Automatic configuration of metadata for use in mixing audio programs from two encoded bitstreams

摘要

An audio coding system uses mixing metadata to control the attenuation of a main audio program that is subsequently mixed with an associated audio program. The value of the attenuation is calculated by analyzing the estimated loudness of the main and associated audio programs.

主权项

1. A method, performed by one or more devices, for encoding audio signals, wherein the method comprises:
receiving one or more main audio signals that represent a main audio program and receiving one or more associated audio signals that represent an associated audio program; encoding the one or more main audio signals to generate a main encoded audio signal and encoding the one or more associated audio signals to generate an associated encoded audio signal; generating audio mixing metadata in response to estimated loudness of the main audio program and estimated loudness of the associated audio program, wherein one or more audio signals to be decoded from the main encoded audio signal and one or more audio signals to be decoded from the associated audio signal are to be mixed according to the audio mixing metadata; wherein the audio mixing metadata specify an attenuation level for the one or more audio signals to be decoded from the main audio program prior to mixing; and assembling the main encoded audio signal, the associated encoded audio signal and the audio mixing metadata into an output encoded signal.