Hi, I'm a Sports Science Student, focusing on cycling performance. Part of my interest is in the power output of a cyclist during a cycling...

Hi, I'm a Sports Science Student, focusing on cycling performance. Part of my interest is in the power output of a cyclist during a cycling session and over a whole a season. For example, when looking at a 40 km time trial, the power output shows slow changes over time (known as a pacing strategy), but also fluctuations on a shorter basis. Therefore, spectral analysis seems like an interesting ...

I'm attempting to demonstrate some symmetries with real 1d and 2d signals, but finding that what I expect to happen (see Proakis' DSP book...

I'm attempting to demonstrate some symmetries with real 1d and 2d signals, but finding that what I expect to happen (see Proakis' DSP book section 7.2, or gonzalez & woods page 242) is not what I get. I've written up a simple example demonstrating the problems I'm seeing. For reference, here are the properties I'm attempting to demonstrate: Given a real-valued sequence f(x), and its D...

Hi, I'm relatively new to matlab and am wondering how to go about mapping a PCM, pulse code modulated signal(8bit resolution)eg a .wav file, to...

Hi, I'm relatively new to matlab and am wondering how to go about mapping a PCM, pulse code modulated signal(8bit resolution)eg a .wav file, to a 1 bit Pulse Width Modulated Signal in Matlab. I understand the theory behind PWM but i'm finding it quite difficult to implement this mapping in matlab. Any help/code would be very much appreciated. Thanks in advance, Colin.

Hello! I'm trying to show the effects of windowing in the frequency domain in MATLAB, but i'm rather stuck at doing so. Precisely, i've...

Hello! I'm trying to show the effects of windowing in the frequency domain in MATLAB, but i'm rather stuck at doing so. Precisely, i've problems of getting the theory (convolution H_idealfilter & H_window) to work in the "discrete world" of MATLAB. From what I understand after reading some books on this topic, I need circular convolution, am I right? (btw: anyone knows good papers/books, cod...

Hi all, I have some basic questions regarding a low-pass filter. I have never studied audio signal processing that's why my questions might...

Hi all, I have some basic questions regarding a low-pass filter. I have never studied audio signal processing that's why my questions might seem trivial for most of you. So I have to design a low-pass filter. Here is the way I do it. I have my matrix with the signals signalMatrix. I create a FFT so I do : newVector = fftsfift(fft(signalMatrix)); Here is my first question : what do I get n...

Hi, I am creating a Matlab model of a multichannel system where the input signal is sampled below the Nyquist rate in each channel, but is still...

Hi, I am creating a Matlab model of a multichannel system where the input signal is sampled below the Nyquist rate in each channel, but is still recoverable because each channel has a uniform phase offset. In this case there are M=3 channels that sample at half the Nyquist Rate (L=2). The channels have uniform phase offsets of [0 Tsamp/3 2*Tsamp/3]. When corrected and interleaved, the output sh...

Hi, I am doing a project on audio watermarking using Matlab. I am facing the following problem. I took a small subset of the samples of a...

Hi, I am doing a project on audio watermarking using Matlab. I am facing the following problem. I took a small subset of the samples of a .wav file. I embedded a small bitmap in the LSBs of the wavelet coefficients of this small set of samples and recreated a new .wav file. I wrote the file with the wavwrite function. As the next step, in order to detect the watermark, I read the wa...

Hello, I'm currently analyzing wind speed records, and it turns out that type of filter used influences the power spectrum. Does any one...

Hello, I'm currently analyzing wind speed records, and it turns out that type of filter used influences the power spectrum. Does any one know of a good first reference/book for Digital Signal Processing? I'm also looking for the filter functions for block averages as I also need to understand this for my research. Regards, Juan Antonio

Dear All, I've been receiving a lot of feed back and I would like to say thank you so much for helping me. However once I try to implement the...

Dear All, I've been receiving a lot of feed back and I would like to say thank you so much for helping me. However once I try to implement the suggested method for my real case its there's still give me an error. Hopefully u can help me with this. Let say we already know U1=[1 1 1 1 1]; T1=[0 1 0 0 0]; T2=[1 0 0 0 0]; T3=[0 0 0 0 1]; Now the problem should be U2 = U1-T1; a...

Hello all, I have a sum of cosine functions as clear all; Asim=[0.185, 0.22, 0.25, 0.33, 0.41, 0.60]; Tsim=[23.54, 45.83, 55.67, 89.54,...

Hello all, I have a sum of cosine functions as clear all; Asim=[0.185, 0.22, 0.25, 0.33, 0.41, 0.60]; Tsim=[23.54, 45.83, 55.67, 89.54, 93.02, 120.18]; phase=[2.3, 0.46, 2, 1.18, 0.86, 1.89]; p=1:8000; value=0; Cosine1=0; Cosine2=0; Cosine3=0; Cosine4=0; Cosine5=0; Cosine6=0; Cosine1=Cosine1+Asim(1)*cos(2*pi*1/Tsim(1)*p+phase(1))\'; Cosine2=Cosine2+Asim(2)*cos(2*pi*1/Tsim(2)*p+ph...