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JP2004343484

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DESCRIPTION JP2004343484
The present invention provides an electronic camera capable of providing a listener with sound
with higher sound quality. According to information on a sound signal from a monitor M, the
following sound signal processing is performed. Since the set volume of the monitor M is (low),
the sound signal is amplified so that the volume becomes medium at this set state. Further, since
the setting sound quality of the monitor M is (low-frequency emphasis), a high-pass filter or the
like is applied to the sound signal so as to have a flat characteristic. Furthermore, when the
stored sound signal is monaural compatible, pseudo stereo processing is applied to it. Also, when
the setting balance of the monitor M is (left 1: right 2), it should match the position of the
listener, so it is not changed, but it is changed to be (left 1: right 1) It is good. [Selected figure]
Figure 3
Electronic camera
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electronic camera, and more particularly to an electronic camera capable of storing a sound
signal together with an image signal. In a video camera, which is a type of electronic camera,
both image signals and sound signals can be stored in a storage medium such as a magnetic tape,
but in recent years, moving images (or still images) have been recorded. Digital still cameras have
also been developed that can record the ambient sound in time with the shooting of the camera.
The image signal and the sound signal stored in the electronic camera in this manner can be
confirmed by reproducing the image signal and the sound signal using a liquid crystal display
and a speaker built in the electronic camera. Patent Document 1 below discloses a digital still
camera that includes a speaker and can reproduce recorded audio while reproducing recorded
moving images on a liquid crystal display. [Patent Document 1] Japanese Patent Application
Publication No. 2001-197414 SUMMARY OF THE INVENTION Incidentally, the electronic
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camera described above generally has an output terminal for outputting an image signal and a
sound signal to the outside. Have. By connecting such an output terminal to an external monitor
via a cable, it is possible to view an image recorded by a larger display and to listen to sound
through a high-performance speaker. Here, while an external monitor has various performances
and characteristics, the sound signal output from the conventional electronic camera is output to
the external monitor without being processed. There is a problem that the sound emitted from
the speaker of the external monitor is not necessarily the best. Furthermore, there is also a
demand for reproducing recorded voices more appropriately in accordance with imaging
conditions. The present invention has been made in view of the problems of the prior art, and it
is an object of the present invention to provide an electronic camera capable of providing a
listener with sound with higher sound quality. According to a first aspect of the present
invention, there is provided an electronic camera comprising: an imaging unit for converting an
optical image into an image signal and acquiring the image signal; a storage unit for storing an
image signal and a sound signal; An interface unit for transmitting an image signal and a sound
signal stored in the storage unit to an external monitor; and information on sound reproduction
from the external monitor via the interface unit, and according to the information on the sound
reproduction For example, the stored sound signal is monaural compatible, but it is revealed that
the external monitor has a stereo compatible speaker based on the information related to the
sound reproduction. In this case, the processing unit performs processing to convert the
monaural sound signal into pseudo stereo, and outputs the processed sound signal to the
external monitor, so that the listener performs the pseudo step. You can listen to the sound of Oh
effect.
Furthermore, before transmitting the image signal and the sound signal stored in the storage unit
to the external monitor, if information regarding sound reproduction is input from the external
monitor via the interface unit preferable. Further, the processing of the sound signal preferably
includes at least one of change of volume, change of sound quality, switching of stereo signal /
monaural signal, and change of balance of stereo signal. According to a second aspect of the
present invention, there is provided an electronic camera comprising: an imaging unit for
converting an optical image into an image signal for acquisition; a storage unit for storing an
image signal and a sound signal; and an image signal stored in the storage unit. An interface unit
for transmitting an audio signal and an audio signal to an external monitor, a selection unit for
selecting processing content of the audio signal to be output to the external monitor, and the
processing content selected by the selection unit. For example, since the stored sound signal is
monaural compatible because it has a sound signal processing unit that processes sound signals,
the listener uses the selection unit when the external monitor has a stereo compatible speaker. If
stereo processing is selected as the processing content, the processing unit performs processing
to make a monaural sound signal pseudo-stereo, and outputs the processed sound signal to the
external monitor to listen to the sound. The buyer can listen to the sound with the pseudo stereo
effect. Further, the processing of the sound signal preferably includes at least one of change of
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volume, change of sound quality, switching of stereo signal / monaural signal, and change of
balance of stereo signal. In this specification, processing of sound signals may be processing such
as bass emphasis, treble emphasis, noise reduction, surround system, etc. Specifically, Japanese
Patent Application Laid-Open Nos. 2003-87134 and 2001-195100, The techniques described in
JP-A-2001-69597, JP-A- 6-303692 and the like can be used. According to a third aspect of the
present invention, there is provided an electronic camera comprising: an imaging section for
converting an optical image into an image signal for acquisition; and imaging information (for
example, brightness, object distance information, imaging date and time, etc.) at the time of
acquiring the image signal. An information storage unit for storing at least one of user setting
information (for example, landscape mode, exposure correction, Exif information can be used) at
the time of image signal acquisition (ie, at the time of imaging), image signal and sound signal are
stored And a sound signal processing unit that processes the sound signal based on the
information stored in the information storage unit. For example, if it is determined from the
shooting information or user setting information that imaging and recording have been
performed indoors, it is determined that the recording state is also good, so sound output is
performed in the raw state, When it is determined that imaging and recording have been
performed, it may be difficult to hear voice and the like, so it is conceivable to perform sound
output after processing so as to raise the midrange.
