Bandwidth extension method, bandwidth extension apparatus, program, integrated circuit, and audio decoding apparatus
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United States of America Patent
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Oct 24, 2017
Grant Date -
Sep 3, 2015
app pub date -
Apr 29, 2015
filing date -
Jun 9, 2010
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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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