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Effect of Target Signal Envelope on Direction Discrimination in Spatially Complex Sound Scenarios

The temporal envelope of a sound signal has been found to have an effect on localization. Whether this is valid for spatially complex scenarios was addressed by conducting a listening experiment in which a spatially distributed sound source consisted of a target between two interfering noise-like sound sources, all emitting sound simultaneously. All the signals were harmonic complex tones with components within 2 kHz–8.2 kHz and were presented using loudspeaker reproduction in an anechoic chamber. The phases of the harmonic tones of the target signal were altered, causing the envelope to change. The results indicated that prominent peaks in the envelope of the target signal aided in the discrimination of its direction inside the widely distributed sound source.

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