Audio encoder and bandwidth extension decoder

摘要

Abstract Audio encoder for providing an output signal (132) using an input audio signal (102), comprising: a patch generator (110) configured to generate a bandwidth extension 5 high-frequency signal (112), wherein the bandwidth extension high-frequency signal (112) comprises a high-frequency band, wherein the high-frequency band of the bandwidth extension high-frequency signal (112) is derived from a low frequency band of the input audio signal (102) by shifting the low-frequency part by a fixed value using a side band modulation; a comparator (120) configured to perform a comparison of the 10 input audio signal filtered by a bandpass filter (420) and the bandwidth extension high frequency signal (112) using a cross correlation calculation in regular time intervals between amplitude spectra of windowed signal sections of the input audio signal filtered by the bandpass filter (420) and the bandwidth extension high-frequency signal (112) to determine a lag for a maximum correlation for a signal section; and an output 15 interface (130) configured to provide the output signal (132) for transmission or storage, wherein the output signal (132) comprises a parameter indication based on the lag for the maximum correlation. Figure 1 6544503_1 (GHMatters) P87339.AU.2 SARAHVV 3/07/2015 patch 1 generator 110 comparator 1 20 output 130 interface ,-132