Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!snorkelwacker!bloom-beacon!eru!hagbard!sunic!news.funet.fi!funic!fuug!hemuli.tik.vtt.fi!mattila
From: mattila@hemuli.tik.vtt.fi (Sakari Mattila)
Newsgroups: comp.dsp
Subject: Re: Practical DSP problem
Message-ID: <5169@hemuli.tik.vtt.fi>
Date: 8 Oct 90 12:47:41 GMT
References: <3575@syma.sussex.ac.uk>
Organization: Technical Research Centre of Finland, Laboratory for Information Processing (VTT/TIK)
Lines: 15


 
On finding a sine wave of known frequency buried in noise ...
 
If you know the phase of the sine, how about summing it for some
tens or even thousands of cycles ?  If you do not know the phase,
how about programming a PLL (Phase Locked Loop) ?  PLL is good
at finding the signal, if the signal is stable in frequency and
phase. If your signal is variable, try to filter it out of the noise.
 

 
-- 
Sakari M. Mattila    71307.1525@CompuServe.COM
                     mattila@tik.vtt.fi    Sakari Mattila@3:663*371.0.FNET