Maker Pro
Maker Pro

interesting sounding ultrasound

Is it possible to produce an ultrasound with a varying sound or
pitch... for example, replicating a police siren but at ultrasound
level? What components would I need to produce this varying sound?
 
B

Bob Masta

Jan 1, 1970
0
Is it possible to produce an ultrasound with a varying sound or
pitch... for example, replicating a police siren but at ultrasound
level? What components would I need to produce this varying sound?
You have two issues here: Generating the electrical signal,
and turning it into sound. To create the signal, you can use
any of a number of voltage controlled oscillators (VCOs) and
use a low frequency sine wave as the control voltage. That
will cause the VCO frequency to slide up and down like a
police siren, etc. Note that VCOs tend to have non-sinusoidal
output waveforms, typically ramps or square waves with lots
of harmonics.

The big problem is converting this to sound. For near-audio
frequencies (say, 20 kHz-40 kHz) you can try plastic piezo
horn tweeters. Many have strong output in this range, but
you will not get a flat frequency response... lots of huge
dips and peaks. But its cheap enough to try.

For higher frequencies, transducers tend to be tuned
to specific ranges. You could warble a little within a
given range, I suppose.

If we knew what you plan to do with this, we might
have more-specific suggestions.

Best regards,



Bob Masta
dqatechATdaqartaDOTcom

D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Home of DaqGen, the FREEWARE signal generator
 
Top