JP3599369B2 - Recording device - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a recording device having a function of recording a moving image and a function of recording a still image .
[0002]
[Prior art]
2. Description of the Related Art As a conventional video recording or reproducing apparatus, there is a so-called VTR (Video Tape Recorder) using a magnetic tape having a tape width of 1/2 inch or 8 mm. In such a video recording / reproducing apparatus, a digital VTR for recording on a magnetic tape after conversion into a digital signal, a disk video for recording on a disk, and a solid-state memory video for recording on a solid-state memory have been proposed. In some of these video systems, compression processing is performed on an input signal to reduce the amount of information, and some video systems can record not only moving images but also high-resolution still images. When a still image is recorded, it is recorded as image data with a lower compression ratio than that of a moving image in order to achieve high detail.
[0003]
In such an apparatus, the remaining amount of the tape as the recording medium is measured by measuring the time from the start of recording, and subtracting it from the preset total recording time of the tape, or the two tape transfer times. By measuring the difference in reel rotation speed, the approximate value of the remaining recordable time is displayed.
[0004]
[Problems to be solved by the invention]
However, in the above conventional example, the remaining amount display of the recording medium is based on the premise that a moving image is recorded, and only the remaining time is displayed. Therefore, the same recording medium can be used for recording a still image, or a moving image and a still image can be used. In the case of using a combination of these, it was not possible to know how many remaining recordable capacities remained as still images.
[0005]
[Means for Solving the Problems]
The recording device according to the present invention is a recording device that records a moving image or a still image on the same recording medium, and displays both the remaining recordable time of the moving image and the remaining recordable number of still images on the same screen. And a control means for performing processing for performing the processing.
Another recording device according to the present invention is a recording device having a built-in recording medium, and has a first function of recording a moving image on the recording medium or a second function of recording a still image on the recording medium. Selecting means for selecting, and processing for displaying a remaining recordable time of a moving image when the first function is selected, and recording of a remaining image of a still image when the second function is selected. Control means for performing a process for displaying the possible number of sheets.
[0006]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0007]
<< Example 1 >>
FIG. 1 shows a configuration block diagram of an embodiment of the present invention. First, at the time of recording, in FIG. 1, stereo audio signals of L and R are input from audio signal input terminals 1 and 2, respectively, and are converted into digital audio signals by A / D converters 3 and 4. The digital audio signal is subjected to various types of processing such as noise reduction and dynamic range restriction in audio signal processing circuits 5 and 6, and data compression processing for the audio signal is performed in an audio data compression circuit 7. For example, adaptive transform coding (ATRAC, ASPEC) or band division coding (MUSICAM, SB / ADPCM) proposed in MPEG may be used, or a vector in two-channel mixing using L / R correlation may be used. Encoding or the like may be used.
[0008]
Next, a video signal such as a video signal input from the video signal input terminal 8 is converted into a digital video signal by an A / D converter 9 capable of processing at a higher speed than the A / D converters 3 and 4. . After the digital video signal is preprocessed by the video signal processing circuit 10, the data amount is compressed by the video data compression circuit 11 to about several tens to several hundredths. For example, taking a moving image as an example, an inter-frame correlation process using temporal image correlation, a motion compensation for reducing image quality degradation in the above-described method, and a forward prediction frame that performs this from the front in the time axis (P picture) and compression by bidirectional prediction frames (B picture) performed before and after (past and future) can be realized by appropriately combining them. Specifically, MPEG-1 as an algorithm proposed in MPEG can secure standard image quality of about 1/2 inch VTR, and MPEG-2 can secure image quality of NTSC or higher.
[0009]
Next, data from an ID signal generation circuit 12, which will be described later, and audio data and video data are synthesized by a data synthesis circuit 13 and stored in a main memory 14. The main memory 14 is controlled by a memory controller 15 such as a memory address and writing / reading. The main controller 15 is controlled by the system controller 16 as a whole, such as switching operations. The system controller 16 receives an instruction of a recording / reproduction / search and operation mode (moving image recording mode, still image recording mode, etc.) from the operation keys 17 and controls the memory controller 15 in response to the instruction. The display unit 18 displays information such as a time code indicating the remaining amount, operation status, recording / reproduction time, and the like, and also notifies the address information generation circuit 19 of the time code. There are mainly two types of time codes. The first is the elapsed time from the beginning of the recording medium or the video program, the accumulated time of camera shooting, and the second is the date and time of recording or camera shooting, the time of hour, minute, second frame, and the like. For generating the latter time code, a calendar and a clock generation circuit 20 are provided.
