JP2006340247

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DESCRIPTION JP2006340247
PROBLEM TO BE SOLVED: To provide a recording apparatus and a method of adjusting the
recording apparatus, which is applied to, for example, a portable video camera for recording an
imaging result on an optical disk, and easily and reliably desired even in recording using an
external microphone. An audio signal can be acquired and recorded according to sound
characteristics. SOLUTION: When recording an audio signal by an external microphone 12, the
characteristic of a corresponding correction circuit 5 is set by a correction parameter 13 for the
external microphone acquired from the external microphone 12. [Selected figure] Figure 1
Recording apparatus and adjustment method of recording apparatus
[0001]
The present invention relates to a recording apparatus and an adjustment method of the
recording apparatus, and can be applied to, for example, a portable video camera which records
an imaging result on an optical disk. According to the present invention, when recording an audio
signal from an external microphone, even by recording using an external microphone, the
characteristic of the corresponding correction circuit is set by the correction parameter for the
external microphone acquired from the external microphone. An audio signal can be acquired
and recorded according to a desired sound collection characteristic simply and surely.
[0002]
2. Description of the Related Art Conventionally, portable video cameras that record imaging
results and audio signals on an optical disc have been provided that record audio signals
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acquired by a built-in microphone on an optical disc by a 5.1 channel multi-channel.
[0003]
In such a video camera, audio signals from various directions are obtained by a plurality of
microphones, and there is one that generates 5.1 channel audio signals by arithmetic processing
of these audio signals.
In addition, the characteristics of each microphone and the characteristics of the signal
processing circuit that processes the audio signal of each microphone are adjusted at the time of
factory shipment, whereby the sound collection characteristic of the audio signal obtained from
each microphone is set to the reference sound collection characteristic and high. It is set to be
able to create a 5.1 channel sound field with a sense of reality. Here, the sound collection
characteristics are various characteristics of the audio signal that affect the creation of such a
multi-channel sound field, and are various characteristics such as directivity, frequency,
sensitivity and the like.
[0004]
Here, in the adjustment at the time of shipment from the factory, a characteristic necessary for
correction is obtained in advance from the sound collection characteristic of the audio signal
output from the microphone, and the signal necessary for the correction can be secured. A
correction parameter is set in a correction circuit provided in the processing circuit, or a
correction parameter is set in a circuit adjustment program. As a result, in the video camera of
this type, the sound collection characteristic of the audio signal from each microphone is set to
the reference sound collection characteristic, and the variation or the like of each microphone is
corrected.
[0005]
With regard to such correction of the characteristics of the microphone, various methods have
been proposed, for example, in Japanese Patent Laid-Open No. 6-292293.
[0006]
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By the way, in such a video camera, an audio signal may be recorded by an external microphone
desired by the user instead of the built-in microphone.
However, such external microphones often differ in characteristics from the built-in
microphones. As a result, if an audio signal is acquired by an external microphone instead of
simply the built-in microphone, there is a problem that the audio signal can not be acquired due
to a desired sound collection characteristic, thereby recording the audio signal by a highly
realistic sound field In the end, the external microphones used will be restricted.
[0007]
One way to solve this problem is to adjust the video camera according to the external
microphone. That is, as shown in FIG. 14, with the external microphone 2 connected to the video
camera 1, the external microphone 2 and the sound source S are arranged at predetermined
characteristic adjustment positions, and the reference signal is reproduced by the sound source
S. Pick up by Here, the external microphone 2 is a microphone unit (M1) 3 that is a mechanicalelectrical conversion unit that converts a change in sound pressure into an audio signal, and a
peripheral circuit that amplifies the audio signal output from the microphone unit 3 A1)
Composed of four. Depending on the type of microphone unit 3, a drive circuit for driving the
microphone unit 3 is further provided in the peripheral circuit 4. On the other hand, the video
camera 1 corrects the characteristics of the audio signal output from the external microphone 2
and the signal processing circuit (D) 6 processes the audio signal whose characteristics are
corrected by the correction circuit 5. In this adjustment, the characteristic (C1) of the correction
circuit 5 is set such that the audio signal S1 output from the signal processing circuit 6 has a
desired sound collection characteristic. The correction circuit 5 includes an amplifier circuit for
amplifying the audio signal, an analog-to-digital converter circuit for converting the audio signal
into an analog to digital signal and outputting the audio data, and a filter circuit for setting
frequency characteristics of the audio data. The signal processing circuit 6 executes processing
such as setting the directivity of the audio signal to the desired directivity by arithmetic
processing with audio data obtained from other microphones.
