In message <[EMAIL PROTECTED]>, "Ulrich Bangert" writes: >> All the repeated steps of amplification/limiting to find the = >> zero crossing can be almost entirely replaced by a a single FFT. > >If dsp methods are a choice one can even do better (at least for simple >sines) as described by Mr. Greenhall in > >www.tmo.jpl.nasa.gov/progress_report/42-121/121G.pdf > >The clue here is that not only the zero crossings and its surroundings >are used for interpolation but ALL samples are used for a comlete signal >reconstruction and noise removement. For a simple sine this is of course >easier done as for the more complex Loran-C signal. =
That is exactly what the FFT does for you. Loran-C is not that much more tricky, it has a well defined frequency spectrum as well. Not as simple as a sine-wave, but well defined all the same. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [EMAIL PROTECTED] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
