JP2009123320A - Information recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information recording device capable of reducing a power consumption by changing a memory assignment in accordance with a fixed state of the device. <P>SOLUTION: The device includes: a shock-proof memory 3-2; a buffer memory 3-1; a drive controller 6 for recording information data of the buffer memory 3-1 to a disk recording medium; a system controller 5 for controlling a start and stop of the recording in accordance with an information data accumulating amount of the buffer memory 3-1; a fixing state detecting means 1 for determining whether the device is being fixed; and a memory control section 2 for assigning the buffer memory 3-1 and the shock-proof memory 3-2. The power consumption can be cut down by reducing the number of intermittent recording times in the manner of increasing capacity of the buffer memory 3-1 in accordance with that the fixed state of the device is detected by the fixing state detecting means 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an information recording apparatus for recording video and audio on an information recording medium, and can be suitably used particularly for a video camera using a DVD or a BD drive.

  In recent years, products that record video and audio by mounting an optical disk and a hard disk drive in a video camera by media change from DVC have been put on the market. In particular, in the case of an optical disk, unlike a tape such as DVC, the servo is likely to come off due to vibration or impact. If the servo is lost, the focus and tracking must be pulled in again, and it takes time to recover. Therefore, even when the servo is lost and recording is temporarily impossible, the data in the shock proof memory is re-recorded after recovery after the servo recovery, thereby maintaining continuity during data recording.

In order to reduce power consumption, input data is temporarily stored in the buffer memory by taking advantage of the high transfer speed of the optical disk, and data is read from the buffer memory and recorded on the optical disk. An intermittent recording system that secures a waiting time to turn off the motor and laser is realized.

In the conventional technology, the capacity of the shock proof memory is suppressed, and the standby time is lengthened to reduce the power consumption. Therefore, when an impact or vibration occurs, the input data is switched to a lower rate, and the recording is performed at a higher rate. A configuration for switching is proposed (see Patent Document 1).
JP 2006-79755 A

  In recent years, due to the higher sound quality and higher image quality of video cameras, the transfer rate for recording has increased, so the amount of data to be recorded per unit time has increased. For example, video cameras that normally recorded at 6 Mbps only in the SD mode are now available on the market, and video cameras that can record in the HD mode of 12 Mbps are now on the market. However, in the HD mode, only 5 seconds of intermittent recording can be performed.

  On the other hand, since the recovery operation accompanied by the servo recovery involves the care of the mechanical operation and the collision, it is difficult to significantly reduce the recovery time such as the focus pull-in, tracking, and relearning.

  For this reason, it is necessary to secure a large amount of shock proof memory in the conventional example, the amount of buffer memory used for the intermittent recording operation is reduced, and the recording frequency is increased, so that the power consumption is increased and the recording time (shooting time) is increased. ) Will be shortened and frequent battery replacement will be required, or a large battery will be installed, resulting in a heavy device, which will hinder the ease of use of conventional video cameras. It was.

  The present invention solves the above-described conventional problems, and is a shooting state in a fixed state with a tripod or the like, a shooting state while moving with a hand carry, and a hand carry, but in a stable state sitting on a chair or the like. An object of the present invention is to provide a convenient information recording device that realizes the extension of the shooting time with high image quality by detecting the usage state of the device such as shooting and reducing the power consumption according to the user's scene. To do.

In order to solve the conventional problem, the information recording apparatus of the present invention includes:
An information recording apparatus for recording video or / and audio as data on an information recording medium,
Memory means for temporarily storing the data before recording it on the information recording medium, and dividing the memory means into a first memory area used as a shock proof and a second memory area used as a buffer A memory allocating unit to be arranged and a fixed detecting unit for detecting that the information recording device is fixed;
The memory allocating means is configured to switch the division ratio of the memory means in accordance with a detection signal of the fixed detection means.

  Further, when the detection signal of the fixed detection means is on the fixed side, the memory allocation means may be configured to switch the division ratio so as to reduce the ratio of the first memory area to the second memory area. preferable.

Further, when the memory allocation means detects that the division ratio between the second memory area and the first memory area is not fixed (data transfer rate × minimum intermittent recording time) / total capacity of the memory means or less 1− (data transfer rate × recovery time) / total capacity of the memory means It is preferable that the maximum division ratio is 1 when it is determined to be equal to or larger than that and when it is detected as fixed.

