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EP0634840A1
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EP
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Unequal error protection for combined information signals
Assignee: AT&T Inc
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Filing: 1994-07-06
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Granted: —
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Expires: 2014-07-06
Abstract
Abstract A method of tailored error protection coding is disclosed. An illustrative coding method according to the present invention concerns encoding a first signal and a second signal to provide error protection for the signals, wherein the first signal requires greater error protection than the second signal. According to the method, the first signal is encoded with a first error protection code. The encoded first signal is then combined with the second signal. The combination of the encoded first signal and the second signal is further encoded with a second error protection code to generate a combined error protected signal, wherein the first signal is coded with both the first and second error protection codes. A second embodiment concerns the use of separate coders which apply different error protection codes to two signals. The two encoded signals are then combined into a single signal.
Inventors
- 👤 Sean M. Dorward
- 👤 Nuggehally Sampath Jayant
- 👤 James David Johnston
- 👤 Schuyler R. Quackenbush
- 👤 Nambirajan Seshadri
- 👤 Carl-Erik Wilhelm Sundberg
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 02:05
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/004; H04L1/0056; H04L1/0057; H03; H03M; H03M13/00; H03M13/03; H03M13/05; H03M13/13; H03M13/15; H03M13/151; H03M13/1515; H03M13/27; H03M13/29; H03M13/2903; H03M13/35; H03M13/65; H03M13/6508; H03M13/6513; H04L1/0064; H04L1/0065; H04L1/007; H04L1/0071
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
98 words
A method for encoding a first signal and a second signal to provide error protection for the signals, the first signal requiring greater error protection than the second signal, the method comprising the steps of: a. encoding the first signal with a first error protection code; b. combining the encoded first signal with the second signal; and c. encoding a combination of the encoded first signal and the second signal with a second error protection code to generate a combined error protected signal, wherein the first signal is coded with both the first and second error protection codes.
Claim 2
Independent Claim
153 words
A method for decoding a received signal comprising a coded first signal and a coded second signal, wherein the coded first signal is coded with a first and a second error protection code and wherein the coded second signal is coded with the second error protection code, the first signal requiring greater error protection than the second signal, the method comprising the steps of: a. decoding the received signal with a first error protection decoder which corresponds to the first error protection code to generate a signal comprising a decoded second signal and a partially decoded first signal; b. separating the partially decoded first signal from the decoded second signal; and c. decoding the partially decoded first signal with a second error protection decoder which corresponds to the second error protection code to generate a decoded first signal, wherein the first signal is decoded with both the first and second error protection decoders.
Claim 3
Independent Claim
92 words
A method for encoding a first signal and a second signal to provide error protection for the signals, the first signal requiring greater error protection than the second signal, the method comprising the steps of: a. encoding the first signal with a first error protection code; and b. encoding the second signal with a second error protection code, wherein the second error protection code is a less powerful error protection code than the first error protection code; c. combining the encoded first and second signals to generate a combined error protected signal.
Claim 4
Independent Claim
129 words
A method for decoding a received signal comprising a coded first signal and a coded second signal, the first coded signal coded with a first error protection code and the second coded signal coded with a second error protection code, wherein the second error protection code is a less powerful error protection code than the first error protection code, the method comprising the steps of: a. separating the coded first signal from the coded second signal; b. decoding the coded first signal with a first error protection decoder which corresponds to the first error protection code to generate a decoded first signal; and c. decoding the coded second signal with a second error protection decoder which corresponds to the second error protection code to generate a decoded second signal.
Claim 5
Independent Claim
115 words
A method of encoding a first signal and a second signal to provide error protection for the signals, the first signal requiring greater error protection than the second signal, the method comprising the steps of: a. combining the first and second signals to generate a combined signal comprising identifiable first and second signal segments. b. encoding a first signal segment with a first error protection code, the first error protection code applied to the first signal by a coder; and c. encoding a second signal segment with a second error protection code applied by the coder, wherein the second error protection code is a less powerful error protection code than the first error protection code.
Claim 6
Independent Claim
111 words
A method of decoding a received signal comprising identifyable coded first and second signal segments, a first coded signal segment coded with a first error protection code and a second coded signal segment coded with a second error protection code, wherein the second error protection code is a less powerful error protection code than the first error protection code, the method comprising the steps of: a. decoding a first signal segment with a decoder, wherein the decoding reflects the first error protection code; b. decoding a second signal segment with the decoder, wherein the decoding reflects the second error protection code; and c. separating the decoded first and second signal segments.
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