**3.1 Deep learning in automatic speech recognition**

The automatic speech recognition is the convincing application of deep learning. Speech recognition means making speech as in input to a machine that can make the input process very easy and has a hundred of other advantages as well, that is, illiterate people can also use technology, speech coding, text to speech synthesis, speech recognition, speaker recognition, speech enhancement, speech segmentation, language identification, and many more [11]. The speech is the natural form of communication, hence it is considered a very convincing application.
