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公开(公告)号：JP2000032454A
公开(公告)日：2000-01-28
申请号：JP17847799
申请日：1999-06-24
Applicant: GEN INSTRUMENT CORP
Inventor： PAIK WOO H , KRAUSE EDWARD A , LIU VINCENT , SHEN PAUL , DEROVANESSIAN HENRY
IPC: H04N1/41 , G06T9/00 , H04N7/08 , H04N7/081 , H04N7/58 , H04N19/00 , H04N21/2365 , H04N21/434 , H04N7/24
Abstract: PROBLEM TO BE SOLVED: To provide a multiplex channel image compression system that compresses image data by using plural coders. SOLUTION: A coding level command is given to respective coders for designating quality level. Coded image data generated by the coders, in response to the coding level command, are multiplexed for transmission by a multiplexer 26 and become decoded signals. The coding level command is used to adjust the quality level so as to maintain stored data within the range of a processing capability of a communication channel 48, in response to the storage amount of data consisting of the decoded signal. The coding level command can designates an identical general-purpose coding level to all the coders, but each coder derives a local coding level from the general-purpose coding level and is able to provide different coding qualities. Decoders 30-46 are installed to decode the image from compressed image data.
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公开(公告)号：NO309069B1
公开(公告)日：2000-12-04
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
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：HK1013759A1
公开(公告)日：1999-09-03
申请号：HK98115013
申请日：1998-12-23
Applicant: GEN INSTRUMENT CORP
Inventor： KRAUSE EDWARD A , PAIK WOO H , LIU VINCENT , ESSERMAN JIM
Abstract: A method and apparatus are provided for processing digital video signals for transmission in a compressed form. A set of pixel data is compressed without motion compensation to provide a first compressed video signal. The pixel data is compressed using motion compensation to provide a second compressed video signal. The data in the first and second compressed video signals is quantified. A comparison is made to determine which of the signals contains the least data. Successive sets of pixel data are sequentially compressed and quantified and the compressed video signal having the least data for each particular set is selected. The selected signals are encoded to identify them as motion compensated or non-motion compensated signals, and combined to provide a compressed video signal data stream for transmission. Apparatus for receiving and decoding the signals is also disclosed.
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公开(公告)号：AT182243T
公开(公告)日：1999-07-15
申请号：AT91108087
申请日：1991-05-18
Applicant: GEN INSTRUMENT CORP
Inventor： KRAUSE EDWARD A , PAIK WOO H , LIU VINCENT , ESSERMAN JIM
Abstract: A method and apparatus are provided for processing digital video signals for transmission in a compressed form. A set of pixel data is compressed without motion compensation to provide a first compressed video signal. The pixel data is compressed using motion compensation to provide a second compressed video signal. The data in the first and second compressed video signals is quantified. A comparison is made to determine which of the signals contains the least data. Successive sets of pixel data are sequentially compressed and quantified and the compressed video signal having the least data for each particular set is selected. The selected signals are encoded to identify them as motion compensated or non-motion compensated signals, and combined to provide a compressed video signal data stream for transmission. Apparatus for receiving and decoding the signals is also disclosed.
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公开(公告)号：DE69227821T2
公开(公告)日：1999-06-17
申请号：DE69227821
申请日：1992-10-31
Applicant: GEN INSTRUMENT CORP
Inventor： SHEN PAUL , PAIK WOO H , KRAUSE EDWARD A
IPC: H03M7/00 , G06T1/60 , G11C7/10 , H04N5/907 , H04N7/26 , H04N7/32 , H04N7/36 , H04N7/50 , G11C7/00
Abstract: A multiple serial access memory is provided. A dynamic random access memory (30) is addressed to input data thereto and output data therefrom. Rows of data are output from the array (50) in response to address signals (34, 36, 38) provided thereto. A plurality of serial output ports (44, 46, 48) is coupled to the output of the array for selectively latching different rows of data output from the array. The serial output ports (44, 46, 48) are clocked to output the latched data therefrom. In an illustrated embodiment, each of the serial output ports contains a shift register (62, 64, 66, ... 68) having a length equal to the width of the memory array (30). The shift register is responsive to a first timing signal (42, 52) for latching a row of data from the array (30). A second timing signal actuates the shift register to shift a row of latched data. A serial access selector (70) coupled to the shift register outputs a selected portion of the shifted data from the serial output port. The memory has particular application as the frame store for a motion compensated interframe image coding/decoding system.
