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

• xcommon git\@github.com:xcore/xcommon.git

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.