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Code to perform standard DSP functions, such as Biquads, FIRs, sample rate conversion

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xcore/sc_dsp_filters

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DSP filters

Stable release:unreleased
Status: first version
Maintainer:https://github.com/henkmuller
Description:A collection of standard DSP building blocks

Key Features

  • Generic cascaded biquad filter
  • Generator for filter values
  • Generic FIR
  • Asynchronous Sample Rate converter

To Do

  • Optimised biquad
  • Optimised FIR
  • On-the-fly computation of coefficients
  • Optional dithering

Firmware Overview

This repo intends to store a set of algorithms to perform standard DSP functions, enabling people to implement, for example, graphic equalisers or sample rate converters. At present, only a cascaded biquad and a FIR filter are implemented, together with programs to compute coefficients and response curves. Coefficients and response curves for the biquad are computed based on algorithms by Robert Bristow-Johnson.

The current FIR code is written for readability - less readable (more efficient) versions to follow. The generic versions check on overflow and saturate (intermediate) results.

Known Issues

  • Makefile should invoke biquad generator properly - currently relies on java and javac, and currently recreates files unnecessarily.

Required Repositories

Support

Issues may be submitted via the Issues tab in this github repo. Response to any issues submitted as at the discretion of the maintainer for this line.