EP0490552A2
Expired / Lapsed
EP
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Multiplexed coded modulation with unequal error protection
Assignee: AT&T Inc
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Filing: 1991-12-02
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Granted: —
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Expires: 2011-12-02
Abstract
Abstract Unequal error protection is provided for an HDTV signal (101) by separately coding (in 120,130) each one of the classes of information (on 20,30) in the HDTV signal by using a conventional coded modulation scheme and then time-division-multiplexing (in 140) the various coded outputs for transmission.
Inventors
- 👤 Hong Yang Chung
- 👤 Jun-Der Wang
- 👤 Lee-Fang Wei
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 23:21
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/12; H04L; H04L1/00; H04L1/004; H04L1/0056; H04L1/0059; H04L1/006; H03; H03M; H03M13/00; H03M13/35; H04L1/0001; H04L1/0002; H04L1/0003; H04L1/0015; H04L1/0017; H04L1/0064; H04L1/0065; H04L1/0071; H04L27/00; H04L27/0008; H04L27/32; H04L27/34; H04L27/3405; H04L27/3416; H04L27/3422; H04L27/3427; H04N19/00; H04N19/85; H04N19/89; H04N21/00; H04N21/40; H04N21/41; H04N21/426; H04N7/015; H04N7/24; H04L2001/0098; H04N19/30
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
82 words
A method for processing an information signal, the information signal being comprised of a plurality of classes of information, the method characterized by the steps of: separately coding each one of the plurality of classes of information using a separate coded modulation scheme to provide a coded output, such that one of the plurality of classes of information has more error protection than the remaining ones of the plurality of classes of information; and multiplexing the plurality of coded outputs for transmission.
Claim 2
Dependent Claim
13 words
The method of claim 1 characterized in that the multiplexing step is time-division-multiplexing.
Claim 3
Dependent Claim
50 words
The method of claim 2 characterized in that the multiplexing step includes the step of assigning each one of the plurality of coded outputs to a time interval in a time frame, the time frame being greater than or equal to the sum of the plurality of assigned time intervals.
Claim 4
Dependent Claim
54 words
The method of claim 1 characterized in that the separately coding step includes the steps of: encoding each one of the plurality of classes of information to provide an encoded output; and mapping each one of the plurality of encoded outputs to a signal point of a signal constellation to provide the coded output.
Claim 5
Dependent Claim
36 words
The method of claim 4 characterized in that at least one of the plurality of encoded outputs is mapped to a signal constellation of different size than the remaining ones of the plurality of encoded outputs.
Claim 6
Independent Claim
177 words
A method for providing unequal error protection for an information signal, the information signal being comprised of a plurality of classes of information, the method characterized by the steps of: assigning each one of the plurality of classes of information to a coded modulation scheme such that at least one of the plurality of classes of information is assigned to a different coded modulation scheme than the remaining ones of the plurality of classes of information; assigning a time interval to each one of the plurality of coded modulation schemes such that at least one of the plurality of coded modulation schemes is assigned to a different time interval than the remaining ones of the plurality of coded modulation schemes; and separately coding each one of the plurality of classes of information using the assigned coded modulation scheme in the assigned time interval to provide a coded output for transmission such that at least one of the plurality of classes of information has more error protection than the remaining ones of the plurality of classes of information.
Claim 7
Dependent Claim
120 words
Apparatus for processing an information signal, the information signal being comprised of a plurality of classes of information, the apparatus being characterized by: source encoding means responsive to the information signal for providing the plurality of classes of information; coding means responsive to the plurality of classes of information for separately coding each one of the plurality of classes of information using a separate coded modulation scheme to provide a coded output for each one of the plurality of classes of information such that at least one of the plurality of classes of information has more error protection then the remaining ones of the plurality of classes of information; and means for multiplexing the plurality of coded outputs for transmission.
Claim 8
Dependent Claim
17 words
The apparatus of claim 7 characterized in that the means for multiplexing operates in accordance with time-division-multiplexing.
Claim 9
Dependent Claim
47 words
The apparatus of claim 7 characterized in that the means for multiplexing assigns each one of the plurality of coded outputs to a time interval in a time frame, the time frame being greater than or equal to the sum of the plurality of assigned time intervals.
Claim 10
Dependent Claim
56 words
The apparatus of claim 7 characterized in that the coding means is further comprised of: means for channel encoding each one of the plurality of classes of information to provide an encoded output; and means for mapping each one of the encoded outputs to a signal point of a signal constellation to provide the coded output.
Claim 11
Dependent Claim
35 words
The apparatus of claim 10 characterized by at least one of the plurality of encoded outputs is mapped to a signal constellation of different size than the remaining ones of the plurality of encoded outputs.
Claim 12
Dependent Claim
113 words
Apparatus for decoding a received signal, the received signal being characterized by a plurality of coded outputs, each one of the plurality of coded outputs representing a class of information and where at least one class of information is provided more error protection than the remaining ones of the plurality of classes of information, the apparatus being comprised of: means for demultiplexing the received signal to provide the plurality of coded outputs; means for decoding each one of the plurality of coded outputs using a separate decoding scheme to provide each one of the classes of information; and means for source decoding the plurality of classes of information to provide an information signal.
References Cited (Backward Citations)
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