JP4194253B2 - Digital camera - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a digital camera, and more particularly to a digital camera that performs power saving control.
[0002]
[Prior art]
Conventionally, as an information processing apparatus such as a personal computer, there is known a personal computer that can determine a driving power source and change a driving frequency when an AC adapter is used and when a battery is used. Further, it is known that an information processing apparatus such as a personal computer is turned off when it is not used for a certain period of time. Further, CPUs used in personal computers and the like are known in which an oscillation circuit is incorporated and the drive frequency can be changed by software.
[0003]
[Problems to be solved by the invention]
However, the driving frequency of the CPU of a conventional digital still camera is generally fixed by hardware. Here, although the processing capacity and power consumption of the CPU are proportional to the drive frequency, the required processing capacity differs depending on the content of the process, and other capacity is required to select the drive frequency at the maximum capacity. The processing that did not consume wasted power.
[0004]
In addition, power is wasted when there is no processing. When the remaining amount of the battery is low, there is no peak electric power, so even if the remaining amount is present, the battery is quickly ended. A large capacity power supply was required for the maximum power consumption of the PC card and CPU.
[0005]
The present invention has been made in view of the above points, and an object of the present invention is to provide a digital camera capable of extending the battery duration by realizing power saving and suppressing power consumption. It is said.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems and achieve the object, a digital camera according to the present invention includes a CPU that controls the entire apparatus, an oscillation circuit that can change a drive frequency of the CPU, and a communication unit between external devices. And changing the drive frequency of the CPU based on the processing contents of the CPU using the oscillation circuit, and using the oscillation circuit based on the communication speed during communication with the external device. The drive frequency is changed.
[0007]
The digital camera according to the present invention further includes a CPU that controls the entire apparatus, an oscillation circuit that can change a drive frequency of the CPU, and a storage unit that stores data, and the CPU using the oscillation circuit. The CPU drive frequency is changed based on the contents of the process, and the CPU drive frequency is changed during the access to the storage means using the oscillation circuit.
[0008]
The digital camera according to the present invention further includes a CPU that controls the entire apparatus, an oscillation circuit that can change a drive frequency of the CPU, and a memory card connection unit that connects the memory card. The drive frequency of the CPU is changed based on the processing contents of the CPU, and the drive frequency of the CPU is changed using the oscillation circuit during access to the memory card by the memory card connection means. And
[0009]
The digital camera of the present invention comprises a CPU for controlling the entire apparatus, an oscillation circuit capable of changing the drive frequency of the CPU, and a PC card connection means for connecting to a PC card, and using the oscillation circuit. The CPU drive frequency is changed based on the processing contents of the CPU, and the CPU drive frequency is changed during the access to the PC card by the PC card connecting means using the oscillation circuit. And
[0010]
The digital camera of the present invention comprises a CPU for controlling the entire apparatus, an oscillation circuit capable of changing the drive frequency of the CPU, and a CF card connection means for a CF (Compact Flash) card. A CPU is used to change the CPU driving frequency based on the processing contents of the CPU, and the oscillation circuit is used to change the CPU driving frequency while the CF card connecting means is accessing the CF card. It is characterized by doing.
[0011]
According to the present invention, power consumption can be suppressed by selecting an optimum CPU processing capacity.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
Exemplary embodiments of a digital camera according to the present invention will be described below in detail with reference to the accompanying drawings.
[0033]
(Hardware configuration)
FIG. 1 is a block diagram showing a hardware configuration of a digital camera which is a digital camera according to the present invention.
[0034]
In FIG. 1, reference numeral 100 denotes a digital camera. The digital camera 100 includes an imaging lens (system) 101, a mechanical mechanism 102 including a diaphragm / filter unit, a CCD (charge coupled device) 103, and a CDS circuit 104. An A / D converter 105, a digital signal processing unit 106, an image display memory (DRAM) 107, an image display control unit 108, a compression / decompression 109, a touch panel I / F 110, an LCD 111, and a touch panel 112. And.
