BONUS MATERIAL 265
DVR Digital video recorder Records video pictures digitally.
Dynamic range In television, the useful camera operating light
range from highlight to shadow, in which detail can be observed
in a static scene when both highlights and shadows are present.
In electronics, the voltage or power difference between the
maximum allowable signal level and the minimum acceptable
Echo A signal that has been reﬂ ected at one or more points
during transmission with sufﬁ cient magnitude and time differ-
ence as to be detected as a signal distinct from that of the primary
signal. Echoes can be either leading or lagging the primary signal
and appear on displays as reﬂ ections or “ghosts”.
EDTV Extended deﬁ nition television A marketing term for a
standard deﬁ nition television set that displays a progressive scan
(non-interlaced) picture and usually has a horizontal resolution
near the high end of SDTV (over 600 pixels).
EIA Electronics Industry Association EIA is a trade alliance for
its members engaged in or associated with the manufacture, sale
or distribution of many categories of electronic equipment.
EIA interface A standardized set of signal characteristics (time
duration, waveform, delay, voltage, current) speciﬁ ed by the Elec-
tronic Industries Association.
EIA sync signal The signal used for the synchronizing of scan-
ning speciﬁ ed in the Electrical Industry Association standards RS-
170 (for monochrome), RS-170A (for color), RS-312, RS-330, RS-420,
or subsequent speciﬁ cations.
Electromagnetic focusing A method of focusing a cathode ray
beam to a ﬁ ne spot by application of electromagnetic ﬁ elds to one
or more deﬂ ection coils of an electron lens system.
Electronic viewﬁ nder see Viewﬁ nder, electronic.