CHAPTER 3: FIELD APPLICATIONS
3-2
DigiVu
®
Series Multichannel MPEG-2/H.264 Encoder/Multiplexer with QAM &/or IP Output - Installation & Operation Manual
3.3 Analog Channel Insertion vs Digital Channel Insertion
Old Way – Analog System
One Channel contains one Program
One channel is deleted
A new program is modulated and reinserted
All channels can be tuned by an Analog TV Tuner
1 PROGRAM
1 PROGRAM
1 PROGRAM
ANALOG CHANNEL
ANALOG CHANNEL
ANALOG CHANNEL
ANALOG
TV
All original channels before
the Channel Deletion Filter
All original channels minus
one channel after the Channel
Deletion Filter
All original channels plus new
channels after the directional
coupler
1
PROGRAM
ANALOG
CHANNEL
1
PROGRAM
ANALOG
CHANNEL
1
PROGRAM
ANALOG
CHANNEL
1
PROGRAM
ANALOG
CHANNEL
1
PROGRAM
ANALOG
CHANNEL
DELETED
CHANNEL
1
PROGRAM
ANALOG
CHANNEL
1
PROGRAM
ANALOG
CHANNEL
ANALOG
CHANNEL
NEW
PROGRAM
CABLE TV IN
CHANNEL DELETION FILTER
CABLE TV OUT
DIRECTIONAL
COUPLER
NEW
PROGRAM
ANALOG
CHANNEL
MODULATOR
AUDIO
VIDEO
NEW
CHANNEL
SOURCE
MATERIAL
New Way – All Digital System
One Channel can typically contain up to 10 programs
One channel is deleted
Any number of programs within that channel can be “dropped”
One to Four new programs can be “added”, modulated and inserted
The new channel can only be tuned with a Digital Set-Top Box
DIGITAL CHANNEL
DIGITAL CHANNEL
DIGITAL CHANNEL
PROGRAMS
DIGITAL
TV
SET-TOP
BOX
All original channels before
the Channel Deletion Filter
All original channels minus
one channel after the Channel
Deletion Filter
All original channels plus new
channel and added programs
after the directional coupler
DIGITAL
CHANNEL
DIGITAL
CHANNEL
DIGITAL
CHANNEL
DIGITAL CHANNEL
PROGRAMS
DIGITAL CHANNEL
DIGITAL CHANNEL
DELETED CHANNEL
DIGITAL CHANNEL
NEW AND OLD
PROGRAMS
CABLE TV IN
CABLE TV OUT
CHANNEL DELETION FILTER
MODULATOR
DIRECTIONAL
COUPLER
NEW AND OLD PROGRAMS
NEW AND OLD
PROGRAMS
MULTIPLEXER
DROPPED
PROGRAMS
ORIGINAL
PROGRAMS
DEMODULATOR
NEW
PROGRAM 1
NEW
PROGRAM 2
ENCODER
NEW
PROGRAMS
DVISm
DIGITAL
CHANNEL
Figure 3-1:
Analog Channel Insertion vs Digital Channel Insertion