[0010]
The remaining time of the memory is, for example, M (M−S × N) ÷ D from the total memory capacity M, the recording rate D, and the elapsed time T.
Can be calculated by In the case of a still image, assuming that the data amount of one image is S and the number of photographed images is N, the remaining number of photographable images is
(MD × TS × N)
become.
[0011]
When moving image recording is selected by the operation key 17, the system controller 16 changes the remaining amount display to a time display. When the still image recording is selected, the remaining amount display is switched to the number display. In FIG. 2, reference numeral 1001 denotes an example of the number display, and reference numeral 1002 denotes an example of the time display. Alternatively, as shown in FIG. 3, both the number of images and the time may be displayed on the same screen, and the current mode (the still image recording mode in FIG. 3) may blink.
[0012]
The address information generation circuit 19 receives data such as information storage status from the memory controller 15 and transfers the data to the ID signal generation circuit 12 as information indicating a data amount of each information. The ID signal generation circuit 12 generates a time code, image quality, audio mode selection and the like based on information from the system controller 16, and based on information from the memory controller 15, a video and audio data amount (variable). A data length in the case of long encoding) and a head address value in the memory storing the data are generated, and each ID is grouped as one data block, and the data synthesis circuit 13 forms a data block. The head address of the main memory where the data block is stored is sequentially written to the ID file in the main memory 14.
[0013]
FIG. 4 shows an example of data storage in the main memory 14 composed of a solid-state memory. When the horizontal axis is the time axis as shown in the upper part of FIG. 4, ID data is generated every predetermined time T0 and numbered 01, 02, 03... From the top. It is stored in the address space of the solid-state memory shown below, and after the ID data, video and audio information data having different data amounts for each processing period are sequentially stored by variable length coding. Therefore, the ID data is generated at regular intervals (T ₀ ), but they are not equally spaced in the address space on the memory as shown. Therefore, in order to enable high-speed access to the data block at the time of the search, an ID file in which addresses indicating storage locations of the data block are collected is generated. In the ID file, only the first address of the data block is stored in a predetermined area in an orderly manner according to the storage capacity of the main memory.
[0014]
In such a data block, the ID data has a fixed length, and in the example of FIG. 4, has a total of ten types of basic information. As these basic information, image quality and sound quality are selected by trade-off with time code and recording time, and the start address and data amount of each data of variable length audio and video are stored. The determination of the video system selects the expansion or compression system according to the input video information. The deleted flag is a flag that, when erasing data once recorded, sets a logically erased state that can be restored before physical deletion and processing, and inhibits normal reproduction by the flag.
[0015]
The audio data includes initialization information (reset data) for each of the L and R channels and variable-length audio data that has been subjected to compression processing. The video data is composed of, for example, an initialization screen (video reset data) by intra-frame coding or the like and compressed data that has been subjected to variable-length coding by various compression methods. For each ID data, the video data and the audio data having the above configuration constitute a data block as one set, and this data block is characterized in that it is generated at intervals defined by a time axis.
[0016]
FIG. 5 shows an example of the next video signal. Here, an input signal is a TV signal having an aspect ratio of 9:16 based on an HDTV (1125 vertical) TV signals. The HDTV signal has approximately 2.5 times the resolution in the horizontal direction and twice the resolution in the vertical direction as compared with the NTSC signal, and generates a total of 5 times information for 30 screens per second. Supplied to
[0017]
This video signal is converted into digital data by the A / D converter 9 in FIG. 1, and then the component signal (Y: RY: BY = 4: 2: 2) is sent to the video signal processing circuit 10. Is entered. Here, if the luminance (Y) per pixel is 8-bit and the color difference is 8-bit quantized at a sampling rate of 1/2 each, the result is 1.2 Gbps. Then, a 1/200 compression process is performed to reduce the data amount to about 6 Mbps.
[0018]
Since the data rate of a stereo sound signal having sound quality equivalent to that of a compact disc is 1.5 Mbps, the data rate is reduced to 0.3 Mbps by performing a 1/5 compression process. Thus, the total AV is about 6.3 Mbps. Therefore, recording can be performed at 1 Gbit for 10 minutes. In addition to the video signal, NTSC / PAL of the current standard TV broadcasting system, as well as H.264. H.261 may be in the form of QCIF or CIF, which are international standards for videophones. By such data processing, AV data is stored in the main memory 14, but it is also possible to add a main memory or adopt a replaceable memory form such as an IC card.
