JP6857066B2 - Recording / playback device, control method of recording / playback device, and program - Google Patents

Description

The present invention relates to a recording / playback device, a control method for the recording / playback device, and a program.

There is a device that writes image data, audio data, or the like on a recording medium such as a memory card, or reads and reproduces the data recorded on the recording medium. Data is written and read between the device (host device) to which the recording medium is connected and the recording medium in accordance with the clock signal generated by the host device. After the host device transmits one clock pulse of the clock signal, data to be written or read is transmitted / received, or a response to a command is received. Therefore, the clock pulse and the data or response are not transmitted and received at the timing of perfect synchronization. For example, when the host device reads data from a recording medium such as an SD memory card, only a standardized fixed value is used from the time when the clock pulse is given to the recording medium by the host device until the data is transmitted. There will be a delay. Therefore, the host device acquires the data transmitted from the recording medium by latching the data transmitted from the recording medium at a timing delayed by a fixed value from the transmission of the clock pulse.

On the other hand, in recent years, with the improvement of the data rate for reading and writing to the recording medium, it is necessary to speed up the transmission of the clock pulse, and it is difficult to specify the delay amount from the clock pulse for data acquisition with a fixed value. It has become. On the other hand, in UHS-I (Ultra High Speed), which is a high-speed standard for SD memory cards, when reading data using a high-speed clock, the data should be read after adjusting the data latch timing for each card. Is stipulated. Such a latch timing adjustment process is called a tuning process (see Patent Document 1).

In addition, devices having a function of simultaneously recording moving images shot on a plurality of recording media have also appeared.

Japanese Unexamined Patent Publication No. 2012-54715

Since data cannot be written to the recording medium during the tuning process, the free space of the buffer for the data for writing decreases, and the buffer may overflow. In particular, when moving images are being recorded on a plurality of recording media at the same time, if tuning processing is performed on the plurality of recording media at the same time, a buffer overflow occurs on the plurality of recording media and recording is stopped at the same time. There is a risk that it will end up.

The present invention has been made in view of such a situation, and provides a technique for suppressing the simultaneous occurrence of recording stop due to a buffer overflow while suppressing the occurrence of write errors and retries due to insufficient tuning.

The recording / reproducing device of the present invention for solving the above problems is
An output means that outputs a clock signal to each of a plurality of recording media,
A communication means that transmits a command to each of the plurality of recording media and receives data transmitted from each of the plurality of recording media according to a timing signal obtained by delaying the clock signal.
The communication means is provided with a control means for controlling the execution of the adjustment process for adjusting the delay amount of the timing signal for each of the plurality of recording media.
The control means suppresses execution of the adjustment process for the other recording medium among the plurality of recording media while the adjustment process for any one of the plurality of recording media is being executed. To control.

According to the present invention, it is possible to suppress the simultaneous occurrence of recording stop due to buffer overflow while suppressing the occurrence of write errors and retries due to insufficient tuning.

The block diagram which shows the structural example of the recording / reproduction apparatus corresponding to the embodiment of an invention. A block diagram showing a configuration example of the memory card controller 113 corresponding to the embodiment of the present invention, and a diagram for explaining the latch timing of the memory card. The flowchart which shows an example of the operation of the recording / playback apparatus corresponding to Embodiment 1 of the invention. A sequence chart showing an example of the operation of the recording / reproducing device corresponding to the first embodiment of the present invention. The flowchart which shows an example of the operation of the recording / playback apparatus corresponding to Embodiment 2 of the invention. A sequence chart showing an example of the operation of the recording / reproducing device corresponding to the second embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The technical scope of the present invention is determined by the scope of claims, and is not limited by the following individual embodiments. Also, not all combinations of features described in the embodiments are essential to the present invention.

<First Embodiment>
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. In the embodiment described below, as an example of the recording / playback device, an example in which the present invention is applied to a digital camera capable of writing / reading data to a plurality of connected memory cards will be described. However, the present invention can be applied to any device (host device) capable of writing / reading data to a plurality of recording media at the same time, and is not limited to a digital camera, for example, a personal computer, a mobile phone, a smartphone, and the like. It can also be implemented as an arbitrary host device such as a PDA, a digital video camera, a tablet terminal, a portable media player, an information processing device, an imaging device, a data generation device, or the like.

