公开(公告)号：US20150248894A1

公开(公告)日：2015-09-03

申请号：US14698933

申请日：2015-04-29

Applicant: Panasonic Intellectual Property Corporation of America

Inventor： Tomokazu ISHIKAWA ,  Takeshi NORIMATSU ,  Huan ZHOU ,  Kok Seng CHONG ,  Haishan ZHONG

IPC: G10L19/02

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; pitch-shifted signals are generated by applying different shifting factors on the low frequency bandwidth signal; a high frequency QMF spectrum is generated by time-stretching the pitch-shifted signals in the QMF domain; the high frequency QMF spectrum is modified; and the modified high frequency QMF spectrum is combined with the first low frequency QMF spectrum.

Abstract translation: 提供一种允许减少带宽扩展中的计算量并抑制要扩展的带宽中的质量劣化的带宽扩展方法。 在带宽扩展方法中：将低频带宽信号变换成QMF域以产生第一低频QMF频谱; 通过在低频带宽信号上应用不同的移位因子来生成音调移位信号; 通过对QMF域中的音调移位信号进行时间扩展来产生高频QMF频谱; 改变高频QMF频谱; 并且修改的高频QMF频谱与第一低频QMF频谱组合。

公开(公告)号：US20220246159A1

公开(公告)日：2022-08-04

申请号：US17726718

申请日：2022-04-22

Applicant: Panasonic Intellectual Property Corporation of America

Inventor： Tomokazu ISHIKAWA ,  Takeshi NORIMATSU ,  Huan ZHOU ,  Kok Seng CHONG ,  Haishan ZHONG

IPC: G10L19/02 ,  G10L21/038

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; pitch-shifted signals are generated by applying different shifting factors on the low frequency bandwidth signal; a high frequency QMF spectrum is generated by time-stretching the pitch-shifted signals in the QMF domain; the high frequency QMF spectrum is modified; and the modified high frequency QMF spectrum is combined with the first low frequency QMF spectrum.

公开(公告)号：US20170358307A1

公开(公告)日：2017-12-14

申请号：US15688971

申请日：2017-08-29

Applicant: Panasonic Intellectual Property Corporation of America

Inventor： Tomokazu ISHIKAWA ,  Takeshi NORIMATSU ,  Huan ZHOU ,  Kok Seng CHONG ,  Haishan ZHONG

IPC: 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; pitch-shifted signals are generated by applying different shifting factors on the low frequency bandwidth signal; a high frequency QMF spectrum is generated by time-stretching the pitch-shifted signals in the QMF domain; the high frequency QMF spectrum is modified; and the modified high frequency QMF spectrum is combined with the first low frequency QMF spectrum.