By Graham A. Jones

Vital Updates! This 3rd version has been reorganized and up-to-date all through. It encompasses new criteria and identifies and explains rising electronic applied sciences at the moment revolutionizing the undefined. Additions contain: ."Broadcast fundamentals" - first ideas if you rather are ranging from scratch .ATSC PSIP (Program and method details Protocol) and information Broadcasting .More details on ATSC electronic tv criteria and implementation .Current television studio operations - HD and SD platforms, video servers, non-linear enhancing, digital information rooms, closed captioning, and compressed bitstreams .Station and community preparations, centralcasting, and multicasting .IBOC electronic HD radio and strategies for implementation .Current radio studio operations - electronic audio workstations, application automation, and voice monitoring .and even more! * examine from specialist Graham Jones of the nationwide organization of Broadcasters--the such a lot depended on identify in broadcast * Covers tv and radio, analog and electronic * filled with jargon-busters

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The format is able to carry two channels of audio (either two mono channels or one stereo pair), at any of the standard digital audio sampling frequencies, and with an accuracy of 16, 20, or 24 bits per sample. The stream of digital bits is organized into 64 bit segments called frames (not to be confused with video picture frames). Each of these frames is further broken down into two subframes. Subframe 1 carries the digital audio information for audio channel 1, and subframe 2 carries the digital audio information for audio channel 2.

Strictly speaking, the electrical video signal components carried through most of the television chain should be referred to as luma and chroma. These terms have a slightly different technical meaning compared to luminance and chrominance (it has to do with something called gamma correction, which is outside the scope of this book). However, the terms are frequently used interchangeably— although sometimes incorrectly—by most people. Therefore, for 5 ANALOG COLOR TELEVISION 41 simplicity, we will only use luminance and chrominance in this book, except where normal usage is to use the words luma or chroma.

The UHF and SHF bands have further subdivisions, with bands that are used for terrestrial radio links, satellite links, and for satellite broadcasting. These include the L, S, C, X, Ku, K, and Ka bands, with frequencies from about 1 GHz to 40 GHz. Properties Because of the varying wavelengths, waves in different bands have different propagation properties. In particular, the shorter the wavelength, the more the wave tends to travel in straight lines and to be blocked by obstacles in its path. Longer waves, such as in the AM medium frequency band, tend to “flow” around obstructions and propagate in different ways, with a ground wave and a sky wave.

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