Dolby Laboratories DP570 4.13 Using an External Shaft Encoder to Control Master Volume

38 Dolby® DP570 Multichannel Audio Tool User’s Manual
Using the DP570 Features Using an External Shaft Encoder to Control Master Volume
TheDP570inputrouterenablesyoutorerouteinputchannelstoconformtothe
automaticallyassignedchannelmapping.TheinputrouterisactiveevenwhenEmulator
Bypassisenabled.
TheSetupRouterwindowintheDolbyRemote570allowsyoutovieworchangerouter
settings.Toopenthewindow,clickRouterontheapplicationbuttonbar.
Youcanalsoresaveandrenamethefactoryinputrouterpresets.Thefactorypresets,shown
inTable 4 ‐4,matchexistingconventionsformultichannelmediachannelorder.Preset1
workswithatapeconformingtoSMPTEStandards320Mand320M‐A.Preset3workswith
atapeconformingtoSMPTEStandard320M‐B.
4.13 Using an External Shaft Encoder to Control Master Volume
ThemastervolumefunctionisavailableonDP570sthathavetheCat.No.548Analog
OptionCardinstalled.TheGPI/Oporthasthreepinsthatallowcontrolofmastervolume
remotelybyusingashaftencoder.Table 4‐5describestheinterface.
Note:Theonlyfour‐channelmodesupportedis3/1.Ifyouwishtouse2/2channelmode,
werecommendsettingtheprogramconfigurationto5.1andmutingthe
unnecessarychannels.
Table 4-4 Default Router Presets
Digital
Input Preset 1 Output Preset 2 Output Preset 3 Output Preset 4 Output
11 1 1 1
22 3 5 2
33 2 3 5
44 6 6 6
55 5 2 3
66 4 4 4
77 7 7 7
88 8 8 8
Table 4-5 Shaft Decoder Signal Descriptions
Signal Pin Description
Shaft121Shaftencoderinput.Twosquarewavesinaquadraturephaserelationship:
Shaft0leadsShaft1by90degrees:volumeincreases.
Shaft0lagsby90degrees:volumedecreases.
Shaft020
ShaftPresent 22 Groundthispintoactivatecontrolviashaftencoder.Pulledhighinternally
(10kto+5V).