On Sun, Feb 08, 2009 at 07:36:28PM -0500, Ran Tian wrote: > HI, > Could anyone help me with noise level Estimation using the GNU Radio block > gr.null_source (float [gr_complex]) > I just want to send a constant zero signal an drecord the output. > How to write this simple flow graph?
Probably best not to write it at all. Just assign a variable the value 0. If you use this as an estimator, it will have exactly the same mean and variance as the null source [1]. But seriously, I assume you mean something else. I recommend reading http://gnuradio.org/trac/wiki/Tutorials/WritePythonApplications that, should cover the basics (assuming you want to use Python). Martin [1] They are both zero, by the way. -- Dipl.-Ing. Martin Braun Phone: +49-(0)721-608 3790 Institut fuer Nachrichtentechnik Fax: +49-(0)721-608 6071 Universitaet Karlsruhe (TH) http://www.int.uni-karlsruhe.de/
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