Furthermore, the image processing apparatus further comprises an interface unit that transmits
the image signal stored in the storage unit and the sound signal after processing to an external
monitor, and the sound signal processing unit is configured to transmit the external signal to the
external monitor. Before transmitting the image signal and the sound signal stored in the storage
unit, information related to sound reproduction is input from the external monitor via the
interface unit, and information related to the sound reproduction is stored in the information
storage unit It is preferable to process the sound signal in accordance with the information being
processed. DETAILED DESCRIPTION OF THE INVENTION A camera according to an embodiment
of the present invention will be described in detail below with reference to the drawings. FIG. 1 is
an external view showing an embodiment of a digital still camera 100 which is an example of an
electronic camera to which the present invention is applied, and FIG. 1 (a) is a front perspective
view of the digital still camera 100; ) Is a rear perspective view. In FIG. 1, an imaging unit 24 for
picking up an object, an auxiliary light emitting unit 30 for emitting auxiliary light to the object,
and a composition including the object by the photographer looking at the front of the digital still
camera 100 The image display unit 8 has an optical finder 25 that can be used to display
photographed images and the like on its back, an information display unit (so-called status LCD)
26 that displays the photographing setting status etc., a NEXT button 21c as a selection unit 21 d
is provided with an operation SW (switch) 21 for operating setting and switching of various
functions including 21 d, and a release switch 21 a for performing shutter release on the upper
surface of the digital still camera 100. In addition, the detailed description in each structure part
is described together with the description of the functional structure mentioned later. The
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flashlight unit is not shown because of the pop-up type. Further, although not shown in FIG. 1, at
the bottom of the digital still camera 100, a memory slot for mounting a memory card 9 which is
a storage unit here is provided. FIG. 2 is a block diagram showing a functional configuration of
the digital still camera 100. As shown in FIG. In FIG. 2, the digital still camera 100 includes a lens
unit 1 as an imaging optical system, an imaging unit 24 including an aperture 2 and a CCD 3, an
imaging circuit 4, an A / D conversion circuit 5, a memory 6, a D / A conversion circuit 7, Image
display unit 8 as display means, compression / expansion circuit 10, CPU 11, TG 12, AE / AF
processing circuit 13, CCD driver 14, diaphragm drive motor 15, diaphragm drive motor drive
circuit 16, optical system drive motor 17, optical system drive Motor drive circuit 18, battery 19,
flash memory 20 as non-volatile memory unit, operation switch 21 including zoom switch ST,
etc., flash light emitting unit 22, auxiliary light emitting unit 30 (auxiliary light emitting unit for
AF or red eye reduction lamp And a switching circuit 23 and an information display unit 26.
