Patent ID: 11929085
Assignee: DOLBY INTERNATIONAL AB
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A method of compressed-bitrate coding of audio data and generating enhancement metadata for controlling audio enhancement of the compressed-bitrate coded audio data in a decoder at a decoder side, including:
core encoding original audio data at a compressed bitrate to obtain encoded audio data;
generating, in an encoder, enhancement metadata to be transmitted to the decoder for controlling a type and/or amount of audio enhancement in the decoder after core decoding the encoded audio data; and
outputting the encoded audio data and the enhancement metadata to the decoder, wherein generating enhancement metadata includes:
core decoding the encoded audio data to obtain core decoded raw audio data;
inputting the core decoded raw audio data, companding control data, and a noise vector into an audio enhancer for processing the core decoded raw audio data based on candidate enhancement metadata for controlling the type and/or amount of audio enhancement of audio data that is input to the audio enhancer, wherein the companding control data includes information on a companding mode used for encoding the original audio data;
obtaining, as an output from the audio enhancer, enhanced audio data;
wherein the audio enhancer is trained using machine learning to generate enhanced audio from original audio, the companding control data, and the noise vector until a discriminator no longer distinguishes the original audio from the enhanced audio generated from the original audio;
determining a suitability of the candidate enhancement metadata based on the enhanced audio data; and
generating the enhancement metadata based on a result of the determination.