FIG. 1 is a block diagram showing an example of the configuration of the digital camera 100 of the present embodiment. In FIG. 1, the photographing lens 101 captures a subject image, and after the amount of light is limited to a predetermined amount by the aperture 102, the subject image is formed on the image sensor 103. The imaged subject image is digitized by the A / D converter 104. The digitized image data is held in the frame memory 106 after gamma correction, white balance correction, noise reduction processing, and the like are performed by the image processing unit 105. The image data held in the frame memory 106 is output to the data bus 107 as uncompressed image data.

In the present embodiment, the configuration from the photographing lens 101 to the frame memory 106 will be referred to as an imaging unit 10. In the following embodiment, a case where the image data output from the imaging unit 10 is written to the memory card A115 or the memory card B121 which is a recording medium will be described. However, the object to which the present invention is applicable is not limited to image data, but is limited to audio data, multimedia data including moving image data and audio data, or any other object that can be written to a memory card. It may be data. These types of data can be collectively referred to as information data. The recording / reproducing device according to the embodiment of the present invention may further include a microphone, an A / D converter, a voice generation unit including a voice processing unit, and the like in addition to the imaging unit 10 in order to generate information data. ..

The imaging unit 10 outputs uncompressed image data and image display data to the data bus 107, and the data is stored in the memory 116. The memory 116 may be configured as, for example, a DRAM. The JPEG codec 108 compresses and encodes the uncompressed image data held in the memory 116 as a still image to generate JPEG still image data. The MPEG codec 109 compresses and encodes uncompressed image data as a moving image to generate MPEG moving image data.

The display 111 is a display unit that displays images and various information, and is composed of, for example, a liquid crystal panel. The display driver 112 converts the image display data stored (held) in the memory 116 into a display signal for the display 111 and supplies the data to the display 111. In this way, the image data for display written in the memory 116 is displayed by the display 111 via the display driver 112. The display 111 functions as an electronic viewfinder and can also display a through image. When the display 111 functions as an electronic viewfinder, the display driver 112 reduces the resolution of the digital signal once A / D converted by the A / D converter 104 and stored in the memory 116 according to the number of dots of the display 111. .. After that, the display driver 112 converts the digital signal into a liquid crystal display signal and sequentially transfers the digital signal to the display 111.

The memory 116 is also used as an area (buffer) for temporarily storing data recorded on the memory card, such as JPEG still image data generated by the JPEG codec 108 or MPEG moving image data generated by the MPEG codec 109. To. In the present embodiment, a buffer is secured for each of the data recording destination memory cards when the simultaneous recording mode described later is executed. The data stored in the buffer of the memory 116 is read by the memory card controller 113 and written to the memory card 115 (recording medium). The writing and reading of data to the buffer is controlled by the control unit 118. The memory 116 also provides a working memory space for the pixel number conversion unit 110 that generates a thumbnail image to be used for index display during reproduction from the captured image. The pixel number conversion unit 110 converts the number of pixels of the frame image of the JPEG still image data and the MPEG moving image data held in the memory 116 to generate a thumbnail image. Further, as described above, the memory 116 also provides a space as a video memory for displaying on the display 111. Further, the memory 116 stores a tuning flag indicating whether or not tuning processing is being performed for each connected recording medium.

The memory card A115 and the memory card B121 (hereinafter, collectively referred to as a memory card) can be attached to and detached from the digital camera 100 via the card slot / detection SWA114 and the card slot / detection SWB120. These memory cards can be composed of, for example, NAND flash memory (registered trademark). The control unit 118 can manage the data recorded in the memory card as a file according to a file system such as a FAT (File AllocatiON Table) file system.

The memory card controller 113 communicates with the memory card A115 or the memory card B121 to control them, and records the data from the memory 116 in the memory card. Further, the memory card controller 113 reads data from the memory card and transfers the data to the memory 116.

