JP4668095B2 - Recording device - Google Patents

Description

  The present invention relates to a recording apparatus such as a camera door phone.

  Recording devices such as conventional surveillance cameras and camera doorphones are always supplied with power and continue to operate. For this reason, the amount of power consumption increases and the durability of the component parts is shortened, which is not preferable. Therefore, power saving is important in an apparatus that is constantly supplied with power, such as the recording apparatus. Conventional techniques for realizing such power saving are described in Patent Documents 1 to 5.

  In the camera system of Patent Document 1, the power supplied to the wireless interface unit of the camera is controlled by a timer. The digital camera disclosed in Patent Document 2 is configured to monitor an input state of an operation signal and shift to a power saving state when no operation signal is input for a predetermined time. The object detection device of Patent Document 3 includes an infrared sensor, and is configured to activate a video camera and a microphone when an object is detected by the infrared sensor.

  The motion detection camera system of Patent Document 4 is configured to perform motion detection using a plurality of cameras. The home appliance power saving control device of Patent Literature 5 performs image processing based on the image captured by the image sensor, and determines whether or not there is a person in the room during operation of the home appliance. When a person is not in the room, an optical code signal is transmitted after an appropriate period of time to shut off the power to the household electrical appliances. When a person returns to the room, an optical code signal is transmitted after an appropriate period of time has elapsed. It is configured to turn on the power of home appliances.

JP 2003-46846 A JP 2004-186919 A Japanese Patent Laid-Open No. 2004-220224 JP 2004-328736 A JP 2004-348349 A

  In Patent Document 1, since the power source is simply controlled by a timer, a photographed image is displayed when it is not necessary to operate at all, for example, when there is no subject, and the camera is dark at night. However, it will operate even when it is difficult to recognize, and there is a problem that power is consumed wastefully.

  In Japanese Patent Laid-Open No. 2004-260688, when the operation signal is not input for a predetermined time, the power saving state is set. Therefore, the operation state is not changed unless the operation signal is input. Therefore, in Patent Document 2, when shifting from the power saving state to the operating state, the user has to perform a predetermined operation input, so that the burden of the user's operation input increases.

  In patent document 3, since it is necessary to install an infrared sensor in order to detect an object with an infrared sensor, the user must bear the installation cost of the infrared sensor. In addition, since power must always be supplied to the infrared sensor, there is a problem that power consumption increases.

  In Patent Document 4, since a plurality of cameras are used for motion detection, there is a problem that power consumption increases and manufacturing cost increases. In Patent Document 5, in order to realize power saving of home appliances, whether or not there is a person in the room is determined based on an image captured by the image sensor, but power is always supplied to the image sensor. Since it needs to be supplied, there is a problem that the power consumption of the image sensor increases.

  In the prior art disclosed in each of the above-mentioned patent documents, the component that cannot reduce the burden of user operation input, wastes power in the device, and increases power consumption. Therefore, it is not possible to effectively save power.

  An object of the present invention is to provide a recording apparatus that can save the user's trouble of operation input and can realize power saving.

The present invention is a recording apparatus that includes an imaging unit that captures an image, and that transmits an image captured by the imaging unit to a communication device capable of outputting the image ,
Storage means for storing the image captured by the imaging means,
Connected to the communication line, when power is supplied and a communication connecting means for communicating with the communication device via the communication line,
A power supply means for supplying power to the imaging means, the storage means and the communication connection means;
Power supply control means for controlling the power supply means;
Interrupt generating means for generating an interrupt for supplying power after elapse of a predetermined time after the supply of power is limited to the imaging means and the storage means;
Based on the determination target image to be determined among the images stored in the storage unit and the comparison target image to be compared with the determination target image, the presence or absence of a change in the determination target image with respect to the comparison target image is determined. Determination means for
The determination means determines whether there is an image request from the communication device via the communication connection means when the power supply means supplies power to the imaging means, the storage means, and the communication connection means. Has a function to determine
The power supply control means controls the power supply means to supply power to the imaging means and the storage means in response to the occurrence of an interrupt by the interrupt generation means, and then determines that there is a change by the determination means. that when the supply power to the communication connecting means, when it is determined that no change by the determination means, so as to limit the power supply to the imaging means and the storing hand stage, controls the power supply unit And
When the determination unit determines that there is no image request from the communication device after the power is supplied to the communication connection unit, the power supply control unit is configured to capture the imaging unit, the storage unit, and the communication connection unit. The recording apparatus is characterized in that the power supply means is controlled so as to limit the supply of power to the apparatus.

The present invention further includes image selection means for selecting a determination target image and a comparison target image from images stored in the storage means,
When the determination target image and the comparison target image are selected by the image selection unit, the determination unit compares the density value of each pixel of the determination target image with the density value of each pixel of the comparison target image. When the ratio of pixels having different density values with respect to all pixels is less than a predetermined threshold, it is determined that there is no change in the determination target image with respect to the comparison target image.

In addition, the present invention further includes calculation means for obtaining the sum of squares of the difference between the density value of each pixel of the determination target image selected by the image selection means and the density value of each pixel of the comparison target image,
The determination unit determines that there is no change in the determination target image with respect to the comparison target image when the total value obtained by the calculation unit is less than a predetermined threshold value.

Further, in the present invention, the computing means calculates the square of the difference between the density value of each pixel in the predetermined area of the determination target image selected by the image selecting means and the density value of each pixel in the predetermined area of the comparison target image. Find the sum,
The determination unit determines that there is no change in the determination target image with respect to the comparison target image when the total value obtained by the calculation unit is less than a predetermined threshold value.

In the present invention, the calculation means has a function of obtaining a sum value of density values of the respective pixels of the image stored in the storage means,
A judgment means for judging whether or not a total value of the density values obtained by the computing means is less than a predetermined threshold;
When the sum value of the density values is determined to be less than the predetermined threshold value by the determination means, the power supply control means, so as to limit the power supply to the imaging means and the storing hand stage, controls the power supply unit It is characterized by doing.

Further, the present invention is a recording apparatus that includes voice input means for inputting voice, and transmits the voice input by the voice input means to a communication device capable of outputting voice ,
Storage means for storing the voice inputted by said voice input means,
Connected to the communication line, when power is supplied and a communication connecting means for communicating with the communication device via the communication line,
A power supply means for supplying power to said audio input means, said storage means and the communication connection means;
Power supply control means for controlling the power supply means;
Interrupt generation means for generating an interrupt for supplying power after a predetermined time has elapsed since the supply of power was restricted to the voice input means and the storage means;
And sound pressure level detecting means for detecting a sound pressure level which represents the intensity of the sound to be stored in the storage means,
And a determining means for determining whether a sound pressure level detecting means is detected by the sound pressure level is above the predetermined threshold value,
The determination means determines whether there is a voice request from the communication device via the communication connection means when the power supply means supplies power to the voice input means, the storage means, and the communication connection means. Has a function to determine
The power supply control means controls the power supply means to supply power to the voice input means and the storage means in response to the occurrence of an interrupt by the interrupt generation means, and then the sound pressure level is determined by the determination means. If it is determined to be previously defined threshold value or more, the supply power to communication connection unit, the sound pressure level is determined to be less than a predetermined threshold by the determination unit, the voice input means and the storing hand so as to limit the power supply to the stage, and controls the power supply unit,
When the power supply control means determines that there is no voice request from the communication device after the power is supplied to the communication connection means, the voice input means, the storage means and the communication connection The recording apparatus is characterized in that the power supply means is controlled so as to limit supply of power to the means .

