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.
It is an improvement on the earliest television technology, monochrome or black and white television, in which the image is displayed in shades of grey (greyscale). Television broadcasting stations and networks in most parts of the world upgraded from black and white to color transmission in the 1960s and 1970s. The invention of color television standards is an important part of the history of television, and it is described in the technology of television article.