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公开(公告)号：US11749289B2
公开(公告)日：2023-09-05
申请号：US17726718
申请日：2022-04-22
Inventor： Tomokazu Ishikawa , Takeshi Norimatsu , Huan Zhou , Kok Seng Chong , Haishan Zhong
IPC: G10L19/02 , 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; 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.
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公开(公告)号：US11341977B2
公开(公告)日：2022-05-24
申请号：US16729575
申请日：2019-12-30
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.
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公开(公告)号：US10566001B2
公开(公告)日：2020-02-18
申请号：US15688971
申请日：2017-08-29
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.
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公开(公告)号：US09799342B2
公开(公告)日：2017-10-24
申请号：US14698933
申请日：2015-04-29
Inventor： Tomokazu Ishikawa , Takeshi Norimatsu , Huan Zhou , Kok Seng Chong , Haishan Zhong
IPC: G10L19/02 , 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; 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.
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