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Frequency-Domain Additive Synthesis with an Oversampled Weighted Overlap-Add Filterbank for a Portable Low-Power MIDI Synthesizer
This paper discusses a hybrid audio synthesis method employing both additive synthesis and DPCM audio playback, and the implementation of a miniature synthesizer system that accepts MIDI as an input format. Additive synthesis is performed in the frequency domain using a weighted overlap-add filterbank, providing efficiency gains compared to previously known methods. The synthesizer system is implemented on an ultra-miniature, low-power, reconfigurable application specific digital signal processing platform. This low-resource MIDI synthesizer is suitable for portable, low-power devices such as mobile telephones and other portable communication devices. Several issues related to the additive synthesis method, DPCM codec design, and system tradeoffs are discussed.
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