Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1998-06-04
2001-03-20
Nguyen, Huy (Department: 2615)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000
Reexamination Certificate
active
06205285
ABSTRACT:
BACKGROUNDS OF THE INVENTION
1. Field of the Invention
The present invention relates to a video CD reproduction controlling device and its controlling method for controlling reproduction of image data compressed and encoded by the MPEG-1 system recorded on a video CD.
2. Description of the Related Art
A video CD is capable of reproducing images and sounds for 74 minutes at the maximum, with compressed image data and sound data recorded in a time divided way on a CD-ROM format disk. Sounds and images including moving images and still images are recorded on a video CD in an efficient compress-encoding system by the MPEG-1 standard (hereinafter, referred to as the MPEG-1 system) regulated as the Advice ISO/IEC-11172-2 in 1993 by an expert group on ISO and CCITT (ISO/IEC, JTC1/SC2/WG8 (Moving Picture Expert Group: MPEG). The images and the sounds recorded on a video CD are reproduced by use of a video CD player with an MPEG video decoder and an MPEG audio decoder for respectively decoding MPEG-1 compression image data and MPEG-1 compression sound data mounted thereon.
FIG. 4
shows a schematic view of a construction of a disk for a video CD. With reference to
FIG. 4
, in the disk for the video CD, the data can be recorded on a lead-in L at the most inner portion, on a first track (T
1
), second track (T
2
), and third track (T
3
), successively to the maximum track
99
. The lead-in L is the same as the lead-in provided in a musical CD (compact disc), where the information on each starting position for every track and the other necessary control information is recorded as the TOC information. The first track (T
1
) is a video CD data track with various disk information recorded therein. Further, the reproduction information T
11
indicating the reproducing procedure of a disk and the image data T
12
including moving images and still images can be recorded on the first track (T
1
). The second track (T
2
) and the later are MPEG-AV tracks respectively with one moving image recorded thereon. The MPEG data obtained by the time division and multiplexing of the compression image data and the compression sound data is recorded on these tracks.
A reproducing method of images and sounds recorded on a video CD includes a method for reproducing them in an interactive manner according to the reproduction information T
11
recorded on the first track (T
1
) (referred to as reproduction with the playback control (PBC)-on) and a method for reproducing the second track (T
2
) and the later successively (referred to as reproduction with the PBC-off) regardless of the reproduction information T
11
.
FIG. 5
shows the constitution of the conventional video CD reproduction controlling device. The conventional video CD reproduction controlling device shown in
FIG. 5
comprises a CD drive
51
for reading out the data recorded on a video CD, a CD-ROM decoder
52
for decoding the data read out through the CD drive
51
so to supply the reproduction data, an MPEG decoder
53
for decoding the MPEG data to supply image signals and sound signals when the reproduction data supplied from the CD-ROM decoder
52
is MPEG data, and a controller
54
for controlling the CD drive
51
, the CD-ROM decoder
52
, and the MPEG decoder
53
.
The operation of the conventional video CD reproduction control in the case of PBC-off reproduction will be described with reference to the flow charts of
FIGS. 4
,
5
, and
6
. At the time of starting reproduction, if the PBC is set as off (Step
601
), the controller
54
sends the CD drive
51
a seek request for the head of the second track (T
2
) that is the reproduction starting track (Step
602
), in order to reproduce the images and sounds recorded on a disk set in the CD drive
51
, and the data is read out and reproduced from the second track (T
2
) (Step
603
). Namely, in case of the PBC-off reproduction, even if the image data T
12
is recorded on the first track (T
1
), the same image data will be never reproduced, because the moving images recorded on the second track (T
2
) and the later are reproduced. The image data T
12
recorded on the first track (T
1
) is to be reproduced only in case of the PBC-on reproduction.
Therefore, when a user wants to reproduce the images recorded on the first track (T
1
), he or she must select the PBC-on reproduction to perform the reproduction control of the video CD since it is impossible to reproduce the relevant images in the PBC-off reproduction.
There exists a video CD on which all the moving image data is recorded on the first track (T
1
) and no moving image data is recorded on the second track (T
2
) and the later. Although it is not against the video CD standards, such a video CD is incapable of reproducing the moving images completely when the PBC-off is selected.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a video CD reproduction controlling device and its controlling method capable of reproducing moving images recorded on the first track even in case of performing reproduction control of the video CD with the PBC-off.
Another object of the present invention is to provide a video CD reproduction controlling device and its controlling method capable of reproducing images recorded on the first track at the reproduction mode with the playback control off, thereby making it possible to reproduce, still at the reproduction mode with the playback control off, even such a video CD that only the first track includes moving images and the second track and the later tracks include no moving images.
According to the first aspect of the invention, a video CD reproduction controlling device, mounted with a video CD on which at least disk reproduction information indicating reproduction procedure for reproducing moving image data compressed and encoded in a predetermined compression method, is recorded on the first track and the compressed and encoded moving image data is, if necessary, recorded thereon, and the compressed and encoded moving image data is recorded on the second track and the later, for controlling reproduction of moving image data recorded on the video CD, the video CD reproduction controlling device comprises
a CD drive, mounted with a video CD, for reading out the data recorded on the video CD,
a first decoding means for decoding the data read out through the CD drive, so to supply reproduction data,
a second decoding means for decoding the moving image data, so to supply image signals and sound signals, when the reproduction data supplied from the first decoding means is the moving image data compressed and encoded by the predetermined compression method,
a storing means for storing the disk reproduction information read out from the first track, of the reproduction data supplied from the first decoding means, and
a controlling means for controlling the CD drive and the first and second decoding means,
the controlling means stores into the storing means, an address of the moving image data recorded on the first track, included in the disk reproduction information read out from the first track, of the reproduction data supplied from the first decoding means, and controls the CD drive and the first and second decoding means so as to reproduce the moving image data recorded on the first track by use of the address stored in the storing means, in the reproduction of the moving image data at the reproduction mode with playback control-off.
In the preferred construction, when storing into the storing means, the address of the moving image data recorded on the first track, the controlling means checks the data recorded on the first track in every one frame, so to judge whether the data is moving image data or not, and if judging that the data is moving image data, it stores the address of the data into the storing means.
In the preferred construction, the controlling means controls the first and second decoding means so as to reproduce the moving image data recorded on the first track and thereafter controls the CD-drive and the first and second decoding means so as to sequentially r
NEC Corporation
Nguyen Huy
Scully Scott Murphy & Presser
LandOfFree
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