公开(公告)号：ES2706512T3

公开(公告)日：2019-03-29

申请号：ES16179227

申请日：2013-11-12

Applicant: ERICSSON TELEFON AB L M

Inventor： NÄSLUND SEBASTIAN ,  GRANCHAROV VOLODYA ,  SVEDBERG JONAS

IPC: G10L19/005

Abstract: Un método de ocultación de pérdida de tramas realizado por un decodificador de audio, el método comprende: analizar (S11) cambios de sino de coeficientes transformados en tramas recibidas mediante la determinación de un número de cambios de signo entre los coeficientes transformados correspondientes en los sub-vectores correspondientes de tramas no erróneas consecutivas que no contienen un transitorio, cada sub-vector que comprende múltiples coeficientes de una banda de frecuencia; acumular (S12) el número de cambios de signo en los sub-vectores correspondientes sobre un número predeterminado de tramas no erróneas consecutivas que no contienen un transitorio; y reconstruir (S13) una trama perdida mediante la copia de los coeficientes transformados de una trama no errónea anterior que no contiene un transitorio, pero con signos invertidos de los coeficientes transformados en los sub-vectores que tienen un número acumulado de cambios de signo que sobrepasa un umbral predeterminado.

公开(公告)号：DK3065135T3

公开(公告)日：2019-03-25

申请号：DK16165702

申请日：2015-06-25

Applicant: ERICSSON TELEFON AB L M

Inventor： SVEDBERG JONAS

IPC: G10L19/038 ,  H03M7/30

公开(公告)号：NZ710308A

公开(公告)日：2018-02-23

申请号：NZ71030814

申请日：2014-01-22

Applicant: ERICSSON TELEFON AB L M

Inventor： SVEDBERG JONAS ,  BRUHN STEFAN

IPC: G10L19/005 ,  G10L19/025

Abstract: In some previously proposed methods for frame loss concealment, the parameter freezing and extrapolation technique and re-application of the same decoder model even for lost frames does not always guarantee a smooth and faithful signal evolution from the previously decoded signal frames to the lost frame. This can lead to audible signal discontinuities with corresponding quality impact. Disclosed herein is a method for controlling a concealment method for a lost audio frame of a received audio signal. When an original concealment method is used to create a substitution, a transient condition that could lead to suboptimal reconstruction quality frame is detected (101) in a property of a previously received and reconstructed audio signal. When the transient condition is detected, the original concealment method (102) is modified by selectively adjusting a spectrum magnitude of a substitution frame spectrum. When the original concealment method is used to create the substitution frame, a second condition that could lead to suboptimal reconstruction quality is further detected (101) in a statistical property of observed frame losses. When the second condition is detected, the original concealment method is further modified (102) by selectively adjusting the spectrum magnitude of the substitution frame spectrum.

公开(公告)号：AU2014215734B2

公开(公告)日：2016-08-11

申请号：AU2014215734

申请日：2014-01-22

Applicant: ERICSSON TELEFON AB L M

Inventor： BRUHN STEFAN ,  SVEDBERG JONAS

IPC: G10L19/005

Abstract: In accordance with an example embodiment of the present invention, disclosed is a method and an apparatus thereof for controlling a concealment method for a lost audio frame of a received audio signal. A method for a decoder of concealing a lost audio frame comprises detecting in a property of the previously received and reconstructed audio signal, or in a statistical property of observed frame losses, a condition for which the substitution of a lost frame provides relatively reduced quality. In case such a condition is detected, the concealment method is modified by selectively adjusting a phase or a spectrum magnitude of a substitution frame spectrum.

公开(公告)号：CA2955765A1

公开(公告)日：2016-02-04

申请号：CA2955765

申请日：2015-06-25

Applicant: ERICSSON TELEFON AB L M

Inventor： SVEDBERG JONAS

IPC: G10L19/038 ,  G10L19/16 ,  H03M7/30

Abstract: An encoder and a method therein for Pyramid Vector Quantizer, PVQ, shape search, the PVQ taking a target vector x as input and deriving a vector y by iteratively adding unit pulses in an inner dimension search loop. The method comprises, before entering a next inner dimension search loop for unit pulse addition, determining, based on the maximum pulse amplitude, maxamp y , of a current vector y, whether more than a current bit word length is needed to represent enloop y , in a lossless manner in the upcoming inner dimension loop. The variable enloop y is related to an accumulated energy of the vector y. The performing of this method enables the encoder to keep the complexity of the search at a reasonable level. For example, it enables the encoder to apply an increased precision loop only when it may be needed, by analyzing whether the "worst case scenario" in the upcoming inner loop would require an inner loop with a higher precision than the one currently used.

