Recording device and adjustment method of audio input signals of the recording device

Recording device and method for adjusting the recording device

The present invention relates to a recording device and a method for adjusting the recording device, for example, it is suitable for a portable video camera that records the imaging results on a disc. In the present invention, when recording the sound signal corresponding to the external microphone, the characteristics of the correction circuit are set by the correction parameters for the external microphone obtained by the external microphone, and thereby, even if the recording with the external microphone is used, It is easy and reliable to obtain and record the sound signal with the desired radio characteristics.

Previously, portable video cameras that recorded the results and audio signals on the optical disc provided the audio signal obtained by the built-in microphone to be recorded on the optical disc through 5.1-channel multi-channels.

A video camera like this uses a plurality of microphones to obtain sound signals from various directions, and through the calculation and processing of these sound signals, a 5.1-channel sound signal is generated. In addition, the characteristics of each microphone and the characteristics of the signal processing circuit that processes the sound signals of each microphone are adjusted at the time of shipment from the factory. By this, the radio characteristics of the sound signals obtained by each microphone are set as the reference radio characteristics. It is set to create a 5.1-channel sound field with a high sense of presence. In addition, the radio characteristics here refer to the various characteristics of the sound signal that will affect the creation of the multi-channel sound field, such as directivity, frequency, sensitivity and other characteristics.

Here, the adjustment in the factory refers to obtaining the necessary characteristics for correction based on the radio characteristics of the sound signal output by the microphone beforehand, and generally setting the characteristics in order to ensure the characteristics necessary for the correction The correction circuit setting correction parameters of the signal processing circuit, or the program setting correction parameters used in the circuit adjustment. As a result, this type of video camera sets the radio characteristics of the sound signals from each microphone as the reference radio characteristics, and corrects the errors of each microphone.

Regarding the modification of the characteristics of this microphone, for example, there are various proposals in Japanese Patent Laid-Open No. 6-292293, etc.

However, in this type of video camera, instead of the built-in microphone, there are cases where the external microphone desired by the user is used to record the audio signal. However, the characteristics of this type of external microphone are often different from those of the built-in microphone. As a result, only using an external microphone instead of the built-in microphone to obtain the audio signal will cause the problem of not being able to obtain the audio signal with the desired radio characteristics. Therefore, it becomes difficult to record the audio signal through a sound field with a high sense of presence. As a result, the use of external microphones is restricted.

As a way to solve this problem, consider adjusting the video camera corresponding 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 a specific characteristic adjustment position, and the reference signal is reproduced by the sound source S and the external microphone 2 Come on. Here, the external microphone 2 is composed of a microphone unit (M1) 3 that is a mechanical-electrical converter that converts changes in sound pressure into a sound signal, and a peripheral circuit (M1) that amplifies the sound signal output from the microphone unit 3, etc. A1) constituted by 4. In addition, according to the type of the microphone unit 3, a driving circuit for driving the microphone unit 3 is further provided in the peripheral circuit 4. In contrast, the video camera 1 is provided with a correction circuit 5 that corrects the characteristics of the sound signal output by the external microphone 2 and a signal processing circuit ( D) 6 and so on. In this adjustment, the sound signal S1 output by the signal processing circuit 6 becomes the expected sound reception characteristic. Generally, the characteristic (C1) of the correction circuit 5 is set. In addition, the correction circuit 5 is composed of an amplifier circuit that amplifies the sound signal, an analog-digital conversion circuit that outputs sound data by analog-digital conversion processing of the sound signal, and a filter circuit that sets the frequency characteristics of the sound data. The signal processing circuit 6 performs calculation processing between the sound signals obtained from other microphones, and sets the directivity of the sound signal to the desired directivity.

As a result, as shown in FIG. 15, when the external microphone 2 is used, it is also possible to obtain a sound signal with the desired sound reception characteristics, thereby forming a sound field with a high sense of presence.

However, in this case, it takes time to adjust, and depending on the user, there may be cases where such adjustment cannot be performed. In addition, although there is also a method of arranging such an adjustment mechanism on the side of the external microphone, there are similar disadvantages in this case.

