On 9/28/2015 1:46 AM, bitrex wrote:
> Suppose I have a waveform stored in flash memory on a fairly limited
> microprocessor, say an AVR 8 bit or something, and I'm sending it out to
> analog via one of the high-speed PWM channels.
>
> Is there a interpolation algorithm of some type that will allow
> bandlimited frequency transposition of this waveform in real time over a
> significant range on such limited hardware?  Links to any example code
> would be appreciated.

Found an old thread that I think might be helpful, using a phase 
accumulator for linear interpolation:

http://music.columbia.edu/pipermail/music-dsp/2012-May/070778.html

Suppose I have a waveform stored in flash memory on a fairly limited 
microprocessor, say an AVR 8 bit or something, and I'm sending it out to 
analog via one of the high-speed PWM channels.

Is there a interpolation algorithm of some type that will allow 
bandlimited frequency transposition of this waveform in real time over a 
significant range on such limited hardware?  Links to any example code 
would be appreciated.