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    • 11. 发明授权
    • Method and apparatus for forward error correction in a content distribution system
    • 内容分发系统中前向纠错的方法和装置
    • US07451361B2
    • 2008-11-11
    • US11302445
    • 2005-12-13
    • Mark S. Schmidt
    • Mark S. Schmidt
    • H03M13/27H03M13/29
    • H04L27/3488H03M13/11H04L1/0041H04L1/0057H04L1/0065H04L1/0071H04L27/3416H04L2001/0098
    • Method and apparatus for encoding transport stream packets is described. In one example, frames of transport stream packets are block coded to produce block coded symbols. The block coded symbols are interleaved for each of the frames using convolutional interleaving to produce interleaved data. The interleaved data is randomized. The interleaved data is set partitioned for each of the frames into un-coded bits and bits to be encoded. For each of the frames: A low density parity check (LDPC) code is applied to the bits to be encoded to generate a codeword having information bits and parity bits. Groups of interleaved bits are generated from bits in the codeword. Symbols formed from the groups of interleaved bits and the un-coded bits are mapped to points in a quadrature amplitude modulation (QAM) constellation.
    • 描述了用于编码传输流分组的方法和装置。 在一个示例中,传输流分组的帧被块编码以产生块编码符号。 使用卷积交织来对每个帧交织块编码符号以产生交错数据。 交织数据是随机的。 为每个帧将交织的数据设置为未编码的比特和要被编码的比特。 对于每个帧:将低密度奇偶校验(LDPC)码应用于要编码的比特,以生成具有信息比特和奇偶校验比特的码字。 交错比特组由码字中的比特生成。 由交错比特组和未编码比特组形成的符号被映射到正交幅度调制(QAM)星座中的点。
    • 12. 发明授权
    • Automatic range adjustment techniques for stand-mountable bar code scanners
    • 用于独立式条码扫描器的自动范围调整技术
    • US06637655B1
    • 2003-10-28
    • US09589853
    • 2000-06-08
    • Donald T. HudrickDavid M. Wilz, Sr.Garrett K. RussellGeorge B. RocksteinMark S. Schmidt
    • Donald T. HudrickDavid M. Wilz, Sr.Garrett K. RussellGeorge B. RocksteinMark S. Schmidt
    • G06K710
    • G06K7/10851
    • By automatically adjusting the object detection mechanism of a bar code scanner from a long range mode of operation to a short range mode of operation, the scanner will remain capable of detecting and decoding bar codes even if the object detection mechanism repeatedly detects the presence of a background object. The techniques of the present invention commence when the bar code scanner is placed in a position such that the scanner's object detection mechanism repeatedly detects a background object such as a counter top or conveyer belt. The object detection mechanism is set to the long range mode of operation if it is not already so set. In the case of a stand-mounted scanner, a test is performed to ascertain whether or not the scanner is in its stand, and the method will only proceed once the scanner is resting in the stand. Next, the scanner is programmed to wait for a predetermined amount of time, after which the operational mode of the object detection mechanism is changed from the long range mode to the short range mode. At this time, the object detection mechanism no longer detects the presence of the background object. The scanner will now detect any new objects that enter the field of view of the object detection mechanism, and attempt to read any bar codes which may be present
    • 通过将条形码扫描器的物体检测机构从长距离操作模式自动调整到短距离操作模式,即使对象检测机构重复地检测到条形码的存在,扫描器仍然能够检测和解码条形码 背景对象。 当条形码扫描器被放置在使得扫描仪的物体检测机构重复地检测诸如台面或输送带的背景物体的位置时,本发明的技术开始。 物体检测机构如果尚未设置,则设置为长距离操作模式。 在立式扫描仪的情况下,执行测试以确定扫描仪是否在其支架中,并且该方法将仅在扫描仪搁置在支架中时进行。 接下来,将扫描器编程为等待预定量的时间,之后将对象检测机构的操作模式从长距离模式改变为短距离模式。 此时,对象检测机构不再检测出背景物体的存在。 扫描仪现在将检测进入物体检测机构的视野的任何新对象,并尝试读取可能存在的任何条形码
    • 14. 发明授权
    • Method and apparatus for forward error correction in a content distribution system
    • 内容分发系统中前向纠错的方法和装置
    • US07555696B2
    • 2009-06-30
    • US11286497
    • 2005-11-23
    • Mark S. Schmidt
    • Mark S. Schmidt
    • H03M13/00
    • H03M13/255H03M13/11H03M13/27H04L1/0041H04L1/0045H04L1/0058H04L1/007H04L1/0071H04L27/34
    • Method, apparatus, and computer readable medium for forward error correction (FEC) in a content distribution system is described. One aspect of the invention relates to encoding frames of content. In one example, each frame is set partitioned into un-coded bits and bits to be encoded. For each frame, parity bits are computed for the bits to be encoded using low density parity check (LDPC) coding to generate a codeword having information bits and the parity bits. Groups of interleaved bits from the information bits in the codeword are generated. Symbols formed from the bit groups and the un-coded bits are pseudorandomly interleaved. The symbols are then mapped to points in a quadrature amplitude modulation (QAM) constellation.
