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A Unified Approach to Low- and High-frequency Bandwidth Extension
Extending the bandwidth of an audio signal may be useful at the low or high end of the frequency spectrum, depending on the application. Also, the actual bandwidth extension algorithm may rely entirely on psychoacoustic effects or may create a physical extension of the signal spectrum. We have developed a common framework for all these problems, and from this framework derived algorithms that address diverse applications in audio signal processing for bandwidth extension. Specifically, we describe algorithms for bandwidth extension applied to enhancing reproduction of bandlimited signals (at the low or high end of the frequency spectrum), and for enhancing reproduction over small loudspeakers.
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