The 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.
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