METADATA FOR LOUDNESS AND DYNAMIC RANGE CONTROL
First Claim
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1. A method for encoding audio signal, comprising:
- applying an audio normalization gain value to an audio signal to produce a normalized signal; and
thenprocessing the normalized signal to compute a plurality of dynamic range control (DRC) gain values for the normalized signal, wherein the DRC gain values are computed in accordance with a selected one of a plurality of pre-defined DRC characteristics;
encoding the audio signal; and
providing the DRC gain values as metadata associated with the encoded audio signal.
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Abstract
An audio normalization gain value is applied to an audio signal to produce a normalized signal. The normalized signal is processed to compute dynamic range control (DRC) gain values in accordance with a selected one of several pre-defined DRC characteristics. The audio signal is encoded, and the DRC gain values are provided as metadata associated with the encoded audio signal. Several other embodiments are also described and claimed.
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Citations
19 Claims
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1. A method for encoding audio signal, comprising:
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applying an audio normalization gain value to an audio signal to produce a normalized signal; and
thenprocessing the normalized signal to compute a plurality of dynamic range control (DRC) gain values for the normalized signal, wherein the DRC gain values are computed in accordance with a selected one of a plurality of pre-defined DRC characteristics; encoding the audio signal; and providing the DRC gain values as metadata associated with the encoded audio signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A digital audio encoder apparatus, comprising:
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a normalizer that is to apply an audio normalization gain value to an audio signal so as to produce a normalized audio signal; a DRC processor that is to process the normalized audio signal to compute a plurality of dynamic range control (DRC) gain values for the normalized audio signal, wherein the DRC gain values are computed in accordance with a selected one of a plurality of pre-defined DRC characteristics; an encoder to receive the audio signal; and means for providing the DRC gain values as metadata associated with the encoded audio signal. - View Dependent Claims (10, 11, 12, 13)
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14. A method for decoding audio, comprising:
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receiving an encoded audio signal; receiving metadata associated with the encoded audio signal, the metadata including a plurality of dynamic range control (DRC) gain values; decoding the encoded audio signal to produce a decoded audio signal; selecting a current DRC characteristic from amongst a plurality of available DRC characteristics, and modifying the DRC gain values based on the current DRC characteristic; and applying the modified DRC gain values to the decoded audio signal to produce a DRC adjusted audio signal. - View Dependent Claims (15, 16, 17)
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18. A digital audio decoder apparatus, comprising:
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a decoder that is to receive an encoded audio signal and produce decoded audio signal; a DRC processor that is to receive metadata which is associated with the encoded audio signal, wherein the metadata includes a plurality of dynamic range control (DRC) gain values, the DRC processor to select a current DRC characteristic from amongst a plurality of stored DRC characteristics and modify the DRC gain values based on the current DRC characteristic; and a multiplier that is to apply the modified DRC gain values to the decoded audio signal to produce DRC adjusted audio signal. - View Dependent Claims (19)
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Specification