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Digital Audio Processing on a Tiny Scale: Hardware and Software for Personal Devices

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The design of an audio signal processor, graphical programming environment, DSP software and parameter adjustment tool is described with reference to the hardware and software requirements of the audio sweetening function in personal devices, particularly cell phones. Special care is taken in the hardware design to ensure low operating power, small size (4mm*4mm package) or 0.5 to 1 sq mm area depending on geometry, stereo analog and digital I/O and high performance. The parameter adjustment tool allows real time control of the DSP so that processing may be customized to the actual properties of the audio sources and the acoustic properties of the enclosure and speakers. A live demonstration of the programming and parameter adjustment of the processor will be given as part of the presentation of the paper.

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