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Introduction to Electronic Media
Outline: Lecture 2, Electronic Media Technology
Outline: Lecture 2, Electronic Media Technology
1 announcements
1.1 syllabus on website is now current
juanmonroy.com—electronicmedia
http://juanmonroy.com/electronicmedia/
1.2 quizzes are now due on Mondays not Fridays
2 facsimile
2.1 fidelity
faithfulness
2.2 transduction
energy
sound waves
light beams
electronic signal
analog of the original
digital bits and bytes
binary code
1
0
3 oscillation
3.1 vibrations
3.2 waveform
3.3 wavelength
speed
frequency
Hertz
3.4 wave height
intensity
amplitude
dB
3.5 frequency response
effect on fidelity
4 Electronic Media The Dominick textbook discusses five steps in electronic media. In class, I covered only three, but you should know all five. The following are the five steps in very basic form.
5 signal generation
5.1 microphones
dynamic
diaphragm
electromagnet
voice coil
velocity
condenser
5.2 digital audio
process
sound transduced into electrical current
converted to samples
quantization: coded and stored as binary data
5.3 video
scanning
interlacing
retracing
fields
frames
analog standards
NTSC
525-lines
60 Hz
30 frames per sec
PAL
625-lines
50 Hz
25 frames per sec
digital television
Advanced Television Systems Committee
high definition
1080-lines
1920 pixels per line
60 Hz
progressive scanning
aspect ratio
4:3
16:9
6 amplification and processing
6.1 audio
amplifier
vacuum tube
transistors
integrated circuits
mixing consoles
computer mixing programs
6.2 video
switcher
fader
[chroma] keying
video effects
desktop video
Final Cut Pro
Avid Media Composer
7 transmission
7.1 electromagnetic spectrum
carrier waves
modulation
radio frequencies
effective radiated power
height above average terrain
7.2 broadcast radio
amplitude modulation
540 – 1610 KHz
clear channel
regional channels
local channels
frequency modulation
88–108 Mhz
200 KHz bandwidth
channel separation
avoid interference
sidebands
stereo multiplexing
HD subchannels
7.3 broadcast television
television channels
NTSC
6 MHz bandwidth
VHF band
channels 2–13
UHF band
channels 14–83
7.4 satellite
C-band
Ku-band
direct broadcast satellite
1994
Ka-band
DirecTV
Dish
digital audio broadcasting
2002
XM Radio
Sirius
7.5 coaxial cable
copper wire
electrical signal
oldest wiring technology
low-ish resistance
loss of signal over great distances
7.6 fiber optic cable
glass tubes and mirrors
light carrying signal
fast
little loss of signal over long distance
7.7 cellular radio
Global System Mobile
Code Division Multiple Access
7.8 WiFi
802.11
2.4 or 5 GHz
8 reception
8.1 radio receivers
AM
FM
satellite radios
8.2 television receivers
analog television
digital television
HDTV
9 storage and retrieval
9.1 phonographic records
9.2 magnetic tape
9.3 magnetic hard disk
9.4 magnetic video tape
9.5 2-inch open reel
1956
9.6 ¾ inch VTR
9.7 home videocassettes
½ inch videotape
Betamax
Sony 1976
VHS
Matsushita 1977
9.8 digital videotape
MiniDV
DVCAM
9.9 DVD
fasted adopted media recording technology
90% penetration by 2002 (five years)
9.10 digital video recorder
personal video recorder
time-shifted viewing