To increase signal-to-noise ratio(SNR) of medical ultrasound image,a frequency-modulated(FM) ultrasound transmitted imaging method is developed,where a weighted linear FM ultrasound is transmitted to enhance the emission energy without increasing the emission ultrasound pressure,and the image signal is formed by the demodulated ultrasound.
为了提高医学超声图像的信号噪声比,研究了调频超声发射的成像方法。
The simulation results show that the signal to noise ratio appear to be the primarily consideration of the limit coding width.
仿真计算表明,信号噪声比是决定极限编码宽度的主要因素。
signal to noise and distortion ratio
信号对噪声和失真比
SINAD (Signal to Noise and Distortion Ratio)
信号-噪声及失真比
Signal to Noise Ratio( SNR): The ratio of the signal to the random noise in a set of data.
信噪比：平均到一个数据单元的信号与随机噪声的比值。
Change of SNR While Signal and Noise Are Passing Through Linear Working System Equipment
信号、噪声通过线性工作系统设备过程中信噪比的变化
Noise is usually measured in volts relative to the generated signal.
噪声通常以其与正常信号的伏特比来标定其大
Studying on De-noising of Signal Based on Wavelet Transform;
超声信号在不同阈值下小波去噪结果的比较
An Improved Signal-to-Leakage-and-Noise Ratio Multi-User Precoding Algorithm
一种改进的信号泄露噪声比多用户预编码算法
noise equivalent
噪声的等值信号，噪声当量
Detection of Low Noise & Weak Signals
低噪声与弱信号检测
A Carrier Frequency Estimation Method of Non-cooperative Underwater Acoustic Direct-Sequence Spread-Spectrum Signal Under Low-CNR
非合作水声低载噪比直接序列扩频信号的载频估计方法
Maximum Signal-to-Interference-and-Noise-Ratio Combiner for Wireless Regenerative Relaying Systems
基于最大信号干扰噪声比的无线再生中继系统合并方案
The Effects of Amplitude Modulated Signal on the Signal-to-Noise Ratio of Saturation Laser Model with Correlated Real and Imaginary Parts of Quantum Noise
调幅信号对具有量子噪声实虚部关联的饱和激光模型信噪比的影响
4. Noise margin: The term noise refers to any undesirable signal that is superimposed on a generated signal.
4．噪声极限：噪声这个概念指任何正常信号之外不需要的信号。
A new signal reconnaissance method based on channel color noise suppressing
基于信道色噪声抑制的信号搜索方法
Algorithms for Modulation Recognition of Digital Communication Signals at Low SNR
低信噪比数字通信信号识别算法研究
Research on Suppression of the Atmospheric Noise and Environmental Noise in the Signal of the Laser Listening System;
激光侦听信号中大气噪声与环境噪声的降噪研究
The periodic oscillators at critical state are immune to noise and have sensitive dependence on weak sine signals or phase-coded signals at the same time.
临界混沌状态的周期振子对噪声具有免疫力,而对微弱的正弦信号或相位编码信号比较敏感。