TCM是把纠错编码与调制相结合的一种技术，将编码与调制作为一个整体同时进行处理，既有纠错能力又有频带压缩能力，基本原则是利用信号集的冗余度来提高纠错能力，从而在不扩展占用频带的前提下提高编码增益。这样就可以在传输功率和带宽都不变的同时提高数字传输系统的可靠性。-TCM is the error correction coding and modulation of a combination of technology, coding and modulation processing as a

RLC串联的可测定RLC串联电路的品质因素Q、谐振频率、通频带BW等参数；激励源自制可数控等。-RLC series RLC series circuit can measure the quality factor Q, resonant frequency passband BW and other parameters incentive system can be derived from CNC.