| TECHNOLOGY |
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| GET IN TOUCH |
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If you want to find out how Intrasonics can help you engage with your audience or customers, then we want to hear from you...
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| How It Works - In Summary |
Intrasonics is the leading technology for embedding inaudible codes in audio and recovering it acoustically. Independent tests by our customers have shown that we consistently out-perform the alternative solutions. |
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Tricking the Human Brain
Intrasonics' technology exploits the way that the human brain processes sensory
information. The brain is extremely good at filtering out irrelevant information, so that it has
less work to do in telling us what we need to know about our immediate environment.
When we hear sound, what we actually hear is not the same as that which would be picked
up by a microphone. In a closed environment, no matter how large, every sound has a direct
path to a listening device (whether an ear or microphone) and a very large number of
indirect paths. These indirect paths are echoes, starting with single and double reflections
off walls and objects but continuing with multiple reflections (reverberations) that taper to
zero in intensity over time.
Our brains are able to filter out the vast majority of natural echoes so that we can
concentrate only on the direct sound paths. If we could suddenly hear all the single, double
and multiple echoes, it would not be very pleasant! Intrasonics exploits the filtering
characteristics of the human brain by using a system of artificial echoes to hide numeric
information.
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Inserting Artificial Echoes into Audio
To create artificial echoes, Intrasonics modifies an audio track in such a way that when
played in an open and flat outdoor space, the tracks would sound to a microphone like there
were real and natural single and double reflections of the sound waves present. To the
human ear, however, the modified audio sounds just the same as the original because the
human brain filters out any extraneous echoes (whether they are real or artificial).
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Embedding Numeric Information (Codes) using Artificial Echoes
Following many years of research, Intrasonics has devised sophisticated digital signal
processing techniques for embedding numeric information (data bits) into audio by adding
artificial echoes.
Intrasonics’ technology embeds the numeric information in N-bit blocks and each of these
blocks is called a trigger code. The process of
inserting codes through artificial echo modulation is called "encoding".
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Extracting Codes from Encoded Audio
Although inaudible to humans and animals (due to the brain’s natural filtering ability), the
artificial echoes inserted into audio during the encoding process are picked up by
microphones such as those on smartphones and tablet devices. Using further digital signal
processing algorithms, artificial echoes are detected and translated back into the
corresponding codes on the mobile device. This process is called "decoding".
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| TRY OUR DEMO APP |
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Step One:
Install our demo app on your iPhone. It's on the Apple App Store: |
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Step Two:
Run the app on your iPhone. |
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Step Three:
Turn on your computer speakers and see what happens when you watch one of our Demo Videos. |
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