DSP--question properly worded


From: Henry Freedenberg (henryf@quartz.gly.fsu.edu)
Date: Sat Jan 01 2000 - 13:41:23 EST

I didn't proof read my last post. The following adjusted version poses
the question exactly.

I have a serious query for all of the EE's on freq.

DSP works by convolving an input signal with a filter operator. The
output of this operation should be a waveform that only contains
frequencies common to the input signal and the operator.

Let's say my input signal is a 100 hz sine wave (you can autocorrelate
it to save computing overhead) and I design my filter so that it
consists of a wavelet whose only component is 10 hz (you can widen the
filter a bit if you think that ringing will be an issue...the only
requirement is that it not contain 100 hz). When I pass my signal
through the filter (ie convolve the two waveforms), I will definitely
have an output
waveform. What will be the freq content of the output....will it be
sum and difference freqs? Will any of the original freq components show

up in the output?

What am I missing?


Search QRP-L Archives

[ QRP-L Archive | ]
[ 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 ]


This archive was generated by hypermail 2b29 on Fri Jun 02 2000 - 11:43:41 EDT