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DESCRIPTION JP2006229329

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DESCRIPTION JP2006229329
PROBLEM TO BE SOLVED: To provide an imaging device which has been made in consideration
of the above-mentioned circumstances and can sufficiently exhibit the performance of an
external microphone and an internal microphone. SOLUTION: A changeover switch 4 switches
and outputs an audio signal from one of an internal microphone device 2 and an external
microphone device 1 connected via an external microphone connection shoe 2. The A / D
converter 5 analog / digital converts the audio signal output from the changeover switch 4 and
outputs a digital audio signal. The control device 8 reads external microphone information from
the external microphone device 2 connected to the external microphone connection shoe 2,
determines the performance of the external microphone device 2 from the read external
microphone information, and determines the quantum in the A / D converter 5. Control the
number of bits and / or the sampling rate. [Selected figure] Figure 1
Imaging device
[0001]
The present invention relates to an imaging device, and more particularly, to recording
technology in an imaging device such as a digital camera and a digital video camera.
[0002]
A configuration example of a recording function in a conventional imaging device is shown in
FIG.
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As shown in FIG. 4, conventionally, when the external microphone 101 is not connected to the
external microphone connection shoe 103, the built-in microphone 102 is selected by the
changeover switch 104, and the external microphone 101 is connected to the external
microphone connection shoe 103. If the external microphone 101 is selected, the external
microphone 101 is selected by the changeover switch 104 and an audio signal is input to the A /
D converter 105. The A / D converter 105 converts the input audio signal into digital data with a
fixed number of quantization bits and a sampling rate. The DSP 106 performs constant audio
signal compression on the converted digital data, and outputs compressed data. The output
compressed data is recorded on the recording medium by the recording device 107 together
with the video signal.
[0003]
For example, a technique is disclosed in which an external microphone is connected to a video
camera having a built-in microphone and switching between the built-in microphone and the
external microphone is performed by a switch provided on the external microphone (see, for
example, Patent Document 1).
[0004]
Unexamined-Japanese-Patent No. 2004-222131
[0005]
However, in the conventional imaging apparatus described above, even if the external
microphone 101 of any performance is connected to the external microphone connection shoe
103, recording is performed under exactly the same conditions as when the built-in microphone
102 is used, and the performance of the external microphone There is a problem that it may not
be able to demonstrate enough.
In addition, there is a problem that the built-in microphone may exhibit better recording
performance when performing short distance imaging in a state where an external microphone
with remarkable directivity is used, and this can not be coped with.
[0006]
The present invention has been made in consideration of the above-described circumstances, and
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an object of the present invention is to provide an imaging device capable of sufficiently
exhibiting the performance of an external microphone and an internal microphone.
[0007]
The present invention has been made to solve the above-mentioned problems, and in the image
pickup apparatus according to the present invention, an external microphone having a recording
medium recording external microphone information including at least performance information,
identification information, or both Connection means for switching and outputting an audio
signal from any one of a connection means capable of connecting a microphone, an internal
microphone, and an external microphone connected to the internal microphone and the
connection means, and an external microphone Reading means for reading out external
microphone information from the recording medium of the external microphone connected when
connected to the conversion means, and conversion means for converting the audio signal output
from the switching means into analog / digital conversion and outputting a digital audio signal;
Data format conversion means for converting digital audio signals output from the conversion
means into a predetermined data format and outputting audio data of a predetermined format A
shooting means for outputting the shot video data; a recording means for recording the audio
data of a predetermined format output by the data format conversion means and the video data
output by the shooting means on a recording medium; and external microphone information read
by the reading means And controlling means for controlling the number of quantization bits and
/ or the sampling rate in the converting means by judging the performance of the external
microphone from the above.
Thereby, it is possible to perform analog / digital conversion with the optimal number of
quantization bits and / or the sampling rate according to the performance of the external
microphone.
