/usr/share/jconvolver/config-files/ambisonic/uhjdec.conf is in jconvolver-config-files 0.9.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (C) 2008-2011 Fons Adriaensen <fons@linuxaudio.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
# -----------------------------------------------------------------------------
#
#
# jconvolver configuration
# ------------------------
#
# UHJ decoder using 4096 sample Hilbert transform IR and Dirac pulses.
# This is the matrix:
#
# | L R
#-----------------------------------------------
# W | 0.491 + 0.082j 0.491 - 0.082j
# X | 0.210 - 0.414j 0.210 + 0.414j
# Y | 0.382 + 0.193j -0.382 + 0.193j
#
#
# in out partition maxsize density
# -------------------------------------------------------
/convolver/new 2 3 256 4096 1.0
#
#
# num port name connect to
# -----------------------------------------------
/input/name 1 In.L
/input/name 2 In.R
#
/output/name 1 Out.W
/output/name 2 Out.X
/output/name 3 Out.Y
#
#
# in out gain delay length
# -----------------------------------------------------
# L -> W
/impulse/dirac 1 1 0.491 2048
/impulse/hilbert 1 1 0.082 2048 4096
# R -> W
/impulse/dirac 2 1 0.491 2048
/impulse/hilbert 2 1 -0.082 2048 4096
# L -> X
/impulse/dirac 1 2 0.210 2048
/impulse/hilbert 1 2 -0.414 2048 4096
# R -> X
/impulse/dirac 2 2 0.210 2048
/impulse/hilbert 2 2 0.414 2048 4096
# L -> Y
/impulse/dirac 1 3 0.382 2048
/impulse/hilbert 1 3 0.193 2048 4096
# R -> Y
/impulse/dirac 2 3 -0.382 2048
/impulse/hilbert 2 3 0.193 2048 4096
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