[0019]
Next, at the time of reproduction, when a reproduction operation is instructed by the operation keys 17, the system controller 16 displays a message indicating that the reproduction operation is being performed on the display section 18, and the memory controller 15 controls the memory address and read / write. The stored information signal is read from the memory 14. In the above example, the information is video information of 30 screens per second, a stereo (or 2 channels) audio signal, and ID information for searching these.
[0020]
Information is supplied to the data distribution circuit 21 in a state where the above three types of data are mixed (serial data information). In the data distribution circuit 21, data is distributed as follows. The video data is subjected to data decompression processing opposite to the data compression processing at the time of recording by the video data decompression circuit 22, reproduces a video signal equivalent to the input signal at the time of recording, and outputs it to the data selection circuit 23. . The data selection circuit 23 outputs data to be supplied to the adder 24 and the digital video output terminal 25 with the analog video monitor video signal.
[0021]
As for the ID data, information as shown in FIG. 4 is detected for each ID by the search information reproducing circuit 26, display information for monitoring is generated by the display information generating circuit 27, and added to the restored video data. The D / A converter 28 converts the signal into a general-purpose raw analog signal and displays it on a video monitor 29.
[0022]
The audio data is also subjected to data compression processing at the time of recording by the audio data expansion circuit 30 in the same manner as video data, and an audio signal equivalent to an input signal at the time of recording is reproduced. The data selection circuit 23 outputs data to be supplied to the A / D converter 32 and the digital audio terminal 33 which perform analog conversion for output to the acoustic monitor 31. Each of the video and audio data is reproduced by using the above-mentioned ID signal by correcting a deviation due to a delay time required for reproduction signal processing or the like. The video and audio reproduction signals are output from the data selection circuit 23 in synchronization with the information from the display information generation circuit 27.
[0023]
Next, FIG. 6 shows a data file configuration adopted for improving the data searchability, which will be described below. FIG. 6 shows a configuration example of the time file and the table of contents file. The index information can be set from level I to level IV. In this embodiment, the above-mentioned large, medium and small headings are assigned to levels I to III, respectively, and since level IV is unused, all zeros are assigned. An index word is configured in the minimum level unit.
[0024]
In the ID file item, the start ID number and end ID number, in the time file item, the start time, date, hour, minute, and second are required. In the table of contents file item, the index information item is necessary. The table of contents name of the index is registered according to. Of course, it may be blank.
[0025]
The time file is for storing the time at which the instruction to generate the index information was issued as time data in the ID file corresponding to the AV data being input, so that a search operation based on the time can be performed quickly. As described above, since the ID file is generated at fixed time intervals, if the shooting start time and the end time are known, it is possible to associate an arbitrary time in the middle with the AV data. The table of contents information in the table of contents file corresponds to a chapter or a paragraph in a book, and corresponds to a movement or a bar in music.
[0026]
FIG. 7 schematically shows the configuration of FIG. 7, an index generation circuit 41 is provided in the ID signal generation circuit 12 of FIG. 1, generates a time file 42 and a table of contents file 43, and stores them in the ID file 44. Then, it is further stored in an AV data file 45 formed in the main memory 14. The information processing circuit 46 represents one processing circuit for audio signals and video signals, and the information input / output circuit 47 represents one A / D or D / A converter.
[0027]
Next, a file creation operation at the time of recording will be described with reference to the flowchart of FIG. When an instruction is input by the operation key 17 in step 601 while video and audio signals are being input from the input terminals, it is determined in step 602 whether or not the command is a recording start command. move on. In step 603, it is determined whether or not the date has changed. If the date has changed, the flow advances to step 604 to update the level I, which is the main index heading, and the flow advances to step 605. If the date has not changed, go directly to step 605.
[0028]
In step 605, it is determined whether or not the power supply has been operated. If the power supply has been operated, the flow advances to step 606 to update the level II, which is the headline in the index, and the flow advances to step 607. If the power supply has not been operated, the process proceeds directly to step 607. In step 607, the level III, which is a subheading of the index, is updated, and the flow advances to step 608. In step 608, the date is stored in the time file, and in step 609, the hour, minute, and second are stored in the time file. Then, the process proceeds to step 610, where it is determined whether or not to attach the table of contents information. If so, the process proceeds to step 611, the attached table of contents information is stored in the table of contents file, and the process proceeds to step 612. If not, go directly to step 612.
