This document summarizes a seminar presentation on text-to-speech synthesis and voice stick devices. The presentation covers the introduction of speech synthesis and its challenges. It discusses the disadvantages of braille systems and introduces the voice stick device, how it works using optical character recognition to convert text to audio. The presentation discusses the working principles of text-to-speech systems and their architecture. It outlines the advantages of these systems and their applications in devices for the blind, smartphones, vehicles and more. The presentation concludes with a section on further research and development opportunities in this area.

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NAME:NADIMINTI SAROJA KUMAR
ROLL NUMBER:12EEE032
REGISTRATION NUMBER:1201210503
BRANCH:ELECTRICAL & ELECTRONICS
ENGINEERING(EEE)
27TH JULY 2K15 1
TEXT TO VOICE
SYNTHESIS

2. CONTENTS:-
1. Introduction to speech synthesis
2. Disadvantages of braille system
3. Introduction to voice stick device
4. Working principle
5. Advantages
6. Applications
7. Further research & development
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3. INTRODUCTION TO SPEECH
SYNTHESYS:-
• What is speech synthesis?
– Computer technology that 'constructs' human speech
from electronic circuits to replace pre-recorded human
voice.
• What is the task?
–Generating natural sounding speech on the fly, usually
from text.
– It is used to translate written information into aural
information where it is more convenient.
• What are the main difficulties?
– What to say and how to say.
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Disadvadvantages of Braille system:
• Errors cannot be erased.
• It is more costly.
• Non availability of each type of books.
• Not possible to make articles, newspapers etc.
• Cannot be read by a sighted person who has not learned it.

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INTRODUCTION TO VOICE STICK DEVICE:-
➢ It is a text scanning device for the visually impaired
people.
➢ The stick when scanned in the printed letters, the
OCR function recognizes the text and converts the
information into voice.
➢ The voice is then read back
and thus helping the visually
challenged person.
➢ It can read books, e-mails, atms, etc.
with a perfect sound.

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Working principle:-
➢ The speech synthesis is often known as text to speech (TTS)
system.
➢It usually consist of two parts:
▪ First it takes the raw text and converts latters, numbers etc into their
written-out word equivalents. This process is often called text
normalization, pre-processing, or tokenization.
▪ Then it assigns phonetic transcriptions to each word, and divides and
marks the text into various linguistic units like phrases, clauses, and
sentences.
▪ In second it takes the symbolic linguistic representation and converts it
into actual sound output.

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Text-to-phoneme module
Architecture of TTS systems:
Text input
Grapheme-to-
phoneme
conversion
Prosodic
modelling
Acoustic
synthesis
Abbreviation
lexicon
Text in orthographic form
Exceptions
lexicon
Orthographic rules
Phoneme string
Normalization
Grammar rules
Phoneme string +
prosodic annotation
Prosodic model
Synthetic speech
output
Phoneme-to-speech module
Various
methods

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o Easy to operate.
o Provides nearly natural sound.
o More accuracy in medical systems.
o It reduces the human effort in the case of any application.
o It provides talking machines for vocally impaired or deaf
people and better aids for speech therapy.
ADVANTAGES:-

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APPLICATIONS:-
✓Speech synthesis walking device for blind.
✓Automatic reading of computer screen.
✓Voice operating mode in smart phones.
✓Voice controlled vehicle.
✓Railway announcement.
✓Robotics. etc

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RESEARCH & DEVELOPMENT:-

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REFERENCES:-
http://www.microsoft.com/msagent/downloads/user.asp
http://www.bytecool.com/voices.htm
http://www.digitalfuturesoft.com/texttospeechproducts.php
http://www.neospeech.com/product/technologies/tts.php
http://nextup.com/TextAloud/SpeechEngine/voices.html#mo
refreevoices

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