Frequency-dependent interaural cross-correlation measures sound-field reconstruction fidelity.

Evidence

Muraoka and Nakazato (2007) used a measurement of frequency-dependent interaural cross-correlation (FIACC) as a measure of the successful “sound-field recomposition”. The idea was simple: FIACC was measured in four large spaces: a large lecture hall and three concert halls. An omnidirectional loudspeaker on the stage was the source. Recordings were made at 203. the measurement locations using a circular array of 12 equally spaced microphones. These recordings were reproduced through different numbers of these channels using loudspeakers placed at 2 m from a measurement mannequin in an anechoic chamber. The FIACC of the sound field reproduced by each of the loudspeaker configurations was measured, and a “square error” metric was computed, describing the degree of difference between the FIACC at the original location, and that reproduced by the test arrangement of loudspeakers. The difference was computed over a “full” bandwidth (100 Hz to 20 kHz) and over a “fundamental” bandwidth (100 Hz to 1 kHz), the frequency range believed to be most related to the perception of envelopment. — Toole, Floyd E, Sound reproduction- the acoustics and…, 734

Categorization

• DEFINE: Defines FIACC as a tool for measuring how well a reproduced sound field matches the original across frequency.
• XREF: Connects to envelopment research and how perceptual models of spatial reproduction are validated both subjectively and objectively.