Paul Lovell Blog on DSPRelated.com https://www.dsprelated.com/blogs-1/nf/Paul_Lovell.php Paul Lovell Blog on DSPRelated.com https://www.dsprelated.com/blogs-1/nf/Paul_Lovell.php https://d23s79tivgl8me.cloudfront.net/user/profilepictures/60883.jpg en-US Sun, 12 Jul 2026 09:48:00 +0000 1783849680 Update to a Narrow Bandpass Filter in Octave or Matlab https://www.dsprelated.com/showarticle/1397.php Following my earlier blog post (June 2020) featuring a Narrow Bandpass Filter, I’ve had some useful feedback and suggestions. This has inspired me to come up with an updated version, incorporating the following changes compared to the earlier one :

  • Simpler code in Octave or Matlab
  • Float32 precision replaces float64
  • Faster processing by a factor of at least 4 times
  • Easier...]]> Mon, 29 Mar 2021 16:01:24 +0000 Paul Lovell A Narrow Bandpass Filter in Octave or Matlab https://www.dsprelated.com/showarticle/1354.php The design of a very narrow bandpass FIR filter, coded in either Octave or Matlab, can prove challenging if a computationally-efficient  filter is required. This is especially true if the sampling rate is high relative to the filter's center frequency. The most obvious filter design methods, using either window-based or Remez ( Parks-McClellan ) functions, can easily result in filters...]]> Mon, 01 Jun 2020 21:37:50 +0000 Paul Lovell An Efficient Lowpass Filter in Octave https://www.dsprelated.com/showarticle/1304.php This article describes an efficient linear-phase lowpass FIR filter, coded using the Octave programming language. The intention is to focus on the implementation in software, but references are provided for those who wish to undertake further study of interpolated FIR filters [1]- [3].

    The input signal is processed as a vector of samples (eg from a .wav file), which are converted to a matrix...]]> Wed, 06 Nov 2019 16:15:28 +0000 Paul Lovell