Overview: Speech recognition begins when a person speaks into an electronic device, such as a microphone. The microphone converts the speech to an analog signal, which is then converted to a digital signal to be stored on a computer. A speech recognizer, a program running on the computer, attempts to decode the meaning of the speech signal. Certain features of a person's speech are needed by the speech recognizer to decode the signal. These features must be numerically measured and stored in a form the recognizer can understand. The process of measuring the features needed by a speech recognizer is called feature extraction. Continue to Section 3.1 for a theoretical overview of the feature extraction process. Contents:
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