METHOD AND APPARATUS FOR NORMALIZED AUDIO PLAYBACK OF MEDIA WITH AND WITHOUT EMBEDDED LOUDNESS METADATA ON NEW MEDIA DEVICES.

摘要

Provided is a decoder device for decoding a bitstream so as to produce therefrom an audio output signal, the bitstream comprising audio data and optionally loudness metadata containing a reference loudness value, the decoder device comprising: an audio decoder device configured to reconstruct an audio signal from the audio data; and a signal processor configured to produce the audio output signal based on the audio signal; wherein the signal processor comprises a gain control device configured to adjust a level of the audio output signal; wherein the gain control device comprises a reference loudness decoder configured to create a loudness value, wherein the loudness value is the reference loudness value in case that the reference loudness value (4) is present in the bitstream; wherein the gain control device comprises a gain calculator configured to calculate a gain value based on the loudness value and based on a volume control value, which is provided by an external user interface allowing a user to control the volume control value; wherein the gain control device comprises a loudness processor configured to control the loudness of the audio output signal based on the gain value.