[ntp:questions] measuring frequency

robert bristow-johnson rbj at audioimagination.com
Tue Feb 12 08:25:15 UTC 2013


On 2/11/13 6:48 PM, unruh wrote:
> ["Followup-To:" header set to comp.protocols.time.ntp.]

why do that?


hey guys, fix the Newsgroup: header here.

On 2/11/13 6:48 PM, unruh wrote:
 > ...
 > Yes. However what you can do is to filter out the all but the strongest
 > harmonic, and count which harmonic number it is.

how do you know what the harmonic number is?  how would that information 
be determined in the general case.


 > Then you know how many
 > zero crossings it has in an period of the fundamental and can count
 > them.
 > Of course with the piano, since they are not harmonically related this
 > will give a small error. However the lowest ones are not too far out,
 > (and besides the ear the actually uses all of the harmonics to decide on
 > the pitch it will present to you).

well, the frequencies of the higher harmonics are a little sharp.  i 
think that affects the perceived timbre of the sound but not so much the 
pitch.

-- 

r b-j                  rbj at audioimagination.com

"Imagination is more important than knowledge."





-- 

r b-j                  rbj at audioimagination.com

"Imagination is more important than knowledge."




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