Listening device, as the last century, the rapid development of electronic technology emerge, and constantly miniaturization and precision of. Currently, a wide range of listening devices, or volume of small (or even less than 1 m), or camouflage strong, can be hidden in any object, such as: telephones, watches, pens, necklaces, various office supplies, supplies , and so on, perhaps a stone or roadside tree branches section is a camouflaged wiretapped.
Cable tapping
Cable eavesdropping is the use of objective existence of the "line" to the goal of intercepted information. "Line" refers to telephone lines, telecommunications cables, closed-circuit television lines, network cable, power lines or pre-burial tapping dedicated line, and so on. Tel modern society is the most extensive communications tool. Now, all countries in the world basically built an automatic telephone network nationwide. Telephone metaphor for the modern society "nervous system" is not an exaggeration. However, because telephone communication is so important, all kinds of information over the telephone may transfer. Therefore, a wireline telephone access to spy an important channel for information. The most typical is the 1972 phone-tapping of the Watergate scandal.
Voice eavesdropping
Voice listening device is a high-sensitivity, at the strong directional microphone Stethoscope and low-noise electronic equipment combination. In the next few hundred meters away from the direct surveillance target voices heard. "Stethoscope listening device" high sensitivity microphone affixed to the wall through dozens of centimeters thick walls of the room to hear other voices.
Radiation eavesdropping
A time, one hung a blue Embassy brands of cars out on time every day Embassy, parked in a highway repairs, on time back two hours later embassy. This abnormal behavior caused by the authorities in the country against special attention. Agents designed a car accident, dressed as police check on the cars were found, the car roof material is a paint spraying glass inside a large coil and electronic circuits. In fact, this is a listening device, and wiretap targets set up along highways was that the telephone carrier. In the blue sedan is how bugging devices? In fact, use of carrier telephone carrier communications technology in the communication lines in order to make a multi-way call at the same time, it will be all of the letter-users respectively modulation signal to a different frequency, then its receipt - separate, modulation, respectively corresponding to the user there. In order to accommodate the multi-channel signal, telephone carrier high frequency signal transmission in the transmission process will inevitably radiation to the surrounding space in the Stethoscope line. These large coil with radiation received from the airwaves, after demodulation, will be listening to the content of telephone carrier. Eavesdropping is radiation such eavesdropping.
Wireless eavesdroppers
Cable and Wireless tapping tapping different. It does not require a specialized metal wire tapping the signal transduction out, as long as the installation of the listening device, a radio transmitter and a transmitting antenna, we will be able to eavesdrop signal from the air by the launch. However, the emissions must be used within the coverage area of the corresponding frequency of a radio receiver to receive these signals, to complete eavesdropping. The summer of 1914, when the First World War, in northern France in a secluded garden, parked one of the Baby Bells Chandrika caravans. British car installation of the Military Intelligence Bureau was the most advanced radio ore close at listening device, use it to eavesdrop neighbouring Germany army radio contact with the signal. Along with the development of science and technology, to the 1950s, called a "scorpion" micro-radio listening device had come out. The volume ratio of small matchbox also can be used air pistols to launch it, adhesion in the outer wall of any building. It's like geckos adsorbed on the wall, eavesdropping can be clear to each of the minor indoor sound, and these voices into the airwaves, after amplification Stethoscope circuit, and then to launch FM, and in the 8,000 m in diameter within the scope of FM receiver Machine on these waves can be recorded and used to decode typewriter tapping the content of the print out, forming documents. The last century to the early 1980s, a more advanced method of "listening device bullets" come out of. Its shape is no different from ordinary bullets, but it is within the shell fitted with a super-tiny UHF or launchers. The use of micro-assault rifles to launch it, and then put on the ultra-high-frequency electronic receivers headphones, we can hear distant enemy dialogue. Once in a foreign military exercises in the use of such bullets just tapping into trial production, is clearly heard in the distance hidden mountain valley Fubing air at the low dialogue.
Cable tapping
Cable eavesdropping is the use of objective existence of the "line" to the goal of intercepted information. "Line" refers to telephone lines, telecommunications cables, closed-circuit television lines, network cable, power lines or pre-burial tapping dedicated line, and so on. Tel modern society is the most extensive communications tool. Now, all countries in the world basically built an automatic telephone network nationwide. Telephone metaphor for the modern society "nervous system" is not an exaggeration. However, because telephone communication is so important, all kinds of information over the telephone may transfer. Therefore, a wireline telephone access to spy an important channel for information. The most typical is the 1972 phone-tapping of the Watergate scandal.
Voice eavesdropping
Voice listening device is a high-sensitivity, at the strong directional microphone Stethoscope and low-noise electronic equipment combination. In the next few hundred meters away from the direct surveillance target voices heard. "Stethoscope listening device" high sensitivity microphone affixed to the wall through dozens of centimeters thick walls of the room to hear other voices.
Radiation eavesdropping
A time, one hung a blue Embassy brands of cars out on time every day Embassy, parked in a highway repairs, on time back two hours later embassy. This abnormal behavior caused by the authorities in the country against special attention. Agents designed a car accident, dressed as police check on the cars were found, the car roof material is a paint spraying glass inside a large coil and electronic circuits. In fact, this is a listening device, and wiretap targets set up along highways was that the telephone carrier. In the blue sedan is how bugging devices? In fact, use of carrier telephone carrier communications technology in the communication lines in order to make a multi-way call at the same time, it will be all of the letter-users respectively modulation signal to a different frequency, then its receipt - separate, modulation, respectively corresponding to the user there. In order to accommodate the multi-channel signal, telephone carrier high frequency signal transmission in the transmission process will inevitably radiation to the surrounding space in the Stethoscope line. These large coil with radiation received from the airwaves, after demodulation, will be listening to the content of telephone carrier. Eavesdropping is radiation such eavesdropping.
Wireless eavesdroppers
Cable and Wireless tapping tapping different. It does not require a specialized metal wire tapping the signal transduction out, as long as the installation of the listening device, a radio transmitter and a transmitting antenna, we will be able to eavesdrop signal from the air by the launch. However, the emissions must be used within the coverage area of the corresponding frequency of a radio receiver to receive these signals, to complete eavesdropping. The summer of 1914, when the First World War, in northern France in a secluded garden, parked one of the Baby Bells Chandrika caravans. British car installation of the Military Intelligence Bureau was the most advanced radio ore close at listening device, use it to eavesdrop neighbouring Germany army radio contact with the signal. Along with the development of science and technology, to the 1950s, called a "scorpion" micro-radio listening device had come out. The volume ratio of small matchbox also can be used air pistols to launch it, adhesion in the outer wall of any building. It's like geckos adsorbed on the wall, eavesdropping can be clear to each of the minor indoor sound, and these voices into the airwaves, after amplification Stethoscope circuit, and then to launch FM, and in the 8,000 m in diameter within the scope of FM receiver Machine on these waves can be recorded and used to decode typewriter tapping the content of the print out, forming documents. The last century to the early 1980s, a more advanced method of "listening device bullets" come out of. Its shape is no different from ordinary bullets, but it is within the shell fitted with a super-tiny UHF or launchers. The use of micro-assault rifles to launch it, and then put on the ultra-high-frequency electronic receivers headphones, we can hear distant enemy dialogue. Once in a foreign military exercises in the use of such bullets just tapping into trial production, is clearly heard in the distance hidden mountain valley Fubing air at the low dialogue.