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Table 1.6: Dolby Digital Audio Encoding Bit-rates
Bit-rate
(kbit/s)
56
64
80
96
112
128
160
192
224
256
320
384
448
512
576
640
1.3.3
Vertical Blanking Interval (VBI) Line Processing
Modes
Introduction
The Encoder has three modes for processing VBI lines.
VBI in Picture
By selecting the VBI in Picture extended active picture format available in
the MPEG 4:2:2 specification the Encoder compresses and transmits the
VBI data as part of the active picture. This mode requires up to 3 Mbit/s of
extra bit-rate, depending on the amount and complexity of the VBI
present.
NOTE...
VBI in Picture transmits the VBI waveform as part of the picture and as such will be subject to some
distortion. Most analogue VBI types are robust against this type of distortion but others, e.g. video
index, are intended for SDI transmission and will not survive MPEG coding/decoding in VBI in Picture
mode. VITS test signal and ghost cancellation signal will become corrupted.
VBI User Data
Closed Caption data, together with other formats such as VITC and AFD,
can be transmitted in the user data field of the video or relevant part of
the video stream.
Instruction Manual: evolution 5000 E5710 and E5720 Encoder
ST.TM.E10074.1
Single Channel
Dual Channel
Mono (1/0)
Stereo (2/0)
3
-
3
-
3
-
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
Introduction to the Basic Encoder
Page 1-13
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