Open Access
Localization of sound sources in binaural reproduction of first and third order ambisonics
(Poznan University of Technology, 2022) Sagasti, Amaia; Pietrzak, Agnieszka Paula; San Martín Murugarren, Ricardo; Eguinoa Cabrito, Rubén; Ciencias; Zientziak
The use of higher-order ambisonics in spatial sound recordings makes it possible to increase the accuracy of recording information about the direction from which the sound comes to the listener. However, with binaural ambisonic sound reproduction, the listener's ability to locate the sound source accurately may be limited. This paper presents a comparison of the listener's ability to locate a sound source during binaural listening to recordings made with first and third order ambisonic microphones. The analysis was carried out for two types of signal: pink noise and ringing sound. The analysis of localization errors depending on the ambisonics order, azimuth and elevation angles as well as the type of signal is presented. The obtained data indicate that in binaural reproduction of the ambisonic sound the localization errors in the azimuth plane were smaller for the third order ambisonics, compared to the first order. In the elevation plane both for first and third order the errors were significant.
Open Access
Visualización de diferencias entre señales envolventes en formato ambisónico
(Sociedad Española de Acústica, 2022) Eguinoa Cabrito, Rubén; Sagasti, Amaia; San Martín Murugarren, Ricardo; Pietrzak, Agnieszka Paula; Arana Burgui, Miguel; Ciencias; Zientziak
Ambisonics es un formato de sonido de esfera completa en el que, en contraste con otros formatos envolventes, los canales no distribuyen la señal que alimenta a cada altavoz. Por ello, cuando se desea cuantificar diferencias entre diferentes codificaciones para evaluar la calidad de diferentes micrófonos ambisónicos, por ejemplo, la comparación directa de los niveles de cada canal no proporciona resultados fácilmente interpretables. En esta comunicación se presenta una aplicación en Matlab que facilita la comparación en tiempo real de señales en formato ambisónico hasta de séptimo orden. Las diferencias en cuanto a distribución espacial de energía sonora se visualizan en una proyección azimutal modificada que preserva las proporciones de las áreas. Para ello, se decodifica cada señal a una malla de altavoces virtuales espaciados uniformemente. Un cálculo posterior de los valores eficaces en cada punto permite representar la distribución de energía de cada señal y evaluar así su imagen espacial. Se muestran, a modo de ejemplo de uso, representaciones de diferentes órdenes de codificación para una misma escena sonora y del efecto sobre señales de primer orden de diferentes técnicas paramétricas de upmixing.
Open Access
Subjective evaluation of the localization performance of the spherical wavelet format compared to ambisonics
(IEEE, 2021) Eguinoa Cabrito, Rubén; San Martín Murugarren, Ricardo; Arteaga, Daniel; Scaini, Davide; Ciencias; Zientziak
A common goal of most spatial audio techniques is to reproduce the precise location and size of sound sources. Ambisonics is a well-established spatial audio technique that renders sound sources with increasing accuracy as the Ambisonics’ order increases. Recently, a novel spatial audio format that replaces spherical harmonics with a set of functions based on wavelets has been proposed. The Spherical Wavelet Format (SWF) aims to improve Ambisonics localization, especially at low orders. This study investigates the perceptual spatial properties of both techniques by means of a set of MUSHRA tests.
Open Access
Localization errors in binaural reproduction of first and third-order ambisonic recordings
(Convention of the European Acoustics Association, 2023-11-03) Pietrzak, A. P.; Sagasti, Amaia; Eguinoa Cabrito, Rubén; San Martín Murugarren, Ricardo; Ciencias; Zientziak; Ingeniería Eléctrica, Electrónica y de Comunicación; Ingeniaritza Elektrikoa, Elektronikoa eta Telekomunikazio Ingeniaritza
It may be expected that high spatial resolution of a sound image obtained in higher order ambisonics should lead to smaller localization errors compared to first order. However, with binaural reproduction of ambisonic sound, the listener's ability to precisely localize the sound source may be reduced by the inaccuracies and spatial distortions made by the binaural decoders. This study compares the localization errors that occur when listening to pink noise bursts recorded with the use of first and third-order ambisonic microphones and presented binaurally through the earphones. It is discussed how in such a case localization errors vary depending on the ambisonics order and the type of the binaural renderer used. Localization errors were measured separately in azimuth and elevation. The median azimuth error was 25° for first-order and 20° for third-order recordings, with the front-back confusions excluded from the analysis. In elevation the median error for first-order was 65° and for third-order it was 100°, but it should be noted that in this plane front-back and up-down confusions were not omitted. Obtained results indicate no statistically significant differences between the four binaural decoders used.

San Martín Murugarren, Ricardo

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