On Thu, Feb 9, 2012 at 12:47 PM, anay tuljapurkar < anay.tuljapur...@gmail.com> wrote:
> Hey, > > Apologies if this is a duplicate but i found this is my drafts while > i thought i got delivered. > > I having been trying to debug my demodulator for a few days now and > in due process i receive the following error message. > > ValueError: itemsize mismatch : dbpsk_demod(5):0 using 1, sub_ff(15):0 > using 4. > > Now there are two things that i observed. > 1) With the connect statement of these two at hand , sub_ff is expecting 4 > float bytes which is only connected to "1 byte/sample" output by the > dbpsk_demod block. > > 2) The output of the dbpsk_demod block (according to the line -- > > io_sig_out = gr.io_signature(1,1,gr.sizeof_char) .. so its a > dbpsk_demod_complex->character conversion where as the sub_ff is a "float > --> float " . > > My question is will a custom "gr_dbpsk_demod_cf" with a cosine > function(that possibly uses a certain kind of cosine table) be useful to do > the following : > > 1) keep the constellation in check (i.e 1 bit/symbol) at 0 and 180 degrees > respectively. > 2) ofcourse convert a complex to float. > 3) How effective would such a cpp block be as opposed to a full fledged > python block ? > > Thanks & regards, > Anay. > Anay, It's not clear what you really want to do here. If you want to work on the samples as floats, you could probably just edit the Python hier_block2 file for what you want (or create a duplicate for your needs). Tom
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