线路码；频谱变换；位定时提取。

FPGA; line code; spectrum transform; bit timing pick-up.

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并在简单定时提取电路（STC）的具体情况下与其它推导方式的结论进行了分析比较。

Their specific results in the simple timing extraction circuit(STC) condition are compared with those from other deductive methods.

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一开始，从 LINEITEM 表中提取规定时期内通过邮寄或海运发货的行项目所对应的订单号。

Initially, order keys corresponding to line items shipped by mail or sea during the qualifying time period are extracted from the LINEITEM table.

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