hi..
i am working on tx_voice.py and rx_voice.py. I have to capture data directly
from usrp and write onto a file and process that. The problem is that the file
which is made by the data coming from usrp is very big so basically i am not
able to process that. Is there any way by which i can reduce the size of the
file without affecting my audio quality much.
The rates which i am presently using on the tx_voice.py are:
Bitrate- 50,000
samples per symbol - 5
interpolation - 512
Rates which i am using on the rx_voice.py are:
Bitrate- 50,000
samples per symbol - 5
decimation - 256.
Moreover, i have tried using gr.fir_filter_ccf (for decimatio in software)in
the following fashion
chan_coeffs = gr.firdes.low_pass (1.0, # gain
self._samples_per_symbol, #
sampling rate
1.0, # midpoint of
trans. band
0.1, # width of
trans. band
gr.firdes.WIN_HANN) # filter type
self.chan_filt = gr.fir_filter_ccc(sw_decim, chan_coeffs)
and making a connection as
fg.connect(self.u, self.chan_filt, self.packet_receiver)
fg.connect(self.chan_filt,destination)
where destination refers to the file onto which i want to write.Now, this works
fine as long as sw_decim =1. But, if i change the value to 2,4 ,8 or any other
then i dont receive any packet. The file size does change as required (i am
able to observe that as the usrp is always sending data). what i have
understood is that because of the decimation i am missing samples and thus not
able to receive packets.So, can somebody please explain how to get around the
situation.
Thanks for all the help.
Pratik Hetamsaria
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