公开(公告)号：MX2015009210A

公开(公告)日：2015-11-25

申请号：MX2015009210

申请日：2014-01-22

Applicant: ERICSSON TELEFON AB L M

Inventor： SVEDBERG JONAS ,  BRUHN STEFAN

IPC: G10L19/005

Abstract: De conformidad con una modalidad de ejemplo de la presente invención, se describe un método y un aparato del mismo para controlar un método de ocultación para una trama de audio perdida de una señal de audio recibida. Un método para un decodificador de ocultación de una trama de audio perdida comprende detectar en una propiedad de la señal de audio anteriormente recibida y reconstruida, o en una propiedad estadística de pérdidas de trama observadas, una condición para la cual la sustitución de una trama perdida provee calidad relativamente reducida. En el caso de que se detecte una condición de este tipo, el método de ocultación se modifica ajustando selectivamente una fase o una magnitud de espectro de un espectro trama de sustitución.

公开(公告)号：PH12015501507B1

公开(公告)日：2015-09-28

申请号：PH12015501507

申请日：2015-07-02

Applicant: ERICSSON TELEFON AB L M

Inventor： BRUHN STEFAN ,  SVEDBERG JONAS

IPC: G10L19/005 ,  G10L19/00

Abstract: In accordance with an example embodiment of the present invention, disclosed is a method and an apparatus thereof for controlling a concealment method for a lost audio frame of a received audio signal. A method for a decoder of concealing a lost audio frame comprises detecting in a property of the previously received and reconstructed audio signal, or in a statistical property of observed frame losses, a condition for which the substitution of a lost frame provides relatively reduced quality. In case such a condition is detected, the concealment method is modified by selectively adjusting a phase or a spectrum magnitude of a substitution frame spectrum.

公开(公告)号：CA2978416A1

公开(公告)日：2014-08-14

申请号：CA2978416

申请日：2014-01-22

Applicant: ERICSSON TELEFON AB L M (PUBL)

Inventor： BRUHN STEFAN ,  SVEDBERG JONAS

IPC: G10L19/005 ,  G10L19/02

Abstract: Disclosed is a method and an apparatus for adaptation of a frame loss concealment method in audio decoding. The method comprises analyzing a previously received audio signal to perform a frequency selective transient detection on the basis of frequency bands and modifying the frame loss concealment method by frequency band selectively adjusting a spectrum magnitude of a substitution frame spectrum in response to a transient detected in the frequency band. The method further comprises detecting a burst loss and further modifying the concealment method by selectively adjusting a magnitude of a substitution frame spectrum in response to detected burst loss.

公开(公告)号：BRPI0715131A2

公开(公告)日：2012-12-25

申请号：BRPI0715131

申请日：2007-05-28

Applicant: ERICSSON TELEFON AB L M

Inventor： JOHANSSON INGEMAR ,  FRANKKILA TOMAS ,  SVEDBERG JONAS

IPC: H04L1/00

Abstract: The present invention is to select an adaptation scheme for the transmission of the encoded media that results in a satisfactory performance of the transmitted encoded media. A difference from the prior art is that each adaptation scheme defines a set of different transmission formats, wherein each transmission format is a combination of at least two of the parameters the source codec bit rate, the packet rate, the number of frames of each packet (referred to as frame aggregation), and the level of redundancy. By using the different transmission formats, the transmission can be adapted to different operating scenarios and the performance is hence improved.

公开(公告)号：DE69942288D1

公开(公告)日：2010-06-02

申请号：DE69942288

申请日：1999-09-10

Applicant: ERICSSON TELEFON AB L M

Inventor： JOHANNSON INGEMAR ,  SVEDBERG JONAS ,  UVLIDEN ANDERS

IPC: G10L19/00 ,  G10L19/12 ,  G10L19/08 ,  H03M7/36

Abstract: In producing an approximation of an original speech signal from encoded information about the original speech signal, current parameters (EnPar(i)) associated with a current segment of the original speech signal are determined from the encoded information. Reproduction of a noise component of the original speech signal is improved by using at least one of the current parameters and corresponding previous parameters respectively associated with previous segments of the original speech signal (31, 37, 39) to produce a modified parameter (EnPar(i) mod ). The modified parameter is then used (25, 40) to produce an approximation of the current segment of the original speech signal.