This makes hearing disability a major worldwide issue. In 2015, 360 million people, including 32 million children, were suffering from hearing impairment all over the world. The results are discussed and compared with the previous literature. Virtual audio over headphones is used to investigate the effects of directional separation of talkers, the quantity and gender of talkers, the degree of masker interaural correlation, masking level, and selective attention. Following the review, several experiments are presented in which the effects of various conflicting signals on speech communications are measured. ![]() The literature on the detection of speech is included to describe factors that can affect speech intelligibility. In this book chapter (Binaural and Spatial Hearing in Real and Virtual Environments, Lawrence Erlbaum Associates, Mahwah NJ, publishers, 1997), the literature on the speech intelligibility of competing messages and the masking of speech is reviewed. Real-world environments often degrade the intelligibility of the desired speech signal. ![]() Frequently, the desired speech signal is confounded with other speech signals and noises. ![]() Speech communication are seldom isolated auditory events in quiet environments.
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