[Patent Document 1] Japanese Patent Application Publication No. 6-292293

<p>The present invention is based on the above considerations, and provides a recording device and a recording device adjustment method that can easily and reliably obtain and record sound signals with the desired radio characteristics when recording with an external microphone.</p>

<p>The invention in the scope of patent application 1 to solve this problem is applicable to a recording device that acquires sound signals by a plurality of microphones and records them on a recording medium, and is equipped with: a plurality of built-in microphones that output the aforementioned sound signals; and by The above-mentioned built-in microphone is used for the correction parameter to switch characteristics, the characteristic of the sound signal corresponding to the above-mentioned built-in microphone is corrected to the reference characteristic and the correction circuit is output; and the said sound signal output by the said correction circuit is recorded in The recording means of the aforementioned recording medium and the aforementioned correction circuit are when instead of all the sound signals or part of the sound signals of the aforementioned plural built-in microphones, the sound signals of the external microphones are input into the aforementioned correction circuit and recorded on the aforementioned recording medium. By using the correction parameters for the external microphone obtained by the external microphone, the characteristics of the corresponding correction circuit are set, and the sound signal of the external microphone is corrected to the characteristics of the reference and output.</p><p>In addition, the invention in the scope of patent application 6 is an adjustment method suitable for a recording device that obtains sound signals by a plurality of microphones and records them on a recording medium. The recording device is provided with: a plurality of built-in microphones that output the sound signals; and The characteristics are switched by the correction parameters for the aforementioned built-in microphone, and the characteristics of the sound signal corresponding to the aforementioned built-in microphone are corrected to the reference characteristics and output correction circuit; and the aforementioned sound signal output by the aforementioned correction circuit, The recording means recorded on the aforementioned recording medium, and the aforementioned adjustment method is to replace all the sound signals or part of the sound signals of the aforementioned plural built-in microphones, and input the sound signals of the external microphones into the aforementioned correction circuit and record them in the aforementioned record. For media, use the correction parameters for the external microphone obtained by the external microphone to set the characteristics of the corresponding correction circuit, correct the sound signal of the external microphone to the characteristics of the aforementioned reference, and record it on the recording medium .</p><p>With the composition of the scope of patent application 1, it is suitable for a recording device that acquires sound signals by a plurality of microphones and records them on a recording medium, and is equipped with: a plurality of built-in microphones that output the aforementioned sound signals; and used by the aforementioned built-in microphones The correction uses parameters to switch the characteristics, and corrects the characteristics of the sound signal corresponding to the aforementioned built-in microphone to the reference characteristics and outputs the correction circuit; and records the aforementioned sound signal output by the aforementioned correction circuit on the recording medium Means, the aforementioned correction circuit, when replacing all the sound signals or part of the sound signals of the aforementioned plural built-in microphones, and inputting the sound signals of the external microphones into the aforementioned correction circuit and recording them on the aforementioned recording medium, if it is used by The correction parameters for the external microphone obtained by the aforementioned external microphone are used to set the characteristics of the corresponding correction circuit, and the sound signal of the aforementioned external microphone is corrected to the characteristics of the aforementioned reference and output, even if there is a sound signal corresponding to the external microphone , You can also set its characteristics as the reference characteristics and record. In addition, setting the characteristic as the reference characteristic setting here can be set simply and surely. By this, in the case of using an external microphone, it is also possible to obtain and record the sound signal simply and reliably with the desired sound reception characteristics.</p><p>In addition, with this, if the composition of the patent scope 6 is applied, it is possible to provide a recording device and a recording device that can easily and reliably obtain and record sound signals with the desired radio characteristics even when an external microphone is used. How to adjust the device.</p>

<p>With the present invention, even when recording with an external microphone, it is possible to obtain and record sound signals simply and reliably with the desired radio characteristics.</p>

Hereinafter, it is appropriate to refer to the drawings and describe the present invention in detail.

[Example 1]

(1) The composition of the embodiment

Fig. 1 is a block diagram of an image camera for explaining the principle of the present invention. The image camera 11 is adapted to the external microphone 12, and the correction parameter (P) 13 set in the external microphone 12 is used to set the characteristics of the correction circuit 5.

As a result, the video camera 11, as shown in FIG. 2, when the built-in microphone is used, corresponds to the audio signal of the built-in microphone unit 14 provided in the video camera 11, and is used by the built-in microphone. After processing by the peripheral circuit 15, the characteristic (C0) for the built-in microphone is corrected by the correction circuit 5 and set as the reference sound reception 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) of the correction parameter (P) 13, and the sound signal obtained by the external microphone 12 has this characteristic The radio characteristics that are corrected and set as the reference are processed by the processing circuit 6.

