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    • 7. 发明授权
    • Digital automatic gain control of a multilevel optical disc read signal
    • 数字自动增益控制多级光盘读取信号
    • US07414942B2
    • 2008-08-19
    • US10981327
    • 2004-11-04
    • Steven R. SpielmanYung-Cheng LoDavid C. LeeJudith C. Powelson
    • Steven R. SpielmanYung-Cheng LoDavid C. LeeJudith C. Powelson
    • G11B20/10
    • G11B20/1252G11B7/0045G11B7/005G11B7/00745G11B7/013G11B20/10009G11B20/1403G11B20/1833G11B27/19G11B27/24G11B27/3027G11B2020/1222G11B2020/1268G11B2020/1275G11B2020/1287G11B2220/20G11B2220/2537H03M13/00H03M13/23
    • A system and method are disclosed for providing a gain control signal for a multilevel read signal. In one embodiment, maximum automatic gain control marks are periodically inserted amongst a series of data fields. The automatic gain control marks include a series of high level marks such that the maximum signal detected in the interior portion of each maximum automatic gain control mark is not reduced by intersymbol interference. Minimum automatic gain control marks are also periodically inserted amongst a series of data fields. The automatic gain control marks include a series of high level marks such that the maximum signal detected in the interior portion of each minimum automatic gain control mark is not reduced by intersymbol interference. In another embodiment, multilevel signals are encoded to facilitate automatic gain control. The effect of a plurality of candidate merge symbols on the residual running total power associated with a current data block is determined. A preferred merge symbol is selected based on a residual running total power minimization criteria. The preferred merge symbol is added to the current data block.
    • 公开了一种用于提供多电平读信号的增益控制信号的系统和方法。 在一个实施例中,最大自动增益控制标记被周期地插入到一系列数据字段中。 自动增益控制标记包括一系列高电平标记,使得在每个最大自动增益控制标记的内部检测到的最大信号不会因符号间干扰而减小。 最小自动增益控制标记也定期插入一系列数据字段中。 自动增益控制标记包括一系列高电平标记,使得在每个最小自动增益控制标记的内部检测到的最大信号不被码间干扰减小。 在另一个实施例中,多电平信号被编码以便于自动增益控制。 确定多个候选合并符号对与当前数据块相关联的剩余运行总功率的影响。 基于剩余运行总功率最小化标准来选择优选的合并符号。 优选的合并符号被添加到当前数据块。