Apparatus for processing an audio signal to generate a bandwidth extended signal having a high frequency part and a low frequency part using parametric data for the high frequency part, the parametric data relating to frequency bands of the high frequency part comprises a patch border calculator (2302) for calculating a patch border such that the patch border coincides with a frequency band border of the frequency bands. The apparatus further comprises a patcher (2312) for generating a patched signal using the audio signal (2300) and the patch border.