频带

Then he analysed and researched the frequencies. He found out finally that the parakeet's vocal cords have a special function of membrane vibration. The acoustic frequency of parakeet is very similar that of a myna——380Hz to 720Hz.

这位学者把小鹦鹉所说的"杰根是个小麻雀"这句话用宽频带记录成谱图加以分析研究，结果发现小鹦鹉有特殊的膜振功能，声频与八哥的声频极为相似，即380-720赫兹。

The time-frequency analysis of nonstable torsional vibration signal and multiresolution analysis based on wavelets of torsional vibration signal are introduced in chapter 5 and chapter 6 respectively.

第六章着重讨论了小波分析在扭转振动信号的频带分离和噪声滤除中的应用。

It is found that the change of the frequency characteristics of chaotic system occurs mainly at the frequency band of the chaotic system, in which the input signal exists. The amplitude of the input signal doesn't influence the distortion of the output signal when masking signal is extracted by Oppenheim's chaotic masking.

研究发现，混沌系统频率特性的变化主要发生在输入信号的频率位於混沌系统频带内的情况下；输入信号幅度的大小，不影响输出信号的失真。

A vector signal space is defined by defining the two-dimensional (2D) orthonormal basis functions, and three critical measurements of performance, namely, probability of error, efficiency of spatial spectra and power efficiency are also defined as metrics for comparing candidate modulation schemes.

通过定义于二维空间的正交基函数建立了矢量信号空间，并定义了三个衡量空间信号设计方案性能的指标，即误符号率，频带利用效率和功率效率等。

Output of each filter reflects quantity of signal at that transmission band.

率不同的带通滤波器实现，各个滤波器的输出反映了信号在该通频带内的量值。

An X-band broad bandwidth dual- polarization low side-lobe offset fed paraboloidal reflector antenna is described.

摘 要：介绍了一种宽频带双极化低副瓣天线的设计、加工方法和测试结果。

A simplified signal model of digitalized receiver and the signal model of interference, such as tone interference, autoregressive interference and digital interference, are provided. And it is analyzed in detail the capability of DSSS communication systems in suppressing broadband Gaussian interference, single tone interference and partial band interference.

给出简化的接收机信号模型和常用的窄带干扰模型(音调干扰、AR干扰、低速数字干扰等)，分析了DSSS技术对阻塞高斯干扰、单音干扰、部分频带干扰等的抑制性能。

He cautioned though that: considering the paucity of data, the prediction bands are very wide.

"但他告诫说："考虑到的数据不足，预测频带很宽。

The eight-divider percale can work properly in the 800M Hz frequency, broadband sound, and output swing with 0V~1.8V.

该八分频器可以正常工作在800MHz的频率上，具有较宽的频带范围，电压输出摆幅为0V～1.8V。

For the pitch misgrouping problem caused by no voicing decision in Meddis'pitch extracting method for concurrent speech signals, referring to voicing decision for single speech signal, basing on the analysis of the voicing charater of concurrent speech signals, we present a voicing decision method in pitch extracting for concurrent speech signals. Double periodic degree and frequencies group's distribution degree are introduced for voicing decision of concurrent speech signals.

针对Meddis的基于听觉心理生理的混叠语音基频提取算法中不分清浊音所导致的语音基频错判问题，借鉴了单语音清浊音判断的方法，基于对混叠语音的清浊性能的分析，提出了混叠语音基频提取中的清浊音判断算法，提出了判断混叠语音周期性的双周期度及判断频带组周期性的分布度两个指标，用于混叠语音基频提取中的清浊音判断。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。