Patent EP0948141A2 successfully refreshed from Google Patents.
EP0948141A2
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Decoding device for multichannel audio bitstream
Assignee: Panasonic Holdings Corp
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Filing: 1999-03-26
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Granted: —
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Expires: 2019-03-26
Abstract
Abstract A decoding device for decoding a bit stream defined by MPEG2 Audio Multichannel is provided. The bit stream including an MPEG1 compatible area and an MPEG2 multichannel extended area, the MPEG1 compatible area including MPEG1 side information. The decoding device includes: MPEG1 decoding means for decoding the MPEG1 compatible area; MC decoding means for decoding the MPEG2 multichannel extended area; and MC header detection means for executing a first processing including locating a position of a header of the MPEG2 multichannel extended area based on the MPEG1 side information and shifting a read position of the bit stream to the position of the header. <IMAGE>
Inventors
- 👤 Masahiro Sueyoshi
- 👤 Masaharu Matsumoto
- 👤 Shuji Miyasaka
- 👤 Takeshi Fujita
- 👤 Takashi Katayama
- 👤 Kazutaka Abe
- 👤 Kosuke Nishio
- 👤 Akihisa Kawamura
- 👤 Tsukuru Ishito
- 👤 Tsuyoshi Nakamura
- 👤 Eiji Otomura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 22:54
CPC Classifications
H; H04; H04N; H04N21/00; H04N21/40; H04N21/43; H04N21/434; H04N21/4341; G; G10; G10L; G10L19/00; H04N21/80; H04N21/81; H04N21/8106; H04N7/00; H04N7/24; H04N7/52
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
102 words
A decoding device for decoding a bit stream defined by
MPEG2 Audio Multichannel, the bit stream including an MPEG1 compatible area
and an MPEG2 multichannel extended area, the MPEG1 compatible area including MPEG1 side
information, the decoding device comprising: MPEG1 decoding means for decoding the MPEG1
compatible area; MC decoding means for decoding the MPEG2
multichannel extended area; and MC header detection means for executing a first
processing including locating a position of a header of the
MPEG2 multichannel extended area based on the MPEG1 side
information and shifting a read position of the bit stream
to the position of the header.
Claim 2
Dependent Claim
53 words
A decoding device according to claim 1, wherein the MC
header detection means executes the first processing on the
way to the decoding of the MPEG1 compatible area by the MPEG1
decoding means, and the MC decoding means executes a predetermined
second processing after the MC header detection means
executes the first processing.
Claim 3
Dependent Claim
52 words
A decoding device according to claim 2, wherein, after
the execution of the predetermined second processing by the
MC decoding means, the decoding device alternately executes
the decoding of the MPEG1 compatible area by the MPEG1
decoding means and the decoding of the MPEG2 multichannel
extended area by the MC decoding means.
Claim 4
Dependent Claim
52 words
A decoding device according to claim 1, wherein the bit
stream includes a bit stream defined by MPEG2 Audio
Multichannel, Layer I, the MPEG1 side information includes allocation
information, and the MC header detection means locates the position
of the header of the MPEG2 multichannel extended area based
on the allocation information.
Claim 5
Dependent Claim
63 words
A decoding device according to claim 1, wherein the bit
stream includes a bit stream defined by MPEG2 Audio
Multichannel, Layer II, the MPEG1 side information includes allocation
information and scale factor selection information, and the MC header detection means locates the position
of the header of the MPEG2 multichannel extended area based
on the allocation information and the scale factor selection
information.
Claim 6
Dependent Claim
32 words
A decoding device according to claim 2, wherein the
predetermined second processing includes a processing of
reading MC side information from the position and executing
error check for the MC side information.
Claim 7
Dependent Claim
15 words
A decoding device according to claim 6, wherein the error
check includes at least CRC.