In the present invention, the storage means further stores the sound pressure level detected by the sound pressure level detection means,
A sound pressure level selecting means for selecting a determination target sound pressure level to be determined and a comparison target sound pressure level to be compared from the sound pressure levels stored in the storage means;
In the determination unit, when the determination target sound pressure level and the comparison target sound pressure level are selected by the sound pressure level selection unit, the absolute value of the difference between the determination target sound pressure level and the comparison target sound pressure level is equal to or greater than a predetermined threshold value. Has a function to determine whether or not
The power supply control means
If the absolute value by the determination means is determined to be equal to or larger than the predetermined threshold value, and supplies power to the communication connection unit,
If the absolute value by the determination means is determined to be less than a predetermined threshold, so as to limit the power supply to the audio input means and said memory hand stage, and controlling the power supply means .

According to the present invention, if it is determined that there is a change in the determination target image with respect to the comparison target image by the determination unit, the power supply control means controls the power supply unit to supply power to the communication connecting means. If it is determined that there is no change in the determination target image with respect to the comparison target image by the determination unit, the power supply control means controls the power supply means so as to limit the power supply to the imaging means and the storing hand stage.

  In this way, by controlling the power supply means based on whether or not the determination target image has changed with respect to the comparison target image, power is supplied to the imaging means, the storage means, and the communication connection means, or the supply of power is limited. Therefore, the user does not need to perform an operation input for controlling the power supply means. Therefore, it is possible to save time and effort for the user's operation input.

Also when there is no change in the determination target image for comparison target image, since the power supply to the imaging means and the storing hand stage by the power supply unit is restricted, as compared with the case where power is constantly supplied, the imaging means and storage hand stage can reduce the power consumed. Therefore, power saving can be realized effectively.

In addition, since the power consumed by the imaging unit, the storage unit, and the communication connection unit can be reduced, the imaging unit, the storage unit, and The load on the communication connection means can be reduced, and the durable life can be extended.
The determination unit determines whether there is a request for an image from the communication device via the communication connection unit when the power supply unit supplies power to the imaging unit, the storage unit, and the communication connection unit. When the determination unit determines that there is no image request from the communication device, the power supply control unit controls the power supply unit to limit the supply of power to the imaging unit, the storage unit, and the communication connection unit.
As described above, when there is no image request from the communication device by the determination unit, power supply to the image capturing unit, the storage unit, and the communication connection unit by the power supply unit is limited, so even when there is no image request from the communication device. Compared with the case where power is always supplied, the power consumed by the imaging means, the storage means, and the communication connection means can be reduced. Therefore, it is possible to effectively realize power saving without providing a special configuration.

  According to the invention, when the determination target image and the comparison target image are selected by the image selection unit, the determination unit calculates the density value of each pixel of the determination target image and the density value of each pixel of the comparison target image. Compare. When the ratio of pixels having different density values with respect to all pixels of the determination target image is less than a predetermined threshold value, the determination unit determines that there is no change in the determination target image with respect to the comparison target image. When the determination unit determines that there is no change in the determination target image with respect to the comparison target image, the power supply control unit controls the power supply unit to limit the supply of power to the imaging unit, the storage unit, and the communication connection unit. To do.

  As described above, when the ratio of pixels having different density values with respect to all the pixels of the determination target image is less than a predetermined threshold value, it is determined that there is no change in the determination target image with respect to the comparison target image, and the imaging unit and storage by the power supply unit Since the power supply to the means and the communication connection means is limited, the power consumed by the imaging means, the storage means, and the communication connection means can be reduced as compared with the case where the power is always supplied. Therefore, power saving can be realized effectively.

  According to the invention, the calculating means obtains the sum of squares of the difference between the density value of each pixel of the determination target image selected by the image selecting means and the density value of each pixel of the comparison target image. When the total value obtained by the calculation means is less than a predetermined threshold value, the determination means determines that there is no change in the determination target image with respect to the comparison target image. When the determination unit determines that there is no change in the determination target image with respect to the comparison target image, the power supply control unit controls the power supply unit to limit the supply of power to the imaging unit, the storage unit, and the communication connection unit. To do.

  In this way, when the total value obtained by the calculation means is less than the predetermined threshold value, it is determined that there is no change in the determination target image with respect to the comparison target image, and the power supply means supplies the image pickup means, the storage means, and the communication connection means. Since the power supply is limited, the power consumed by the imaging unit, the storage unit, and the communication connection unit can be reduced as compared with the case where the power is always supplied. Therefore, power saving can be realized effectively.

  Further, according to the present invention, the calculation means calculates the difference between the density value of each pixel in the predetermined area of the determination target image selected by the image selection means and the density value of each pixel in the predetermined area of the comparison target image. Find the sum of squares. The calculation means obtains the total value for the predetermined areas of the determination target image and the comparison target image selected by the image selection means, and thus calculates the total value for all the areas of the determination target image and the comparison target image. Compared with the case of obtaining | requiring, the amount of calculations can be reduced and the said total value can be calculated | required in a comparatively short time.

  When the total value obtained by the calculation means is less than a predetermined threshold value, the determination means determines that there is no change in the determination target image with respect to the comparison target image. When the determination unit determines that there is no change in the determination target image with respect to the comparison target image, the power supply control unit controls the power supply unit to limit the supply of power to the imaging unit, the storage unit, and the communication connection unit. To do.

  In this way, when the total value obtained by the calculation means is less than the predetermined threshold value, it is determined that there is no change in the determination target image with respect to the comparison target image, and the power supply means supplies the image pickup means, the storage means, and the communication connection means. Since the power supply is limited, the power consumed by the imaging unit, the storage unit, and the communication connection unit can be reduced as compared with the case where the power is always supplied. Therefore, power saving can be realized effectively.

According to the invention, the calculation means obtains the sum value of the density values of the pixels of the image stored in the storage means. The determining means determines whether or not the total value of the density values obtained by the calculating means is less than a predetermined threshold value. When the density value is determined to be less than the predetermined threshold value by the determination means, the power supply control means controls the power supply means so as to limit the power supply to the imaging means and the storing hand stage.

When the sum value of the density values obtained by this way operation means is less than the threshold value, since the power supply to the imaging means and the storing hand stage by the power supply unit is restricted, it is always supplied power as compared to the case, the imaging means and the storage hands stage it is possible to reduce the power consumption. Therefore, power saving can be realized effectively.

According to the present invention, the sound pressure level sound pressure level detected by the detection means is determined by the determining means is equal to or greater than the predetermined threshold value, the power supply control unit supplies power to communication connecting means Thus, the power supply means is controlled. When the sound pressure level by the determining means is determined to be less than a predetermined threshold, the power supply control means controls the power supply means so as to limit the power supply to the audio input means and storing hand stage.

  Thus, by controlling the power supply means based on the sound pressure level detected by the sound pressure level detection means, power is supplied to the voice input means, the storage means, and the communication connection means, or power supply is performed. Since it can be restricted, the user does not need to perform an operation input for controlling the power supply means. Therefore, it is possible to save time and effort for the user's operation input.

Also, when the sound pressure level is less than the predetermined threshold value, the power supply to the audio input means and storing the hand stage by the power supply unit is restricted, as compared with the case where power is constantly supplied, voice input means and storing the hand stages can reduce the power consumed. Therefore, power saving can be realized effectively.

