公开(公告)号：NZ739387A

公开(公告)日：2020-03-27

申请号：NZ73938714

申请日：2014-01-22

Applicant: ERICSSON TELEFON AB L M

Inventor： SVEDBERG JONAS ,  BRUHN STEFAN

IPC: G10L19/005 ,  G10L19/025 ,  G10L25/69

Abstract: Current state-of-the-art solutions for frame loss concealment typically suffer from quality impairments. Disclosed herein is a frame loss concealment method wherein a segment of a previously synthesized audio signal is used as a prototype frame in order to create a substitution frame for a lost audio frame. The method comprises a step of transforming the prototype frame into a frequency domain. The method further comprises a step of applying a sinusoidal model to the prototype frame to identify the frequency of a sinusoidal component of the audio signal. The method further comprises a step of calculating a phase shift θk for the sinusoidal component. The method further comprises a step of shifting a phase of all spectral coefficients in the prototype frame included in an interval Mk around a sinusoid k by θk and retaining the magnitude of those spectral coefficients. The method further comprises a step of randomizing phases of spectral coefficients that are not phase shifted. The method further comprises a step of creating the substitution frame by performing an inverse frequency transform of a frequency spectrum of the prototype frame.

公开(公告)号：MY170368A

公开(公告)日：2019-07-24

申请号：MYPI2015702413

申请日：2014-01-22

Applicant: ERICSSON TELEFON AB L M

Inventor： BRUHN STEFAN ,  SVEDBERG JONAS

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 (130) of concealing a lost audio frame comprises detecting (101) 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 (102) by selectively adjusting a phase or a spectrum magnitude of a substitution frame spectrum. Fig. 10

公开(公告)号：AU2016225836B2

公开(公告)日：2018-06-21

申请号：AU2016225836

申请日：2016-09-07

Applicant: ERICSSON TELEFON AB L M

Inventor： BRUHN STEFAN ,  SVEDBERG JONAS

IPC: G10L19/005

Abstract: 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 5 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 10 phase or a spectrum magnitude of a substitution frame spectrum.

公开(公告)号：CA2955765C

公开(公告)日：2018-02-13

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：CA2900354C

公开(公告)日：2017-10-24

申请号：CA2900354

申请日：2014-01-22

Applicant: ERICSSON TELEFON AB L M (PUBL)

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：AU2015297066B2

公开(公告)日：2017-09-07

申请号：AU2015297066

申请日：2015-06-25

Applicant: ERICSSON TELEFON AB L M

Inventor： SVEDBERG JONAS

IPC: G10L19/038 ,  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,

公开(公告)号：SG10201704724TA

公开(公告)日：2017-07-28

申请号：SG10201704724T

申请日：2015-06-25

Applicant: ERICSSON TELEFON AB L M (PUBL)

Inventor： SVEDBERG JONAS

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 representenloop y ,in a lossless manner in the upcoming inner dimension loop. The variableenloop 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：HK1222480A1

公开(公告)日：2017-06-30

申请号：HK16110604

申请日：2016-09-06

Applicant: ERICSSON TELEFON AB L M (PUBL)

Inventor： TOFTGRD TOMAS ,  SVEDBERG JONAS ,  GRANCHAROV VOLODYA

IPC: H03M20060101

公开(公告)号：HUE030163T2

公开(公告)日：2017-04-28

申请号：HUE13805625

申请日：2013-11-12

Applicant: ERICSSON TELEFON AB L M (PUBL)

Inventor： NÄSLUND SEBASTIAN ,  GRANCHAROV VOLODYA ,  SVEDBERG JONAS

公开(公告)号：ES2603266T3

公开(公告)日：2017-02-24

申请号：ES13805625

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 errores de trama basado en tramas que incluyen vectores de coeficientes transformados, que incluye los pasos de: seguir (S11) los cambios de signo entre los coeficientes transformados correspondientes de sub-vectores predeterminados, cada uno de los cuales comprende una pluralidad de coeficientes, de tramas estacionarias buenas consecutivas; acumular (S12) el número de cambios de signo en los sub-vectores correspondientes de un número predeterminado de tramas estacionarias buenas consecutivas; reconstruir (S13) una trama errónea con la última trama estacionaria buena, pero con signos invertidos de coeficientes transformados en sub-vectores que tienen un número acumulado de cambios de signo que sobrepasa un umbral predeterminado.