I saw this on comp.dsp. I don't have a smartphone to try it with, but it might be interesting.
"Our Java, Android and iOS software development lab at the ASU SenSIP center and NCSS I/UCRC released the award winning Android JDSP (AJDSP). This is a mobile tool for signal processing simulations that includes filter design, FFTs, z plane analysis and several other functions."
This is now freely available on Google Play: http://lnkd.in/bBmxdv4
"Our Java, Android and iOS software development lab at the ASU SenSIP center and NCSS I/UCRC released the award winning Android JDSP (AJDSP). This is a mobile tool for signal processing simulations that includes filter design, FFTs, z plane analysis and several other functions."
This is now freely available on Google Play: http://lnkd.in/bBmxdv4