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3 votes

System instability when using FIR filter in feedback loop for removing targets in FMCW radar return

FIR filters are typically a bad idea to include in the feedback of a control loop, unless the system is significantly oversampled such that the delay of the filter is insignificant. If an additional ...
Dan Boschen's user avatar
  • 52.8k
2 votes
Accepted

Running average works with DF-I but not with DF-II

My best guess is that DF-II assumes time-invariance... is this guess correct? Yes. The filter you are implemented is time variant and hence is NOT an LTI (linear time invariant) system. The different ...
Hilmar's user avatar
  • 46.3k
1 vote
Accepted

Can a physical system/ filter be minimum phase?

Yes and no. That's a bit of a philosophical question: all mathematical models we make of the physical world are approximate in nature. You choose the model that's a good balance between complexity and ...
Hilmar's user avatar
  • 46.3k
1 vote

How to apply FFT on audio in chunks without introducing distortion?

I have always tried to avoid Java primarily because of the JVM and definitely for signal processing applications. FFTW is the fastest non-GPU FFT library I know of, but you'll have to rewrite your ...
Michael Blazej's user avatar
1 vote

System instability when using FIR filter in feedback loop for removing targets in FMCW radar return

As I proposed in the comments, implementing a sensitivity-time-control (STC) scheme might suit you better if your hardware can handle it. Let's assume two identical targets at different ranges. We ...
Envidia's user avatar
  • 2,631
1 vote

How do I generate invertible causal filters with stable deconvolution?

Minimum phase filters are causal and stable and their inverse is also minimum phase, causal and stable. Note that this in general will be IIR filters. You can certainly design minimum phase FIR ...
Hilmar's user avatar
  • 46.3k
1 vote

Why Does This Sliding Window Goertzel Filter Trick Work?

Fundamentally, I'd justify it using the superposition principle. One way to conceptually think about it is that it is computing the difference between two first stage filters, one of which is delayed ...
Stephen's user avatar
  • 1,118
1 vote

Oversampling and decimation leads to slightly different result in frequency domain

There are two aspects that need to be corrected: (1) upsampling in the frequency domain, which needs to be done in consideration of the fft frequencies and scaling; and (2) you must not low pass ...
Stephen's user avatar
  • 1,118
1 vote

Oversampling and decimation leads to slightly different result in frequency domain

Oversampling and decimation leads to slightly different result in frequency domain Which is expected. As long as decimation involves low-pass filtering, the low-pass filter will change the signals to ...
Hilmar's user avatar
  • 46.3k
1 vote
Accepted

Apply Walsh Hadamard Transform (WHT) on Image Patches of Odd Size

The relevant section in the paper is given by: They use the method in the paper (Which is referenced as [6]): Computing Nearest Neighbor Fields via Propagation ...
Royi's user avatar
  • 20.1k

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