[0008]
In this way, as shown in FIG. 15, even when using the external microphone 2, it is possible to
acquire an audio signal with a desired sound collection characteristic, thereby forming a highly
realistic sound field it can.
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[0009]
However, in this case, adjustment is time-consuming, and some users may not be able to perform
such adjustment.
Although a method of providing such an adjustment mechanism on the external microphone side
can also be considered, this case also has the same drawback. Japanese Patent Application LaidOpen No. 6-292293
[0010]
The present invention has been made in consideration of the above points, and a recording
device and a recording device capable of acquiring and recording an audio signal according to a
desired sound collection characteristic simply and reliably even in recording using an external
microphone It is intended to propose a method of adjustment.
[0011]
In order to solve such problems, the invention according to claim 1 is applied to a recording
device for acquiring audio signals by a plurality of microphones and recording the audio signals
on a recording medium, and outputting a plurality of built-in microphones for outputting the
audio signals; A correction circuit which switches characteristics according to a correction
parameter for correction and corrects and outputs characteristics of an audio signal from the
built-in microphone to a reference characteristic, and recording the audio signal output from the
correction circuit on the recording medium And the correction circuit inputs an audio signal from
an external microphone to the correction circuit and records the audio signal on the recording
medium, instead of all or a part of audio signals of the plurality of built-in microphones. A
characteristic of the correction circuit corresponding to a correction parameter for an external
microphone acquired from the external microphone; By constant, and outputs the corrected
audio signal to the characteristics of the reference by the external microphone.
[0012]
Further, the invention of claim 6 is applied to a method of adjusting a recording device in which
audio signals are acquired by a plurality of microphones and recorded in a recording medium,
and the recording device comprises a plurality of built-in microphones outputting the audio
signals; A correction circuit which switches characteristics according to a correction parameter
for the built-in microphone and corrects and outputs characteristics of an audio signal from the
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built-in microphone to a reference characteristic, and the audio signal output from the correction
circuit is used as the recording medium Recording means for recording, wherein the adjustment
method inputs an audio signal from an external microphone to the correction circuit in place of
all or a part of the audio signals of the plurality of built-in microphones to the recording medium
When recording, the correction circuit corresponding to the correction parameter for the
external microphone acquired from the external microphone By setting the sex, for recording
audio signals by the external microphone on the recording medium by correcting the
characteristics of the reference.
[0013]
According to the configuration of claim 1, the present invention is applied to a recording
apparatus which acquires audio signals by a plurality of microphones and records the audio
signals on a recording medium, and outputs the audio signals by a plurality of built-in
microphones and correction parameters for the built-in microphones. A correction circuit that
switches characteristics and corrects and outputs characteristics of an audio signal from the
built-in microphone to characteristics of a reference; and recording means for recording the
audio signal output from the correction circuit on the recording medium, The correction circuit is
acquired from the external microphone when an audio signal from an external microphone is
input to the correction circuit and recorded on the recording medium, instead of all audio signals
or part of audio signals of the plurality of built-in microphones. By setting the characteristic of
the correction circuit corresponding to the correction parameter for the external microphone If
the output audio signal by Kigaibu microphone correction to the characteristics of the reference,
even in the audio signal by the external microphone, can record by setting its properties to the
reference characteristic.
Moreover, in setting to the characteristic of this reference ¦ standard, it can set simply and
reliably.
As a result, even in the case of recording using an external microphone, it is possible to simply
and reliably acquire and record an audio signal with a desired sound collection characteristic.
[0014]
With this, according to the configuration of claim 6, there is provided a method of adjusting a
recording device capable of acquiring and recording an audio signal with desired sound
collection characteristic simply and reliably even in recording using an external microphone. Can.
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[0015]
According to the present invention, even in recording using an external microphone, it is possible
to acquire and record an audio signal with a desired sound collection characteristic simply and
reliably.
[0016]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings.
[0017]
(1) Configuration of the Embodiment FIG. 1 is a block diagram of a video camera for explaining
the principle configuration of the present invention.
The video camera 11 sets the characteristics of the correction circuit 5 by the correction
parameter (P) 13 provided in the external microphone 12 by connecting the external microphone
12.
[0018]
Thereby, in this video camera 11, as shown in FIG. 2, when using the built-in microphone, the
audio signal by the built-in microphone unit 14 provided in the video camera 11 is processed by
the peripheral circuit 15 for the built-in microphone. Thereafter, the characteristic is corrected
by the correction circuit 5 according to the characteristic (C0) for the built-in microphone, and is
set to the reference sound collection characteristic and processed by the processing circuit 6.
