JP2011077636A - Video recording device and video recording system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video recording device which can extract and record a characteristic video among videos to be acquired by an imaging apparatus. <P>SOLUTION: The video recording device includes: an audio decision means; a volume level decision means; and a recording control means. The audio decision means analyzes the output signal of a microphone to determine whether the audio signal of a person is included in the output signal. The volume level decision means determines whether the volume level of the output signal is larger than a reference level on the basis of the output signal of the microphone. The recording control means records a video signal to be output from the imaging apparatus in a storage medium when it is determined that the audio signal of the person is included in the output signal of the microphone by the audio decision means and it is determined that the volume level of the output signal is larger than the reference level by the volume level decision means. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a recording apparatus capable of recording an image acquired by an imaging apparatus, such as a drive recorder, and a recording system including the recording apparatus.

  2. Description of the Related Art Conventionally, a recording device such as a drive recorder is mounted on an automobile in which an impact detection sensor is installed, and temporarily records a video signal output from an imaging device during movement of the automobile in a buffer, so that an accident or sudden occurrence occurs. When an impact detection sensor detects an impact on the automobile caused by a slow deceleration or the like, video signals before and after the detection are read from the buffer and recorded in the nonvolatile memory.

  In recent years, it has been considered to use the recording apparatus for recording moving scenery. However, when a moving landscape is simply recorded using the recording device, all video signals output from the imaging device are recorded in the nonvolatile memory. Therefore, it is necessary to prepare a large capacity memory as the nonvolatile memory. In addition, it takes a lot of time and effort to edit the recorded video after shooting.

  Therefore, a recording apparatus has been proposed in which a video to be recorded is registered in advance, and a video signal including the video is extracted and recorded in a nonvolatile memory (see Patent Document 1).

JP 2004-207842 A

  However, in the recording apparatus disclosed in Patent Document 1, it is necessary to register in advance a video to be recorded. For this reason, video of a subject to be recorded, for example, a video of a person, a landscape, a sign, etc., must be acquired in advance, and this is characteristic of a subject that could not be acquired as a video or was not acquired. Even if there is, there is a problem that cannot be recorded.

  In addition, in order to determine whether or not the video signal output from the imaging device includes a pre-registered video, complicated video analysis is required. Furthermore, in order to acquire a video signal including a pre-registered video, it is necessary to always change the shooting direction of the imaging device.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a recording apparatus capable of extracting and recording a characteristic image from among images acquired by an imaging device, and a recording system including the same.

  The recording device according to the present invention is connected to or mounted with a microphone, an imaging device, and a storage medium, and can record the output signal of the microphone and the video signal output from the imaging device on the storage medium. It is. Here, the recording apparatus includes an audio determination unit, a volume level determination unit, and a recording control unit. The voice determination unit analyzes the output signal of the microphone and determines whether or not the output signal includes a human voice signal. The volume level determination means determines whether or not the volume level of the output signal is greater than the reference level based on the output signal of the microphone. The recording control unit determines that the voice determination unit determines that the output signal of the microphone includes a human voice signal and the volume level determination unit determines that the volume level of the output signal is greater than the reference level. The video signal output from the imaging device is recorded in a storage medium, and it is determined by the audio determination unit that the human output signal is not included in the output signal of the microphone, or the volume of the output signal is determined by the volume level determination unit When it is determined that the level is not greater than the reference level, recording of the video signal output from the imaging device on the storage medium is stopped.

  When a change occurs in the shooting target of the image pickup device and a cheer occurs around the recording device, the output signal of the microphone includes a human voice signal, and the volume level of the output signal becomes higher than the reference level. Here, the reference level is set to a level between a volume level when a person is talking and a volume level when a cheer occurs. Therefore, in the recording apparatus, it is determined by the sound determination unit that the human output signal is included in the output signal of the microphone, and the volume level of the output signal is determined by the volume level determination unit to be greater than the reference level. As a result, recording by the recording device is executed.

