Spatial disassembly processor
Two-channel input audio signals are processed to construct output audio signals by decomposing the two-channel input audio signals into a plurality of two-channel subband audio signals. Separately, in each of a plurality of subbands, at least three generated subband audio signals are generated by steering the two-channel subband audio signals into at least three generated signal locations. The output audio signals are synthesized from the generated subband audio signals. The steering applies differing construction rules in at least two of the plurality of subbands.
1. A method of processing two-channel input audio signals to construct output audio signals, the method comprising:
decomposing the two-channel input audio signals into a plurality of two-channel subband audio signals;
separately in each of a plurality of subbands generating at least three generated subband audio signals by steering the two-channel subband audio signals into at least three generated signal locations; and
synthesizing the output audio signals from the generated subband audio signals,
wherein the steering applies differing construction rules in at least two of the plurality of subbands,
wherein the two-channel subband audio signals in a first subband k are steered according to a construction rule that maintains the relationship
L
k
(
t
)
+
R
k
(
t
)
=
∑
j
=
1
N
o
j
,
k
(
t
)
,
where L k (t) represents the first subband k of a left input channel, R k (t) represents the first subband k of a right input channel, o j,k (t) represents the first subband k of the j th output channel, and N is the number of output channels.
2. The method of claim 1 wherein
the two-channel subband audio signals in a second subband k 2 are steered according to a construction rule that maintains the relationship
L
k
2
(
t
)
2
+
R
k
2
(
t
)
2
=
∑
j
=
1
N
o
j
,
k
2
(
t
)
2
,
where L k2 (t) represents the second subband k 2 of a left input channel, R k2 (t) represents the second subband k 2 of a right input channel, o j,k2 (t) represents the second subband k 2 of the j th output channel, and N is the number of output channels.
3. The method of claim 1 wherein the steering applies differing construction rules in at least two of the generated subband audio signals.
4. The method of claim 1 wherein synthesizing the output audio signals comprises:
for each of the generated signal locations, recombining the generated subband audio signals of each subband at that signal location into an output audio signal.
5. The method of claim 1 wherein synthesizing the output audio signals comprises:
separately in each of a plurality of subbands, steering the generated audio signals to generate subband components of two output audio signals, and
recombining the subband components of the two output audio signals into the output audio signals.