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The Significance of Interchannel Correlation, Phase and Amplitude Differences on Multichannel Microphone Techniques
There is a measurable interference between correlated signals produced by multiple loudspeakers in a standard five-channel loudspeaker configuration, resulting in an audible comb filter effect. This is due to small individual differences in distances between the ears of the listener and the various loudspeakers. Although this effect is caused by the dimensions and characteristics of the monitoring environment, it can be minimized in the recording process, particularly through the relative placement of microphones and choice of their directional characteristics. In order to analyse this effect, the correlation of microphone signals and their amplitude differences in a recording environment are evaluated using theoretical models. This procedure is applied to coincident and spaced pairs of transducers for direct and reverberant sounds.
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