Cutoff Frequency Filters: The frequency at which a signal falls off by 3 db (the half power point) from it's maximum value. Also referred to as the -3 db points, or the corner frequencies

 

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Cutoff Frequency Filters: The frequency at which a signal falls off by 3 db (the half power point) from it's maximum value. Also referred to as the -3 db points, or the corner frequencies

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

Machine-Learning Filters: Filters run by machines that determine whether to block email based on algorithms that point to whether the message is likely spam.

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

Radio Frequency Interference (RFI): A high-frequency signal radiated by improperly shielded conductors. RFI can interfere with the operation of other electronic devices.

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.

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 )

Gelatin Filters: Filters cut from dyed gelatin sheets and held in front of the lens or studio light.

Frequency Reuse: The ability to use the same frequencies repeatedly across a cellular system, made possible by the basic design approach for cellular. Since each cell is designed to use radio frequencies onl . . . View Full Definition