Further, since the power consumed by the voice input means, the storage means and the communication connection means can be reduced, the voice input means, compared with the case where power is always supplied to the voice input means, the storage means and the communication connection means, It is possible to reduce the load on the storage means and the communication connection means and to prolong the durable life.
The determination unit determines whether there is a voice request from the communication apparatus via the communication connection unit when the power supply unit supplies power to the voice input unit, the storage unit, and the communication connection unit. When it is determined by the determination means that there is no voice request from the communication device, the power supply control means controls the power supply means so as to limit the power supply to the voice input means, the storage means, and the communication connection means.
Thus, when there is no voice request from the communication device by the judging means, the power supply means limits the power supply to the voice input means, the storage means, and the communication connection means, so there is no voice request from the communication device. However, the power consumed by the voice input means, the storage means, and the communication connection means can be reduced as compared with the case where power is always supplied. Therefore, it is possible to effectively realize power saving without providing a special configuration.

Further, according to the present invention, when the determination target sound pressure level and the comparison target sound pressure level are selected by the sound pressure level selection means, the determination means calculates the absolute difference between the determination target sound pressure level and the comparison target sound pressure level. It is determined whether or not the value is greater than or equal to a predetermined threshold value. If the absolute value by the determination means is determined to be equal to or larger than the predetermined threshold value, the power supply control means controls the power supply unit to supply power to the communication connecting means. If the absolute value by the determination means is determined to be less than a predetermined threshold, the power supply control means controls the power supply means so as to limit the power supply to the audio input means and storing hand stage.

When the absolute value of the difference between this way determination target sound pressure level as compared sound pressure level is less than the predetermined threshold value, the power supply to the audio input means and storing the hand stage by the power supply unit is restricted , compared to the case where power is constantly supplied, reducing the power voice input means and storing the hand stage is consumed. Therefore, power saving can be realized effectively.

FIG. 1 is a block diagram showing a recording apparatus 1 and data terminal apparatuses 2 and 3 according to the first embodiment of the present invention. The recording apparatus 1 includes a communication interface 11, an imaging unit 12, an audio input unit 13, a power control unit 14, a flash memory 15, a random access memory (Random
Access Memory (abbreviation: RAM) 16 and a processing unit 17 are included.

The communication interface 11 which is a communication connection means is a local area network (
A local area network (abbreviation: LAN) 18 is connected to the data terminal devices 2 and 3 which are communication devices via a communication line and the like, and communicates with the data terminal devices 2 and 3. The data terminal device 2 is realized by a door phone device having a telephone communication function, for example. The data terminal device 3 is realized by, for example, a personal computer (abbreviation: PC). The data terminal devices 2 and 3 are provided with a display and a speaker.

The imaging unit 12 which is an imaging unit is realized by, for example, a charge coupled device (abbreviation: CCD) image sensor. The imaging unit 12 is installed at a position where an image to be imaged desired by the user can be imaged, and images an image to be imaged desired by the user. The imaging unit 12 is a complementary metal-oxide semiconductor (Complementary Metal-Oxide).
Semiconductor (abbreviation: CMOS) may be realized by an image sensor. The imaging unit 12 is electrically connected to a processing unit 17 described later. An image picked up by the image pickup unit 12 is stored in a flash memory 15 described later.

  The voice input unit 13 as voice input means is realized by a microphone, for example. The voice input unit 13 acquires voice around the installed position. The voice input unit 13 is electrically connected to a processing unit 17 described later. The voice acquired by the voice input unit 13 is stored in a flash memory 15 described later.

  The image captured by the imaging unit 12 and the audio acquired by the audio input unit 13 are transmitted to the data terminal devices 2 and 3 connected to the LAN 18 via the communication interface 11. The data terminal devices 2 and 3 output the image transmitted from the recording device 1 to the display, and output the sound transmitted from the recording device 1 from the speaker.

  The power supply control unit 14 that is a power supply unit supplies power to the communication interface 11, the imaging unit 12, the audio input unit 13, a flash memory 15, a RAM 16, and a processing unit 17 described later. A flash memory 15 serving as a storage unit is electrically connected to a processing unit 17 to be described later, stores an image captured by the imaging unit 12 in association with the date and time, and the voice and date and time input by the audio input unit 13. Are stored in association with each other. Further, the flash memory 15 stores the sound pressure level detected by the processing unit 17 described later in association with the date and time. Further, the flash memory 15 stores a control program for comprehensively controlling the hardware resources constituting the recording apparatus 1.

  The RAM 16 is realized by, for example, a synchronous dynamic RAM (abbreviation: SDRAM). The RAM 16 is electrically connected to a processing unit 17 described later, and temporarily stores images continuously provided from the imaging unit 12 and sounds provided from the sound input unit 13.

The processing unit 17 is realized by a central processing unit (abbreviation: CPU). The processing unit 17 includes a real time clock (abbreviation: RTC) that is an interrupt generation unit . The processing unit 17 uses an image stored in the flash memory 15 to determine an image to be determined (hereinafter referred to as “determination target image”) and an image to be compared with the determination target image (hereinafter referred to as “comparison target image”). And determining whether there is a change in the determination target image with respect to the comparison target image based on the selected determination target image and the comparison target image.

  The processing unit 17 obtains the sum of squares of the difference between the density value of each pixel of the selected determination target image and the density value of each pixel of the comparison target image. Further, the processing unit 17 obtains the sum of squares of the difference between the density value of each pixel in the predetermined area of the selected determination target image and the density value of each pixel in the predetermined area of the comparison target image.

  When the processing unit 17 determines that there is a change in the determination target image with respect to the comparison target image, the processing unit 17 controls the power supply control unit 14 to supply power to the imaging unit 12, the flash memory 15, the RAM 16, and the communication interface 11. When it is determined that there is no change in the determination target image with respect to the target image, the power supply control unit 14 is controlled so as to limit the power supply to the imaging unit 12, the flash memory 15, the RAM 16, and the communication interface 11.

  The processing unit 17 obtains a total value of density values of each pixel in one image stored in the flash memory 15 and determines whether or not the obtained total value of the density values is less than a predetermined threshold value. When the processing unit 17 determines that the sum of the density values is less than a predetermined threshold value, the power supply control unit 14 limits the supply of power to the imaging unit 12, flash memory 15, RAM 16, and communication interface 11. To control.

  The processing unit 17 receives an image request from the data terminal devices 2 and 3 through the communication interface 11 when the power control unit 14 supplies power to the imaging unit 12, the flash memory 15, the RAM 16, and the communication interface 11. It is determined whether or not. When the processing unit 17 determines that there is no image request from the data terminal devices 2 and 3, the processing unit 17 sets the power supply control unit 14 to limit the power supply to the imaging unit 12, the flash memory 15, the RAM 16, and the communication interface 11. Control.

  The processing unit 17 detects a sound pressure level representing the strength of the sound based on the sound stored in the flash memory 15, and determines whether or not the detected sound pressure level is equal to or higher than a predetermined threshold. When the processing unit 17 determines that the sound pressure level is equal to or higher than a predetermined threshold, the processing unit 17 controls the power supply control unit 14 to supply power to the voice input unit 13, the flash memory 15, the RAM 16, and the communication interface 11. When it is determined that the pressure level is less than a predetermined threshold value, the power supply control unit 14 is controlled so as to limit the power supply to the voice input unit 13, the flash memory 15, the RAM 16, and the communication interface 11.

  Further, the processing unit 17 selects a determination target sound pressure level to be determined and a comparison target sound pressure level to be compared from the sound pressure levels stored in the flash memory 15, and compares them with the selected determination target sound pressure level. It is determined whether or not the absolute value of the difference from the target sound pressure level is greater than or equal to a predetermined threshold value. When the processing unit 17 determines that the absolute value is equal to or greater than a predetermined threshold, the processing unit 17 controls the power supply control unit 14 to supply power to the voice input unit 13, the flash memory 15, the RAM 16, and the communication interface 11, and When it is determined that the absolute value is less than a predetermined threshold value, the power supply control unit 14 is controlled so as to limit the power supply to the voice input unit 13, the flash memory 15, the RAM 16, and the communication interface 11.