  Furthermore, it is preferable that a gain control means for setting a servo gain of the information recording apparatus is provided, and the setting of the gain control means is switched to a low gain in accordance with a signal from the fixed detection means.

  Further, it is preferable that the fixed detection means is a switch configured to be turned on / off when a tripod is used, or a switch that can be set and released according to a user's intention.

  According to the information recording apparatus of the present invention, the use efficiency of the memory is optimized by detecting whether it is fixed with a tripod or the like, and appropriately switching the distribution between the shock proof memory and the buffer memory, and the number of recordings per unit time By reducing the power consumption, the power consumption can be reduced. Because of this effect, for example, if you set up a tripod, such as a piano recital or birdwatching, and sit down for a long time, the buffer memory allocation will be maximized, even if it is not frequently replaced in the middle of the battery In a scene such as an athletic meet in a sports event where shooting is performed by hand carry while moving, a shockproof memory is sufficiently secured, and the convenience that does not miss the best scene for a moment becomes apparent. Furthermore, by determining the fixed state detection based on image analysis at the previous time or at the start of recording, it is possible to realize an apparatus that can automatically perform optimal memory allocation in each scene.

Embodiments of an information recording apparatus of the present invention will be described below in detail with reference to the drawings.
(Embodiment 1)
FIG. 1 is a block diagram showing the configuration of the information recording apparatus in the first embodiment of the present invention.

  In FIG. 1, video data shot by an imaging unit 108 including an imaging lens and a CCD (or CMOS sensor) is compressed by a video compression unit 106 using a standard compression method such as MPEG2 or MPEG4. The compressed data is transferred to the built-in memory unit 3 through the internal bus under the control of the system controller 5 and temporarily stored.

  Further, the system controller 5 sends a recording instruction to the drive controller 6 to modulate the data in the memory unit 3 using a modulation / demodulation means 105 by a predetermined modulation method such as EFM, 1-7, etc., and an optical pickup control means At 103, a recording signal is generated according to the modulated data, and a laser (not shown) mounted on the optical pickup 102 is pulsed to record data on the disk recording medium 101.

  The recording method includes phase change recording in which pits are formed by changing the organic dye layer and the substrate with pulse-modulated laser light, or data is recorded by changing the recording film from an amorphous state to a crystalline state. Although it is main, it is not directly related to the present invention, and therefore the description thereof is omitted.

  The drive controller 6 controls the spindle motor 104 using the servo control unit 10 to rotate the disk recording medium 101 at a rotation speed suitable for recording. The servo control unit 10 also controls the optical pickup control unit 103.

  The system controller 5 transfers the data compressed by the video compression unit 106 to the memory unit 3. The memory unit is usually composed of a DRAM, and the memory control unit 2 in the system controller 5 can arbitrarily set the allocation to the shock proof and the allocation to the buffer by switching each allocated address.

  The input data to the memory unit is input to the shock proof memory 3-2 until a predetermined empty area is created in the buffer memory 3-1. The shock proof memory is a first-in first-out memory that holds the input data. Therefore, the data once input to the shock proof memory 3-2 in the memory unit is transferred to the buffer memory 3-1 in the memory when the free capacity of the buffer memory 3-1 becomes equal to or more than a predetermined value, and the system controller 5 Detects that the free capacity of the buffer memory 3-1 has fallen below a predetermined threshold, and instructs the drive controller 6 to start recording. When receiving a recording start command from the system controller 5, the drive controller 6 turns off the tracking servo, focus servo, and laser drive, and restarts the spindle from the low power consumption mode in which the spindle motor is in a free run. Thus, the laser is turned on, the focus is pulled in, and the tracking is pulled in at a predetermined rotational speed, and the mode is changed to the normal mode in which data can be recorded on the disk, and the recording operation is performed.

  Thereafter, when the buffer memory 3-1 falls below a predetermined data accumulation amount by the recording operation, the recording operation is stopped, and the drive controller transitions again to the low power consumption mode.

  FIG. 2 shows a flowchart of the transition to the low power consumption mode, and FIG. 3 shows a flowchart of the transition to the normal mode.

