JP2002112171A - Recording device for moving image - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a moving image recorder that can prevent required moving image data from being missing due to deviation or the like in operation timing. SOLUTION: The moving image recorder utilizes a magnetic disk which is a 2nd recording medium for backup recording, while recording a moving image on a write enable optical disk being a 1st storage medium as a major object and records, even moving image parts not recorded on the optical disk on the magnetic disk at a low rate. On the occurrence of wrong recording of the moving image onto the optical disk, the moving image recorder allows dubbing of the required moving image part from the magnetic disk to the optical disk.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving picture recording apparatus for compressing and recording moving picture signals, and more particularly to a moving picture recording apparatus for recording a compressed and encoded moving picture on a storage medium such as a writable optical disk. Related to the device.

[0002]

2. Description of the Related Art A large amount of video signal is transmitted with little data.
Moving image coding technology for storing is, for example, MPEG.
Practical use is progressing as represented by the 2 video standard (ISO / IEC13818-2). According to the MPEG2 video standard, one screen is divided into a plurality of 8-pixel × 8-pixel blocks, each block is subjected to a discrete cosine transform (hereinafter referred to as DCT), and the obtained DCT coefficients are quantized to obtain a variable-length code. It is based on Also, by using the motion compensation inter-picture prediction together, the coding efficiency is enhanced by utilizing the correlation of the images in the time direction.

[0003] By using such a moving picture coding technique, a DVD (Digital Versatile) can be used.
For example, a long time video data can be recorded and supplied to a storage medium such as a disc.

[0004] Furthermore, recording of compression-encoded video data on a writable optical disk such as a DVD-RAM or a DVD-R is also coming into practical use. Writable optical disks include types that can be rewritten (erased and re-recorded) as many times as DVD-RAM, and DVDs.
There is a type that can be written only once, such as -R.
These are collectively called writable optical disks.

The capacity of writable optical disks has been increasing, but the capacity is limited. Therefore, there is a demand for recording only necessary portions as much as possible and not recording unnecessary portions. For this purpose, recording is manually turned on / off while watching the screen, timer recording, EPG (Electroni
c Program Guide), scheduled recording based on some keyword information, or the like. Alternatively, it is conceivable not to record the CM part by an automatic commercial (CM) cut function or the like.

[0006]

However, such a method for selecting a record has a problem that an important part is not recorded. For example, it is possible to make mistakes in operation or deviation of operation timing in manual operation, change the time of a program in timer recording, improper keywords to use in selection using keyword information, incorrect discrimination between CM and main part in automatic cut, etc. There is.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a moving image recording apparatus capable of saving only a necessary portion of an input image to a recording medium in a short time without failure. And

[0008]

In order to achieve the above object, a moving picture recording apparatus according to the present invention comprises a compression coding means for compressing and coding an input moving picture signal to generate compressed moving picture data; A first storage medium for recording the image data, a second storage medium for recording the compressed moving image data, a recording selecting means for designating a part of the compressed moving image data to be recorded on the first storage medium, Control means for recording the compressed moving image data designated by the recording selecting means on the first storage medium, and recording a portion of the compressed moving image data not designated by the recording selecting means on the second storage medium. are doing.

Thus, even if the part to be recorded on the first storage medium is erroneously designated by manual or automatic selection, the compressed moving image data is recorded on one of the first and second storage media. Recording important parts can be prevented from being missed.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

In this embodiment, it is assumed that a moving image signal input from, for example, a television broadcast or a separately provided imaging unit is compression-encoded using a moving image encoding method such as MPEG2 and recorded.

First, a first embodiment of the present invention will be described.

In this embodiment, while the main purpose is to record on a writable optical disk which is the first storage medium,
The magnetic disk serving as the second recording medium is used as background recording, and a portion that is not recorded on the optical disk is also recorded on the magnetic disk at a low rate, thereby eliminating the possibility of recording failure.

FIG. 1 is a schematic configuration diagram of a moving image recording apparatus according to the first embodiment.

