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Dolby Laboratories DP570 Stereo System User Manual

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A Guide to Dolby Metadata Parameter Definitions

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DP570 Multichannel Audio Tool User’s Manual 99

Copyright Bit

ThisparameterindicateswhethertheencodedDolbyDigitalbitstreamiscopyright

protected.IthasnoeffectonDolbyDigitaldecodersanditspurposeispurelytoprovide

information.

Original Bitstream

ThisparameterindicateswhethertheencodedDolbyDigitalbitstreamisthemaster

versionoracopy.IthasnoeffectonDolbyDigitaldecodersanditspurposeispurelyto

provideinformation.

DC Filter

ThisparameterdetermineswhetheraDC‐blocking3Hzhighpassfilterisappliedtothe

maininputchannelsofaDolbyDigitalencoderpriortoencoding.Thisparameterisnot

carriedtotheconsumerdecoder.ItisusedtoremoveDCoffsetsintheprogramaudioand

wouldonlybeswitched

offinexceptionalcircumstances.

Lowpass Filter

Thisparameterdetermineswhetheralowpassfilterisappliedtothemaininputchannels

ofaDolbyDigitalencoderpriortoencoding.Thisfilterremoveshigh‐frequencysignals

thatarenotencoded.Atthesuitabledatarates, thisfi lteroperatesabove20kHz.Inallcases 

Table D-14 Copyright Bit Settings

Copyright Bit Setting

Yes

No

Table D-15 Original Bitstream Settings

Original Bitstream

Setting

Yes

No

Note:TheparametersDCFilter,LowpassFilter,LFELowpassFilter,Surround3dB

Attenuation,andSurroundPhaseShiftappearaftertheExtendedBSIparameters

onDolbyEandDolbyDigitalequipmentmenus.

Table D-16 DC Filter Settings

DC Filter Setting

Enabled

Disabled

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