查询词典 digital signals

The primary function of the system through the compression of speech signals in order to achieve high-efficiency digital audio recording, can be used for telephone message, voice response and so on.

本系统的主要功能是通过对语音信号进行压缩，以实现高效率数字录音，可以用于电话留言，语声应答等场合。

Our system's main functions are to compress the sound signals so as to achieve efficent digital recording. It can be applied in telephone message,voice response and etc.

本系统的主要功能是通过对语音信号进行压缩，以实现高效率数字录音，可用于电话留言，语声应答等场合。

Its software uses system self-detecting algorithm to assure measurement channel .It uses softening hardware technique software synchronic data sampling to trace the frequency of exterior signal, in other words , it gives sampling control signals 128 times of power net's frequency .It uses Direct Digital Frequency Synthetics algorithm to transform radical sine waveform parameter table into needed current. It uses FFT algorithm to get radical waveform altitude of current ,voltage and resistor .

整个系统在软件设计上采用系统自检验算法保证测量通道可用，采用硬件软化技术--软件锁相环技术，达到对外部信号频率的跟踪，给出频率为电网工频128倍的采样控制信号：直接数字频率合成技术将基波参数表转换成需要的电流信号，采用FFT变换及基波幅度的计算方法得到被测电流、电压基波幅度和电阻大小。

By time-varying filtering, we realize the signal selectivity and interference suppression, especially for the signals with time-varying power spectrum. It is shown herein that conventional eigenstructure based methods are lower dimensional special case of the time-frequency subspace fitting method. The closed-form array response estimation algorithms for blind source separation in wireless communication is also developed in the dissertation by exploiting the data structure of second-order statistics of the array output in the presence of multipath. The proposed method achieves array response estimation with little constraint on signal property and propagation environment such as scatters or angular spread. Moreover, the array utilized here can be of arbitrary geometry and even uncalibrated. Since the closed-form solution is obtained, no misconvergency may occur and large amount of computation can be saved. The equivalent feed model and corresponding optimization designation are proposed to realize the downlink multi-user selective transmission. By coherent and non-coherent superposition of the electromagnetical field, multiple beams can be formed using a single array, so that each co-channel user signal is transmitted in each beam and will not interfered with each other. The proposed system scheme implements the digital beamforming and the channel allocation in the base band, therefore is suitable for the utilization of the radio software technology. The feasibility and effectiveness of the proposed model are proved by the RF experiment.

在窄带条件下，GSC－SSF方法还可以提高阵列的虚拟孔径，从而提高估计的性能；可以证明，Cyclic DOA 和SC-SSF方法可看作该方法的特例或近似； 3、提出了二维GSC－SSF方法和宽带谱相关DOA矩阵方法，利用信号的循环平稳特性解决了宽带条件下二维 DOA 估计问题，并具有阵元数少、计算量较小的特点； 4、提出了时频子空间拟合和宽带时频DOA估计算法，将联合时频分析的理论和方法引入到阵列信号的空间谱估计研究中，利用时变滤波实现信号选择性测向和干扰抑制，特别适合于谱时变信号；可以证明传统特征结构法可看作是时频子空间拟合方法的特例； 5、提出了多用户环境下阵列响应的估计方法——CARE方法，该方法对信号结构和传播参数（主要是散射源分布与角度散布）的约束较少，适用于各种几何结构的阵列甚至未校准的阵列，能够直接得到阵列响应的闭式解，因此计算量小、稳健性好，不存在收敛问题； 6、提出了针对多用户下行选择性发送的阵列等效激励模型、优化设计方法及其系统实现方案，通过空间场的相干叠加与非相干叠加使得单一阵列能够形成多个波束，并保证各波束内的用户信号各不相同且相互干扰最小；其系统方案具有在基带实现数字波束成形、信道分配并便于软件无线电实现的特点，其有效性已得到外场实测数据的证实。

The digital I/Os are galvanically isolated; the signals are connected through a D-sub connector.

数字I/O是偶合孤立的，信号通过一个D-sub连接器进行连接。

The glottal flow derivative is estimated by using an inverse filtering technique which obtained from the vocal tract system which is established by large database of x-ray pictures and simulated by digital signal processing multiplies the frequency domain value of the original speech signals.

声门来源波型的取得是利用大量X光为基础而以数位讯号方式模拟人体口腔模型而将所需要的反函数求出再将之与原语音的频谱图做相乘而得之。

A digital phase synthesizer is composed of a continuous phase data signal source, an interpolater to generate continuous edge configuration data signals in response with each continuous phase data signal, and a phase modulator to generate ouput clock signal.

一种数字相位合成器包括一个连续相位数据信号源。一个内插器响应每个连续相位数据信号产生连续边沿配置数据信号。一个相位调制器产生具有放置在由连续边沿放置数据信号确定的时间的边沿的输出时钟信号。

The digital spectra and SNR of nonuniformly sampled signals is analyzed by utilizing Fourier transform technique.

利用付氏变换的分析方法对这类非均匀取样信号的数字谱结构及信噪比进行了分析。

A flashing laser at one end fires digital on/off signals along the fiber.At about 120,000 miles a second-more than half the speel of light-they zip to the other end.

在玻璃纤维的一端，一个不停闪动的激光发生装置不断发出数字式闪断信号，这些信号以大约每秒12万英里的速度——超过了1/2光速——飞快地传输到另一端。

Alternatively, a concatenated coding scheme can be used to transmit digital communication signals.

按另一种方式，可以将一个链接编码方案用于发送数字通信信号。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。