No reason. Just scribbled up a quick flowgraph to demonstrate the use of a computer's microphone and speakers to do audio frequency DSP with gnuradio.
On Fri, Oct 21, 2016 at 1:56 PM, Garver, Paul W <garv...@gatech.edu> wrote: > I'm not familiar with your application. But you would get better frequency > resolution for the same length FFT if you decimate after the BPF. It would > probably be easier to see what is going on. Is there a reason you are > significantly oversampled? > > Paul Garver > > >> On Oct 21, 2016, at 3:31 PM, Chris Kuethe <chris.kue...@gmail.com> wrote: >> >> I've been meaning to do some more experimentation here using CW, FMCW, >> and chirps. >> >> You should be seeing a bright line down the middle of the waterfall. >> If not, your hardware isn't working - I'm thinking it's your speakers >> since you do seem to be gettting *something* from the microphone on >> your FFT. You won't hear the tones since they're ultrasonic, but is >> your sound muted? >> >>> On Fri, Oct 21, 2016 at 10:01 AM, Steve Gough <sgough1...@gmail.com> wrote: >>> Hi All, >>> >>> I am interested in analyzing the doppler shift of a transmitted signal. >>> >>> As a first step, I want to see if I can capture hand movements in a >>> Waterfall sink for an audio signal (tone). For that I use a flow graph like >>> the attached screenshot based on >>> https://github.com/ckuethe/gnuradio-examples/tree/master/doppler_sonar and >>> https://www.youtube.com/watch?v=9trGfdcMPtk&noredirect=1. >>> >>> I don't observe any doppler shift when I move my hand/walk in the vicinity. >>> I can see the FFT plots change in shape on motion, but nothing is observed >>> on the Waterfall sink. >>> >>> Could you please tell me if I am missing something here? >>> >>> The observed waterfall spectrogram is also attached. >>> >>> Thanks, >>> Steve >>> >>> _______________________________________________ >>> Discuss-gnuradio mailing list >>> Discuss-gnuradio@gnu.org >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>> >> >> >> >> -- >> GDB has a 'break' feature; why doesn't it have 'fix' too? >> <Screenshot_2016-10-21_12-46-58.png> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio -- GDB has a 'break' feature; why doesn't it have 'fix' too? _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