The card slot / detection SWA114 is a slot for mounting the memory card A115, and includes a detection SW (switch) for detecting the presence / absence of mounting in the slot. The card slot / detection SWB120 is a slot for mounting the memory card B121, and includes a detection SW (switch) for detecting the presence / absence of mounting in the slot.

The operation unit 117 is composed of various operation members that receive various operations from the user, and includes a shutter button for performing a still image shooting operation, a trigger button for instructing movie shooting start and shooting stop, a camera shooting mode, and a playback mode. It can include a mode switch to switch between.

The ROM 119 is a non-volatile memory that can be electrically erased and recorded, and stores constants, programs, and the like for the operation of the control unit 118. The program referred to here is a program for executing various sequences described later in the present embodiment, and realizes each operation of the present embodiment described later.

The control unit 118 has one or more processors (for example, a CPU) and operates according to an operation program stored in the ROM 119 to control each unit of the digital camera. The control unit 118 controls the display by controlling the display driver 112 and the like. Further, in the present embodiment, the control unit 118 uses the tuning pattern signal of the same pattern as that stored in the memory card A115 or the memory card B121 to determine the success or failure of the test pattern described later and to determine the optimum latch timing. I do.

Next, the configuration and operation of the memory card controller 113 will be described with reference to FIG. 2 (A). FIG. 2A is a block diagram showing an example of the configuration of the memory card controller 113 corresponding to the present embodiment. The memory card controller 113 transmits and receives signals and data via the CLK line, the CMD line, and the DAT line when writing and reading data to and from the memory card. The processing for the memory card will be described below. This process can be similarly performed on the memory card A115 and the memory card B121.

The clock source 201 outputs a clock signal (CLK signal) composed of clock pulses used for read / write timing control to a memory card via a CLK line. The clock source 201 gives the memory card the timing of data writing and reading, and also gives the host controller 202, which will be described later, the timing of data transmission and reception. The host controller 202 outputs a command signal instructing a command related to reading and writing, and receives a response signal from the memory card for the command via the CMD line. Further, the host controller 202 controls transmission / reception of data to be written to the memory card or data read from the memory card via the DAT line. In the present embodiment, data is written from the host controller 202 in units of data in a writing unit of a predetermined size. Here, the data size corresponding to one writing unit is the write size β described later. The host controller 202 transmits the moving image data, the still image data, or other data read from the buffer of the memory 116 to the memory card via the DAT line in synchronization with the clock signal from the clock source 201.

In reading and writing data, the timing of clock pulse and data transmission / reception is different as described above. Therefore, for example, the delay element 203 delays the phase of the clock signal according to the control of the control unit 118 when reading data from the memory card, and generates a timing signal for receiving the data output from the memory card. Then, the flip-flop 204 latches the data output from the memory card according to the timing signal output from the delay element 203. That is, the timing signal defines the timing at which the data is latched.

Further, the flip-flop 206 latches the data for writing from the host controller 202 according to the timing of the clock signal from the clock source 201, and transmits the data to the memory card via the DAT line. The signal branching unit 205 switches between the CMD line and the DAT line according to the input / output of commands and the transmission / reception of data. The response and data from the memory card output from the flip-flop 204 are sent to the host controller 202.

Next, the operation of the tuning process (adjustment process) corresponding to the present embodiment will be described. The memory card controller 113 issues a test data transmission command to the memory card. In response to this, the memory card transmits a 64-byte data string (test data) of a predetermined pattern in synchronization with the clock signal sent from the clock source 201. The memory card controller 113 receives the test data according to the timing signal obtained by delaying the clock signal generated by the clock source 201 by the delay element. Here, the phase of the timing signal can be changed by changing the value of the number of delay stages set in the delay element 203. The control unit 118 determines the success or failure of receiving the test data while changing the phase relationship between the clock signal and the timing signal, that is, changing the latch timing by the flip-flop 204.

Specifically, the control unit 118 sends a test data transmission command to the memory card in a state where the amount of the delay element 203 is set to the first delay amount. Then, the test data transmitted by the memory card is received by the flip-flop 204 according to the timing signal having the first delay amount. The control unit 118 compares the received test data with the test data held in advance, and determines whether or not the received test data can be correctly received. When the process of receiving the test data by the timing signal of the first delay amount is completed, the control unit 118 next sets the delay amount of the delay element 203 to the second delay amount, and issues the test data transmission command again. Send to the memory card A115. Then, it is determined whether or not the received test data correctly received according to the timing signal of the second delay amount.

