Research Publications
01
Spatial Sampling of Binaural Room Transfer Functions for Head-Tracked Personal Sound Zones
Author(s): Qiao, Yue; Luo, Jessica; Choueiri, Edgar Y.
Paper Type: JAES Journal Article
Publication Date: 2024-07-09
Permalink: https://aes2.org/publications/elibrary-page/?id=22643
Abstract:
The spatial sampling of binaural room transfer functions that vary with listener movements, as required for rendering personal sound zone (PSZ) with head tracking, was experimentally investigated regarding its dependencies on various factors. Through measurements of the binaural room transfer functions in a practical PSZ system with either translational or rotational movements of one of the two mannequin listeners, the PSZ filters were generated along the measurement grid and then spatially downsampled to different resolutions, at which the isolation performance of the system was numerically simulated. It was found that the spatial sampling resolution generally depends on factors such as the moving listener’s position, frequency band of the rendered audio, and perturbation caused by the other listener. More specifically, the required sampling resolution is inversely proportional to the distance either between two listeners or between the moving listener and the loudspeakers and is proportional to the frequency of the rendered audio. The perturbation caused by the other listener may impair both the isolation performance and filter robustness against movements. Furthermore, two crossover frequencies were found to exist in the system, which divide the frequency band into three sub-bands, each with a distinctive requirement for spatial sampling.
02
The Impact of Height Microphone Layer Position on Perceived Realism of Organ Recording Reproduction
Author(s): Luo, Jessica; Treanor, Garrett
Paper Type: AES Convention Paper
Publication Date: 2024-09-27
Permalink: https://aes2.org/publications/elibrary-page/?id=22692
Abstract:
For on-site immersive recordings, height microphones are often placed carefully to avoid a distorted or unrealistic image, with many established immersive microphone arrays placing the height microphones 1.5 m or less above the horizontal layer. However, with an instrument so acoustically symbiotic with its space as the pipe organ, the impact of non-coincident height microphone placement has not previously been explored in-depth. Despite this, the pipe organs radiation characteristics may benefit from non-coincident height microphone placement, providing subjectively improved tone color without sacrificing perceived realism. Subjective listening tests were conducted comparing a pipe organ recording with coincident and non-coincident height microphone positions. The findings of this case study conclude that non-coincident height microphone placement does not significantly impact perceived realism of the immersive organ recording.
03
Exploring Immersive Recording and Reproduction Methods for Pipe Organs
Author(s): Treanor, Garrett; Luo, Jessica; Tsuaye, Jeremy; Songmuang, Parichat; Wu, Yi; Jaimes, Angel; Bobby, Joel; Li, Zhinuo
Paper Type: AES Convention Express Paper
Publication Date: 2024-09-27
Permalink: https://aes2.org/publications/elibrary-page/?id=22728
Abstract:
The pipe organ is often underrepresented in classical music recordings, particularly in immersive audio formats. This paper explores a novel approach to recording and reproducing the organ for immersive formats using a modified Bowles Array. Key considerations for immersive recording and reproduction are examined, including the balance between aestheticism and realism, the role of the LFE channel, and the acoustic characteristics of the recording and reproduction environments, as well as the instrument itself. The findings aim to enhance the immersive audio experience of pipe organ music and provide valuable insights for developing standards in immersive recording and reproduction methods for pipe organ performances.