131 reputation
3
bio website bjornroche.com
location New York, United States
age
visits member for 1 year, 11 months
seen May 2 at 22:41

I write audio and video software. I like to work in Java, C and C++, but whatever works. Someday maybe we'll just do everything in javascript.

Currently I'm working on Xonami: www.xonami.com

I can be reached at bjornroche.com


May
2
comment Wavelet or FFT for Transient signal analysis?
I'm not sure you would have a nice, closed form solution like you have here with wavelets. Is there some specific problem with your current method that you are trying to address other than wanting something better in some vague transient sense?
Jan
23
awarded  Commentator
Jan
23
comment Bandpass filter with Fourier and inverse.
I would follow the instructions from the basic audio eqs link. You want to create a low-pass filter with a cutoff of 3Hz. You can use the FFT you did above to check your results.
Jan
23
comment Bandpass filter with Fourier and inverse.
You can filter in the time or frequency domain. Judging by the posts around here people tend to try to filter in the frequency domain first because that makes intuitive sense, but The time domain is generally better approach.
Jan
20
answered Bandpass filter with Fourier and inverse.
Aug
5
comment Adjustable Sigmoid Curve (S-Curve) from (0,0) to (1,1)
Both plots you link use .5*5sin(10x/pi), for g(x), which is not correct even for x<.5
Aug
5
answered Adjustable Sigmoid Curve (S-Curve) from (0,0) to (1,1)
Jun
17
comment Using FFT in matlab
If a question is mathematical, this is a fine place for MatLab questions as far as I know. This particular question might also fit well (better?) on dsp.stackexchange.com.
Apr
26
comment Is the convolution an invertible operation?
Just a note about the practical implications: the process known as deconvolution exists and tends to be sensitive to noise unless special care is taken and something is known about the signal and/or noise.
Feb
27
comment Relationship between DFT index values, frequency in a Fourier series and Hz.
This explanation with code may help you: blog.bjornroche.com/2012/07/…
Dec
2
answered Removing noise when the signal is not smooth
Dec
2
comment Removing noise when the signal is not smooth
I think this is a signal processing problem first and then a statistics question.
Nov
3
comment Wavelet Transforms
I don't really know the answer to your question, but I can say that non-uniform sampling methods are pretty specialized. Chapter 13 of numerical recipes has a brief subsection on it, which might be worth reading (newer editions also talk about wavelets.)
Aug
6
awarded  Teacher
Aug
3
awarded  Supporter
Aug
3
comment Integration of sawtooth, square and triangle wave functions
great answer! Upvoted.
Aug
2
answered Integration of sawtooth, square and triangle wave functions