油毡
发表于 2025-3-25 04:48:53
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异教徒
发表于 2025-3-25 08:24:36
,Thesenförmige Zusammenfassung,two cases, the carrier is assumed to be a relatively high frequency sinusoid, the amplitude or frequency of which is modulated in sympathy with the instantaneous value of the signal . (.): and in the other two examples, . (.) is made to modulate either the width or the height of successive pulses in a pulse-train.
不能平静
发表于 2025-3-25 11:58:17
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饮料
发表于 2025-3-25 15:51:31
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男学院
发表于 2025-3-25 20:21:44
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Derogate
发表于 2025-3-26 02:31:24
Gewalt und Tod in den Black Hills (Dakota),en used to convey information throughout recorded history, and both Greeks and Romans employed light beacons in the pre-Christian era. A chain of beacons was used by the English in 1588 to warn of the approaching Spanish Armada, and about this time the word ‘signal’ came into general use to denote ‘
palette
发表于 2025-3-26 07:12:55
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muster
发表于 2025-3-26 11:30:41
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crease
发表于 2025-3-26 12:38:19
https://doi.org/10.1007/978-3-658-14239-1ntly. In recent years such signals have come to assume great importance because of developments in digital electronics and computing. Since it is not possible to feed continuous data into a digital (as opposed to analogue) computer, any signal or data input must be represented as a set of numerical
hauteur
发表于 2025-3-26 19:52:29
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