Description: 这是在matlab下实现的包络检波算法。先对信号进行调制，然后进行包络检波。-This is achieved under matlab envelope detection algorithm. First signal modulation, and then proceed to the envelope detector. Platform: |
Size: 26624 |
Author:刘天宇 |
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Description: 小学期的源程序
1．试编MATLAB程序。信号 sinc(10*t),-2<=t<=2
m(t)=
0,其它
用100hz的载波来产DSB信号并解调。完成下列工作：
画出已调信号；
求已调信号的频谱，并用图像表示。
画出解调信号；
求解调信号的频谱，并用图像表示。
2．信号
sinc2(100t),|t|≤t0
m(t)=
0, 其它
采用频率调制调制为1000HZ的载波。频偏常数为kf=50,t0=0.2。
注：（求和代替积分）
3．信号
2, t0/3>t>0
m(t)= -6, t0/3<=t<2*t0/3
0, 其它
t0=0.15,使用AM调制和包络检波解调.-Primary phase of source 1. Test procedures for MATLAB. Signal sinc (10* t),-2 < = t < = 2 m (t) = 0, the other with the 100hz signal carrier to the middle class and DSB demodulation. To complete the following tasks: Draw has been transferred signal for the spectrum signals have been adjusted, and image representation. Draw demodulation signal solving transfer spectrum signal, and image representation. 2. Signal sinc2 (100t), | t | ≤ t0 m (t) = 0, the other the use of frequency modulation of the carrier modulation for 1000HZ. Offset constant kf = 50, t0 = 0.2. Note: (sum in lieu of points) 3. Signal 2, t0/3> t> 0 m (t) =-6, t0/3 < = t < 2* t0/3 0, other t0 = 0.15, the use of AM modulation and demodulation envelope detector. Platform: |
Size: 3072 |
Author:张静 |
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Description: musicdsp source code archive-Analysis
Beat Detector Class
Coefficients for Daubechies wavelets 1-38
DFT
Envelope detector
Envelope Detector class (C++)
Envelope follower with different attack and release
Fast in-place Walsh-Hadamard Transform
FFT
FFT classes in C++ and Object Pascal
Frequency response from biquad coefficients
Java FFT
Look ahead limiting
LPC analysis (autocorrelation+ Levinson-Durbin recursion)
Magnitude and phase plot of arbitrary IIR function, up to 5th order
Measuring interpollation noise
QFT and DQFT (double precision) classes
Simple peak follower
tone detection with Goertzel
Tone detection with Goertzel (x86 ASM)
Effects
2 Wave shaping things
Alien Wah
Band Limited PWM Generator
Bit quantization/reduction effect
Class for waveguide/delay effects
Compressor
Decimator
Delay time calculation for reverberation
DIRAC- Free C/C++ Library for Time and Pitch Manipulation of Audio Based on Time-Frequency Transforms
dynamic convolution
Early echo s with image-mirror techn Platform: |
Size: 826368 |
Author:Alan Tang |
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Description: 包络检波matlab下实现的包络检波算法。先对信号进行-Matlab envelope detector envelope to achieve detection algorithm. First the signal Platform: |
Size: 26624 |
Author:田改生 |
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Description: 这是在matlab下实现的包络检波算法法。先对信号进行调制，然后进行包络检波。
-This is the method of envelope detection algorithm under Matlab. First signal modulation, and then proceed to the envelope detector. Platform: |
Size: 26624 |
Author:防止 |
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Description: 4FSK调制解调的matlab代码。采用相干解调的方式4FSK进行解调，与大多数方案的包络检波不同。基带信号用四种电平来表示，与调制信号相区分。-Demodulation matlab code 4FSK modulation. Coherent demodulation 4FSK demodulates Unlike most programs envelope detector,. The baseband signal is represented with four level distinguish phase with the modulation signal. Platform: |
Size: 6144 |
Author:胡佳 |
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Description: 一些关于morlet wavelet的文章，分别是用Morlet小波进行包络检波分析，基于小波分析的进化谱及在故障诊断中的应用-Morlet wavelet is Morlet wavelet analysis of the envelope detector, based on the wavelet analysis of the evolutionary spectrum and its application in fault diagnosis Platform: |
Size: 2197504 |
Author:玛雅 |
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Description: 核磁共振（NMR）技术探测地下水是目前唯一的直接找水的地球物理方法。与传统的地球物理方法相比具有高分辨力，高效率，信息量丰富和解唯一性等优点。利用核磁共振地下水探测系统可以高效率地进行区域水文地质调查，确定找水远景区，圈定地下水在三维空间内的分布，进而可靠地选定水井位置等。但是由于水中氢核产生的核磁共振信号的幅度小（纳伏级），要求探测系统的灵敏度高，将引入大量的自然和人为噪声，导致采集信号的信噪比低，解释结果不清楚。
本文用LMS自适应算法提高MRS信号的信噪比，用Hilbert变换提取MRS信号的包络信号，用线性拟合提取水文地质参数并通过仿真实验结果，验证了本文提出的数据处理方法的有效性和准确性。
