Science and Development Network (SciDev.Net)
In this paper, the authors analyzes the irrational acoustics of common reference sound source known as pink noise and proposes hi-pass pink noise by removing unnecessary pitch range. Compared to the original pink noise, 20Hz of hi-pass pink noise had a minimum of 20% unnecessary energy reduction and a marginal benefit of 0.7dBFS amplitude, while 40Hz of hig-pass pink noise had a 30% reduction and 1.6dBFS marginal benefit. Despite such physical features, hi-pass pink noise did not show audible difference, hence can replace pink noise regarding acoustic measurements and related research. Not only the frequency characteristics but also the variations in energy make the pink noise suitable for reference sound source.