1-1 Features

1-1-1 Features of the HDW-F500

The HDW-F500 is a HD digital videocassette recorder using the HDcam format. Comparable to a conventional digital Betacam in size, weight, and ease- of-use, the HDW-F500 is a small, lightweight HD digital VTR using integrated circuit technology.

HDcam Format

The HDcam format was developed from the digital Betacam format, and retains the same ease of use of digital Betacam, while yielding high performance HD digital recording and playback. The HDcam format uses the following technologies:

•Bandwidth restrictions and a new coefficient recording system, compressing the data by a factor of seven.

•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.

Together, these technologies allow 120 minutes of recording on a (large size) 1/2-inch HDcam cassette, the same size as a conventional digital Betacam cassette.

Digital Signal Processing

In an HDcam VTR, the signal processing takes a 4:2:2 component signal which has been quantized according to ITU-R709/SMPTE 274M/SMPTE 260M(BTA S- 002B) standards, and subjects it to 3:1:1 bandwidth restriction, and then further applies data compression by using a coefficient recording system. Audio signals are processed using full bit processing based on the AES/EBU format.

Input interface

The input interface is based on the SMPTE 291M/ 292M/299M(BTA S-004B/-005B/-006B) /ARIB STD B-4 HD component SDI(Serial Digital Interface) format, allowing a single BNC coaxial cable to carry one component video signal, four digital audio channels, and time code in time division multiplex; this is separated for conversion to parallel data.

The interface can be used to record audio data from an AES/EBU digital interface or digitally converted analog signals.

Bit rate reduction encoder

The component video signal data is compressed by a factor of about four by a process in which it is subjected to frame shuffling, blocking, DCT (discrete cosine transform), quantizing adjustment, and variable length word encoding. This is the core of the newly developed coefficient recording system.

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. The Reed- Solomon code is 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 format adopts a scrambled NRZI channel coding system for off-track and noise characteristics.

Playback signal processing

The playback digital data is equalized by equalizer circuits and error-corrected by powerful inner and outer ECC, which can correct most data disturbed by noise and dropouts in the reproduced signal. Data that cannot be completely corrected in this way is passed through a bit reduction decoder and corrected by an error concealment circuit.

Output interface

Component video data are converted into serial data and multiplexed with audio data and time code, then output in the HD SDI format.

By installing an HD-SD Converter Board (HKDV- 501A; optional accessory), D1 SDI or D2 SDI and analog composite outputs are also available.

Audio output can be data from the AES/EBU digital interface or analog audio converted from digital signals.

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