This moving picture recording apparatus has a moving picture input terminal 101 connected to a video source (not shown). An input video, which is a moving image signal input from the input terminal 101, is supplied to a compression encoding unit 102, where compression encoding such as MPEG2 is performed. The recording switching unit 103 has input terminals A and B and output terminals C and D. Compression encoding section 102
Is supplied to the input terminal A of the recording switching unit 103. Output terminal C of recording switching section 103
Is connected to the optical disk recording unit 104. The optical disk recording unit 104 mainly performs a physical layer recording process such as error correction coding and modulation necessary for data recording, and records the compressed moving image data on the rewritable optical disk 105. The output terminal D of the recording switching unit 103 is connected to the magnetic disk recording unit 106
Connected to. Similarly to the optical disk recording unit 104, the magnetic disk recording unit 106 mainly performs recording processing of a physical layer such as error correction coding and modulation necessary for data recording, and records compressed moving image data on the magnetic disk 107. The optical disk reproducing unit 108 reads the moving image data recorded on the optical disk 105, and performs error correction coding processing and reproduction.
The magnetic disk reproducing unit 109 reads moving image data recorded on the magnetic disk 107, and mainly performs a physical layer reproducing process such as demodulation and error correction decoding. Playback switching unit 11
0 has input terminals E and F and an output terminal G. The moving image reproduction data of the optical disk 105 read from the optical disk reproduction unit 108 is supplied to the input terminal E of the reproduction switching unit 110. The moving image reproduction data of the magnetic disk 107 output from the magnetic disk reproduction unit 109 is reproduced by the reproduction switching unit 110.
Is supplied to the input terminal F. The output terminal G of the reproduction switching unit 110 is connected to the input terminal B of the recording switching unit 103. The output terminal G of the playback switching unit 110 is connected to the compression decoding unit 111.
Is also connected. The data output from the output terminal G of the playback switching unit 110 is subjected to compression decoding (expansion) processing by the compression decoding unit 111, and is output from the video output terminal 112 as a playback video signal. The recording selection unit 113 manually or automatically specifies a portion to be recorded on the optical disk 105 with respect to the input moving image signal, and sends a recording selection signal as a result to the control unit 114. The control unit 114 controls each unit.

The compression encoding unit 102 changes the parameters of the compression encoding under the control of the control unit 114. In particular, by changing the average coding rate (the coding rate itself in the case of fixed rate coding, or the average coding rate in the case of variable rate coding), the recording quality and the recording time to the storage medium are changed. Here, two types of SP mode (high-quality mode with high average coding rate) and LP mode (long-time recording mode with low average coding rate) can be set. Note that the number of horizontal or vertical pixels on the screen may be changed in the SP mode and the LP mode, or the pre-processing for encoding may be changed.

The recording switching section 103 selects one of the compressed moving image data from the input terminal A or B in accordance with the control from the control section 114, and outputs it exclusively from one of the output terminals C and D. . The reproduction switching unit 110 supplies one of the compressed moving image data from the input terminal E or F to the output terminal G under the control of the control unit 114. When the input terminal B of the recording switching unit 103 is selected, dubbing from the optical disk 105 to the magnetic disk 107,
Alternatively, dubbing from the magnetic disk 107 to the optical disk 105 can be executed. That is, the selection of the input terminal E and the output terminal G of the reproduction switching unit 110 and the combination of the input terminal B and the output terminal D of the recording switching unit 103 are combined.
5 from the optical disk 105 to the magnetic disk 107 by the selection of the input terminal F and the output terminal G of the reproduction switching unit 110 and the combination of the input terminal B and the output terminal C of the recording switching unit 103. I can do it.

The recording selector 113 manually or automatically designates a portion of the input moving image signal to be recorded. In the case of manual operation, recording is started / operated by an operation from an operation unit (not shown).
Stop recording is specified. In the case of automatic, recording start and stop are designated according to the date and time by timer recording reservation or EPG reservation recording. Also, in the case of keyword selection recording,
In accordance with keyword information supplied separately, recording of information matching the keyword or genre registered in advance by the user is started. In the case of CM cut recording, recording start and stop are determined by using a difference (for example, a difference in audio mode) between the CM and the main part. The recording selection signal resulting from these results is supplied to the control unit 114.

