公开(公告)号：US10943594B2

公开(公告)日：2021-03-09

申请号：US16546898

申请日：2019-08-21

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Magdalena Kaniewska ,  Stephane Ragot

IPC: G10L21/00 ,  G10L19/00 ,  G10L21/04 ,  G10L19/087 ,  G10L25/72 ,  G10L19/24 ,  G10L21/038

Abstract: A method and device are provided for determining an optimized scale factor to be applied to an excitation signal or a filter during a process for frequency band extension of an audio frequency signal. The band extension process includes decoding or extracting, in a first frequency band, an excitation signal and parameters of the first frequency band including coefficients of a linear prediction filter, generating an excitation signal extending over at least one second frequency band, filtering using a linear prediction filter for the second frequency band. The determination method includes determining an additional linear prediction filter, of a lower order than that of the linear prediction filter of the first frequency band, the coefficients of the additional filter being obtained from the parameters decoded or extracted from the first frequency and calculating the optimized scale factor as a function of at least the coefficients of the additional filter.

公开(公告)号：US10668760B2

公开(公告)日：2020-06-02

申请号：US15869560

申请日：2018-01-12

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Magdalena Kaniewska ,  Stephane Ragot

IPC: G10L19/00 ,  B41K3/56 ,  G10L21/038 ,  B41K1/04 ,  B41K1/10 ,  B41K1/12 ,  B41K1/38 ,  B41K1/40 ,  B41K1/42 ,  G10L19/02 ,  G10L25/21 ,  G10L19/26

Abstract: A method is provided for extending the frequency band of an audio signal during a decoding or improvement process. The method includes obtaining the decoded signal in a first frequency band, referred to as a low band. Tonal components and a surround signal are extracted from the signal from the low-band signal, and the tonal components and the surround signal are combined by adaptive mixing using energy-level control factors to obtain an audio signal, referred to as a combined signal. The low-band decoded signal before the extraction step or the combined signal after the combination step are extended over at least one second frequency band which is higher than the first frequency band. Also proved are a frequency-band extension device which implements the described method and a decoder including a device of this type.

公开(公告)号：US10943593B2

公开(公告)日：2021-03-09

申请号：US16542440

申请日：2019-08-16

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Magdalena Kaniewska ,  Stephane Ragot

IPC: G10L21/00 ,  G10L19/00 ,  G10L21/04 ,  G10L19/087 ,  G10L25/72 ,  G10L19/24 ,  G10L21/038

Abstract: A method and device are provided for determining an optimized scale factor to be applied to an excitation signal or a filter during a process for frequency band extension of an audio frequency signal. The band extension process includes decoding or extracting, in a first frequency band, an excitation signal and parameters of the first frequency band including coefficients of a linear prediction filter, generating an excitation signal extending over at least one second frequency band, filtering using a linear prediction filter for the second frequency band. The determination method includes determining an additional linear prediction filter, of a lower order than that of the linear prediction filter of the first frequency band, the coefficients of the additional filter being obtained from the parameters decoded or extracted from the first frequency and calculating the optimized scale factor as a function of at least the coefficients of the additional filter.

公开(公告)号：US10566004B2

公开(公告)日：2020-02-18

申请号：US15668922

申请日：2017-08-04

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Balazs Kovesi ,  Stephane Ragot

IPC: G10L19/00 ,  G10L19/04 ,  G10L19/005 ,  G10L19/18 ,  H03H17/06 ,  G10L19/24

Abstract: A method and device for resampling an audio frequency signal in an audio frequency signal coding or decoding. The method includes the following acts for each signal block to be resampled: determining, by adaptive linear prediction, a number of future signal samples, this number being defined as a function of a chosen resampling delay; constructing a resampling support vector from at least samples of the current block and determined future signal samples; applying a resampling filter to the samples of the resampling support vector.

公开(公告)号：US11312164B2

公开(公告)日：2022-04-26

申请号：US16926818

申请日：2020-07-13

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Magdalena Kaniewska ,  Stephane Ragot

IPC: G10L21/038 ,  B41K3/56 ,  B41K1/04 ,  B41K1/10 ,  B41K1/12 ,  B41K1/38 ,  B41K1/40 ,  B41K1/42 ,  G10L19/02 ,  G10L25/21 ,  G10L19/26 ,  G10L21/02 ,  G10L19/00

Abstract: A method is provided for extending the frequency band of an audio signal during a decoding or improvement process. The method includes obtaining the decoded signal in a first frequency band, referred to as a low band. Tonal components and a surround signal are extracted from the signal from the low-band signal, and the tonal components and the surround signal are combined by adaptive mixing using energy-level control factors to obtain an audio signal, referred to as a combined signal. The low-band decoded signal before the extraction step or the combined signal after the combination step are extended over at least one second frequency band which is higher than the first frequency band. Also proved are a frequency-band extension device which implements the described method and a decoder including a device of this type.