[0008]
In one embodiment of the image pickup apparatus according to the present invention, in the
image pickup apparatus for recording an image signal and an audio signal, an external
microphone connection unit to which an external microphone can be connected and an external
microphone connected to the external microphone connection unit Microphone information
acquisition means for acquiring microphone information possessed by the imaging information
acquisition means for acquiring imaging information of the imaging optical system, conversion
means for performing analog / digital conversion of an audio signal, and a microphone of an
external microphone acquired by the information acquisition means It is characterized in that it
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comprises: changing means for changing the quantization bit or sampling rate set by the
converting means based on the information and the photographing information of the
photographing optical system acquired by the photographing information acquiring means.
[0009]
In one embodiment of the image pickup apparatus according to the present invention, in the
image pickup apparatus for recording an image signal and an audio signal, a built-in microphone
built in the image pickup apparatus and an external microphone connection unit capable of
connecting an external microphone. Microphone information acquisition means for acquiring
microphone information of an external microphone connected to the external microphone
connection means, imaging information acquisition means for acquiring imaging information of
the imaging optical system, microphone information of the external microphone acquired by the
information acquisition means And switching means for switching whether to output an audio
signal from the built-in microphone or to output an audio signal from the external microphone
based on the imaging information of the imaging optical system acquired by the imaging
information acquisition means.
[0010]
In one embodiment of the image pickup apparatus according to the present invention, in the
image pickup apparatus for recording an image signal and an audio signal, an external
microphone connection unit to which an external microphone can be connected and an external
microphone connected to the external microphone connection unit Microphone information
acquisition means for acquiring microphone information possessed by the imaging information
acquisition means for acquiring imaging information of the imaging optical system, compression
processing means for compressing the audio signal, and microphone information of the external
microphone acquired by the information acquisition means And changing means for changing
the compression rate set by the compression processing means based on the photographing
information of the photographing optical system acquired by the photographing information
acquisition means.
[0011]
The imaging device according to the present invention can fully exhibit the performance of the
external microphone and the internal microphone.
[0012]
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Hereinafter, preferred embodiments of the present invention will be described with reference to
the drawings.
First Embodiment First, a schematic configuration of an imaging device according to a first
embodiment of the present invention will be described.
FIG. 1 is a diagram showing a schematic configuration of an imaging device according to a first
embodiment of the present invention.
Note that since the part that is the feature of the present invention relates to the recording
function of the imaging apparatus, FIG. 1 mainly shows the schematic configuration of the part
related to the recording function of the imaging apparatus.
[0013]
In FIG. 1, reference numeral 10 denotes an imaging device, which has a function of switching
between an internal microphone device 2 and an external microphone device 1 to be described
later to record voice.
Reference numeral 1 denotes an external microphone device, which has a recording medium for
storing its own performance information (hereinafter referred to as external microphone
information) in addition to a microphone function for converting voice into an audio signal and
outputting it.
Further, the external microphone device 1 is configured to be connectable to an external
microphone connection shoe 3 described later, and supplies an audio signal to the imaging
device 10 via the external microphone connection shoe 3.
[0014]
Further, the performance information of the external microphone device 1 itself described above
is, for example, information on sound collection performance such as directivity characteristics
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and noise characteristics of the external microphone device 1. The external microphone
information supplied to the imaging device 10 by the external microphone device 1 is not limited
to the performance information of the external microphone device 1 described above, and
identification information of the external microphone device 1 itself, manufacturer information,
etc. Or may be used together. When using the identification information of the external
microphone device 1 itself, it is assumed that an information table capable of specifying
information related to the performance of the external microphone device 1 based on the
identification information is prepared in the control device 8 described later. Do.
[0015]
The built-in microphone device 2 is a built-in microphone provided to the imaging device 10
from the beginning. The external microphone connection shoe 3 is for making it possible to use
an external microphone in the imaging device 10. For example, when the external microphone
device 1 is connected, the external microphone connection shoe 3 outputs an audio signal from
the external microphone device 1 to the switch 4. Also, external microphone information from
the external microphone device 1 is output in response to a request from the control device 8
described later.
[0016]
The changeover switch 4 switches an audio signal from the external microphone device 1 or the
internal microphone device 2 and outputs the signal to an A / D converter 5 described later.
