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张俊祥 《南京邮电大学学报(自然科学版)》1991,(1)
本文基于PAL信号的频谱特点,分析了由2H延迟线组成的梳状滤波器分离亮度信号的原理,给出了实验电路框图,并简要叙述了误差带来的影响。 相似文献
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本文结合自己的工作实践就企业制度文化建设问题进行了分析探讨,就制度文化的概念,制度文化演进应遵循的原则,如何保持制度制定与文化理念的一致性等方面根据企业的实践进行了比较详细地论述,提出了自己的见解。 相似文献
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This study presents evidence from analyses of the acoustic parameters of fluent continuous speech to show that within-paragraph prosodic phrase boundaries are related more to contrasts of neighborhood prosodic states rather than between-phrase pause durations; prosodic states receive more constraints from higher level discourse information. By revising a modular acoustic model by Tseng's hierarchical prosodic phrase grouping framework and examining the much varied prosodic phrase (PPh) boundary B3 within speech paragraph, we show that statistical accounts of layered contributions reveal distinct contrasts between boundary immediate duration and intensity patterns irrespective of pause duration. Contrasts of FO contour patterns were also observed in these locations. Evidence was also obtained to illustrate how PPh boundary states are specified more by higher level discourse information than by lower level prosodic word construction. These combined results suggest that contrastive neighboring prosodic states are more significant cues to PPh boundaries than boundary pause duration. The results also help explain why in fluent speech between-phrase pause durations vary greatly, and can be applied to automatic speech segmentation. 相似文献
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<正>20世纪末以来,关键技术的研发一直受到各国的高度重视。《国家中长期科学和技术发展规划纲要(2006-2020年)》配套政策第33条规定"国家科技部门、综合经济部门会同有关部门按照行业和领域特点共同编制并定期发布应掌握自主知识产权的关键技术和重要产品目录",说明我国把关键技术目录作为一项重要的技术政 相似文献
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<正>大量药物专利保护期结束,非专利药将得到快速发展,仿制药迎来发展高潮。近年来,随着数十种"重磅炸弹"级专利药专利保护期的相继到期,专利药和非专利药的市场竞争越来越激烈。目前,非专利药已经对专利药造成严重威胁。由于看好非专利药极大的利润和发展空间,许多大的制药公司和企业竞相进入非专利药市场,由此带来了仿制药发展的高潮。 相似文献
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通过区县图书馆在新形势下在科技兴农中的地位和作用,如何全面收集,系统整理科技资料,充分发挥这些资料作用,提出区县图书馆为发展农村经济科技服务的一些措施。 相似文献