[music-dsp] fender rhodes tone generator dimensions

[jeffrey traer bernstein]

Yes... it appears that modelling the pickup will be the tricky part...

Another question: tone arms come in 3 varieties based on the key:
1. flat
2. 90 degree twist
3. 90 degree twist and oval hole

I presume these modifications exist to tune the harmonics of the bar 
since an ordinary vibrating bar has somewhat inharmonic partials (1, 
2.756, 5.404, 8.933) How much effect do you think these slight mods 
have? It's pretty hard to tell from crappy sound sample I have since all 
the bar sound is essentially "filtered" by the tine. Anybody have any idea?

jeffyb


James Chandler Jr wrote:

> On Sunday, September 7, 2003, at 06:18  PM, James Chandler Jr wrote:
>
>> If the tine model outputs each sample as Tine Tip instantaneous 
>> location--
>>
>> Using some trig, first calculate instantaneous distance between 
>> TineTip and Pickup...
>>
>> Then calculate velocity as the derivative of Distance...
>>
>> Then PickupOuputVoltage = Velocity / Distance
>>
>> Then apply whatever scaling constant is necessary to get the Pickup 
>> output level into a suitable range?
>
>
> Thinking about it some more, TineTipVelocity probably shouldn't be the 
> derivative of instantaneous distance-to-pickup...
>
> TineTipVelocity probably should be the derivative of the TineTip's 
> position?
>
> If Tine Tip Position is in rectangular coordinates--
>
> DeltaX = TineTipPosX - LastTineTipPosX;
> DeltaY = TineTipPosY - LastTineTipPosY;
> TineTipVelocity = SQRT(DeltaX * DeltaX + DeltaY * DeltaY);
> if (DeltaY < 0.0)
>   TineTipVelocity *= -1.0;
>
> Maybe that's closer, or perhaps it is still wrong.
>
> James Chandler Jr.
>
>
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