Understanding speech recognition

Speech recognition basically means talking to a computer and making it recognize what we are saying in real time. It converts natural spoken language to digital format that can be understood by a computer. We are mainly discussing the conversion of speech-to-text process here. Using the speech recognition system, the robot will record the sentence or word commanded by the user. The text will be passed to another program and the program will decide which action it has to execute. We can take a look at the block diagram of the speech recognition system that explains how it works.

Block diagram of a speech recognition system

The following is a block diagram of a typical speech recognition system. We can see each block and understand how a speech signal is converted to text:

Speech recognition system block diagram

The speech signal is received through a microphone and will be converted to a digital format such as PCM (Pulse Code Modulation) by the sound card inside...