On the other hand, when the external microphone 12 is connected, the characteristic of the
correction circuit 5 is switched to the characteristic (C1) by the correction parameter (P) 13, and
the audio signal acquired by the external microphone 12 is corrected by this characteristic. Then,
the sound pickup characteristic of the reference is set and processed by the processing circuit 6.
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[0019]
Here, as shown in FIG. 3 in comparison with FIG. 14, the external microphone 12 is connected to
the test apparatus 18 for characteristic adjustment in adjustment work at the time of factory
shipment, and tests the audio signal of the reference signal by the sound source S. It outputs to
the device 18.
Here, the test apparatus 18 is provided with the correction circuit 5 and the processing circuit 6
according to the standard setting in the video camera 11, and in this adjustment operation, the
sound pickup characteristic of the reference of the audio signal S1 outputted from the processing
circuit 6 Thus, the characteristic C1 of the correction circuit 5 is adjusted, and the correction
parameter (P) 13 for setting the characteristic of the correction circuit 5 to the characteristic C1
is set to the external microphone 12.
[0020]
As a result, as shown in FIG. 4, in the video camera 11, it is possible to acquire and process the
sound pickup characteristic of the sound signal by the external microphone 12 with the sound
pickup characteristic similar to the sound signal by the built-in microphone. An audio signal is
recorded so as to form a realistic sound field.
[0021]
FIG. 5 is a block diagram showing the configuration of a specific video camera according to the
first embodiment.
The video camera 21 acquires the correction parameter P for the external microphone based on
a voltage value.
[0022]
That is, in the video camera 21, the correction circuit 25 corrects the sensitivity of the audio
signal by the amplifier and outputs the corrected signal to the processing circuit 6.
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This amplifier is a DC voltage control type variable gain amplifier, and its amplification factor
changes in accordance with the sensitivity adjustment voltage value generated by resistance
division by the resistance series circuit, whereby the sensitivity of the audio signal is adjusted.
Alternatively, even when the amplifier in the correction circuit 25 is not a DC voltage control
type variable gain amplifier but a digital control type variable gain amplifier with a register
setting, it is generated by resistance division by a resistance series circuit by a microcomputer
not shown. The sensitivity adjustment voltage value is analog-digital converted, and a parameter
value giving a corresponding gain from the digitized sensitivity adjustment voltage data is written
in the register.
[0023]
The correction circuit 25 is configured such that the sensitivity adjustment voltage input to one
end of the resistor series circuit is divided by the reference resistance R connected to the
reference voltage Vpp and the sensitivity division resistance r connected to the reference
resistance R. As shown in FIG. 6, it is configured so that the sensitivity can be adjusted by setting
the sensitivity adjustment resistor r. In FIG. 6, the analog-to-digital conversion processing result
(AD output) represents the 8-bit and 12-bit analog-to-digital conversion processing result when a
predetermined reference voltage is input to the analog-to-digital converter. It can be seen that
the sensitivity is increased by increasing the ratio of the sensitivity adjustment resistance r to the
reference resistance R.
[0024]
The correction circuit 25 switches the sensitivity adjustment resistance r between when
processing an audio signal by the built-in microphone unit 14 and when processing an audio
signal by the external microphone 23. When processing an audio signal by the built-in
microphone unit 14, a sensitivity adjustment resistor r corresponding to the sensitivity of the
built-in microphone unit 14 is connected to the reference resistor R, whereby the sensitivity of
the audio signal by the built-in microphone unit 14 is desired. , And output to the processing
circuit 6. On the other hand, when processing an audio signal by the external microphone 23, the
sensitivity adjustment resistance r provided to the external microphone 23 is used as a reference
resistance instead of the sensitivity adjustment resistance r of the built-in microphone unit 14 by
the connection of the external microphone 23. The sensitivity of the audio signal from the
external microphone 23 is adjusted to the reference sensitivity and is output to the processing
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circuit 6. As a result, in the video camera 21, a correction parameter is given to the correction
circuit 25 by the sensitivity adjustment voltage by the sensitivity adjustment resistor r. When the
amplifier in the correction circuit 25 is a digital control type variable gain amplifier by register
setting, the value obtained by converting the sensitivity adjustment voltage value of the built-in
microphone unit 14 into digital data is stored in a memory or the like. By using the series circuit
as a dedicated circuit for generating the sensitivity adjustment voltage of the external
microphone 23, it is possible to implement switching of sensitivity adjustment data as a program,
and in this case, the hardware of the switching circuit can be omitted. .
