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Institute of Technical Acoustics (ITA)
toolbox
Commits
df6c798c
Commit
df6c798c
authored
Dec 06, 2017
by
Michael Kohnen
Browse files
updated decoding for non itaAudio
parent
402e2a03
Changes
1
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applications/SpatialAudio/ita_decodeAmbisonics.m
View file @
df6c798c
...
...
@@ -2,12 +2,19 @@ function [ OutputSignals ] = ita_decodeAmbisonics( Bformat, LoudspeakerPos, vara
%ITA_DECODEAMBISONICS Summary of this function goes here
% Detailed explanation goes here
opts
.
decoding
=
'remax'
;
% Decoding strategy (remax,inphase,plane)
% BFormat<nmax,LS>
opts
.
decoding
=
'remax'
;
% Decoding strategy (remax,inphase,plane)
% opts.decoding='none';
opts
=
ita_parse_arguments
(
opts
,
varargin
);
% Initializing further parameters
nmax
=
max
(
Bformat
.
nChannels
);
if
isa
(
Bformat
,
'itaAudio'
)
nmax
=
max
(
Bformat
.
nChannels
);
else
nmax
=
size
(
Bformat
,
2
);
end
N
=
floor
(
sqrt
(
nmax
)
-
1
);
% Weighting for Inphase/ReMax
...
...
@@ -36,10 +43,8 @@ end
% Inphase Decoding
if
(
sum
(
strcmp
(
lower
(
opts
.
decoding
),{
'inphase'
'both'
})))
% Calculates the B-format channel weights for InPhase-Decoding
N
=
obj
.
ambGetOrder
;
% amb order from sim room
nmax
=
(
N
+
1
)
^
2
;
% number of channels
weightsInPhase
=
zeros
(
nmax
,
1
);
N
=
numel
(
obj
.
monitorRoom
.
getSourcePosition
)/
3
;
% get number of loudspeaker
%Dissertation J.Daniel p.314, 'preserve Energy' in 0. order
%g_0=sqrt[N*(2*M+1)/(M+1)^2]
weightsInPhase
(
1
)
=
sqrt
(
N
*
(
2
*
N
+
1
)/(
N
+
1
)
^
2
);
...
...
@@ -53,22 +58,22 @@ if(sum(strcmp(lower(opts.decoding),{'inphase' 'both'})))
g_in
=
weightsInPhase
;
end
weights
=
g_in
.*
g_re
;
%merge weighting factors
weights
=
g_in
.*
g_re
;
% merge weighting factors
%% Applying weighting to BFormat
if
isa
(
Bformat
,
'itaAudio'
)
for
k
=
1
:
Bformat
.
nChannels
Bformat
.
time
(:,
k
)
=
Bformat
.
time
(:,
k
)
.*
weights
(
k
);
end
else
for
k
=
1
:
numel
(
weights
)
Bformat
(:,
k
)
=
weights
(
k
)
.*
Bformat
(:,
k
);
%Apply weighting factors
Bformat
(:,
k
)
=
weights
(
k
)
.*
Bformat
(:,
k
);
end
end
% SH and inversion
%
% SH and inversion
of loudspeaker set-up
Y
=
ita_sph_base
(
LoudspeakerPos
,
N
,
'real'
);
% generate basefunctions
Yinv
=
pinv
(
Y
);
% calculate Pseudoinverse
Yinv
=
pinv
(
Y
);
% calculate Pseudoinverse
, moore penrose, svd
if
isa
(
Bformat
,
'itaAudio'
)
for
k
=
1
:
LoudspeakerPos
.
nPoints
...
...
@@ -78,10 +83,10 @@ if isa(Bformat,'itaAudio')
OutputSignals
(
k
)
=
sum
(
temp
);
end
OutputSignals
=
ita_merge
(
OutputSignals
(:));
OutputSignals
.
channelCoordinates
=
LoudspeakerPos
;
else
OutputSignals
=
Bformat
*
Yinv
;
end
OutputSignals
.
channelCoordinates
=
LoudspeakerPos
;
end
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