An avionic installation intended to be on board an aircraft, the avionic installation comprising at least one avionic system, a set of sensors and an electronic interface device connected between each avionic system and the set of sensors, the set of sensors comprising a first sensor and two voice recognition engines with a respective grammar for each voice recognition engine, the two grammars being different, wherein the electronic interface device comprises: - a detection module configured to detect a first signal, the first signal being able to be sent by a user or a piece of electronic equipment and received by a first sensor from the set of sensors; - an activation module configured to activate at least the two voice recognition engines from the set of sensors as a function of the first detected signal and predefined determining rules, the two voice recognition engines thus activated then being able to detect a second signal from the user, the first sensor being of a type distinct from that of the two voice recognition engines; - an acquisition module configured to acquire every second signal, received by each voice recognition engine; and - a generating module configured to evaluate the two second signals acquired from the two voice recognition engines, then to select the second acquired signal having the highest confidence level among the confidence levels assigned by the two voice recognition engines, and to generate a message corresponding to the selected second acquired signal and to send said message to one or several corresponding avionic systems. the set of sensors comprising a first sensor and two voice recognition engines with a respective grammar for each voice recognition engine, the two grammars being different, wherein the electronic interface device comprises: - a detection module configured to detect a first signal, the first signal being able to be sent by a user or a piece of electronic equipment and received by a first sensor from the set of sensors; - an activation module configured to activate at least the two voice recognition engines from the set of sensors as a function of the first detected signal and predefined determining rules, the two voice recognition engines thus activated then being able to detect a second signal from the user, the first sensor being of a type distinct from that of the two voice recognition engines; - an acquisition module configured to acquire every second signal, received by each voice recognition engine; and - a generating module configured to evaluate the two second signals acquired from the two voice recognition engines, then to select the second acquired signal having the highest confidence level among the confidence levels assigned by the two voice recognition engines, and to generate a message corresponding to the selected second acquired signal and to send said message to one or several corresponding avionic systems. - a detection module configured to detect a first signal, the first signal being able to be sent by a user or a piece of electronic equipment and received by a first sensor from the set of sensors; - an activation module configured to activate at least the two voice recognition engines from the set of sensors as a function of the first detected signal and predefined determining rules, the two voice recognition engines thus activated then being able to detect a second signal from the user, the first sensor being of a type distinct from that of the two voice recognition engines; - an acquisition module configured to acquire every second signal, received by each voice recognition engine; and - a generating module configured to evaluate the two second signals acquired from the two voice recognition engines, then to select the second acquired signal having the highest confidence level among the confidence levels assigned by the two voice recognition engines, and to generate a message corresponding to the selected second acquired signal and to send said message to one or several corresponding avionic systems.