[0025]
The video camera 21 is provided with a plurality of configurations from the built-in microphone
unit 14 to the processing circuit 6 as described above, thereby correcting the sensitivity of the
microphones, various directions by the built-in microphone unit 14 and / or the external
microphone 23 An audio signal from is acquired. Further, an audio signal of 5.1 channel is
generated by arithmetic processing of these audio signals, and the audio signal of 5.1 channel is
recorded on the optical disk together with the imaging result by a recording unit (not shown).
[0026]
(2) Operation of the Embodiment In the above configuration, in the video camera 21 according to
the first embodiment, audio signals from various directions are acquired by the plurality of builtin microphone units 14, and the audio signals are respectively peripheral circuits 15. After being
processed by the correction circuit 25 and the processing circuit 6, arithmetic processing is
performed to generate a 5.1 channel audio signal, and this audio signal is recorded on the optical
disk together with the imaging result.
[0027]
In the video camera 21, in each processing system related to the built-in microphone unit 14, the
sensitivity of the audio signal by the built-in microphone unit 14 is set by setting the sensitivity
adjustment resistance r for generating sensitivity adjustment voltage used for gain control of the
variable gain amplifier. The signal is adjusted and corrected to the reference sound pickup
characteristic to be converted to a 5.1 channel audio signal.
Thereby, in the video camera 21, the correction parameter P for setting the characteristic of the
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correction circuit 25 is provided by the sensitivity adjustment voltage by the sensitivity
adjustment resistor r, and the characteristic of the audio signal by the built-in microphone unit
14 is corrected to the reference characteristic and high. A 5.1 channel audio signal can be
recorded so that a sound field can be formed with a sense of reality.
[0028]
In particular, in the recording of audio signals by such multi-channels, when the microphones in
each direction have different sensitivities, the localization of the sound image is significantly
degraded, whereby the sound field is formed unnaturally. As a result, as in this embodiment, the
sensitivity of the audio signal by each built-in microphone unit 14 can be corrected, and a sound
field with high presence can be formed.
[0029]
On the other hand, for example, when a part of the built-in microphone unit is used instead of the
external microphone 23 or when all the built-in microphone units are used instead of the
external microphone 23, this video camera 21 uses this external microphone With the
connection 23, the sensitivity adjustment resistor r provided for each external microphone 23 is
connected to the reference resistor R instead of the sensitivity adjustment resistor r of the builtin microphone unit 14, and thereby the correction for the setting of the characteristic of the
correction circuit 25 The parameter P is provided by the sensitivity adjustment voltage. In the
video camera 21, the characteristics of the correction circuit 25 are thereby switched, and the
characteristics of the audio signal from the external microphone 23 are corrected to the
reference sound collection characteristics.
[0030]
As a result, in the video camera 21, the sensitivity of the external microphone 23 with respect to
the built-in microphone unit 14 is corrected, and further, the variation in sensitivity among the
external microphones 12 is corrected. Is converted to a 5.1 channel audio signal. As a result, in
the video camera 21, even with recording using the external microphone 23, an audio signal can
be easily and reliably acquired with desired sound collection characteristics, and also in this case,
an audio signal can be recorded with a high sense of reality .
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[0031]
(3) Effects of the Embodiment According to the above configuration, when recording an audio
signal from the external microphone, the characteristic of the corresponding correction circuit is
set by the correction parameter for the external microphone acquired from the external
microphone. As a result, even with recording using an external microphone, it is possible to
simply and reliably acquire and record an audio signal with a desired sound collection
characteristic.
[0032]
As a result, it is possible to flexibly cope with an external microphone or the like not planned at
the time of designing a video camera, to record an audio signal with high presence, and to readjust the correction circuit with respect to such subsequent option components. Procedures can
be omitted.
[0033]
Further, by providing the correction parameter with the voltage by the sensitivity adjustment
resistor, the sensitivity of the audio signal by the external microphone can be adjusted with a
simple configuration, and the audio signal by the external microphone can be acquired with a
desired characteristic.
[0034]
FIG. 7 is a block diagram showing a video camera according to a second embodiment of the
present invention in comparison with FIG.
In this video camera 31, the same components as those of the video camera 21 described above
with reference to FIG. 5 are indicated by the corresponding reference numerals, and the
redundant description will be omitted.