The control unit 114 performs control by supplying a control signal to each unit. In particular, control of coding parameters (especially coding rate) of the compression coding unit 102, path switching control of the recording switching unit 103 and reproduction switching unit 110, recording control of the optical disk recording unit 104, recording control of the magnetic disk device 106, etc. Is a control function according to the present embodiment.

Next, the operation of the moving picture recording apparatus according to the first embodiment will be described with reference to FIGS. FIG. 2 is a time chart for explaining the recording control method according to the first embodiment. In FIG. 2, the horizontal axis represents time.

At the time of initial recording of an input image (hereinafter, referred to as primary recording), the compression encoding unit 102 responds to the recording selection signal 121 from the recording selecting unit 103 in the SP mode or the L mode.
The encoding of the input image is performed while switching the P mode. That is, the compression encoding unit 102 compression-encodes an input image portion selected for recording in the SP mode, and compression-encodes an input image portion not selected for recording in the LP mode. Data compressed and encoded in the SP mode or the LP mode is input to the input terminal A of the recording switching unit 103. Recording switching unit 1
03 electrically connects the input terminal A and the output terminal C when the compression coded data is input to the input terminal A in the SP mode according to the control signal 123 of the control unit 114. Thus, the data compressed and encoded in the SP mode is sent to the optical disk recording unit 104 and recorded on the optical disk 105. The recording switching unit 103 controls the control signal 1
23, the input terminal A and the output terminal D are electrically connected when the compression encoded data is input to the input terminal A in the LP mode. Thus, the data compressed and encoded in the LP mode is sent to the magnetic disk recording unit 106 and recorded on the magnetic disk 107.

Subsequently, at the time of editing recording (hereinafter referred to as secondary recording), the magnetic disk 10 is designated by the user.
7 is dubbed to the optical disc 105. At this time, the reproduction switching unit 110 uses the control signal 125 of the control unit 114 to
The input terminal F and the output terminal G are electrically connected. Also,
The recording switching unit 103 electrically connects the input terminal B and the output terminal C according to the control signal 123 of the control unit 114. Thus, at the time of secondary recording, data to be dubbed is transferred from the magnetic disk 107 to the optical disk 105 via the magnetic disk reproducing unit 109, the input terminal F, the output terminal G, the input terminal B, the output terminal C, and the optical disk recording unit 104. Be recorded.

As described above, by executing the steps of the primary recording and the secondary recording, necessary compressed moving image data can be stored on the optical disk 105 in a short time without failure. Note that, of the data recorded on the magnetic disk 107, the optical disk 10
The data dubbed to No. 5 may be automatically deleted.

Here, the compressed moving image data is stored on the optical disk 1
05 is recorded on either the magnetic disk 105 or the magnetic disk 107. Whether or not to perform the recording operation in the constant recording mode is performed by any of the following or a combination thereof.

(1) The recording mode is always set while the power is on.

(2) The user manually turns the recording mode on and off manually.

(3) When the recording operation is first performed after the power is turned on, the recording mode is always turned on, and the optical disk 105 is turned on.
When recording to the optical disc 105 is not instructed for a predetermined time (for example, one hour) after the recording to the optical disc 105 is stopped, the operation is turned off.

Next, another recording control method according to the present embodiment will be described with reference to FIGS. FIG. 3 is a time chart for explaining another recording control method according to the present embodiment.

In this recording control method, the compression encoding unit continues the compression encoding in the SP mode for a predetermined time T1 even after the recording selection signal instructs the stop of the recording in the primary recording. At this time, the recording itself is performed simultaneously with the recording stop instruction.
From 05, recording is switched to recording on the magnetic disk 107. Therefore, during the time T1 after the recording of data is switched to recording on the magnetic disk 107, recording in the SP mode is performed, and then recording in the LP mode is performed.

According to this method, the data is recorded on the magnetic disk 107 in the SP mode for the time T1 even if the recording stop operation is slightly too early in the manual operation. SP for T1
Dubbing can be performed on the optical disk 105 in the mode. Time T1
May be specified, for example, between about 1 second and 1 minute, but is not limited to this. If the time T1 is long, the capacity of the magnetic disk 107 is consumed quickly, but the permissible error in the recording timing increases. Even after the time T1 has elapsed, at least the recording operation in the LP mode is performed, so that dubbing in the LP mode can be performed in the same manner as in FIG.

