reference white signal
61Delta-sigma modulation — Delta sigma (ΔΣ; or sigma delta, ΣΔ) modulation is a method for encoding high resolution or analog signals into lower resolution digital signals. The conversion is done using error feedback, where the difference between the two signals is… …
62Lock-in amplifier — A lock in amplifier (also known as a phase sensitive detector) is a type of amplifier that can extract a signal with a known carrier wave from extremely noisy environment (S/N ratio can be as low as 60 dB or even lessFact|date=December 2007). It… …
63AZUSA — refers to a ground based radar tracking system installed at Cape Canaveral, Florida and the NASA Kennedy Space Center. AZUSA dated back to the early 1950s and was named after the southern California town (Azusa, California) where the system was… …
64Global Positioning System — GPS redirects here. For other uses, see GPS (disambiguation). Geodesy Fundamentals …
65Time travel — This article details time travel itself. For other uses, see Time Traveler. Time travel is the concept of moving between different moments in time in a manner analogous to moving between different points in space, either sending objects (or in… …
66Color television — Title card for NBC, promoting their broadcast in RCA color . Color television is part of the history of television, the technology of television and practices associated with television s transmission of moving images in color video. In its most… …
67Past Tense (Venture Bros. episode) — Infobox Television episode Title=Past Tense Series=The Venture Bros. Season=1 Episode=11 Airdate=16 October 2004 Writer= Jackson Publick Director= Jackson Publick Caption = Now that s how it s done! Production = 1 12 Guests = Prev=Tag Sale – You… …
68Glossary of rail terminology — Rail transport Operations Track Maintenance High speed Gauge Stations …
69Sentence spacing — Double sentence spaced typewriter text (1946) vs. single sentence spaced typeset text (1979) Sentence spacing is the horizontal space between sentences in typeset text. It is a matter of typographical convention …
70Electrocardiography — ECG redirects here. For other uses, see ECG (disambiguation). Not to be confused with echocardiogram, electromyogram, electroencephalogram, or EEG. Electrocardiography Intervention Image showing a patient connected to the 10 electrodes necessary …
