US5629958A
Expired / Lapsed
US
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Data frame structure and synchronization system for digital television signal
Assignee: Zenith Electronics LLC
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Filing: 1994-07-08
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Granted: 1997-05-13
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Expires: 2014-07-08
Abstract
Abstract A television signal is formatted for transmission by arranging a plurality of encoded data symbols, representing a plurality of source data bytes, into successive data frames each comprising 313 data segments. One of the data segments of each frame comprises a frame sync segment of which the last 12 symbols comprise a copy of the last 12 encoded data symbols of the preceding data segment. The remaining segments of each frame comprise 12 interleaved subsegments A-L, each subsegment comprising a plurality of encoded data symbols representing a contiguous group of sources data bytes, with the first symbol of each of the first 4 subsegments A-D comprising a predetermined segment sync symbol. The received signal is decoded by independently processing the symbols of each respective subsegment to derive estimations of the source data bytes.
Inventors
- 👤 David A. Willming
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:13
CPC Classifications
H; H04; H04N; H04N21/00; H04N21/20; H04N21/23; H04N21/236; H04L; H04L1/00; H04L1/004; H04L1/0056; H04L1/0071; H04L1/0045; H04L1/0054; H04L27/00; H04L27/02; H04L27/32; H04L27/34; H04L27/3405; H04L27/3416; H04L27/3427; H04L27/3433; H04N19/00; H04N19/85; H04N19/89; H04N21/40; H04N21/41; H04N21/426; H04N21/43; H04N21/434
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
74 words
A method of structuring a data frame comprising: arranging a plurality of encoded data symbols representing a plurality of source data bytes into a predetermined number of data segments comprising a data frame, a predetermined one of said data segments comprising a frame sync segment; and copying the last N encoded data symbols of the data segment immediately preceding said frame sync segment into the last N symbol positions of said frame sync segment.
Claim 2
Independent Claim
74 words
A method of structuring a data frame comprising: arranging a plurality of encoded data symbols representing a plurality of source data bytes into a predetermined number of data segments comprising a data frame, a predetermined one of said data segments comprising a frame sync segment; and copying the last N encoded data symbols of the data segment immediately preceding said frame sync segment into the last N symbol positions of said frame sync segment.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein N is equal to 12.
Claim 4
Dependent Claim
51 words
The method of claim 1 including writing said last N encoded data symbols of the data segment immediately preceding said frame sync segment for storage in a memory and reading said stored N encoded symbols from said memory for insertion into the last N symbol positions of said frame sync segment.
Claim 5
Dependent Claim
14 words
The method of claim 1 wherein said predetermined number of data segments comprises 313.
Claim 6
Dependent Claim
19 words
The method of claim 1 wherein each of said encoded data symbols represents at least 2 bits of data.
Claim 7
Dependent Claim
94 words
The method of claim 1 wherein each of said data segments other than said frame sync segment comprises N interleaved subsegments each comprising a plurality of said encoded data symbols representing a contiguous group of said source data bytes, the first symbol of each of the first M subsegments comprising a predetermined data segment sync symbol, where M is less than N and equal to or greater than 4, and wherein the first encoded data symbol of each of the remaining subsegments is properly interleaved with the encoded data symbols of the respective subsegment.
Claim 8
Dependent Claim
17 words
The method of claim 6 wherein N is equal to 12 and M is equal to 4.
Claim 9
Dependent Claim
69 words
The method of claim 7 including supplying a plurality of data symbols at a fixed symbol rate, encoding said plurality of data symbols to derive said encoded data symbols, said encoding step including applying said data symbols to a delay element 12 symbol intervals in length, and feeding back the output of said delay element to its input during the symbol intervals corresponding to said data segment sync symbols.
Claim 10
Dependent Claim
134 words
A receiver comprising: means for receiving a data signal comprising a plurality of successive data frames, each of said data frames comprising a plurality of encoded data symbols representing a plurality of source data bytes and arranged in a predetermined number of data segments in which the data symbols are .grouped in a plurality of respective interleaved subsegments, a predetermined one of the data segments of each of said data frames comprising a frame sync segment the last N symbols of which comprise a copy of the last N encoded data symbols of the immediately preceding data segment; and decoding means responsive to said received data signal for combining symbols from each of said subsegments with symbols from the same subsegment for deriving a plurality of estimated data bytes representing said source data bytes.
Claim 11
Dependent Claim
134 words
A receiver comprising: means for receiving a data signal comprising a plurality of successive data frames, each of said data frames comprising a plurality of encoded data symbols representing a plurality of source data bytes and arranged in a predetermined number of data segments in which the data symbols are .grouped in a plurality of respective interleaved subsegments, a predetermined one of the data segments of each of said data frames comprising a frame sync segment the last N symbols of which comprise a copy of the last N encoded data symbols of the immediately preceding data segment; and decoding means responsive to said received data signal for combining symbols from each of said subsegments with symbols from the same subsegment for deriving a plurality of estimated data bytes representing said source data bytes.
Claim 12
Dependent Claim
13 words
The receiver of claim 9 wherein said predetermined number is equal to 313.
Claim 13
Dependent Claim
11 words
The receiver of claim 9 wherein N is equal to 12.
Claim 14
Dependent Claim
73 words
The receiver of claim 9 wherein each of said data segments other than said frame sync segment comprises N interleaved subsegments each comprising a plurality of said encoded data symbols representing a contiguous group of said source data bytes and wherein said decoding means comprises means for independently decoding each of said subsegments for deriving a plurality of estimated data bytes representing the corresponding one of said groups of contiguous source data bytes.
Claim 15
Dependent Claim
64 words
The receiver of claim 12 wherein the first symbol of each of the first M subsegments of each data segment comprises a predetermined data segment sync symbol, where M is less than N and equal to or greater than 4, and the first encoded data symbol of each of the remaining subsegments is properly interleaved with the encoded data symbols of the respective subsegment.
Claim 16
Dependent Claim
17 words
The receiver of claim 13 wherein N is equal to 12 and M is equal to 4.
Claim 17
Dependent Claim
48 words
The receiver of claim 14 wherein said decoding means comprises a delay element 12 symbol intervals in length coupled to said receiving means and means for feeding back the output of said delay element to its input during the symbol intervals corresponding to said data segment sync symbols.
Claim 18
Dependent Claim
95 words
The receiver of claim 14 including a linear filter responsive to said received data signal for reducing co-channel interference, said filter comprising means for subtracting each received encoded data symbol from the encoded data symbol received 12 symbol intervals prior thereto, means for adding each filtered encoded symbol to the filtered encoded symbol generated 12 symbol intervals prior thereto and means supplying the output of said adding means to said decoding means during symbol intervals 13-16 of each of said data segments and otherwise supplying the output of said subtracting means to said decoding means.
References Cited (Backward Citations)
EP0422443A2
Cited
US5087975A
Cited
US5222077A
Cited
US5260793A
Cited
US5321725A
Cited
US5341401A
Cited
US5311554A
Cited
US5442646A
Cited
USPTO Annuity & Maintenance Windows
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| 7.5 Years (Year 8) | 2004-05-12 | 2004-11-11 | 2005-05-13 | $3760.00 | Window Closed / Lapsed |
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