Claim 8
Dependent Claim
231 words
A decoding device for decoding a first bit stream defined
by MPEG1 and a second bit stream defined by MPEG2 Audio
Multichannel, the first bit stream including an MPEG1 compatible
area, the second bit stream including the MPEG1 compatible
area and an MPEG2 multichannel extended area, the MPEG1 compatible area including MPEG1 side
information, the decoding device comprising: MPEG1 decoding means for decoding the MPEG1
compatible area; MC decoding means for decoding the MPEG2
multichannel extended area; and MC header detection means for executing a first
processing including locating a position of a header of the
MPEG2 multichannel extended area based on the MPEG1 side
information and shifting a read position of the bit stream
to the position of the header, wherein the MC header detection means executes the
first processing on the way to a processing of the MPEG1
decoding means, the MC decoding means reads information from the
position after the MC header detection means executes the
first processing, and executes CRC for the information, when results of the CRC are normal, the decoding
device alternately executes the decoding of the MPEG1
compatible area by the MPEG1 decoding means and the decoding
of the MPEG2 multichannel extended area by the MC decoding
means, and when the results of the CRC are abnormal, the
decoding device executes only the decoding of the MPEG1
compatible area by the MPEG1 decoding means.
Claim 9
Dependent Claim
214 words
A decoding device for decoding a first bit stream defined
by MPEG1 and a second bit stream defined by MPEG2 Audio
Multichannel, the first bit stream including an MPEG1 compatible
area, the second bit stream including the MPEG1 compatible
area and an MPEG2 multichannel extended area, the MPEG1 compatible area including MPEG1 side
information, the decoding device comprising: MPEG1 decoding means for decoding the MPEG1
compatible area; MC decoding means for decoding the MPEG2
multichannel extended area; and MC header detection means for executing a first
processing including locating a position of a header of the
MPEG2 multichannel extended area based on the MPEG1 side
information and shifting a read position of the bit stream
to the position of the header, wherein the MC header detection means executes the
first processing on the way to a processing of the MPEG1
decoding means, the MC decoding means determines whether or not the
number of channels in the MPEG2 multichannel extended area
is zero based on information read from a position where MC
side information for the MPEG2 multichannel extended area
is stored, and if the number of channels in the MPEG2 multichannel
extended area is zero, the decoding of the MPEG2 multichannel
extended area is not performed, but only the MPEG1 compatible
area is decoded.
Claim 10
Dependent Claim
73 words
A decoding device according to claim 9, wherein the MC
decoding means reads information from the position after
the MC header detection means executes the first processing,
and executes CRC for the information, and if the number of channels in the MPEG2 multichannel
extended area is zero, the decoding device does not decode
the MPEG2 multichannel extended area but decodes only the
MPEG1 compatible area, even when results of the CRC are
normal.
Claim 11
Dependent Claim
121 words
A decoding device for decoding a first bit stream defined
by MPEG1 and a second bit stream defined by MPEG2 Audio
Multichannel, the first bit stream including an MPEG1 compatible
area, the second bit stream including the MPEG1 compatible
area and an MPEG2 multichannel extended area, the MPEG1 compatible area including MPEG1 side
information, the decoding device comprising: MPEG1 decoding means for decoding the MPEG1
compatible area; and MC decoding means for decoding the MPEG2
multichannel extended area, wherein the decoding device terminates the decoding
if a length of the bit stream consumed in the decoding of
the MPEG2 multichannel extended area by the MC decoding means
exceeds a stream length of one frame, and decodes only the
MPEG1 compatible area.
Claim 12
Dependent Claim
56 words
A decoding device according to claim 11, wherein the
stream length of one frame comprises a sum of an MPEG1 base
frame length and an extension stream length when an extension
stream defined by MPEG2 Audio Multichannel is included in
the bit stream, and comprises the MPEG1 base frame length
when no extension stream is included.
Claim 13
Dependent Claim
67 words
A decoding device according to claim 11, wherein the
stream length of one frame comprises a value obtained by
subtracting n_ad_bytes defined by MPEG2 Multichannel from
a sum of an MPEG1 base frame length and an extension stream
length when an extension stream defined by MPEG2 Audio
Multichannel is included in the bit stream, and comprises
the MPEG1 base frame length when no extension stream is
included.
References Cited (Backward Citations)
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