  In the transition to the low power consumption mode, the tracking servo is turned off (step S101), the focus servo is turned off (step S102), the laser is turned off (step S103), the spindle motor servo is turned off, and the spindle motor is free. The run state is set (step S104). Furthermore, by stopping the servo control unit 10 (step S105), a mode in which power consumption is suppressed is set.

  In the transition to the normal mode, the servo control unit 10 that has been stopped needs to be operated again. Therefore, the servo control unit 10 needs to be set before the servo is turned on. First, the return processing of the servo control unit 10 is performed (step S201), then laser characteristic learning is performed (step S202), the target rotation speed is set in the spindle motor servo (step S203), and laser emission is started (step S203). Step S204). Next, it waits for the rotation of the spindle motor to stabilize (step S205). After stabilization, the gain of the focus servo is set (step S206), and the gain of the tracking servo is set (step S207). In this state, the focus is turned on (step S208), the tracking gain is learned (step S209), and the tracking is turned on (step S210), whereby the drive controller 6 returns to the normal mode.

  The time required for the transition from the normal mode to the low power consumption mode is less than 0.1 second, but the transition from the low power consumption mode to the normal mode requires about 1.9 seconds. The time obtained by subtracting the transition time of 1.9 seconds from the standby time that can be kept waiting without recording is the time for entering the low power consumption mode.

  The operation for moving the recording data between the memories will be described in more detail.

  The threshold of the free capacity of the buffer memory 3-1 that instructs the drive controller 6 to start recording needs to be determined in consideration of the time required for mode transition of the drive controller 6. That is, it is necessary to start the recording operation in anticipation of the time required for the transition to the normal mode, and to control so that the allocated buffer does not overflow. In addition, during the transition to the normal mode, since the servo control unit is restored and the laser is turned on, intermittent recording is realized by including the normal mode time from the viewpoint of power consumption and heat generation.

  The rate at which the drive controller 6 reads data to be recorded from the buffer memory 3-1 is set to be higher than the rate of data generated by the video compression unit 106. As a result, the amount of data stored in the buffer memory 3-1 can be reduced in a predetermined time.

  If recording cannot be continued due to vibration or shock during the recording operation of the drive controller 6, the drive controller 6 temporarily stops recording, and resumes recording after it becomes ready for recording again. During this time, reading of data from the buffer memory 3-1 stops, so that the amount of data stored in the buffer memory 3-1 increases.

  When the buffer memory 3-1 is full, the data generated by the video compression unit 106 is accumulated in the shock proof memory 3-2.

  When the drive controller 6 recovers from the influence of vibration and shock, the drive controller 6 reads data from the buffer memory 3-1, and resumes recording. When data is read from the buffer memory 3-1, the data in the shock proof memory 3-2 is sequentially transferred to the buffer memory 3-1. As a result, as long as the shock-proof memory 3-2 does not overflow, recording can be continued without losing data even when vibration or impact occurs.

  When the data storage amount in the buffer memory 3-1 falls below a certain amount due to the recording operation, the drive controller 6 stops the recording operation and shifts to the low power consumption mode.

  The fixing detection means 1 detects whether or not the device is fixed to a tripod or the like. For example, a push button switch is provided in a screw hole for fixing to a tripod, and the device is turned on when the device is screwed into the tripod. You may do it.

  In addition, since the user recognizes that the tripod is used, the fixed shooting mode selection switch may be operated by the user and fixed.

  The memory control unit 2 sets the OR condition in the OR circuit 8 between the output of the fixed detection means 1 and the fixed setting switch 7 as a fixed detection result, thereby allocating the buffer memory 3-1 and the shock proof memory 3-2. Do.

  The data output amount per unit time of the video compression unit 106 is the data transfer rate, and the minimum time when the drive controller 6 is in the low power consumption mode within one cycle of the intermittent recording system is the minimum intermittent time, which is due to vibration / impact. Assuming that the recovery time from the servo failure is the recovery time and the total memory amount of the memory unit 3 is the total memory, the memory control unit 2 determines that the fixed detection result is the buffer memory 3-1 on the non-fixed side versus the shock proof memory 3-2. The division ratio ranges from ((data transfer rate x minimum intermittent recording time) / total memory) to (minimum division ratio), 1- (data transfer rate x recovery time) / total memory) (maximum division ratio). Set the value of.