  In the present invention, restricting power supply means power supplied to the imaging unit 12, the audio input unit 13, the flash memory 15, the RAM 16, and the communication interface 11 (hereinafter, “unrestricted”) before restricting power supply. Less power (hereinafter sometimes referred to as “restricted power”) to the imaging unit 12, the audio input unit 13, the flash memory 15, the RAM 16, and the communication interface 11, and imaging. It means any one of stopping the supply of power to the unit 12, the voice input unit 13, the flash memory 15, the RAM 16, and the communication interface 11.

  When unrestricted power is supplied to the imaging unit 12, the imaging unit 12 captures, for example, 30 images per second. Further, when the limited power is supplied to the imaging unit 12, the imaging unit 12 captures, for example, one image per second.

  In the present embodiment, the power supplied to the imaging unit 12, the flash memory 15, the RAM 16, and the communication interface 11 is controlled based on whether or not the determination target image has changed with respect to the comparison target image captured by the imaging unit 12. Alternatively, based on the magnitude relationship between the sound pressure level of the sound input to the sound input unit 13 and a predetermined threshold value, whether to supply power to the sound input unit 13, the flash memory 15, the RAM 16, and the communication interface 11 is controlled. It is configured so that the user can select in advance.

  In the present embodiment, the image selection means, determination means, calculation means, determination means, power supply control means, sound pressure level selection means, and sound pressure level detection means correspond to the processing unit 17.

  FIG. 2 is a flowchart showing an operation procedure of the processing unit 17 relating to power supply control based on an image. This process is repeatedly executed during the operation of the recording apparatus 1. This process is executed by the processing unit 17. In step a1, a timer interrupt that generates an interrupt when a predetermined time, for example, 3 seconds elapses, is set in the RTC, and the process proceeds to step a2. In the present embodiment, the predetermined time is set to 3 seconds. However, when the power consumption is reduced to further save power, a time longer than 3 seconds may be set.

  In step a <b> 2, from the mode in which the power supply control unit 14 supplies power to the imaging unit 12, the flash memory 15, the RAM 16, and the communication interface 11 (hereinafter sometimes referred to as “normal mode”), the power supply control unit 14 performs the imaging unit 12. Then, the mode is switched to a mode that restricts the supply of power to the flash memory 15, the RAM 16, and the communication interface 11 (hereinafter sometimes referred to as “sleep mode”), and the process proceeds to step a3. Even in the sleep mode, unrestricted power is supplied from the power supply control unit 14 to the RTC of the processing unit 17.

  In step a3, the power supply control unit 14 is allowed to restrict power supply to the imaging unit 12, flash memory 15, RAM 16, and communication interface 11, and the process proceeds to step a4. In step a4, it is determined whether or not a predetermined time, specifically, the timer interruption time set in step a1 has elapsed. If it has elapsed, the process proceeds to step a5. stand by. When the time predetermined in step a4 elapses, the timer interrupt set in step a1 is generated for the processing unit 17.

  In step a5, the timer interrupt is used as a trigger to switch from the sleep mode to the normal mode, and the process proceeds to step a6. In step a6, the power control unit 14 is caused to supply unrestricted power to the imaging unit 12, the flash memory 15, and the RAM 16, and the process proceeds to step a7.

  In step a7, an image captured by the imaging unit 12 and stored in the flash memory 15 is acquired, and the process proceeds to step a8. More specifically, the comparison target image and the determination target image are acquired from the image stored in the flash memory 15. The determination target image of the present embodiment is the image with the newest date among the images stored in the flash memory 15, and the comparison target image is the next of the determination target image among the images stored in the flash memory 15. The date and time are new images.

  In step a8, it is determined whether there is a change in the determination target image with respect to the comparison target image. If it is determined that there is a change, the power control unit 14 is caused to supply unrestricted power to the communication interface 11, and step a9. If it is determined that there is no change, the process returns to step a1.

  Here, a method for determining whether there is a change in the determination target image with respect to the comparison target image will be described. The presence / absence of a change in the determination target image with respect to the comparison target image is determined by, for example, comparing the density value of each pixel of the determination target image with the density value of each pixel of the comparison target image. The determination is based on whether the ratio of different pixels is equal to or greater than a predetermined threshold. Specifically, the processing unit 17 determines that there is a change in the determination target image with respect to the comparison target image if the ratio of pixels having different density values to all the pixels of the determination target image is, for example, 30% or more. If the ratio is less than 30%, for example, it is determined that there is no change in the determination target image with respect to the comparison target image.

  Further, when a minute change of the determination target image with respect to the comparison target image is allowed, the sum of squares of the difference between the density value of each pixel of the determination target image and the density value of each pixel of the comparison target image is obtained and obtained. The presence / absence of a change in the determination target image with respect to the comparison target image may be determined based on whether the total value is equal to or greater than a predetermined threshold value.

  More specifically, the processing unit 17 determines that the sum of squares of the difference between the density value of each pixel of the determination target image and the density value of each pixel of the comparison target image is a predetermined threshold, in this embodiment. If it is 1024 or more, it is determined that there is a change in the determination target image with respect to the comparison target image. If the total value is less than a predetermined threshold, it is determined that there is no change in the determination target image with respect to the comparison target image. The threshold value to be compared with the sum of squares of the differences is set in consideration of squaring the difference of each pixel with 256 gradations. Therefore, the threshold value increases as the total number of pixels increases.

  When the sum of squares of the difference between the density value of each pixel of the above-described determination target image and the density value of each pixel of the comparison target image is obtained and the number of pixels of the determination target image and the comparison target image is large, The amount of calculation can be reduced by reducing the number of pixels to be calculated in the target image and the comparison target image to 1/4, for example. Thereby, the calculation time can be shortened.

  Further, the sum of squares of the difference between the density value of each pixel in the predetermined area of the determination target image and the density value of each pixel in the predetermined area of the comparison target image is obtained, and the obtained total value is equal to or greater than a predetermined threshold value. Whether or not there is a change in the determination target image with respect to the comparison target image may be determined based on whether or not it is. The predetermined region is a partial region of the determination target image and the comparison target image, and is one region in each image. The size of the predetermined region is selected to be ¼ of the size of the determination target image and the comparison target image, for example. As the predetermined region, for example, a region that can be captured by the subject in the determination target image and the comparison target image may be selected.

  Since the total value is obtained for the predetermined regions of the determination target image and the comparison target image in this way, the amount of calculation is reduced compared to the case where the total value is obtained for the entire region of the determination target image and the comparison target image. The total value can be obtained in a relatively short time.

  The sum of squares of the difference between the density value of each pixel in the plurality of predetermined areas of the determination target image and the density value of each pixel of the plurality of predetermined areas of the comparison target image is obtained. The presence or absence of a change in the determination target image with respect to the comparison target image may be determined based on whether or not the threshold value is equal to or greater than a predetermined threshold. By setting a plurality of regions, it is possible to more accurately determine whether or not the determination target image has changed with respect to the comparison target image.

  Focusing on the fact that the image picked up by the image pickup unit 12 changes little by little depending on the weather and time, it may be configured so that the setting of the plurality of predetermined areas can be changed. By changing the setting of a plurality of predetermined areas, for example, at predetermined time intervals, it is possible that problems due to changes over time, for example, misjudgment of whether there is a change in the determination target image with respect to the comparison target image, etc. occur as much as possible. Can be suppressed.

