Martin Gartner

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This paper describes the scalable coder – G.729.1 – which has been recently standardized by ITU-T for wideband telephony and voice over IP (VoIP) applications. G.729.1 can operate at 12 different bit rates from 32 down to 8 kbit/s with wideband quality starting at 14kbit/s. This coder is a bitstream interoperable extension of ITU-T G.729 based on three(More)
—Recommendation G.729.1 is a new ITU-T standard which was approved in May 2006. This recommendation describes a hierarchical speech and audio coding algorithm built on top of a narrowband core codec. One challenge in the codec design is the generation of a wideband signal with a very limited additional bit rate (less than 2 kb/s). In this paper, we describe(More)
— We present an embedded and hierarchical 8–32 kbit/s speech and audio coding algorithm that has been successfully submitted to the ITU-T as a candidate [1] for ITU-T Rec. This contribution gives a comprehensive overview of the proposed codec, describes the implemented algorithms, and states a detailed characterization as well as results of the official(More)
  • Morten Balling, Ernest Gnan, Catherine Lubochinsky, Peter R Haiss, Bernhard Sammer, Martin Gartner +7 others
  • 2010
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Pre-echo is a well-known artefact of transform coding at low bit rates. In this paper we present a new method to address this problem. The input signal is assumed to be coded in two stages: in time domain first, and then in transform domain. This is for instance the case in CELP+transform embedded coding. The first stage reconstructs a signal that is(More)
Title: Solving zero-dimensional systems of equations and inequations, depending on parameters. The MOCAA 2004 workshop is a two day workshop sponsored by the Fields Institute and Mathematics of Information Technology and Complex Systems (MITACS) held in conjunction with East Coast Computer Algebra Day (ECCAD). The workshop will consist of five featured(More)
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