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Patent Agency Ranking
公开(公告)号：DE69228715D1
公开(公告)日：1999-04-29
申请号：DE69228715
申请日：1992-01-29
Applicant: GEN INSTRUMENT CORP
Inventor： SHEN PAUL , KRAUSE EDWARD A , PAIK WOO H
IPC: H03M7/30 , G06T9/00 , H04N7/60 , H04N11/04 , H04N19/00 , H04N21/236 , H04N21/434 , H04N7/26 , H04N7/46 , H04N7/50
Abstract: Digital video signals are processed by a plurality of independently operating processors (42, 44, 46, 48) to provide data for transmission in a compressed, motion compensated form. A video image frame area (10) is divided into a set of subframes (12, 16, 20, 24). The set of subframes is systematically shifted such that the individual subframes progressively cycle across and wrap around the video image frame area. For each successive video frame, video image data bounded by each of the different subframes is independently compressed using motion estimation to reduce data redundancy among the successive frames. The motion estimation is limited for each subframe of a current video frame to areas of a previous video frame that were bounded by the same subframe in the previous frame. In an illustrated embodiment, the set of subframes (12, 16, 20, 24) is shifted once for each successive video frame, and each subframe includes a refresh region (14, 18, 22, 26) whereby the video image frame area (10) is progressively refreshed as the subframes are shifted thereacross. Receiver apparatus (60-82) for use in decoding the independently processed subframe data is also disclosed.
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公开(公告)号：CA2074549C
公开(公告)日：1998-12-22
申请号：CA2074549
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 , H04N7/12 , H04N7/50
Abstract: A method and apparatus for communicating high definition television signals is provided. Video signals are divided into blocks of PCM data. The PCM data is processed using motion estimation and compensation to provide DPCM data. For each block, one of PCM and DPCM data is selected for transmission based on a predetermined criteria. The selected data is compressed using the discrete cosine transform to provide blocks of transform coefficients. The coefficients are quantized to improve their coding efficiency and variable length coded. The variable length coded coefficients are coded using a concatenated coding scheme with a Reed-Solomon outer code and trellis inner code to provide coded signals for transmission. The coded signals are transmitted using QAM.
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公开(公告)号：NO179890C
公开(公告)日：1997-01-02
申请号：NO912273
申请日：1991-06-13
Applicant: GEN INSTRUMENT CORP
Inventor： KRAUSE EDWARD A , PAIK WOO H , LIU VINCENT C , ESSERMAN JIM
Abstract: A method and apparatus are provided for processing digital video signals for transmission in a compressed form. A set of pixel data is compressed without motion compensation to provide a first compressed video signal. The pixel data is compressed using motion compensation to provide a second compressed video signal. The data in the first and second compressed video signals is quantified. A comparison is made to determine which of the signals contains the least data. Successive sets of pixel data are sequentially compressed and quantified and the compressed video signal having the least data for each particular set is selected. The selected signals are encoded to identify them as motion compensated or non-motion compensated signals, and combined to provide a compressed video signal data stream for transmission. Apparatus for receiving and decoding the signals is also disclosed.
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公开(公告)号：AT139402T
公开(公告)日：1996-06-15
申请号：AT91104132
申请日：1991-03-18
Applicant: GEN INSTRUMENT CORP
Inventor： KRAUSE EDWARD A , PAIK WOO H
Abstract: The compression of successive blocks of digital data is optimized by selecting between different compression algorithms or different data formats on a block-by-block basis. In one application, digitized interlaced video signals are processed for transmission in a compressed form. A set of pixel data presented in a field format is compressed to provide a first compressed video signal. The set of pixel data is also presented in a frame format and compressed to provide a second compressed video signal. Errors are evaluated in the first and second compressed video signals. The compressed video signal having the least error is selected for further processing. The technique is repeated for successive sets of pixel data and the selected signals are encoded to identify them as field formatted or frame formatted signals. The encoded selected signals are then combined to provide a compressed video signal data stream for transmission. Apparatus for receiving and decoding the signals is also disclosed.
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公开(公告)号：NO178419C
公开(公告)日：1996-03-20
申请号：NO911107
申请日：1991-03-20
Applicant: GEN INSTRUMENT CORP
Inventor： KRAUSE EDWARD A , PAIK WOO H
Abstract: The compression of successive blocks of digital data is optimized by selecting between different compression algorithms or different data formats on a block-by-block basis. In one application, digitized interlaced video signals are processed for transmission in a compressed form. A set of pixel data presented in a field format is compressed to provide a first compressed video signal. The set of pixel data is also presented in a frame format and compressed to provide a second compressed video signal. Errors are evaluated in the first and second compressed video signals. The compressed video signal having the least error is selected for further processing. The technique is repeated for successive sets of pixel data and the selected signals are encoded to identify them as field formatted or frame formatted signals. The encoded selected signals are then combined to provide a compressed video signal data stream for transmission. Apparatus for receiving and decoding the signals is also disclosed.
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