US 8,045,844 B2Granted

Recording medium, playback apparatus, and integrated circuit

AssigneePanasonic Corporation

InventorsTaiji Sasaki, Hiroshi Yahata, Tomoki Ogawa, Wataru Ikeda

Life of this patent

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Abstract

A playback device includes a reading unit that reads extent blocks from a recording medium. A switching unit extracts a main-view stream and a sub-view stream from the extent blocks. Each stream is stored in a different read buffer. A decoding unit reads and decodes each stream from a corresponding read buffer. A time (t) required for the decoding unit to decode all data blocks in one extent block is greater than or equal to the sum (t1+t2+t3) of a time (t1) required for the reading unit to read the data blocks except for the top data block in the extent block, a time (t2) required for the reading unit to start to read the top of a next extent block from the time of finishing reading the tail of the extent block, and a time (t3) required for the reading unit to read the top data block in the next extent block.

Claims5

Dependent claims

A playback device for playing back video images from a recording medium having recorded thereon:

a main-view stream used for monoscopic video playback;
and
a sub-view stream used for stereoscopic video playback in combination with the main-view stream, wherein
the sub-view stream is encoded with reference to the main-view stream,
the main-view stream is divided into a plurality of main-view data blocks,
the sub-view stream is divided into a plurality of sub-view data blocks,
the main-view data blocks and the sub-view data blocks are successively recorded in an interleaved arrangement, and constitute a plurality of extent blocks,
each of the extent blocks is referred to during stereoscopic video playback as a single extent,
a top data block in each of the extent blocks is a sub-view data block,
the playback device comprises:
a reading unit operable to read the extent blocks from the recording medium;
a switching unit operable to extract the main-view stream and the sub-view stream from the extent blocks read by the reading unit;
a first read buffer operable to store therein the main-view stream extracted by the switching unit;
a second read buffer operable to store therein the sub-view stream extracted by the switching unit;
and
a decoding unit operable to read and decode the main-view stream from the first read buffer, and read and decode the sub-view stream from the second read buffer, and
a time (t) required for the decoding unit to decode all data blocks in one extent block is greater than or equal to a sum (t1+t2+t3) of a time (t1) required for the reading unit to read the data blocks except for a top data block in the extent block, a time (t2) required for the reading unit to start to read a top of a next extent block from a time of finishing reading a tail of the extent block, and a time (t3) required for the reading unit to read the top data block in the next extent block.

14 more elements

A recording medium playback system comprising a recording medium and a playback device for playing back the recording medium, the recording medium having recorded thereon:

a main-view stream used for monoscopic video playback;
and
a sub-view stream used for stereoscopic video playback in combination with the main-view stream, wherein
the sub-view stream is encoded with reference to the main-view stream,
the main-view stream is divided into a plurality of main-view data blocks,
the sub-view stream is divided into a plurality of sub-view data blocks,
the main-view data blocks and the sub-view data blocks are successively recorded in an interleaved arrangement, and constitute a plurality of extent blocks,
each of the extent blocks is referred to during stereoscopic video playback as a single extent,
a top data block in each of the extent blocks is a sub-view data block,
a lower limit for a size of the nth extent block SEXTSS[n] (the number n being an integer greater than or equal to 1) is represented by a right-hand side of the following expression:
S
EXTSS
⁡
[
n
]
≥
R
ud
×
R
EXTSS
⁡
[
n
]
R
ud
-
R
EXTSS
⁡
[
n
]
×
(
T
jump
⁡
[
n
]
+
T
DIFF
⁡
[
n
]
)
where the nth extent block is read at a rate Rud from the recording medium to a read buffer, the nth extent block is transferred at an average rate EEXTSS[n] from the read buffer to a decoder, a time Tjump[n] is required for a jump from the nth extent block to the (n+1)th extent block, and a difference TDIFF[n] is a result of subtracting a time required to read all data blocks in the nth extent block from a time required to read all data blocks in the (n+1)th extent block,
the playback device comprises:
a reading unit operable to read the extent blocks from the recording medium;
a switching unit operable to extract the main-view stream and the sub-view stream from the extent blocks read by the reading unit;
a first read buffer operable to store therein the main-view stream extracted by the switching unit;
a second read buffer operable to store therein the sub-view stream extracted by the switching unit;
and
a decoding unit operable to read and decode the main-view stream from the first read buffer, and read and decode the sub-view stream from the second read buffer, and
a time (t) required for the decoding unit to decode all data blocks in one extent block is greater than or equal to a sum (t1+t2+t3) of a time (t1) required for the reading unit to read the data blocks except for a top data block in the extent block, a time (t2) required for the reading unit to start to read a top of a next extent block from a time of finishing reading a tail of the extent block, and a time (t3) required for the reading unit to read the top data block in the next extent block.

57 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/749,830Filed 30 Mar 2010 · us provisional application
Priority: 31 Mar 2009
Published: US 2010/0254679 A17 Oct 2010
Granted: 25 Oct 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification23 codes

H04N 9/8227
Involving the multiplexing of an additional signal and the colour video signal: the additional signal being at least another television signal
G11B 20/00173
Involving measures which result in a restriction to authorised contents recorded on or reproduced from a record carrier, e.g. music or software:…
G11B 20/0021
Circuits for prevention of unauthorised reproduction or copying, e.g. piracy: involving encryption or decryption of contents recorded on or…
G11B 20/00362
Wherein the key is stored on the record carrier: the key being obtained from a media key block [MKB]