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公开(公告)号：JP2000134196A
公开(公告)日：2000-05-12
申请号：JP31330599
申请日：1999-11-04
Applicant: GEN INSTRUMENT CORP
Inventor： ESSERMAN JAMES N , HELLER JERROLD A
IPC: H04K1/00 , G06F21/10 , H04L9/08 , H04L9/10 , H04L9/14 , H04N7/16 , H04N7/167 , H04N21/2347 , H04N21/266
Abstract: PROBLEM TO BE SOLVED: To increase the grade of terminals of the communication network in order to keep signals intact. SOLUTION: This net communication network is provided with a plurality of terminals (30, 34, 38) grouped into different security categories. Each terminal is provided with security elements (32, 36, 40), including security algorithm specific to a security category to which replaceable terminals are assigned. In the case of violation on a specific security version, a security element in a category receiving effect and replaced with a new element, having a different algorithm, can be replaced as required or periodically to keep the security of the system at a comparatively low cost.
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公开(公告)号：DK175677B1
公开(公告)日：2005-01-10
申请号：DKPA200400817
申请日：2004-05-25
Applicant: GEN INSTRUMENT CORP , TITAN CORP
Inventor： GILHOUSEN KLEIN S , HARDING MICHAEL V , HELLER JERROLD A , II ROBERT DARREL BLAKENEY
Abstract: A system in a subscriber terminal of a subscriber communication network enables descrambling of a received scrambled signal on an impulse-purchase basis. A circuit processes a received cost signal and a received credit signal to determine whether the subscriber has sufficient available credit to pay for the descrambling, and then provides a credit-available signal when it is determined that sufficient credit is available. A circuit responds to the credit-available signal for indicating that the subscriber has the option of causing the scrambled signal to be descrambled. A circuit can be enabled to accept the option and provide an accepted signal. A circuit responds to the accepted signal to descramble the signal. A separately claimed system for descrambling on a prepaid basis involves comparing a received mask signal related to the scrambled signal with a received authorisation signal. This system is compatible with the impulse-purchase descrambling system.
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公开(公告)号：AT176566T
公开(公告)日：1999-02-15
申请号：AT92112592
申请日：1992-07-23
Applicant: GEN INSTRUMENT CORP
Inventor： PAIK WOO H , LERY SCOTT A , HEEGARD CHRIS , KRAUSE EDWARD A , HELLER JERROLD A
IPC: H03M7/30 , F16D13/58 , G06T9/00 , H03M7/40 , H03M13/23 , H03M13/25 , H03M13/27 , H03M13/29 , H04L1/00 , H04L27/00 , H04L27/32 , H04L27/34 , H04N7/015 , H04N7/24 , H04N7/26 , H04N7/66 , H04N19/00 , H04N21/2383 , H04N21/438 , H04N7/00
Abstract: Coded modulation schemes based on codes for QPSK modulation are directly incorporated into QAM based modulation systems, forming trellis coded QAM, to provide a practical coding structure that is both efficient in bandwidth and data reliability. Concatenated coding with QPSK based trellis coding and symbol error correcting coding is used. In an encoder (Fig. 2), an N-bit QAM constellation pattern (80) is divided into four subsets, each including N/4 symbol points of the constellation pattern. A two-bit QPSK codeword (92) is assigned to each of the four subsets (82, 84, 86, 88). A symbol to be transmitted is first encoded using an outer error correcting encoding algorithm, such as a Reed-Solomon code (12). Part of the symbol is then encoded (48) with an inner code that comprises a rate 1/2 trellis encoding algorithm to provide a QPSK codeword, which is mapped (50) with the remaining bits of the symbol to provide a modulation function, wherein the remaining bits (94) correlate the symbol with one of the symbol points included in the subset defined by the QPSK codeword. At a receiver (Fig. 3), the recovered modulation function is pruned (62) to provide a set of metrics (66) corresponding to the subsets and to provide a plurality of conditional determinations of the constellation point identified by the remaining bits. The metrics are used in a rate 1/2 trellis decoder (68) to recover a first bit that is encoded using a rate 1/2 encoding algorithm to recreate the QPSK codeword. One of a plurality of the conditional determinations is selected in response to the recreated codeword. The selected conditional determination is combined with the recovered first bit to provide a decoded output that is further decoded using a symbol error correcting algorithm such as a Reed-Solomon code (36).
