Multichannel Audio Tools

(This is not an official Google product!)

Multichannel Audio Tools contains common signal processing building blocks, vectorized for multichannel processing using Eigen.

A non-exhaustive list of libraries in this repo:

• biquad filters
• ladder filters (with time-varying coefficients and enforced stability)
• filter design libraries
  • lowpass, highpass, etc.
  • 2 way crossover, N-way crossover
  • auditory cascade filterbank
  • parametric equalizer
  • perceptual loudness filters for implementing ITU standards
• dynamic range control
  • compression
  • limiter
  • noise gate
  • expanders
  • multiband dynamic range control
• envelope detectors
• gmock matchers for vector/Eigen types
• some other single-channel tools:
  • a fast rational factor resampler
  • spectrograms
  • a mel-frequency cepstral coefficient calculator

Contact [email protected] with questions/issues.

This library is intended to be built with Bazel. See command below regarding running tests and building with the proper flags.

bazel test -c opt --cxxopt="-fext-numeric-literals" \
                  --cxxopt="-Wno-sign-compare" \
                  --cxxopt="-fpermissive" \
                  --cxxopt="-std=c++11" \
                  audio/... \