In contrast to natural sounds, in the case of stereophonic reproduction the ears localize the loudspeakers as the source of the sound. The spatial depth of a recording cannot therefore be reproduced adequately with conventional microphone balancing techniques. This paper describes how to simulate spatial depth artificially. Listening tests demonstrated that stereophonic reflections clearly improve the quality of a sound image, making it more natural. It was shown that the favorable imaging characteristics found for an appropriate main microphone can be transferred consistently to the spot-microphone signals with the aid of modern computer technology.
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https://aes2.org/publications/elibrary-page/?id=5808
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