×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

sound generator

sound generator

sound generator

(OP)
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

RE: sound generator

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

RE: sound generator

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 www.mpiuk.co.uk under acoustic control

Regards

RE: sound generator

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.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources