数字信号

Experimental results show that the two schemes can preserve inaudibility and they are robust enough to against the different signal processing operations. In addition, very large watermarking information can be embedded into the original audio signal. Furthermore, it can resist the cropping and MP3 compression attacks.

仿真实验结果表明，两种算法都具有较强的鲁棒性和不可感知性，水印嵌入容量大，提取水印时不需要原始音频信号的参与，并且对裁剪、时间伸缩等攻击具有较强的稳健性，是可行的数字音频水印算法。

The experimental results show the two practical algorithms can preserve inaudibility and they are robust enough to against the different signal processing operations. In addition, the watermarking information can be embedded into the original audio signal adaptively, which also doesnt require the use of the original audio signal for detection. Furthermore, it can resist the different attacks, such as lossy compression (MP3), filtering, resampling and requantizing, etc.

仿真实验结果表明，两种方法都具有较强的鲁棒性和不可感知性，水印嵌入容量的自适应性，提取水印时不需要原始音频信号的参与，且对包括MP3有损压缩、低通滤波、重采样/重量化等多种攻击性试验具有较强的稳健性，是可行的数字音频水印算法。

The system uses temperature and humidity sensor SHT11 and smoke sensor MQ-N5 to collect data. SHT11 is a digital sensor with highly integrated inner system and anti-jamming capacity, which makes the collected signal more precise. The integrated I2C bus interface is a sensor, which can directly connect with any type of microprocessor and microcontroller system, it is very simple and practical.

本系统采用温湿度传感器SHT11和烟雾传感器MQ-N5来采集数据，SHT11是个数字传感器，内部高度集成，抗干扰性能，使采集的信号更准确，集成的I2C总线接口能是传感器可直接通过I2C总线与任何类型的微处理器、微控制器系统连接，十分简单实用。

It can provide effective protection for digital media forgery, authentication, security and intactness by embedding a special mark into multimedia data.

数字水印技术主要通过在媒体信息中嵌入标记信号，为媒体信息在防伪、防篡改、认证、保障数据安全和完整性等方面提供有效的技术手段。

Our handheld digital refractometer is programmed with the External Light Interference function to display a warning message,"nnn", when intense direct light is detected.

我们的手持式数字折射仪编程与外部光干扰函数来显示一个警告信号"，次近邻"，在激烈的直接光检测。

Besides, when digital system is employed, the huge relative bandwidth signal can be generated on intermediate frequency.

此外，数字方法还可以在中频上产生出相对带宽很大的信号。

The paper introduces the PLC control system in which intermediate value strain in average wave handling is carried out to simulated signal.

文章介绍了PLC控制系统中对模拟信号进行中值平均滤波处理，并给出了一种数字滤波程序的设计方法。

Proposed a representation scheme for 3D face -- Surface UnfoldingFor its irregular sampling in 3D space, 3D face surface cannot be processed by many orthogonal and subspace analysis toolkits directly, i.e. DFT, DCT, PCA, LCA. Surface Unfolding projects the 3D face to a 2D plane while retaining its intrinsic geometry properties of angle and area which issues a surface representation — Unfolded Image.

提出了一个三维人脸的平面表征方法——曲面开折模型不同于传统的数字生物特征，3D人脸数据是非规则采样的，传统的信号处理工具难以对3D数据进行直接处理。

In the AC servo control system, using digital low-pass filter can restrain current feedback noise and improve the resolving power of speed feedback, but it may lead to phase lag of feedback signal and directly influence the response speed.

交流伺服控制中采用数字低通滤波可以抑制电流反馈噪声，提高速度反馈分辨率，但同时会带来反馈信号的相位滞后，将直接影响响应速度。

In this paper,a new identification technique which uses cyclic pulse signals with different amplitudes as input signals to identify the unknown parameters of nonlinear gain and pulse responses of linear subsystem of wiener system with known structure,is presented,and estimates obtained are strong consistency.

本文针对带有已知结构的非线性Wiener系统，提出了利用不同幅值的周期脉冲信号辨识非线性增益未知参数和脉冲响应序列的新方法，获得了强一致性估计，数字仿真研究说明了该方法的有效性和实用性。

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。