Study of the perceptive variations of room effect for different systems of sound recording and replaying

Background For telecommunication services such as teleconferencing or visioconferencing, the true restitution of sound environment, through a complete transmission system, has become a new goal. The aim now encompasses the presentation of the localization of distant speakers as well as other aspects of the distant sound ambiance such as the room effect which contains auditive infoxmations about its size and the positions of the speakers within the room. This extended version of sound transmission fidelity will become a necessity when will be available sophisticated syste:ms for image transmission, now under project, offering high definition, large screen and stereo vision. At present, the applications of what is often called "virtual acousiics" are found primarily in the musical domain. One goal is to allow an auditor tio listen just as if he were in the hall during the performance although he listens through a complete system including performance recording and replaying or transmission. An other application for contemporary music is to achieve sound diffusion of digitally transformed signals of natural sources, previously recorded or synthesized with loudspeakers.