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| | Myrtle Benny is how I'm called and I feel comfortable when people use the full title. What I love doing is doing ceramics but I haven't produced a dime with it. Puerto Rico is where he's been residing for many years and he will by no means move. I am a meter reader but I strategy on altering it.<br><br>my web page [http://www.karachicattleexpo.com/blog/56 www.karachicattleexpo.com] |
| A '''figure of merit''' is a quantity used to characterize the performance of a device, system or method, relative to its alternatives. In engineering, figures of merit are often defined for particular materials or devices in order to determine their relative utility for an application. In commerce, such figures are often used as a marketing tool to convince consumers to choose a particular brand.
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| ==Examples==
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| *[[Clock rate]] of a [[CPU]]
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| *[[Calorie]]s per serving
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| *[[Contrast ratio]] of an [[LCD]]
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| *[[Frequency response]] of a [[Loudspeaker|speaker]]
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| *[[Fill factor]] of a [[solar cell]]
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| *[[Image resolution|Resolution]] of the [[image sensor]] in a [[digital camera]]
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| *Measure of the detection performance of a [[sonar]] system defined as the [[propagation loss]] for which a 50% detection probability is achieved
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| *[[Noise figure]] of a radio receiver
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| *The [[thermoelectric figure of merit]], Z, a material constant proportional to the efficiency of a thermoelectric couple made with the material
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| *The figure of merit of [[digital-to-analog converter]] (DAC) is calculated as (Power dissipation)/((2^ENOB) * Effective Bandwidth) [J/Hz].
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| *[[Luminous efficacy]] of [[lighting]]
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| *Battery life of a [[laptop computer]] <ref>[http://www.nytimes.com/2009/06/25/technology/personaltech/25pogue.html Decoding Battery Life For Laptops] New York Times, June 25, 2009</ref>
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| [[Benchmark (computing)|Benchmark]]s are synthetic figures of merit that summarize the speed of computers in performing various typical tasks. Benchmarks designed by a manufacturer generally rate the manufacturer's products more favorably than benchmarks designed by others or by independent benchmarkers.
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| == Modulation Systems==
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| {{unreferenced section|date=December 2013}}
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| In modulation systems for communication, figure of merit of a device means the ratio of output [[Signal to Noise Ratio]] to the input Signal to Noise Ratio.
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| === Amplitude modulation ===
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| {{unreferenced section|date=December 2013}}
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| Figure of merit for Amplitude modulation is given by
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| :<math>\mathrm{\frac{(SNR)_{O,AM}}{(SNR)_{C,AM}}}=\frac{k_a^2P}{1+k_a^2P}
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| </math>
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| Figure of merit for DSB-SC receiver or that of an SSB modulation is always unity. Therefore noise performance of AM receiver is inferior to that of a DSB-SC receiver or an SSB receiver.
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| === Frequency modulation ===
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| {{unreferenced section|date=December 2013}}
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| Figure of merit for Frequency modulation is given by
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| :<math>\mathrm{\frac{(SNR)_{O,FM}}{(SNR)_{C,FM}}}=\frac{3k_f^2P}{W^2}
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| </math>
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| ==Deception==
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| {{unreferenced section|date=December 2013}}
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| The precision and verifiability of numbers sometimes make them a more effective sales tool than vague and non numeric descriptions such as "state of the art" or "leaves the others in the dust". When used in [[deceptive advertising]], the deception lies more in the question of relevance rather than truth since the number quoted as a figure of merit may not be enough to determine performance when comparing products. For example, when purchasing a laptop a consumer could choose based on the capacity of its hard drive. The [[Revolutions per minute|RPM]], [[Disk buffer|buffer]], and [[seek time]]s may not be noted, but significantly affect performance.
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| Some figures such as [[PMPO|Peak Music Power]] are used in selling consumer merchandise and have the principal merit of yielding high numbers that can impress people who don't know what the numbers mean. Other figures such as [[Specific fuel consumption (thrust)|Specific Fuel Consumption]] are addressed to engineers and other studious buyers whom the sellers dare not mislead.
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| Another example is the [[megapixel]] count of a [[digital camera]]. A consumer unaware that the number of pixels on a sensor is only one factor in the quality of the image that is captured may, for example, buy a camera with more pixels squeezed onto a small [[image sensor]], thus losing quality to small pixels.
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| Makers of cheap, consumer-market [[optical telescope|telescopes]] often tout the magnification power of their products, sidestepping the fact that [[aperture]], optical quality, and the type and quality of the telescope's mount are of more importance in obtaining a quality image.
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| ==See also==
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| *[[Performance metric]]
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| ==References==
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| {{Reflist}}
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| [[Category:Types of marketing]]
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| [[Category:Engineering ratios]]
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Myrtle Benny is how I'm called and I feel comfortable when people use the full title. What I love doing is doing ceramics but I haven't produced a dime with it. Puerto Rico is where he's been residing for many years and he will by no means move. I am a meter reader but I strategy on altering it.
my web page www.karachicattleexpo.com