AES Dublin 2019
Paper Session P14
P14 - DSP: Part 2
Friday, March 22, 11:00 — 13:00 (Meeting Room 2)
Thomas Schmitz, University of Liege - Liege, Belgium
P14-1 Prediction of Least Significant Bits from Upper Bits in Linearly Quantized Audio Waveform—Akira Nishimura, Tokyo University Information Sciences - Chiba-shi, Japan
Bit-depth expansion of digital audio is essential for enhancing the quality of digital contents in re-mastering and up-conversion processes. The current study predicts the least significant bits for the bit-depth expansion from upper bits in linearly quantized samples of a framed audio waveform. A simulated annealing technique is applied to minimize the effective power of the residual signal derived from linear prediction of the framed waveform by localizing positions of the least significant bit (LSB) to be added in the frame. The results of computer simulation using various genres of 100 mono and 10-s music signals exhibit that the mean correct rate of the predicted LSB is 72% using 8-bit quantized waveforms. Measurements of the objective sound quality degradation reveal that the mean objective difference grade (ODG) of the 8-bit signals improved from –2.96 to –2.56 after addition of the predicted LSB.
Convention Paper 10179 (Purchase now)
P14-2 B-Format Decoding Based on Adaptive Beamforming—Alexis Favrot, Illusonic GmbH - Uster, Switzerland; Christof Faller, Illusonic GmbH - Uster, Zürich, Switzerland; EPFL - Lausanne, Switzerland
B-Format signals can be decoded into signals with first order directivity. For stereo and multichannel decoding it would be desirable to have more channel separation than what is achievable by first order. DirAC (directional audio coding) and HARPEX (high resolution plane wave expansion) achieve higher channel separation by means of using a parametric B-Format model to estimate plane waves and diffuse sound, and adaptively rendering those. A limitation is that plane wave and diffuse models are too simple to represent complex B-Format signals. We propose a B-Format decoder, where each channel is generated by an independent adaptive B-Format beamformer. Each beam is generated independently of the other beams, circumventing the limitation when using a single B-Format signal model.
Convention Paper 10180 (Purchase now)
P14-3 Optimizing Wide-Area Sound Reproduction Using a Single Subwoofer with Dynamic Signal Decorrelation—Adam J. Hill, University of Derby - Derby, Derbyshire, UK; Jonathan Moore, University of Derby - Derby, UK
A central goal in small room sound reproduction is achieving consistent sound energy distribution across a wide listening area. This is especially difficult at low-frequencies where room-modes result in highly position-dependent listening experiences. While numerous techniques for multiple-degree-of-freedom systems exist and have proven to be highly effective, this work focuses on achieving position-independent low-frequency listening experiences with a single subwoofer. The negative effects due to room-modes and comb-filtering are mitigated by applying a time-varying decorrelation method known as dynamic diffuse signal processing. Results indicate that spatial variance in magnitude response can be significantly reduced, although there is a sharp trade-off between the algorithm’s effectiveness and the resulting perceptual coloration of the audio signal.
Convention Paper 10181 (Purchase now)
P14-4 Poster Introductions 8—N/A
The purpose of Poster Introductions at the end of certain paper sessions is to give the poster authors a chance to briefly outline what is in their paper and encourage people to come to their poster session and ask questions. • Investigation of an Encoder-Decoder LSTM Model on the Enhancement of Speech Intelligibility in Noise for Hearing Impaired Listeners—Iordanis Thoidis; Lazaros Vrysis; Konstantinos Pastiadis; Konstantinos Markou; George Papanikolaou • Noise Exposure of PC Video Games Players—Gino Iannace; Giuseppe Ciaburro; Amelia Trematerra • Key Benefits and Drawbacks of Surrounding Sound when Wearing Headphones or Hearing Protection—Oscar Kårekull; Magnus Johansson • The Assessment of Maximum and Peak Sound Levels of F3 Category Fireworks—Kamil Piotrowski; Adam Szwajcowski; Bartlomeij Kukulski