[0035]
The digital camera 100 also includes a CPU 121, a ROM 122, a RAM 123, a memory card 124, a USB control unit 125, an operation unit 126, a battery detection unit 127, an SG (control signal generation unit) 130, and a zoom driver. And a driver 131 including a focus driver, an aperture, a shutter driver, and the like.
[0036]
The lens unit includes a mechanical mechanism 102 including an imaging lens (system) 101, autofocus, a diaphragm / filter unit, and the like. The mechanical shutter of the mechanical mechanism 102 performs simultaneous exposure of two fields. The imaging lens (system) 101 is composed of, for example, a vari-focus lens, and includes a zoom lens system 101a and a focus lens system 101b.
[0037]
A CCD (charge coupled device) 103 converts an image input via the lens unit into an electrical signal (analog image data). A CDS (correlated double sampling) circuit 104 is a circuit for reducing noise in the CCD type image pickup device.
[0038]
Similarly, although not shown in the figure, an AGC amplifier that corrects the level of the signal subjected to correlated double sampling in the CDS circuit 104 may be included. The gain of the AGC amplifier is set by the CPU 121 when setting data (control voltage) is set in the AGC amplifier via a D / A converter built in the AGC amplifier.
[0039]
Similarly, an A / D (converter) 105 converts analog image data from the CCD 103 input via the AGC amplifier into digital image data. That is, the output signal of the CCD 103 is a digital signal at an optimum sampling frequency (for example, an integer multiple of the subcarrier frequency of the NTSC signal) via the CDS circuit 104 and the AGC amplifier and by the A / D (converter) 105. Is converted to
[0040]
Further, a digital signal processing unit (IPP (Image Pre-Processor)) 106 and a compression / decompression unit 109 perform color difference (Cb, Cr) and luminance (Y) on digital image data input from an A / D (converter) 105. ) To perform various processing, correction, and data processing for image compression / decompression.
[0041]
The compression / decompression unit 108 performs, for example, orthogonal transformation / inverse orthogonal transformation, which is a process of JPEG-compliant image compression / decompression, and Huffman encoding / decoding, which is a process of JPEG-compliant image compression / decompression. .
[0042]
The digital signal processing unit 106 detects luminance data (Y) of the image data and outputs an AE evaluation value corresponding to the detected luminance data (Y) to the CPU 121. This AE evaluation value indicates the luminance (brightness) of the subject. Further, the digital signal processing unit 106 outputs an AWB (Auto White Balance) evaluation value corresponding to each luminance data (Y) of the R, G, and B image data to the CPU 121 within the set color temperature range. This AWB evaluation value indicates the color component of the subject.
[0043]
In addition, the image display control unit 109 performs monitor image display and reproduction display of captured images. It also controls to display image data, operation menus, and the like. Also, display control is performed for the state of the set digital still camera, for example, the set mode display and error display.
[0044]
An LCD (Liquid Crystal Display) 111 is a reflective LCD arranged on the viewing side, and displays image data, an operation menu, and the like. The touch panel 112 outputs coordinates touched with a touch pen or the like.
[0045]
The CPU 121 uses the RAM 123 (not shown) as a work area according to a control program stored in the ROM 122 based on an instruction from the operation unit 126 or an external operation instruction such as a remote controller (not shown). Perform overall control. Specifically, the CPU 121 performs various controls such as an imaging operation, automatic exposure (AE) operation, automatic white balance (AWB) adjustment operation, AF operation, and display.
[0046]
The CPU 121 also records a recording mode in which image data obtained by capturing an image of the subject is recorded in the memory card 124, a playback mode in which the image data recorded in the memory card 124 is reproduced and displayed on the LCD 111, and a captured monitoring image. Is provided on the LCD 111 directly. That is, the CPU has functions such as recording control means, reproduction control means, notification means, and data processing means.
[0047]
The image display memory 107 is logically composed of a plurality of planes. In the image display control, the respective planes are superimposed to perform composite display, and when overlapping, the display position, display magnification, luminance, transmission attribute, and the like are controlled for each plane.
