Audio bandwidth extension by insertion of temporal pre-shaped noise in frequency domain

An audio decoder device for decoding a bitstream, the audio decoder device comprising:

• a bitstream receiver configured to receive the bitstream and to derive an encoded audio signal from the bitstream;
• a core decoder module configured for deriving a decoded audio signal in time domain from the encoded audio signal;
• a temporal envelope generator configured to determine a temporal envelope of the decoded audio signal;
• a bandwidth extension module configured to produce a frequency domain bandwidth extension signal, wherein the bandwidth extension module comprises a noise generator configured to produce a noise signal in time domain, wherein the bandwidth extension module comprises a pre-shaping module configured for temporal shaping of the noise signal depending on the temporal envelope of the decoded audio signal in order to produce a shaped noise signal and wherein the bandwidth extension module comprises a time-to-frequency converter configured to transform the shaped noise signal into a frequency domain noise signal, wherein the frequency domain bandwidth extension signal depends on the frequency domain noise signal;
• a time-to-frequency converter configured to transform the decoded audio signal into a frequency domain decoded audio signal;
• a combiner configured to combine the frequency domain decoded audio signal and the frequency domain bandwidth extension signal in order to produce a bandwidth extended frequency domain audio signal;
• and
• a frequency-to-time converter configured to transform the bandwidth extended frequency domain audio signal into a bandwidth-extended time domain audio signal.