What is a tone decoder?

The tone decoder is a device that can interpret audio frequencies and their wavelengths on phones and other digital tone devices. They have been used since the at least sixties. One of their first uses was telephone operators who helped clients call long distances. They can also be used as a signal for local advertising cable television and as a device for spying when watching calls from and on the phone. Since the telephone tone has two frequencies, it is known as dual tone multifrequency or DTMF tone. There are 16 tones that can be used with this technology, but usually the phone uses 12. The tone decoder works by reading low and high frequencies and pairing to identify the tone. Allows call generation using the buttons that are pressed. Once the button is pressed, the decoder takes over the information from the button by pressing and sends the correct signal in the form of a tone to complete the call.

There are several other uses for tone decoder technology. One practical use can be observed in the identification unit - the unit shows a number called by decrypting the tones that are sent from this number. Furthermore, emergency staff, such as firefighters, often use this technology to monitor the scanner radio for unique tones broadcast from places such as firehouse, and calls them to respond to an emergency.

Radial fans or anyone else who might be interested can build a tone decoder with several simple parts at very low costs. Sometimes students do them as a scientific experiment or project. Once they are made, they have many practical uses. If it is connected to the phone, with some additions of the device can be used to turn them on and off light, radio and many other appliances from a remote location.

in espionage-sometimes avoid detection but also pRO providing useful information-the place of other intelligence collection devices is used by the tone decoder. Tone decoders can detect a busy signal as well as incoming or outgoing phone numbers. This can provide a person tracking a line information, such as often called numbers and how often the phone is used.