  On the other hand, when there is almost no change in the shooting target of the imaging device and no cheering occurs around the recording device, the microphone output signal does not include a human voice signal, or the microphone output signal does not include a human voice signal. Even if an audio signal is included, the volume level of the output signal is smaller than the reference level. Therefore, in the recording apparatus, it is determined by the sound determination means that the output signal of the microphone does not contain a human sound signal, or the sound volume level determination means determines that the volume level of the output signal is not greater than the reference level. As a result, recording by the recording device is stopped.

  In the specific configuration of the recording apparatus, the sound determination unit includes a calculation unit and a change point number determination unit. Based on the output signal of the microphone, the calculating means calculates a change amount with respect to time of the power value of the output signal. The change point number determination means determines whether or not the number of change points that are maximal values that exist within a predetermined time width and are greater than the predetermined value among the change amounts calculated by the calculation means is greater than the predetermined number. Then, when the change point determination unit determines that the number of change points is larger than a predetermined number, the sound determination unit determines that a human voice signal is included in the output signal of the microphone, and the change point number When it is determined by the determination means that the number of change points is not greater than the predetermined number, it is determined that a human voice signal is not included in the output signal of the microphone.

In another specific configuration of the recording apparatus, the recording apparatus includes a first buffer in which a video signal output from the imaging apparatus is temporarily recorded and a second buffer in which a microphone output signal is temporarily recorded. The sound determination means analyzes the output signal recorded in the second buffer to determine whether or not a human sound signal is included in the output signal, and the volume level. The determination means determines whether the volume level of the output signal is greater than a reference level based on the output signal recorded in the second buffer. The recording control means is determined by the voice determination means to include a human voice signal in the microphone output signal, and the volume level determination means determines that the volume level of the output signal is greater than a reference level. Then, the video signal recorded in the first buffer and the output signal recorded in the second buffer are associated with each other and recorded on the storage medium.
According to the specific configuration, the video when the cheering occurs is recorded together with the sound.

  The recording system according to the present invention includes the recording device, an imaging device connected to or mounted on the recording device, a microphone connected to or mounted on the recording device, and a storage medium connected to or mounted on the recording device. It has.

In the specific configuration of the recording system, the recording system further includes posture changing means connected to the recording device and installed on a moving body to change the posture of the imaging device. The recording control unit of the recording apparatus determines that the human output signal is included in the output signal of the microphone by the sound determination unit of the recording apparatus, and the volume of the output signal by the volume level determination unit of the recording apparatus. When it is determined that the level is greater than the reference level, the image change device is controlled to direct the image pickup device into the moving body, and the video signal output from the image pickup device is recorded in a storage medium for a predetermined time, and thereafter Then, by controlling the posture changing means, the imaging device is directed outside the moving body, and the video signal output from the imaging device is recorded on the storage medium.
According to the specific configuration, when a shooting target outside the moving body of the imaging apparatus changes and a cheering occurs in the moving body, an image of the passenger raising the cheering in the moving body is recorded for a predetermined time. Thereafter, the video to be photographed outside the moving body is recorded.

  The recording device and the recording system according to the present invention can extract and record a characteristic video among the videos acquired by the imaging device.

FIG. 1 is a block diagram showing a configuration of a recording system including a drive recorder according to an embodiment of the present invention. FIG. 2 is a block diagram illustrating a configuration of the voice analysis unit. FIG. 3 is a diagram illustrating a waveform of an analog output signal of the microphone. FIG. 4 is a diagram illustrating a waveform of the change amount of the power value. FIG. 5 is a flowchart showing a recording control procedure executed by the control circuit. FIG. 6 is a flowchart showing a modification of the recording control procedure.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a recording apparatus according to the present invention implemented in a drive recorder mounted on an automobile will be specifically described below with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a recording system including a drive recorder according to an embodiment of the present invention. As shown in FIG. 1, the drive recorder (2) is connected to a pan head (3) installed in the car and a camera (1) attached to the pan head (3). A recording system is built in the car. Here, the camera platform (3) has a posture of the camera (1) between a first posture in which the camera (1) faces the inside of the vehicle and a second posture in which the camera (1) faces the outside of the vehicle. It can be changed selectively. For example, the posture in which the camera (1) faces the front of the automobile can be set as the second posture of the camera (1).

