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Recent content by LinuxGuy

  1. L

    Low-pass causal filter with no time domain lag?

    But is there a better filter for my purpose -- more smoothing with less lag? A simple FIR filter is all that comes to mind.
  2. L

    Low-pass causal filter with no time domain lag?

    I am a trader and I am trying to develop smoother technical indicators than what I currently have (exponential moving average). Maybe the best approach would be a dynamic ema of the form: y[n] = x[n]*alpha + y[n-1](1-alpha) where alpha varies based on some parameter of the signal -- dominant...
  3. L

    Low-pass causal filter with no time domain lag?

    But the allpass filter does not actually do any stopband attenuation, does it? I don't need an ideal stopband transition (small as possible) or even high stopband attenuation. However, I would like some attenuation of higher frequencies, otherwise, no need to filter.
  4. L

    Any other good signal processing forums?

    When it comes to signals, ridicule does not phase me :-). Thanks!
  5. L

    Low-pass causal filter with no time domain lag?

    Perfect! Where did you learn of these filters? Can you recommend a good book? Thanks!
  6. L

    Any other good signal processing forums?

    Ok then, what's the second best forum?
  7. L

    Low-pass causal filter with no time domain lag?

    I thought about using positive feedback applied to a low-pass filter. The idea is that the gain on the positive feedback path is proportional to the actual filter output minus the input (gain proportional to error). This would allow the circuit to respond to large changes in input in...
  8. L

    Any other good signal processing forums?

    EDA's really great, but does anyone know of any other signal processing forums?
  9. L

    Low-pass causal filter with no time domain lag?

    Maybe a better question would be: can someone explain to me how to design a low-pass filter that has low-frequency phase as close as possible to zero? I am trying to smooth data in real-time.
  10. L

    Low-pass causal filter with no time domain lag?

    I want to build a low-pass filter that has no or very minimal lag in time domain (in other words, I want to use it for data smoothing, responsive to big changes in the data, but still good at filtering out noise). In order to do this, I think it's a requirement that the filter has 0 phase. I...

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