公开(公告)号：US10783895B2

公开(公告)日：2020-09-22

申请号：US16556332

申请日：2019-08-30

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Magdalena Kaniewska ,  Stephane Ragot

IPC: G10L19/00 ,  G10L21/00 ,  G10L21/04 ,  G10L19/087 ,  G10L25/72 ,  G10L19/24 ,  G10L21/038

Abstract: A method and device are provided for determining an optimized scale factor to be applied to an excitation signal or a filter during a process for frequency band extension of an audio frequency signal. The band extension process includes decoding or extracting, in a first frequency band, an excitation signal and parameters of the first frequency band including coefficients of a linear prediction filter, generating an excitation signal extending over at least one second frequency band, filtering using a linear prediction filter for the second frequency band. The determination method includes determining an additional linear prediction filter, of a lower order than that of the linear prediction filter of the first frequency band, the coefficients of the additional filter being obtained from the parameters decoded or extracted from the first frequency and calculating the optimized scale factor as a function of at least the coefficients of the additional filter.

公开(公告)号：US10403296B2

公开(公告)日：2019-09-03

申请号：US15025138

申请日：2014-09-26

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Balazs Kovesi ,  Stephane Ragot

IPC: G10L19/00 ,  G10L19/04 ,  G10L19/005 ,  G10L19/18 ,  H03H17/06 ,  G10L19/24

Abstract: A method and device for resampling an audio frequency signal in an audio frequency signal coding or decoding. The method includes the following acts for each signal block to be resampled: determining, by adaptive linear prediction, a number of future signal samples, this number being defined as a function of a chosen resampling delay; constructing a resampling support vector from at least samples of the current block and determined future signal samples; applying a resampling filter to the samples of the resampling support vector.

公开(公告)号：US11325407B2

公开(公告)日：2022-05-10

申请号：US16939104

申请日：2020-07-27

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Magdalena Kaniewska ,  Stephane Ragot

IPC: G10L21/038 ,  B41K3/56 ,  B41K1/04 ,  B41K1/10 ,  B41K1/12 ,  B41K1/38 ,  B41K1/40 ,  B41K1/42 ,  G10L19/02 ,  G10L25/21 ,  G10L19/26 ,  G10L21/02 ,  G10L19/00

Abstract: A method is provided for extending the frequency band of an audio signal during a decoding or improvement process. The method includes obtaining the decoded signal in a first frequency band, referred to as a low band. Tonal components and a surround signal are extracted from the signal from the low-band signal, and the tonal components and the surround signal are combined by adaptive mixing using energy-level control factors to obtain an audio signal, referred to as a combined signal. The low-band decoded signal before the extraction step or the combined signal after the combination step are extended over at least one second frequency band which is higher than the first frequency band. Also proved are a frequency-band extension device which implements the described method and a decoder including a device of this type.

公开(公告)号：US10730329B2

公开(公告)日：2020-08-04

申请号：US16011153

申请日：2018-06-18

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Magdalena Kaniewska ,  Stephane Ragot

IPC: G10L19/00 ,  B41K3/56 ,  G10L21/038 ,  B41K1/04 ,  B41K1/10 ,  B41K1/12 ,  B41K1/38 ,  B41K1/40 ,  B41K1/42 ,  G10L19/02 ,  G10L25/21 ,  G10L19/26

Abstract: A method is provided for extending the frequency band of an audio signal during a decoding or improvement process. The method includes obtaining the decoded signal in a first frequency band, referred to as a low band. Tonal components and a surround signal are extracted from the signal from the low-band signal, and the tonal components and the surround signal are combined by adaptive mixing using energy-level control factors to obtain an audio signal, referred to as a combined signal. The low-band decoded signal before the extraction step or the combined signal after the combination step are extended over at least one second frequency band which is higher than the first frequency band. Also proved are a frequency-band extension device which implements the described method and a decoder including a device of this type.

公开(公告)号：US10672412B2

公开(公告)日：2020-06-02

申请号：US16553595

申请日：2019-08-28

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Magdalena Kaniewska ,  Stephane Ragot

IPC: G10L19/00 ,  G10L21/00 ,  G10L21/04 ,  G10L19/087 ,  G10L25/72 ,  G10L19/24 ,  G10L21/038

Abstract: A method and device are provided for determining an optimized scale factor to be applied to an excitation signal or a filter during a process for frequency band extension of an audio frequency signal. The band extension process includes decoding or extracting, in a first frequency band, an excitation signal and parameters of the first frequency band including coefficients of a linear prediction filter, generating an excitation signal extending over at least one second frequency band, filtering using a linear prediction filter for the second frequency band. The determination method includes determining an additional linear prediction filter, of a lower order than that of the linear prediction filter of the first frequency band, the coefficients of the additional filter being obtained from the parameters decoded or extracted from the first frequency and calculating the optimized scale factor as a function of at least the coefficients of the additional filter.