The imaging unit 24 forms a lens unit 1 for capturing an optical image of an object, which will be
described later, a diaphragm 2 for adjusting the light quantity of light flux transmitted through
the lens unit 1 and imaging on the light path of the lens unit 1. The charge coupled device (CCD)
3 photoelectrically converts the optical image of the subject, and outputs the photoelectrically
converted image signal (analog signal) to the imaging circuit 4. The image pickup circuit 4
performs various image processing such as sensitivity correction of the image signal input from
the CCD 3 in synchronization with the timing signal input from the TG 12 to generate a
predetermined image signal, and performs A / D conversion. It outputs to the circuit 5. The A / D
conversion circuit 5 converts the input image signal from an analog signal to a digital signal, and
outputs an image signal to the memory 6 or the AE / AF processing circuit 13 according to an
instruction of the CPU 11. The memory 6 is composed of a buffer memory and the like, and
temporarily stores the input image signal. Further, when the memory 6 receives an image display
instruction from the CPU 11, the memory 6 outputs the image signal instructed to display the
image to the D / A conversion circuit 7, and the D / A conversion circuit 7 converts the input
image signal into analog. At the same time, processing is performed to adapt to output display,
and the image is displayed on the image display unit 8. On the other hand, when the memory 6
receives an image storage instruction from the CPU 11 when a predetermined condition
described later is satisfied, the memory 6 outputs an image signal (for example, in JPEG format)
instructed to store the image to the compression / decompression circuit 10 to perform
compression / decompression. The circuit 10 outputs the input image signal to the memory card
9. The image display unit (also referred to as a display unit) 8 includes a TFT (Thin Film
Transistor) or the like, and outputs and displays an image signal input from the D / A conversion
circuit 7. The display is not limited to the image, and may be, for example, a text screen such as a
menu screen for function selection. When the memory card 9 receives an image reading
instruction from the CPU 11, the memory card 9 outputs the image signal instructed to be read
to the compression / decompression circuit 10, and the compression / decompression circuit 10
decompresses the input image signal to execute memory Output to 6. The compression /
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decompression circuit 10 compresses the image signal input from the memory 6 according to a
predetermined coding method, and the image input from the memory card 9 to display the image
signal instructed to be read out on the screen. And a decompression circuit that decodes and
decompresses the signal. That is, the compression and decompression circuit 10 has a function
as compression means.
An image processing means, an imaging condition changing means, and a central processing unit
(CPU) 11 as a processing condition changing means read out various application programs
related to imaging stored in the flash memory 20 to a work area (not shown) Various processing
such as photographing processing according to the program is executed, and the processing
result is displayed on the image display unit 8 or the information display unit 26. The CPU 11
drives and controls the AE / AF processing circuit 13 according to the half depression of the
release switch 21a (FIG. 1), determines the exposure condition from the obtained photometric
value, and performs AF processing of the lens unit 1 Drive to the in-focus position detected by
the camera, execute exposure processing in response to full depression of the release switch 21a,
perform image processing and digital conversion on the generated image signal, temporarily
store in the memory 6, and then execute predetermined processing. According to the conditions,
the compression / decompression circuit 10 compresses the image signal and outputs it to the
memory card 9. The TG (Timing Generator) 12 generates a predetermined timing signal and
outputs it to the imaging circuit 4, the CPU 11, and the CCD driver 14. AE (Auto Exposure:
automatic exposure control) · AF (Auto Focus: automatic focus control) processing circuit 13
detects an in-focus position and an AE processing circuit that executes an AE process that detects
an appropriate exposure condition And an AF processing circuit that executes an AF process.
Each process is executed on an image signal input from the A / D conversion circuit 5 in
accordance with an instruction from the CPU 11. In the AE processing, the AE processing circuit
performs arithmetic processing such as cumulative addition on the luminance value of one
screen or in a predetermined area within the screen, and based on the processing result, an
appropriate processing at the time of actual exposure is performed. The exposure condition is
calculated and output to the CPU 11. On the other hand, in the AF processing, the AF processing
circuit calculates an AF evaluation value for an input one screen or a predetermined area in the
screen, and outputs the calculation result to the CPU 11. The AF evaluation value has such a
characteristic that the value increases as focus is achieved, and when a graph is created with
each lens position on the horizontal axis and the AF evaluation value on the vertical axis, the infocus point is the vertex A mountain is formed. That is, by comparing the AF evaluation values
obtained while moving the lens unit 1 with each other, the peak of the mountain, that is, the infocus point can be obtained. An operation for obtaining the AF evaluation value in this manner is
called a search operation.
