Where I was raised (south pole of Mars, IIRC), absent any other reference, a "ratio" of 1:1 was always 0 db. But I can adapt. ChucK is like a box of chocolates -- you never know what you're going to get. - Rob

----- "Perry R Cook" wrote:

...

dB just implies 20log_10. A reference must be selected.

The most common are dBV (1 volt = 0dB), dBm (0dB = 1 milliwatt into 600 ohms), and dBSPL (watts relative to threshold of hearing at 0dB).

I suspect that the implementers of this were thinking about the approximate 96dB of 16 bit audio, and the +/-1.0 float recommended max range of STK. Thus a range of 0.00001=0dB to 1.0=100dB resulted. Easy to change to any reference by just subtracting/adding/multiplying/dividing by a constant.

PRC

---

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Perry;

Oh yea, that too :-)

Thanx Adam.

The link to MIDI would be a nice thing to add to the docs as it will make the reference more clear and immediately increase usability. db is confusing enough as it is and frequently misused (I'm still in the dark on why we would use "A-weighing" on decidedly high volumes as various powers-that-be insist on), by definition it needs a reference. The reference isn't at all clear when we are dealing with floats and the threshold of hearing is determined by the volume of the final amp, the lowest possible value of a double precision float doesn't seem very useful here. Thanks to Adam for clearing up one of the more confusing Std functions; I wasn't sure about that one either. Yours, Kas.