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Peter


Active since 2011

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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...

7 years ago | 1 answer | 0

1

answer

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...

9 years ago | 0 answers | 0

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answers

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...

9 years ago | 0 answers | 0

0

answers

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...

9 years ago | 1 answer | 0

1

answer

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...

9 years ago | 1 answer | 0

1

answer

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 ...

9 years ago | 1 answer | 0

1

answer

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...

9 years ago | 1 answer | 0

1

answer

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 ...

9 years ago | 2 answers | 0

2

answers

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...

11 years ago | 0 answers | 0

0

answers

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...

11 years ago | 1 answer | 0

1

answer

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...

11 years ago | 1 answer | 0

1

answer

Answered
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...

11 years ago | 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('...

11 years ago | 2 answers | 0

2

answers

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...

11 years ago | 1 answer | 0

1

answer

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)? ...

11 years ago | 3 answers | 1

3

answers

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...

11 years ago | 1 answer | 0

1

answer

Answered
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 ...

11 years ago | 0

| accepted

Answered
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...

11 years ago | 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...

11 years ago | 3 answers | 0

3

answers

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...

13 years ago | 2 answers | 0

2

answers

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....

13 years ago | 2 answers | 0

2

answers