360 Systems MAXX-6T - Manual (Page 20)

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Page 20 MAXX 6T Owner’s Manual
Embedded Audio Capability
When SDI embedded audio is selected, four audio channels are available for recording. Embedded
audio is always inserted in the video outputs. Note that discrete audio (analog or AES/EBU) is also
available on XLR connectors, at the same time embedded audio appears in the video stream.
Embedded audio has a 20-bit resolution. Refer to Using Embedded Audio on Page 66 for details on
using embedded audio.
Audio Word Size and Sample Rate
The MAXX 6T employs 24-bit audio A/D and D/A converters, and records audio into a 24-bit frame,
regardless of the word size received. The sample rate is fixed at 48K. When using the AES/EBU
digital input, the 48K sample rate of the incoming digital audio must be derived from the video
genlock reference. If not, or if a different sample rate is used, the MAXX 6T’s input sample rate
converters must be selected. Refer to Using Sample Rate Conversion on page 68.
Note:
Encoded audio streams, such as Dolby E® must be referenced to video genlock, and the input
sample rate converters must be disabled when recording such streams.
Serial Control Ports
Each of the MAXX 6T’s three 9-pin “D” connectors permits independent control of any of the three
video channels. They can accept serial commands in VDCP, Sony BVW or Odetics protocol. The
multiple serial ports allow simultaneous connection of an automation controller and a desktop
controller. See the chapter on Automation Control for further details.
Most broadcast automation systems, and some remote control panels, employ the VDCP protocol.
A list of supported VDCP commands will be found in APPENDIX K - SERIAL COMMAND
PROTOCOLS. Many controllers used for transport, instant replay, and edit control employ Sony
BVW or Odetics protocol.
GPI Control
The MAXX 6T provides six GPI inputs for control of machine functions, which appear on the 25-pin
GPI connector. This “General Purpose Interface” can be connected to switch contacts or an open-
collector transistor output. GPI inputs are programmable, and can provide machine control such as
PLAY, STOP, or RECORD through simple external switches.
The MAXX 6T also provides six GPI status outputs which may be used to confirm that a command
has been received, or for other purposes. The functions of these open-collector outputs are
programmable, and may be used to operate an LED, or they can be connected to a suitable logic
input. The pin-out for the GPI connector will be found in APPENDIX I on Page126.