VTAS (HOTAS and DVI)
Key to the level of integration and automation seen in the cockpit is the combination of Direct Voice Input (DVI, also known as Direct Voice Control, or DVC) and Hands On Throttle And Stick (HOTAS). Both of these systems are combined to give what is now known as VTAS or Voice, Throttle And Stick.
Direct Voice Input - DVI
DVI, Direct Voice Input is one of the key cockpit systems in the Typhoon. The module, provided by Smiths Industries of the UK forms part of the aircraft's integrated, CAMU supplied by CDC also of Britain. The first module was delivered by Smiths to CDC in May ready for integration into the first CAMU subsystem now under construction. DVI will be available in the first IPA series due in August 2001.
The speech recognition module allows for connected word voice recognition. Since the system needs to cope with a noisy in-flight environment as well as high-g stresses (effecting the pilots voice and speech) a robust system was required. To this end the unit incorporates various speech recognition algorithms including Markov pattern matching and newer neural-net techniques. The resulting system has a vocabulary of some 200 words, a response time of around 200ms and a recognition capability in excess of 95%. Each aircraft will have to be trained to recognise the voice of its pilot. This task will be achieved via a Ground Support Station (GSS) with the data transferred to the Eurofighter's on-board systems via a Smiths supplied Mission Data Loader.
DVI allows for voice control of some 26 non-critical systems such as radar mode switching, display switching, navigation tasking, etc. Combined with HOTAS the DVI system will remove the need for a pilot to look down at the displays in the majority of situations. In turn this should reduce pilot workload increasing platform effectiveness.
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