As described above, according to the present embodiment, during the period when the recording is not performed on the optical disk in the primary recording, at least the data at the low coding rate is recorded on the magnetic disk. By doing so, it is possible to prevent the necessary contents from being lost. In addition, since the data is recorded on the optical disk in the primary recording, the operation can be performed in a shorter time than the method of recording all the data on the magnetic disk and then dubbing the necessary portion to the optical disk. In addition, the capacity of the optical disk may be small because the magnetic disk is used in an auxiliary manner.

Next, a second embodiment of the present invention will be described.

In the second embodiment, a delay unit is provided before the compression encoding unit, so that not only the part immediately after the recording on the optical disc is stopped but also the part immediately before the recording on the optical disc is started can be performed by the SP. This enables recording on a magnetic disk in mode.

FIG. 4 is a schematic configuration diagram of a moving image recording apparatus according to the second embodiment. In FIG. 4, the same parts as those in FIG. 4, a temporary compression unit and a delay unit 402 are added to FIG.

An input video, which is a moving image signal input from the input terminal 101, is supplied to the temporary compression section 401. The temporary compression unit 401 compression-encodes the input image at a low compression rate. The data compressed and encoded by the temporary compression unit 401 is
And is supplied to the compression encoding unit 102 after being delayed. The temporary compression section 401 is provided to save the capacity of the delay section 402 and may be omitted.

Here, a recording control method according to the second embodiment will be described with reference to FIG. FIG. 5 is a timing chart for explaining a recording control method according to the second embodiment.

In the second embodiment, the compression encoding is performed after the input image signal is delayed by the time T2 in the primary recording. Then, switching is performed by the recording switching unit 103 at a timing delayed by the time T2 of the recording switching signal, and recording on the optical disk 105 and recording on the magnetic disk 107 are switched. Here, switching between the SP mode and the LP mode is performed simultaneously with the start of recording of the original recording selection signal.
The mode is switched from the P mode to the SP mode, and the mode is switched from the SP mode to the LP mode after a time (T1 + T2) from the stop of the recording of the original recording selection signal. That is, the magnetic disk 10
7, the first time T1 and the last time T2 are in the SP mode, and the rest are in the LP mode.

According to this method, for example, in the case of a manual operation, even when the recording start operation is slightly slow, recording is performed in the SP mode on the magnetic disk 107 by an extra time T2 just before the recording start operation. By performing the secondary recording, the portion can be dubbed to the optical disk 105 in the SP mode. The time T2 may be, for example, from 1 second to 1 minute, but is not limited thereto. Since the recording is performed at least in the LP mode before the time T2 or more, dubbing of a necessary portion can be executed.

As described above, in this embodiment, in addition to the features of the first embodiment, the portion immediately before the portion to be recorded on the optical disk is recorded on the magnetic disk in the high image quality mode. Even if the start timing is delayed, by performing the secondary recording later, it is possible to dub the failed recording portion on the optical disc with high image quality. That is,
It is possible to trim recording start / end points on the optical disc with high image quality.

The present invention is not limited to the first and second embodiments, but may use a magnetic disk, a semiconductor memory, or a magnetic tape in place of the optical disk, and use a compression encoding method other than MPEG2. It may be used, and audio data and other sub-information may be recorded at the same time as the recording information in addition to the moving image. The compression encoding may be processed by software instead of hardware. May be not only two types of the SP mode and the LP mode but also three or more types, and the coding rate may be continuously variable instead of discrete.

[0041]

As described above, according to the present invention, it is possible to provide a moving image recording apparatus capable of recording only a necessary portion of an input video on a recording medium in a short time without failure.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a moving image recording apparatus according to a first embodiment.

FIG. 2 is a time chart for explaining a recording control method according to the first embodiment.

FIG. 3 is a time chart for explaining another recording control method according to the first embodiment.

FIG. 4 is a schematic configuration diagram of a moving image recording device according to a second embodiment.

FIG. 5 is a timing chart illustrating a recording control method according to a second embodiment.

