Arduino Library for INDSP to use with INDSP shield (a DSP for Hamradio).
You can buy one here http://jackdev23.wixsite.com/iw2ndh-dsp
Main features: a. Noise Reduction based on FFT; b. Auto Notch Filter; c. 8 Bands equalizer +/- 9dB = 31,62,125,250,500,1000,2000,4000 Hz d. 7 Passband Filters: -550/850, -450/950, -300/1300, -300/1500, -300/1800, -300/2400, -300/2700 Hz.