Speech is a natural mode of communication for people. We learn all the relevant skills during early childhood, without instruction, and we continue to rely on speech communication throughout our lives. It comes so naturally to us that we don’t realize how complex a phenomenon speech is. Speech recognition is basically making a computer understand spoken language. By understand we mean react appropriately or convert the input speech into another medium. Speech recognition is more and more useful now a days. Various interactive software’s are available in market today but they are useful for general-purpose computers. With the growth in the needs for embedded computing and the demand for embedding platforms, it is required that speech recognition systems are available on them too.
Introduction
Speech recognition basically means talking to a computer, having it recognise what we are saying, and lastly doing it in real time. This process fundamentally functions as a pipeline that converts PCM (Pulse Code Modulation) digital audio from a sound card into recognised speech. Speech recognition is basically making a computer understand spoken language. By understand we mean react appropriately or convert the input speech into another medium. We humans have natural speech recognition. Articulation produces sound waves, which the ear conveys to the brain for processing. The basic question is how might a computer do it? It does it in three ways-Digitization, acoustic analysis of speech signal and linguistic interpretation.
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