  When it is determined that there is a change in the determination target image with respect to the comparison target image based on the determination method as described above, in step a9, the time is determined in advance from the time when it is determined that there is a change in the determination target image with respect to the comparison target image. It is determined whether there is an external input or task activation within a time, for example, 1 second. If there is an external input or task activation, the process proceeds to step a10, and if not, the process returns to step a1. Here, the external input is a door phone call input, for example, and the task activation is, for example, a recording task activation. In the present embodiment, the predetermined time is set to 1 second. However, when the image to be captured is fast moving, a time shorter than 1 second may be set, and power consumption may be reduced. What is necessary is just to set time longer than 1 second.

  Whether there is an external input or task activation is determined based on whether an image request signal indicating an image request is transmitted from the data terminal apparatuses 2 and 3 via the LAN 18. Specifically, when the processing unit 17 recognizes that the image request signal has been transmitted from the data terminal devices 2 and 3, it is determined that there is an external input or task activation, and the image request signal is transmitted. If it is not recognized, it is determined that there is no external input or task activation.

  In step a10, a process based on external input or task activation (hereinafter referred to as “normal process”) is performed, and when the normal process ends, the process proceeds to step a11. Specifically, when the external input is a door phone call input, the image captured by the image capturing unit 12 is transmitted from the communication interface 11 to the data terminal device 2 via the LAN 18. When the processing unit 17 receives a communication stop signal that is transmitted when the user of the doorphone enters the on-hook state and stops communication between the recording device 1 and the data terminal device 2, it is based on a call input of the doorphone. Normal processing ends.

  When the task activation is a recording task, the image captured by the imaging unit 12 is transmitted from the communication interface 11 to the data terminal device 3 via the LAN 18. When the processing unit 17 receives a recording stop signal for stopping the recording task, the normal process based on the activation of the recording task is ended.

  In step a11, it is determined whether or not a predetermined time has elapsed since the time when it was determined in step a8 that the determination target image has changed with respect to the comparison target image. If not, the process returns to step a9 and the same process as described above is performed.

  As described above, according to the present embodiment, when the processing unit 17 determines that there is a change in the determination target image with respect to the comparison target image, the processing unit 17 supplies power to the imaging unit 12, the flash memory 15, the RAM 16, and the communication interface 11. The power supply control unit 14 is controlled as described above. If the processing unit 17 determines that there is no change in the determination target image with respect to the comparison target image, the processing unit 17 controls the power supply control unit 14 so as to limit the supply of power to the imaging unit 12, the flash memory 15, the RAM 16, and the communication interface 11. .

  Thus, based on the presence or absence of the change of the determination target image with respect to the comparison target image, the power control unit 14 is controlled to supply power to the imaging unit 12, the flash memory 15, the RAM 16, and the communication interface 11, Since the supply can be limited, the user does not need to perform an operation input for controlling the power supply control unit 14. Therefore, it is possible to save time and effort for the user's operation input.

  Further, when there is no change in the determination target image with respect to the comparison target image, power supply to the imaging unit 12, the flash memory 15, the RAM 16, and the communication interface 11 by the power supply control unit 14 is limited, so that power is always supplied. Compared to the case, the power consumed by the imaging unit 12, the flash memory 15, the RAM 16, and the communication interface 11 can be reduced. Therefore, power saving can be realized effectively.

  Further, since the power consumed by the imaging unit 12, the flash memory 15, the RAM 16 and the communication interface 11 can be reduced, compared with the case where power is always supplied to the imaging unit 12, the flash memory 15, the RAM 16 and the communication interface 11. Thus, the load on the imaging unit 12, the flash memory 15, the RAM 16, and the communication interface 11 can be reduced, and the durable life can be extended.

  When the image picked up by the image pickup unit 12 is an image picked up at night or the like, the density value of each pixel of the image is small, and when the image is not recognized, the image pickup unit 12, You may make it restrict | limit the supply of the electric power to the flash memory 15, RAM16, and the communication interface 11. FIG. More specifically, the processing unit 17 obtains the sum value of the density values of each pixel in one image stored in the flash memory 15, and the sum value of the obtained density values determines a predetermined threshold, for example, the total number of pixels × If it is determined whether or not it is less than 20, and if it is determined that it is less than the threshold value, it is determined that the captured image cannot be recognized, and the power to the imaging unit 12, flash memory 15, RAM 16, and communication interface 11 is determined. The power supply control unit 14 is controlled so as to limit the supply. The threshold value is a value when the number of gradations is 256 and the density value that cannot be determined is 20.

  As a result, the image capturing unit 12, the flash memory 15, the RAM 16 and the communication interface 11 are consumed as compared with the case where power is always supplied even though the image captured by the image capturing unit 12 cannot be recognized. Therefore, it is possible to reduce power consumption and effectively achieve power saving.

  With respect to the comparison target image and the determination target image acquired from the image stored in the flash memory 15 in step a7 of the flowchart shown in FIG. Is the image to be judged and the image having the latest date and time after the judgment target image among the images stored in the flash memory 15 is the comparison target image. It is not restricted to such an image. In another embodiment of the present invention, an image whose imaging time coincides with the current time among images stored in the flash memory 15 is used as a comparison target image, and a comparison target image among images stored in the flash memory 15 is used. Next, the image with the newest date and time may be used as the determination target image. Even in this case, the same effect as that of the above-described embodiment can be obtained.

  FIG. 3 is a flowchart showing an operation procedure of the processing unit 17 relating to power supply control based on voice. This process is repeatedly executed during the operation of the recording apparatus 1. This process is executed by the processing unit 17. In this flowchart, steps b1, b4, and b5 are the same processes as steps a1, a4, and a5, respectively, and thus description thereof is omitted.

  In step b2, the power control unit 14 performs voice input from the mode in which the power control unit 14 supplies power to the voice input unit 13, the flash memory 15, the RAM 16, and the communication interface 11 (hereinafter sometimes referred to as “normal mode”). The mode is switched to a mode that restricts the supply of power to the unit 13, the flash memory 15, the RAM 16, and the communication interface 11 (hereinafter sometimes referred to as “sleep mode”), and the process proceeds to step b3. Even in the sleep mode, unrestricted power is supplied from the power supply control unit 14 to the RTC of the processing unit 17.

  In step b3, the power control unit 14 is allowed to restrict power supply to the voice input unit 13, the flash memory 15, the RAM 16, and the communication interface 11, and the process proceeds to step b4. When the predetermined time elapses in step a4, when the mode is switched from the sleep mode to the normal mode in step b5, in step b6, the power control unit 14 supplies unrestricted power to the voice input unit 13, the flash memory 15 and the RAM 16. Then, the process proceeds to step b7.

  In step b7, a sound pressure level that is detected based on the sound input by the sound input unit 13 and stored in the flash memory 15 is obtained, and the process proceeds to step b8. In step b8, it is determined whether or not the acquired sound pressure level is a predetermined threshold, for example, 55 decibels or more. If it is 55 decibels or more, the power control unit 14 supplies unrestricted power to the communication interface 11. Then, the process proceeds to step b9, and if it is less than 55 dB, the process returns to step b1. The sound pressure level threshold is about 110 dB for a horn at a distance of 2 m from the vehicle, about 60 decibels for sound produced during conversation, and sound in a quiet residential area in the daytime. This is a value considering that the pressure level is about 40 dB.

