S. Ragot

This paper gives an overview of the underlying architecture as well as the novel technologies in the EVS codec and presents listening test results showing the performance of the new codec in terms of compression and speech/audio quality. Expand

This paper describes the scalable coder - G.729 based on three embedded stages: narrowband cascaded CELP coding at 8 and 12 kbit/s, time-domain bandwidth extension (TDBWE) at 14 kbps, and split-band MDCT coding with spherical vector quantization (VQ). Expand

This paper describes a hierarchical speech and audio coding algorithm built on top of a narrowband core codec, which extends the transmitted acoustic bandwidth from the narrowband frequency range (50 Hz-4 kHz) to the widebandfrequency range. Expand

We present a new method, called Voronoi extension, for the design of low-complexity multi-rate lattice vector quantization (VQ). Expand

We present a novel, frequency-domain stereo to mono downmixing technique, which preserves the energy of spectral components and avoids setting the left or right channel as a phase reference. Expand

This paper presents ITU-T Embedded Variable Bit-Rate (EV-VBR) codec being standardized by Question 9 of Study Group 16 (Q9/16) as a scalable solution for compression of 16 kHz sampled speech and audio signals. Expand

A new codec for Enhanced Voice Services (EVS), the successor of the current mobile HD voice codec AMR-WB, was standardized by the 3rd Generation Partnership Project (3GPP) in September 2014. Expand

This article presents ITU-T G.722 appendix IV which is a packet loss concealment (PLC) algorithm recently standardized for G. 722 decoding in the presence of frame erasures. Expand

We present a method for quantizing the wideband line spectrum frequencies with a specific class of near-ellipsoidal lattice codes referred to as “generalized Voronoi codes”. Expand