1) Frequency logarithmic mod-ulation signal
对数频调信号
2) FM signal
调频信号
1.
A demodulation method for narrowband multi-tone FM signal based on high-pass FIR filter in new type digitally coded track circuit system is proposed.
针对新型数字编码轨道电路传输的窄带多音调频信号,提出利用FIR高通数字滤波器进行多音调频信号数字解调的方法。
2.
By using moving one period sine wave model, the precise demodulation of FM signal wave is achieved.
在此基础上讨论实现正弦载波的调频信号的精确解调问题。
3.
The received FM signal is first downconverted to baseband using digital quadrature carriers generated by DDS.
本文提出了一种对调频信号进行数字解调的方法。
3) frequency modulated signal
调频信号
1.
Stochastic resonance of frequency modulated signals in a linear model of single-mode laser;
调频信号的单模激光线性模型随机共振
2.
(Theoretically),cyclic autocorrelation function of frequency modulated signal is deduced.
运用循环平稳分析理论,推导调频信号的循环自相关函数结果,并从理论上推导和分析了运用平方解调(或广义检波滤波解调)的方法实现对循环自相关函数的低频切片函数和高频切片函数进行解调的原理和方法,仿真验证理论推导正确,解调效果很好。
4) FM signals
调频信号
1.
This paper introduces the conception of cyclostationary signals and makes a detailed analysis of the cyclostationary properties of AM & FM signals in theory.
介绍了循环平稳信号的基本概念 ,对调幅和调频信号的循环平稳特性进行了详细的理论分析 ,计算机仿真实验也验证了分析得到的结果 ,即在一定条件下 ,调幅调频信号具有一阶和二阶循环平稳特性。
2.
In this paper,the chaotic FM signals are chose to be radar transmitted signals, the SAR imaging equation is obtained using time domain correlation technology.
提出了一种基于直接数字合成(DDS)技术的混沌调频信号生成方案,并将其用于合成孔径雷达(SAR)成像中。
5) frequency modulation signal
调频信号
1.
An adaptive algorithm for enhancement of multifold frequency modulation signals;
一种增强多种调频信号的自适应新算法
补充资料：超声信号的对数压缩
超声信号的对数压缩
超声学术语。对数压缩系输出信号电压与输入信号电压的对数函数成比例的一种传输特性。实际的超声诊断仪中，为了均衡镜面反射和漫反射之间的信号差异，对数压缩级只对强信号实施对数压缩，对弱信号则保持线性响应，而且响应的特征也是近似的。电路上多用非线性限幅，多级并联相加型的程式来逼近对数特征。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条