java barcode reader sdk Figure 6-71 The Copyright and Content checkboxes in Software

Maker Code39 in Software Figure 6-71 The Copyright and Content checkboxes

Figure 6-71 The Copyright and Content checkboxes
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Dolby MetaData can contain a flag bit to indicate if the audio content of the bitstream is currently under Copyright The Default is on
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To turn this flag off, click on the Copyright Exists checkbox to uncheck it Click again to check it if needed (see Fig 6-71)
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the decoder if the Audio Production Information is checked on Set the Room Type, based on mixing room information This parameter defines the Type of mixing room or stage used during the surround mix, but is only referenced by the decoder if the Audio Production Information is checked on The Large room X-curve parameter would be checked if the audio file was created in a traditional theatrical mixing (dubbing) stage, whose audio characteristics follow the Academy Curve a specific equalization curve that attenuates high frequencies to emulate the playback characteristics of a movie theater
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If this is an Original Bitstream, check the checkbox
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Dolby MetaData can contain a flag bit to indicate if the audio content of the bitstream is the Original Dolby Bitstream, or a copy (see Figure 6-71) The Default setting is on, meaning this is the original bitstream created of this content To denote this is not the original bitstream, click on the Content is Original checkbox, to uncheck it Click again to check it if needed (see Figure 6-71)
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If appropriate, check the Audio Production Information box
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Settings in the Preprocessing Tab (in Detail)
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Figure 6-72b The Preprocessing Tab Figure 6-72a Setting Audio Prod n Info
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The default of this parameter is OFF, but by turning it ON, it is possible to advise Dolby Digital decoders that the accompanying reference information is valid, and it may be used to adjust playback levels (see Fig 6-72a) Set the Peak Mixing Level, based on mixing information This parameter defines the Peak mixing level used during the surround mix, but is only referenced by
Setting the Compression Factor
Dolby encoders can apply different types of Program Compression to assist in leveling out the dynamic range (not always a good thing), depending on the kind of program you are encoding Film, Music, or Speech You may find, however, that turning Compression off may be the right solution for material that is already dynamically leveled, or doesn t have large dynamic range swings
Preparing Audio Assets
To apply a Program Compression Preset, or to deselect Compression, click on the Compression Preset pop-up (as shown in Fig 6-73), and drag to select your choice The default is Film standard Compression, and that may not be proper for your particular content, especially if it is music, and already levels off nicely in a mix
Verify the setting is not on (not enabled see Fig 6-74) To disable the RF Overmodulation Protection bit, deselect the check box for this parameter (as shown in Fig 6-74) NOTE that in Compressor 2, this should default to off Some earlier versions of APack defaulted to on
Figure 6-73 Setting the program Compression parameter
Figure 6-74 Setting the RF Overmodulation parameter
Setting the RF Overmodulation Protection
According to Dolby Labs, this parameter is designed to protect against overmodulation when a decoded Dolby Digital bitstream is RF modulated When enabled, the Dolby Digital encoder includes pre-emphasis in its calculations for RF Mode compression The parameter has no effect when decoding using Line Mode compression
NOTE! Except in rare cases, this parameter should be disabled
Setting the Digital Deemphasis Parameter
Believe it or not, there is NO official Dolby explanation for this parameter in the Dolby Metadata Guide (See Fig 6-75)
Compressor 2 can set or disable the RF Overmodulation Protection bit through a simple checkbox Check it carefully, as it usually defaults to on off is the preferred state
Figure 6-75 Setting the Digital Deemphasis parameter
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Since the parameter defaults to off, it s best to leave it that way
operates above 20 kHz In all cases, it prevents aliasing on decoding and is normally switched on This parameter is not passed to the consumer decoder To deselect full Bandwidth Channel LowPass Filter (which defaults to on ), click on the checkbox to deselect it (see Fig 6-77)
Setting the Low-Pass Filter (for LFE Channel)
According to Dolby Labs, this parameter determines whether a 120 Hz 8th order low-pass filter is applied to the LFE channel input of a Dolby Digital encoder prior to encoding It is ignored if the LFE channel is disabled This parameter is not sent to the consumer decoder The filter removes frequencies above 120 Hz that would cause aliasing when decoded This filter should only be switched off if the audio to be encoded is known to have no signal above 120 Hz To deselect LFE Low-Pass Filter (which defaults to on ), click on the checkbox to deselect it (see Fig 6-76)
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