In this way, the control unit 118 repeats the process of determining whether or not the test data can be correctly received at each delay amount while changing the delay amount by the delay element 203. The amount of delay to be changed at one time is about one tenth of one cycle of the clock signal. Then, when the reception of the test data by the timing signals of all the delay amounts is completed, the control unit 118 selects the delay amount that succeeds in receiving the test data most stably, and uses this as the delay amount of the timing signal as the delay element. Set to 203.

FIG. 2B is a diagram for explaining the latch timing of the memory card. It is possible to secure a plurality of latch timings by setting a plurality of delay amounts for one cycle of the clock signal. Here, the latch timing of 16 steps is secured.

The series of processes as described above is called a latch timing tuning process (that is, an adjustment process for adjusting the amount of delay of the timing signal). As described above, it is not possible to write and read the image data to the memory card during the tuning process.

Next, the control operation of the tuning process by the recording / reproducing device during data recording will be described with reference to FIG. FIG. 3 is a flowchart showing an example of processing executed by the recording / playback device corresponding to the present embodiment. In FIG. 3, a moving image shooting mode for recording MPEG moving image data encoded by an MPEG coding method accompanied by inter-frame predictive coding will be described as an example. However, this embodiment is not limited to the inter-frame predictive coding or the MPEG coding method, and can be applied to the case of recording any moving image data. Further, the present embodiment is not limited to moving image data, and is applicable to the case of recording continuously generated data. For example, the generated data may be voice data or other data.

Even during recording, it is necessary to receive a response from the memory card to the write command output to the memory card. Therefore, it is desirable to receive data at an appropriate latch timing even during recording. On the other hand, images generated by movie shooting generally have a large data size, so if tuning prevents data from being written, the free space in the internal buffer will decrease, which may lead to recording stoppage due to buffer overflow. There is. Therefore, it is particularly effective to reduce the frequency of tuning during recording accompanying the moving image shooting operation.

The digital camera 100 as the recording / reproducing device of the present embodiment has a "normal recording mode" in which a moving image is recorded on one of the two memory cards A115 and B121 selected by the user. The digital camera 100 also has a "simultaneous recording mode" in which the same moving image data is simultaneously recorded on the two memory cards A115 and B121. The simultaneous recording mode is a recording mode that ensures the safety of recording by recording the same data twice on two memory cards. The user can set the simultaneous recording mode by operating the operation unit 117 in the recording standby state.

When the normal recording mode is set, the control unit 118 of the digital camera 100 responds to the instruction from the user to start recording, and receives moving image data for one of the memory cards A115 and B121 selected by the user. Start recording. Further, the control unit 118 executes the tuning process at regular intervals from the start of recording in the normal recording mode. Then, when the user gives an instruction to stop recording, the recording of the moving image is stopped.

Next, the processing in the simultaneous recording mode will be described. After the user sets the simultaneous recording mode, when the operation unit 117 is operated to instruct the start of recording, the processing of the flowchart of FIG. 3 starts. Here, a case will be described in which the tuning timing of the memory card B121 is reached during the tuning of the memory card A115 when the moving image data is simultaneously recorded on the memory card A115 and the memory card B121. First, the process related to the memory card A115 will be described.

In S301, the control unit 118 controls the MPEG codec 109 to encode the moving image data, and stores the encoded moving image data in the buffer of the memory 116 allocated for the moving image data.

In the present embodiment, the data writing speed to the memory card A115 is higher than the data rate of the encoded moving image data. Therefore, when recording the moving image data, the encoded moving image data is temporarily stored in the buffer of the memory 116. Then, when the amount of unrecorded moving image data stored in the buffer reaches a predetermined amount of data, the moving image data is read from the buffer and recorded in the memory card A115. Since the recording speed of the memory card A115 is higher than the data rate of the moving image data, the amount of the moving image data stored in the buffer decreases while the moving image data is being written to the memory card A115. However, during that time, the moving image data is continuously accumulated in the buffer. Then, when the writing of the moving image data of a predetermined size to the memory card A115 is completed, the writing is stopped. As described above, in the present embodiment, the moving image data is intermittently recorded on the memory card A115 from the start of recording of the moving image to the stopping of recording.

