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nRF51822 as co-processor for Microbit

I am working with the BBC on the Microbit project. bluetooth nRF51822 has an ARMRegistered CortexTm-M4F CPU which is MUCH more powerful than the ARM Cortex M0 being used as CPU. Is it possible to use this chip AS the CPU? The main use I foresee is to decode CELP for Audiobooks. Since encoding doesn't need to be real time, an exhaustive search can be used for the encoding step, enabling CELP to match ACELP in sound quality. ACELP is used by vendors like Audible and if the ESCELP (exhaustive search code excited linear prediction) can produce equal quality, it would allow audiobooks, Q&A to follow written work and maybe even testing using a formant-testing algorithm to distinguish the numbers zero to 9 (multiple choice). Lessons could even be recorded & saved to be listened again by the pupil.

I see the Microbit as an opportunity for a total sea change in UK teaching which would mean 1 million new Microbits per year so Nordic would be able to secure a much larger order.

With thanks, Sean Dunlevy

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