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Opus 1.6 Released
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Opus Interactive Audio Codec ☛ Opus 1.6 Released
Opus 1.6 introduces an experimental wideband-to-fullband speech enhancer that was presented at WASPAA 2025. It is an addition to the family of Opus speech coding enhancement algorithms which are covered by the related IETF draft. The new Bandwidth Extension (BWE) model is based on a neural network that was trained to generate high frequency speech content (8-20 kHz) from wideband speech (0-8 kHz) without any side information. It can therefore be used to enhance speech from any previous Opus version and there is no risk of breaking compatibility as the model gets improved in the future. Generating highband content from wideband speech is possible since all phonetic information is already contained in the lower frequency range. This is unlike the problem of narrowband (telephone) to wideband extension, which is hard to achieve and tends to be unreliable (which is why we are not attempting it here).
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Linuxiac ☛ Opus 1.6 Audio Codec Released With 96 kHz Audio and ML Improvements
A major update is a new wideband-to-fullband bandwidth extension module. This machine learning component helps rebuild higher-frequency sounds, making audio clearer when the source or network quality is limited. It builds on the ML work from the last release and aims for a more natural, consistent sound.