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公开(公告)号：DK0485887T3
公开(公告)日：1998-03-02
申请号：DK91118977
申请日：1991-11-07
Applicant: GEN INSTRUMENT CORP
Inventor： ESSERMAN JAMES NEIL , HELLER JERROLD A
IPC: H04K1/00 , G06F21/10 , H04L9/08 , H04L9/10 , H04L9/14 , H04N7/16 , H04N7/167 , H04N21/2347 , H04N21/266
Abstract: A secure communication network serves a plurality of terminals (30, 34, 38) grouped into different security categories. Each terminal includes a replaceable security element (32, 36, 40) containing a security algorithm specific to the security category to which the terminal is assigned. Upon the breach of a particular security version, the security elements in the affected category are replaced with new elements containing a different algorithm. The security elements are relatively low cost, and can be replaced on an as needed or periodic basis to maintain system security.
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公开(公告)号：DE69127171T2
公开(公告)日：1998-01-29
申请号：DE69127171
申请日：1991-11-07
Applicant: GEN INSTRUMENT CORP
Inventor： ESSERMAN JAMES NEIL , HELLER JERROLD A
IPC: H04K1/00 , G06F21/10 , H04L9/08 , H04L9/10 , H04L9/14 , H04N7/16 , H04N7/167 , H04N21/2347 , H04N21/266
Abstract: A secure communication network serves a plurality of terminals (30, 34, 38) grouped into different security categories. Each terminal includes a replaceable security element (32, 36, 40) containing a security algorithm specific to the security category to which the terminal is assigned. Upon the breach of a particular security version, the security elements in the affected category are replaced with new elements containing a different algorithm. The security elements are relatively low cost, and can be replaced on an as needed or periodic basis to maintain system security.
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Patent Agency Ranking
公开(公告)号：AT156645T
公开(公告)日：1997-08-15
申请号：AT91118977
申请日：1991-11-07
Applicant: GEN INSTRUMENT CORP
Inventor： ESSERMAN JAMES NEIL , HELLER JERROLD A
IPC: H04K1/00 , G06F21/10 , H04L9/08 , H04L9/10 , H04L9/14 , H04N7/16 , H04N7/167 , H04N21/2347 , H04N21/266
Abstract: A secure communication network serves a plurality of terminals (30, 34, 38) grouped into different security categories. Each terminal includes a replaceable security element (32, 36, 40) containing a security algorithm specific to the security category to which the terminal is assigned. Upon the breach of a particular security version, the security elements in the affected category are replaced with new elements containing a different algorithm. The security elements are relatively low cost, and can be replaced on an as needed or periodic basis to maintain system security.
