Frequency Modulation (FM): In radio broadcasting, a method of modulation in which the frequency of the carrier voltage is varied with the frequency of the modulation voltage (Also see Amplitude Modulation).

 

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Frequency Modulation (FM): In radio broadcasting, a method of modulation in which the frequency of the carrier voltage is varied with the frequency of the modulation voltage (Also see Amplitude Modulation).

Pulse Width Modulation (PWM): Is a way of simulating an analog output by varying high and low signals at intervals proportional to the value.

Quadrature Amplitude Modulation (QAM): A method of modulating digital signals using both amplitude and phase coding. Used for downstream and can be used for upstream.

Radio Frequency (Rf): An alternating current or voltage with a frequency (or carrier wave) above about 100khz. It's called radio frequency because these frequencies have a capacity to be radiated as electromagnet . . . View Full Definition

Radio Frequency Identification (RFID): RFID first appeared in tracking and access applications during the 1980s. It is a method of remotely storing and retrieving data using devices called RFID tags/transponders and is coming int . . . View Full Definition

Pulse Repetition Frequency (PRF): The number of radar pulses transmitted each second. The pulse transmission rate is automatically lengthened for longer ranges.

MTF (Modulation Transfer Function): A comparison of contrast between a test chart and the reproduced image. One of the measurements of lens performance used in the manufacturing process.

Inverse Document Frequency (IDF): Inverse Document Frequency is a term used to help determine the position of a term in a vector space model. IDF = log ( total documents in database / documents containing the term )

Low Frequency: Refers to radio frequencies within the 30-300 khz band. In audio it usually refers to frequencies in the 20-160 Hz band.

Modulation: The process of changing from one key to another.