Re: [Discuss-gnuradio] Re: FM data available

[Eric Blossom]

On Wed, Feb 19, 2003 at 09:32:02AM +0100, Stephane Fillod wrote:
> On Tue, Feb 11, 2003, Eric Blossom wrote:
> [..] 
> > I've made available 5 seconds of off-the-air broadcast FM data.
> > Carriers for 4 stations can be clearly seen in the FFT.
> > There's a classical station at 5.75 MHz.
> > 
> > The data is 16-bit, little endian, 20MS/s
> 
> Thank you very much Eric for the data file. It works fine!
> I'm able to hear WFM using grig and changing frequencies through the GUI.

Glad to hear it.

> By the way, I have only 256MB of RAM, and my harddrive is not fast
> enough to process data direct-from-disk. So I had to split the file in
> 100MB chunk.
> Sadly enough, my Duron 1GHz is a bit slow too on data crunching, especially
> using generic code for FIR filters. So I wrote fir_SCC optimization (for
> GrFreqXlatingFIRfilter) using 3DNow!Ext, and it improves a bit:
> 
> (address@hidden:examples)$ ./benchmark_dotprod_SCC
>    generic: taps:  256  input: 4e+07 cpu: 107.360  taps/sec:  9.538e+07
>  3DNow!Ext: taps:  256  input: 4e+07  cpu: 29.710  taps/sec:  3.447e+08

Excellent!

> I'll submit a patch when I have regular 3DNow! and SSE done.
> For GrRealFIRfilter, what to you think is best? optimize fir_FSF or use
> fir_FFF with convert_FS ?

I'll get back to you later.

> I have another request for data file.
> Is it possible for you to provide me a data file (16-bit, 20MS/s, size<100Mo),
> containing Narrow FM, USB, and AM. Something like a Ham portion plus
> air-band for the AM would be fine. In need to have data for *each* of
> these modes to be able to test all the demodulators.

I don't have this data.  Perhaps someone else can come up with it.

Eric