    • 描述内容分发系统中用于前向纠错(FEC)的方法,装置和计算机可读介质。 本发明的一个方面涉及编码内容帧。 在一个示例中,将每个帧划分为未编码的比特和要编码的比特。 对于每个帧,使用低密度奇偶校验(LDPC)编码来计算要编码的比特的奇偶校验位,以生成具有信息比特和奇偶校验位的码字。 生成来自码字中的信息比特的交织比特组。 由比特组和未编码比特形成的符号被伪随机交织。 然后将符号映射到正交幅度调制(QAM)星座中的点。
    • 18. 发明授权
    • Automatic range adjustment techniques for stand-mountable bar code scanners
    • 用于独立式条码扫描器的自动范围调整技术
    • US06863217B2
    • 2005-03-08
    • US10639455
    • 2003-08-13
    • Donald T. HudrickDavid M. Wilz, Sr.Garrett K. RussellGeorge B. RocksteinMark S. Schmidt
    • Donald T. HudrickDavid M. Wilz, Sr.Garrett K. RussellGeorge B. RocksteinMark S. Schmidt
    • G06K7/10
    • G06K7/10851
    • By automatically adjusting the object detection mechanism of a bar code scanner from a long range mode of operation to a short range mode of operation, the scanner will remain capable of detecting and decoding bar codes even if the object detection mechanism repeatedly detects the presence of a background object. The techniques of the present invention commence when the bar code scanner is placed in a position such that the scanner's object detection mechanism repeatedly detects a background object such as a counter top or conveyer belt. The object detection mechanism is set to the long range mode of operation if it is not already so set. In the case of a stand-mounted scanner, a test is performed to ascertain whether or not the scanner is in its stand, and the method will only proceed once the scanner is resting in the stand. Next, the scanner is programmed to wait for a predetermined amount of time, after which the operational mode of the object detection mechanism is changed from the long range mode to the short range mode. At this time, the object detection mechanism no longer detects the presence of the background object. The scanner will now detect any new objects that enter the field of view of the object detection mechanism, and attempt to read any bar codes which may be present
    • 通过将条形码扫描器的物体检测机构从长距离操作模式自动调整到短距离操作模式,即使对象检测机构重复地检测到条形码的存在,扫描器仍然能够检测和解码条形码 背景对象。 当条形码扫描器被放置在使得扫描仪的物体检测机构重复地检测诸如台面或输送带的背景物体的位置时,本发明的技术开始。 物体检测机构如果尚未设置,则设置为长距离操作模式。 在立式扫描仪的情况下,执行测试以确定扫描仪是否在其支架中,并且该方法将仅在扫描仪搁置在支架中时进行。 接下来,将扫描器编程为等待预定量的时间,之后将对象检测机构的操作模式从长距离模式改变为短距离模式。 此时,对象检测机构不再检测出背景物体的存在。 扫描仪现在将检测进入物体检测机构的视野的任何新对象,并尝试读取可能存在的任何条形码
    • 19. 发明授权
    • Method and apparatus for modifying a transport packet stream to provide
concatenated synchronization bytes at interleaver output
    • 用于修改传输分组流以在交织器输出处提供级联同步字节的方法和装置
    • US5771239A
    • 1998-06-23
    • US560008
    • 1995-11-17
    • Paul MoroneyMark S. Schmidt
    • Paul MoroneyMark S. Schmidt
    • H03M13/27H03M13/29H04N19/89H04N21/2383H04N21/438H04J3/24
    • H04N21/2383H03M13/2732H03M13/29H04N19/89H04N21/4382
    • An MPEG transport packet stream or the like is modified to provide concatenated synchronization bytes at an output of an interleaver receiving the modified packet stream. A conventional sync byte located in a first transport packet is replaced with a first substitute sync byte. A conventional sync byte located in a conventional sync byte position of a second transport packet is deleted. Another byte from the second transport packet is moved to the position of the deleted sync byte to open a desired byte position in the second transport packet. A second substitute sync byte is inserted into the desired byte position. The first and second transport packets and the desired byte position are selected to provide the first and second substitute sync bytes at locations in the modified packet stream where the first substitute sync byte will be concatenated with the second substitute sync byte at the output of the interleaver. The transport packet stream can be further modified to provide concatenated auxiliary bytes at the output of the interleaver.
    • 修改MPEG传输分组流等,以在接收修改的分组流的交织器的输出处提供级联的同步字节。 位于第一传输分组中的常规同步字节被替换为第一替代同步字节。 位于第二传输分组的常规同步字节位置的常规同步字节被删除。 来自第二传输分组的另一个字节被移动到删除的同步字节的位置,以在第二传输分组中打开所需的字节位置。 将第二个替代同步字节插入到所需的字节位置。 选择第一和第二传输分组和期望的字节位置以在修改分组流中的位置处提供第一和第二替代同步字节,其中第一替代同步字节将与交织器的输出处的第二替代同步字节连接 。 可以进一步修改传输分组流,以在交织器的输出端提供连接的辅助字节。