Invention Application
US20150248894A1 BANDWIDTH EXTENSION METHOD, BANDWIDTH EXTENSION APPARATUS, PROGRAM, INTEGRATED CIRCUIT, AND AUDIO DECODING APPARATUS
审中-公开
带宽扩展方法，带宽扩展设备，程序，集成电路和音频解码设备
- Patent Title: BANDWIDTH EXTENSION METHOD, BANDWIDTH EXTENSION APPARATUS, PROGRAM, INTEGRATED CIRCUIT, AND AUDIO DECODING APPARATUS
- Patent Title (中): 带宽扩展方法，带宽扩展设备，程序，集成电路和音频解码设备
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Application No.: US14698933Application Date: 2015-04-29
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Publication No.: US20150248894A1Publication Date: 2015-09-03
- Inventor: Tomokazu ISHIKAWA , Takeshi NORIMATSU , Huan ZHOU , Kok Seng CHONG , Haishan ZHONG
- Applicant: Panasonic Intellectual Property Corporation of America
- Priority: JP2010-132205 20100609
- Main IPC: G10L19/02
- IPC: G10L19/02
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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