I'm currently attempting to detect the level of the 66kHz component
of an arbitrary signal using an 56F8323, I was hoping that I could
sample the signal using the ADC (taking say 512 samples) and then
perform an FFT on these samples to give me another set of values
that relate to the frequency spectrum. I could then simply check the
value that corresponds to 66kHz.

Being new to DSP and not knowing too much about FFT's I don't know
if this is possible or if I am being over simplistic. Is an FFT the
best way of detecting the 66kHz component? Any advice, tips or
examples would be gratefully received.

Cheers

Mike

Reply by Ebersman, Howard●June 28, 20042004-06-28

For picking off a single tone, the Goertel algorithm is a much better
choice for processing efficiency. You can dig up info on the web, or in certain
communications textbooks.

An FFT will work too, and is much easier to find code for. The # of FFT
points will determine the range of frequencies that will contribute energy to
the bin. i.e. more bins = narrower frequency resolution. FFT code is easy to
write if you don't care about efficiency (i.e. speed of execution). There are a
million people who have written FFT code, and some Motorola
family/user manuals have it in the back of the book.

Howard

-----Original Message----- From: mickmonx
[mailto:m...@monx.co.uk] Sent: Sunday, June 27, 2004 5:12 PM To: m...@yahoogroups.com Subject: [motoroladsp] FFT's and
signal detection

Hello all,

I'm
currently attempting to detect the level of the 66kHz component of an
arbitrary signal using an 56F8323, I was hoping that I could sample the
signal using the ADC (taking say 512 samples) and then perform an FFT on
these samples to give me another set of values that relate to the
frequency spectrum. I could then simply check the value that corresponds
to 66kHz.

Being new to DSP and not knowing too much about FFT's I
don't know if this is possible or if I am being over simplistic. Is an FFT
the best way of detecting the 66kHz component? Any advice, tips or examples would be gratefully received.

Cheers

Mike

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Reply by Estevam Fabio-R49496●June 28, 20042004-06-28

Just
correcting the name of the algorithm: "Goertzel algorithm"

Best
regards,

Fabio
Estevam

-----Original Message----- From: Ebersman, Howard
[mailto:H...@microwavedata.com] Sent: segunda-feira, 28 de junho de
2004 10:22 To: 'mickmonx'; m...@yahoogroups.com Subject:
RE: [motoroladsp] FFT's and signal detection

For
picking off a single tone, the Goertel algorithm is a much better choice for
processing efficiency. You can dig up info on the web, or in certain
communications textbooks.

An FFT will work too, and is much easier
to find code for. The # of FFT points will determine the range of frequencies
that will contribute energy to the bin. i.e. more bins = narrower frequency
resolution. FFT code is easy to write if you don't care about efficiency (i.e.
speed of execution). There are a million people who have written FFT code, and
some Motorola family/user manuals have it in the back of the
book.

Howard

-----Original Message----- From: mickmonx
[mailto:m...@monx.co.uk] Sent: Sunday, June 27, 2004 5:12 PM To: m...@yahoogroups.com Subject: [motoroladsp] FFT's and
signal detection

Hello all,

I'm
currently attempting to detect the level of the 66kHz component of an
arbitrary signal using an 56F8323, I was hoping that I could sample the
signal using the ADC (taking say 512 samples) and then perform an FFT on
these samples to give me another set of values that relate to the
frequency spectrum. I could then simply check the value that corresponds
to 66kHz.

Being new to DSP and not knowing too much about FFT's I
don't know if this is possible or if I am being over simplistic. Is an FFT
the best way of detecting the 66kHz component? Any advice, tips or examples would be gratefully received.

Cheers

Mike

_____________________________________ Note: If
you do a simple "reply" with your email client, only the author of this message
will receive your answer. You need to do a "reply all" if you want your
answer to be distributed to the entire group.

_____________________________________ About this discussion group:

_____________________________________ Note: If you do a simple
"reply" with your email client, only the author of this message will receive
your answer. You need to do a "reply all" if you want your answer to be
distributed to the entire group.

_____________________________________ About this discussion group: