**Intelligent beings** would develop
transmitters and receivers,
and come to understand modulation and digital
communications,
and they would eventually utilize digital communications
extensively.
As codes with good correlation properties
are **essential** to effective
and efficient digital communications,
no doubt their transmissions would use Barker and Gold code
sequences,
as there are only a few codes that have good correlation
properties.
The best way to detect intelligent civilizations
is to auto-correlate
signals using these **few** code sequences.
Advance civilizations would also use the most effective compression
algorithms,
and their signals could be decoded by using the best compression
algorithms.
If you want to detect **intelligent life**,and find out what they are
interested in,
you should:
1. Scan the skies using high gain antennas and low noise receivers
and
record the signals.
2. Run cross-correlations on all of the data
using the set of Barker and
Gold code sequences.
3. When signals are found,
use advanced MP3 and MP4 type decoders
to
extract the encoded data.
The bottom line is that **Intelligent beings**
would end up using
digital communications
using the few good code sequences that exist,
and they would also compress the information
using the most
efficient compression algorithms.
We know what the code sequences,
and we probably know what the best
compression algorithms are.
If signals from outer space contain
Barker and Gold code
sequences,
we know we are intercepting signals from **Intelligent
beings**
and then we have to play around with the compression
to find out what
they are saying.
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