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Glossary of Technical Terms • AC-Current which periodically reverses Audio Frequency-See AF. Current-The flow of electric charges. direction at a certain frequency; also called Alternating Current. Audio Rectification Interference- dB-A logarithmic method of expressing the Interference to stereo equipment, telephones, ratio of one signal power level to another. AF-A frequency that corresponds to the and similar devices which occurs when an Short for decibel. range of human hearing. Short for Audio electronic component in the device converts a DC Frequency. radio-frequency current induced by a passing Current which flows in one direction radio weave into an audio-frequen y signal, only;also called Direct Current. Alternating Current-See AC. which is then amplified along wiz the desired Decibel-See dB. Ampere-The fundamental unit of electrical program material. Detection-The process of extracting the Base Station-A radio transmission facility intelligence embedded in or impressed upon a ._ Amplification-The process of increasing in a fixed location designed to communicate radio signal. Sometimes, electronic compo- the strength(amplitude) of an input signal, with mobile and portable armmunications nents like transistors in stereo amplifiers can • ideally without altering the signals frequency devices. inadvertently perform detection,resulting in or other characteristics. BlanketingOverloadinterferenceaudio rectification interference. - to a Amplifier-An electronic circuit chat per- radio or television receiver civisFa by a strong Detector-The portion of a radio receiver or farms the function of amplification. signal. The FCC has rules and policies an component that performs the function of requiring licensees to remedy the effects of detection. Analog-An electrical signal whose strength blanketing in certain situations. or frequency can vary continuously over a Digital-An electrical signal whose strength defined range; or a circuit which generarPs or Calcium Efflux-The migration of calcium or frequency can vary in discrete steps;or a 4111rocesses analog signals. ions from the brain in the presence of certain circuit which generarPs or processes digital RF fields. No one has tied any demonstrable sigma ANSI-The American National Standards medical health consequences to this effect. Institute, the nation's preeminent private Direct Current-See DC. standard-coordinating body.ANSI is a non- CDMA-A means of digitally transmitting profit, privately funded membership organi- more than one signal in a given frequency Directional Antenna-An antenna which zation that coordinates the development of 1'Y breaking up each signal into a series transmits or receives more effectively in U.S. voluntary national standards and is the of sequential samples,assigning each signal a certain directions than others. U.S.representative to nontreaty international Particular" '"which sprains the original Electric Field-A way to describe the standards-setting entities including the frequencies over a much greater frequency source of an electric force.The field arises International Organization for Standardization band,and then simultaneously transmitting the diand can affect charged electric particles. (ISO) and the Internationalerent signals Electrotechnical different within the one large Measured in volts per meter,millivolts per Commission. frequency band;a form of Spread Spectrum or microvolts per meter. Transmission. Short for Code Division Antenna-A device which converts radio- Multiple Ie Access. Electric Force-A force which can attract frequency currents from a transmitter into or repel charged electric particles,depending radio waves which then travel through space, Cell,dnr Base Station-A base station in on the polarityof the electric field from which or one which converts part of a passing radio the cellular telephone radio service. the farce arises and the polarity of the electri- wave into a radio-frequency current for Channel-A bond of radio frequencies used tally charged panicles affected. further processing by a receiver. to transmit certain information. Electromagnet-A coil of wire which gen- Apnea Monitor-A biomedical electronic Code Di" `midtipie Access'See CDMA. atones a magnetic field when electric Current which generates a warning signal upon Current flows through it. sensing irregularities in the breathing of the Crosstalk-The leakage of one or both sides person being monitored(typically an infant). of a telephone conversation into another Electromagnetic Fields-The electric and likExposure-Exposure to radio- conversation,caused,for example,by the magnetic fields that underlie a radio wave. frequency power at levels below those which errnal lack of synchronization of Trine Division The fields are at right angles to each other Multiple Access equipment or inadequate and to the direction of travel of the radio rrucse measurable warming of biological tissue• shielding between two sets of wireswave. rnr (Alternatively,Nontheal Exposure.) carrying the two different conversations.