  As shown in FIG. 1, the drive recorder (2) is provided with a control circuit (5) for controlling the operation of the drive recorder (2). The control circuit (5) is a CPU (Central Processing Unit). (51), RAM (Random Access Memory) (52), and ROM (Read Only Memory) (53). Here, the operation of the drive recorder (2) includes a recording operation in which an analog video signal output from the camera (1) is converted into a digital video signal and recorded on a recording medium (21) or a memory card (22). included.

  The control circuit (5) is connected to a bus (201) disposed in the drive recorder (2), and an analog video signal from the camera (1) is input to the bus (201). A video input unit (23) for converting a video signal into a digital video signal, a video buffer (24) for temporarily recording a digital video signal output from the video input unit (23), and the video buffer (24 ) Are connected to an AV codec (25) that encodes a digital video signal recorded on the recording medium, and a recording medium (21) on which the digital video signal encoded by the AV codec (25) is recorded. Also, a card I / F (interface) (221) to which a memory card (22) can be connected is connected to the bus (201), and the digital video signal encoded by the AV codec (25) is It may be recorded on the memory card (22).

  Further, a microphone (72) is connected to the bus (201) via an audio I / F (75), and a digital output signal obtained by digitizing an analog output signal of the microphone (72) is temporarily recorded. And an audio analysis unit (6) for analyzing a digital output signal recorded in the audio buffer (26). The AV codec (25) can also encode the digital output signal recorded in the audio buffer (26).

  FIG. 2 is a block diagram showing the configuration of the voice analysis unit (6). As shown in FIG. 2, the sound analysis unit (6) includes a volume level determination unit (61). The volume level determination unit (61) determines whether the volume level of the analog output signal corresponding to the digital output signal is greater than the reference level L0 based on the digital output signal recorded in the audio buffer (26). The determination result R1 is output.

FIG. 3 is a diagram showing a waveform of an analog output signal of the microphone (72). Here, the analog output signal AS1 is an analog signal output from the microphone (72) when the microphone (72) acquires the voice of the person when the person is cheering. The analog output signal AS2 is an analog signal output from the microphone (72) when the microphone (72) acquires the voice of the person when the person is talking. The analog output signal AS3 is an analog signal output from the microphone (72) when the microphone (72) acquires sound such as music.
As shown in FIG. 3, the reference level L0, which is the determination reference of the volume level determination unit (61), is set to a level between the maximum volume level of the analog output signal S2 and the maximum volume level of the analog output signal S1. Is done.

When the digital output signal DS1 obtained by digitizing the analog output signal AS1 is recorded in the audio buffer (26), the volume level determination unit (61) determines the volume level of the analog output signal AS1 based on the digital output signal DS1. It determines with it being larger than the reference level L0 (yes determination). The same applies when the digital output signal DS3 obtained by digitizing the analog output signal AS3 having a maximum volume level greater than the reference level L0 is recorded in the audio buffer (26) as shown in FIG.
On the other hand, when the digital output signal DS2 obtained by digitizing the analog output signal AS2 is recorded in the audio buffer (26), the volume level determination unit (61) determines the volume of the analog output signal AS2 based on the digital output signal DS2. It is determined that the level is not greater than the reference level L0 (no determination).

  As shown in FIG. 2, the voice analysis unit (6) further includes a voice determination unit (62). The voice determination unit (62) analyzes the digital output signal recorded in the voice buffer (26) to determine whether or not a human voice signal is included in the digital output signal, and the determination result R2 Is output.

Specifically, the voice determination unit (62) includes a power conversion unit (621), a change amount calculation unit (622), a change point detection unit (623), and a change point number determination unit (624). .
Based on the digital output signal recorded in the audio buffer (26), the power converter (621) converts the audio level of the analog audio signal corresponding to the digital output signal into a power value. Here, in the power conversion unit (621), the power value is calculated as digital data.