Specifically, when the external microphone device 1 is connected to the external microphone
connection shoe 3, an audio signal from the external microphone device 1 is selected to be
output to the A / D converter 5. Further, the changeover switch 4 selects to output an audio
signal from the internal microphone device 2 to the A / D converter 5 when the external
microphone device 1 is not connected to the external microphone connection shoe 3.
[0017]
The A / D converter 5 performs analog / digital conversion processing on the audio signal input
from the changeover switch 4 according to the number of quantization bits and the sampling rate
according to the control by the control device 8 described later, digital data (digital audio signal
Output).
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[0018]
A DSP (Digital Signal Processor) 6 performs audio compression processing on digital data output
by the A / D converter 5 and outputs compressed data.
The recording device 7 performs a process of recording the compressed data output by the DSP
6 on a recording medium.
[0019]
The control device 8 has a function of acquiring external microphone information from the
recording medium of the external microphone device 1 via the external microphone connection
shoe 3 when the external microphone device 1 is connected to the external microphone
connection shoe 3 and photographing described later And a function of acquiring imaging
information of the imaging optical system from the apparatus 9. Furthermore, the control device
8 controls the number of quantization bits or the sampling rate of the A / D converter 5 based on
the acquired external microphone information and imaging information. Thereby, the output of
the external microphone device 1 can be A / D converted with the optimum number of
quantization bits and the sampling rate according to the imaging situation.
[0020]
The photographing device 9 includes an optical system such as a lens and an aperture, an
imaging device such as a CCD, and a video signal processing device that generates a video signal
based on an output signal of the imaging device. Output. Thereby, the recording device 7 records
the digital video signal outputted by the photographing device 9 together with the (audio)
compressed data outputted by the DSP 6 on the recording medium. Further, the photographing
device 9 outputs information such as focal distance information of the lens, focusing distance
information, depth of field information and the like to the control device 8 of photographing
information of the photographing optical system. In the case of an imaging apparatus in which a
plurality of shooting scene modes are set in advance and one shooting scene mode is selected
among them, the selected shooting scene mode is output to the control device 8 as shooting
information.
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[0021]
A control example of the sampling rate and the number of quantization bits of the A / D
converter 5 will be described below by showing a specific example of the imaging information.
For example, when distance information is acquired from a focus position with respect to an
object of shooting information, and it is determined that shooting of an object at a short distance
is performed, the connected external microphone device 1 has high directivity. In the case of a
microphone, the internal microphone device 2 is selected, and control is performed so that the
sampling rate of the A / D converter 5 and the number of quantization bits according to the
performance of the internal microphone device 2 become. Conversely, when it is determined that
the subject is photographed at a long distance, the external microphone device 1 is selected, and
the sampling rate and the number of quantization bits of the A / D converter 5 are controlled to
the optimum values for the external microphone device 1 .
[0022]
As in the above example, the range in which the subject is present can be known from the
shooting information, and the sound collection characteristic of the external microphone device 1
can be known from the microphone information. Therefore, if the subject is present in a good
sound collection characteristic, A / D If the number of quantization bits of converter 5 is
increased or the sampling rate is increased, and the subject does not exist in a good sound
collection characteristic range, the number of quantization bits of A / D converter 5 is decreased,
the sampling rate Lower the
[0023]
With the above configuration, when the external microphone device 1 is connected to the
external microphone connection shoe 3, the imaging device 10 according to the first
embodiment is A / D according to the performance of the external microphone device 1 and the
photographing condition. By controlling the converter 5, the audio signal from the external
microphone device 1 can be digitized with an appropriate number of quantization bits and a
sampling rate.
[0024]
Second Embodiment Next, a schematic configuration of an imaging device according to a second
embodiment of the present invention will be described.
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FIG. 2 is a diagram showing a schematic configuration of an imaging apparatus according to a
second embodiment of the present invention.
In FIG. 2, reference numerals 21 to 23, 25 to 27, and 29 have the same configurations as 1 to 3,
5 to 7, and 9 in FIG.
