Hello all Let me try and explain my issue. I have a file source connected to a filter and a scope sink. I see that my scope only displays data if the source file is size x or greater. (around 2100 samples in my case). In cases where the input source file is smaller than x I get a blank (white) scope screen. Can someone explain to me what is going on there? Is there a way to display smaller files? (or do I just have an error in my methodology?) Thanks Jeff ######### ... sps = usrp_rate / options.decim_rate #Setup scopes self.scope1 = scopesink.scope_sink_f(self, panel, sample_rate=sps) self._build_gui(vbox) #Data source files signal_src = gr.file_source(gr.sizeof_gr_complex, options.signal_file) #Filter Signal Data xtaps_signal = gr.firdes.low_pass(1.0, sps, filter_cutoff, filter_transition_width,gr.firdes.WIN_HAMMING) xfilter_signal = gr.freq_xlating_fir_filter_ccf(1, xtaps_signal, offset, sps) self.connect(signal_src,xfilter_signal) c2r1 = gr.complex_to_real() self.connect(xfilter_signal, c2r1, (self.scope1,0)) ...
on 2007-07-10 21:48
on 2007-07-10 21:58
The scope does not display every sample. It only redraws at about 20 or 25 Hz as I remember, and is really only intended for continuous streams of data. Matt
on 2007-07-10 22:15
I guess I have MATLAB on this machine for a reason... Maybe I should use it. Thanks