In the technical installation of a concert, the mixing desk has a key function. As it gathers the signals coming from the stage and brings them back to the loudspeakers, it acts as an intermediairy between sound capture and broadcasting, between the artists and the audience. It must therefore offer to its operator simple and comprehensible ergonomics, so that he can take on the whole range of artistical and technical responsabilities that falls to him. However, we notice that with a constant raise of mixing capacities into stable-sized objects, the interface of digital mixers, widespread in the professional concerts domain, causes many problems to the audio engineers. The goal of this study is therefore to design a new model of interface that can improve the work of audio engineers. In this objective, we have used a User-Centered Design process. As a first stage, we analyzed the working context and the tasks of live audio engineers using specific human-computer interaction methods to understand what were their needs and the constraints in which they work. Then, we tested existing digital mixers to check their characteritics regarding to these constraints and to find a sector that has to be improved. The practical part of this master's thesis concludes it by proposing an interface prototype that can improve mixers ergonomics and thus the ease of work of audio engineers.
Keywords: User-Centered Design / Digital Mixer / Ergonomics / Human-Computer Interaction / Design.