STUDY ON PHASE PERCEPTION IN SPEECH

The perceptual effect of the phase information in speech has been studied by auditory subjective tests. On the condition that the phase spectrum in speech is changed while amplitude spectrum is unchanged, the tests show that: (1) If the envelop of the reconstructed speech signal is unchanged, there is indistinctive auditory perception between the original speech and the reconstructed speech; (2) The auditory perception effect of the reconstructed speech mainly lies on the amplitude of the derivative of the additive phase; (3) td is the maximum relative time shift between different frequency components of the reconstructed speech signal. The speech quality is excellent while td <10ms; good while 10ms< td <20ms; common while 20ms< td <35ms, and poor while td >35ms.     

空间交会对接用激光雷达敏感器

本文讨论了在航天飞行器的空间交会对接(RVD)技术中采用激光雷达敏感器的可行性。提出在航天飞行器的自主交会对接技术中,应采用一种简单、实用的单目标系统。     

用程序升温脱附研究Nd_（1－x）Sr_xMnO_3体系氧的吸附、脱附特性

用氧的程序升温脱附（ＴＰＤ）技术测试了钙钛矿型复合氧化物Ｎｄ（１－ｘ）ＳｒｘＭｎＯ３（ｘ＝０．０，０．２，０．４，０．６，０．８，１．０）系列试样体相内的缺陷结构．发现随着Ｘ的变化，脱附氧量呈现出不同的变化规律。对此，用晶体化学和固体化学的基本理论进行了解释。     

动力能源调度监控技术在冶金企业的应用

总结了动力能源调度监控技术在冶金企业的应用情况，介绍了这项技术的发展历程及企业在应用时需要注意的几个重要事项，分析了目前存在的问题，提出了相应对策。     

Quantitative analysis of organochlorine pesticide residues in Chinese drugs

This paper reports the GC determination of 20 organochlorine pesticides in Chinese drugs Flos Ionicerae and Moluodan etc by the present method of Japan for determinaing pesticide residues. The results suggest that except Folium Isatidis, Radix Codonopsis and Sanqi Pian all accord with the for provisions pesticide residues in Japanese foodstuffs.     

CROSS-SPECTRAL MOMENT AND SVD METHODS ESTIMATING THE PARAMETERS OF CLOSE SINUSOIDS IN COLORED NOISE

The cross-spectral estimation methods are efficient in estimating the parameters of sinusoidal signals embedded in colored noise. But up to now, only FPT and cross-periodogram methods are used in this field, the modern auto-spectral estimation method is introduced into cross-spectral estimation in this paper, meanwhile the cross-correlation based Yule-Walker equation is proposed theoretically and the moment and singular-value decomposition (SVD)) algorithms for cross-spectral estimation have been developed. Finally, a numerical example is given for comparing the presented methods with the well-known Cadzow's SVD method.     

片式阻容元件的现状和发展方向

在国外的片式元器件（ＳＭＤ）中，片式阻容元件发展最快，主要表现为片式化率迅速上升，尺寸越来越小，性能越来越好，包装形式多样化和生产管理不断改进。本文综述了国外阻容元件在这些方面的进展，指出了我国的差距，提出了我国如何发展的措施。     

模糊数学在电视机故障诊断中的应用

本文介绍了应用模糊数学方法进行计算机辅助诊断电视机的故障原因,这种方法有效性在于建立模型的因果关系正确性和自动搜索范围及速度。     

低速爆轰管对黑火药的点传火性能研究

文章采用中心点火管结构的实验装置研究了黑火药的点传火性能。用低速爆轰 (L VD)中心点火管来点燃黑火药时 ,1# ～ 3# 大粒黑药的传火速度为 70 0 m· s-1～ 80 0 m· s-1数量级 ,燃烧波宽度在 3.1ms～ 3.5 ms,最大压力峰值 :1# 为 36 .4 MPa,2 # 为 2 4 .0 MPa,3# 为 38.0 MPa。用普通中心点火管点燃黑火药时 ,2 # 、3# 和钝化 2 # 大粒黑的传火速度分别为 6 1.2 m· s-1、6 8.2 m·s-1和 4 0 .1m· s-1,最大燃烧波宽度分别为 9.2 ms、6 .3ms和 9.5 ms。燃烧波表明 ,L VD中心传火管与普通中心传火管相比较 ,在传火管的不同位置处 ,前者的 P- t曲线一致性远高于后者。     

低空间频率银盐明胶全息图的浮雕特性研究及其应用

通过实验研究表明，对低空间频率的振幅型银盐全息图形表面已形成浮雕，经漂白，浮雕深度成倍加深；浮雕深度随空间频率而变化，并且可用不同曝光量进行调制。选择适当条件，可降低零级光强，提高全息图的一级衍射效率。