Audio Research

We are a small team of people within the Chair of Multimedia Telecommunications and Microelectronics devoted to audio research. We develop new techniques for audio signal analysis, transformation, synthesis, restoration, watermarking, reconstruction of missing data, and synchronization of data streams. However, our main interests and expertise are in audio signal compression.

The list of our currently pursued research topics include:

• perceptual audio coding,
• bandwidth enhancement of compressed audio,
• sinusoidal modeling of speech and audio, and its applications,
• parametric coding for high quality audio,
• AM-FM modeling of wideband audio,
• multichannel and spatial audio representations,
• new synthesis techniques for musical sounds.

We work in a variety of software and hardware development environments, including Matlab, PureData, MS Visual Studio, TI Code Composer Studio, Xilinx ISE, Active HDL, MPLab. Apart from the workstation and computation facilities, we have a dedicated critical listening room which is acoustically adapted and equipped with with high quality audio reproduction system for conducting rigorous subjective listening tests.

Our recent publications:

• Tomasz Żernicki, Maciej Bartkowiak
  "Audio bandwidth extension by frequency scaling of sinusoidal components, 125th Convention of the Audio Engineering Society, AES Preprint 7622, 2-5 October 2008, San Francisco, USA
  [ Abstract ] ][ Full paper ]
  
  
• Maciej Bartkowiak, Tomasz Żernicki
  "Harmonic Sinusoidal+Noise Modeling of Audio Based on Multiple F0 Estimation, 125th Convention of the Audio Engineering Society, AES Preprint 7510, 2-5 October 2008, San Francisco, USA
  [ Abstract ] [ Full paper ]
  
  
• Tomasz Żernicki, Marek Domański
  "Improved coding of tonal components in MPEG-4 AAC with SBR"
  16th European Signal Processing Conference, August 25-29, 2008, Lausanne, Switzerland
  [ Abstract ] [ Full paper ]
  
  
• Maciej Bartkowiak
  "Application of the Fan-Chirp transform to hybrid sinusoidal+noise modeling of polyphonic audio"
  16th European Signal Processing Conference, August 25-29, 2008, Lausanne, Switzerland
  [ Abstract ] [ Full paper ]
  
  
• Maciej Bartkowiak
  "A unifying approach to transform and sinusoidal coding of audio"
  124th Convention of the Audio Engineering Society, AES Preprint 7454, 17-20 May 2008, Amsterdam, The Netherlands
  [ Abstract ] [ Full paper ]
  
  
• Maciej Bartkowiak, Tomasz Żernicki
  "Hybrydowy, parametryczno-transformatowy kodek dĄwięku"
  Krajowa Konferencja Radiokomunikacji, Radiofonii i Telewizji KKRRiT 2008, 9-11 kwietnia 2008, Wroclaw, POLAND
  [ Abstract ] [ Full paper ]
  
  
• Tomasz Żernicki, Maciej Bartkowiak
  "Zastosowanie modelowania sinusoidalnego do regeneracji wysokoczęstotliwościowych składowych tonalnych kodera MPEG-4 HE-AAC"
  Krajowa Konferencja Radiokomunikacji, Radiofonii i Telewizji KKRRiT 2008, 9-11 kwietnia 2008, Wroclaw, POLAND
  [ Abstract ] [ Full paper ]
  
  
• Maciej Bartkowiak, Tomasz Żernicki
  "Improved partial tracking technique for sinusoidal modeling of speech and audio"
  Poznan University of Technology Academic Journals: Electrical Engineering, No. 54/2007.
  [ Abstract ] [ Full paper ]
  
  
• Maciej Bartkowiak
  "Low bit rate coding of sparse audio spectra using frequency shift and interleaved MDCT"
  15th European Signal Processing Conference EUSIPCO 2007, Poznań, September 3-7 2007
  [ Abstract ] [ Full paper ]
  
  
• Maciej Bartkowiak
  "A Complex Envelope Sinusoidal Model for Audio Coding"
  10th International conference on Digital Audio Effects DAFx 07, Bordeaux, Francja, September 10-15 2007, pp. 285-290
  [ Abstract ] [ Full paper ]
  
  
• Maciej Bartkowiak
  "Stereo and multichannel audio coding with room response compensation for improved coding transparency"
  European Signal Processing Conference, EUSIPCO2006, Florence, Italy, 4-8 September 2006.
  [ Abstract ] [ Full paper ]
  
  
• Maciej Bartkowiak, Tomasz Zernicki
  "A Simple Adaptive Matrixing Scheme for Efficient Coding of Stereo Sound"
  European Signal Processing Conference, EUSIPCO2006, Florence, Italy, 4-8 September 2006.
  [ Abstract ] [ Full paper ]