FIELD: physics.
SUBSTANCE: device decodes a bitstream containing audio data and volume metadata containing a reference loudness value to generate an audio output signal. The device comprises a signal processor comprising a gain control device configured to adjust the output audio signal level. The gain control device includes a reference volume decoder configured to generate a loudness value, a gain calculator configured to calculate the gain value based on the loudness value and based on the sound power control value, and a volume processor configured to control the volume of the audio output signal based on the gain value.
EFFECT: providing the ability to normalize the playback volume both the content containing metadata of loudness, and the content that does not contain volume metadata.
16 cl, 5 dwg
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