Numeric precision in Microsoft Excel: Difference between revisions

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'''Frame''' is electronically coded still image in [[video]] technology
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==Line and resolution==
{{main|Video}}
The frame is composed of picture elements just like a chess boardEach horizontal set of picture elements is known as a [[line (video)|line]]. The picture elements in a line are transmitted as [[sine wave|sine]] signals where a pair of dots, one dark and one light can be represented by a single sine. The product of the number of lines and the number of maximum sine signals per line is known as the total resolution of the frame. Higher the resolution the more faithful the displayed image to the original image. But higher resolution introduces technical problems and extra cost. So a compromise should be reached in system designs both for satisfactory image quality and affordable price.
 
==Viewing distance==
 
For computing the lowest resolution which still seems satisfactory to viewers, the key parameter is the viewing distance, i.e., distance between the eyes and the monitor. The total resolution is inversely proportional to the square of the distance. If '''d''' is the distance, '''r''' is the required minimum resolution and '''k''' is the proportionality constant which depends on the size of the monitor;
 
:<math> r = k^2 \cdot  \frac{1}{d^2}</math>
 
Since the number of lines is approximately proportional to resolution per line, the above relation can also be written as
 
:<math> n = k \cdot  \frac{1}{d} </math>
where '''n''' is the number of lines. That means that the required resolution is proportional the height of the monitor and inversely proportional to the viewing distance.
 
==Moving picture==
 
In moving picture (TV) the number of frames scanned per second is known as frame rate. The higher the frame rate, the better the sense of motion. But again, increasing the frame rate introduces technical difficulties. So the frame rate is fixed at 25 ([[CCIR System B|System B/G]]) or 29.97 ([[CCIR System M|System M]]). But for increasing the sense of motion it is customary to scan the very same frame in two consecutive phases. In each phase only half of the lines are scanned; only the lines with odd number in the first phase and only the lines with even number in the second phase. Each scan is known as a field. So field rate is two times the frame rate.
 
==Example (system B)==
{{Main|CCIR System B}}
In system B the number of lines is 625 and the frame rate is 25. The maximum video bandwidth is 5 MHz. <ref> ''Reference Data for Radio Engineers'', ITT Howard W.Sams Co., New York, 1977, section 30 </ref> The maximum number of sine signals the system is theorically capable to transmit is given as follows:
 
The system is capable to transmit 5 000 000 sine signals in a second. Since the frame rate is 25,  the maximum number of sine signals per frame is 200 000. Dividing this number by the number of lines gives the maximum number of sine signals in a line which is 320. (Actually about 19% of each line is devoted to auxiliary services. So the number of maximum useful sine signals is about 260. )
 
==References==
{{reflist}}
 
{{Analogue TV transmitter topics}}
[[Category:Television technology]]

Latest revision as of 18:53, 23 December 2014



Most people today would agree that the very best cooks and chefs are the ones know how to use their kitchen knife. Nonetheless, cutting a potatoe typically calls for a heavier knife than an onion does. Your fork must be strong and at least 16 inches long and be accompanied by a great chef or butcher kind knife. Aluminium cookware, stainless cookware, fry pans, iron wok , rice cookers, flatware set and even far more. Aluminium cookware, stainless cookware, fry pans, Kitcheniq Knife Sharpener Reviews cast iron wok , rice cookers, flatware set etc.

No matter whether you are a experienced chef or you enjoy eating delicious meals, cutlery knives are nevertheless important so they need to be dependable and protected to use. The cutlery set consists of fork, spoon and knife which are meant for providing sophistication to your dinning manners. The list I have provided is only a sample of what you can get to set up your kitchen to really feel like a definitely fun location exactly where you can destress from the day and unwind and make some gorgeous meals.

If you are not familiar with a standard chef's grip, you merely hold the knife with your back fingers on the manage, but thumb and forefinger are on the blade like you are pinching it. This position gives you the most control but may really feel uncommon at first to the starting dwelling cook. Scott wasn't going to let his tendonitis and carpal tunnel hold him from becoming a main player in the culinary globe.

Costs differ, but as the time of publication, an 8-inch chef's knife retails about $60. There are 3 most important components to think about when choosing a chef's knife: the steel, the manage and the weighting. Most knife handles now are produced from a composite material as an alternative of wood and are ergonomically designed for comfort. Take into account the distinctive tasks you will be performing with your knife such as slicing, dicing and chopping. Appear for a chef's, or French, knife.

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