Abstract
Reproducing stereophonic signal pairs with two loudspeakers on the front left and right of a listener yields acoustical crosstalk resulting from sound diffraction at the head. Stereophonic phantom sound sources are therefore heard only between the two loudspeakers. However, signal pairs can be constructed from the original signals generating extremely lateral phantom sources. A filter for this purpose is constructed using concentrated elements (“90° filter”). The complex frequency response of the 90° filter is determined in a listening experiment with narrow-band noise. Two 90° filters are combined for a two-channel reproduction system. Signals received by a dummy head with a microphone in each ear are fed to the inputs of the 90° filters. This transmission system was tested for its directional fidelity with many test persons. Localization is nearly ideal for the entire horizontal plane including front-back discrimination and is partly correct even for the median plane.
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