What are the different types of devices for sound?

There are many types of audio tracking devices, but fall into two wide categories of distant and physical categories. Naleries and some other types of listening devices require an eavesdropper to be physically present at some point. Other forms of sound supervision are carried out remotely, through "errors" or by subversion of existing technologies that use wireless. Before the wireless phone technology was invented, the creation of an electrical connection between the subject's telephone and the tracking team could be listened to in real time. This connection was called "Tap".

When the wireless technology increases, all telephone conversations are monitored by computer. Telephone companies can let their computers make a "digital switch" where the sound of the conversation is copied to the second line. Although it is done remotely, this type of sound supervision is still called "eavesdropping" and is almost impossible to follow.

youAdhesive listening devices are a more practical form of sound tracking device. More advanced versions of holding a drink to the wall, these microphones are designed to hear through the walls and the eavesdropper must be physically in the same building as the object to be placed. Many of these devices consist mainly of powerful microphone and headphones.

Error is another common form of sound supervision. BUGS are small microphones equipped with radio waves. They can be hidden almost everywhere. In 1950, the mistake was included in the wooden replica of the Great Seal, which the Government of the United States used to bake documents and Russia was provided in friendship to the US Ambassador. It was not discovered only ten years later.

miniature recorders are also readings available forms of sound tracking device. Like errors, they can be hidden in an innocent objectech, such as pens or flaps buttons. Such devices can be purchased via the Internet, but the laws differ how legal it is to own.

6 The Federal Office for Investigation (FBI) in the US is supposed to turn on a mobile phone technology in a subject's pocket. The agents are then able to listen to the conversations that take place around. This method is called Roving Bug.

In 2003, the Internal Revenue Service (IRS) discovered a way to listen to conversation through an emergency tracking system. The US Court of Appeal banned this method of supervision for the ninth circuit because it deactivated all car security systems.