Questions tagged [online-processing]
The online-processing tag has no usage guidance.
13 questions
2
votes
3
answers
209
views
Clipping detection algorithm for a sinusoidal signal with noise and unknown amplitude in an online fashion
My problem is the following:
I am sampling data from a sine signal
Samples come in a online fashion (more and more data incoming through time).
The device does not have a lot of memory so it is ...
- 21
0
votes
1
answer
77
views
Online algorithm to detect non-directional volatility?
I'm trying to write an online algorithm to detect when a time series goes sideways (i.e., its mean trend or mean drift is approximately zero) but is also unusually volatile. For example, in the red ...
- 163
2
votes
3
answers
223
views
Algorithm to detect down-up-down pattern in time series
I'm trying to write an online algorithm in Python to detect this below Down-Up-Down pattern in time-series.
It's not hard to do roughly if I calculate 3 contiguous non-overlapping moving averages, and ...
- 163
0
votes
1
answer
80
views
Questionable results of on-line butterworth bandpass filtering using scipy.signal.lfilter
I have a data_stream that I'm attempting to filter using two on-line butterworth bandpass filters to extract two frequency bands of interest. The original ...
1
vote
1
answer
137
views
Are there any recursive online max/min filters for time-series
Are there any online recursive filters that can approximate local, time-varying minimum and maximum values of a time series?
- 163
0
votes
0
answers
192
views
Non Linear Recursive / Online Least Squares
I am searching for a recursive or online non linear least squares algorithm. I want to spread the computation out as new data is sampled like in the linear Recursive Least Squares or the LMS.
...
- 1
3
votes
2
answers
3k
views
Online DFT Algorithm
I have a discrete audio stream $x$ that needs to be processed in real-time. Specifically, as the each new sample is received, I would like to compute a Fourier transform of the last $n$ samples of the ...
- 185
0
votes
0
answers
72
views
Optimize online weighted kurtosis algorithm
I am currently working on a Simulink block designed to perform an online computation of the weighted kurtosis typical of a certain signal. This block is part of a larger control algorithm, which will ...
- 627
3
votes
2
answers
699
views
detect and distinguish driving maneuvers via smartphone sensors
I want to do some driving style analysis via smartphone.
Therefore, I programmed an app that records a 2D acceleration (when accelerating/braking and turning left/right). The app calibrates itself in ...
- 131
9
votes
2
answers
18k
views
Filtering a digital signal online in real-time using python
I am currently trying to apply a bandpass filter to a signal in real-time. There are samples coming in with a constant sampling rate and i would like to calculate the corresponding bandpass filtered ...
- 207
2
votes
0
answers
485
views
Web Online tools for feature detection methods in image processing
I'm doing a research about image processing, I would like to access common feature detection methods online, ex:
Blob detection: Laplacian of Gaussian (LoG), Difference of Gaussians (DoG), ...
- 131
2
votes
0
answers
306
views
Estimate process error for Kalman filter on financial data
I'd like to apply a Kalman filter, using Octave, to financial data but due to the nature of the data it will be difficult to impossible to specific the process error in advance of applying the filter. ...
- 507
9
votes
4
answers
6k
views
Is real-time signal processing possible under Windows?
This question is related to on How to decide what platform is best to implement real-time audio processing on?, but focusing on Windows.
I'd like to be able to take input from a data acquisition ...
- 1,994