HID Usage Tables Document 1.1 - C. Scott Ananian

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70 Universal Serial Bus HID Usage Tables14.12.1 Audio ChannelsWhere:• A monophonic system is a 1-channel system that would be represented by volume, mute and tonecontrols in the top-level collection.• Stereo is a 2-channel system. Normally volume, balance, mute and tone controls in the top-levelcollection would represent this configuration. However if a device provided individual controls forthe right and left channels then these controls would be found in their respective Right Channel andLeft Channel collections.• Dolby Surround is a 3-channel system with Right, Left, and Rear Channels. This configuration isvery similar to a stereo configuration however any controls that only effected the rear speakerswould be found in a Surround Channel collection.• Dolby Pro-Logic surround is a 4-channel system with Right, Left, Center, and Rear Channels.Similar to Dolby Surround however any controls that only effected the center speaker would befound in a Center Front Channel collection.• Dolby Digital is a 6-channel system with 3 front channels (Right, Left and Center), 2 surroundchannels (Rear Right and Rear Right), and a Subwoofer (LFE) Channel. Similar to Dolby Pro-Logic however any controls that only effected the subwoofer speaker would be found in a LowFrequency Enhancement Channel collection.In both implementations of Dolby Surround and Dolby Pro-Logic the Rear channel is actually a monophonicbandwidth-limited (7 kHz) channel that is often implemented as two separate speakers, right and left. Bothspeakers receive the same source.Master or system-wide controls associated with all channel positions will be found in the top-level collectionof the consumer control.Speaker SystemChannel LeftChannel RightChannel CenterChannel FrontChannel Center FrontCL – This collection is used to define controls that effect all channels of anindividual speaker system if the device contains controls for more than onespeaker system. Note that the controls defined in the top-level collection willbe the true master controls, effecting all speaker systems. This collection cancontain any of the following Channel collections.CL – A collection of controls associated with the Left channel.CL – A collection of controls associated with the Right channel.CL – A collection of controls associated with the Center channel.CL – A collection of controls associated with the Front channels. To providemore detail on controls, this collection may optionally contain Channel Left,Channel Right, and Channel Center collections The Audio class notation forthis Channel Front(Channel Left) is L. The Audio class notation for thisChannel Front(Channel Right) is R. The Audio class notation for this ChannelFront(Channel Center) is C.CL – A collection of controls associated with the Center Front channels. Toprovide more detail on controls, this collection may optionally containChannel Left and Channel Right collections The Audio class notation for thisChannel Center Front(Channel Left) is LC (left of center in front). The Audioclass notation for this Channel Center Front(Channel Right) is RC (right ofcenter in front).Version 1.1 April 8, 1999
Universal Serial Bus HID Usage Tables 71Channel SideChannel SurroundChannel LowFrequencyEnhancementChannel TopChannel UnknownCL – A collection of controls associated with the Side or wall channels. Toprovide more detail on controls, this collection may optionally containChannel Left and Channel Right collections The Audio class notation for thisChannel Side(Channel LeCL – A collection of controls associated with the Surround channels. TheAudio class notation for this Channel Surround is S. To provide more detailon controls, this collection may optionally contain Channel Left and ChannelRight collections The Audio class notation for this ChannelSurround(Channel Left) is LS. The Audio class notation for this ChannelSurround(Channel Right) is RS.CL – A collection of controls associated with the Low FrequencyEnhancement or Subwoofer channel. The Audio class notation for thischannel is LFE.CL – A collection of controls associated with the Top or overhead channel.The Audio class notation for this channel is T.CL – A collection of controls associated with an unknown channel position.14.13 PC TheatreMedia Select SAPSub-channelSub-channel IncrementSub-channel DecrementAlternate-audioIncrementAlternate-audioDecrementSel - Select Tuner using Secondary Audio Program (SAP) information.LC - Digital TV sub-channel selection control where the range of possiblevalues is equal to the number of sub-channels supported by the device.OSC - Digital TV sub-channel control where each activation of the controlincrements the current sub-channel selection to the next available subchannel.OSC - Digital TV sub-channel control where each activation of the controldecrements the current sub-channel selection to the next available subchannel.OSC - Digital TV alternate-audio control where each activation of the controlincrements the current alternate-audio selection to the next availablealternate-audio.OSC - Digital TV alternate-audio control where each activation of the controldecrements the current alternate-audio selection to the next availablealternate-audio.14.14 Programmable ButtonsProgrammableButtonsNAry - The user defines the function of these buttons to control softwareapplications or GUI objects. The Programmable Buttons named arraycontains Button Page usages as selectors.Version 1.1 April 8, 1999
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HID Usage Tables Document 1.1 - C. Scott Ananian

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