The paper introduces the signal conversion principle,auto control circuit principle and related parameters calculation when turbo type flow numeric control meter is applied on length control.

The performance of a narrow band interference rejection scheme using the transform domain signal processing is studied.

To meet the demand of the conversion of DC voltage ratio signals to ARINC 429 data signals,based on the simple analysis of I/O signal properties,signal conversion modules and implementation concepts of the functional modules are discussed.

Application of signal transform method to highway observation;

Using space vector pulse-width modulation(SVPWM) signal transformation method,speed regulation of induction motor is implemented by controlling the duty ratio of every converter switch.