Gregory Maxwell

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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(More)
—With increasing quality requirements for multime-dia communications, audio codecs must maintain both high quality and low delay. Typically, audio codecs offer either low delay or high quality, but rarely both. We propose a codec that simultaneously addresses both these requirements, with a delay of only 8.7 ms at 44.1 kHz. It uses gain-shape algebraic(More)
We propose an audio codec that addresses the low-delay requirements of some applications such as network music performance. The codec is based on the modified discrete cosine transform (MDCT) with very short frames and uses gain-shape quantization to preserve the spectral envelope. The short frame sizes required for low delay typically hinder the(More)
Survey and sustainability of energy technologies" (2011). Graduate Theses and Dissertations. Paper 11936. Acknowledgements I would first like to thank my parents Donald and Leanne Gifford for all of the support and advice they have provided me with throughout my entire life. I would also like to thank my sister, Elizabeth, for her support. I would like to(More)
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