Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1999-04-28
2001-12-11
Tran, Thai (Department: 2615)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000, C386S349000
Reexamination Certificate
active
06330394
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a recording and playing-back device, more particularly, to a recording and playing-back device which record a digital video image and audio or user data on a disk media such as a magneto-optical disk, a phase change disk, or a magnetic disk in order to play back the digital video image and audio or the user data.
As a conventional read only device for reading digital video data recorded on a disk, a digital versatile disk device (to be referred to as a DVD hereinafter) is known. The DVD is a disk, having a diameter of 12 cm, on which 4.7-Gbyte compressed digital video/audio data is recorded. When the data is read, video/audio signals can be played back for two or more hours. Similarly, as a device for recording/playing-back digital data on a disk, a digital versatile disk random access memory device (to be referred to as a DVD-RAM hereinafter) exists. This DVD-RAM is a device for recording 2.6-Gbyte digital data on a phase change disk having a diameter of 12 cm. A user can repeatedly record and play back the digital data from the disk.
By the way, navigation data may exist in the DVD. The navigation data is not video/audio data itself, and is disk management information which makes the video/audio data of the disk maximally effective. The disk management information is recorded on the entire surface of the disk once or a plurality of times, and has the following contents.
(1) A specific position where a program is stored, and the type of this program. The relationship between a program number and an address in header searching is recorded.
(2) Data for special play-backs (fast play-back, rewind play-back, and slow-motion play-back). Data which represents the number of times of a speed at which the head is jumped to the next address, and represents the next address is recorded.
(3) A specific address at which data is preferably played back when a multi-language (Japanese and English) is selected.
(4) A specific address at which data is preferably played back when a multi-angle (directions to the center fielder and the catcher in a broadcast on a baseball game) is selected.
(5) A specific address at which data is preferably played back when a multi-story (happy ending and sad ending) is selected.
When the DVD is a read only disk, the navigation data is not changed once the navigation data is recorded on the DVD. If the disk is programmable, the data can be changed. Data which can not be really used also exists on the disk. For example, in cases of the above-mentioned (1) and (2), since video/audio data is a variable length code, when the video/audio data is updated, the navigation data must be updated over a wide range. In cases of the above-mentioned (3), (4), and (5), multi-data cannot be recorded on real time in consideration of play-back synchronization. More specifically, the navigation data is made in consideration of a read only disk, but is not made in consideration of updating. With respect to a DVD-RAM, although an example of recorded video data is described above, video recording is not actually considered, and the concept of navigation data for recording video data does not exist.
SUMMARY OF THE INVENTION
It is an object of this invention to provide a recording and playing-back device capable of carrying out accurate header searching, a high-quality special play-back, and an edition for updated data at a high speed.
It is another object of this invention to provide a method of recording and playing-back capable of carrying out accurate header searching, a high-quality special play-back, and an edition for updated data at a high speed.
Other objects of this invention will become clear as the description proceeds.
According to a first aspect of this invention, there is provided a recording/playing-back device comprising a video/audio coding circuit for performing compression coding and multiplexing of an input video/audio signal, a control error correction code block generating circuit for generating a control error correction code block under the control of a central processing unit control circuit, a recording signal processing circuit for performing shuffling, addition of an error correction code, and record coding to an output signal of the video/audio coding circuit and for multiplexing the video/audio signal and the control error correction code block, an optical head for recording output data of the recording signal processing circuit on a disk, a play-back signal processing circuit for performing record code decoding, error correction, and deshuffling to data played back from the disk by the optical head, a video/audio decoding circuit for decoding video/audio data on the basis of an output of the play-back signal processing circuit to output the video/audio data as a video/audio signal, and a control error correction code block playing-back circuit for playing back a control error correction code block on the basis of an output of the play-back signal processing circuit and for causing the central processing unit control circuit to control the optical head and a spindle motor on the basis of the control error correction code block and an execution instruction.
According to a second aspect of this invention, there is provided a recording/playing-back method comprising the steps of performing compression coding and multiplexing to an input video/audio signal in a video/audio coding circuit, generating a control error correction code block from a control error correction code block generating circuit under the control of a central processing unit control circuit, performing shuffling, addition of an error correction code, and record coding to an output signal of the video/audio coding circuit and multiplexing the video/audio signal and the control error correction code block by a recording signal processing circuit, recording the multiplexed data on a disk by an optical head, performing record code decoding, error correction, and deshuffling to data played back from the disk by the optical head in a play-back signal processing circuit, causing a video/audio decoding circuit to decode video/audio data on the basis of an output of the play-back signal processing circuit, causing a control error correction code block playing-back circuit to play back a control error correction code block on the basis of an output of the play-back signal processing circuit, and causing the central processing unit control circuit to control the optical head and a spindle motor on the basis of the control error correction code block and an execution instruction.
REFERENCES:
patent: 5758013 (1998-05-01), Kizu et al.
patent: 5805537 (1998-09-01), Yamamoto et al.
patent: 6222982 (2001-04-01), Kaneshige et al.
NEC Corporation
Onuaku Christopher
Tran Thai
Young & Thompson
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