  In step b9, it is determined whether or not there is an external input or task activation within a predetermined time, for example, within one second from the time when the sound pressure level is determined to be equal to or higher than the predetermined threshold. If activated, the process proceeds to step b10, and if not activated, the process returns to step b1. Here, the external input is, for example, a door phone call input, and the task activation is, for example, a recording task activation. In the present embodiment, the predetermined time is set to 1 second. However, if it is desired to reduce power consumption, a time longer than 1 second may be set.

  Whether or not there is an external input or task activation is determined based on whether or not a voice request signal indicating a voice request is transmitted from the data terminal devices 2 and 3 via the LAN 18. Specifically, if the processing unit 17 recognizes that the voice request signal has been transmitted from the data terminal devices 2 and 3, it is determined that there is an external input or task activation, and the voice request signal is transmitted. If it is not recognized, it is determined that there is no external input or task activation.

  In step b10, a process based on external input or task activation (hereinafter referred to as "normal process") is performed, and when the normal process ends, the process proceeds to step b11. Specifically, when the external input is a door phone call input, the voice input by the voice input unit 13 and stored in the flash memory 15 is transmitted from the communication interface 11 to the data terminal device 2 via the LAN 18. When the processing unit 17 receives a communication stop signal that is transmitted when the user of the doorphone enters the on-hook state and stops communication between the recording device 1 and the data terminal device 2, it is based on a call input of the doorphone. Normal processing ends.

  If the task activation is a recording task, the voice stored in the flash memory 15 is transmitted from the communication interface 11 to the data terminal device 3 via the LAN 18. When the processing unit 17 receives a recording stop signal for stopping the recording task, the normal process based on the activation of the recording task is terminated.

  In step b11, it is determined whether or not a predetermined time has elapsed since the time when the sound pressure level was determined to be equal to or higher than a predetermined threshold. If it has elapsed, the process returns to step b1, and if not, step b1 is performed. Returning to b9, the same processing as described above is performed.

  As described above, according to the present embodiment, when the processing unit 17 determines that the sound pressure level is equal to or higher than a predetermined threshold, the processing unit 17 supplies power to the voice input unit 13, the flash memory 15, the RAM 16, and the communication interface 11. The power supply control unit 14 is controlled as described above. If the processing unit 17 determines that the sound pressure level is less than a predetermined threshold value, the processing unit 17 controls the power supply control unit 14 so as to limit the power supply to the voice input unit 13, the flash memory 15, the RAM 16, and the communication interface 11. .

  In this way, the power supply control unit 14 is controlled based on the sound pressure level detected by the processing unit 17, and power is supplied to the voice input unit 13, flash memory 15, RAM 16, and communication interface 11, or power is supplied. Therefore, the user does not need to perform an operation input for controlling the power supply control unit 14. Therefore, it is possible to save time and effort for the user's operation input.

  When the sound pressure level is less than a predetermined threshold, power supply to the voice input unit 13, the flash memory 15, the RAM 16, and the communication interface 11 by the power supply control unit 14 is limited, so that power is always supplied. Compared to the case, the power consumed by the voice input unit 13, the flash memory 15, the RAM 16, and the communication interface 11 can be reduced. Therefore, power saving can be realized effectively.

  In addition, since the power consumed by the voice input unit 13, the flash memory 15, the RAM 16 and the communication interface 11 can be reduced, the power is always supplied to the voice input unit 13, the flash memory 15, the RAM 16 and the communication interface 11. As compared with the above, the load on the voice input unit 13, the flash memory 15, the RAM 16, and the communication interface 11 can be reduced, and the durable life can be extended.

  In the flowchart shown in FIG. 3, the sound pressure level stored in the flash memory 15 is acquired in step b7, and it is determined in step b8 whether or not the acquired sound pressure level is equal to or higher than a predetermined threshold value. However, the present invention is not limited to such a configuration, and the following configuration may be used.

  For example, in step b7, the determination target sound pressure level to be determined and the comparison target sound pressure level to be compared are acquired from the sound pressure level stored in the flash memory 15, and in step b8, the determination target sound pressure level is acquired. It is determined whether or not the absolute value of the difference between the sound pressure level and the comparison target sound pressure level is a predetermined threshold, for example, 15 decibels or more. If it is 15 decibels or more, the process proceeds to step b9. You may make it progress to. Even in such a case, power saving can be effectively realized.

  FIG. 4 is a block diagram showing the recording device 20 and the data terminal devices 2 and 3 according to the second embodiment of the present invention. Since the recording apparatus 20 of the present embodiment has a configuration similar to that of the recording apparatus 1 of the first embodiment described above, the same reference numerals are given to the configurations corresponding to the configurations of the first embodiment. Only the differences will be described. The recording device 20 includes a communication interface 11, an imaging unit 12, an audio input unit 13, a power supply control unit 14, a flash memory 15, a random access memory (RAM) 16, and a processing unit 17 that constitute the recording device 20. The wireless communication antenna 21 and the power saving control unit 22 are further provided.

  A wireless communication antenna 21 is connected to the communication interface 11, and the recording device 20 is configured to be capable of wireless communication with the data terminal devices 2 and 3 via the wireless communication antenna 21 via a wireless LAN.

  The power saving control unit 22 is a dedicated integrated circuit (abbreviation: IC) for performing power saving processing. For example, an application specific integrated circuit (abbreviation: ASIC) and a programmable logic device (Programmable Logic). Device; abbreviation: PLD). The power saving control unit 22 includes a memory and a timer for recording images, sounds, and sound pressure levels.

  The power supply control unit 14 supplies power to the communication interface 11, the imaging unit 12, the audio input unit 13, the flash memory 15, the RAM 16, the power saving control unit 22, and the processing unit 17. The flash memory 15 according to the present embodiment stores a control program for comprehensively controlling the hardware resources constituting the recording device 20.

  The power saving control unit 22 is electrically connected to the imaging unit 12, the voice input unit 13, and the processing unit 17, and incorporates an image captured by the imaging unit 12 and a voice input by the voice input unit 13. Store in memory. The power saving control unit 22 determines whether there is a change in the determination target image with respect to the comparison target image, determination processing for determining whether the sound pressure level is equal to or higher than a predetermined threshold value, and the like for each pixel of the determination target image. Processing similar to that of the processing unit 17 of the first embodiment described above, such as calculation processing for obtaining the sum of squares of the difference between the density value and the density value of each pixel of the comparison target image, is performed.

  In the present embodiment, the image selection means, determination means, calculation means, determination means, power supply control means, sound pressure level selection means, and sound pressure level detection means correspond to the power saving control unit 22.

  FIG. 5 is a flowchart illustrating a processing procedure of the power saving control unit 22 regarding power supply control based on an image. This process is repeatedly executed during the operation of the recording apparatus 20. This process is executed by the power saving control unit 22. In step c1, a setting for shifting from the sleep mode to the normal mode is performed by an external interrupt, and the process proceeds to step c2. In step c2, a notification of transition from the normal mode to the sleep mode is acquired from the processing unit 17, the normal mode is switched to the sleep mode, and the process proceeds to step c3. Even in the sleep mode, unrestricted power is supplied to the processing unit 17 from the power supply control unit 14.

  In step c3, the power control unit 14 is allowed to restrict power supply to the imaging unit 12, the flash memory 15, the RAM 16, and the communication interface 11, and the process proceeds to step c4. In step c4, a predetermined time, for example, 3 seconds is set in a timer built in the power saving control unit 22, and the process proceeds to step c5. In the present embodiment, the predetermined time is set to 3 seconds. However, when the power consumption is reduced to further save power, a time longer than 3 seconds may be set. In step c5, it is determined whether or not a predetermined time, specifically, the time set in step c4 has elapsed. If it has elapsed, the process proceeds to step c6. If not, the process waits until it elapses.

