Patent ID: 9715880
Date: 2017-07-25
CPC Classifications: G10L,H04S

Claim:
1. An audio encoding device that generates a bitstream indicative of a downmix signal and spatial metadata for generating a multi-channel upmix signal from the downmix signal; wherein the audio encoding device: generates the downmix signal from a multi-channel input signal; wherein the downmix signal comprises m channels and wherein the multi-channel input signal comprises n channels; n, m being integers with m<n; determines the spatial metadata from the multi-channel input signal; and determines one or more control settings for the parameter processing unit based on one or more external settings; wherein the one or more external settings comprise a target data-rate for the bitstream and one or more of: a sampling rate of the multi-channel input signal, the number m of channels of the downmix signal, the number n of channels of the multi-channel input signal, and an update period indicative of a time period required by a corresponding decoding system to synchronize to the bitstream; and wherein the one or more control settings comprise a maximum data-rate for the spatial metadata and one or more of: a temporal resolution setting indicative of a number of sets of spatial parameters per frame of spatial metadata to be determined, a frequency resolution setting indicative of a number of frequency bands for which spatial parameters are to be determined, a quantizer setting indicative of a type of quantizer to be used for quantizing the spatial metadata, and an indication whether a current frame of the multi-channel input signal is to be encoded as an independent frame.