公开(公告)号：MY176904A

公开(公告)日：2020-08-26

申请号：MYPI2012000521

申请日：2011-06-06

Applicant: PANASONIC IP CORP AMERICA

Inventor： ISHIKAWA TOMOKAZU ,  NORIMATSU TAKESHI ,  ZHOU HUAN ,  CHONG KOK SENG ,  ZHONG HAISHAN

IPC: G10L21/038 ,  G10L21/04

Abstract: To provide a bandwidth extension method which allows reduction of computation amount in bandwidth extension and suppression of deterioration of quality in the bandwidth to be extended. In the bandwidth extension method: a low frequency bandwidth signal is transformed into a QMF domain to generate a first low frequency QMF spectrum (S11); pitch-shifted signals are generated by applying different shifting factors on the low frequency bandwidth signal (S12); a high frequency QMF spectrum is generated by time-stretching the pitch-shifted signals in the QMF domain (S13); the high frequency QMF spectrum is modified (S14); and the modified high frequency QMF spectrum is combined with the first low frequency QMF spectrum (S15).

公开(公告)号：HUE028738T2

公开(公告)日：2017-01-30

申请号：HUE11792129

申请日：2011-06-06

Applicant: PANASONIC IP CORP AMERICA

Inventor： ISHIKAWA TOMOKAZU ,  NORIMATSU TAKESHI ,  ZHOU HUAN ,  CHONG KOK SENG ,  ZHONG HAISHAN

IPC: G10L21/038 ,  G10L21/04

公开(公告)号：AU2011263191B2

公开(公告)日：2016-06-16

申请号：AU2011263191

申请日：2011-06-06

Applicant: PANASONIC IP CORP AMERICA

Inventor： ISHIKAWA TOMOKAZU ,  NORIMATSU TAKESHI ,  ZHOU HUAN ,  CHONG KOK SENG ,  ZHONG HAISHAN

IPC: G10L21/04 ,  G10L19/00 ,  G10L19/02 ,  G10L21/02 ,  G10L21/038

Abstract: Provided is a band enhancement method that can reduce the calculation amounts for enhancing bands and further can suppress the quality degradation of enhanced bands. The band enhancement method comprises the steps of: transforming a low frequency band signal to a QMF range, thereby generating a first low frequency QMF spectrum (S11); applying mutually different shift factors to the low frequency band signal, thereby generating a plurality of pitch-shifted signals (S12); performing a time decompression in the QMF range, thereby generating a high frequency QMF spectrum (S13); modifying the high frequency QMF spectrum (S14); and combining the modified high frequency QMF spectrum with the first low frequency QMF spectrum (S15).

公开(公告)号：PL2581905T3

公开(公告)日：2016-06-30

申请号：PL11792129

申请日：2011-06-06

Applicant: PANASONIC IP CORP AMERICA

Inventor： ISHIKAWA TOMOKAZU ,  NORIMATSU TAKESHI ,  ZHOU HUAN ,  CHONG KOK SENG ,  ZHONG HAISHAN

IPC: G10L21/038 ,  G10L21/04

公开(公告)号：ES2565959T3

公开(公告)日：2016-04-07

申请号：ES11792129

申请日：2011-06-06

Applicant: PANASONIC IP CORP AMERICA

Inventor： ISHIKAWA TOMOKAZU ,  NORIMATSU TAKESHI ,  ZHOU HUAN ,  CHONG KOK SENG ,  ZHONG HAISHAN

IPC: G10L21/038 ,  G10L21/04

Abstract: Un metodo de extension del ancho de banda para la produccion de una senal de audio de ancho de banda completo a partir de una senal de audio de ancho de banda en baja frecuencia, comprendiendo dicho metodo: una primera etapa de transformada (S21) de la transformacion de la senal de ancho de banda en baja frecuencia en un dominio en el banco de filtros de espejo en cuadratura (QMF) para generar un primer espectro QMF de baja frecuencia; una etapa de generacion de un parche armonico de orden bajo (S22) de la generacion de un parche armonico de orden bajo mediante estiramiento en el tiempo de la senal de ancho de banda en baja frecuencia en un dominio QMF; una etapa de generacion de alta frecuencia (S23) de (i) generacion de senales que estan desplazadas en el tono, mediante la aplicacion de diferentes coeficientes de desplazamiento al parche armonico de orden bajo, y (ii) generacion de un espectro QMF de alta frecuencia a partir de las senales; una etapa de modificacion de espectro (S24) de modificacion del espectro QMF de alta frecuencia para satisfacer las condiciones de energia y tonalidad de alta frecuencia; y una etapa de generacion de ancho de banda completo (S25) de la generacion de la senal en ancho de banda completo mediante la combinacion del espectro QMF de alta frecuencia modificado con el primer espectro QMF de baja frecuencia.

公开(公告)号：ZA201200919B

公开(公告)日：2013-07-31

申请号：ZA201200919

申请日：2012-02-07

Applicant: PANASONIC IP CORP AMERICA

Inventor： ISHIKAWA TOMOKAZU ,  ZHOU HUAN ,  ZHONG HAISHAN ,  NORIMATSU TAKESHI ,  CHONG KOK SENG

IPC: G01L20060101 ,  G10L21/038 ,  G10L21/04

Abstract: To provide a bandwidth extension method which allows reduction of computation amount in bandwidth extension and suppression of deterioration of quality in the bandwidth to be extended. In the bandwidth extension method: a low frequency bandwidth signal is transformed into a QMF domain to generate a first low frequency QMF spectrum (S11); pitch-shifted signals are generated by applying different shifting factors on the low frequency bandwidth signal (S12); a high frequency QMF spectrum is generated by time-stretching the pitch-shifted signals in the QMF domain (S13); the high frequency QMF spectrum is modified (S14); and the modified high frequency QMF spectrum is combined with the first low frequency QMF spectrum (S15).

公开(公告)号：EP2581905A4

公开(公告)日：2014-11-05

申请号：EP11792129

申请日：2011-06-06

Applicant: PANASONIC IP CORP AMERICA

Inventor： ISHIKAWA TOMOKAZU ,  NORIMATSU TAKESHI ,  ZHOU HUAN ,  CHONG KOK SENG ,  ZHONG HAISHAN

IPC: G10L21/038 ,  G10L21/04

CPC classification number: G10L19/02 ,  G10L21/038 ,  G10L21/04

Abstract: To provide a bandwidth extension method which allows reduction of computation amount in bandwidth extension and suppression of deterioration of quality in the bandwidth to be extended. In the bandwidth extension method: a low frequency bandwidth signal is transformed into a QMF domain to generate a first low frequency QMF spectrum (S11); pitch-shifted signals are generated by applying different shifting factors on the low frequency bandwidth signal (S12); a high frequency QMF spectrum is generated by time-stretching the pitch-shifted signals in the QMF domain (S13); the high frequency QMF spectrum is modified (S14); and the modified high frequency QMF spectrum is combined with the first low frequency QMF spectrum (S15).