sound generator

[SlipMatWax]

Is there such a device where sound can be easily generated by entering given SPL in each 3rd octave band (31hz to 8000hz), thereby recreating the same sound profile as equipment manufacturers published test data

 

[dubi123]

I think you need excitation too.
It is different sound when you shape noise with filter bank
and different when you have periodic excitation before filter bank. You could do this numericaly by using
inverse FFT and excitation (some kind of pulses, even basic aproximation of Dirac pulse with unit amplitude).
Excitation should be related to machine speed (like number of revolutions per second). Ford tried something like this to model engine noise in their cars.

Dubravko

 

[TrickyDick]

There are control systems that are primarily designed for high level acoustic chambers that have the functionality you describe. You define the SPL "profile" and the system generates a broadband noise drive signal filtered to the given spectral profile. A microphone feedback signal from the acoustic chamber is fed back to the controller and an adaptive control algorithm changes the drive to create the correct spectral levels at the measurement point(s).

For an example see

http://www.mpiuk.co.uk

under acoustic control

Regards

 

[Emmet]

I think you need to know about the temporal characteristics of the sound as well as the spectral. You can have the same 1/3 octave spectrum but sound very different. Your ability to simulate the sound profile will depend greatly on how well it is defined.

You could easily filter white noise (with a DSP board) to give you the same/similar spectrum as the published data.