What is Speech Recognition?
                     WHAT IS SPEECH 
RECOGNITION?
INTRODUCTION
Speech recognition, or speech-to-
text, is the ability of a machine or 
program to identify words spoken 
aloud and convert them into 
readable text. 
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SPEECH RECOGNITION
Rudimentary speech recognition 
software has a limited vocabulary 
and may only identify words and 
phrases when spoken clearly. More 
sophisticated software can handle 
natural speech, different accents and 
various languages.
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FUNCTIONS
Speech recognition uses a broad 
array of research in computer 
science, linguistics and computer 
engineering. Many modern devices 
and text-focused programs have 
speech recognition functions in them 
to allow for easier or hands-free use 
of a device
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HOW DOES SPEECH 
RECOGNITION WORK?
Speech recognition systems use 
computer algorithms to process and 
interpret spoken words and convert 
them into text. A software program 
turns the sound a microphone 
records into written language that 
computers and humans can 
understand.
Source: www.techtarget.com
STEPS OF WORKING
1. analyze the audio
2. break it into parts
3. digitize it into a computer-
readable format
4. use an algorithm to match it to 
the most suitable text 
representation
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MODELS USED
1. Acoustic models. These represent the 
relationship between linguistic units of 
speech and audio signals.
2. Language models. Here, sounds are 
matched with word sequences to 
distinguish between words that sound 
similar.
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MOBILE DEVICES
1. Smartphones use voice commands for 
call routing, speech-to-text processing, 
voice dialing and voice search. Users can 
respond to a text without looking at their 
devices. 
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EDUCATION
1. Speech recognition software is used in 
language instruction. The software hears 
the user's speech and offers help with 
pronunciation.
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CUSTOMER SERVICE
1. Automated voice assistants listen to 
customer queries and provides helpful 
resources.
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DISABILITY ASSISTANCE
1. Speech recognition software can 
translate spoken words into text using 
closed captions to enable a person with 
hearing loss to understand what others 
are saying. 
Source: www.techtarget.com