[0025]
In FIG. 2, reference numeral 20 denotes an imaging device. The changeover switch 24 switches
the audio signal from the external microphone device 21 or the internal microphone device 22
according to the control from the control device 28 and outputs it to an A / D converter 25
described later. The control device 28 controls the number of quantization bits and the sampling
rate of the A / D converter 25 based on the external microphone information acquired from the
external microphone device 21 and the imaging information acquired from the imaging device
29, and Control.
[0026]
According to the configuration described above, when the external microphone device 21 is
connected to the external microphone connection shoe 23, the imaging device 20 according to
the second embodiment is A according to the performance of the external microphone device 21
and the photographing situation. By controlling the / D converter 25, it is possible to digitize the
audio signal from the external microphone device 21 with an appropriate number of quantization
bits and sampling rate, and according to the performance of the external microphone device 21
and the photographing situation. Thus, the audio signal from the external microphone device 21
or the internal microphone device 22 can be switched appropriately.
[0027]
For example, in the control device 28, it is determined from the external microphone information
from the external microphone device 21 that the performance of the external microphone device
21 has strong directivity, and focus control information of the lens in the imaging device 29 as
imaging information. When it is determined from the focus control information that the short
distance shooting is to be performed, the control device 28 controls the changeover switch 24 to
switch to the built-in microphone device 24.
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This makes it possible to cope with the case where the built-in microphone exhibits better
recording performance when performing short distance imaging while using an external
microphone with remarkable directivity. That is, the imaging device 20 can fully exhibit the
performance of the external microphone device 21 and the internal microphone device 22.
[0028]
Third Embodiment Next, a schematic configuration of an imaging device according to a third
embodiment of the present invention will be described. FIG. 3 is a diagram showing a schematic
configuration of an imaging device according to a third embodiment of the present invention. In
FIG. 3, reference numerals 31 to 35, 37 and 39 have the same configuration as 21 to 25, 27 and
29 in FIG. 2, so the description will be omitted.
[0029]
In FIG. 3, reference numeral 30 denotes an imaging device. The DSP 36 subjects the digital data
output by the A / D converter 35 to audio compression processing, and outputs compressed data.
At this time, the DSP 36 variably performs the audio compression process at an optimal
compression rate according to the control from the control device 38. Similar to the control
device 28 of FIG. 2, the control device 38 calculates the number of quantization bits of the A / D
converter 35 and sampling based on the external microphone information acquired from the
external microphone device 31 and the imaging information acquired from the imaging device
39. While controlling the rate, it has a function to control the changeover switch 24.
Furthermore, the control device 38 controls the compression rate of the audio compression
process in the DSP 36 based on the external microphone information acquired from the external
microphone device 31 and the imaging information acquired from the imaging device 39.
[0030]
According to the configuration described above, the imaging device 30 according to the third
embodiment has the performance of the external microphone device 31 in addition to the same
effect as the effect of the imaging device 20 according to the second embodiment described
above, By controlling the compression rate of the DSP 36 in accordance with the imaging
situation, the audio signal can be compressed at an appropriate compression rate.
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[0031]
In the imaging devices 10, 20, and 30 in the above-described first to third embodiments, the
imaging based on the performance of the external microphone device based on the external
microphone information and the imaging information Although various controls (control of the
changeover switch, A / D converter, DSP, etc.) were performed according to the situation, various
controls using any one of the performance information of the external microphone device and
the photographing information of the photographing optical system You may
The embodiment of the present invention has been described in detail with reference to the
drawings. However, the specific configuration is not limited to this embodiment, and includes
design and the like within the scope of the present invention.
[0032]
It is a figure showing a schematic structure of an imaging device in a 1st embodiment of the
present invention. It is a figure which shows schematic structure of the imaging device in the 2nd
Embodiment of this invention. It is a figure which shows schematic structure of the imaging
device in the 3rd Embodiment of this invention. It is a figure which shows schematic structure of
the recording function of the conventional imaging device.
Explanation of sign
[0033]
1, 21, 31 External microphone device 2, 22, 32 Built-in microphone device 3, 23, 33 External
microphone connection shoe 4, 24, 34 selector switch 5, 25, 35 A / D converter 6, 26, 36 DSP 7,
27 , 37 Recording device 8, 28, 38 Control device 9, 29, 39 Shooting device
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