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All of my DSP experience is very much centred in the EM spectrum and I've only ever processed EM-type signals in the past.

I'm now doing quite a bit of work in ultrasound and the audio spectrum, but a lot of the techniques I'm using are used in the EM mainly. I'm reading a lot of EM papers about DSP at much higher frequencies. Can I expect that the principles behind these techniques will behave in the same way, even though the medium of transmission is different?

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Many of the ideas will be similar, but some assumptions may no longer apply. For instance many signals in EM can be treated as Narrowband (narrow bandwidth with respect to the centre frequency), in Ultrasound you may run into Broadband signals more easily. Another problem you may run into is the speed of propagation varies as a function of frequency.

Exactly what difference you encounter will depend on your experiences with EM and what exactly your are doing in ultrasound.

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  • $\begingroup$ Your remarks about bandwidth are correct and important. There is some wideband EM technology, too, but this is rather special. Eg. Wi-Fi is rather broadband by design, but then you rarely would try to do DSP with Wi-Fi. You'd probably rather buy the right cores and hardware. $\endgroup$
    – user7358
    Commented Jan 8, 2014 at 1:45
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Yes. However, depending on frequency, there might not be hardware that's fast enough.

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