  Based on the digital data of the power value output from the power conversion unit (621), the change amount calculation unit (622) calculates the change amount of the power value with respect to time as shown in FIG. Here, in the change amount calculation unit (622), the change amount is calculated as digital data. FIG. 4 is a diagram showing the change amount converted into analog data in order to visualize the change amount of the power value.

  Based on the digital data of the change amount of the power value output from the change amount calculation unit (622), the change point detection unit (623) has a maximum value where the change amount is larger than the predetermined value P0 as shown in FIG. The change point C is detected, and time information relating to the time when the change point C occurs is output.

Based on the time information output from the change point detection unit (623), the change point number determination unit (624) determines that the number of conversion points C existing during a predetermined time width T0 (see FIG. 3) is greater than the predetermined number. Determine whether it is larger.
Here, when the human output signal is included in the digital output signal recorded in the audio buffer (26), the number of change points C appearing during the predetermined time width T0 increases. On the other hand, when the human output signal is not included in the digital output signal recorded in the audio buffer (26), the number of change points C appearing during the predetermined time width T0 is remarkably reduced. The predetermined number serving as a determination criterion of the change point determination unit (624) is the number of change points C appearing during a predetermined time width T0 in the digital output signal including the human voice signal (for example, (Average value) and the number (for example, average value) of change points C that appear during a predetermined time width T0 in the digital output signal that does not include human speech signals.

Therefore, when the digital output signal DS1 obtained by digitizing the analog output signal AS1 (FIG. 3) including the human audio signal is recorded in the audio buffer (26), the change point determination unit (624) has a predetermined time width. It is determined that the number of change points C existing during T0 is greater than a predetermined number. The same applies to the case where the digital output signal DS2 obtained by digitizing the analog output signal AS2 (FIG. 3) including the human voice signal is recorded in the voice buffer (26).
On the other hand, when the digital output signal DS3 obtained by digitizing the analog output signal AS3 (FIG. 3) that does not include the human voice signal is recorded in the voice buffer (26), the change point determination unit (624) It is determined that the number of change points C existing between the widths T0 is not greater than a predetermined number.

  Therefore, when the change point determination unit (624) determines that the number of change points C existing during the predetermined time width T0 is larger than the predetermined number, the digital output signal recorded in the audio buffer (26) That is, it is determined by the voice determination unit 62 that the human voice signal is included in the analog output signal of the microphone 72 (yes determination). On the other hand, when the change point determination unit (624) determines that the number of change points C existing during the predetermined time width T0 is not larger than the predetermined number, the digital output recorded in the audio buffer (26) It is determined by the voice determination unit (62) that the signal (that is, the analog output signal of the microphone (72)) does not contain a human voice signal (No determination).

  The control circuit (5) instructs the above-described voice analysis unit (6) to analyze the digital output signal recorded in the voice buffer (26), and outputs from the received voice analysis unit (6). Based on the two determination results R1 and R2, the execution / stop of the digital video signal recording operation is controlled.

  As shown in FIG. 1, the bus (201) further controls the position of the camera platform (3) to change the camera (1) position between the first position and the second position. A control unit (31) is connected.

  The drive recorder (2) of the present embodiment includes a speaker (71) that outputs sound, a display device (73) that displays a setting screen, video, and the like, and an input device (74) that inputs an operation command. ) And are deployed. The speaker (71) is connected to the bus (201) via the audio I / F (75), the display device (73) is connected to the bus (201) via the video output unit (76), and the input device ( 74) is connected to the bus (201) via the user I / F (77).

  Next, the recording operation of the drive recorder (2), that is, the recording control procedure executed by the control circuit (5) will be described with reference to the flowchart shown in FIG. In this recording control procedure, a variable t to which time is to be input is set.

  When the recording control procedure is started, first, in step S11, the control circuit (5) inputs the start time t0 of the recording control procedure to the variable t. Next, in step S12, the control circuit (5) determines whether or not a predetermined time x has elapsed since the time input to the variable t. Specifically, the control circuit (5) determines whether or not the time (t + x) obtained by adding the time input to the variable t and the predetermined time x is equal to the current time.