Here, by comparison with FIG. 14, as shown in FIG. 3, the external microphone 12, which is connected to the test device 18 for characteristic adjustment during the adjustment operation at the time of shipment from the factory, will correspond to the reference of the sound source S The audio signal of the signal is output to the test device 18. Here, the test device 18 is provided with a correction circuit 5 and a processing circuit 6 set by the standard of the video camera 11. In this adjustment operation, the audio signal S1 output by the processing circuit 6 becomes the reference radio Characteristics Generally, to adjust the characteristic C1 of the correction circuit 5, the correction parameter (P) 13 that sets the characteristic of the correction circuit 5 to the characteristic C1 is set to the external microphone 12.

As a result, as shown in FIG. 4, in the video camera 11, the sound reception characteristics of the sound signal corresponding to the external microphone 12 can be obtained and processed by the same sound reception characteristics as the sound signal corresponding to the built-in microphone. In this way, a sound field with a high sense of presence can be formed to record the sound signal.

Fig. 5 is a block diagram showing the specific structure of the image camera of the first embodiment. The image camera 21 is a correction parameter P used for the external microphone, which is obtained by the voltage value.

That is, in this video camera 21, the correction circuit 25 corrects the sensitivity of the audio signal through an amplifier and outputs it to the processing circuit 6. This amplifier is a DC voltage-controlled variable gain amplifier, which corresponds to the sensitivity adjustment voltage value generated by the impedance divider of the series impedance circuit, changes its amplification rate, and thereby adjusts the sensitivity of the sound signal. Or, 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 set by a register, it can also be used by The microcomputer, not shown in the figure, will use the sensitivity adjustment voltage value generated by the impedance divider corresponding to the series impedance circuit to perform analog-digital conversion, and the digitized sensitivity adjustment voltage data will be given corresponding gain parameters The structure of writing the value into the register.

The correction circuit 25 is formed by dividing the sensitivity adjustment voltage input at one end of the series impedance circuit by the impedance division voltage of the reference impedance R connected to the reference voltage Vpp and the sensitivity adjustment impedance r connected to the reference impedance. With this, as shown in Figure 6. It is generally configured to adjust the sensitivity through the setting of the sensitivity adjustment impedance r. In addition, in this Figure 6, the analog-to-digital conversion processing result (AD output) shows that when a specific reference voltage is input to the analog-to-digital conversion circuit, the 8-bit and 12-bit analog-to-digital conversion processing results are borrowed It can be seen that by increasing the ratio of the sensitivity adjustment impedance r to the reference impedance R, the sensitivity is increased.

The correction circuit 25 is used for processing the sound signal corresponding to the built-in microphone unit 14 and processing the sound signal corresponding to the external microphone 23, switching this sensitivity to adjust the impedance r. In addition, in the case of processing the sound signal corresponding to the built-in microphone unit 14, the sensitivity adjustment impedance r corresponding to the sensitivity of the built-in microphone unit 14 is connected to the reference impedance R, thereby corresponding to the built-in microphone The sensitivity of the sound signal of the unit 14 is adjusted to the desired reference sensitivity and output to the processing circuit 6. In contrast, when processing the sound signal corresponding to the external microphone 23, the external microphone 23 is connected to replace the sensitivity adjustment impedance r of the built-in microphone unit 14, and the sensitivity adjustment impedance r of the external microphone 23 is set. Connected to the reference impedance R, by this, the sensitivity of the sound signal corresponding to the external microphone 23 is adjusted to the reference sensitivity and output to the processing circuit 6. As a result, the video camera 21 provides the correction parameters to the correction circuit 25 by the sensitivity adjustment voltage corresponding to the sensitivity adjustment impedance r. In addition, when the amplifier in the correction circuit 25 is a digital control type variable gain amplifier set by a register, it is stored in a memory, etc., and the sensitivity adjustment voltage value of the built-in microphone unit 14 is converted into a digital value. For the value of the data, by using the series impedance circuit as a dedicated circuit for generating the sensitivity adjustment voltage of the external microphone 23, the switching of the sensitivity adjustment data can be implemented as a program. In this case, the hardware of the switching circuit can be omitted.

This video camera 21 is composed of the built-in microphone unit 14 to the processing circuit 6 and is provided with plural numbers in a unified manner. By this, the sensitivity of the microphone is corrected. The built-in microphone unit 14 and the external microphone 23 Acquire sound signals in various directions. Furthermore, through the calculation and processing of these audio signals, a 5.1-channel audio signal is generated, and the 5.1-channel audio signal is recorded together with the camera result on the optical disc by a recording unit not shown.

