Ok, great. This simplifies things; I was afraid I was going to have to create a modulating circuit to modulate those low-frequency timing signals so they could be captured along with the 2 MHz am-modulated signals using a single tuning frequency. I have some questions about the deinterleaver. Firstly, how does it know how many channels are interleaved? Does it determine this information from the Mux settings, or from the number and type of subdevices detected, or something else? Secondly, in terms of computational efficiency, is there any advantage to performing the deinterleave operation earlier in the flow-graph sequence, or later? For example, I'm doing AM demodulation. So, currently my flow graph consists of the usrp block connected to a low-pass filter, connected to a mag block, connected to a high-pass filter (to remove dc), connected to a block that corrects for gain, connected to a block that factors in a "calibration constant" for the data path, and finally the file-write. I also branch off to some fft sinks. Is it necessary for me to introduce a deinterleave block immediately after the usrp block or can I put it anywhere? Thirdly, if all I was doing was capturing to file, is the deinterleaver strictly necessary? I could write a program to deinterleave the data in the file in post-processing, correct? thanks! eric
on 2007-06-01 18:17
on 2007-06-05 05:37
Dear Ematlis, I want to draw your attention to this remake: When using std_4rx_0tx.rbf FPGA file, the 4 FPGA DDCs does not have low pass filter (the HBF) and you have to do the low pass filtering by software. Firas, ematlis wrote: > many channels are interleaved? Does it determine this information from > mag > strictly necessary? I could write a program to deinterleave the data in >>> different subdevices to different frequencies, is there one LO on the >> u.tune(...) handles adjusting the LO (if any) and the DDCs >> that are being fed from the given daughterboard. You of course need >> Yes, the decimation rate applies to all subdevices. > _______________________________________________ > Discuss-gnuradio mailing list > Discussemail@example.com > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- View this message in context: http://www.nabble.com/multi_file-usrp-tuning-optio... Sent from the GnuRadio mailing list archive at Nabble.com.