The AF evaluation value is calculated by analyzing the frequency of the image signal with respect
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to the input one screen or a predetermined area in the screen. In the frequency analysis, a band
pass filter is configured in a soft manner, the integral value of the image signal intensity passing
through the band pass filter is calculated, and the calculation result is used as an AF evaluation
value. That is, the AF evaluation value is contrast (difference between light and dark) information,
and is calculated by performing an operation to obtain the intensity of a specific frequency
included in the image. Here, the AF processing by the CPU 11 and the AF processing circuit will
be described. The CPU 11 drives and controls the optical system drive motor drive circuit 18
which is drive means to cause the CCD 3 to gradually generate an image signal at each lens
position while moving the second lens group of the lens unit 1. The AE / AF processing circuit 13
calculates an AF evaluation value for each image signal input from the A / D conversion circuit 5,
compares the AF evaluation value, and detects the lens position which is the maximum AF
evaluation value as an in-focus point. Output to When receiving an instruction from the CPU 11,
the CCD driver 14 drives and controls the CCD 3 in synchronization with a timing signal input
from the TG 12. Specifically, control of the charge accumulation time of the CCD 3 according to
the exposure adjustment control is performed. The diaphragm drive motor drive circuit 16
controls the drive of the diaphragm drive motor 15 in accordance with an instruction from the
CPU 11, and the diaphragm drive motor 15 drives the diaphragm 2. The optical system drive
motor drive circuit 18 controls the drive of the optical system drive motor 17 according to an
instruction from the CPU 11, and the lens unit 1 is driven by the drive force of the optical system
drive motor 17, whereby the lens unit 1 is specified. Move to the position of. The battery 19 is a
power source for supplying power to each component of the digital still camera 100. For
example, a lithium battery, an alkaline dry battery, or the like is applied. A flash memory
(EEPROM (Electrically Erasable Programmable Read-Only Memory) 20 is also used to store
various application programs, processing programs and the like related to imaging of the digital
still camera 100, and also stores information to be described later. It is possible. The operation
SW (switch) 21 includes various operation switches such as a mode switch for switching
functions such as the release switch 21a, the NEXT button 21c, and the determination button
21d, and a menu SW for selecting settings.
When each switch is operated, a signal is generated and output to the CPU 11. The release switch
21a is composed of a two-step switch consisting of a half-press release switch that starts AE and
AF processing prior to a photographing operation, and a full-press release switch that starts
actual exposure processing. The flash light emitting unit 22 is a light emitting unit that emits
strobe light to the subject when the luminance of the surrounding environment detected at the
time of shooting is insufficient, and the light emission timing, the light emission amount, etc. are
controlled by the switching circuit 23 Ru. A microphone / speaker (also referred to as a built-in
speaker but may be a separate body) 27 collects sound and voice at the time of shooting and
transmits it as a sound signal to the CPU 11 and based on the sound signal transmitted from the
CPU 11 Act to emit sounds and sounds. Furthermore, the CPU 11, which is a sound signal
processing unit, has a function of processing the sound signal so as to change the volume, the
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sound quality, and the like at the time of reproduction based on the output sound signal. The
interface 28 is connected to an external monitor M by a cable C, so that it can receive
information from the monitor M and can transmit an image signal and a sound signal to the
monitor M. The interface 28 may communicate with the monitor M not via cable or the like but
via radio such as IrDA or Bluetooth. The monitor M has a display MD and a speaker MS, and prestores information on sound reproduction to be described later. Next, the operation of the digital
still camera 100 according to the present embodiment will be described with reference to the
drawings. FIG. 3 is a flowchart showing control of the operation of the digital still camera 100.
First, on the premise that the power switch (not shown) is turned on, the CPU 11 performs mode
determination in step S101 of FIG. That is, when it is determined that the reproduction mode is
set according to the operation of the mode setting button (not shown) of the operation switch 21
by the user, the CPU 11 is connected to the cable C, for example, in step S102. If it is determined
that communication is possible, the external monitor M is accessed in step S103, and information
on sound reproduction is input. Here, the information related to sound reproduction is
information indicating the current characteristics or settings of the external monitor M, and
includes, for example, the following contents.