[0048]
In addition, as a display mode when an image is displayed on the LCD 111 in the playback mode or the monitoring mode, a fixed mode, an external light adaptive mode, an auxiliary light use mode, and a maximum contrast mode are provided. Is done by.
[0049]
Note that an oscillation circuit that changes the drive frequency of the CPU 121 may be built in the CPU 121 in advance, or may be provided outside the CPU 121 and input to the CPU 121 from there.
[0050]
The memory card 124 records (writes) or reads a compressed image once stored in an MCC (Memory Card Controller) (not shown) via a card interface (not shown).
[0051]
A USB (Universal Serial Bus) control unit 125 controls an interface in USB, which is a serial interface standard. There are two types of USB, a low-speed mode of 1.5 Mbps and a high-speed mode of 12 Mbps.
[0052]
In addition to the USB, the communication means may be configured by serial, parallel, LAN, wireless, an interface with a mobile phone, or the like. Further, it is possible to adopt a configuration in which communication means can be exchanged by using an I / F for a PC card or a non-volatile CF (Compact Flash) card.
[0053]
The operation unit 126 includes buttons for performing function selection, shooting instruction, and various other settings from the outside. The above buttons may be realized on the touch panel 112.
[0054]
The battery detection unit 127 detects the remaining amount of the battery of the digital camera 100 and outputs the remaining amount information to the CPU 121. Although not shown, the battery that is the target of the battery detection unit 127 is used as a camera power source, and includes, for example, a nickel metal hydride battery, a lithium ion battery, a NiCd battery, and an alkaline battery. , And supplied to the inside of the digital camera 100 via a DC / DC converter (not shown).
[0055]
A zoom driver among the drivers 131 can drive a pulse motor, which is a zoom motor, in accordance with a control signal supplied from the CPU 121 to move the zoom lens system in the optical axis direction. Further, the focus driver of the driver 131 can drive a pulse motor, which is a focus motor, in accordance with a control signal supplied from the CPU 121 to move the focus lens system in the optical axis direction.
[0056]
The diaphragm / shutter driver of the driver 131 drives a pulse motor which is a diaphragm / shutter motor that operates the mechanical mechanism 102 in accordance with a control signal supplied from the CPU 121, for example, to obtain an aperture value of the diaphragm. Set.
[0057]
(Configuration of control program (software))
FIG. 2 is an explanatory diagram showing a configuration of a control program for controlling the digital camera according to the embodiment of the present invention. In FIG. 2, the control program is composed of a real-time operating system (RTOS) 213, peripheral device driver (D / D), middleware such as image processing and communication protocol, and applications corresponding to each mode such as shooting, playback, and communication. Is done.
[0058]
An RTOS (Real Time Operation System) 213 manages resources such as a CPU, a memory, a timer, each device, and controls the execution of tasks. Control of task execution is determined based on the priority and execution time set for each task, and is scheduled by an event such as an interrupt or a system call.
[0059]
A D / D (device driver) allows an application or middleware to access each device, and performs exclusive control of access if necessary. The drive frequency of the CPU 121 is changed by setting the frequency control register of the oscillation circuit. This process is performed by the FRQC device driver and can be called by an application, middleware, or another device driver. This driver can also prohibit frequency changes. For example, when x1 to x8 can be set, x1 to x4 are allowed and x5 to x8 are prohibited.
[0060]
The middleware is a group of processes such as image compression / decompression, file header creation, communication protocol, and the like, and is called and executed by one or more applications. The operating frequency control module is called from the RTOS 213 when a task is switched. This module manages the operating frequency for each task, and switches the operating frequency by FRQCD / D (device driver).
[0061]
An application is a group of processes for realizing each operation mode, and is executed by one or more tasks. A task is activated as necessary when the system is activated, and execution is controlled by the RTOS 213.
