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Figure 10 | EURASIP Journal on Audio, Speech, and Music Processing

Figure 10

From: An Overview of the Coding Standard MPEG-4 Audio Amendments 1 and 2: HE-AAC, SSC, and HE-AAC v2

Figure 10

Example of high-frequency generation and inverse filtering. The figure shows the frequency spectra of the low-band signal and the subsequent high-band signals. The signal is an excerpt of a classical music piece coded at 24 kbps mono. The frequency range for SBR, as given in the bit stream for the configuration used, is 5.5 kHz to 15 kHz. This range is covered by two consecutive patches, A and B, where A has a larger frequency range. Finally, three inverse filtering regions are given by the bit stream, where the frequency border of the second and third region coincide with the patch border.

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