Thanks for the new function. I am also interested in a CTCSS function.
Couldn't we take the output of your new goertzel_dft function, pick out the particular frequency bin we are interested in by using stream_to_streams and then pass that to the existing power_squelch function? If this makes sense, I am having trouble converting the output of the goertzel_dft function into separate frequency bin streams. Any suggestions would be appreciated. Regards, Tom Rychener -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Johnathan Corgan Sent: Sunday, June 25, 2006 12:59 PM To: gnuradio mailing list Subject: SPAM-LOW: [Discuss-gnuradio] Geortzel DFT implementation checked in Checked in to CVS are a C++ implementation and stream processing block for the Goertzel single-bin DFT transform. The C++ class constructor takes the sample rate, length of the Goertzel block, and the frequency of the bin of interest: gri_goertzel::gri_goertzel(int rate, int points, float freq); The frequency does not have to be "centered on a bin" such as when doing a standard DFT. By calling the dft member function with a pointer to an array of floats, one receives the real and imaginary parts of the DFT transform of the array for the frequency specified in the constructor: gr_complex gri_goertzel::dft(float *input); Wrapped around this is a signal processing block that accepts a real-valued stream of floats and outputs a complex stream of DFT outputs, at a rate equal to the input rate / length of the Goertzel transform: gr.goertzel_fc(rate, points, freq) Basic testing with a variety of inputs shows correct functioning but no automated QA script is in place yet. The C++ class will be used as part of the planned gr.ctcss_squelch() block. -Johnathan, AE6HO _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