[0062]
The applications include, for example, applications such as an overall control application (application) 201, a communication application (application) 202, a setup application (application) 203, a reproduction application (application) 204, and a photographing application (application) 205.
[0063]
The overall control application (application) 201 is a program for performing communication and monitoring between various applications.
[0064]
A communication application (application) 202 is a program that provides an operator with means for specifying an operation related to data transmission / reception. A setup application (application) 203 is a program that provides the operator with means for setting the operation of the entire apparatus. A reproduction application (application) 204 is a program that provides an operator with means for designating the operation of the apparatus when reproducing captured data. A photographing application (application) 205 is a program that provides the operator with means for specifying the operation of the apparatus when photographing.
[0065]
The middleware program includes programs such as an operating frequency control module 206, a drawing module 207, an image processing module 208, a communication protocol module 209, a file management module 210, a battery monitoring module 211, and a camera control module 212, for example.
[0066]
The operating frequency control module 206 manages the operating frequency for each task, and switches the operating frequency by FRQCD / D (device driver) 219. The drawing module 207 is called from the reproduction application (application) 204 at the time of reproduction and transmits image data to the DSPD / D (device driver) 223.
[0067]
The image processing module 208 performs processing such as noise removal on the image data. A communication protocol module 209 performs communication protocol processing when image data or the like is transmitted / received via a network. The file management module 210 performs processing of saving image data, image data information, various setting information, and the like in a file and reading from the file. The battery monitoring module 211 performs a process of monitoring the state of the power supply of the apparatus and displaying the state on an indicator or the like, or displaying a warning when the remaining amount of power is low. The camera control module 212 performs a process of notifying each device of an appropriate state of the device in the apparatus according to the shooting situation and the setting contents of the operator.
[0068]
The RTOS 213 manages resources such as the CPU 121, memory, timer, and devices, and controls the execution of tasks.
[0069]
The device drivers include a communication D / D (device driver) 214, a card D / D (device driver) 215, a battery D / D (device driver) 216, a mechanical D / D (device driver) 217, and a timer D / D. (Device driver) 218, FRQCD / D (device driver) 219, TPD / D (device driver) 220, SWD / D (device driver) 221, SGD / D (device driver) 222, DSPD / D (device driver) 223 CODECD / D (device driver) 224 and the like.
[0070]
A communication D / D (device driver) 214 exchanges signals between the communication device and the RTOS 213. A card D / D (device driver) 215 exchanges signals between the PC card and the RTOS 213. A battery D / D (device driver) 216 exchanges signals between the power supply device and the RTOS 213.
[0071]
A mechanical D / D (device driver) 217 exchanges signals between the RTOS 213 and a device such as a zoom or a shutter. A timer D / D (device driver) 218 exchanges signals between the time measuring device and the RTOS 213. An FRQCD / D (device driver) 219 sets a CPU driving frequency.
[0072]
A TPD / D (device driver) 220 exchanges signals between the touch panel and the RTOS 213. The SWD / D (device driver) 221 transmits and receives signals between the switch provided in the operation unit 126 and the RTOS 213. An SGD / D (device driver) 222 exchanges signals between the video memory and the RTOS 213.
[0073]
A DSPD / D (device driver) 223 exchanges signals between the display device and the RTOS 213. CODECD / D (device driver) 224 exchanges signals between the image data compression / decompression circuit and RTOS 213.
[0074]
By configuring in this way, the drive frequency of the CPU 121 is changed based on the contents of the software recorded in the own device using an oscillation circuit capable of changing the drive frequency of the CPU 121 that controls the entire device. Can do.
[0075]
Further, it is possible to change the drive frequency based on the processing content of the CPU 121 using an oscillation circuit. At this time, the drive frequency can be increased during the arithmetic processing by the CPU 121, and the drive frequency can be decreased during idle.
[0076]
Further, the drive frequency of the CPU 121 can be changed based on the operation mode in which the device itself operates. In addition, the drive frequency of the CPU 121 can be changed based on the battery level of the device itself.
