Patent ID: 8401862
Filing Date: 2013-03-19
Classification: G10L

Abstract:
1. An audio encoder for providing an output signal using an input audio signal, comprising: a patch generator configured to generate at least one bandwidth extension high-frequency signal, wherein a bandwidth extension high-frequency signal comprises a high-frequency band, wherein the high-frequency band of a bandwidth extension high-frequency signal is based on a low frequency band of the input audio signal, and wherein different bandwidth extension high-frequency signals comprise different frequencies within their high-frequency bands, if different bandwidth extension high-frequency signals are generated; a comparator configured to calculate a plurality of comparison parameters, wherein a comparison parameter is calculated based on a comparison of the input audio signal and a generated bandwidth extension high-frequency signal, wherein each comparison parameter of the plurality of comparison parameters is calculated based on a different offset frequency between the input audio signal and a generated bandwidth extension high-frequency signal, and wherein the comparator is configured to determine a comparison parameter from the plurality of comparison parameters, wherein the determined comparison parameter fulfills a predefined criterion; and an output interface configured to provide the output signal for transmission or storage, wherein the output signal comprises a parameter indication based on an offset frequency corresponding to the determined comparison parameter, wherein the comparator is configured to perform the comparison of the input audio signal and the generated bandwidth extension high-frequency signal by calculating a result of a cross correlation of the input audio signal and the generated bandwidth extension high-frequency signal, wherein the comparison parameter to be calculated is based on the result of the cross correlation, wherein a parameter of the cross correlation is an offset frequency of the bandwidth extension high-frequency signal and is therefore associated with the calculated comparison parameter, and at least one of the patch generator, the comparator and the output interface comprises a hardware implementation.