18982181. INTEGRATION OF HIGH FREQUENCY AUDIO RECONSTRUCTION TECHNIQUES (DOLBY INTERNATIONAL AB)
INTEGRATION OF HIGH FREQUENCY AUDIO RECONSTRUCTION TECHNIQUES
Organization Name
Inventor(s)
Kristofer Kjoerling of Solna SE
Heiko Purnhagen of Sundbyberg SE
Per Ekstrand of Saltsjöbaden SE
INTEGRATION OF HIGH FREQUENCY AUDIO RECONSTRUCTION TECHNIQUES
This abstract first appeared for US patent application 18982181 titled 'INTEGRATION OF HIGH FREQUENCY AUDIO RECONSTRUCTION TECHNIQUES
Original Abstract Submitted
A method for decoding an encoded audio bitstream is disclosed. The method includes receiving the encoded audio bitstream and decoding the audio data to generate a decoded lowband audio signal. The method further includes extracting high frequency reconstruction metadata and filtering the decoded lowband audio signal with an analysis filterbank to generate a filtered lowband audio signal. The method also includes extracting a flag indicating whether either spectral translation or harmonic transposition is to be performed on the audio data and regenerating a highband portion of the audio signal using the filtered lowband audio signal and the high frequency reconstruction metadata in accordance with the flag. The high frequency regeneration is performed as a post-processing operation with a delay of 3010 samples per audio channel.