Jon- > The UW Quantum System Engineering Laboratory has written > code for Magnetic Resonance Force Microscopy (MRFM). > The code is available from > > http://staff.washington.edu/~jon/gr-mrfm/ > > Some of the code might be useful to other GNU Radio users. On the > FPGA side, there is a 2-stage biquad filter with 24-bit (not 16-bit) > data path and filter coefficients. There is also an input multiplexer > and adder. On the host side, there is code (in Python with SciPy) > that transforms transfer functions, expressed as ratios of polynomials > with floating point coeffcients, into cascaded biquad stages with > scaled integer coeffcients. The host side code acts as a server, so > it can communicate with the MRFM experiment software over TCP/IP > sockets. There is a sample client, also in Python with Scipy. > > I have put links to our site on the Wiki OurUsers and OtherCode pages.
I'm curious .. what do use the 'biquad filters' for? I assume you mean that you've implemented a 4th order IIR filter? If so that would mean somewhat non-linear phase depending on the IIR design type. What type are you using? Elliptic? Other? Thanks. -Jeff _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
