US 12,633,298 B2 · Apparatus for encoding a speech signal employing ACELP in the autocorrelation domain

Abstract

An apparatus for encoding a speech signal that determines a codebook vector of a speech coding algorithm includes a matrix determiner for determining an autocorrelation matrix R, and a codebook vector determiner for determining the codebook vector depending on the autocorrelation matrix R. The matrix determiner determines the autocorrelation matrix R by determining vector coefficients of a vector r, wherein the autocorrelation matrix R includes a plurality of rows and a plurality of columns, wherein the vector r indicates one of the columns or one of the rows of the autocorrelation matrix R, wherein R(i, j)=r(|i−j|), wherein R(i, j) indicates the coefficients of the autocorrelation matrix R, wherein i is a first index indicating one of a plurality of rows of the autocorrelation matrix R, and wherein j is a second index indicating one of the plurality of columns of the autocorrelation matrix R.

Claims20

Dependent claims

An apparatus for encoding an audio signal by determining a codebook vector of an audio coding algorithm, wherein the apparatus comprises:

wherein the apparatus is configured for determining an autocorrelation matrix R, and
wherein the apparatus is configured for determining the codebook vector depending on the autocorrelation matrix R,
wherein the apparatus is configured to acquire an encoded audio signal using the codebook vector,
wherein the apparatus is configured to determine the autocorrelation matrix R by determining vector coefficients of a vector r, wherein
R
⁡
(
i
,
j
)
=
r
⁡
(
❘
"\[LeftBracketingBar]"
i
-
j
❘
"\[RightBracketingBar]"
)
,
wherein R(i, j) indicates the coefficients of the autocorrelation matrix R, wherein i indicates a first index, wherein j indicates a second index,
wherein the apparatus is configured to determine a codebook vector ê of the audio coding algorithm which maximizes the normalized correlation
f
⁡
(
e
^
)
=
(
e
T
⁢
R
⁢
e
^
)
2
e
^
⁢
T
R
⁢
e
^
wherein R is the autocorrelation matrix, wherein R is a Hermitian Toeplitz matrix, and wherein ê is one of the codebook vectors of the audio coding algorithm, and
wherein e is an original, unquantized residual signal,
wherein superscript T denotes transpose.

51 more elements

A system comprising:

an apparatus for encoding an audio signal by determining a codebook vector of an audio coding algorithm,
wherein the apparatus for encoding is configured for determining an autocorrelation matrix R, and
wherein the apparatus for encoding is configured for determining the codebook vector depending on the autocorrelation matrix R,
wherein the apparatus for encoding is configured to determine the autocorrelation matrix R by determining vector coefficients of a vector r,
wherein
R
⁡
(
i
,
j
)
=
r
⁡
(
❘
"\[LeftBracketingBar]"
i
-
j
❘
"\[RightBracketingBar]"
)
,
wherein R(i, j) indicates the coefficients of the autocorrelation matrix R,
wherein i indicates a first index, wherein j indicates a second index,
wherein the apparatus for encoding is configured to determine a codebook vector ê of the audio coding algorithm which maximizes the normalized correlation
f
⁡
(
e
^
)
=
(
e
T
⁢
R
⁢
e
^
)
2
e
^
T
⁢
R
⁢
e
^
wherein R is the autocorrelation matrix, wherein R is a Hermitian Toeplitz matrix, and wherein & is one of the codebook vectors of the audio coding algorithm, and wherein e is an original, unquantized residual signal
for encoding an input audio signal to acquire an encoded audio signal, and
a decoder for decoding an encoded audio signal being encoded by an apparatus for encoding an audio signal by determining a codebook vector of an audio coding algorithm,
wherein the decoder is configured for determining an autocorrelation matrix R, and
wherein the decoder is configured for determining the codebook vector depending on the autocorrelation matrix R,
wherein the decoder is configured to determine the autocorrelation matrix R by determining vector coefficients of a vector r, wherein
R
⁡
(
i
,
j
)
=
r
⁡
(
❘
"\[LeftBracketingBar]"
i
-
j
❘
"\[RightBracketingBar]"
)
,
wherein R(i, j) indicates the coefficients of the autocorrelation matrix R,
wherein i indicates a first index, wherein j indicates a second index
for decoding the encoded audio signal,
wherein superscript T denotes transpose.

80 more elements

A non-transitory computer-readable medium comprising a computer program for implementing, when being executed on a computer or signal processor, the method comprising:

encoding an input audio signal according to the method for encoding an audio signal by determining a codebook vector of an audio coding algorithm, wherein the method for encoding comprises:
determining an autocorrelation matrix R, and
determining the codebook vector depending on the autocorrelation matrix R,
wherein determining an autocorrelation matrix R comprises determining vector coefficients of a vector r, wherein
R
⁡
(
i
,
j
)
=
r
⁡
(
❘
"\[LeftBracketingBar]"
i
-
j
❘
"\[RightBracketingBar]"
)
,
wherein R(i, j) indicates the coefficients of the autocorrelation matrix R,
wherein i indicates a first index, wherein j indicates a second index, to acquire an encoded audio signal,
wherein the method comprises determining a codebook vector ê of the audio coding algorithm which maximizes the normalized correlation
f
⁡
(
e
^
)
=
(
e
T
⁢
R
⁢
e
^
)
2
e
^
T
⁢
R
⁢
e
^
wherein R is the autocorrelation matrix, wherein R is a Hermitian Toeplitz matrix, and wherein ê is one of the codebook vectors of the audio coding algorithm, and wherein e is an original, unquantized residual signal, and
decoding the encoded audio signal according to the method for decoding an encoded audio signal being encoded according to the method for encoding an audio signal by determining a codebook vector of an audio coding algorithm,
wherein the method for encoding comprises:
determining an autocorrelation matrix R, and
determining the codebook vector depending on the autocorrelation matrix R,
wherein determining an autocorrelation matrix R comprises determining vector coefficients of a vector r, wherein
R
⁡
(
i
,
j
)
=
r
⁡
(
❘
"\[LeftBracketingBar]"
i
-
j
❘
"\[RightBracketingBar]"
)
,
wherein R(i, j) indicates the coefficients of the autocorrelation matrix R,
wherein i indicates a first index, wherein j indicates a second index,
wherein the codebook vector is a codebook vector ê of the audio coding algorithm which maximizes the normalized correlation
f
⁡
(
e
^
)
=
(
e
T
⁢
R
⁢
e
^
)
2
e
^
T
⁢
R
⁢
e
^
wherein R is the autocorrelation matrix, and wherein ê is one of the codebook vectors of the audio coding algorithm, and wherein e is an original, unquantized residual signal,
wherein superscript T denotes transpose.

105 more elements

Dependencies are inferred from the claim text.

Apparatus for encoding a speech signal employing ACELP in the autocorrelation domain

Life of this patent

Apparatus for encoding a speech signal employing ACELP in the autocorrelation domain

Life of this patent

Abstract

Claims20