Sony SRW-1 Operation Manual page 8

HDCAM-SR format
The HDCAM-SR format exploits advances in signal
processing and magnetic recording technology to enable
HD digital recording and playback with high image and
sound quality, with functionality comparable to that of the
HDCAM format.
• Highly efficient mild data compression based on the new
MPEG-4 Studio Profile
• Powerful error correction system
• Highly reliable narrow track recording and playback
through high-performance, high-accuracy, drum-
mounted heads.
These technologies allow extended high-definition
recording times on HDCAM-SR cassettes of the same size
as the HDCAM cassette: 40 minutes or more on S-size
HDCAM-SR cassettes.
Digital signal processing
4:2:2 component video signals or 4:4:4 RGB signals
obtained by quantization according to ITU-R709, SMPTE
274M, and BTA S-002B (SMPTE 260M/372M) are
compressed according to the MPEG-4 Studio Profile.
Audio signals are processed uncompressed, according to
the AES/EBU format.
Bit rate reduction encoder
Component video signal data is compressed to specified
data rates by a process in which it is subjected to frame
shuffling, DCT (discrete cosine transform) or DPCM
(differential pulse code modulation), quantizing
adjustment, and variable length word encoding. This
process forms the core of the new MPEG-4 Studio Profile
compression strategy. The process uses intra-frame
compression for progressive image capture and intra-field
compression for interlaced images.
ECC encoder
An outer ECC (error correction code) is interleaved with
the compressed data, followed by inner ECC, ID data, and
sync data. The error correction system uses standard Reed-
Solomon codes.
Channel coding
Video and audio with the addition of ECC data are
recorded in the form of serial data. The HDCAM-SR
format uses a scrambled NRZI (Non-Return-to-Zero
Inverted) channel coding system to ensure superior off-
track and noise tolerance characteristics.
Playback signal processing
Digital playback signals are equalized by equalizer circuits
and error corrected by powerful inner and outer ECC. This
process corrects most noise and dropout problems in the
reproduced signal. Data that cannot be completely
corrected in this way is corrected by error concealment
circuits.
8
1-1 Features
1)
Tele-File memory label system
The SRW-1 supports the Tele-File memory label system.
1) Tele-File:
A system in which non-contact memory ICs on the spines of cassettes
allow you to record and read data about the material on the cassettes. Tele-
File is a trademark of Sony Corporation.