Trigonometric spline wavelet, being adaptive to processing fault signals of electric power systems, is presented［1］, and it is a symmetrical and semiorthogonal wavelet.

This paper presents a new kind of trigonometric spline wavelets on the interval on the basis of tirgonometric spline functions.

Aiming at the problem,a method of small-beamwidth for ultrasonic range-finding system was given in the paper.

To solve the problem of sky-high modulation frequency requirement in MOG (Micro-Optical Gyroscope), a new double-frequency modulation technology based on triangular wave was proposed.

It is well known that sawtooth wave, square wave, triangular wave, trapezoidal wave can be expressed as the superposition of a series of cosine or sine functions.

Taking the research of nonlinear characteristics of the actuator loop as the point of departure, through the spectrum analysis and the experimental verification, the physical essence of control surface buffet excited by the high-treguency odd harmonic of the triangular wave in a high-gain fly -by-wire system has been discovered.

Besides,constant current and chopping wave method and triangle-wave driving method were adopted to improve the toque performance.

This paper presents a simplified mathematic model of parallel APF, and an improved method of current control with triangle-wave pulse-width modulation.

Aiming at the phenomena of charge injection,charge sharing and clock feedthrough in traditional charge pump,an architecture of a novel and self-balanced CPPLL circuit is presented,which is built on the foundation of the improvement toward the traditional PFD and CP and is applied to the design of a triangle-wave oscillator.