If the current time has not reached the time (t + x) and it is determined NO in step S12, it is determined again in step S12 whether the current time is equal to the time (t + x), and in step S12. Step S12 is repeatedly executed until it is determined as YES.
On the other hand, when the current time reaches the time (t + x) and it is determined as YES in step S12, the control circuit (5) shifts the recording control procedure to step S13 and sets the variable t to the time (t + x). Rewrite by

  In step S14 after execution of step S13, the control circuit (5) instructs the audio analysis unit (6) to analyze the digital output signal recorded in the audio buffer (26). The voice analysis unit (6) that has received the command from the control circuit (5) executes the analysis, whereby the determination result R1 is output from the volume level determination unit (61) and the determination from the voice determination unit (62). The result R2 is output.

  In step S15, the control circuit (5) receives the determination result R1 output from the volume level determination unit (61). When the received determination result R1 is NO, the control circuit (5) shifts the recording control procedure to step S20 to stop the recording operation of the digital video signal or when the recording operation has already been stopped. In that case, the stop state is continued.

  When the determination result R1 received in step S15 is YES, the control circuit (5) receives the determination result R2 output from the voice determination unit (62) in step S16. When the received determination result R2 is NO, the control circuit (5) shifts the recording control procedure to step S20 to stop the recording operation of the digital video signal or when the recording operation has already been stopped. In that case, the stop state is continued.

  If the determination result R2 received in step S16 is YES, the control circuit (5) shifts the recording control procedure to step S17 to execute the recording operation of the digital video signal or the recording operation has already been executed. If so, the recording operation is continued. Specifically, the control circuit (5) correlates the digital video signal recorded in the video buffer (24) and the digital output signal recorded in the audio buffer (26) with each other in the recording medium (21 ) Or memory card (22).

Subsequently, in step S18, the control circuit (5) determines whether or not the recording time is equal to the predetermined time y. If the recording time has not reached the predetermined time y and it is determined NO in step S18, it is again determined in step S18 whether the recording time is equal to the predetermined time y, and in step S18. Step S18 is repeatedly executed until it is determined as YES.
On the other hand, when the recording time reaches the predetermined time y and it is determined as YES in step S18, the control circuit (5) shifts the recording control procedure to step S19 to perform the recording operation of the digital video signal. At the same time, the variable t is rewritten with the time (t + y).

After execution of step S19, in step S21, the control circuit (5) determines whether or not an imaging stop command for stopping imaging is input from the input device (74). If no photographing stop command is input from the input device (74) and it is determined NO in step S21, the control circuit (5) returns the recording control procedure to step S12 and executes steps S12 to S21 again. To do. Then, the control circuit (5) repeatedly executes steps S12 to S21 until it is determined as YES in step S21.
On the other hand, when an imaging stop command is input from the input device (74) and it is determined YES in step S21, the control circuit (5) ends the recording control procedure.

  When a change occurs in the subject to be photographed by the camera (1) (for example, a scenery outside the car) and a cheer occurs in the car, the analog output signal of the microphone (72) includes a human voice signal and the analog output signal. The volume level of becomes higher than the reference level L0. Accordingly, the two determination results R1 and R2 output from the voice analysis unit (6) are both determined as yes. Therefore, according to the recording control procedure, recording by the drive recorder (2) is executed for a predetermined time y.

  On the other hand, when there is almost no change in the object to be photographed by the camera (1) and no cheering occurs in the automobile, the analog output signal of the microphone (72) does not include a human voice signal or the microphone (72 Even if a human voice signal is included in the analog output signal of), the volume level of the analog output signal is smaller than the reference level L0. Therefore, one of the two determination results R1 and R2 output from the voice analysis unit (6) is no. Therefore, according to the recording control procedure, recording by the drive recorder (2) is stopped.

  Therefore, the drive recorder (2) can extract and record a characteristic image when cheering occurs among the images acquired by the camera (1).

