Webopedia on Google+Webopedia on TwitterWebopedia on FacebookTech Bytes Blog
Main » TERM » 6 »


The term 625/50 refers to PAL/SECAM, the analog TV system used in Europe and other countries. It's system of 625 scanning lines (presented as 265 scan lines (a field), interlaced, displaying 580 total lines of visible picture (a frame), at 50 hertz. This 50 hertz scanning rate results in a full frame every 1/25 of second. The 45 scanning lines not displayed is known as the VBI (vertical blanking interval), which contains certain signals that control the TV's scanning system and other functions.

See also HDTV.
Also see Webopedia's "Did You Know...All About Digital TV . DTV and HDTV".

8 Agenda Apps to Help Students Stay Organized

Webopedia's student apps roundup will help you to better organize your class schedule and stay on top of assignments and homework. Read More »

List of Free Shorten URL Services

A URL shortener is a way to make a long Web address shorter. Try this list of free services. Read More »

Top 10 Tech Terms of 2015

The most popular Webopedia definitions of 2015. Read More »

Java Basics, Part 1

Java is a high-level programming language. This guide describes the basics of Java, providing an overview of syntax, variables, data types and... Read More »

Java Basics, Part 2

This second Study Guide describes the basics of Java, providing an overview of operators, modifiers and control Structures. Read More »

The 7 Layers of the OSI Model

The Open System Interconnection (OSI) model defines a networking framework to implement protocols in seven layers. Use this handy guide to compare... Read More »