[0029]
In step 612, a start ID number is set, and the flow advances to step 613 to start updating the ID file. Then, it is determined in step 614 whether or not the photographing has been completed. If the photographing has been completed, the process proceeds to step 615, where an end number is set. Then, the process proceeds to step 616 to end the update of the ID file, and a series of operations ends. These processes are performed by the ID generation circuit 12 in FIG.
[0030]
Next, a file search operation during reproduction will be described with reference to the flowchart of FIG. First, in step 701, it is determined whether or not to search using a time file. If the search is to be performed, the flow advances to step 702 to set search conditions such as a start date, a start time, and the like. Then, the process proceeds to step 703, where a search condition expression is generated, and in step 704, a time file is searched. Then, in step 705, it is determined whether or not the condition is satisfied. If the condition is satisfied, the process proceeds to step 706, and the index is extracted. If not, step 704 is repeated.
[0031]
If the search by the time file is not performed in step 701, the process proceeds to step 708 to perform the index search. Then, proceeding to step 709 to search for a change in the index, proceed to step 709 to determine whether there is a table of contents, otherwise return to step 708. If there is a table of contents, the process proceeds to step 710 to display the name of the table of contents, and then proceeds to step 712. If there is no table of contents, the process proceeds directly to step 712. In step 712, an index is selected, and the flow advances to step 713.
[0032]
In step 713, the start ID is read, and the flow advances to step 714 to read the end ID number. Then, the ID file is accessed in step 715, and the start AV address is read in step 716. Then, the end AV address is read in step 717, and the AV file is accessed in step 718. Then, in step 719, the AV data is reproduced, and in step 720, it is determined whether or not the address is completed. If not completed, the process returns to step 719. If completed, the process proceeds to step 721 to search for a time file and end a series of operations.
[0033]
With the above-described configuration, even when a moving image and a still image are mixed and recorded, the remaining amount of the memory can be accurately known in a short time for both the moving image and the still image.
[0034]
【The invention's effect】
According to the present invention, the user can be notified of the remaining recordable number of still images as well as the remaining recordable time of a moving image .
[Brief description of the drawings]
FIG. 1 is a configuration block diagram of an embodiment of the present invention.
FIG. 2 is a schematic diagram of a display unit according to the embodiment of the present invention.
FIG. 3 is a schematic diagram of a display unit according to the embodiment of the present invention.
FIG. 4 is a configuration diagram of a main memory according to the embodiment of the present invention.
FIG. 5 is a configuration diagram of a video signal according to the embodiment of the present invention.
FIG. 6 is a configuration diagram of a data file according to the embodiment of the present invention.
FIG. 7 is a configuration block diagram of an embodiment of the present invention.
FIG. 8 is a flowchart at the time of recording according to the embodiment of the present invention.
FIG. 9 is a flowchart at the time of reproduction according to the embodiment of the present invention.
[Explanation of symbols]
18 Display unit 20 Calendar clock generation circuit

Claims (8)

A recording device for recording moving images or still images on the same recording medium,
What is claimed is: 1. A recording apparatus, comprising: control means for performing processing for displaying both the remaining recordable time of a moving image and the remaining recordable number of still images on the same screen. The control unit performs a process of displaying both the remaining recordable time of a moving image and the remaining recordable number of still images on the same screen . A first function of recording a moving image on the recording medium is selected. 2. The recording apparatus according to claim 1, wherein the recording is performed occasionally. The control means performs processing for displaying both the remaining recordable time of a moving image and the remaining recordable number of still images on the same screen. A second function of recording a still image on the recording medium is selected. The recording apparatus according to claim 1, wherein the recording is performed when the recording is performed. The recording apparatus according to claim 1, wherein the recording medium is a solid-state memory. The recording apparatus displays, when the first function is selected, that a first function for recording a moving image on the recording medium is selected, and a second function for recording a still image on the recording medium. The recording apparatus according to any one of claims 1 to 4, wherein the fact that the second function is selected is displayed when the second function is selected. The recording apparatus according to claim 1, wherein the recording apparatus is an apparatus including the recording medium. A recording device incorporating a recording medium,
Selecting means for selecting a first function of recording a moving image on the recording medium or a second function of recording a still image on the recording medium;
When the first function is selected, a process for displaying the remaining recordable time of the moving image is performed. When the second function is selected, the remaining recordable number of still images is displayed. And a control means for performing the processing of (1). The recording apparatus according to claim 7, wherein the recording medium is a solid-state memory.

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