[0035]
In the video camera 31, the correction circuit 32 sets the characteristic of the audio signal
obtained from the microphone to the reference sound collection characteristic by correcting the
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sensitivity of the audio signal and the frequency characteristic, whereby the video camera
described in the first embodiment is described. Compared with 21, the characteristics of the
audio signal obtained from each microphone are more accurately corrected to create a high
realistic sound field.
The correction parameter to be used for correction is acquired from the external microphone,
and the correction parameter is acquired from the memory provided in the external microphone.
[0036]
That is, when recording an audio signal by the built-in microphone unit 14, the video camera 31
sets the correction data recorded in the memory in the register of the correction circuit 32 by a
microcomputer not shown.
[0037]
Here, as shown in FIG. 8, the correction data indicates the gain of the correction circuit 32 by the
upper 4 bits of the 8-bit data, thereby setting the sensitivity of the audio signal.
Thereby, the correction circuit 32 converts the data of the upper 4 bits set in the register into a
parameter giving a desired gain in the digital control type variable gain amplifier with the
register setting, and processes it. Correct the sensitivity.
Further, the correction data indicates the cut-off frequency of the low-pass filter for correcting
the frequency characteristic of the audio signal by the following 3 bits. As a result, the correction
circuit 32 switches the tap coefficient of the filter circuit for processing audio data according to
the subsequent 3-bit data set in the register, thereby correcting the frequency characteristic of
the audio signal. Note that FIG. 8 also describes a case where the correction data is created by 12
bits.
[0038]
As a result, the video camera 21 records and holds the correction data in the memory for each
built-in microphone unit 14, sets the characteristics of the audio signal from each built-in
microphone 14 as the reference characteristic, and scatters these built-in microphones 14.
Correct the
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[0039]
Thus, the external microphone 33 is provided with a rewritable read-only memory 35 such as an
EEPROM (Electrically Erasable Programmable Read-Only Memory), for example, and correction
data is recorded in the memory 35 in an adjustment process at the time of factory shipment. Ru.
In the video camera 31, when the connection of the external microphone 33 is detected, the
correction data recorded in the memory 35 through the interface 34 is acquired by the controller
and set in the correction circuit 32. Thus, in this embodiment, by correcting the sensitivity and
frequency characteristics of the audio signal, an audio signal having a desired characteristic is
obtained, and correction parameters relating to the setting of the sensitivity and frequency
characteristics of these audio signals are It is provided by the correction data recorded in the
memory. The correction data may be set as shown in FIG. 9 or FIG. 10 in place of FIG.
[0040]
Here, FIG. 9 is a case where the correction data is set so as to increase / decrease the sensitivity
based on the substantially central data value. Further, FIG. 10 is correction data in the case where
the characteristics of the correction circuits relating to two specific systems are set by one
correction data.
[0041]
According to this embodiment, by correcting the sensitivity of the audio signal and the frequency
characteristic, the audio signal having the desired characteristic is acquired, and the parameters
relating to the setting of the sensitivity and the frequency characteristic of the audio signal are
recorded in the memory. Even when provided by the correction data, it is possible to obtain the
same effect as that of the first embodiment.
[0042]
FIG. 11 is a block diagram showing a video camera according to a third embodiment of the
present invention in comparison with FIG.
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In this embodiment, correction data is provided from the external microphone 44 to the video
camera 41 by a two-dimensional bar code such as a QR code. The video camera 41 is configured
the same as the video camera 21 or 31 described above in the first embodiment or the second
embodiment except that the method of providing the correction data from the external
microphone 44 is different.
[0043]
For this reason, the external microphone 44 is provided with a two-dimensional bar code 45 on
the side surface, etc., and the video camera 41 displays a two-dimensional display screen for
monitoring the imaging result by control of the controller when connection of the external
microphone 44 is detected. The menu for instructing the imaging of the barcode 45 is displayed.
When the two-dimensional bar code 45 is imaged by the imaging means 46, the controller
analyzes the imaging result, decodes the correction data, and sets the correction data in the
correction circuit 32.
[0044]
As in this embodiment, even if correction data is provided by image data, the same effect as that
of the above-described embodiment can be obtained.
[0045]
FIG. 12 is a block diagram showing a video camera according to a fourth embodiment of the
present invention in comparison with FIG.
In this embodiment, the IC tag 55 records and holds correction data on the external microphone
54. The configuration is the same as that of the video camera 21 or 31 described above in the
first embodiment or the second embodiment except that the configuration of the correction data
is different depending on the IC tag 55.