  FIG. 4 shows the basis for determining the minimum division ratio on the non-fixed side, and FIG. 5 shows the basis for the maximum division ratio. 4 and 5, the horizontal axis represents time, and the vertical axis represents the data amount. The plotted graph represents the accumulation of data at the transfer rate.

  The minimum intermittent time is the minimum value of the time during which the drive controller 6 should enter the low power consumption mode from the product specification during intermittent recording. In a small and portable application that dislikes noise, such as a video camera, heat is easily generated due to the reduction in size and weight, and it is difficult to use a large heat sink, and it is also difficult to use a fan that generates noise. Due to this thermal problem, the operation duty of the drive controller 6 may be limited. The minimum intermittent time is a value for limiting the operation duty of the drive controller 6, and the memory amount when the minimum intermittent time has elapsed becomes the minimum buffer amount as shown in FIG.

  On the other hand, since the recovery time is a time when the drive controller 6 becomes unable to record data, it is necessary to secure a data storage area for the recovery time in the shock proof memory 3-2. As shown in FIG. 5, when the recovery time is secured from the point that the memory unit 3 becomes full, the maximum value of the buffer amount can be determined.

  On the fixed side, since it is fixed, no recovery operation occurs due to servo detachment. Therefore, all of the total memory can be used as a buffer, that is, the maximum division ratio is 1. However, it is assumed that the servo jump does not occur due to vibration shock or the like, but the track jump occurs due to media scratches or track groove variations. In this case, the servo is not completely disengaged, and recovery is possible with a rotation waiting time of about 3 rotations of the disk by track jump and retrace, so the memory amount corresponding to this time is not used for the maximum divide ratio and the shock proof memory May be secured.

  When the data transfer rate is 10.8 Mbps, the minimum intermittent recording time is 7.6 seconds, the previous recovery time is 3.8 seconds, and the total memory is 32 Mbytes, the minimum division ratio on the non-fixed side is 0.31. The maximum division ratio is 0.85, and the buffer amount is from 9.8 Mbytes to 27 Mbytes. Here, it is selected to allocate 27 Mbytes as the non-fixed buffer amount.

  Since the maximum division ratio on the fixed side is 1, the buffer amount is 32 Mbytes at the maximum. However, assuming that recording is performed at a double speed on an 8 cm DVD, the waiting time on the outer periphery is about 34 milliseconds. About 1 Mbyte is allocated as a shock proof buffer of about 100 milliseconds corresponding to waiting for three laps, and 31 Mbyte is allocated as a fixed buffer amount.

  When the fixing of the apparatus is detected, the capacity of the buffer memory 3 is increased, and the recording start instruction cycle by the system controller 5 is increased. As a result, the number of times the drive controller 6 transitions from the low power consumption mode to the normal mode is reduced.

  When the amount of buffer on the non-fixed side and the fixed side is 27 Mbytes and 31 Mbytes and 1.3 Gbytes of data is written, the required number of recording operations is about 49 times on the non-fixed side, but about 42 times on the fixed side. Decrease to times.

  As described above, in the first embodiment, the buffer controller 3-1 and the shock proof memory 3-2 are dynamically allocated by the memory controller 2 in accordance with the output of the fixed detection means, so that the recording operation of the drive controller 6 is performed. And the power consumption can be reduced.

  In the above embodiment, the case of video compression in MPEG2 has been described as an example. However, the present invention can be applied to a case in which the image is compressed and recorded in MPEG4, and is not limited to this method.

  FIG. 6 is a block diagram showing in detail the internal configuration of the drive controller of this embodiment. As shown in FIG. 6, a servo control unit 10 is mounted, and feedback is performed from the focus error signal and tracking error signal obtained from the optical pickup so that the light beam converges on the disk and accurately follows the track. Control is in progress. Specifically, a DSP (digital signal processor) constitutes a digital filter with a multiplier, an adder, and a delay, and PID control such as integration compensation, phase lead compensation, and gain adjustment is performed.

