recording in the hard disk built-in recording apparatus of the present embodiment will be
described with reference to the flowchart shown in FIG.
[0069]
First, the off state is maintained until the power switch is turned on by the input signal of the
operation unit 88, or the low consumption operation state is on standby until it is detected that
the power switch is turned on (step S21).
The power switch is turned on (YES), the power supply is started, and the remaining amount of
the battery 85 is detected to determine whether it is equal to or more than a prescribed
threshold (step S22). If it is determined that the remaining amount of the battery 85 is equal to
or more than the prescribed threshold (YES), the initialization process is executed (step S23). In
this initialization processing, initialization of the stereo sound processing circuit 98, mounting
processing of the storage device 82, etc. is performed, and rotational drive of the hard disk in the
storage device 82 is temporarily stopped to reduce power consumption. On the other hand, if it is
determined in step S23 that the remaining amount of the battery 85 is equal to or less than the
threshold (NO), a warning display (step S24) that there is no remaining amount of the battery 85
is performed. While prompting for battery replacement, the process returns to step S21.
Incidentally, the stereo sound processing circuit 98 is usually set to stereo feeling emphasizing
processing when it is not particularly set.
[0070]
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Next, it is determined whether the recording switch has been operated (step S25). If the
recording switch is not operated in this determination (NO), it is determined whether the power
is turned off (step S26). Here, if the power is not turned off (NO), the process returns to step S25,
and waits for the recording switch to be operated. On the other hand, if the power is turned off
(YES), the process returns to step S21. In step S25, if the recording switch is operated (YES), the
surrounding sound subjected to stereo feeling enhancement processing is recorded.
[0071]
Thereafter, it is determined whether the end of the recording has been instructed (step S28). In
this determination, the recording end instruction is issued based on, for example, the recording
switch off or the remaining storage capacity of the hard disk in the storage device 82 described
later, and the end request is detected (YES). The recording end process is performed (step S29),
and the process returns to step S25 and waits until the next recording is performed.
[0072]
On the other hand, if the recording is not completed (NO), it is determined whether a request for
writing the audio data to the hard disk of the storage device 82 is detected (step S30). Writing
voice data to the hard disk during recording may be considered when the capacity of a buffer
such as a RAM for temporarily stocking voice data runs short.
[0073]
If there is a write request for this audio data (YES), the stereo audio processing circuit 98 is
switched to noise reduction processing based on an instruction from the system controller 91
prior to the write operation, and recording is continued ( Step S31). Thereafter, the audio data is
written to the rotationally driven hard disk (step S32). Then, after the writing operation is
completed, the stereo sound processing circuit 98 is switched to the stereo feeling emphasizing
process (step S33).
[0074]
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Then, if it is switched to the stereo feeling emphasizing process at step S33, or if writing is not
performed on the hard disk at step S30 (NO), the remaining amount of recording on the hard
disk is calculated (step S34). Return. If there is a remaining amount of recording in this
calculation, the recording is continued as it is, and the acquired voice data is monitored.
[0075]
As described above, according to this embodiment, during normal recording, voice is taken in
from two microphones having directivity, and voice data subjected to stereo-emphasis
emphasizing processing with enhanced presence is generated and recorded. If the noise sound is
generated from the noise source consisting of the drive system of the hard disk during the
recording, the noise reduction processing using one microphone away from the noise source
from the stereo feeling emphasizing processing before the noise sound is generated By switching
to the above and continuing the recording, the noise sound disappears, and by returning to the
stereo feeling emphasizing process, it is possible to reduce the restriction on the microphone
arrangement at the time of emphasizing the stereo feeling.
[0076]
Furthermore, even if the two microphones are not placed apart from the noise source, the
arrangement of the one microphone away from the noise source reduces the restriction on the
microphone placement and enables further miniaturization.
In addition, a dedicated microphone for detecting noise noise is not required, which contributes
to simplification of the device, downsizing, and cost reduction.
[0077]
Furthermore, in the present embodiment, the filter block (circuit, DSP, etc.) at the time of stereo
sense enhancement processing and the filter block at the time of noise reduction processing are
made common, so the noise reduction processing circuit conventionally required can be omitted.
Can be reduced in size.
[0078]
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FIG. 1 is a block diagram of an electronic camera equipped with a stereo-recordable recording
apparatus according to a first embodiment of the present invention.
It is a figure for demonstrating the positional relationship of the noise sound source and
microphone in 1st Embodiment. It is a figure which shows the audio | voice signal which the
microphone in the arrangement | positioning shown in FIG. 2 detects. It is a figure which shows
the structural example of the stereo sound processing circuit mounted in the recording device in
1st Embodiment. It is a flowchart for demonstrating the moving image recording in the electronic
camera which concerns on 1st Embodiment, and sound recording. It is a figure which shows the
block configuration of the recording apparatus with a built-in hard disk which can be stereorecorded based on 2nd Embodiment. It is a flowchart for demonstrating the sound recording
operation in the sound recording apparatus which concerns on 2nd Embodiment. It is a figure
which shows an example of the block configuration of the recording processing circuit by a prior
art.
Explanation of sign
[0079]
DESCRIPTION OF SYMBOLS 1 ... imaging part, 2 ... non-volatile memory, 3 ... recording medium, 4
... storage device, 5 ... compression / expansion circuit, 6 ... display part, 7 ... display control
circuit, 8 ... SDRAM, 9 ... camera battery, 10 ... Power supply unit 11 Power supply monitor 12
Operation unit 13 Voice input unit 14 Voice output unit 15 Bus 16 System controller 21 Imaging
lens system 22 Imaging device 23 Imaging circuit 24, 35, 36: A / D conversion circuit, 25: lens
drive circuit, 26: motor, 31, 32: microphone, 33, 34: microphone amplifier, 37: stereo sound
processing circuit, 38: sound input control circuit, 41 ... audio output control unit, 42 ... D / A
conversion circuit, 43 ... speaker amplifier, 44 ... speaker.
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