FIELD: acoustics.
SUBSTANCE: invention relates to means for audio bandwidth extension by noise insertion. Bitstream is received and an encoded audio signal is derived from the bitstream using a bitstream receiver. Decoded audio signal in a time domain is derived from the encoded audio signal using a core decoder module. Temporal envelope of the decoded audio signal is determined using a temporal envelope generator. Frequency domain bandwidth extension signal is generated using a bandwidth extension module, performing the following steps. Generating a noise signal in time domain using a noise generator of the bandwidth extension module. Temporal shaping of the noise signal depending on the temporal envelope of the decoded audio signal using a pre-shaping module. Transforming the shaped noise signal into a frequency domain noise signal, wherein the frequency domain bandwidth extension signal depends on the frequency domain noise signal, using a time-to-frequency converter.
EFFECT: higher efficiency of bandwidth extension.
24 cl, 4 dwg
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