[0077]
Furthermore, the drive frequency during communication with an external device using the USB control unit 125 or the like can be changed. At that time, the drive frequency can be changed based on the communication speed during communication with the external device.
[0078]
Further, it is possible to change the drive frequency during access to the storage means such as the memory card 124. In addition to the memory card 124, access to a PC card or a CF card may be used.
[0079]
Further, the number of tasks being executed may be counted, and the drive frequency of the CPU 121 may be changed based on the counted number of tasks.
[0080]
Further, the driving of the CPU 121 may be stopped based on the contents of the software recorded in the own apparatus, and the driving of the CPU 121 stopped by the interrupt process may be restarted. In particular, the driving of the CPU 121 may be stopped during an idle task.
[0081]
(Runtime task configuration)
Next, a task configuration at the time of execution of processing of the digital camera according to the embodiment of the present invention will be described. FIG. 3 is an explanatory diagram showing a task configuration when executing processing of the digital camera according to the embodiment of the present invention.
[0082]
In FIG. 3, the tasks of the digital camera are composed of an overall control task, a camera task, a communication task, a file task, and an idle task. The task IDs are the overall control task = 1, the camera task = 2, the communication task = 3, and the file, respectively. Task = 4 and idle task = 5 are assigned.
[0083]
As shown in FIG. 3, the priority of “overall control task (task ID = 1)” is the highest, and the priority of “idle task (task ID = 5)” is the lowest. The “overall control task (task ID = 1)” is activated by the system timer, and the remaining battery level is monitored by the operation unit 126, the touch panel 112, and the battery detection unit 127.
[0084]
“Camera task (task ID = 2)” is activated by a synchronization signal and performs various signal processing.
[0085]
“Communication task (task ID = 3)” transmits and receives data to and from an external device.
[0086]
“File task (task ID = 4)” reads or writes data to a file, for example, the memory card 124.
[0087]
The “idle task (task ID = 5)” is a task that is executed when there is no other task being executed. The “idle task (task ID = 5)” can suppress power consumption by setting its own operating frequency to a minimum.
[0088]
The function of switching tasks with the RTOS function is called a dispatcher. The dispatcher transfers control to tasks that can be executed in order of priority. The operating frequency of each task can be switched according to the processing within each task. The operating frequency control module stores the ID and operating frequency of the current task in a table as shown in FIG. 4, and sets the operating frequency when this task has been executed previously from the ID of the task to be executed next.
[0089]
FIG. 4 is an explanatory diagram showing a table in which information on the operating frequency for each task ID is stored. In FIG. 4, task ID = “5” is “idle task”, and in this case, the lowest operating frequency is set to “1”. Next, task ID = “1” is an overall control task, and in this case, “2” is set as the operating frequency. This “2” means that the operating frequency is twice (x2) the above “1”.
[0090]
Similarly, when task ID = “2” (camera task), the highest operating frequency is “6”, and when task ID = “3” (communication task), the operating frequency is “4”, task ID = "4" (file task) indicates that the operating frequency is set to "3".
[0091]
In this way, if the operating frequency is set for each application, the mode can be switched between the shooting mode and the playback mode.
[0092]
If the operating frequency is changed inside the middleware module or inside the device driver, it is possible to make settings suitable for the processing content. For example, the speed is increased if high-speed computation is required, and the speed is decreased for I / O to a low-speed device. For example, different settings can be made for memory reading and writing, and the required processing capacity can be set according to the communication speed during communication.
[0093]
Further, since the power consumption of the card is used as information in the PC card and the CF card, the power consumption of the entire system can be controlled by the installed card.
In the idle task, the driving of the CPU may be stopped instead of setting the operating frequency low. When processing is divided into a plurality of tasks and parallel processing is performed, the drive frequency may be changed according to the number of tasks waiting to be processed.
