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Literature Review On Speech Recognition

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ABSTRACT This paper provides a literature review of Speech Recognition, its background, methodologies and techniques used. Speech to Text or ASR involves processing the sound waves, extracting basic linguistic units or phonemes [1], then creating contextually correct and meaningful words to form a complete sentence. This paper explains types of speech, different approaches for speech recognition, techniques, the extraction of characteristics and the mathematical representationof ASR. Keywords Speech Recognition, modules/phases of ASR, HMM, feature extraction, MEL, LPC, Large Vocabulary Continuous Speech Recognition-LVCSR, Pattern Classification techniques, Applications, tools INTRODUCTION The most common and primary communication method …show more content…

It effects the complexity, processing requirements and accuracy of the recognition. There are no defined standards for size, the general perception is; small vocabulary - tens of words medium vocabulary - hundreds of words large vocabulary - thousands of words very-large vocabulary - tens of thousands of words. Types of Speech Recognition Systems It can be categorized as follows; ISOLATED WORDS: In this type of recognition, each word is surrounded by pause or break. It accepts single words or single utterance [3] at a time. These systems have "Listen/Not-Listen" states, where they require the speaker to wait between utterances (usually doing processing during the pauses) [2]. CONNECTED WORDS: It’s similar to isolated words, but allow separate utterances to run together with minimal gaps between them. CONTINUOUS SPEECH: Words run into each other and have to be segmented. [4] SPONTANEOUS SPEECH: It recognizes the natural speech. Such system is able to handle features of natural language as spontaneous speech may include mispronunciation, false starts and slang

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