US 7,630,500 B1Granted

Spatial disassembly processor

AssigneeBose Corporation

InventorsPaul E. Beckman, Finn A. Arnold

Life of this patent

Estimating the term…

Loading patent…

Abstract

A method of disassembling a pair of input signals L(t) and R(t) to form subband representations of N output channel signals o1(t), o2(t), . . . , oN(t), wherein t is time. The method includes the steps of generating a subband representation of the signal L(t) containing a plurality of subband components Lk(t) where k is an integer ranging from 1 to M; generating a subband representation of the signal R(t) containing a plurality of subband components Rk(t); and constructing the subband representation for each of the plurality of output channel signals, each of those subband representations containing a plurality of subband components oj,k(t), wherein oj,k(t) represents the kth subband of the jth output channel signal and is constructed by combining components of the input signals L(t) and R(t) according to an output construction rule: oj,k(t)=f(Lk(t),Rk(t)) for k=1, 2, . . . , M and j=1, 2, . . . , N.

Claims34

Dependent claims

A method of processing a pair of input signals L(t) and R(t) representing left and right channels of a stereo audio signal, characterized by a predetermined spectral balance and predetermined spatial balance to form subband signals representative of N output channel signals o1(t), o2(t), . . . , on(t), wherein N>2 and t is time, the output channel signals to be reproduced over spatially separated loudspeakers, said method comprising:

generating a first subband signal representation of the signal L(t), said first subband signal representation containing a plurality of first subband frequency sample components Lk(t) where k is an integer ranging from 1 to M;
generating a second subband signal representation of the signal R(t), said second subband signal representation containing a plurality of second subband frequency sample components Rk(t);
and
combining said frequency sample components of the input signals L(t) and R(t) according to an output construction rule oj,k(t)=f(Lk(t),Rk(t)) for k=1, 2, . . . , M and j=1, 2, . . . , N to provide the output subband signal representation for each of said plurality of output channel signals, each of said output subband signal representations containing a plurality of output subband signal components oj,k(t), wherein oj,k(t) represents the kth subband output signal component of the jth output channel signal,
wherein the output construction rule establishes the following relationship for at least some of the subband signal components Lk(t) and Rk(t) and output subband signal components oj,k(t)

L
k
⁡
(
t
)

+

R
k
⁡
(
t
)

=
∑
j
=
1
N
⁢
⁢

o
j
,
k
⁡
(
t
)

and reproducing the N output channel signals with N output speakers while preserving said predetermined spectral balance and said predetermined spatial balance of said input signals.

38 more elements

A spatial disassembly system comprising,

first and second input terminals for receiving first and second input signals L(t) and R(t) representing left and right channels of a stereo audio signal, respectively characterized by predetermined spectral balance and predetermined spatial balance,
a spatial disassembly processor having a plurality of N outputs greater than two, constructed and arranged to
disassemble signals on said first and second inputs including subdividing the signals on said first and second inputs into a plurality of M frequency sample subbands Lk(t) and Rk(t) where k is an integer ranging from 1 to M, and
provide a corresponding plurality of output signals o1(t), o2(t), . . . , on(t), on said plurality of outputs derived from the frequency sample subbands of the disassembled signals according to an output construction rule oj,k(t)=f(Lk(t),Rk(t)) for k=1, 2, . . . , M and j=1, 2, . . . , N,
each of said output subband signal representations containing a plurality of output subband signal components oj,k(t), wherein oj,k(t) represents the kth subband output signal component of the jth output channel signal,
wherein the output construction rule establishes the following relationship for at least some of the subband signal components Lk(t) and Rk(t) and output subband signal components oj,k(t):

L
k
⁡
(
t
)

+

R
k
⁡
(
t
)

=
∑
j
=
1
N
⁢
⁢

o
j
,
k
⁡
(
t
)

and
a corresponding plurality of electroacoustical transducers coupled to a respective one of said plurality of outputs for creating a sound field representative of the first and second input signals on said first and second input terminals preserving said predetermined spectral balance and said predetermined spatial balance of the first and second input signals.

40 more elements

generating a first subband signal representation of the signal L(t), said first subband signal representation containing a plurality of first subband frequency sample components Lk(t) where k is an integer ranging from 1 to M;
generating a second subband signal representation of the signal R(t), said second subband signal representation containing a plurality of second subband frequency sample components Rk(t);
and
combining said frequency sample components of the input signals L(t) and R(t) according to an output construction rule oj,k(t)=f(Lk(t),Rk(t)) for k=1, 2, . . . , M and j=1, 2, . . . , N to provide the output subband signal representation for each of said plurality of output channel signals, each of said output subband signal representations containing a plurality of output subband signal components oj,k(t), wherein oj,k(t) represents the kth subband output signal component of the jth output channel signal,
wherein the output construction rule establishes the following relationship for at least some of the subband signal components Lk(t) and Rk(t) and output subband signal components oj,k(t):

L
k
⁡
(
t
)

2
+

R
k
⁡
(
t
)

2
=
∑
j
=
1
N
⁢
⁢

o
j
,
k
⁡
(
t
)

2
and reproducing the N output channel signals with N output speakers while preserving said predetermined spectral balance and said predetermined spatial balance of said input signals,
wherein the output construction rule is subband specific, i.e., oj,k(t)=fj(Lk(t),(Rk(t)) for k=1, 2, . . . , M with at least two of the subbands having different steering algorithms.

42 more elements

Dependencies are inferred from the claim text.