公开(公告)号：NO924822A

公开(公告)日：1993-06-25

申请号：NO924822

申请日：1992-12-14

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 ,  H04N7/12

CPC classification number: H04N21/2365 ,  H04N19/115 ,  H04N19/124 ,  H04N19/15 ,  H04N19/152 ,  H04N19/176 ,  H04N19/30 ,  H04N21/23655 ,  H04N21/4347

公开(公告)号：CA2084178A1

公开(公告)日：1993-06-25

申请号：CA2084178

申请日：1992-11-30

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

Abstract: A multichannel image compression system uses a plurality of encoders (10, 12 ... 14) to compress image data. A coding level command is provided to each of the encoders to specify a level of quality to be provided by each encoder. Encoded image data, provided by the encoders in response to the coding level command, is multiplexed (26) into a combined signal for transmission. The coding level command is adjusted in response to an accumulated amount of data from the combined signal, to maintain the accumulated data within a throughput capability of a communication channel (48). Although the coding level command may specify a global coding level that is the same for all of the encoders, the encoders can derive local coding levels from the global coding level to provide different encoding qualities. Decoder apparatus (30-46) is provided to recover an image from the compressed image data.

公开(公告)号：CA2082133A1

公开(公告)日：1993-05-20

申请号：CA2082133

申请日：1992-11-04

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

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.

公开(公告)号：MX9206693A

公开(公告)日：1993-05-01

申请号：MX9206693

申请日：1992-11-19

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 ,  G05B19/00

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.

公开(公告)号：NO924111L

公开(公告)日：1993-04-26

申请号：NO924111

申请日：1992-10-23

Applicant: GEN INSTRUMENT CORP

Inventor： KRAUSE EDWARD A

IPC: H04N7/32 ,  H04N5/14 ,  H04N7/26 ,  H04N7/36 ,  H04N7/137 ,  H03M7/30

Abstract: Digital video signals are adaptively compressed for communication to a receiver. A plurality of block-matching motion compensators (30, 32), each using a different block size, compare current video image data to prior video image data. Video image data output from the motion compensators is compressed (14, 18), and the compressed data from each motion compensator is compared (20) to find which motion compensator results in the least amount of compressed data for a region of a current video image corresponding to the smallest of the block sizes. The compressed data having the lowest bit count is transmitted to a receiver for recovery of a motion vector. The recovered motion vector is used to recover current video image data from the transmitted data and previously received video image data.

公开(公告)号：NO924111A

公开(公告)日：1993-04-26

申请号：NO924111

申请日：1992-10-23

Applicant: GEN INSTRUMENT CORP

Inventor： KRAUSE EDWARD A

IPC: H04N7/32 ,  H04N5/14 ,  H04N7/26 ,  H04N7/36 ,  H04N7/137 ,  H03M7/30

CPC classification number: H04N5/145 ,  H04N19/30 ,  H04N19/503 ,  H04N19/51

公开(公告)号：CA2079862A1

公开(公告)日：1993-04-25

申请号：CA2079862

申请日：1992-10-05

Applicant: GEN INSTRUMENT CORP

Inventor： KRAUSE EDWARD A

IPC: H04N7/32 ,  H04N5/14 ,  H04N7/26 ,  H04N7/36 ,  H04N7/137 ,  H04N7/015

Abstract: Digital video signals are adaptively compressed for communication to a receiver. A plurality of block-matching motion compensators (30, 32), each using a different block size, compare current video image data to prior video image data. Video image data output from the motion compensators is compressed (14, 18), and the compressed data from each motion compensator is compared (20) to find which motion compensator results in the least amount of compressed data for a region of a current video image corresponding to the smallest of the block sizes. The compressed data having the lowest bit count is transmitted to a receiver for recovery of a motion vector. The recovered motion vector is used to recover current video image data from the transmitted data and previously received video image data.

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).

公开(公告)号：NO920516D0

公开(公告)日：1992-02-10

申请号：NO920516

申请日：1992-02-10

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 ,  H04N

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.

公开(公告)号：AU7808191A

公开(公告)日：1991-12-19

申请号：AU7808191

申请日：1991-05-30

Applicant: GEN INSTRUMENT CORP

Inventor： KRAUSE EDWARD A ,  PAIK WOO H ,  LIU VINCENT ,  ESSERMAN JIM

IPC: H03M7/30 ,  G06T9/00 ,  H04N7/26 ,  H04N7/32 ,  H04N7/36 ,  H04N7/50 ,  H04N7/13 ,  H04N7/137 ,  H04N7/133

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.