[0094]
【The invention's effect】
As described above, according to the first aspect of the present invention, the CPU includes the CPU that controls the entire apparatus, and the oscillation circuit that can change the drive frequency of the CPU, and using the oscillation circuit, In order to change the CPU drive frequency based on the contents of the software recorded in the device itself, it is possible to save power by selecting the optimum processing capacity and to reduce power consumption. There is an effect that a digital camera capable of extending the duration can be obtained.
[0095]
According to a second aspect of the invention, in the first aspect of the invention, an optimum processing capability is achieved by changing the drive frequency based on the processing contents of the CPU using the oscillation circuit. By selecting, power consumption can be suppressed. By realizing power saving and suppressing power consumption, there is an effect that a digital camera capable of extending the duration of the battery can be obtained.
[0096]
According to a third aspect of the present invention, in the second aspect of the present invention, using the oscillation circuit, the drive frequency is increased during arithmetic processing by the CPU, and the drive frequency is decreased during idle. As a result, power consumption can be suppressed while increasing the processing speed. By realizing power saving and suppressing power consumption, there is an effect that a digital camera capable of extending the battery duration can be obtained.
[0097]
According to the invention of claim 4, in the invention of claim 2, by using the oscillation circuit, the drive frequency of the CPU is changed based on an operation mode in which the device operates. The power consumption can be suppressed by selecting the optimum processing capacity. By realizing power saving and suppressing power consumption, there is an effect that a digital camera capable of extending the duration of the battery can be obtained.
[0098]
According to the invention of claim 5, in the invention of claim 2, by using the oscillation circuit, by changing the drive frequency of the CPU based on the remaining battery level of the device itself. The power consumption can be suppressed by selecting the optimum processing capacity. By realizing power saving and suppressing power consumption, there is an effect that a digital camera capable of extending the duration of the battery can be obtained.
[0099]
According to the invention described in claim 6, in the invention described in claim 2, further comprising means for communicating with an external device, and the oscillation circuit is used to communicate with an external device by the communication means. By changing the driving frequency during communication, power consumption can be suppressed by selecting an optimum processing capability. By realizing power saving and suppressing power consumption, there is an effect that a digital camera capable of extending the duration of the battery can be obtained.
[0100]
According to the invention of claim 7, in the invention of claim 6, by using the oscillation circuit, by changing the drive frequency based on the communication speed during communication with the external device, The power consumption can be suppressed by selecting the optimum processing capacity. By realizing power saving and suppressing power consumption, there is an effect that a digital camera capable of extending the duration of the battery can be obtained.
[0101]
According to the invention described in claim 8, in the invention described in claim 2, further comprising a storage means for storing data, and using the oscillation circuit, the drive frequency during access to the storage means By changing the above, it is possible to suppress power consumption by selecting an optimum processing capability. By realizing power saving and suppressing power consumption, there is an effect that a digital camera capable of extending the duration of the battery can be obtained.
[0102]
According to the invention described in claim 9, in the invention described in claim 2, further comprising a memory card connection means with a memory card, and the memory by the memory card connection means using the oscillation circuit. By changing the drive frequency during access to the card, power saving can be realized, and by selecting the optimum processing capacity, the power consumption can be suppressed, so that the battery duration can be extended. There is an effect that a digital camera can be obtained.
[0103]
According to the invention of claim 10, in the invention of claim 2, further comprising a PC card connection means with a PC card, and the PC by the PC card connection means using the oscillation circuit. By changing the drive frequency during access to the card, power saving is realized, and by selecting the optimal CPU power consumption, the power consumption is reduced, thereby extending the battery duration. It is possible to obtain a digital camera capable of the above.
[0104]
According to the invention of claim 11, in the invention of claim 2, further comprising a CF card connection means with a CF card, and using the oscillation circuit, the CF card connection means uses the CF card connection means. By changing the drive frequency during access to the card, power consumption can be suppressed by selecting the optimum processing capability. By realizing power saving and suppressing power consumption, there is an effect that a digital camera capable of extending the battery duration can be obtained.
