A-4. Signal Processing; A-4-1. Compression System Of Video Signal; A-4-2. Outline Of Signal Processing - Sony DNW-A75 Maintenance Manual

A-4. Signal Processing

A-4. Signal Processing

A-4-1. Compression System of Video Signal

In the Betacam SX format, MPEG2 4:2:2 Profile @Main
Level (omitted as MPEG2 4:2:2P@ML hereafter) is
employed as the compression system of a video signal.
In the MPEG2 4:2:2P@ML coder of this unit, video data is
compressed for each GOP (1GOP is two frames) by frame
correlation. As a result, video data can be compressed
efficiently. In the DNW-A75/A75P, the video data is
compressed to approximately 1/10.

A-4-2. Outline of Signal Processing

Reproduction of the Betacam/Betacam SP Tape
The video and audio signals reproduced from the tape
based on a Betacam or Betacam SP format are converted
into a digital signal. After that, the output data is also sent
to the video and audio output terminals after gain adjust-
ment in the Video Processer and Audio Process.
It is possible to output the video data that is compressed
using an MPEG2 4:2:2P@ML coder, and integrated with
the audio data using an SDTI output interface (option).
(Refer to Fig. A-4-1.)
PB
Head
RF
EQ
Tape
(Betacam/
Betacam SP)
LAU
Heads
A-6
Video
Analog Betacam
Process
Video PB
Process
AFM
Process
Audio
Process
LAU PB
Process
MPEG 2
4:2:2P@ML
Coder
(Bit Reduction)
Fig. A-4-1
Analog Video Outputs
D/A
(Composite)
Analog Video Output
D/A
(Component)
D/A Analog Audio Outputs
Digital Audio Outputs
(AES/EBU)
V
SDI
SDI Outputs
A
Interface
A
SDTI(SX)
SDTI(SX) Outputs
V
Interface
Option BKNW-118
A
SDTI-CP
V
SDTI-CP Outputs
Interface
Option BKNW-124
DNW-A75/A75P