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公开(公告)号：NO178419B
公开(公告)日：1995-12-11
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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公开(公告)号：NO950678L
公开(公告)日：1995-10-12
申请号：NO950678
申请日：1995-02-23
Applicant: GEN INSTRUMENT CORP
Inventor： KRAUSE EDWARD A
Abstract: A method and apparatus are provided for motion compensated coding of interlaced digital video signals. A first prediction error signal is obtained (74) indicative of the difference between a current portion from a field of a current video frame and a similarly situated first portion in the same field of a prior video frame. A second prediction error signal is obtained (76) indicative of the difference between the current portion and a similarly situated second portion in an opposite field of the prior video frame. A third prediction error signal is obtained (78) indicative of the difference between the current portion and an average of the first and second portions. One of the first, second and third prediction error signals is selected (80) to represent the current portion. Motion vector information is provided (72) to enable the current frame portion to which the selected prediction error signal corresponds to be reproduced by a decoder (Fig. 10).
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公开(公告)号：CA2038043C
公开(公告)日：1995-07-18
申请号：CA2038043
申请日：1991-03-12
Applicant: GEN INSTRUMENT CORP
Inventor： KRAUSE EDWARD A , PAIK WOO H
IPC: H04N1/413 , G06T9/00 , H04N7/26 , H04N7/30 , H04N7/32 , H04N7/50 , H04N11/04 , H04N5/38 , H04N7/66
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：AU645936B2
公开(公告)日：1994-01-27
申请号：AU2127892
申请日：1992-08-25
Applicant: GEN INSTRUMENT CORP , QUALCOMM INC
Inventor： LEE CHONG U , KRAUSE EDWARD A , SHEN PAUL X
Abstract: In a broadcast communication system, a plurality of transmitters (T1, T2, ... TM) are located at different locations throughout a broadcast area for separately and synchronously broadcasting a common digital communication signal at a predetermined frequency over different signal paths, and a receiver (10, 12) located within the broadcast area receives the common digital communication signal separately broadcast by a plurality of the transmitters at the predetermined frequency over different signal paths and processes the received signal to reproduce the common digital communication signal without the effects of multipath and other channel distortions. The received signal is modified in relation to the broadcast signal by channel responses of the different signal paths; and the receiver includes an adaptive equalization filter (12) for processing the received signal inversely in accordance with a collection of the channel responses of the different signal paths to reproduce the common digital communication signal without the effects of multipath and other channel distortions. The accuracy of the filter in processing the received signal in accordance with the inverse of the collection of the channel responses of the different signal paths is enhanced by adapting the filter to reproduce a predetermined known common digital communication signal without the effects of multipath and other channel distortions.
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公开(公告)号：CA2091816A1
公开(公告)日：1993-10-26
申请号：CA2091816
申请日：1993-03-17
Applicant: GEN INSTRUMENT CORP
Inventor： PAIK WOO H , LIU VINCENT , SHEN PAUL , KRAUSE EDWARD A
IPC: H04N5/44 , H04N7/50 , H04N7/54 , H04N11/04 , H04N11/24 , H04N19/89 , H04N21/236 , H04N21/2368 , H04N21/2383 , H04N21/40 , H04N21/434 , H04N21/438 , H04N11/02
Abstract: A macroblock packet format is provided for use in a digital HDTV system wherein successive video frames are divided into a plurality of macroblocks. The macroblocks comprise a plurality of superblocks, each containing a plurality of luminance and chrominance video data blocks. A DLEN field is provided in the macroblock packet format to identify the length of the macroblock packet. The packets also include variable length encoded portions of video data. The macroblock packets are transmitted in a data multiplex that also includes a next macroblock position (NMP) word. A receiver compares the DLEN information with the NMP word to verify synchronization, and reacquires the signal if synchronization has been lost.
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Patent Agency Ranking
公开(公告)号：AU3403393A
公开(公告)日：1993-09-30
申请号：AU3403393
申请日：1993-03-05
Applicant: GEN INSTRUMENT CORP
Inventor： POLLMANN STEPHEN C , KRAUSE EDWARD A , SHEN PAUL , PAIK WOO H , MORONEY PAUL
Abstract: Apparatus (10) is provided for decoding variable length code words to recover transform coefficients, such as DCT transform coefficients provided by a high definition television encoder. A first category of the code words has a length of no more than n bits. A second category has a length of greater than n bits. A feedback ROM (22) is used to decode the code words. Code words from the first category are processed by directly addressing a lookup table (80) in the ROM (22). Code words from the second category are processed using multiple passes through the ROM (22), wherein a portion of the data output during a prior pass is fed back (90) to address the memory during a subsequent pass.
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公开(公告)号：CA2091815A1
公开(公告)日：1993-09-27
申请号：CA2091815
申请日：1993-03-17
Applicant: GEN INSTRUMENT CORP
Inventor： POLLMANN STEPHEN C , KRAUSE EDWARD A , SHEN PAUL , PAIK WOO H , MORONEY PAUL
Abstract: Apparatus (10) is provided for decoding variable length code words to recover transform coefficients, such as DCT transform coefficients provided by a high definition television encoder. A first category of the code words has a length of no more than n bits. A second category has a length of greater than n bits. A feedback ROM (22) is used to decode the code words. Code words from the first category are processed by directly addressing a lookup table (80) in the ROM (22). Code words from the second category are processed using multiple passes through the ROM (22), wherein a portion of the data output during a prior pass is fed back (90) to address the memory during a subsequent pass.
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公开(公告)号：NO924452L
公开(公告)日：1993-05-20
申请号：NO924452
申请日：1992-11-18
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 , H04N7/00 , H04N5/14
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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公开(公告)号：NO923422L
公开(公告)日：1993-03-08
申请号：NO923422
申请日：1992-09-02
Applicant: GEN INSTRUMENT CORP , QUALCOMM INC
Inventor： LEE CHONG U , KRAUSE EDWARD A , SHEN PAUL X
Abstract: In a broadcast communication system, a plurality of transmitters (T1, T2, ... TM) are located at different locations throughout a broadcast area for separately and synchronously broadcasting a common digital communication signal at a predetermined frequency over different signal paths, and a receiver (10, 12) located within the broadcast area receives the common digital communication signal separately broadcast by a plurality of the transmitters at the predetermined frequency over different signal paths and processes the received signal to reproduce the common digital communication signal without the effects of multipath and other channel distortions. The received signal is modified in relation to the broadcast signal by channel responses of the different signal paths; and the receiver includes an adaptive equalization filter (12) for processing the received signal inversely in accordance with a collection of the channel responses of the different signal paths to reproduce the common digital communication signal without the effects of multipath and other channel distortions. The accuracy of the filter in processing the received signal in accordance with the inverse of the collection of the channel responses of the different signal paths is enhanced by adapting the filter to reproduce a predetermined known common digital communication signal without the effects of multipath and other channel distortions.
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公开(公告)号：NO923422A
公开(公告)日：1993-03-08
申请号：NO923422
申请日：1992-09-02
Applicant: GEN INSTRUMENT CORP , QUALCOMM INC
Inventor： LEE CHONG U , KRAUSE EDWARD A , SHEN PAUL X
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