Next, in S302, the control unit 118 determines whether or not the total size α (megabytes (MB)) of the moving image data stored in the buffer of the memory 116 has reached the write size β (MB). Here, the write size β is a size written to the memory card A115 in one writing process in the intermittent recording of moving image data, as described above. When the total size α of the moving image data stored in the buffer reaches the write size β, the process proceeds to S303.

In S303, the control unit 118 controls the memory card controller 113 to issue a write command to the memory card A115, and writes the moving image data for the write size β stored in the buffer of the memory 116 to the memory card A115. When the writing of the data is completed, in the subsequent S304, the control unit 118 determines whether or not it is the timing of the tuning process. In the present embodiment, the tuning process is performed at regular intervals from the start of recording the moving image. In addition to this, a configuration in which tuning processing is performed every time the number of times the video data is written reaches a predetermined number of times, a configuration in which tuning processing is performed every time the total recorded size of video data reaches a predetermined size, etc. , The tuning process may be performed periodically.

When it is determined in the determination in S304 that it is the tuning processing timing, the control unit 118 refers to the tuning flag of the memory 116 in S305, and the tuning process is performed on the card other than the card to be tuned this time. Determine if it is running. The determination can be made by referring to the value of the tuning flag held in the memory 116 for each memory card. If the tuning flag is ON, it is determined that tuning is in progress, and if the tuning flag is OFF, it is determined that tuning is not in progress. If there are a plurality of cards other than the card to be tuned this time, the tuning flag for each memory card is referred to for determination. Here, since the tuning target this time is the memory card A115, it is determined whether or not the memory card B121 is being tuned as another memory card. If it is determined in S305 that a card other than the card to be tuned this time is being tuned, the process proceeds to S309, and the control unit 118 does not perform the tuning process.

When it is determined in S305 that another memory card is not in the tuning process, the control unit 118 sets the tuning flag of the memory card to be tuned this time stored in the memory 116 in S306 to ON. Subsequently, the control unit 118 controls the memory card controller 113 in S307 to perform tuning processing of the memory card A115. When the tuning process is completed, the control unit 118 releases the tuning flag of the card that has completed the tuning process stored in the memory 116 in S308 and sets it to OFF.

Further, when it is determined in S304 that it is not the timing of the tuning process, in S305 it is determined that another card is executing the tuning process, or when the tuning process is completed in S308, the control unit 118 , S309 determines whether or not to stop the moving image recording. For example, when the capacity of the memory card A 115 becomes full, or when a recording stop instruction is given via the operation unit 117, the control unit 118 determines that the moving image recording is stopped. When it is determined in S309 that the moving image recording is not stopped, the process returns to S301, and the control unit 118 repeats the processing after S301 to continue the moving image recording. On the other hand, when it is determined to stop the moving image recording, the control unit 118 writes the moving image data and management information stored in the buffer of the memory 116 in order to close the moving image file being recorded in S310 to the memory card A115, and then writes the moving image data and the management information to the memory card A115. Stop video recording.

Next, the processing related to the memory card B121 will be described. The description of the parts equivalent to those described above for the memory card A115 will be omitted as appropriate. Since S301, S302, S303 and S304 are the same as above, the description thereof will be omitted.

In S305, the control unit 118 refers to the value of the tuning flag associated with the memory card B121 of the memory 116 to determine whether or not a memory card other than the memory card B121 to be tuned this time is being tuned. .. If there are a plurality of cards other than the card to be tuned this time, the tuning flag of each memory card is referred to for determination. Here, since the tuning target this time is the memory card B121, it is determined whether or not the memory card A115 is being tuned as another memory card. When a card other than the tuning target of this time is being tuned, the control unit 118 controls the execution timing of the tuning process so as to suppress the execution of the tuning process of the target card.

