As to the problem of sub synchronous resonance (SSR) in thyristor controlled series compensation (TCSC) circuit, a method to real time detect and suppress sub harmonic has been put forward.

A new method is forwarded to detect the rotor position for linear synchronous motor in high speed maglev train based on inductive sensor and DSP.

Synchronous signal is an effective way to implement the blind-detect in audio watermarking.