| 摘要 |
A received signal having a series of T-spaced symbols having more than two levels is sampled at a rate that produces successive samples S<SUB>P</SUB>, S<SUB>C</SUB>, and S<SUB>N </SUB>substantially equally spaced by T/2. An output representing the difference between the sign of the sample S<SUB>N </SUB>and the sign of the sample S<SUB>P </SUB>is generated, and the value of the sample S<SUB>C </SUB>is offset so that the value of the sample S<SUB>C </SUB>approaches zero. The offset value of the sample S<SUB>C </SUB>and the generated output are multiplied together in order to provide a timing error signal. The sampling of the received signal is controlled in accordance with the timing error signal.
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