(2) The actions of the embodiment

In the above configuration, the video camera 21 of this embodiment 1 uses a plurality of built-in microphone units 14 to obtain sound signals from various directions, and the sound signals are passed through the peripheral circuit 15, the correction circuit 25, and the processing circuit, respectively. After 6 processing, a 5.1-channel audio signal is generated by calculation and processing, and the audio result and the camera result are recorded on the disc together.

The image camera 21, in each processing system related to the built-in microphone unit 14, will correspond to the sensitivity of the sound signal of the built-in microphone unit 14, by being used to generate the sensitivity for gain control of the variable gain amplifier The sensitivity of the adjustment voltage is adjusted to adjust the setting of the impedance r, and by this, the radio characteristic of the reference is corrected and converted into a 5.1-channel sound signal. By this, the video camera 21 is provided with the correction parameter P for setting the characteristics of the correction circuit 25 by adjusting the sensitivity adjustment voltage of the impedance r by the sensitivity adjustment, and is corrected corresponding to the characteristics of the sound signal of the built-in microphone unit 14 As a reference feature, it can record 5.1-channel sound signals that can form a high-presence sound field.

In particular, in this type of recording by multi-channel sound signals, when the sensitivity of the microphones in each direction is different from each other, the sound image positioning will be significantly deteriorated, and thereby, the sound field will be unnaturally formed. Therefore, such an embodiment generally corrects the sensitivity of the sound signal corresponding to each built-in microphone unit 14 to form a sound field with a high sense of presence.

In contrast to this, for example, in the case of replacing a part of the built-in microphone unit with the external microphone 23, and further, in the case of replacing all the built-in microphone units with the external microphone 23, the image camera 21 is With this connection of the external microphone 23, the sensitivity adjustment impedance r provided in each external microphone 23 replaces the sensitivity adjustment impedance r of the built-in microphone unit 14 and is connected to the reference impedance R. Thus, the correction circuit 25 The parameter P for the correction of the characteristic setting is provided by the sensitivity adjustment voltage. The video camera 21 switches the characteristics of the correction circuit 25 by this, and corrects the characteristics of the sound signal corresponding to the external microphone 23 as the reference sound reception characteristics.

As a result, in this image camera 21, the sensitivity of the external microphone 23 with respect to the built-in microphone unit 14 is corrected, and furthermore, the deviation of the sensitivity between the external microphones 23 is corrected, and the desired radio characteristics will correspond to The sound signal of the external microphone 23 is converted into a 5.1-channel sound signal. As a result, in the video camera 21, even if the external microphone 23 is used for recording, the sound signal can be easily and reliably obtained by the desired sound reception characteristics, and in this case, the sound signal can also be recorded with a high sense of presence.

(3) The effect of the embodiment

With the above configuration, in the case of recording the sound signal corresponding to the external microphone, the characteristics of the corresponding correction circuit can be set by using the correction parameters for the external microphone obtained by the external microphone. The microphone recording can also easily and reliably obtain and record the sound signal with the desired radio characteristics.

With this, it is possible to softly correspond to the external microphones that are not predetermined during the design of the video camera and record high-presence sound signals, and it is possible to omit re-adjustment of the correction circuit for such subsequent selection components. Formalities.

In addition, by providing the correction parameter with the voltage corresponding to the sensitivity adjustment resistor, the sensitivity of the sound signal corresponding to the external microphone can be adjusted by a simple configuration, and the sound signal of the external microphone can be adjusted to the desired value Characteristics to obtain.

[Example 2]

FIG. 7 is a block diagram showing the image camera of Embodiment 2 of the present invention by comparing with FIG. 5. In this video camera 31, the same configuration as the video camera described above with respect to FIG. 5 is attached and shown with corresponding symbols, and repeated descriptions are omitted.

In this video camera 31, the correction circuit 32 corrects the sensitivity and frequency characteristics of the sound signal, and sets the characteristics of the sound signal obtained by the microphone as the reference sound reception characteristics. Therefore, compared with the embodiment The video camera 21 described in 1 can more accurately correct the characteristics of the sound signal obtained by each microphone, and create a sound field with a high sense of presence. In addition, the correction parameter for correction is obtained by an external microphone. Generally, the correction parameter is obtained by the memory provided in the external microphone.

