The sampling frequency affects the number of measurements per time.
The samplenumber affects the accuracy of the measurements.
The triggerlevel affects the reliability. (different settings are good for different waveforms)
Below the wave-view there is a note-scale with a pointer which shows
the actual frequency. The note scale is lableled in
In the options menu one can adjust the tuning and the note scale.
For natural tuning the base tone has to be adjusted. This is done by
simply clicking at the proper note on the note-scale.
So you can get the saplenumber for a certain accuracy by:
( 1 cent = 1/100 of a halftone step )
However there is also a systematical error (bug) in my program which
can result in a shift of all frequencies by some cent.
For more information check out the next page.
The tuning can be one of the following:
Normal A=440.0 Hz Wien A=435.0 Hz Physical C=16.0 Hz => A=430.5 Hz Furthermore there is the possibility for natural tuning:
Equidistant Normal tuning Natural Tuning by overtones The supported note scales are:
US A,Bb,B,C,Db,D,Eb,E,F,Gb,G,Ab US-Alternate A,A#,B,C,C#,D,D#,E,F,F#,G,G# German A,B,H,C,Db,D,Eb,E,F,Gb,G,Ab German-Alternate A,B,H,C,C#,D,D#,E,F,F#,G,G# 3.2 Accuracy
The accuracy of the frequency measurement depends only on the sample number.
A rule of thumb is:
10000
accuracy[cent] = ----------------
6*samplenumber
10000
samplenumber = ------------------
6*accuracy[cent]
Example:
The accuracy for a samplenumber of 1024 gives
10000/(6*1024) cent = 1.62 cent
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