Patent ID: 8612214

Claim:
An encoder for encoding an audio signal, the audio signal comprising components in a first frequency band and components in a second frequency band, the encoder comprising: a core coder for encoding the components in the first frequency band to acquire an encoded audio signal; an envelope data calculator for calculating bandwidth extension (BWE) data based on the components in the second frequency band, the envelope data calculator comprising an apparatus for generating bandwidth extension output data for the audio signal, the bandwidth extension output data being adapted to control a synthesis of the components in the second frequency band, the apparatus comprising: a spectral envelope data calculator for calculating spectral envelope data of the second frequency band; a noise floor measurer for measuring noise floor data of the second frequency band for a time portion of the audio signal; a signal energy characterizer for deriving energy distribution data, in addition to the spectral envelope data, the energy distribution data characterizing an energy distribution in a spectrum of the time portion of the audio signal; and a processor for combining the noise floor data, the energy distribution data and the spectral envelope data to obtain the bandwidth extension output data, wherein the bandwidth extension output data comprise the noise floor data the energy distribution data and the spectral envelope data; and a bitstream payload formatter adapted for outputting a coded audio stream by combining the bandwidth extension output data with the encoded audio signal, wherein the processor is part of the bitstream payload formatter.