DP 572The Dolby DP572 decodes Dolby E encoded program material for use in broadcast and postproduction facilities prior to final DTV and HDTV transmission.
The DP572 Dolby® E Decoder is designed to ease the transition by DTV broadcasters and program producers from two-channel to multichannel audio. The DP572 decodes up to eight channels of high-quality audio, plus Dolby Digital metadata, from a Dolby E signal encoded on a single AES3 pair, external fiber, satellite link, digital videotape, digital audiotape, or from a video server. It is easily integrated into postproduction and broadcast facilities. The DP572 can accept both PCM and Dolby E signals and can switch automatically to provide seamless integration of multichannel and archived stereo programming.
Dolby E Advantages
With Dolby E, coded audio frames match video frames, ensuring that audio-follow-video edits are free of mutes, glitches, or other aberrations. This makes it possible to switch, route, and perform edits directly on the digital bitstream without decoding and reencoding. Dolby E audio also carries Dolby Digital metadata generated by the program’s producers for final delivery to the home viewer’s Dolby Digital decoder.
In multichannel programming, a “5.1 + 2” Dolby E configuration is typically used, with six of the eight channels carrying a 5.1 program and the other two an Lt/Rt (matrix surround-encoded) or stereo two-channel program. Alternate channel configurations are available for multilingual or other specialized applications. Front-panel status LEDs and the LCD indicate the configuration of the Dolby E source signal.
In addition to inputs for Dolby E audio, a second input, PCM delay, has multiple functions. These include insertion of a voiceover into the decoded Dolby E program, insertion of local stereo audio without the need for additional equipment, or automation of switching between stereo and multichannel programming within a transmission chain. When using this input, the DP572 creates appropriate metadata to automate the rest of the Dolby broadcast audio chain. The DP572 requires a standard video black reference signal, and can also be utilized in 24-frame applications when accompanied with the DP579 Dolby E Tri-Level Sync Interface. Outputs are provided for SMPTE timecode.
For a complete Dolby E broadcast solution, the DP571 Dolby E Encoder is the ideal companion unit.
Audio Coding Algorithm
Dolby E Program Configurations
User-selectable: 5.1; 3 × 2; 5.1 + 1 + 1; 6 × 1; 5.1 + 2; 8 × 1; 4 × 2; Others selectable
Audio Sampling Rate
Video Frame Rates
29.97 fps (NTSC)
25 fps (PAL)
23.98, 24, 30 fps (requires DP579 Dolby E Tri-Level Sync Interface)
20 Hz to 20 kHz, ±0.25 dB
<0.01% at 1 kHz
<0.02%, 20 Hz to 20 kHz
Encoding: fixed, one video frame PCM delay channel: fixed, one video frame PCM delay channel: fixed, one video frame or minimal delay
90-264 VAC, 50-60 Hz, auto-sensing, 15 W maximum; designed to operate from a centrally switched power source
Dimensions and Weight
1-U rackmount: 44 × 483 × 324 mm (1.75 × 19 × 12.75 inches)
Net: 2.7 kg (5.9 lb)
Operating: 0°C-50°C (32°F-122°F), natural convection cooling; 0%-98% relative humidity (noncondensing)
Nonoperating: ?20°C to 70°C (?4°F to 158°F)
North America: This unit complies with the limits for a Class A digital device pursuant to Part 15 of the FCC rules and Industry Canada ICES-003 Class A requirements. It is UL Listed for the US and Canada.
Europe: This unit complies with the requirements of Low Voltage Directive 73/23/EEC and EMC Directive 89/336/EEC and carries the CE marking accordingly.