Patent ID: 9578435
Date: 2017-02-21
CPC Classifications: G10L,H04S

Claim:
1. An apparatus for generating one or more audio output channels, wherein the apparatus comprises: a parameter processor for calculating mixing information, and a downmix processor for generating the one or more audio output channels, wherein the downmix processor is configured to receive a data stream comprising audio transport channels of an audio transport signal, wherein one or more audio channel signals are mixed within the audio transport signal, wherein one or more audio object signals are mixed within the audio transport signal, and wherein the number of the audio transport channels is smaller than the number of the one or more audio channel signals plus the number of the one or more audio object signals, wherein the parameter processor is configured to receive downmix information indicating information on how the one or more audio channel signals and the one or more audio object signals are mixed within the audio transport channels, and wherein the parameter processor is configured to receive covariance information, and wherein the parameter processor is configured to calculate the mixing information depending on the downmix information and depending on the covariance information, and wherein the downmix processor is configured to generate the one or more audio output channels from the audio transport signal depending on the mixing information, wherein the covariance information indicates a level difference information for at least one of the one or more audio channel signals and further indicates a level difference information for at least one of the one or more audio object signals, and wherein the covariance information does not indicate correlation information for any pair of one of the one or more audio channel signals and one of the one or more audio object signals, wherein the one or more audio channel signals are mixed within a first group of one or more of the audio transport channels, wherein the one or more audio object signals are mixed within a second group of one or more of the audio transport channels, wherein each audio transport channel of the first group is not comprised by the second group, and wherein each audio transport channel of the second group is not comprised by the first group, and wherein the downmix information comprises first downmix subinformation indicating information on how the one or more audio channel signals are mixed within the first group of the audio transport channels, and wherein the downmix information comprises second downmix subinformation indicating information on how the one or more audio object signals are mixed within the second group of the one or more audio transport channels, wherein the parameter processor is configured to calculate the mixing information depending on the first downmix subinformation, depending on the second downmix subinformation and depending on the covariance information, wherein the downmix processor is configured to generate the one or more audio output signals from the first group of audio transport channels and from the second group of audio transport channels depending on the mixing information, wherein the downmix processor is configured to receive a first channel count number indicating the number of the audio transport channels of the first group of audio transport channels, and wherein the downmix processor is configured to receive a second channel count number indicating the number of the audio transport channels of the second group of audio transport channels, and wherein the downmix processor is configured to identify whether an audio transport channel within the data stream belongs to the first group or to the second group depending on the first channel count number or depending on the second channel count number, or depending on the first channel count number and the second channel count number.