[0046]
Thus, in the video camera 51, a controller for controlling the entire operation is recorded in the
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IC tag 55 under the control of the reader 56 which is a wireless communication unit with the IC
tag 55 when the connection of the external microphone 54 is detected. The correction data is
acquired, and this correction data is set in the correction circuit 32.
[0047]
As in this embodiment, the correction data of the external microphone is held in the IC tag, and
even if the correction parameter is acquired by data communication with the wireless
communication unit by this IC tag, the second embodiment can be realized. The same effect can
be obtained.
[0048]
13 is a block diagram showing a video camera according to a fifth embodiment of the present
invention in comparison with FIG.
In this embodiment, the audio signal of the external microphone 64 is input to the video camera
61 by wireless communication such as Bluetooth, and the correction data of the external
microphone 64 is notified to the video camera 61 by wireless communication.
[0049]
Therefore, the external microphone 64 includes an analog-to-digital conversion circuit that
converts the audio signal acquired by the microphone unit 3 into analog-digital conversion and
outputs audio data, a memory 66 that records and holds correction data, audio data and
correction A communication unit 65 for sending out data for communication is provided.
[0050]
Further, the video camera 61 is provided with a communication unit 67 for receiving audio data
and correction data from the external microphone 64, and the correction circuit 68 thereby
makes the audio signal from the external microphone 64 into data for correction. The sensitivity
is corrected by multiplication processing with a corresponding coefficient.
[0051]
Even when audio data is provided to the video camera by wireless communication as in this
embodiment and the correction data is notified by this wireless communication, the same effect
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as that of the above-described embodiment can be obtained.
[0052]
In the above embodiment, the sensitivity is described in the first embodiment, and the sensitivity
and frequency characteristics are corrected in the second to fourth embodiments. However, the
present invention is not limited to this and is widely applied to correction of various
characteristics. can do.
[0053]
In the above-described embodiment, the case where four channels of audio signals are acquired
and recorded by 5.1 channels has been described, but the present invention is not limited to this,
and when acquiring audio signals by various channel numbers, Furthermore, the present
invention can be widely applied to the case of recording an audio signal with various channel
numbers.
[0054]
In the above embodiments, the present invention is applied to a video camera to record an audio
signal on an optical disk together with an imaging result. However, the present invention is not
limited to this and various types of memory cards, magnetic disks, etc. The present invention can
be widely applied to the case of recording on a recording medium, and further in the case of
recording only an audio signal on a recording medium.
[0055]
The present invention relates to a recording apparatus and an adjustment method of the
recording apparatus, and can be applied to, for example, a portable video camera which records
an imaging result on an optical disk.
[0056]
FIG. 1 is a block diagram showing the configuration of a video camera used to explain the basic
configuration of the present invention.
FIG. 2 is a block diagram illustrating the connection of an external microphone to the video
camera of FIG. 1;
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FIG. 5 is a block diagram for describing correction parameters related to the external microphone
of FIG. 2;
FIG. 6 is a block diagram for explaining characteristic correction of an audio signal by the
correction parameters of FIG. 3;
FIG. 1 is a block diagram showing a video camera according to a first embodiment of the present
invention.
5 is a table for describing correction parameters according to the video camera of FIG. 4;
It is a block diagram which shows the video camera concerning Example 2 of this invention.
5 is a table for describing correction parameters according to the video camera of FIG. 4;
FIG. 9 is a table for describing another example of the correction parameter of FIG. 8; FIG. 11 is a
table for describing another example of the correction parameters of FIGS. 8 and 10; FIG. It is a
block diagram showing the video camera concerning Example 3 of the present invention. It is a
block diagram which shows the video camera concerning Example 4 of this invention. It is a
block diagram which shows the video camera concerning Example 5 of this invention. FIG. 6 is a
block diagram for explaining adjustment of an external microphone. FIG. 15 is a block diagram
for explaining an audio signal according to the adjustment of FIG. 14;
Explanation of sign
[0057]
1, 11, 21, 31, 31, 41, 51, 61 ... video camera, 2, 12, 23, 33, 44, 54, 64 ... external microphone, 3
... microphone unit, 4, 15 ... peripheral circuit, 5, 25, 32, 68 ... correction circuit, 6 ... processing
circuit, 13 ... correction parameter, 14 ... built-in microphone unit, 18 ... test apparatus, 35, 66 ...
memory, 55 ... IC tag , 65, 67 ...... Communications department
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