In order to ensure the ability to follow the servo to the disturbance, the gain of the disturbance frequency is given by the proportional term (P) and integral term (I) to improve the tracking accuracy against disc eccentricity, surface shake, vibration, shock, etc. The term (D) compensates for the phase lead in the disturbance frequency band such as vibration and shock, and secures the phase margin to improve the tracking stability. Because it is fixed with
Since disturbances such as vibration and impact are basically not applied, the servo only needs to ensure tracking at low frequencies such as eccentricity and surface runout, reduce phase lead compensation, and reduce high frequency tracking. It will be better. In other words, the focus and tracking loop gain can be lowered. As a result, noise components in the high frequency range can be reduced compared to non-fixed, power consumption can be reduced, and servo sound can be reduced due to noise. Since followability (stability) is required, it is necessary to secure a loop gain and to have a phase margin. Therefore, as shown in the flowchart of FIG. In normal mode with intermittent recording (S301), focus and tracking pull-in are confirmed (S302). After determining normality, it is determined whether it is fixed (S304). If fixing is detected, the loop gain is lowered. As described above, the parameters in the servo controller of the drive controller are switched (S305).

(Embodiment 2) Corresponding to Claim 7 FIG. 8 is a block diagram showing a configuration of an information recording apparatus in a second embodiment of the present invention. In FIG. 8, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

In the second embodiment, mechanical correction detection by the fixed detection unit 1 or the fixed setting switch 7 of the first embodiment is replaced with a correction signal generated by camera shake correction processing by software processing.

As a fixed detection method using an image, there is a method of using a correction signal for optical camera shake correction. The camera shake correction signal mounted on the image sensor in FIG. 8 is generated by a system controller. Naturally, when the camera is fixed on a tripod, camera shake does not occur. Therefore, the correction signal is close to 0, and camera shake is detected and a correction signal is generated when shooting while tracking a moving object by hand carry. A threshold value is provided for the correction signal, and it is detected that the camera shake correction signal has not exceeded the predetermined threshold value for a predetermined time from the start of photographing, and is switched to the fixed side.
Until shooting or at the initial stage of fixed shooting, fixing to a tripod, moving a shooting location, adjusting a shooting position, etc. are assumed. Minutes are appropriate. In addition, since a scene is assumed where shooting is performed by moving from fixed to hand carry, it is preferable to switch from the fixed side to the non-fixed side. In this case, the threshold should be set lower than the threshold for switching to the fixed side, and the detection time should be set as short as 30 seconds to 1 minute (a few cycles of intermittent recording time). Even if it is not, if it is configured to operate the fixed detection from the camera shake correction signal when the power is turned on, it is possible to detect the fixed or non-fixed before the photographing.

Combining all the above-mentioned fixed detection due to camera shake, the effect is even greater,
Fixed trip detection is possible even when shooting without using a tripod, on a desk, or when seated and fixed firmly with your hands and chest, reducing power consumption. The flow is shown in FIG.

  The fixed determination process is called periodically at regular intervals. In the fixed state determination process, the fixed / non-fixed determination timer is first updated (S400), and if the current mode is the fixed mode, the process branches to the non-fixed detection process, and if the current mode is the non-fixed mode, the process branches to the fixed detection process (S401).

In the case of the fixed mode, it is inspected whether the timer value is a threshold value T1, for example, less than 30 seconds (S402), and if it is less than the threshold value T1, it is inspected whether the touch amount is less than the threshold value 1 (S403). When the camera shake amount is less than the threshold value 1, the timer is reset assuming that there is no change from the fixed state (S404). When the camera shake amount is greater than or equal to the threshold value 1, the timer value is increased because the timer is not operated. When the timer value is equal to or greater than the threshold value T1, the mode is not fixed (S405).
In the non-fixed mode, it is checked whether the timer value is a threshold value T2, for example, less than 5 minutes (S406). If the timer value is less than the threshold value T2, it is checked whether the amount of touch is less than the threshold value 2 (S407). When the camera shake amount is less than the threshold value 2, there is a possibility of a fixed state, so the timer is not operated. For this reason, the timer value increases. If the camera shake amount is greater than or equal to the threshold 2, the timer is reset assuming that there is no change from the non-fixed mode (S408). When the timer value is equal to or greater than the threshold value T2, the mode is fixed (S409).

  Incidentally, as a method for correcting camera shake, a method as described in Japanese Patent No. 3575989 has been proposed and realized, and the details thereof are not directly related to the present invention, and thus description thereof will be omitted. There are several methods for correcting camera shake, such as optical and electronic methods, but the present invention is not limited by these methods and methods.

