In the DB2 procedure example in Table 6, the SIGNAL statement is used to generate a user-defined SQLSTATE and a message that is returned to the caller through the SQLCA.

在表6的DB 2过程示例中，signal语句用于生成用户定义的SQLSTATE和一条消息，该消息通过SQLCA返回给调用方。

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Only then it will signal to the caller that the presented certificate was successfully verified.

在此之后，它才会向调用者发出已经成功地检查了提供的证书的信号。

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The core of Caller ID detection is demodulation of the FSK signal. The common used FSK demodulation algorithm demodulates the FSK signal by spectrum analysis.

来电显示的核心部分就是对来电显示信号即FSK信号的解调。

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