High-Quality, Low-Delay Music Coding in the Opus Codec
This addresses the need for efficient audio compression in real-time applications like streaming, though it appears incremental as it builds on existing codec components.
The paper tackles the problem of achieving high-quality, low-delay music coding for real-time Internet applications by describing the transform coder in the Opus codec, which outperforms existing non-real-time audio codecs.
The IETF recently standardized the Opus codec as RFC6716. Opus targets a wide range of real-time Internet applications by combining a linear prediction coder with a transform coder. We describe the transform coder, with particular attention to the psychoacoustic knowledge built into the format. The result out-performs existing audio codecs that do not operate under real-time constraints.