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Question for Robert Scott #2576471
10/05/16 08:33 PM
10/05/16 08:33 PM
Joined: Jan 2010
Posts: 3,087
Montreal, Quebec, Canada
Mark Cerisano Offline OP
3000 Post Club Member
Mark Cerisano  Offline OP
3000 Post Club Member

Joined: Jan 2010
Posts: 3,087
Montreal, Quebec, Canada
Hi Robert,

There's been some reference here and on PTI about ETDs and how they work.

I maintain that there is some dampening that must go on in the algorithm to deal with the noise and the fluctuations of the string when reading it.

Without giving away any details on how Tunelab works, am I in the ballpark?

Mark Cerisano, RPT, B.Sc.(Mech.Eng), Dip.Ed.(Music)
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Re: Question for Robert Scott [Re: Mark Cerisano] #2576510
10/05/16 11:28 PM
10/05/16 11:28 PM
Joined: Dec 2003
Posts: 348
Robert Scott Offline
Full Member
Robert Scott  Offline
Full Member

Joined: Dec 2003
Posts: 348
Mark, there is no explicit dampening to smooth out pitch variations in ETDs, but dampening does occur implicitly. In TuneLab for example, the Spectrum Display is updated about 3 times per second. On each update, the pitch of the string may be varying during that 1/3 of a second time period, but the spectrum calculation inherently forms an average picture of the pitch during that time period. Going from one update to the next, there is no averaging. So any pitch variations that occur slowly enough to be different from one update to the next will be reflected in a change in the location of the graphical peak.

The Phase Display is a little different. It doesn't actually measure pitch. It measures phase. A changing phase is equivalent to a pitch offset, much like aural beat detection. That display updates at a faster rate than the Spectrum Display, so it is more sensitive to shorter term pitch variations. An unstable string will result in an jiggling pattern. However the real job of smoothing the Phase Display happens in the eyes and the brain of the user. Even if the display is jiggling, your eyes can discern an average pitch offset by tracking the overall movement of the pattern. The longer you wait to make this determination, the more smoothing you are applying. But the ETD doesn't do that smoothing. You do.

Robert Scott
Hopkins, Minnesota

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