  In the drive recorder (2), the digital video signal recorded in the video buffer (24) and the digital output signal recorded in the audio buffer (26) are associated with each other in the recording medium (21 Or a memory card (22). Therefore, according to the drive recorder (2), a characteristic image when a cheer occurs is recorded together with the sound.

  FIG. 6 is a flowchart showing a modified example of the recording control procedure executed by the control circuit (5). As shown in FIG. 6, in this modification, when the determination result R2 received in step S16 is YES, the control circuit (5) shifts the recording control procedure to step S31, and the pan head control unit ( The first control command is transmitted to 31). Upon receiving the first control command, the pan head control unit (31) controls the pan head (3) to change the posture of the camera (1) to the first posture. As a result, the camera (1) faces the inside of the automobile.

  Thereafter, in step S32, the control circuit (5) executes the digital video signal recording operation, or continues the recording operation if the recording operation has already been executed. Specifically, the control circuit (5) correlates the digital video signal recorded in the video buffer (24) and the digital output signal recorded in the audio buffer (26) with each other in the recording medium (21 ) Or memory card (22).

Subsequently, in step S33, the control circuit (5) determines whether or not the recording time is equal to the predetermined time z1. If the recording time has not reached the predetermined time z1 and it is determined NO in step S33, it is again determined in step S33 whether or not the recording time is equal to the predetermined time z1, and in step S33. Step S33 is repeatedly executed until it is determined as YES.
On the other hand, when the recording time reaches the predetermined time z1 and it is determined as YES in step S33, the control circuit (5) shifts the recording control procedure to step S34, and the pan head control unit (31). 2nd control command is transmitted to. Upon receiving the second control command, the pan head control unit (31) controls the pan head (3) to change the posture of the camera (1) to the second posture. As a result, the camera (1) faces outside the automobile.

Thereafter, in step S35, the control circuit (5) continues the digital video signal recording operation. Subsequently, in step S36, the control circuit (5) determines whether or not the recording time after the transmission of the second control signal in step S34 is equal to the predetermined time z2. If the recording time has not reached the predetermined time z2 and it is determined NO in step S36, it is determined again in step S36 whether the recording time is equal to the predetermined time z2, and in step S36. Step S36 is repeatedly executed until it is determined as YES.
On the other hand, when the recording time reaches the predetermined time z2 and it is determined as YES in step S36, the control circuit (5) shifts the recording control procedure to step S37 to perform the recording operation of the digital video signal. At the same time, the variable t is rewritten by the time (t + z1 + z2).

  After execution of step S37, the control circuit (5) shifts the recording control procedure to step S21.

  According to the recording control procedure according to the modified example, when a change occurs in the photographing object outside the vehicle (for example, scenery outside the vehicle) of the camera (1) and a cheer occurs in the vehicle, the camera (1) is in the vehicle. A video of a passenger cheering in the car is recorded for a predetermined time z1, and then the camera (1) is directed outside the car, and the video to be photographed outside the car is predetermined. Will be recorded for the time z2.

In addition, each part structure of this invention is not restricted to the said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim.
In the above embodiment, the camera (1) is connected to the drive recorder (2), but the present invention is not limited to this. For example, the camera (1) may be built in the drive recorder (2). In this case, the drive recorder (2) is attached to the pan head (3).

  In the above embodiment, the microphone (72) is built in the drive recorder (2), but the present invention is not limited to this. For example, the microphone (72) may be connected to the drive recorder (2) from the outside.

  Means for determining whether or not a human voice signal is included in the analog output signal of the microphone (72) or a digital output signal obtained by digitizing the analog output signal is not limited to the voice determination unit (62) described above, and various The voice determination means can be used.

  In addition, an impact detection sensor for detecting the impact on the automobile caused by the occurrence of an accident or sudden deceleration is installed in the automobile, and the drive recorder (2) detects the impact by the impact detection sensor. In this case, the video signals before and after detection may be read from the video buffer (24) and recorded on the recording medium (21) or the memory card (22).

