This article explains how to set volume in iOS 7 and iOS 8 for music, ringer (iPhone only), alarm, and Siri on iPhone, iPad (Mini), and iPod Touch. There are three different volume settings on iOS devices which can make setting the correct volume a little tricky.
Standard-definition television can only display 480 lines. The Panasonic television followed NHK's standards -- an analog signal that packed more information than traditional television signals. By the 1980s, NHK had developed the technology to the point that it was time to shop around for other customers.
NTSC is the official analog video standard in the U.S., Canada, Mexico, some parts of Central and South America, Japan, Taiwan and Korea. PAL is the dominant format in the World for analog television broadcasting and analog video display. PAL based on a 625 line or pixel row, 50 field/25 frames a second, 50Hz system. The signal is interlaced, like NTSC into two fields, composed of 312 lines or pixel rows each.