ASA 129th Meeting - Washington, DC - 1995 May 30 .. Jun 06
3aAA4. Technical matters relating to the measurement of interaural
cross-correlation (IACC) coefficients in concert halls and opera houses.
Takayuki Hidaka
Toshiyuki Okano
Takenaka Res. & Dev. Inst., 5, 1-chome, Ohtsuka, Inzai-machi, Inba-gun,
Chiba 270-13, Japan
The interaural cross-correlation coefficient (IACC) has been shown to be
an important measure, along with others, of the quality of acoustics in concert
halls and opera houses [Schroeder et al., 1199 (1974); Ando, Concert
Hall Acoustics (Springer-Verlag, Berlin, 1985)]. When measured in auditoriums
with binaural heads (real or dummy) using an impulse source, means must be
adopted to achieve accuracy and precision, and to select the type of impulse
and processing methods to make IACC most useful in the prediction of acoustical
quality. Subjects covered include: (1) type of impulse, (2) convolution signal,
(3) integration limits, (4) directivity and positions of source in the hall,
(5) parameters of head, (6) comparisons of measurements made with real and
dummy heads, (7) value of torso, (8) measuring positions in hall, (9)
comparison of measurements of IACC in halls with upholstered and nonupholstered
seats, (10) comparison with IACC measurements made by other laboratories, and
(11) some preliminary data on differences among IACCs measured in occupied and
unoccupied halls.