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- W77428625 abstract "This chapter discusses remote supervision of unattended transmitters. It describes representative transmitting station including the scope of possible monitoring, supervisory and control systems. The program input equipment for the vision signals. This connects an incoming program feed to a pair of transmitters. Every active item of equipment in the program path is duplicated, even though in many cases only a single line feed is available. In fact, the single line feed is probably backed up by reserve circuits and other duplicated amplifiers in the path. The need to monitor the output of transmitting stations and that this can sometimes be done directly off-air at a control station. Monitoring can be subdivided into two categories: subjective monitoring of picture content and production standards and the strictly technical performance of the transmission network. Luminance bar amplitude is determined by measuring the difference between the level at the mid-point of the bar and a reference point at blanking level. The result is expressed as a percentage of the nominal value of 700 mV. The position of the blanking level reference is determined by a clamp that operates for nominally 630 ns commencing approximately 8.4 ps after the half-amplitude point of the leading edge of each line synchronizing pulse. Sync amplitude is determined by measuring the difference between the mid-point of the last broad pulse of each field and black level. The result is expressed as a percentage of the nominal sync amplitude of 300 Mv." @default.
- W77428625 created "2016-06-24" @default.
- W77428625 creator A5066434517 @default.
- W77428625 date "1991-01-01" @default.
- W77428625 modified "2023-09-25" @default.
- W77428625 title "Remote Supervision of Unattended Transmitters" @default.
- W77428625 doi "https://doi.org/10.1016/b978-0-7506-1021-6.50023-2" @default.
- W77428625 hasPublicationYear "1991" @default.
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