The only biometric technology which does not measure the visual features of the human body. In voice recognition the sound vibrations of a person is measured and compared to an existing sample. The person to be identified is usually required to pronounce a designated password or phrase which facilitates the verification process. Voice recognition can be used on the phone, but has the weakness of technology is its susceptibility to interference by background noise.
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GCHQ is the British Government Communication Headquarters, which is in fact an electronic monitoring centre which intercepts communications using spy satellites, listening devices and code-cracking equipment. The 1994 Intelligence Services Act defines GCHQ's role in the post Cold War world. National security, economic well-being and the prevention and detection of serious crime are its headline interests. It routinely gathers information on drug-dealing, terrorism, and the movement of arms and key resources such as oil, but is also said to be heavily involved in ECHELON. GCHG praises itself to use and design high end technology such as Cray systems, Tandem based storage and high-end workstations, as well as software for Signals Analysis, Complex Data Manipulation, Translation and Transcription.