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.
To help consumers deal with the mounting tide of HDTV-related questions, the FCC created a consumer website http://www.dtv.gov in October 2004. The FCC has also set a timeline for the conversion from analog to digital television (DTV).