US6526099B1
Expired / Lapsed
US
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Transcoder
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1999-04-20
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Granted: 2003-02-25
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Expires: 2019-04-20
Abstract
Abstract In a transcoder means are provided for implementing a simultaneous change in rate and in resolution. In a preferred embodiment means are also provided for transferring incoming motion vectors or the like directly to the output encoder. The transcoder architecture is both suited for implementation in the spatial as well as in the frequency domain.
Inventors
- 👤 Charilaos Christopoulos
- 👤 Niklas Björk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:29
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/90; H04N19/40; H04N19/48
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
61 words
A transcoder comprising: means for decoding an incoming video signal coded according to a first coding scheme and means for encoding an outgoing video signal according to a second coding scheme, means for coding the outgoing video signal with a changed resolution (spatial and/or temporal), and means for performing the resolution change for the outgoing video signal in the frequency domain.
Claim 2
Dependent Claim
61 words
A transcoder comprising: means for decoding an incoming video signal coded according to a first coding scheme and means for encoding an outgoing video signal according to a second coding scheme, means for coding the outgoing video signal with a changed resolution (spatial and/or temporal), and means for performing the resolution change for the outgoing video signal in the frequency domain.
Claim 3
Dependent Claim
58 words
A transcoder according to claim 1 , in the case when the incoming and outgoing video signals are coded with coding schemes employing motion compensation, characterised in that the transcoder has means for extracting the motion compensation parameters from the incoming video signal and for transferring the motion compensation information to the encoder outputting the outgoing video signal.
Claim 4
Dependent Claim
24 words
A transcoder according to claim 2 , characterised by means for performing refinement of the motion vectors provided from the decoder of the transcoder.
Claim 5
Dependent Claim
29 words
A transcoder according to any of claim 1 , characterised by means in the encoder of the transcoder for performing pruning DCT algorithms in order to achieve fast transcoding.
Claim 6
Dependent Claim
31 words
A transcoder according to any of claim 1 , characterised by means in the transcoder for performing interpolation in the DCT domain with zero padding or according to a zooming algorithm.
Claim 7
Dependent Claim
28 words
A transcoder according to any of claim 1 , characterised by quantization means in the encoder of the transcoder means in order to output a required compression ratio.
Claim 8
Dependent Claim
29 words
A transcoder according to any of claim 1 , characterised by variable length encoding means in the encoder of the transcoder adapted for the block size and resolution used.
Claim 9
Dependent Claim
23 words
A transcoder according to any of claim 1 , characterised by means for performing a change in spatial resolution between successive transmitted frames.
Claim 10
Dependent Claim
25 words
A transcoder according to claim 8 , characterised by means for changing the spatial resolution in accordance with the bandwidth available at the receiver site.
Claim 11
Dependent Claim
26 words
A transcoder according to claim 1 , characterised by means for transcoding the outgoing DCT transformed video signal into another resolution without using any DCT/IDCT processors.
Claim 12
Independent Claim
50 words
A method comprising: transcoding an incoming video signal coded according to a first coding scheme into an outgoing video signal according to a second coding scheme wherein the outgoing video signal is encoded with a changed resolution (spatial and/or temporal), wherein the resolution change is performed in the frequency domain.
Claim 13
Independent Claim
50 words
A method comprising: transcoding an incoming video signal coded according to a first coding scheme into an outgoing video signal according to a second coding scheme wherein the outgoing video signal is encoded with a changed resolution (spatial and/or temporal), wherein the resolution change is performed in the frequency domain.
Claim 14
Dependent Claim
54 words
A method according to claim 11 , in the case when the incoming and outgoing video signals are coded with coding schemes employing motion compensation, characterised in that motion compensation information is extracted from the incoming video signal and that the motion compensation information is transferred to the encoder outputting the outgoing video signal.
Claim 15
Dependent Claim
41 words
A transcoder according to claim 12 , characterised in that the motion vectors provided from the decoder of the transcoder are refined in the case when the accuracy required from the output sequence is different than that of the input sequence.
Claim 16
Dependent Claim
21 words
A method according to any of claim 11 , characterised in that the resolution change is performed in the spatial domain.
Claim 17
Dependent Claim
31 words
A method according to any of claim 11 , in the case when DCT algorithms are employed, characterised in that pruning DCT algorithms are used in order to achieve fast transcoding.
Claim 18
Dependent Claim
35 words
A method according to any of claim 11 , characterised in that the interpolation is performed using zero padding or according to the zooming algorithm when the output has a higher resolution than the input.
Claim 19
Dependent Claim
25 words
A method according to any of claim 11 , characterised in that the a required compression ratio is obtained by selecting a suitable quantasiation factor.
Claim 20
Dependent Claim
44 words
A method according to any of claim 11 , characterised in that output sequence from the transcoder is adapted according to the block size and resolution used, by means of applying a variable length encoder suitable for the particular block size and resolution used.
Claim 21
Dependent Claim
29 words
A method according to any of claim 11 , characterised in that a change in resolution between successive transmitted frames is performed in accordance with the present transmission conditions.
Claim 22
Dependent Claim
26 words
A method according to claim 19 , characterised in that the resolution is changed in accordance with the bandwidth and/or requirements available at the receiver site.
Claim 23
Dependent Claim
37 words
A method according to claim 11 , when the incoming video signal is a DCT transformed video signal, characterised in that the outgoing DCT transformed video signal is transcoded into another resolution without using any DCT/IDCT processors.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-02-24 | 2006-08-26 | 2007-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-02-24 | 2010-08-26 | 2011-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-02-24 | 2014-08-26 | 2015-02-25 | $7700.00 | Window Closed / Lapsed |