公开(公告)号：CA2940382C

公开(公告)日：2019-03-05

申请号：CA2940382

申请日：2015-02-26

Applicant: ERICSSON TELEFON AB L M

Inventor： SVEDBERG JONAS

IPC: H03M7/30 ,  G10L19/038 ,  H04N19/124

Abstract: A method for pyramid vector quantization indexing of audio/video signals comprises obtaining (402) of an integer input vector representing the audio/video signal samples. A leading sign is extracted(404) from the integer input vector. The leading sign is a sign of a terminal non-zero coefficient in the integer input vector. The terminal non-zero coefficient is one of a first non-zero coefficient and a last non-zero coefficient in the integer input vector. The integer input vector is indexed (406) with a pyramid vector quantization enumeration scheme into an output index representing the audio/video signal samples. The pyramid vector quantization enumeration scheme is designed for neglecting the sign of the terminal non-zero coefficient. The output index and the leading sign are outputted (408). A corresponding method for de-indexing, an encoder, a decoder, and computer programs therefore are also disclosed.

公开(公告)号：DK3098811T3

公开(公告)日：2019-01-28

申请号：DK16179227

申请日：2013-11-12

Applicant: ERICSSON TELEFON AB L M

Inventor： NÄSLUND SEBASTIAN ,  GRANCHAROV VOLODYA ,  SVEDBERG JONAS

IPC: G10L19/005

公开(公告)号：AU2018203449A1

公开(公告)日：2018-06-07

申请号：AU2018203449

申请日：2018-05-16

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. Detect a condition in a property> Condition detected Modify concealment method

公开(公告)号：AU2017265085A1

公开(公告)日：2017-12-14

申请号：AU2017265085

申请日：2017-11-23

Applicant: ERICSSON TELEFON AB L M (PUBL)

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 5 entering a next inner dimension search loop for unit pulse addition, determining, based on the maximum pulse amplitude, maxampy, of a current vector y, whether more than a current bit word length is needed to represent enloopy, in a lossless manner in the upcoming inner dimension loop. The variable enloopy is related to an accumulated energy of the vector y. The performing of this method enables the 0 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. 5 (Figure 1) Determine word length for enloopy for next inner loop, based on maxampy 102 Run inner loop with determined word length for enloopy (selected precision loop) 103 Update maxampy after addition of pulse 104 in inner loop Figure 1 Keep track of/Determine maxampy 201 Determine xabsmax 202 ----- Determine max upshift of corrxy for next inner loop, based on xabsmax ['--203 Determine word length for enloopy for next inner loop, based on maxampy 204 Run inner loop with determined word length I for enloopy and determined upshift for corrxy Update maxampy 206 after addition of pulse in inner loop i -~~~~ ~ ~ _ --- - - - - - - - - - -I Figure 2

公开(公告)号：NZ726879A

公开(公告)日：2017-10-27

申请号：NZ72687915

申请日：2015-06-25

Applicant: ERICSSON TELEFON AB L M (PUBL)

Inventor： SVEDBERG JONAS

IPC: H03M7/30 ,  G10L19/038

Abstract: It is desirable for a structured PVQ to enable a computationally efficient shape search which still provides a high Signal to Noise ratio, especially for implementations involving a fixed precision Digital Signal Processor (DSP). Disclosed herein is a method for Pyramid Vector Quantizer (PVQ) shape search, performed by an encoder. The PVQ takes a target vector x as input and derives 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 a maximum pulse amplitude (maxampy) of a current vector y, whether more than a current bit word length is needed to represent, in a lossless manner, a variable (enloopy) related to an accumulated energy of y, in the next inner dimension search loop. The method further comprises, when more than the current bit word length is needed to represent enloopy, performing inner loop calculations using a longer bit word length than the current bit word length to represent enloopy. The method enables the encoder to keep the complexity of the search at a reasonable level.

公开(公告)号：SG10201700846UA

公开(公告)日：2017-03-30

申请号：SG10201700846U

申请日：2014-01-22

Applicant: ERICSSON TELEFON AB L M

Inventor： BRUHN STEFAN ,  SVEDBERG JONAS

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：ES2603827T3

公开(公告)日：2017-03-01

申请号：ES14704935

申请日：2014-01-22

Applicant: ERICSSON TELEFON AB L M

Inventor： BRUHN STEFAN ,  SVEDBERG JONAS

IPC: G10L19/005

Abstract: Un método para controlar un método de ocultación para una trama de audio perdida de una señal de audio recibida, comprendiendo el método : - detectar (101, 122) en una propiedad de una señal de audio previamente recibida y reconstruida una condición transitoria que podría llevar a una calidad de reconstrucción subóptima, cuando un método de ocultación original se usa para crear una trama de sustitución, y - modificar (102, 125) el método de ocultación original mediante ajuste selectivo de una magnitud del espectro de un espectro de una trama de sustitución, cuando se detecta la condición transitoria . - además detectar (101, 121) en una propiedad estadística de pérdidas de trama observadas una segunda condición que podría llevar a una calidad de reconstrucción subóptima, cuando el método de ocultación original se usa para crear la trama de sustitución, y - además modificar (102, 123, 127) el método de ocultación original mediante el ajuste selectivo de la magnitud del espectro del espectro de la trama de sustitución, cuando se detecta la segunda condición.

公开(公告)号：AU2015297066A1

公开(公告)日：2016-12-15

申请号：AU2015297066

申请日：2015-06-25

Applicant: ERICSSON TELEFON AB L M (PUBL)

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：ES2586712T3

公开(公告)日：2016-10-18

申请号：ES15733942

申请日：2015-06-25

Applicant: ERICSSON TELEFON AB L M (PUBL)

Inventor： SVEDBERG JONAS

IPC: G10L19/038 ,  H03M7/30

Abstract: Un método para búsqueda de forma de Cuantificador de Vector en Pirámide, PVQ, realizada por un codificador, el PVQ que toma un vector objetivo x como entrada y que deriva un vector y añadiendo iterativamente pulsos unidad en un bucle de búsqueda de dimensión interior, el método que se caracteriza por: antes de entrar en un siguiente bucle de búsqueda de dimensión interior para adición de pulso unidad: - determinar (102, 204), en base a una amplitud de pulso máxima, maxampy, de un vector actual y, si se necesita más de una longitud de palabra de bit actual para representar, de una manera sin pérdidas, una variable, enloopy, relacionada con una energía acumulada de y, en el bucle de dimensión interior próximo (103).

公开(公告)号：AU2016225836A1

公开(公告)日：2016-10-06

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.