Video cameras are usually equipped with white balance correction (AWB) and automatic exposure (AE) functions. However, outdoor and indoor conditions are detected from the AWB and AE signals, and AND conditions are used with the camera shake correction signal. If fixed detection is performed, it is possible to improve the fixed detection accuracy in a scene such as using a tripod or photographing for a long time, particularly at an important indoor event such as a graduation ceremony, an entrance ceremony, or a wedding ceremony.
Further, by combining with the first embodiment, it is possible to improve the accuracy of fixed detection in a more frequently used scene.

  The information recording apparatus according to the present invention has a function of reducing power consumption when the apparatus is fixed, and is useful as a video camera for recording on an optical disc.

1 is a block diagram of an optical disk recording apparatus according to Embodiment 1 of the present invention. Flowchart of transition to low power consumption mode of optical disc recording apparatus in Embodiment 1 of the present invention Flowchart of transition to normal mode of optical disc recording apparatus in Embodiment 1 of the present invention The figure of the relationship between the minimum intermittent time and buffer division | segmentation ratio in Embodiment 1 of this invention Diagram of the relationship between recovery time and buffer division ratio in Embodiment 1 of the present invention The figure of the servo control part in Embodiment 1 of this invention Flowchart of gain switching determination in Embodiment 1 of the present invention Block diagram of an optical disk recording apparatus in Embodiment 2 of the present invention Flowchart of fixed detection in Embodiment 2 of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fixed detection means 2 Memory control part 3 Memory part 3-1 Buffer memory 3-2 Shock proof memory 5 System controller 6 Drive controller 7 Fixed setting switch 8 OR circuit 10 Servo control part 101 Disk recording medium 102 Optical pick-up 103 Optical pick-up control Means 104 Spindle motor 105 Modulation / demodulation means 106 Video compression section 108 Imaging means 200 Focus servo multiplier 201 Focus servo proportional term 202 Focus servo integral term 203 Focus servo differential term 211 Tracking servo multiplier 212 Tracking servo proportional term 213 Tracking servo integral term 214 Tracking servo differential term

Claims (7)

An information recording apparatus for recording video or / and audio as data on an information recording medium,
Memory means for temporarily storing the data before recording it on the information recording medium, and dividing the memory means into a first memory area used as a shock proof and a second memory area used as a buffer A memory allocating unit to be arranged and a fixed detecting unit for detecting that the information recording device is fixed;
The information recording apparatus according to claim 1, wherein the memory allocation unit is configured to switch a division ratio of the memory unit in accordance with a detection signal of the fixed detection unit. When the detection signal of the fixed detection means is on the fixed side, the memory allocation means is configured to switch the division ratio so as to reduce the ratio of the first memory area to the second memory area. The information recording apparatus according to claim 1. When the memory allocation means detects that the division ratio between the second memory area and the first memory area is not fixed (data transfer rate × minimum intermittent recording time) / total capacity of the memory means 1- (data 2. The information recording apparatus according to claim 1, wherein the maximum division ratio is 1 when it is determined to be equal to or greater than (transfer rate × recovery time) / total capacity of the memory means and when it is detected as fixed. 2. The information recording apparatus according to claim 1, further comprising gain control means for setting a servo gain of the information recording apparatus, wherein the setting of the gain control means is switched to a low gain in accordance with a signal from the fixed detection means. . The information recording apparatus according to claim 1, wherein the fixed detection means is a switch configured to be turned on / off when a tripod is used. The information recording apparatus according to claim 1, wherein the fixing means is a switch that can be set and released according to a user's intention. An information recording apparatus for recording video or / and audio as data on an information recording medium,
Memory means for temporarily storing the data before recording it on the information recording medium, and dividing the memory means into a first memory area used as a shock proof and a second memory area used as a buffer And a camera shake correction unit that optically or electronically corrects camera shake of video data to be recorded. Further, the fixed state detection unit has a camera shake signal of the camera shake correction unit at the start of recording. A state determination unit that detects whether the recorded environment is fixed or hand-carried,
The information recording apparatus according to claim 1, wherein the memory allocation unit is configured to switch a division ratio of the memory unit according to a determination signal from the fixed state detection unit.

Images