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.
The world's first 625-line television standard was designed in the Soviet Union in 1944, and became a national standard in 1946. The first broadcast in 625-line standard occurred in 1948 in Moscow. The concept of 625 lines per frame was subsequently implemented in the European CCIR standard.