When it is determined in S305 that another memory card is not in the tuning process, the control unit 118 sets the tuning flag of the memory card to be tuned this time stored in the memory 116 in S306 to ON. In the following S307, the control unit 118 controls the memory card controller 113 to perform tuning processing of the memory card B121. When the tuning process is completed, the control unit 118 in S308 sets the tuning flag of the card that has completed the tuning process this time, which is stored in the memory 116, to OFF.

In this way, in the simultaneous recording mode, when it is the timing of the tuning process for each memory card, it is determined whether or not a card other than the card targeted for the tuning process this time is executing the tuning process. Then, when the tuning process for another card is being executed, the tuning process of the card to be the target of the tuning process this time is not performed. In this case, for example, the target card is maintained in a state of tuning processing timing. Then, it is possible to determine again in S304 whether to execute the tuning process on the memory card. As a result, when the tuning process is executed, the state of the timing of the tuning process is released, and when a certain period of time elapses again, the timing of the tuning process is reached. In the process of FIG. 3, even if it is determined in S302 that the light unit has not been reached, the process shifts to S304 to determine whether or not the tuning timing is reached. However, the process of S304 is the process of S303. The configuration may be performed when the data write process is completed. By doing so, it is possible to determine whether or not to start the tuning process when the buffer is free.

FIG. 4 shows a series of operations in the flowchart of FIG. 3 in a time series using the transition of the buffer accumulation state at the time of moving image recording in the simultaneous recording mode of the memory card A115 and the memory card B121, and the time of the write process and the tuning process. It is a figure shown by. The vertical axis is the amount of data stored in each buffer, and the horizontal axis is the time t. In the present embodiment, the buffer allocated to the memory card A115 in the memory 116 is the buffer A, and the buffer allocated to the memory card B121 is the buffer B.

Reference numeral 401 indicates a time for writing the moving image data stored in the buffer A to the memory card A115. Reference numeral 402 indicates the time for tuning the memory card A115. Reference numeral 421 indicates a time for writing the moving image data stored in the buffer B to the memory card B121. Reference numeral 422 indicates the time for tuning the memory card B121.

Regarding the tuning process of the memory card A115, the control unit 118 determines that it is the timing of the tuning process of the memory card A115 when the period indicated by reference numeral 412 arrives. Further, since the memory card B121 is not being tuned at this point, it is determined that the memory card A115 will be tuned. The control unit 118 sets and tunes the tuning flag at the tuning timing of reference numeral 412.

Further, regarding the tuning process of the memory card B121, the control unit 118 determines that the tuning timing of the memory card B121 is reached when the period indicated by reference numeral 431 arrives. However, since the memory card A115 is being tuned at this timing, it is determined that the memory card B121 is not tuned. When the period indicated by reference numeral 432 arrives thereafter, the control unit 118 determines that it is the timing of the tuning process of the memory card B121. At this timing, since the memory card A115 is not being tuned, it is determined that the memory card B121 is to be tuned. As described above, in the present embodiment, the control unit 118 operates so as to exclude the execution of tuning for the plurality of recording media to be recorded in the simultaneous recording mode. The control unit 118 executes the processes corresponding to S306 to S308 at the tuning timing of the reference numeral 432, sets the tuning flag, and executes the tuning process.

According to the present embodiment described above, the digital camera 100, which is a recording / playback device, can exclude duplicate tuning executions for a plurality of recording media to be recorded during simultaneous recording. As a result, while suppressing the occurrence of write errors and retries due to insufficient tuning, it is possible to suppress the simultaneous occurrence of recording stop due to buffer overflow caused by duplicate tuning processing.

<Second embodiment>
In the first embodiment described above, the execution of tuning for a plurality of memory cards to be recorded is excluded by referring to the tuning flag indicating whether or not tuning is being performed for each recording medium during simultaneous recording. On the other hand, in the second embodiment, the control that excludes the execution of tuning for a plurality of memory cards to be recorded will be described with reference to the buffer margins of the other memory cards. In particular, in the present embodiment, even if a memory card other than the memory card to be tuned is not being tuned, the tuning process is suppressed according to the state of the buffer for the other memory card.