That is, when the video camera 31 records the sound signal corresponding to the built-in microphone unit 14, the correction data recorded in the memory is set in the correction circuit 32 by a microcomputer not shown. Memory.

Here, the correction data, as shown in FIG. 8, indicates the gain of the correction circuit 32 by corresponding to the upper 4 bits of the 8-bit data, and thereby sets the sensitivity of the sound signal. With this, the correction circuit 32 transforms the 4-bit data set on the upper side of the register into a digitally controlled variable gain amplifier based on the setting of the register. The desired gain parameters are processed and processed to correct the sensitivity of the sound signal. In addition, the correction data indicates the cut-off frequency of the low-pass filter that corrects the frequency characteristics of the audio signal by the subsequent 3-bit data. With this, the correction circuit 32 switches the tap coefficient of the filter circuit for processing the audio signal by using the subsequent 3-bit data set in the register, and thereby corrects the audio signal. Frequency characteristics. In addition, in FIG. 8, it is also described that this correction data is made with 12 bits.

By this, the video camera 21 is in each built-in microphone unit 14, memorizes and maintains the correction data in the memory, and sets the characteristics corresponding to the sound signal of each built-in microphone 14 as the reference characteristics, Correct the deviation of these built-in microphones 14.

The external microphone 33 is thus provided with a read-only memory 35 corresponding to replaceable write-in such as EEPROM (Electrically Erasable Programmable Read-Only Memory), etc., which will be corrected in the adjustment process at the time of factory shipment Use data are recorded in this memory 35. In the video camera 31, when the connection of the external microphone 33 is detected, the correction data recorded in the memory 35 is obtained by the controller via the interface 34 and set in the correction circuit 32. As a result, in this embodiment, by modifying the sensitivity and frequency characteristics of the sound signal, it is possible to obtain the sound signal corresponding to the desired characteristics, and there will be settings regarding the sensitivity and frequency characteristics of these sound signals. The correction data of is provided by the correction data recorded in the memory. In addition, instead of FIG. 8, this correction data can also be set as shown in FIG. 9 or FIG. 10.

In addition, here, FIG. 9 is a case where the correction data is set by using the almost center data value as a reference to increase or decrease the sensitivity. In addition, FIG. 10 is the correction data for the case where the characteristics of the correction circuit belonging to the two specific systems are set with one correction data.

With this embodiment, by correcting the sensitivity and frequency characteristics of the sound signal, it becomes possible to obtain the sound signal corresponding to the desired characteristics, even if there will be parameters for the sensitivity and frequency characteristics of these sound signals. By providing the correction data recorded in the memory, the same effect as the first embodiment can also be obtained.

[Example 3]

FIG. 11 is a block diagram showing the image camera according to the third embodiment of the present invention by comparison with FIG. 7. In this embodiment, the external microphone 44 provides correction data to the image camera 41 by a two-dimensional bar code corresponding to a QR code or the like. This image camera 41 has the same structure as the above-mentioned image camera 21 or 31 in Embodiment 1 or Embodiment 2 except for the difference in the method of providing correction data provided by the external microphone 44.

Therefore, the external microphone 44 is provided with a two-dimensional barcode 45 on the side, etc., and the video camera 41, when the connection of the external microphone 44 is detected, is controlled by the controller to display the instruction pair on the display screen of the monitoring camera result The 2D barcode 45 is used as the camera menu. In addition, after the two-dimensional barcode 45 is captured by the imaging means 46, the controller analyzes the imaging result as an image and decodes it back to the correction data, and sets the correction data in the correction circuit 32.

In this embodiment, even if the correction data is provided by the image data, the same effect as the above-mentioned embodiment can be obtained.

[Example 4]

FIG. 12 is a block diagram showing the image camera of Embodiment 4 of the present invention by comparison with FIG. 7. In this embodiment, the IC tag 55 is used to record and hold the correction data in the external microphone 54. In addition, except for this difference in the configuration of the correction data by the IC tag 55, the configuration is the same as that of the above-mentioned image camera 21 or 31 in the first embodiment or the second embodiment.

As a result, in this video camera 51, the controller that controls the overall operation is to control the reader 56 as the wireless communication unit with the IC tag 55 when the connection of the external microphone 54 is detected, and obtain The correction data recorded in the IC tag 55 is set to the correction circuit 32.

