AES Budapest 2012
Paper Session P1
P1 - Applications in Audio
Thursday, April 26, 09:30 — 11:00 (Room: Lehar)
P1-1 Efficient Binaural Audio Rendering Using Independent Early and Diffuse Paths—Fritz Menzer, MN Signal Processing - Schwerzenbach, Switzerland
A multi-source binaural audio rendering structure is proposed that efficiently implements plausible binaural reverberation including early reflections and late reverberation. The structure contains delay lines and a feedback delay network that operate independently, modeling early reflections and diffuse reverberation, respectively. Computationally efficient heuristics are presented for the implementation of an HRTF set and for the diffuse reverberation A real-time implementation on a mobile device is presented.
Convention Paper 8584 (Purchase now)
P1-2 The Hand Clap as an Impulse Source for Measuring Room Acoustics—Prem Seetharaman, Stephen P. Tarzia, Northwestern University - Evanston, IL, USA
We test the suitability of hand clap recordings for measuring several acoustic features of musical performance and recording rooms. Our goal is to make acoustic measurement possible for amateur musicians and hobbyists through the use of a smartphone or web app. Hand claps are an attractive acoustic stimulus because they can be produced easily and without special equipment. Hand claps lack the high energy and consistency of other impulse sources, such as pistol shots, but we introduce some signal processing steps that mitigate these problems to produce reliable acoustical measurements. Our signal processing tool chain is fully-automated, which allows both amateurs and technicians to perform measurements in just a few seconds. Using our technique, measuring a room's reverberation times and frequency response is as easy as starting a smartphone app and clapping several times.
Convention Paper 8585 (Purchase now)
P1-3 Subjective Sound Quality Evaluation of a Codec for Digital Wireless Transmission—Matthias Frank, Alois Sontacchi, University of Music and Performing Arts Graz - Graz, Austria; Thomas Lindenbauer, Martin Opitz, AKG Acoustics GmbH - Vienna, Austria
This paper presents a subjective evaluation of a proprietary sub-band ADPCM (Adaptive Differential Pulse Code Modulation) codec for digital wireless transmission. The evaluation is carried out with 40 expert listeners and is divided into several experimental stages. First, the audibility threshold for codec artifacts is determined for each frequency sub-band, separately. In the next stage, different configurations are ranked on a scale of subjective sound quality ratings, with the resolutions varied across all bands. Finally, selected configurations corresponding to different quality ratings are compared to signals of analog wireless transmission in a multidimensional test. This test reveals the characteristic artifacts for each transmission method. Overall, digital transmission can achieve a better sound quality than analog transmission.
Convention Paper 8586 (Purchase now)
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