The basic configurations of the digital camera 100 and the memory card controller 113 as the recording / reproducing device in the present embodiment are the same as those shown in the first embodiment (FIGS. 1 and 2). Hereinafter, the differences from the first embodiment will be mainly described.

First, the processing of the simultaneous recording mode in the present embodiment will be described with reference to FIG. Here, a case will be described in which the tuning timing of the memory card B121 is reached during the tuning of the memory card A115 when the moving image data is simultaneously recorded on the memory card A115 and the memory card B121.

First, the process related to the memory card A115 will be described. When the user operates the operation unit 117 to instruct the start of recording, the moving image recording process of the flowchart of FIG. 5 is started. Since the processes from S301 to S305 are the same as those in the first embodiment, the description thereof will be omitted. If it is not determined in S305 that another memory card is in the tuning process, the control unit 118 refers to the amount of buffer used for the other memory card, here the memory card B121. In the following S501, the control unit 118 compares the usage amount of the buffer for another memory card with the threshold value, and determines the state of the buffer. If the buffer usage for other memory cards has not reached the threshold, it can be determined that the buffer has room. Further, if the amount of buffer used for other memory cards exceeds the threshold value, it is not determined that there is a margin. In the present embodiment, the threshold value can be, for example, the write size β written to the memory card in the writing process.

When it is determined in S501 that there is a margin in the amount of buffer used for another memory card, the control unit 118 sets ON to the tuning flag of the memory card to be tuned this time, which is stored in the memory 116 in S306. Set. If it is not determined in S501 that there is a margin in the amount of buffer used for another memory card, the tuning process of the card to be the target of the tuning process this time is not performed. In this case, the process shifts to S309. Since the subsequent processes in S307 to S310 are the same as those in the first embodiment, the description thereof will be omitted. In the process related to the memory card B121, the memory card A115 may be read as the memory card B121, and thus the description thereof will be omitted.

FIG. 6 shows a series of operations in the flowchart of FIG. 5 when the transition of the accumulation state of each buffer at the time of moving image recording in the simultaneous recording mode of the memory card A115 and the memory card B121 and the time of the write process and the tuning process are used. It is a figure which shows by a series. The vertical axis is the amount of data stored in the buffer, and the horizontal axis is the time t. Also in this embodiment, the buffer assigned to the memory card A115 in the memory 116 is referred to as the buffer A, and the buffer assigned to the memory card B121 is referred to as the buffer B.

Reference numeral 601 indicates the time for writing the moving image data stored in the buffer A to the memory card A115. Reference numeral 602 indicates the time for tuning the memory card A115. Reference numeral 621 indicates a time for writing the moving image data stored in the buffer B to the memory card B121. Reference numeral 622 indicates the time for tuning the memory card B121.

Regarding the tuning process of the memory card A115, the control unit 118 determines that it is the timing of the tuning process of the memory card A115 when the period indicated by reference numeral 611 arrives. Further, since the memory card B121 is not being tuned at this point, it is further determined whether or not there is a margin in the buffer B of the memory card B121. Here, since the usage amount of the buffer B of the memory card B121 does not exceed the threshold value write size βMB, the control unit 118 controls and tunes the tuning flag at the tuning timing of reference numeral 612. ..

Further, regarding the tuning process of the memory card B121, the control unit 118 determines that the tuning timing of the memory card B121 is reached when the period indicated by reference numeral 631 is reached. Further, since the memory card A115 is being tuned at this point, it is determined that the memory card B121 is not tuned. When the period indicated by reference numeral 632 and reference numeral 633 arrives thereafter, the control unit 118 determines that it is the tuning timing of the memory card B121. Since the memory card A115 is not being tuned at this timing, it is determined whether or not the buffer A of the memory card A115 has a margin. However, the amount of buffer A used exceeds the threshold value of write size βMB, and buffer A has no margin. Therefore, the control unit 118 determines that the memory card B121 is not tuned.

When the period indicated by reference numeral 634 arrives thereafter, the control unit 118 determines that the tuning timing has been reached. Since the memory card A115 is not being tuned even at this timing, it is determined whether or not the buffer A has a margin. Here, since the amount of buffer A used does not exceed the threshold value of write size βMB, it can be determined that buffer A has a margin. Therefore, the control unit 118 determines that the memory card B121 is to be tuned. The control unit 118 controls the tuning flag and tunes the memory card B121 at the tuning timing of reference numeral 632.