[0105]
According to a twelfth aspect of the present invention, in the second aspect of the invention, the number of tasks counted by the counting means using the counting means for counting the number of tasks being executed and the oscillation circuit. By changing the drive frequency of the CPU based on the above, it is possible to suppress power consumption by selecting an optimum processing capability. By realizing power saving and suppressing power consumption, there is an effect that a digital camera capable of extending the duration of the battery can be obtained.
[0106]
According to a thirteenth aspect of the present invention, a CPU for controlling the entire apparatus is provided, the CPU is stopped based on the contents of software recorded in the apparatus, and interrupt processing is performed. By resuming the driving of the CPU stopped by the above, power saving can be realized, and by suppressing the power consumption while increasing the processing speed, a digital camera capable of extending the battery duration can be obtained. There is an effect.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a hardware configuration of a digital camera according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram showing a configuration of a control program for controlling the digital camera according to the embodiment of the present invention.
FIG. 3 is an explanatory diagram showing a task configuration when executing processing of the digital camera according to the embodiment of the present invention;
FIG. 4 is an explanatory diagram showing a table in which information regarding the operating frequency for each task ID of the digital camera according to the embodiment of the present invention is stored.
[Explanation of symbols]
100 digital camera
101 Photography lens
102 Mechanical mechanism including autofocus
103 CCD (Charge Coupled Device)
104 CDS
105 A / D (converter)
106 Digital signal processor
107 Image display memory
108 Image display controller
109 Compression / decompression unit
110 Touch panel I / F
111 LCD
112 Touch panel
121 CPU
122 ROM
123 RAM
124 memory card
125 USB controller
126 Operation unit
127 battery detector
130 SG
131 drivers
201 Overall control application
202 Communication application
203 Setup application (application)
204 Playback application
205 Photography application
206 Operating frequency control module
207 Drawing module
208 Image processing module
209 Communication protocol module
210 File management module
211 Battery monitoring module
212 Camera control module
213 RTOS (Real Time Operation System)
214 Communication D / D (Device Driver)
215 Card D / D (device driver)
216 Battery D / D (device driver)
217 Mechanical D / D (device driver)
218 Timer D / D (device driver)
219 FRQCD / D (device driver)
220 TPD / D (device driver)
221 SWD / D (device driver)
222 SGD / D (device driver)
223 DSPD / D (device driver)
224 CODECD / D (device driver)

Claims (5)

A CPU that controls the entire device,
An oscillation circuit capable of changing the drive frequency of the CPU;
Communication means with external equipment,
Using the oscillation circuit, the CPU driving frequency is changed based on the processing contents of the CPU, and using the oscillation circuit, the CPU driving frequency is changed based on the communication speed during communication with the external device. A digital camera characterized by that. A CPU that controls the entire device,
An oscillation circuit capable of changing the drive frequency of the CPU;
Storage means for storing data,
The drive frequency of the CPU is changed based on the processing contents of the CPU using the oscillation circuit, and the drive frequency of the CPU is changed during access to the storage means using the oscillation circuit. digital camera. A CPU that controls the entire device,
An oscillation circuit capable of changing the drive frequency of the CPU;
A memory card connecting means with a memory card,
The CPU driving frequency is changed based on the processing contents of the CPU using the oscillation circuit, and the CPU driving frequency during the access to the memory card by the memory card connection means using the oscillation circuit. A digital camera characterized by changing A CPU that controls the entire device,
An oscillation circuit capable of changing the drive frequency of the CPU;
PC card connection means with a PC card,
The CPU driving frequency is changed based on the processing contents of the CPU using the oscillation circuit, and the CPU driving frequency during the access to the PC card by the PC card connecting means using the oscillation circuit. A digital camera characterized by changing A CPU that controls the entire device,
An oscillation circuit capable of changing the drive frequency of the CPU;
CF card connection means with a CF (Compact Flash) card,
The CPU drive frequency is changed based on the processing contents of the CPU using the oscillation circuit, and the CPU drive frequency during the access to the CF card by the CF card connecting means using the oscillation circuit. A digital camera characterized by changing

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