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 RadioShack Consumer Electronics Glossary: J

Jack
Electronics: A socket or connector into which a plug may be inserted. Click here for illustrations of various audio video jacks and plugs.
 
Jaggies
Digital Video: A term used to describe the stair-stepped appearance of a curved or angled line in digital imaging. The smaller the pixels, and the greater their number the less apparent the "jaggies". Also known as Pixelization.
 
Japanese Future Public Land Mobile Telecommunications Services: see J-FPLMTS.
 
Japanese Digital Cellular: see JDC.
 
Japan Total Access Communication System: see J-TACS.
 
JDC
Acronym: Japanese Digital Cellular
Telephony: The Japanese cellular system (renamed to PDC). It uses the upper 900 MHz and 1.5 GHz bands.
 
J-FET
Acronym: Junction Field-Effect Transistor
Electronics: A voltage-controlled transistor in which the source-to-drain conduction is controlled by the gate-to-source voltage and that has a channel consisting of either an N-type (N-channel) or P-type (P-channel) semiconductor material with the gate consisting of the opposite semiconductor type. See FET and MOSFET.
 
J-FET, N-type
Electronics: A J-FET that has a channel consisting of an N-type semiconductor material, with electrons as the primary charge carrier.
 
J-FET, P-type
Electronics: A J-FET that has a channel consisting of a P-type semiconductor material, with electron deficiencies as the primary charge carrier.
 
JFIF
Acronym: JPEG File Interchange Format
Digital Video: A specific type of the JPG file format. Also known as EXIF.
 
J-FPLMTS
Acronym: Japanese Future Public Land Mobile Telecommunications Services
Telephony: The Japanese equivalent of the IMT-2000 third-generation technology standard.
 
Jitter
Audio: A distortion that occurs during digital audio extraction (ripping) or conversion to analog. Jitter correction helps restore the audio to its original condition.
Video: A distortion caused by intermittent variations in the characteristics (such as frequency, amplitude, etc.) of a signal.
 
Joint Photographic Experts Group: see JPEG.
 
Joule
Electronics: A measure of the amount of energy delivered by one watt of power in one second or 1 million watts of power in one microsecond. The Joule rating of a surge protection device is the amount of energy that it can absorb before it becomes damaged. Named for James Prescott Joule.
1 Joule = 0.5 x (Capacitance in Farads) x (Voltage^2)
 
JPEG, JPG:
Acronym: Joint Photographic Experts Group
Digital Video: A lossy compression format, this is the most common type of image file format used in digital cameras.
 
J-TACS
Acronym: Japan Total Access Communication System
Telephony: The narrowband analog cellular FM system used in Japan. The channels are 12.5 KHz wide and use subaudio signaling.
 
Jughead
Internet: A search engine for Gopher sites. Similar to Veronica, but with fewer options and a smaller index of sites.
 
Jukebox
Audio: A type of software that catalogues and plays recorded MP3 and other digital files according to the user's settings.
 
Junction
DIY, Electronics: The region separating two layers in a semiconductor material.
 
Junction, p-n
Electronics: The region separating the p layer and the n layer in a semiconductor.
 
Junction Field-Effect Transistor: see J-FET.

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