Peter

Actif depuis 2011

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Question

Speed up FIR filter
Hi, I have to filter large amount of data with a FIR filter. My code works, but is rather slow. Is there a trick to speed it up...

environ 8 ans il y a | 1 réponse | 0

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réponse

Question

How to define the number of wavelet cycles?
Dear all, the number of wavelet cycles is supposed to influence the wavelet convolution. However, given a center frequency, a b...

presque 10 ans il y a | 1 réponse | 0

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Question

Cycles of complex morlet wavelet transform
Dear all, I'm using the complex morlet wavelet transform cmor2-1. Is there a way to determine the numbers of wavelet cycles use...

presque 10 ans il y a | 1 réponse | 0

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Question

Analyze a variable number of datas
Dear all, I have a changing number of data to be analyzed. How can I do it the smart way without an if condition (copy and past...

environ 10 ans il y a | 1 réponse | 0

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Question

Tradeoff Sampling rate / bandpass filter design
Dear all, I'm usually sampling my data with 20 kHz and want to filter the data with a butterworth filter. My question: if I fil...

plus de 10 ans il y a | 1 réponse | 0

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Question

Optimze code with repetive variable numbering
I use the ui way to generate my graphical user interfaces (suppose to analyze 1 up to 5 traces, depending on the input). There ...

plus de 10 ans il y a | 1 réponse | 0

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Question

Elegant way to obtain the values of multiple button selection?
My ui has 15 radio buttons and a couple of potentials values that can be selected by the users. The buttons are systematically n...

plus de 10 ans il y a | 1 réponse | 0

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Question

filtfilt and filter order
I use a butterworth filter with the filtfilt function. How does the reverse filtering affect the total filter order? If I use a ...

plus de 10 ans il y a | 2 réponses | 0

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Question

Template search on time series data
Dear all, I want to perform a template search on time series data (recorded data with variable y-values over the time values (x...

presque 12 ans il y a | 1 réponse | 0

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Question

iirnotch filter and q-factor
Dear all, I'm using an iirnotch or iircomb filter to remove 60Hz from my recorded signal. Following matlab help it is easy to i...

plus de 12 ans il y a | 1 réponse | 0

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Question

Print option does not save the figure correctly
Dear all, I use a simple code line print -depsc -tiff -r300 picture to print the current figure as picture.eps. But...

plus de 12 ans il y a | 1 réponse | 0

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Réponse apportée
Right filter syntax for the [z,p,k] syntax
Thanks for the advice. Could you give me a code snippet for the reverse filterung using filter (unfortunately I can't use the fi...

plus de 12 ans il y a | 0

Question

Right filter syntax for the [z,p,k] syntax
Hi, I used the butterworth filter with the [b,a] syntax: filtord=4; SampleRate=20000; d = fdesign.bandpass('...

plus de 12 ans il y a | 2 réponses | 0

2

réponses

Question

Wavelet display problem - marked difference in frequency content between 'contour' and 'imagec'
Dear all, I analyze a test signal containing two sinus waves of 100Hz and 300 Hz with an wavelet transformation (code attachte...

plus de 12 ans il y a | 1 réponse | 0

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Question

What is the difference between the complex morlet waveform and the morlet wavelet transformation (cwt)?
Hi, thats my question: What is the difference between the complex morlet waveform and the morlet wavelet transformation (cwt)? ...

plus de 12 ans il y a | 3 réponses | 1

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réponses

Question

Proper wavelet scaling / restricted frequency analysis
Dear all, I sample a signal with 20000 Hz and I'm using e.g. the morlet wavelet to analyze the frequency content of short time...

plus de 12 ans il y a | 1 réponse | 0

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Réponse apportée
Power scaling with spectrogram
Thanks - here is my piece of code with a test noise representing my signal in mV. I'm interested in the frequency range between ...

plus de 12 ans il y a | 0

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Réponse apportée
Power scaling with spectrogram
Well, not exactly. Of course I have a colorbar displaying the range from 0 to 19*10(-4). But what does this mean (µV²/ Hz or som...

plus de 12 ans il y a | 0

Question

Power scaling with spectrogram
Dear all, I'm processsing a voltage trace (mV) with spectrogram (trace of a couple of minutes, hamming window 1 s, 0.5 s noverl...

plus de 12 ans il y a | 3 réponses | 0

3

réponses

Question

Does the fft automatically use a dft algorithm?
Hello everybody, Matlab has only the fft command. The fft algorithm is based on a signal of power of 2. If your signal length d...

environ 14 ans il y a | 2 réponses | 0

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Question

FFT Spectrum or Welch Spectrum
Hello everybody, I wrote a windowing function with an average of FFt's and calculated the same with the Matlab function pwelch....

environ 14 ans il y a | 2 réponses | 0

2

réponses