Enhancements to DRC
Frank Baumgarte, Apple, presented
m32271
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Dynamic Range Control Working Draft 0
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Frank Baumgarte, David Singer, Fabian Küch, Michael Kratschmer, Christian Uhle, Bernhard Neugebauer, Michael Meier,
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The presenter gave an overview of WD0:
The Main features
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Multiple DRC sets for various application scenarios
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Clipping prevention
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Loudness normalization
Flexible technology
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DRC can be in time domain or in subband domain
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Applied before of after downmix
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DRC meta data can be in audio elementary stream or in MPEG-4 file
DRC Tool Summary
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Flexible configuration that is universally applicable
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High quality dynamics compression for various application scenarios
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Advanced loudness normalization, including clipping prevention
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Efficient with respect to bitrate
Werner Oomen, Philips, noted that there seems to be technology that implements what is requested in the 3D Audio workplan and also technology that goes beyond what was requested.
The presenter will make his presentation slides available.
The presenter stated that he would make available a list of additional technology (beyond what was requested in the workplan) no later than Tuesday morning.
Frank Baumgarte, Apple, presented
m32273
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Dynamic Range Control RM0 reference software
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Frank Baumgarte
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The software is composed of two modules:
Encoder that takes as input multiple DRC gain sequence sets with gain coefs at the sampling frequency and generates a complete bit-efficient bitstream uni_drc() bitstream.
Decoder that decodes a uni_drc() bitstream in response to the user’s selected DRC Type or application scenario, e.g. “Night mode.” Single-band is tested and working. Multi-band code is present but not tested.
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