Difference between revisions of "SMC/SoC/2008"

The aim is to develop a speech recognition system for Malayalam using the concepts of memory prediction framework. Meory prediction framework put forward by Jeff Hawkins in his book 'On Intelligence'(2004) is a theory of brain function, based on  the hierarchical organization of human neocortex.It explains how this hierarchical structure enables brain to match sensory inputs to the stored memory patterns for predicting the future input sequences. According to this model, neocortex as a layered structure with different layers storing constructs of varying complexity, with sensory inputs coming to the lowest layer. For example in case of vision, the lower layer receives retinal signals and layers up the hierarchy associates themselves with meaningful constructs like lines, two dimensional figures, and furthur up specific objects like faces etc. In speech the layers store different speech constructs from phonemes and syllables to phrases and sentences. The human speech perception and recognition can be understood using  this hierarchical organization and the ability of brain to predict the future inputs.

If we mimic the way in which human brain recognizes speech, the resulting system will be more robust than existing systems. The system is first trained with a carefully compiled database and different speech constructs are stored in different layers.When a speech segment to be recognized is given, a series of predictions start and signals will be passed upwards and downwards the layers, until the most probable speech construct is arrived at. For example if the most probable candidate for first word is 'how', predictions start as to what succeeding words can be. This continues until the last word and the phrase giving maximum most probability will chosen among these predictions.