  In step c6, the power control unit 14 is caused to supply unrestricted power to the imaging unit 12, and the process proceeds to step c7. In step c7, the comparison target image and the determination target image are acquired from the image stored in the built-in memory, and the process proceeds to step c8.

  In step c8, it is determined whether there is a change in the determination target image with respect to the comparison target image. If it is determined that there is a change, the process proceeds to step c9, and if it is determined that there is no change, the process proceeds to step c10. The presence / absence of a change in the determination target image with respect to the comparison target image is determined based on a method similar to the determination method described in the first embodiment.

  In step c9, the power control unit 14 supplies unrestricted power to the imaging unit 12, flash memory 15, RAM 16, and communication interface 11, and switches from the sleep mode to the normal mode based on the interrupt signal given from the processing unit 17. Then, the process proceeds to step c11. In step c10, the power control unit 14 restricts the supply of power to the imaging unit 12, and the process returns to step c4 to perform the same process as described above.

  Steps c11 to c13 are the same processing as steps a9 to a11 in the flowchart shown in FIG. If there is no external input or activation task in step c11, the process proceeds to step c14. In step c13, if a predetermined time has elapsed from the time determined in step c8 that the determination target image has changed with respect to the comparison target image, the process proceeds to step c14. If not, the process returns to step c11. The same process as the process is performed.

  In step c14, a notification of transition from the normal mode to the sleep mode is acquired from the processing unit 17, the normal mode is switched to the sleep mode, the process returns to step c3, and the same process as described above is performed.

  As described above, according to the present embodiment, when the power saving control unit 22 determines that there is a change in the determination target image with respect to the comparison target image, the power saving control unit 22 supplies power to the imaging unit 12, the flash memory 15, the RAM 16, and the communication interface 11. The power control unit 14 is controlled so as to be supplied. If the power saving control unit 22 determines that there is no change in the determination target image with respect to the comparison target image, the power saving control unit 22 controls the power supply control unit 14 to limit the supply of power to the imaging unit 12, the flash memory 15, the RAM 16, and the communication interface 11. Control.

  Thus, based on the presence or absence of the change of the determination target image with respect to the comparison target image, the power control unit 14 is controlled to supply power to the imaging unit 12, the flash memory 15, the RAM 16, and the communication interface 11, Since the supply can be limited, the user does not need to perform an operation input for controlling the power supply control unit 14. Therefore, it is possible to save time and effort for the user's operation input.

  Further, when there is no change in the determination target image with respect to the comparison target image, power supply to the imaging unit 12, the flash memory 15, the RAM 16, and the communication interface 11 by the power supply control unit 14 is limited, so that power is always supplied. Compared to the case, the power consumed by the imaging unit 12, the flash memory 15, the RAM 16, and the communication interface 11 can be reduced. Therefore, power saving can be realized effectively.

  Further, since the power consumed by the imaging unit 12, the flash memory 15, the RAM 16 and the communication interface 11 can be reduced, compared with the case where power is always supplied to the imaging unit 12, the flash memory 15, the RAM 16 and the communication interface 11. Thus, the load on the imaging unit 12, the flash memory 15, the RAM 16, and the communication interface 11 can be reduced, and the durable life can be extended.

  FIG. 6 is a flowchart illustrating a processing procedure of the power saving control unit 22 regarding power supply control based on voice. This process is repeatedly executed during the operation of the recording apparatus 20. This process is executed by the power saving control unit 22. In this flowchart, steps d1, d2, d4, and d5 are the same processes as steps c1, c2, c4, and c5, respectively, and thus description thereof is omitted.

  In step d3, the power control unit 14 is allowed to restrict power supply to the voice input unit 13, the flash memory 15, the RAM 16, and the communication interface 11, and the process proceeds to step d4. In step d4, a predetermined time is set in the timer, and when the predetermined time elapses in step d5, in step d6, the power control unit 14 is caused to supply unrestricted power to the voice input unit 13, and the process proceeds to step d7. . In step d7, a sound pressure level that is detected based on the sound input by the sound input unit 13 and stored in the built-in memory is obtained, and the process proceeds to step d8. In step d8, it is determined whether or not the acquired sound pressure level is a predetermined threshold, for example, 55 decibels or more. If it is 55 decibels or more, the process proceeds to step d9, and if it is less than 55 decibels, the process proceeds to step d10.

  In step d9, the power control unit 14 is caused to supply unrestricted power to the voice input unit 13, the flash memory 15, the RAM 16, and the communication interface 11, and from the sleep mode to the normal mode based on the interrupt signal given from the processing unit 17. Switch to step d11. In step d10, the power control unit 14 restricts the supply of power to the voice input unit 13, and the process returns to step d4 to perform the same process as described above.

  Steps d11 to d13 are the same processing as steps a9 to a11 in the flowchart shown in FIG. If there is no external input or activation task in step d11, the process proceeds to step d14. In step d13, if the predetermined time has elapsed since the time when the sound pressure level was determined to be greater than or equal to the predetermined threshold value in step d8, the process proceeds to step d14, and if not, the process returns to step d11, and the processing described above. The same processing is performed.

  In step d14, a notification of transition from the normal mode to the sleep mode is acquired from the processing unit 17, the normal mode is switched to the sleep mode, the process returns to step d3, and the same processing as described above is performed.

  As described above, according to the present embodiment, when the power saving control unit 22 determines that the sound pressure level is equal to or higher than a predetermined threshold, power is supplied to the voice input unit 13, the flash memory 15, the RAM 16, and the communication interface 11. The power control unit 14 is controlled so as to be supplied. When the power saving control unit 22 determines that the sound pressure level is less than a predetermined threshold, the power saving control unit 22 controls the power supply control unit 14 to limit the supply of power to the voice input unit 13, flash memory 15, RAM 16, and communication interface 11. Control.

  In this way, the power control unit 14 is controlled based on the sound pressure level detected by the power saving control unit 22 to supply power to the voice input unit 13, flash memory 15, RAM 16, and communication interface 11, Therefore, the user does not need to perform an operation input for controlling the power supply control unit 14. Therefore, it is possible to save time and effort for the user's operation input.

  When the sound pressure level is less than a predetermined threshold, power supply to the voice input unit 13, the flash memory 15, the RAM 16, and the communication interface 11 by the power supply control unit 14 is limited, so that power is always supplied. Compared to the case, the power consumed by the voice input unit 13, the flash memory 15, the RAM 16, and the communication interface 11 can be reduced. Therefore, power saving can be realized effectively.

  In addition, since the power consumed by the voice input unit 13, the flash memory 15, the RAM 16 and the communication interface 11 can be reduced, the power is always supplied to the voice input unit 13, the flash memory 15, the RAM 16 and the communication interface 11. As compared with the above, the load on the voice input unit 13, the flash memory 15, the RAM 16, and the communication interface 11 can be reduced, and the durable life can be extended.

  In the flowchart shown in FIG. 6, in step d7, the sound pressure level stored in the memory built in the power saving control unit 22 is acquired, and in step d8, is the acquired sound pressure level equal to or higher than a predetermined threshold value? Although it is configured to determine whether or not, the present invention is not limited to such a configuration, and the following configuration may be used.

  For example, in step d7, the determination target sound pressure level to be determined and the comparison target sound pressure level to be compared are acquired from the sound pressure levels stored in the memory built in the power saving control unit 22, and in step d8 Then, it is determined whether or not the absolute value of the difference between the determination target sound pressure level and the comparison target sound pressure level is a predetermined threshold, for example, 15 decibels or more, and if it is 15 decibels or more, the process proceeds to step d9. If it is less, the process may proceed to step d10. Even in such a case, power saving can be effectively realized.

