Companion page for Converting Series Biquad Filters into Delayed Parallel Form: 
Application to Graphic Equalizers

http://research.spa.aalto.fi/publications/papers/ieee-tsp-2019-biquad/

The MATLAB files in this web folder are related to the following 
journal article:

J. Liski, B. Bank, J. O. Smith, and V. Valimaki, "Converting series biquad filters into 
delayed parallel form: Application to graphic equalizers," IEEE Transactions on Signal 
Processing, 2019.

MATLAB code for Figures 3, 4, 5, 6, 7, 8, and 9 of the above paper are included 
(Fig3.m, Figs45.m, Figs67.m, Figs89.m). These scripts can be executed separately, 
but please note that they use some of the additional MATLAB files, 
which must be made available for MATLAB.

Additional MATLAB files
- ACGE2APGE.m = series-to-parallel conversion of an octave or third-octave EQ
- freqpoles.m = pole set generation for parallel filter design (used for PGE design)
- insertsamples.m = inserts samples to input vector (used for PGE design)
- interactionMatrix2.m = function used to calculate the interaction matrix, updated 
version
- minphasen.m = calculates the transfer function of a minimum phase system (used for PGE 
design)
- pareq.m = function that can be used to create parametric EQ filters according to 
S. Orfanidis, Introduction to Signal Processing, p. 594.
- parfiltdesfr_precomp.m = direct design of second-order parallel filters for a given pole 
set in the frequency domain (used for PGE design)
- parfiltfresp.m. = frequency response of second-order parallel filters (used for PGE 
design)

In Espoo, Finland, 6 May 2019

Juho Liski

Aalto University, Dept. of Signal Processing and Acoustics

(end of file)