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公开(公告)号：NO922927D0
公开(公告)日：1992-07-23
申请号：NO922927
申请日：1992-07-23
Applicant: GEN INSTRUMENT CORP
Inventor： PAIK WOO H , LERY SCOTT A , HEEGARD CHRIS , KRAUSE EDWARD A , HELLER JERROLD A
IPC: H03M7/30 , F16D13/58 , G06T9/00 , H03M7/40 , H03M13/23 , H03M13/25 , H03M13/27 , H03M13/29 , H04L1/00 , H04L27/00 , H04L27/32 , H04L27/34 , H04N7/015 , H04N7/24 , H04N7/26 , H04N7/66 , H04N19/00 , H04N21/2383 , H04N21/438 , H04L
Abstract: Coded modulation schemes based on codes for QPSK modulation are directly incorporated into QAM based modulation systems, forming trellis coded QAM, to provide a practical coding structure that is both efficient in bandwidth and data reliability. Concatenated coding with QPSK based trellis coding and symbol error correcting coding is used. In an encoder (Fig. 2), an N-bit QAM constellation pattern (80) is divided into four subsets, each including N/4 symbol points of the constellation pattern. A two-bit QPSK codeword (92) is assigned to each of the four subsets (82, 84, 86, 88). A symbol to be transmitted is first encoded using an outer error correcting encoding algorithm, such as a Reed-Solomon code (12). Part of the symbol is then encoded (48) with an inner code that comprises a rate 1/2 trellis encoding algorithm to provide a QPSK codeword, which is mapped (50) with the remaining bits of the symbol to provide a modulation function, wherein the remaining bits (94) correlate the symbol with one of the symbol points included in the subset defined by the QPSK codeword. At a receiver (Fig. 3), the recovered modulation function is pruned (62) to provide a set of metrics (66) corresponding to the subsets and to provide a plurality of conditional determinations of the constellation point identified by the remaining bits. The metrics are used in a rate 1/2 trellis decoder (68) to recover a first bit that is encoded using a rate 1/2 encoding algorithm to recreate the QPSK codeword. One of a plurality of the conditional determinations is selected in response to the recreated codeword. The selected conditional determination is combined with the recovered first bit to provide a decoded output that is further decoded using a symbol error correcting algorithm such as a Reed-Solomon code (36).
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公开(公告)号：AU8788891A
公开(公告)日：1992-05-21
申请号：AU8788891
申请日：1991-11-14
Applicant: GEN INSTRUMENT CORP
Inventor： KRAUSE EDWARD , PAIK WOO H , LIU VINCENT C , HELLER JERROLD A , SHEN PAUL , ESSERMAN JAMES NEIL
Abstract: An image area is refreshed during the transmission of a set of motion compensated sequential video images. The video images are divided into a plurality of adjacent regions. The image area is refreshed during a refresh cycle by communicating a different region in each successive video image of the set without motion compensation. Motion compensation of the previously refreshed regions of the image area during the refresh cycle is restricted to an area containing only the previously refreshed regions. Video image data from a current region being refreshed is encoded for use by a decoder in identifying it as non-motion compensated data.
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公开(公告)号：NO914318L
公开(公告)日：1992-05-18
申请号：NO914318
申请日：1991-11-04
Applicant: GEN INSTRUMENT CORP
Inventor： KRAUSE EDWARD , PAIK WOO H , LIU VINCENT C , HELLER JERROLD A , SHEN PAUL , ESSERMAN JAMES NEIL
Abstract: An image area is refreshed during the transmission of a set of motion compensated sequential video images. The video images are divided into a plurality of adjacent regions. The image area is refreshed during a refresh cycle by communicating a different region in each successive video image of the set without motion compensation. Motion compensation of the previously refreshed regions of the image area during the refresh cycle is restricted to an area containing only the previously refreshed regions. Video image data from a current region being refreshed is encoded for use by a decoder in identifying it as non-motion compensated data.
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公开(公告)号：CA2055132A1
公开(公告)日：1992-05-17
申请号：CA2055132
申请日：1991-11-07
Applicant: GEN INSTRUMENT CORP
Inventor： ESSERMAN JAMES N , HELLER JERROLD A
IPC: H04K1/00 , G06F21/10 , H04L9/08 , H04L9/10 , H04L9/14 , H04N7/16 , H04N7/167 , H04N21/2347 , H04N21/266
Abstract: A secure communication network serves a plurality of terminals (30, 34, 38) grouped into different security categories. Each terminal includes a replaceable security element (32, 36, 40) containing a security algorithm specific to the security category to which the terminal is assigned. Upon the breach of a particular security version, the security elements in the affected category are replaced with new elements containing a different algorithm. The security elements are relatively low cost, and can be replaced on an as needed or periodic basis to maintain system security.
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