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does anyone know how the "bispectrum" works?
Hello Forum, the bispectrum is a generalization of the spectrum.The PSD of a process is the Fourier transform of the autocorrelation function R(tau)=<x(t) x(t+tau)>, for a stationary process. The "triple" autocorrelation function is R(tau1, tau2)=<x(t) x(t+tau1) x(t+tau2)>. It measure the relation between three p... 7 May 2010 08:54
Kenlighten - A social network for knowledge seekers and providers
Dear friends, I am writing to share with you about a unique social knowledge network - Kenlighten . At Kenlighten you can register for a free account and create online tutorials in your area of expertise by uploading your ebooks, presentations, articles, videos, audio files. You can a... 7 May 2010 02:23
Measure similarity between two signals which have time distortion
Hi all, I am trying to compare two signals. One is original and the other has time distortion. This is an example. In the graph, the shapes of C1, C2, C3, and C4 are very similar, but C2~C4 have time distortions in x-axis. I want to compare the simi... 7 May 2010 11:07
Site for some reason, and forbidden
Site for some reason, and forbidden ... 6 May 2010 17:36
Confusing Spectrogram of a chirp signal
Hi, I'm used follwing MatLab-Code to visualize a spectogram of a linear chirp signal: n=(1:1:512); for ind=1:512; fac = 0.2*ind; S3(ind)=sin(fac*pi*ind/512); end u = specgram(S3,512,512,64,63); figure, imagesc(abs(u)); So, i think there must be frequencies between 0.1 and 51.2, but the sp... 6 May 2010 11:54
amplify frequencies
I am new to audio processing. What I wanted to do is amplify certain frequencies in my data. I have written an application in c++ with a callback function that gets the audio data to a buffer. Now I need to apply some function to this data to amplify my frequencies. Can I do this using a filter? Is there an... 8 May 2010 21:04
about dead-band used in pwm
Hello Forum, I have to do is use the 2812 to the direct torque control to control the motor,CONTROL 6 IGBTS Now I had a test, according to the requirements of force output on UP BRIDGE SWITCH SETS followed by 011, then output 001, then 101, then 111, then 110, then 010 and finally 110 Corresponding under bridg... 7 May 2010 17:49
Scaling issues with fixed point FFT
Hi, I am a student working with the Xilinx C model of the FFT. Following are my settings: Pipelined arch. (this restricts the scaling to be applied only after every pair of radix-2 butterflies) Precision of 8 bits. Twiddle precision 8 bits. FFT size 1024. If I use a conservative scaling schedule of [2,... 6 May 2010 14:14
Image compression advice
I am looking for the commonly used algorithms to compress images/ videos for transmission over the internet. could you please name me these algorithms and/or papers. Cheers ... 6 May 2010 16:29
Equivalent channel impulse response
Hi All I have a question regarding whitened matched filtered (WMF) channel model. In Proakis Comms book, the derivation is provided about this model where the transmit filter, channel, received filter, noise whitening filter and sampler can be modelled as tapped delay line and then he gives three channel implus... 5 May 2010 10:24
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