APPLICATIONS OF ODE METHOD

ＡＰＰＬＩＣＡＴＩＯＮＳＯＦＯＤＥＭＥＴＨＯＤＷｕＸｉｎｇｙｕａｎＯｕｙａｎｇＺｉｘｉａｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＮａｎｊｉｎｇＵｎｉｖｅｒｓｉｔｙ，２１００９３，Ｎａｎｊｉｎｇ，ＰＲＣ）ＫｅｙｗｏｒｄｓＯＤＥｍｅｔｈｏ...     

QUADRATIC METHOD IN DETECTING 4-TONES OF PUTONGHUA

分析了普通话四种声调的元音基音周期随时间变化的规律。根据对应四种声调的不同的变化曲线，利用二次分析方法建立了一个实时的四声检测差别规则，并在实践中证明了这种判别规则的实用性。     

ZBF-DMTD SYNTHETICAL METHOD FOR SHORT-TERM FREQUENCY STABILITY MEASUREMENT

This paper presents a zero beat frequency double mixer time difference (ZBF-DMTD) synthetical method for measuring short-term.frequency stability Allen variance σy^2(τ) of frequency sourse. The new method has a high measurement preclsion and is easy to realize and spread in engineering. The paper dlscribes the structure and design of the ZBFDMTD automatic measurement system,and gives the contrast measurement results.