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The results from the search for an ‘optimized interaural correlation coefficient’ are presented, along with a short analysis concerning the interaction of loudspeaker directivity and listener envelopment, an aspect which is of major importance for spatial impression and related to listener preference. A look at ‘optimized signal coherence/correlation’ in surround microphone systems is taken, both from the point of view of researchers in the field of sound-engineering, as well as psychoacoustics and concert hall acoustics. Also, a psychoacoustically very relevant aspect such as ‘diffuse sound distribution’-as transmitted through the various stereo microphone techniques-is dealt with. A few keywords: IACC-interaural Cross-Correlation, FSCC-Frequency-dependent Spatial Cross-Correlation and MSC-Magnitude Squared Coherence. After presenting the mathematical definitions of correlation and coherence, we are looking into the practical aspect of signal correlation in stereo microphone systems from a theoretical point of view (e.g. As the low-pass filter cutoff is lowered, the fluctuating pressure magnitude of the coherent structures diminishes while their length increases.First, the fundamentals of signal correlation and signal coherence are outlined. This reveals streaks of instantaneously correlated pressure fluctuations elongated in the streamwise direction and exhibiting spanwise alternation of positive and negative events that meander somewhat in tandem. To address this hypothesis, data have been acquired from a more » dense spanwise array of fluctuating wall pressure sensors, then invoking Taylor's Hypothesis and low-pass filtering the data allows the temporal signals to be converted into a spatial map of the wall pressure field. The spatial coherence required over these long lengths may arise from very-large-scale structures that have been detected in turbulent boundary layers due to groupings of hairpin vortices. Previous wind tunnel experiments up to Mach 3 have provided fluctuating wall-pressure spectra beneath a supersonic turbulent boundary layer, which essentially are flat at low frequency and do not exhibit the theorized in scale, raising questions about their physical origin.
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