As described above, during the simultaneous recording of the memory card A115 and the memory card B121, if the memory card A115 is being tuned or if there is no margin in the buffer A, the memory card B121 is not tuned. An example was explained.

According to the present embodiment, the digital camera 100, which is a recording / playback device, can exclude the execution of tuning for a plurality of recording media to be recorded during simultaneous recording. Further, in consideration of the increase in the buffer usage caused by the execution of the tuning process for one recording medium, the start timing of the tuning process for the other recording medium can be adjusted to prevent the buffer from overflowing. As a result, it is possible to suppress the occurrence of write errors and retries due to insufficient tuning during double processing, and to suppress the simultaneous occurrence of recording stop due to buffer overflow.

(Other Examples)
The present invention supplies a program that realizes one or more functions of the above-described embodiment to a system or device via a network or storage medium, and one or more processors in the computer of the system or device reads and executes the program. It is also possible to realize the processing. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

10 Shooting unit, 113 memory card controller, 115 memory card A, 116 memory, 118 control unit, 121 memory card B 202 host controller

Claims (10)

An output means that outputs a clock signal to each of a plurality of recording media,
A timing signal obtained by transmitting a write command and the data to be written to the recording medium in response to the clock signal in order to write data to each of the plurality of recording media, and delaying the clock signal. A communication means for receiving data transmitted from each of the plurality of recording media according to the above.
The communication means is provided with a control means for controlling the execution of the adjustment process for adjusting the delay amount of the timing signal for each of the plurality of recording media.
In a predetermined recording mode for simultaneously recording data on the plurality of recording media, the control means is performing adjustment processing on any one of the plurality of recording media. Is a recording / playback device, characterized in that control is performed so as to suppress execution of adjustment processing for other recording media among the plurality of recording media. Further provided with a memory for holding the data recorded on the recording medium,
After the adjustment processing for any one of the recording media is completed, the control means adjusts for the other recording medium according to the size of the data held by the memory for writing to the one recording medium. The recording / playback apparatus according to claim 1, wherein the timing for executing the process is determined. The recording / reproducing device according to claim 2, wherein the control means suppresses execution of adjustment processing on the other recording medium until the size of the data held in the memory becomes smaller than the threshold value. The recording / playback device according to claim 3, wherein the communication means transmits the data to be written to the recording medium in a writing unit of a predetermined size, and the threshold value corresponds to the predetermined size. The control means
When the adjustment process is executed for any one of the recording media, a flag indicating that the adjustment process is being executed in association with the recording medium is set, and when the adjustment process is completed, the flag is released.
The recording / playback apparatus according to any one of claims 1 to 4, wherein it is determined whether or not to suppress the execution of the adjustment process on the other recording medium based on whether or not the flag is set. .. The control means is characterized in that it determines whether or not to execute the adjustment process for each of the plurality of recording media at regular intervals after starting recording of the data on each recording medium. The recording / playback device according to any one of claims 1 to 5. The communication means transmits the data to be written to the recording medium in writing units of a predetermined size.
The recording / reproducing device according to claim 6, wherein the control means makes the determination in response to the communication means transmitting data for one writing unit. Equipped with imaging means
The recording / playback apparatus according to any one of claims 1 to 7, wherein the written data is moving image data acquired by the imaging means. An output means that outputs a clock signal to each of a plurality of recording media,
A communication means that transmits a command to each of the plurality of recording media and receives data transmitted from each of the plurality of recording media according to a timing signal obtained by delaying the clock signal.
A control method for a recording / playback device including a control means for controlling the communication means to control execution of an adjustment process for adjusting a delay amount of the timing signal for each of the plurality of recording media.
While the control means is executing the adjustment process for any one of the plurality of recording media, the control means suppresses the execution of the adjustment process for the other recording medium among the plurality of recording media. A method for controlling a recording / playback device, which comprises a process. A program for causing a computer to function as the control means of the recording / reproducing device according to any one of claims 1 to 8.

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