10-04-2012, 01:36 PM
VOICE RECOGNITION SYSTEM (VRS)
VOICE RECOGNITION SYSTEM (VRS).ppt (Size: 1.14 MB / Downloads: 49)
INTRODUCTION
Voice Recognition System’s are those systems which can recognize the voices of the individuals.
How Humans do This?
Articulation produces
sound waves which
the ear conveys to the brain
for processing.
How might computers do this?
Digitization
Acoustic analysis of the speech signal
Linguistic interpretation
Isolated Systems requires a brief pause between the spoken words.
While Continuous Systems doesn’t.
Speaker Dependent Systems recognize speech from only one speaker.
While Speaker-Independent Systems can recognize anyone’s speech.
How to create a Voice Recognition System
Speech Acquisition(Collection).
Speech Analysis.
User Interface Development.
Speech Acquisition
For training purpose the speech is acquired using the microphone, for the analysis.
The sound card of PC converts the Analog Speech input into digital format for further analysis.
Speech Analysis
The First important step in Speech Analysis is to separate each word from the ambient noise.
Further each spoken word is compared with the inbuilt acoustic model or dictionary which is created during the training session.
The above step is done with the help of an efficient speech detection algorithm.
User Interface Development
Final Step is to Develop a User Interface, so that all users can use these system with ease. For Example: Speech Recognition System of Windows 7 looks so compact & is as shown below.
APPLICATIONS
Telephony and Other Domains.
People with Disabilities.
Training Air-Traffic Controller.
High Performance Fighter Air-Craft.
Electronic Medical Records etc…