Markus Zaunschirm

Kunstuniversität Graz | KUG

Can auralization of a highly directional source in a room succeed if it employs a room impulse response (RIR) measurement or simulation relying on a first-order directional source, only? This contribution presents model and evaluation of a source-and-receiver-directional Ambisonics RIR capture and processing approach (SRD ARIR) based on a small set...

To improve the limited degree of immersion of static binaural rendering for headphones, an increased measurement effort to obtain multiple-orientation binaural room impulse responses (MOBRIRs) is reasonable and enables dynamic variable-orientation rendering. We investigate the perceptual characteristics of dynamic rendering from MOBRIRs and test fo...

In the current effort to improve sound for virtual auditory environments, realism and audio quality in head-tracked binaural rendering is again becoming important. While rendering based on static dummy-head measurements achieve high audio quality and externalization, the realism lacks interactivity with changes of the head orientation. Motion-track...

(Open Access: https://doi.org/10.1121/1.5040489) Binaural rendering of Ambisonic signals is of great interest in the fields of virtual reality, immersive media, and virtual acoustics. Typically, the spatial order of head-related impulse responses (HRIRs) is considerably higher than the order of the Ambisonic signals. The resulting order reduction o...

Both the quality and immersion of binaural auralization benefit from head movements and individual measurements. However, measurements of binaural room impulse responses (BRIRs) for various head rotations are both time consuming and costly. Hence for efficient BRIR synthesis, a separate measurement of the listener-dependent part (head-related impul...

The icosahedral loudspeaker (IKO) as a compact spherical array is capable of 3rd order Ambisonics (TOA) beamforming, and it is used as a musical and technical instrument. To develop and verify beamforming with its 20 loudspeakers flush-mounted into the faces of the regular icosahedron, electroacoustic properties must be measured. We offer a collect...

Our paper deals with important perceptual qualities in a head-tracked rendering system based on: a simulated source- and- receiver-directional room impulse response (SRDRIR), head-related impulse responses (HRIRs), and a source of artificial directivity; all represented in Ambisonics. The aim of this paper is to check on a paramount ingredient of s...

The quote from Pierre Boulez, given as an epigraph to this article, inspired French researchers to start developing technology for spherical loudspeaker arrays in the 1990s. The hope was to retain the naturalness of sound sources. Now, a few decades later, one might be able to show that even more can be done: In electroacoustic music, using the ico...

A fully constructive superposition of direct sound from multiple, distant loudspeakers can be achieved by adjusting the delay of the signal fed to each loudspeaker. This type of superposition is focused to one point in the sound-field where the level is increased compared to elsewhere. In a room, the reflected sound comes in addition to direct soun...

PEAQ (Perceptual evaluation of audio quality) is an international standard for quality prediction of wide-band audio codecs (coder-decoder) according to ITU-R BS.1387, developed by an international consortium of leading audio quality experts in 1999. The commercially available implementation of PEAQ offers two analysis models (basic and advanced) w...

Everyday situations are rich in numerous acoustic events emerging from different origins. Such acoustic scenes may comprise discussions of our fellow human beings, chirping birds, cars, cyclists, and many more. So far, no recording or scene analysis technique for this rich and dynamically changing acoustic environment exists, though it would be nee...

Distributed microphone arrays exploit the spatial diversity of an acoustic scene and obtain higher signal-to-noise ratios than compact microphone arrays that sample the sound field only locally. However, as distances between distributed microphones grow, wired connections become infeasible and Wireless Acoustic Sensor Networks (WASN) need to be emp...

This paper describes how to use a planar circular pressure-zone table-top microphone array for modal beamforming. Its goals are similar as for spherical arrays: higher-order resolution and a more-or-less steering-invariant beampattern design in the three-dimensional half space. As conventional circular arrays lack control of the beampattern in the...

The transient modifier is a type of audio effect that changes the level of the transient parts in a musical signal while leaving the steady-state parts unchanged. This article presents a high-performance algorithm for transient detection and modification, one that is capable of modifying transients in polyphonic or multi-voiced signals, and capable...

The transient modifier is a type of audio effect which at-tempts to change the level of the transient parts in a musical signal while leaving the steady state parts unchanged. This paper presents a high performance transient detection and modification algorithm, capable of modifying transients in polyphonic or multi-voiced signals, and capable of m...