Dolby E/AC-3 Decoder

The 520DD-AESU is a professional Dolby audio decoder that automatically detects Dolby-E, Dolby Digital (AC3), and PCM streams in the AES input, and translates them to PCM (linear) audio. Up to 8 discrete audio channels may be contained in 1 AES stream when encoded as Dolby-E, yielding up to 4 AES PCM outputs. A fifth stereo pair is obtained as the downmix of the above multi-channel audio. It can be mono, stereo or surround (ProLogic) and may optionally be routed to the output. So that the multi-channel outputs in PCM form can be re-assembled back into Dolby-E or Dolby Digital further downstream, an additional output with metadata is provided. It contains information about the assumed inter-channel relationships (whether they are 5.1, or 4 stereo pairs, etc.), their expected dialogue levels, etc. Dolby-E is capable of carrying LTC data embedded within its stream. It can be selected as an output, instead of metadata. For lipsync cohesion and ease of editing, Dolby-E data is organized in blocks with lengths matching associated video frame. The decoder will match the beginning of each output block with the start of video, as provided with the genlock input. Additional delay can be dialed up by the user, up to 3 seconds. Reference video frame rate must match that assumed by the Dolby-E stream. An extra AES input is provided that can be configured as a backup channel, in the event the primary is lost, or as a voice-over source. VistaLINK® enables control and configuration capabilities via Simple Network Management Protocol (SNMP). This offers the flexibility to manage the module status monitoring and configuration from SNMP enabled control systems such as Evertz VistaLINK® PRO locally or remotely. The 520DD-AESU is housed in the 3RU 500FR exponent frame that will hold up to 16 modules.