360 Systems MAXX Operation Manual

Contents

360 Systems MAXX Operation Manual Manual pdf 26 page image

24 Hardware InterfaceAES/EBU) is also available on XLR connectors, at the same time embedded audio appears in thevideo stream. Embedded audio has a 20-bit resolution.Audio Word Size and Sample RateThe Image Server employs 24-bit audio A/D and D/A converters, and records audio intoa 24-bit frame, regardless of the word size received. The sample rate is fixed at 48K. Whenusing the AES/EBU digital input, the 48K sample rate of the incoming digital audio must bederived from the video genlock reference. If it is not, or if a different sample rate is used, theImage Server’s input sample rate converters must be selected.Encoded audio streams such as Dolby E® must be referenced to the video genlock, andthe input sample rate converters must be disabled when recording such streams.Analog/Digital Audio SelectionThe following drawing illustrates jumper positions to select between analog or digitalaudio. Note that each output may be individually selected. As described earlier, when analogaudio is selected, only two channels are available, while selection of AES/EBU digital audioprovides two stereo pairs, one on each XLR connector. Both jumpers for each channel (Left &Right, or Main & Aux) must be set together, either analog or digital. The Image Server must bepower cycled for jumper changes to take effect. For more detail, see Analog/Digital AudioSelection in the Maintenance chapter.DIGITALANALOGJUMPER BLOCK PAIR SHOWNIN ANALOG POSITIONJUMPER BLOCK PAIR SHOWNIN DIGITAL POSITIONGAIN ADJUSTFigure 1: Jumper location on audio card for selection of analog or digital audio.Serial Control PortsEach of the Image Server’s three 9-pin “D” connectors permits independent control ofany of the three video channels. They can accept serial commands in VDCP, Sony BVW orOdetics protocol. The multiple serial ports allow simultaneous connection of an automationcontroller and a desktop controller. See the chapter on Automation Control for further details.Most broadcast automation systems, and some remote control panels, employ theVDCP protocol. A list of supported VDCP commands will be found in Appendix B.