Fixed point 16-bit Digital Signal Processing library for arduino, embedded and 8-bit systems.

The PlusCLI project has some sample test commands to play with this.

• https://en.wikipedia.org/wiki/CORDIC
• https://en.wikipedia.org/wiki/Binary_angular_measurement
• Reducible's FFT video
• https://en.wikipedia.org/wiki/WAV

• Add Doxygen comments to header
• Split CORDIC in generic functions (rect2polar, polar2rec, rotateVector)
• Realtime sample processing.
  • interrupt driven
  • http://gammon.com.au/forum/?id=11488&reply=5#reply5
  • https://www.arduino.cc/reference/en/language/functions/external-interrupts/attachinterrupt/
  • https://forum.arduino.cc/t/adcsra-adc-control-and-status-register-a/319966
  • https://forum.arduino.cc/t/what-timers-do-the-arduino-libraries-use/43133
  • https://forum.arduino.cc/t/timer-interrupt-in-microseconds/335219
  • sample rate
    • Target should divide evenly into 44.1k or 48k
      • easier to convert to most popular audio sample rates
      • GCD 300
    • Not too high to keep processing load down
    • Cover telephone audio range (300Hz-3.4kHz)
      • Covers human voice and classic modem experiments
    • 6000, 6300, 7350, 8000, 8820, 11025