[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Discuss-gnuradio] MRFM (Magnetic Resonance Force Microsocopy) andG
Re: [Discuss-gnuradio] MRFM (Magnetic Resonance Force Microsocopy) andGNU Radio
Sat, 03 May 2008 10:43:48 -0500
> The UW Quantum System Engineering Laboratory has written
> code for Magnetic Resonance Force Microscopy (MRFM).
> The code is available from
> 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
implemented a 4th order IIR filter? If so that would mean somewhat non-linear
depending on the IIR design type. What type are you using? Elliptic? Other?