  Each above-mentioned embodiment is only illustration of this invention, and can change a structure within the scope of the invention. For example, in each of the embodiments described above, the imaging unit 12 and the voice input unit 13 are provided, but only one of the imaging 12 and the voice input unit 13 may be provided. Even with such a configuration, it is possible to achieve the same effects as those of the above-described embodiments.

  In each of the above-described embodiments, the case where the flash memory 15 is provided has been described. However, the present invention is not limited to the flash memory, and may be a non-volatile memory, for example, an EEPROM (Electrically Erasable and Programmable Read Only Memory). . The RAM 16 in each of the above embodiments is not limited to the SDRAM, but may be a volatile memory, and may be realized by, for example, a dynamic RAM (abbreviation: DRAM).

  Further, in each of the above-described embodiments, the case where the flash memory 15 and the RAM 16 are provided is described. However, in the other embodiments of the present invention, a nonvolatile memory such as the flash memory 15 is used as one. You may comprise only one. Even in such a case, the same effects as those of the above-described embodiments can be obtained.

1 is a block diagram showing a recording device 1 and data terminal devices 2 and 3 according to a first embodiment of the present invention. It is a flowchart which shows the operation | movement procedure of the process part 17 regarding the electric power supply control based on an image. It is a flowchart which shows the operation | movement procedure of the process part 17 regarding the electric power supply control based on an audio | voice. It is a block diagram which shows the recording device 20 and the data terminal devices 2 and 3 which are the 2nd Embodiment of this invention. It is a flowchart which shows the process sequence of the power saving control part 22 regarding the power supply control based on an image. It is a flowchart which shows the process sequence of the power saving control part 22 regarding the power supply control based on an audio | voice.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,20 Recording device 2,3 Data terminal device 11 Communication interface 12 Imaging part 13 Audio | voice input part 14 Power supply control part 15 Flash memory 16 Random access memory (RAM)
17 Processing Unit 18 Local Area Network (LAN)
21 Antenna for Wireless Communication 22 Power Saving Control Unit

Claims (7)

A recording apparatus that includes an imaging unit that captures an image, and that transmits an image captured by the imaging unit to a communication device capable of outputting the image ,
Storage means for storing the image captured by the imaging means,
Connected to the communication line, when power is supplied and a communication connecting means for communicating with the communication device via the communication line,
A power supply means for supplying power to the imaging means, the storage means and the communication connection means;
Power supply control means for controlling the power supply means;
Interrupt generating means for generating an interrupt for supplying power after elapse of a predetermined time after the supply of power is limited to the imaging means and the storage means;
Based on the determination target image to be determined among the images stored in the storage unit and the comparison target image to be compared with the determination target image, the presence or absence of a change in the determination target image with respect to the comparison target image is determined. Determination means for
The determination means determines whether there is an image request from the communication device via the communication connection means when the power supply means supplies power to the imaging means, the storage means, and the communication connection means. Has a function to determine
The power supply control means controls the power supply means to supply power to the imaging means and the storage means in response to the occurrence of an interrupt by the interrupt generation means, and then determines that there is a change by the determination means. that when the supply power to the communication connecting means, when it is determined that no change by the determination means, so as to limit the power supply to the imaging means and the storing hand stage, controls the power supply unit And
When the determination unit determines that there is no image request from the communication device after the power is supplied to the communication connection unit, the power supply control unit is configured to capture the imaging unit, the storage unit, and the communication connection unit. A recording apparatus , wherein the power supply means is controlled so as to limit supply of power to the recording medium . An image selection unit that selects a determination target image and a comparison target image from the images stored in the storage unit;
When the determination target image and the comparison target image are selected by the image selection unit, the determination unit compares the density value of each pixel of the determination target image with the density value of each pixel of the comparison target image. The recording apparatus according to claim 1, wherein when the ratio of pixels having different density values with respect to all pixels is less than a predetermined threshold, it is determined that there is no change in the determination target image with respect to the comparison target image. A calculation unit for obtaining a sum of squares of differences between the density value of each pixel of the determination target image selected by the image selection unit and the density value of each pixel of the comparison target image;
3. The recording apparatus according to claim 2, wherein the determination unit determines that there is no change in the determination target image with respect to the comparison target image when the total value obtained by the calculation unit is less than a predetermined threshold value. The calculation means obtains the sum of squares of the difference between the density value of each pixel in the predetermined area of the determination target image selected by the image selection means and the density value of each pixel in the predetermined area of the comparison target image,
4. The recording apparatus according to claim 3, wherein the determination unit determines that there is no change in the determination target image with respect to the comparison target image when the total value obtained by the calculation unit is less than a predetermined threshold value. The calculation means has a function of obtaining a sum value of density values of each pixel of the image stored in the storage means,
A judgment means for judging whether a total value of the density values obtained by the computing means is less than a predetermined threshold;
When the sum value of the density values is determined to be less than the predetermined threshold value by the determination means, the power supply control means, so as to limit the power supply to the imaging means and the storing hand stage, controls the power supply unit The recording apparatus according to claim 3. A recording apparatus comprising voice input means for inputting voice, and transmitting the voice input by the voice input means to a communication device capable of outputting voice ,
Storage means for storing the voice inputted by said voice input means,
Connected to the communication line, when power is supplied and a communication connecting means for communicating with the communication device via the communication line,
A power supply means for supplying power to said audio input means, said storage means and the communication connection means;
Power supply control means for controlling the power supply means;
Interrupt generation means for generating an interrupt for supplying power after a predetermined time has elapsed since the supply of power was restricted to the voice input means and the storage means;
And sound pressure level detecting means for detecting a sound pressure level which represents the intensity of the sound to be stored in the storage means,
And a determining means for determining whether the sound pressure level detecting means is detected by the sound pressure level is above the predetermined threshold value,
The determination means determines whether there is a voice request from the communication device via the communication connection means when the power supply means supplies power to the voice input means, the storage means, and the communication connection means. Has a function to determine
The power supply control means controls the power supply means to supply power to the voice input means and the storage means in response to the occurrence of an interrupt by the interrupt generation means, and then the sound pressure level is determined by the determination means. If it is determined to be previously defined threshold value or more, the supply power to communication connection unit, the sound pressure level is determined to be less than a predetermined threshold by the determination unit, the voice input means and the storing hand so as to limit the power supply to the stage, and controls the power supply unit,
When the power supply control means determines that there is no voice request from the communication device after the power is supplied to the communication connection means, the voice input means, the storage means and the communication connection A recording apparatus for controlling the power supply means so as to limit supply of power to the means . The storage means further stores the sound pressure level detected by the sound pressure level detection means,
A sound pressure level selecting means for selecting a determination target sound pressure level to be determined and a comparison target sound pressure level to be compared from the sound pressure levels stored in the storage means;
In the determination unit, when the determination target sound pressure level and the comparison target sound pressure level are selected by the sound pressure level selection unit, the absolute value of the difference between the determination target sound pressure level and the comparison target sound pressure level is equal to or greater than a predetermined threshold value. Has a function to determine whether or not
The power supply control means
If the absolute value by the determination means is determined to be equal to or larger than the predetermined threshold value, and supplies power to the communication connection unit,
If the absolute value by the determination means is determined to be less than a predetermined threshold, so as to limit the power supply to the audio input means and said memory hand stage, and controlling the power supply means The recording apparatus according to claim 6 .

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