Juht- f- Ant.fiidri gener. kordisti Võimendi seadmed Modu- laator Juhtgeneraator annab signaali, madalama sagedusega, kuna seda on kergem hoida. F-kordisti muudab kõrgsageduslikuks signaaliks. Võimendi võimendab signaali. Modulaator moduleerib signaali. Ant.fiidri seadmed edastavad antennile signaali. Antenn kiirgab signaali välja. 50
öelda moduleerimise teel – madalsageduslik sisu salvestati väga kõrgsageduslikele lainetele. Esiteks saab selliseid laineid saata ja vastu võtta täitsa mõistliku anten- kõik võngub niga. Teiseks tuleb välja, et nii võime paralleelselt saata ka väga palju erinevaid sig- naale. Kõige lihtsam neist moduleerimise tehnoloogiatest, AM ehk amplituudi modu- latsioon on lähedalt seotud tähelepanekuga, et trigonomeetriliste funktsioonide korrutise võib lahti kirjutada nende summana ning vastupidi. Amplituudi modulat- sioon ei tähenda seejuures midagi muud kui seda, et ühe laine amplituudi muude- takse teise laine abil. Seeläbi salvestatakse algsesse lainesse informatsiooni.
In this example, a source of ambient light causes the phototransistor to have a con- stant DC offset, and the signal is superimposed on a 60 Hz signal from fluorescent lighting. By passing the output of the transistor through a filter that is tuned to the original modulation frequency, these components can be removed and the signal converted to digital. The filter can be implemented in hardware or soft- ware. The IR method used in television remote control uses a 40 kHz modu- lation technique (a high-speed photodiode is used in the receiver to get this kind of speed). Filtering such as this has some drawbacks. The first is speed. Due to the turn-on and turn-off times of the phototransistor, there is a maximum mod- ulation frequency that will work—typically around 10 kHz. Since filtering the signal takes some time, it takes several cycles for a mechanical change in what- Figure 3.9 Optical sensor filtering.
Sociological Review, 48, 560-568. Phillips, D. P., 8{ Cartensen, L. L. (1986). Clustering of teenage suicides after television news stories about suicide. The New EnglandJournal of Medicine, 315, 685-689. Phillips, D. P., 8{ Cartensen, L. L. (1988). The effect of suicide stories on various demo- graphic groups, 1968-1985. Suicide and Life-Threatening Behavior, 18, 100-ll4. Plassmann, H., O'Doherty, J., Shiv, B., 8{ Rangel, A (2008). Marketing actions can modu- late neural representations of experienced pleasantness. Proceedings of the National Academy of Sciences, 105, 1050-1054. Platow, M. J., Haslam, S. A, Both, B., Chew, 1., Cuddon, M., Goharpey, N., Maurer, J., Rosini, S., Tsekouras, A, 8{ Grace, D. M. (2005). "It's not funny if they're laughing": Self- categorization, social influence, and responses to canned laughter. Journal of Experi- mental Social Psychology, 41, 542-550.
growth during fermentation. Ribose is released by ATP hydrolysis, and the subsequent metabolism of ribose- derived molecules is used for energy production by L. sakei. When sugar concentration declines, free amino acids (a.a) are utilized for microbial growth. Via the arginine deiminase (ADI) pathway, arginine is converted to ornithine and supports the growth of lactobacilli in the latter stage of meat fermentation. Staphylococci modu- late the aroma through the conversion of amino acids (particularly the branched-chain amino acids leucine, isoleucine, and valine) into methyl-branched aldehyde, methyl-branched acids and sulphites, diacetyl, and ethyl ester. The methyl ketones (2- pentanone and 2-heptanone) derive from intermediates of an incomplete ß- oxidation pathway in staphylococci.
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