(1) Setting volume: large, medium, small (2) sound quality: high frequency emphasis, low
frequency emphasis, flat (3) whether stereo output is possible (4) setting balance: (left 1: right 2),
(left 1: Right 1), (Left 2: Right 1) Here, the information on the sound reproduction obtained from
the monitor M is set volume (small), sound quality (low range emphasis), stereo output possible,
setting balance (left 1) : Suppose that the right 2) is shown. In step S104, the CPU 11 reads the
sound signal stored in the memory card 9 in association with the image signal, and processes the
sound signal based on the input information related to sound reproduction. More specifically,
since the set volume of the monitor M is (small), the sound signal is amplified so that the volume
becomes a medium level in the set state. Further, since the setting sound quality of the monitor
M is (low-frequency emphasis), a high-pass filter or the like is applied to the sound signal so as to
have a flat characteristic. Furthermore, when the stored sound signal is monaural compatible,
pseudo stereo processing is applied to it. The pseudo stereo processing is described in, for
example, WO 99/35886, and thus the details will not be described below. Also, when the setting
balance of the monitor M is (left 1: right 2), it should match the position of the listener, so it is
not changed, but it is changed to be (left 1: right 1) It is good. The processing of the sound signal
is not limited to the above change. In step S105, the CPU 11 outputs the image signal and the
processed sound signal to the monitor M from the interface 28 via the cable C. As a result, the
user can listen to the sound reproduced with the optimum sound quality from the speaker MS
while viewing the image on the display MD of the monitor M. Next, another embodiment of the
present invention will be described. Even when information on sound reproduction can not be
input from the external monitor M, or even when information on sound reproduction is input, the
processing of the sound signal on the digital still camera 100 side can be changed according to
the preference of the user. FIG. 4 is an enlarged view of the rear surface of the digital still camera
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100. As shown in FIG. For example, when it is determined that the manual processing mode is set
by the operation of the mode setting button (not shown) when the information regarding sound
reproduction can not be input from the monitor M, the CPU 11 displays the display shown in FIG.
Display on section 8. Here, the user can arbitrarily change the processing content of the sound
signal by using the NEXT button 21c, and by pressing the determination button 21d, the
processing content can be determined and made to be processed by the CPU 11.
The processed sound signal is transmitted to an external monitor M as in the above-described
embodiment. FIG. 5 is a control flowchart at the time of reproduction in the digital still camera
according to another embodiment. The configuration itself of the digital still camera is the same
as that shown in FIGS. If it is determined in step S201 that the CPU 11 determines that the
reproduction mode is not set, the flow is ended, but if it is determined that the reproduction
mode is set, the sound data is read from the memory card 9 in step S202. . Further, in step S203,
the CPU 11 determines, for example, whether or not the cable C is connected, and if it is
determined that it is not connected, in step S211, it is incorporated as information on sound
reproduction (also referred to as sound reproduction information) A speaker standard value is
set, based on which the sound signal processing is performed in step S212, and the processed
sound signal is output through the built-in speaker 27 in step S213. Although the built-in
speaker 27 tends to have low bass generally because the outside diameter is reduced in order to
make the camera body compact, it is preferable to emphasize the bass to correct this. On the
other hand, when it is determined in step S203 that the external monitor M is connected via the
cable C, the CPU 11 further determines in step S204 whether or not communication is possible.
Here, if the external monitor M is not of a type that can transmit information, the CPU 11
determines that communication is not possible, and sets an external monitor standard value as
sound reproduction information in step S210, and based on that, performs sound signal
processing in step S208. And the processed sound signal is output to an external monitor at step
S213. On the other hand, if the external monitor M can transmit information, the CPU 11
determines that communication is possible in step S 204, and thus the sound reproduction
information is input from the external monitor M in step S 205. Furthermore, in step S206, the
imaging information (imaging information) and user setting information (for example, scene
mode) are acquired by reading out the imaging data stored in the memory card 9 also serving as
the information storage unit, and in step S207 The external monitor custom value is created
based on the sound reproduction information from M and the acquired information. The CPU 11
performs sound signal processing in step S208 based on the created external monitor custom
value, and outputs the processed sound signal to the external monitor in step S213.
As a result, it is possible to output an optimal sound from the external monitor M, taking into
consideration the conditions at the time of imaging, such as whether the imaging and recording
were performed outdoors in a house where the imaging and recording were performed indoors.
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Although the present invention has been described above with reference to the embodiments, the
present invention should not be construed as being limited to the above embodiments, and it
goes without saying that appropriate modifications and improvements are possible. is there. For
example, electronic cameras include not only digital still cameras but also video cameras.
According to the present invention, it is possible to provide an electronic camera capable of
providing a listener with sound of higher sound quality. BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an external view showing an embodiment of a digital still camera 100 which is an
example of a camera to which the present invention is applied. FIG. 1 (a) is a front perspective
view of the digital still camera 100. FIG. 1 (b) is a rear perspective view. FIG. 2 is a block diagram
showing a functional configuration of the digital still camera 100. FIG. 3 is a flowchart
illustrating processing executed by the digital still camera according to the present embodiment.
FIG. 4 is a view showing a part of the back of the digital still camera 100. FIG. FIG. 5 is a control
flowchart at the time of reproduction in a digital still camera according to still another
embodiment. Explanation of symbols 8 image display unit 11 CPU 21 operation switch 100
digital still camera M external monitor
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