基于BP神经网络的音乐情感分类及评价模型

针对多音轨MIDI文件,提出一种多音轨MIDI音乐主旋律识别方法,通过对表征音乐旋律特征的音高、音长、音色、速度和力度5个特征向量的提取,构建基于BP神经网络的情感模型,并且用200首不同情感特征的歌曲对其进行训练和验证。实验结果显示取得了较好的效果。     

MIDI播放编辑器的实现

提出了一种MIDI播放编辑器(也称音序器)的实现方法,并给出了MIDIAPI函数的应用,最后利用VB,API,ACCESS实现。实践证明,该播放编辑器稳定可靠,易操作且音色优美。     

一种新型实用的光纤连接系统

本文提出了一种新型实用的乐器数字接口（MIDI）的光纤连接系统，用光纤替代电缆连接MIDI设备，解决了MIDI数字信号对音频信号的干扰问题，增加了MIDI信号的传送距离，指出了光纤在乐器数字接口连接方面有很好的应用前景。     

Accurate partial atomic charges for high-energy molecules using class IV charge models with the MIDI! basis set

We have recently developed a new class IV charge model for calculating partial atomic charges in molecules. The new model, called charge model 3 (CM3), was parameterized for calculations on molecules containing H, Li, C, N, O, F, Si, S, P, Cl, and Br by Hartree–Fock theory and by hybrid density functional theory (HDFT) based on the modified Perdew–Wang density functional with several basis sets. In the present article, we extend CM3 for calculating partial atomic charges by Hartree–Fock theory with the economical but well balanced MIDI! basis set. Then, using a test set of accurate dipole moments for molecules containing nitramine functional groups (which include many high-energy materials), we demonstrate the utility of several parameters designed to improve the charges in molecules containing both N and O atoms. We also show that one of our most recently developed CM3 models that is designed for use with wave functions calculated at the mPWXPW91/MIDI! level of theory (where X denotes a variable percentage of Hartree–Fock exchange) gives accurate charge distributions in nitramines without additional parameters for N and O. To demonstrate the reliability of partial atomic charges calculated with CM3, we use these atomic charges to calculate polarization free energies for several nitramines, including the commonly used explosives 1,3,5-trinitro-s-triazine (RDX) and 2,4,6,8,10,12-hexanitrohexaazaisowurtzitane (HNIW), in nitromethane. These polarization energies are large and negative, indicating that electrostatic interactions between the charge distribution of the molecule and the solvent make a large contribution to the free energy of solvation of nitramines. By extension, the same conclusion should apply to solid-state condensation. Also, in contrast to some other charge models, CM3 yields atomic charges that are relatively insensitive to the presence of buried atoms and small conformational changes in the molecule, as well as to the level of treatment of electron correlation. This type of charge model should be useful in the future development of solvation models and force fields designed to estimate intramolecular interactions of nitramines in the condensed phase.     

MIDI Sherlock微生物自动鉴定系统鉴定方法的建立——以贻贝中分离的蜡样芽胞杆菌为例

研究了用MIDI Sherlock微生物自动鉴定系统对贻贝中分离的蜡样芽孢杆菌自动鉴定方法的建立,通过培养基和取菌量的不同展开分析,并用生理生化鉴定和PCR鉴定来验证其准确性.结果表明：MIDI鉴定系统对于用TSBA培养基培养的蜡样芽孢杆菌鉴定的准确率比用营养琼脂培养基培养的要高,而且取菌量为100~120mg组鉴定时的准确率要高于其他取菌量的组,说明培养基和取菌量的不同都会对该系统的鉴定结果产生影响.最后确定蜡样芽孢杆菌鉴定方法为：TSBA培养待检微生物,获菌量控制在100~120 mg之间,生理生化鉴定和PCR鉴定验证了该方法的准确性.     

电声学科的跨越特点和应用进展

本文综述了电声学科由于具有跨越科学与艺术两大领域和跨越多种学科的性质所带来的研究和应用特点,提出了几项近些年值得重视的应用领域和可能发展趋势,希望引起同仁讨论。鉴于我国在其中有些方面有突出成绩,本文将特别加以介绍,也希望得到大家的关心。本文还有一个附带的期望：促进非电声学科的声学工作者了解和关心电声学科的核心。     

基于FPGA的乐器数字接口音乐FM合成器

给出了一种乐器数字接口(MIDI)音乐电子合成器的FPGA实现方法.该合成器以MIDI技术为基础,在Cyclone系列FPGA芯片EPIC6Q240C8上实现数字音频合成.算法采用数字式FM音频合成方式,32复音(和弦),通过对参数的合理配置,可模拟小号、长笛、单簧管、巴松、风琴、钟琴等乐器音色.另外,还实现了一个低音增强数字音频效果器,充分利用了FPGA资源.