In this embodiment, generally, the correction data of the external microphone is stored in the IC tag, even if the correction parameters are obtained through data communication with the wireless communication unit corresponding to the IC tag, the same as in the second embodiment can be obtained. Effect.

[Example 5]

FIG. 13 is a block diagram showing the image camera of Embodiment 5 of the present invention by comparison with FIG. 7. In this embodiment, the audio signal of the external microphone 64 is input to the video camera 61 through wireless communication such as Bluetooth, and the correction data of the external microphone 64 is notified to the video camera 61 through this wireless communication. .

Therefore, the external microphone 64 is provided with: an analog-digital conversion circuit for processing the audio signal obtained by the microphone unit 3 by analog-digital conversion and outputting the audio signal; and a memory 66 for recording and storing correction data; and sending it out The communication section 65 for audio data and correction data.

In addition, the video camera 61 is provided with a communication unit 67 that receives the audio signal and correction data from the external microphone 64, and the correction circuit 68 is adapted to respond to the external microphone. The correction of the sound signal from 64 is processed by multiplying the coefficient of the data to correct the sensitivity.

Generally, in such an embodiment, if the audio data is provided to the video camera by wireless communication, even if the correction data is notified by the wireless communication, the same effect as the above-mentioned embodiment can be obtained.

[Example 6]

In addition, in the above-mentioned embodiments, the correction sensitivity is described in the first embodiment, and the correction sensitivity and frequency characteristics are described in the embodiments 2 to 4. However, the present invention is not limited to this, and can be widely applied. Modifications to various characteristics.

In addition, in the above-mentioned embodiment, although the case where a 4-channel audio signal is obtained and recorded by 5.1 channels is described, the present invention is not limited to this, and can be widely applied to various types of audio signals. The situation where the sound signal is obtained by the number of channels is further applicable to the situation where the sound signal is recorded by the number of channels.

In addition, in the above-mentioned embodiments, although the case where the present invention is applied to a video camera and the audio signal and the imaging result are recorded together on an optical disc is explained, the present invention is not limited to this, but can be widely applied Recording on various recording media such as memory cards, magnetic discs, etc., can be widely applied to situations where only audio signals are recorded on the recording media.

[Industrial Utilization Possibility]

The present invention relates to a recording device and a method for adjusting the recording device. For example, it can be applied to a portable video camera that records the imaging results on an optical disc.

<p>1, 11, 21, 31, 41, 51, 61. . . Video camera</p><p>2, 12, 23, 33, 44, 54, 64. . . External microphone</p><p>3. . . Microphone unit</p><p>4. 15. . . Peripheral circuit</p><p>5. 25, 32, 68. . . Correction circuit</p><p>6. . . Processing circuit</p><p>13. . . Correction parameters</p><p>14. . . Built-in microphone unit</p><p>18. . . Test device</p><p>35, 66. . . Memory</p><p>55. . . IC label</p><p>65, 67. . . Ministry of Communications</p>

[FIG. 1] FIG. 1 is a block diagram showing the structure of a display image camera for explaining the principle structure of the present invention.

[Fig. 2] Fig. 2 is a block diagram showing the connection of an external microphone to the image camera of Fig. 1.

[Fig. 3] Fig. 3 is a block diagram for explaining the correction parameters of the external microphone of Fig. 2.

[FIG. 4] FIG. 4 is a block diagram for explaining the correction of sound signal characteristics corresponding to the correction parameters of FIG. 3.

[Fig. 5] A block diagram showing the image camera of Embodiment 1 of the present invention.

[Fig. 6] A chart for explaining the correction parameters of the image camera in Fig. 4.

[Fig. 7] A block diagram showing the image camera according to the second embodiment of the present invention.

[Fig. 8] A chart for explaining the correction parameters of the image camera in Fig. 4.

[Fig. 9] A graph for explaining other examples of the correction parameters of Fig. 8.

[Fig. 10] A graph for explaining other examples of the correction parameters in Fig. 8 and Fig. 10.

[Fig. 11] A block diagram showing the image camera of the third embodiment of the present invention.

[Fig. 12] A block diagram showing the image camera of Embodiment 4 of the present invention.

[FIG. 13] A block diagram showing the image camera of Embodiment 5 of the present invention.

[Figure 14] A block diagram for explaining the adjustment of the external microphone.

[Fig. 15] A block diagram for explaining the adjusted sound signal corresponding to Fig. 14.