Terahertz radiation and acoustic beams can offer fundamental communication tools.

 Terahertz radiation and acoustic beams can offer fundamental communication tools. 

Terahertz radiation is key to fundamental communication. 

Things like ECM (Electronic Counter-Measure)-systems can be used to disturb. And even deny radio frequency-based communication. This is the reason why researchers are investigating replacements for radio-based communication. Also, things like solar wind affect high-speed radio communication. 

Also, the plasma field can deny entire radio communication. This is the reason why researchers are seeking a replacement for radio waves. The optical and acoustic systems are less vulnerable to plasma-based countermeasures. 

The is two different type of systems that can transmit data through air with very high accuracy. The first system uses terahertz lasers for data transmission. The terahertz-laser communication base technology connects terahertz sensors and terahertz lasers. The terahertz laser can send information through walls. 

We know that terahertz scanners see through walls. But communication tools can use that radiation. The reason why we use radio frequencies for communication is that radio waves can travel through the walls. Terahertz laser can also transmit information through the wall without causing damage. 

And the very highly accurate data transmission makes it very hard to steal data from that beam. In some systems, the laser ray that transports information is inside another hollow laser ray. The hollow laser ray denies outside sensors to see information transporter laser. 

That makes it almost impossible to steal information from the laser ray. And the receiver sees if something cuts the protecting laser ray. 

The acoustic very accurate communication systems are also less vulnerable to EM-based jamming. The system uses LRAD (Long Range Acoustic Device) for binary data communication. 

The solution for the binary system's zero-problem where the system must separate breaks between "zeros". From a situation where the system shuts down. 

In regular binary computing systems break means "empty" or "zero" 0. And when electricity is on that means "one" 1. The "zero" is a problem in binary computing because that empty break can mean that the operator turns off electricity.  

There is the possibility to make the data handling process more effective by replacing "zero" with some other frequency. In that case, infrasound can mean zero and ultrasound can mean one. This thing makes changes between one and zero more effective. And the breaks between infrasound signals can separate "zeros" from each other. 

In so-called coherent acoustic wave communication:

Infrasound can mean 0 (zero)

Ultrasound can mean 1 (one). 

The acoustic data transportation systems can have high-speed communication capacity. Sending data through the air by using acoustic beams can be very fast. In binary communication, the acoustic system can use two frequencies. 

The infrasound can be 0, and the ultrasound can be zero. That thing means that the system replaces pause which means 0 or "empty" by using a certain frequency. And in our example systems, the infrasound replaced "empty" or 0. And ultrasound means 1 (one). 

Acoustic systems are also promising tools to transport information through air. The acoustic data communication systems use acoustic beams that LRAD systems are making. The acoustic "lasers" are very accurate systems that also can transport data. 

Those systems can operate in ultra- and infrasound areas. So normally people do not hear them. Those LRAD systems can targeted to microphones at the roof level, and a very high-accurate acoustic beam makes it possible that the high-accurate acoustic beam doesn't disturb people and things dogs. 

https://en.wikipedia.org/wiki/Long-range_acoustic_device