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Institute of Technical Acoustics (ITA)
toolbox
Commits
805b73c5
Commit
805b73c5
authored
Jan 22, 2018
by
Michael Kohnen
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starting ctc implementation
parent
1070c979
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applications/SpatialAudio/ita_3da_ctcFilter_regularized.m
applications/SpatialAudio/ita_3da_ctcFilter_regularized.m
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applications/SpatialAudio/ita_3da_ctcFilter_regularized.m
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805b73c5
function
[
varargout
]
=
ita_3da_ctcFilter_regularized
(
varargin
)
%ITA_3DA_CTCFILTER_REGULARIZED Generates a set of CTC Filter for a
%loudspeaker system with an arbitrary number of loudspeaker.
% The first input has to be a set of HRTF for each loudspeaker as
% multi-instance of itaAudio: [LS1_HRTF LS2_HRTF ... LSN_HRTF]
% or as one itaAudio containing:
% ch(1) = LS1 Left Ear
% ch(2) = LS1 Right Ear
% ch(3) = LS2 Left Ear
% ch(4) = LS2 Right Ear
% ch(5) = LS3 Left Ear
% ...
%
% The calculation algorithm is a simple inversion. Pre- and
% Postprocessing options can be found below
%
% For smoothing of HRTF or CTC filters use the functions provided by
% ita_3da_smoothing
%% Options
opts
.
beta
=
0.001
;
% regularization parameter
opts
.
delay
=
400
;
% required delay to allow for causal filter
opts
.
threshold
=
20
;
% threshold for ita_start_IR()
opts
.
useStartIr
=
false
;
opts
.
filterlength
=
-
1
;
%% Init
hrtf
=
varargin
(
1
);
H
=
merge
(
hrtf
);
if
~
isa
(
hrtf
,
'itaAudio'
)
error
(
'First input (HRTF) has to be itaAudio'
)
end
if
(
H
.
nChannels
<
4
)
error
(
'At least two loudspeaker with two channels to each ear are needed!'
);
end
if
~
strcmpi
(
H
.
signalType
,
'energy'
)
warning
(
'HRTFs are not energy signals! Changing them to energy'
);
H
.
signalType
=
'energy'
;
end
opts
=
ita_parse_arguments
(
opts
,
varargin
(
2
:
end
));
%% Preprocessing
if
(
opts
.
filterlength
==-
1
)
H
=
ita_extend_dat
(
H
,
max
(
2
*
H
.
nSamples
,
2
^
12
),
'forceSamples'
);
else
H
=
ita_extend_dat
(
H
,
opts
.
filterLength
,
'forceSamples'
);
end
if
opts
.
%% Calculation
N
=
H
.
nSamples
;
[
hm
,
hn
]
=
size
(
H
);
f
=
H
.
nBins
;
hfq
=
H
.
freqData
;
c
=
zeros
(
hn
,
hm
,
f
);
CTC
=
itaAudio
(
hn
,
hm
);
for
fdx
=
1
:
f
hh
=
reshape
(
hfq
(
fdx
,:),
hm
,
hn
);
c
(:,:,
fdx
)
=
hh
'/(hh*hh'
+
opts
.
beta
*
eye
(
hm
));
end
aux
=
H
(
1
,
1
);
for
idx
=
1
:
hn
for
jdx
=
1
:
hm
aux
.
freqData
=
squeeze
(
c
(
idx
,
jdx
,:));
CTC
(
idx
,
jdx
)
=
aux
;
end
end
%% Postprocessing
end
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