  The drive recorder (2) is not limited to automobiles and can be mounted on various moving bodies such as bicycles and motorcycles. The various configurations employed in the drive recorder (2) can be applied to various recording devices mounted on a moving body such as an automobile, a bicycle, and a motorcycle. The various configurations employed in the drive recorder (2) can be applied to portable recording devices such as video cameras.

(1) Camera (imaging device)
(2) Drive recorder (recording device)
(21) Recording media (storage media)
(22) Memory card (storage medium)
(24) Video buffer (first buffer)
(26) Audio buffer (second buffer)
(3) Head (posture change means)
(5) Control circuit (recording control means)
(6) Speech analysis unit
(61) Volume level judgment unit (volume level judgment means)
(62) Voice judgment unit (voice judgment means)
(622) Change calculation unit (calculation means)
(624) Change point determination unit (change point determination means)
(72) Microphone L0 Reference level C Change point T0 Predetermined time width P0 Predetermined value

Claims (5)

In a recording device in which a microphone, an imaging device, and a storage medium are connected or mounted, respectively, and an output signal of the microphone and a video signal output from the imaging device can be recorded on the storage medium.
A sound determination means for analyzing the output signal of the microphone and determining whether or not a human sound signal is included in the output signal;
Volume level determination means for determining whether the volume level of the output signal is greater than a reference level based on the output signal of the microphone;
When it is determined by the sound determination means that a human sound signal is included in the output signal of the microphone, and the sound volume level determination means determines that the volume level of the output signal is greater than a reference level, from the imaging device The output video signal is recorded in a storage medium, and it is determined by the sound determination means that the output signal of the microphone does not contain a human sound signal, or the volume level of the output signal is determined by the volume level determination means. A recording apparatus comprising: a recording control unit that stops recording the video signal output from the imaging apparatus on a storage medium when it is determined that the image signal is not larger. The voice determination means is
Based on the output signal of the microphone, calculating means for calculating the amount of change of the power value of the output signal with respect to time;
Change point determination means for determining whether or not the number of change points that are maximal values existing during a predetermined time width and are greater than a predetermined value among the change amounts calculated by the calculation means is greater than a predetermined number; And when the number of change points is determined to be larger than a predetermined number by the change point determination means, it is determined that a human voice signal is included in the output signal of the microphone, and the change point determination means The recording apparatus according to claim 1, wherein when it is determined that the number of change points is not greater than the predetermined number, it is determined that a human voice signal is not included in the output signal of the microphone. A first buffer for temporarily recording a video signal output from the imaging apparatus; and a second buffer for temporarily recording an output signal of a microphone. The sound determination means is provided in the second buffer. The recorded output signal is analyzed to determine whether or not a human voice signal is included in the output signal, and the volume level determination means is configured to output the output signal recorded in the second buffer. Based on whether the volume level of the output signal is greater than a reference level,
The recording control means determines that a human voice signal is included in the output signal of the microphone by the voice determination means, and determines that the volume level of the output signal is greater than a reference level by the volume level determination means. 3. The recording apparatus according to claim 1, wherein the video signal recorded in the first buffer and the output signal recorded in the second buffer are recorded on a storage medium in association with each other.   The recording apparatus according to any one of claims 1 to 3, an imaging apparatus connected to or mounted on the recording apparatus, a microphone connected to or mounted on the recording apparatus, and connected to or mounted on the recording apparatus. Recording system comprising a storage medium. It further includes posture changing means connected to the recording device and installed on a moving body to change the posture of the imaging device,
The recording control unit of the recording apparatus determines that the human output signal is included in the output signal of the microphone by the sound determination unit of the recording apparatus, and the volume of the output signal by the volume level determination unit of the recording apparatus. When it is determined that the level is greater than the reference level, the image change device is controlled to direct the image pickup device into the moving body, and the video signal output from the image pickup device is recorded in a storage medium for a predetermined time, and thereafter 5. The recording system according to claim 4, wherein the video signal output from the imaging device is recorded on a storage medium by controlling the posture changing means so that the imaging device is directed outside the moving body.

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