Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1999-03-17
2004-03-23
Tran, Thai (Department: 2615)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000, C360S055000, C369S069000, C348S552000
Reexamination Certificate
active
06711343
ABSTRACT:
SPECIFICATION
Data recording/reproducing apparatus, file management method, file system information generation method, file management method, file system information generation apparatus, file system information analysis apparatus and medium.
TECHNICAL FIELD
The present invention relates to a data recording/reproducing apparatus for recording/reproducing digital stream data. Furthermore, it relates to a data recording/reproducing apparatus for recording/reproducing digital video and audio stream data as files.
BACKGROUND ART
Various digital interfaces and peripheral apparatuses connected thereto have been developed at present. In addition, it has been increasing to control the peripheral apparatuses by using personal computers, thereby to record/reproduce video and audio signals.
In accordance with the progress of such technologies, problems described below at 1) to 6) have been caused. Those conventional technologies and problems related thereto will be described below.
1) A control apparatus and a conventional recording/reproducing apparatus connected thereto will be described.
FIG. 43
is a block diagram showing the configuration of the conventional recording/reproducing apparatus. In
FIG. 43
, the numeral
401
represents a control apparatus, the numeral
402
represents a transmission line, the numeral
403
represents a recording/reproducing unit, the numeral
404
represents an operation panel, the numeral
415
represents an operation signal, the numeral
411
represents data, the numeral
413
represents a response, the numeral
412
represents a command, the numeral
408
represents a recording/reproducing apparatus, the numeral
406
represents an IEEE1394 Interface (hereinafter referred to as an I/F), the numeral
405
represents a processor, and the numeral
414
represents a control signal.
The operation of the recording/reproducing apparatus configured as described above will be described.
The control apparatus
401
is connected to the recording/reproducing apparatus
408
by the transmission line
402
. In the transmission and reception of the data
411
and the command
412
between the control apparatus
401
and the recording/reproducing apparatus
408
, the data
411
to be recorded is transmitted from the control apparatus
401
to the recording/reproducing unit
403
via the I/F
406
, and the command
412
is transmitted to the processor
405
during transmission; the reproduced data
411
is transmitted from the recording/reproducing unit
403
to the control apparatus
401
via the I/F
406
, and the response
413
to a specific command
412
required to be responded to the control apparatus
401
is transmitted in the same way from the processor
405
to the control apparatus
401
via the I/F
406
during reception. Furthermore, the operation panel
404
generates the operation signal
415
for instructing the operation of the recording/reproducing unit
403
; the processor
405
outputs the control signal
414
for controlling the recording/reproducing unit
403
to the recording/reproducing unit
403
; and the recording/reproducing unit
403
records the data
411
on a recording medium or reproduces the data
411
from the recording medium on the basis of the control signal
414
.
In the above-mentioned conventional configuration, when the processor
405
receives the operation signal
415
generated by the operation panel
404
during the transmission/reception of the data
411
and the command
412
between the control apparatus
401
and the recording/reproducing apparatus
408
, the processor
405
controls the recording/reproducing unit
403
on the basis of the operation signal
415
, whereby trouble occurs during the transmission and reception, causing a problem of making the recording/reproducing apparatus
408
malfunction.
2) Furthermore, the contents of data recorded on a recording medium are generally grasped only by an individual who carried out recording; in addition, efforts to attach a seal to the recording medium, to put a list in a cassette case and keep them together, and the like are required. Besides, in actual reproduction, in the case when the recording medium is a tape, search for portions where data is recorded is required while checking the contents by fast forward operation, thereby causing a problem of improper operability.
3) Furthermore, when MS-DOS is taken as an example for explanation, such a data recording apparatus as a hard disk (hereinafter referred to as an HDD) of a conventional personal computer (hereinafter referred to as a PC) is configured to have a boot sector having physical characteristics of the disk and a routine for booting (starting) the computer, a file allocation table indicating locations where individual files are recorded on the disk in cluster units, a root directory wherein the entries of files and subdirectories are recorded, and a file area wherein subdirectories and data are recorded, thereby being capable of recording files.
A file entry used as information regarding a file comprises information of 32 bytes including a file name (eight bytes), an extension (three bytes), a file attribute (1 byte), a creation date and time or the last renewal date and time (four bytes), a recording position (two bytes) indicated by the first cluster number, a file size (four bytes), etc. Among these, the file attribute is information for indicating what kind of characteristics the file has, and the individual bits thereof are supposed to indicate file/read-only/hidden file/system file/volume label/subdirectory/archive file, etc. Furthermore, the extension indicates what kind of computer software the file is compatible with.
In actual operation, the PC transmits commands to the HDD, and a data reading instruction and data the number of bytes of which has been designated are transmitted, whereby file data is read; in a similar way, a data writing instruction and data the number of bytes of which has been designated are received, whereby file data can be written. In reading/writing files, instructions are not issued in file units, but a proper byte length is designated and data is transferred; furthermore, since instruction issuing timing is not controlled, the transfer rate of file data is not constant. The rate depends on the inherent transfer rate of the HDD and the processing speed of the PC; furthermore, when the PC is carrying out another process, the processing speed of the PC may be affected thereby.
This kind of system cannot treat data required to have a real-time characteristic, in particular, video data, audio data, etc; however, since data treated by computers at present includes a lot of data required to have a real-time characteristic, such as video and audio data, the above-mentioned system is improper.
Furthermore, in the case when data is transferred to a sequentially recording/reproducing medium such as a tape instead of the HDD, repositioning, that is, a method wherein operation, interruption, slight rewinding and operation once again are repeated, is carried out to adjust the difference between the transfer rate and recording rate; however, since this operation takes time, and the actual transfer rate becomes lower. To solve this problem, a method of preventing the repositioning is available wherein the difference between the transfer rate and the recording rate is recorded as a dummy; however, if recording is carried out in accordance with this method, the amount of data treated in byte units is changed; when data is copied or moved between different recording media, checking empty areas and the like cannot be accomplished, even if attempted.
4) Furthermore, a home-use digital VCR “DV” (Digital Video) using a magnetic tape is available as a medium for storing multimedia information including video and audio data at present. It is now under consideration to connect this DV to a PC and to use it as a recording medium for the PC, just as a hard disk, a floppy disk, etc. existing at present.
In the case when data on an existing recording medium is treated in a file format, a file manag
Iketani Akira
Iltsuka Hiroyuki
Matsumi Chiyoko
Matsumoto Noriyuki
Yamada Masazumi
Matsushita Electric - Industrial Co., Ltd.
RatnerPrestia
Tran Thai
LandOfFree
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