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[Discuss-gnuradio] File source woes

From: John Bratteli
Subject: [Discuss-gnuradio] File source woes
Date: Thu, 5 Jul 2007 11:13:45 -0700 (PDT)

I'm attempting to write a script, based on
usrp_fft.py, that will read a file of gr_complex and
display it.  It works, except that it plays back much
faster than it was recorded.  For example, I recorded
a five second file and gave it to my script.  It
looked to be correct data, but it finished playback in
less than a second.  Here's the essential code:

self.input = gr.file_source(gr.sizeof_gr_complex,
options.filename, options.loop)

adc_freq = 64e6 #inherent to USRP
decim_rate = float(options.decim) #whatever decimation
rate used in recording

input_rate = adc_freq / decim_rate

self.scope = fftsink.fft_sink_c(self, panel,
fft_size=1024, sample_rate=input_rate)

self.connect(self.input, self.scope)



Any help would be greatly appreciated.

John Bratteli

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