-Nuclear magnetic resonance (NMR) technique to the detection of direct water division is the only geophysical method to find water. Compared with conventional high-resolution geophysical methods, efficient, informative unique advantages of reconciliation. Groundwater exploration using nuclear magnetic resonance system can efficiently carry out the regional hydrogeological investigation to determine the prospective areas to find water, delineation of ground water distribution in three-dimensional space, and then reliably the location of the selected wells. However, because the water proton NMR signal amplitude generated by small (Na V level), requiring high sensitivity detection systems, will introduce a large number of natural and man-made noise, resulting in low signal to noise ratio acquisition, interpretation of results is not clear.
In this paper, LMS adaptive algorithm improves the MRS signal to noise ratio, with the Hilbert transform to extract the signal envelope MRS signal ext Platform: |
Size: 954368 |
Author:zhang chao |
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Description: This m-file simulates the operation of the heterodyne section and
demodulating section of a garden variety AM receiver. An array is created
that represents the superposition of three separate RF carriers, each
modulated at a different audio frequency. This is the kind of signal that
could be expected at the output of the LNA. This signal is multiplied by
a local oscillator, passed though an IF filter, and demodulated using a
simple envelope detector (half-wave rectifier and single pole LPF). Some
plots are created at the end to show the signal at various locations in
the receiver.- This m-file simulates the operation of the heterodyne section and
demodulating section of a garden variety AM receiver. An array is created
that represents the superposition of three separate RF carriers, each
modulated at a different audio frequency. This is the kind of signal that
could be expected at the output of the LNA. This signal is multiplied by
a local oscillator, passed though an IF filter, and demodulated using a
simple envelope detector (half-wave rectifier and single pole LPF). Some
plots are created at the end to show the signal at various locations in
the receiver. Platform: |
Size: 2048 |
Author:burak |
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Description: Generation of ASK:
Amplitude shift keying - ASK - in the context of digital communication is a modulation process which imparts to a sinusoid two or more discrete amplitude levels 1. These are related to the number of levels adopted by the digital message. For a binary message sequence, there are two levels one of which is typically zero. Thus the modulated waveform consists of bursts of a sinusoid.
Demodulation of ASK:
ASK signal has a well defined envelope. Thus it is amenable to demodulation by an envelope detector. Some sort of decision-making circuitry is necessary for detecting the message. The signal, which is a binary sequence is recovered by using a correlator and decision making circuitry.
Matlab Program for Frequency shift keying
program for Quadrature Amplitude Modulation
Matlab program for phase shift keying
program for Quadrature Phase shift keying-Generation of ASK:
Amplitude shift keying - ASK - in the context of digital communication is a modulation process which imparts to a sinusoid two or more discrete amplitude levels 1. These are related to the number of levels adopted by the digital message. For a binary message sequence, there are two levels one of which is typically zero. Thus the modulated waveform consists of bursts of a sinusoid.
Demodulation of ASK:
ASK signal has a well defined envelope. Thus it is amenable to demodulation by an envelope detector. Some sort of decision-making circuitry is necessary for detecting the message. The signal, which is a binary sequence is recovered by using a correlator and decision making circuitry.
Matlab Program for Frequency shift keying
program for Quadrature Amplitude Modulation
Matlab program for phase shift keying
program for Quadrature Phase shift keying
Platform: |
Size: 3072 |
Author:punitha sp |
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Search - envelope detector