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standard is used in Canada, Mexico, the US, and Japan NTSC is shorthand for National Television Systems Committee The PAL standard and its variations PAL-M and PAL-N are used in most of Europe, as well as China, India, South America, Africa, and Australia PAL is shorthand for Phase Alternating Line A third standard, known as SECAM, is in use in Russia and France SECAM is the acronym for Syst me lectronique pour Couleur avec M moire The English translation of SECAM is Sequential Color with Memory Production for SECAM is accomplished using PAL format equipment These television standards are adapted from the electrical standards of the respective countries Long before the invention of television, the US standard for electricity was developed so that manufacturers would be able to make products that would work when plugged in to a common electrical source The US standard was set at 110/120 volts, with the system changing polarity from positive to negative and back again, 60 times a second This sequence is referred to as alternating current, with each positive/negative polarity change termed a cycle In Europe, the standard was set at 220/240 volts and 50 cycles per second When first introduced, television broadcasts were in black and white, and the NTSC standard mandated a rate of 30 frames per second with two fields comprising a frame, for 60 fields per second NTSC uses 525 scan lines to compose a frame, with the odd lines displayed as field one and the even lines displayed as field two The fields interlace on presentation to compose a frame The PAL standard adopted a rate of 25 frames per second, also comprised of two fields, for 50 fields per second, and uses 625 scan lines to compose a frame The scan line counts are the product of a string of small integer factors that, at the time, could only be reliably supported by vacuum tube divider circuits 525 is 7 5 5 3, and 625 is 5 5 5 5 These divider circuits derive the field rate from the power line rate These factors combined to give monochrome NTSC 525/60 television a line rate of 30 (7 5 5 3), or exactly 15750 kHz Monochrome PAL 625/50 television has a line rate of 25 (5 5 5 5), or exactly 15625 kHz With the introduction of color for television, the NTSC number takes on immense significance, whereas the PAL signal structure was mostly unaffected In 1953, when adding color to the monochrome signal, a second NTSC determined that it would be appropriate to choose a color subcarrier in the region of 36 MHz This subcarrier would imbed the color information within the television signal But there was a technical concern with adding the color information without disturbing the sound subcarrier element of the signal Too close a relationship in the subcarrier frequencies would result in distortion that would become visible in the luminance component of the signal Remember that the responsibility for setting broadcast standards resides with the Federal Communications Commission (FCC) If the FCC had altered the sound subcarrier frequency to be increased by the fraction 1001/1000 (as recommended by the second NTSC) that is, increased by 45 kHz to about 45045 MHz then the color subcarrier in NTSC could have been exactly 3583125 MHz, the line and the field rates would have been unchanged, and we would have retained exactly 30 frames per second! But true to form, alas, the FCC refused to alter the sound subcarrier for fear of possible minor audio interference on existing black and white television receivers Instead, the FCC.



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needs for reverse communications This node development is graphically described in Figure 8-9 8224 The nodes where the cable system converts from optical cable to coaxial cable may be aerial plant or underground plant Manufacturers of such equipment make the equipment available in both strand-mounted enclosures or pedestal- or vault-mounted enclosures This equipment basically consists of an optical PIN diode detector connected to a broadband RF ampli er From this ampli er the whole forward frequency spectrum can be distributed to subscribers by the coaxial cable distribution system This concept is shown in Figure 8-10 Power for the optical- ber system to the RF converter is obtained from the normal coaxial cable plant at 60 or 90 vac Remember that optical cable does not carry low-frequency ac or dc for that matter However, some optical cable contains a metallic conductor that could be used for powering For the reverse system, the subscriber s upstream information is multiplexed with other subscribers data onto a sub-split reverse carrier At

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chose to reduce both the line rate and the field rate by the fraction 1001/1000, effectively dropping those rates to about 15734 kHz and 5994 Hz, respectively Thus the 5994 rate was born!5 Unfortunately the field rate of 60 divided by 1001, rounded to 5994 for convenience, means that 60 fields consumes slightly more than one second, so 30 frames no longer agrees with one second of clock time As a side note, this precipitated the invention of dropframe timecode that, ostensibly, alleviated this disparity Regrettably, the shortsighted, although pragmatic, FCC decision helped to bring about the frame and video rate complexity that exists today This is further amplified by the continuing convergence of video and computer technologies and terminologies, let alone the emergence of high definition standards and formats As noted in the Introduction, a billion might mean something other than a thousand million

The next step up in handling data from variables is arrays, and arrays work in PHP much as they do in JavaScript Here s an example, arraysphp, that gives you the fundamentals of working with arrays In PHP, you can create an array simply by referring to it Here s how we create an array named $fruit (like other variables, array names in PHP begin with a $) and assign $fruit[0] the string "apples" (as in JavaScript, arrays in PHP are 0-based):

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We can add other items to the array as well:

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