Sony HDCAM HDW-F500, Брошюра и характеристики, Страница: 8 / 14

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The HDCAM format
The HDCAM format maintains the same footprint for
both progressive and interlaced signals. Every frame is
treated as a single entity. Hence, recording of signals
with different frame rates is achieved by efficient and
automatic adjustment of the tape transport and drum
rotation speeds. Each picture frame is recorded over 12
helical tracks.
The format also includes a newly developed digital
signal processing with advanced error correction and
error concealment. The error concealment system is
powerful enough to provide superb picture quality
even if one of the 4-playback heads is accidentally
damaged. In addition, the 13.5 µm tape thickness
ensures stable and reliable recording.
24P HDCAM allows a single highest resolution
program master to be created, from which all other
video formats (or film recordings) can be made on a
global basis. Simply stated, this is the first singular
digital format ever created specifically to suit the needs
of Motion Picture, HDTV, television, DVD, Internet,
future E-Cinema and all other electronic and digital
distribution media.
In order to retain system compatibility of progressive
frames with interlaced signals, the 24P system handles
each progressive frame as two segments separated in
time by 1/48th of a second. A complete progressive
picture frame from the acquisition device (telecine,
camcorder, studio camera, etc.) is divided into two
segments and as such travels through the HD SDI
base-band interface (or through the SDTI infrastructure
in a compressed form) in the same manner as an
interlaced signal. Although the segmented signal
structurally resembles an interlaced signal, it should
NOT be confused with interlaced images. The
segmented frame format is approved by the ITU
Rec.709-3 and is supported by most of the major
manufacturers. The official ITU nomenclature for this
signal is 24PsF – Progressive, Segmented Frames.