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Maximum slew rate typically found in music/voice

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gf:

--- Quote from: Nominal Animal on September 15, 2023, 11:18:54 pm ---...and the slew rate is the magnitude of its derivative with respect to time,

--- End quote ---

:-+ And I also don't see why the relation tr = 0.35 / BW would apply here, which is rather the 10%...90% risetime of the step response of a Gaussian filter with a given -3dB bandwidth. This waveform is not a sine wave, but the integral of a Gaussian bell.

HalFoster:

--- Quote from: BrianHG on September 15, 2023, 07:00:06 pm ---
--- Quote from: tggzzz on September 15, 2023, 06:47:03 pm ---The question is ill-formed. The slew rate is a function of frequency and amplitude.

A 1kHz 100V signal has a slew rate 10 times higher than that of a 1kHz 10V signal.

--- End quote ---
I was getting to that....
What if you have a 1kv or 1 megavolt driver amp?  What happens to the slew rate?

--- End quote ---

That... is very true.  Instead of slew rate the term should have been rate of change or rather DV/DT.  I was thinking of how to get to a usable slew rate requirement and skipped a term.  Mea culpa.

HalFoster:
So a clearer question would be: In any average live musical or voice performance what would be the highest DV/DT of a natural waveform encountered and what instrument/voice would be the most likely to generate it.  Naturally ignoring any random interference patterns or such. 

I was looking for an answer like "A <some type of cymbal>  often generates a DV/DT of 200 V/uS on initially being struck." or somesuch.

I really wasn't looking to get too complicated with this, I just thought that someone, somewhere, would have done this research and might have published it somewhere. 

Hal

tggzzz:

--- Quote from: HalFoster on September 16, 2023, 12:21:03 am ---
--- Quote from: BrianHG on September 15, 2023, 07:00:06 pm ---
--- Quote from: tggzzz on September 15, 2023, 06:47:03 pm ---The question is ill-formed. The slew rate is a function of frequency and amplitude.

A 1kHz 100V signal has a slew rate 10 times higher than that of a 1kHz 10V signal.

--- End quote ---
I was getting to that....
What if you have a 1kv or 1 megavolt driver amp?  What happens to the slew rate?

--- End quote ---

That... is very true.  Instead of slew rate the term should have been rate of change or rather DV/DT.  I was thinking of how to get to a usable slew rate requirement and skipped a term.  Mea culpa.

--- End quote ---

Since slew rate is dV/dt, you haven't changed anything - the question is still ill-formed.

The necessary slew rate and dV/dt both depend on the waveform's amplitude

T3sl4co1l:
Cymbals emit audio waves, not voltage; the question isn't meaningful.  Through a transducer system (microphone and speakers), the voltage and therefore slew rate or dV/dt is proportional to the peak level, which is arbitrary: it might be 3V at line level, it might be down in the noise floor (<1µV?) if turned down/muted, or it might be thousands of volts on a powerful loudspeaker system (or some specialty types like electrostatic speakers).

The question you meant to ask, is frequency response, and that is easily answered: the ear is sensitive to up to 20kHz or so, typically, so that's all that we care about.  Sound sources can go higher, but there isn't much point in preserving that information for human consumption at least.

And since such an oscillation can be full-scale, the slew rate still depends on line level or whatever, but several to low 10s of V/µs is typical for such equipment.

Tim

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