Features; Features Of The Srw-5000/Srw-5500 - Sony SRW-5000 Operation Manual

1-1 Features

1-1-1 Features of the SRW-5000/
SRW-5500
The SRW-5000/SRW-5500 is a high-definition digital
video cassette recorder using the HDCAM-SR format.
It is a small and light unit incorporating LSIs for signal
processing and is comparable to the HDCAM
HDW-F500 in size, weight and functionality.
The SRW-5500 only is a recorder supporting both the
HDCAM-SR and HDCAM formats.
HDCAM-SR Format
The HDCAM-SR format exploits technological
advances in signal processing and magnetic recording,
to provide functionality comparable to that of the
HDCAM format, while offering HD digital recording
and playback with high image and sound quality.
The technology incorporated in this unit includes the
following.
• Highly efficient and mild data compression using
newly developed MPEG-4 Studio Profile.
• Powerful error-correcting codes
• High-performance, high-accuracy heads and drum
with dynamic tracking (DT ™), together with a new
auto-tracking technique, yielding highly reliable
narrow track recording and playback.
These technologies allow 120 minutes of recording on
an HDCAM-SR cassette (L type), the same size as the
HDCAM cassette.
Digital Signal Processing
In this unit, 4:2:2 component video signals obtained by
quantization according to ITU-R709, SMPTE 274M
and BTA S-002B (SMPTE 260M) are compressed
using MPEG-4 Studio Profile. Audio signals are
processed uncompressed, according to the AES/EBU
format.
Input interface
The input interface is based on the HDSDI (HD Serial
Digital Interface) format BTA S-004B/005B/006B
(SMPTE 291M/292M/299M) and ARIB STD B-4,
allowing a single BNC coaxial cable to carry one
component video signal, twelve digital audio channels,
and time code in time division multiplex; this is
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1) HDCAM is a trademark of Sony Corporation.
separated for conversion to parallel data.
Audio recording can be switched between the digital
audio signal multiplexed with the HD SDI signal and
the audio signal from an AES/EBU digital interface.
Bit rate reduction encoder
The component video signal undergoes frame
1)
model
shuffling. It is then compressed by a process in which
it is subjected to DCT (discrete cosine transform) or
DPCM (differential pulse code modulation),
quantization control, and variable length word
encoding. This is the core of the newly developed
MPEG-4 Studio Profile. Interlaced signals are
compressed in fields and progressive signals are
compressed in frames.
ECC encoder
The outer ECC (Error Correction Code) is added to the
compressed video and audio data, followed by the
inner ECC, ID data, and sync data. Reed-Solomon
codes are employed in this error correction system.
Channel coding
Video and audio data with the ECC added is recorded
in the form of serial data. The HDCAM-SR format
adopts a scrambled i-NRZ channel coding system,
giving consideration to off-track and noise
characteristics.
Playback signal processing
The playback digital signal is equalized by an
equalizer circuit. It then passes powerful inner and
outer ECCs which can correct dropouts in the
reproduced signal. It further goes through an error
concealment circuit to have errors still remaining in
the signal rectified.
Output interface
Component video data is converted into serial data and
multiplexed with audio data and time code, then output
in the HD SDI format.
With an HD-SD converter board installed, the unit can
output both D1 SDI and analog composite signals.
Besides audio data is output as digital data multiplexed
with the HD SDI signal, it is also output via an AES/
EBU digital interface. Analog data converted from
digital data is also provided.
1-1
Chapter 1 Overview