CineAlta products are Sony’s response and commitment to the ITU 709 global standard for international high-definition (HD) program origination. HD programming has rapidly entered the mainstream, and the HDCAM format has become the most popular format supporting it. That popularity has escalated demands for even higher quality and greater storage capacity – enough to support extremely high-quality digital production, high-resolution film transfer work, sophisticated graphics recording, and multi-channel audio mastering.
Responding to the requests for more headroom in digital recordings by many prominent content producers, Sony has introduced HDCAM-SR. Developed using the very latest, cutting-edge technology, HDCAM-SR offers greater storage capacity, higher data-transfer rates, and more audio channels than any other products on the market.
HDCAM-SR products are capable of recording either RGB 4:4:4 or component 4:2:2 high-definition video at an astonishing net video rate of 440 megabits-per-second, providing a combination of higher bandwidth, higher bit depth, and lower compression than any previous half-inch or quarter-inch HD VTR. As a result, the HDCAM SR recorders capture the full detail of the Common Image Format 1920(H) x 1080(V) sampling structure without pre-filtering or sub-sampling. HDCAM SR recording also capitalizes on the unique new scalable MPEG-4 studio profile compression algorithm to achieve a mild compression ratio.
Key features of HDCAM-SR include:
Creating Visually Lossless Images: The MPEG-4 Studio Profile (SP)
Another industry first from Sony is an integrated video encoding/decoding chipset that conforms to the MPEG-4 SP (Studio Profile: ISO/IEC 14496-2:2001-1). The Studio Profile was created to specifically address the requirements of high-resolution image-production applications. It is free from GOP (Group Of Pictures) structures, and is scalable in its pixel count (SDTV, HDTV, Film-resolution data), bit depth (10- or 12-bit), and colour resolution (component or RGB).
In order to achieve maximum compression efficiency, the HDCAM-SR format uses intra-frame compression for progressive images. Intra-field compression is used for interlaced images. Special attention has been paid to multi-generation dubbing performance and, in common with industry-standard Digital BETACAM VTRs, the SRW-5000 HDCAM-SR VTR is capable of consistent dubbing without using a separate SDTI interface (native stream). This is only possible thanks to the high performance of the MPEG-4 SP, which offers reproduction of visually lossless images.
More Data, Same Long Running Time: The New Footprint
Each picture frame consists of 24 helical tracks (or 12 tracks per segment/field), in which data is shuffled to protect the recording from occasional burst errors. Recordings are further protected by highly robust error-correction and concealment techniques perfected through years of Sony digital-VTR development. Thanks to the finer track pitch and shorter minimum recording wavelength, the data-packing density of the HDCAM-SR format is 3.5 times that of the HDCAM format. Frame-accurate editing is guaranteed by the intelligent allocation of pilot signals for precise head-to-tape tracking.
More Power, More Stability: The New Tape Formula
A newly developed, ultra-fine-grain magnetic particle creates the very thin magnetic layer required to achieve the minimum recording wavelength of 0.29µ. This minimum wavelength allows the tape to hold more data and increases the tape transfer rate, resulting in increased performance. Not only that, but stable and consistent playback results are provided through a new proprietary manufacturing process that minimizes tape deformation. What’s more, because the tape medium is designed with a highly rigid new base film material treated with antioxidants, the tape is also ideal for archiving purposes.
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