[Explanation of symbols]

 102 Compression encoding unit 103 Recording switching unit 104 Optical disk recording unit 105 Optical disk 106 Magnetic disk recording unit 107 Magnetic disk 108 Optical disk reproducing unit 109 Magnetic disk reproducing unit 110 Reproduction switching unit 111 Compression decoding unit 113 Recording selection unit 114 Control unit 401 Temporary compression Unit 402 delay unit

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/85 H04N 5/92 H 5/92 F term (Reference) 5C052 AA01 AA03 AB02 AB09 CC06 CC11 DD04 5C053 FA15 FA23 FA24 GB37 HA21 HA32 HA33 JA01 JA21 KA08 KA24 5D044 AB05 AB07 BC01 BC04 CC04 DE75 EF10 GK10 5J064 AA02 BB10 BC02 BC21 BC25 BD03

Claims (7)

[Claims] 1. A moving image recording apparatus that compresses and codes an input moving image signal and records the compressed moving image signal, wherein the compression moving unit compresses and codes the input moving image signal to generate compressed moving image data; A first storage medium for recording image data, a second storage medium for recording the compressed moving image data, and a recording selecting unit for designating a part of the compressed moving image data to be recorded on the first storage medium And recording the compressed moving image data specified by the recording selecting means on the first storage medium, and replacing a portion of the compressed moving image data not specified by the recording selecting means with the second storage medium. A moving image recording apparatus comprising: 2. The method according to claim 1, wherein the control unit sets an average encoding rate of the compression encoding unit during recording on the first storage medium to at least a part of a period during recording on the second storage medium. 2. The moving picture recording apparatus according to claim 1, wherein an average encoding rate of said compression encoding means during a period is higher than an average encoding rate. 3. The method according to claim 1, wherein the control unit is configured to perform a period for performing recording on the first storage medium and a period for performing recording on the second storage medium and immediately after the period for performing recording on the first storage medium. 2. The moving picture recording apparatus according to claim 1, wherein an average encoding rate of said compression encoding means in a predetermined period of time is higher than an average encoding rate of said compression encoding means in a period after said predetermined period. . 4. The apparatus according to claim 1, wherein said control means includes a period for recording on said first storage medium and a period for recording on said second storage medium, immediately after the period for recording on said first storage medium. 2. The average encoding rate of the compression encoding unit during a period other than the predetermined period and an average encoding rate of the compression encoding unit during a period other than the predetermined period. Moving image recording device. 5. A moving picture recording apparatus for compressing and coding an input moving picture signal and recording the same, comprising: a compression coding means for performing compression coding on the input moving picture signal to generate compressed moving picture data; 1 storage medium; first recording means for recording the compressed moving image data on the first storage medium; second storage medium; and recording the compressed moving image data on the second storage medium. A second recording unit, a recording selection unit that designates a portion to be recorded on the first storage medium, and controlling the first recording unit and the second recording unit based on control from the recording selection unit Control means for performing the first and second recording so that the compressed moving image data is continuously recorded in one of the first and second storage media. Means for controlling A moving image recording apparatus characterized in that an average coding rate in the compression encoding means during a period of recording on a storage medium is higher than an average encoding rate in the compression encoding means during other periods. . 6. A moving picture recording apparatus for compressing and coding an input moving picture signal and recording the same, comprising: a compression coding means for performing compression coding on the input moving picture signal to generate compressed moving picture data; 1 storage medium; first recording means for recording the compressed moving image data on the first storage medium; second storage medium; and recording the compressed moving image data on the second storage medium. Second recording means; reproducing means for reproducing the compressed moving image data from the second storage medium; and switching for guiding the compressed moving image data reproduced from the reproducing means to the first recording means. Means, selecting means for designating a portion to be recorded on the first storage medium, and control means for controlling the first or second recording means based on control from the selecting means, The control means includes: In the recording step, the first such record of the compressed moving image data to one of said first storage medium or said second storage medium is continued
And controlling the second recording means, and in a second recording step, transferring at least a part of the compressed moving image data recorded on the second storage medium under the control of the switching means to the first storage medium. A moving image recording apparatus characterized in that the moving image is recorded in a moving image recording apparatus. 7. The moving image recording apparatus according to claim 1, wherein the first storage medium is a writable optical disk, and the second storage medium is a magnetic disk.