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AN INTRODUCTION TO PRAAT

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Title: AN INTRODUCTION TO PRAAT


1
AN INTRODUCTION TO PRAAT
  • Tina John M.A.
  • Institute of Phonetics and digital Speech
    Processing - University Kiel
  • Institute of Phonetics and Speech Processing -
    University München

2
PRAAT
  • Developer Paul Boersma David Weenink 
  • Where Institute of Phonetic Sciences
    University of Amsterdam
  • Intension Doing Phonetics by Computer   

http//www.praat.org
3
PRAAT - INTENSION
4
CONCEPT
  • uses Object Window, Picture Window, Info Window,
    Editors and Scripts
  • works with
  • objects
  • Sounds, Annotations, Tables, Signal Tiers ...
  • several functions for particular objects
  • edit, draw, analyse ...
  • several functions for object collections
  • concatenate, multiply, ...

5
INPUT
  • base material speech signal files
  • read from file
  • automatically converted to Sound Object

6
SIGNAL PROCESSING
  • carried out internally
  • e.g. signals are
  • derived from input
  • sound within praat
  • derived signals
  • might converted to
  • signal objects and
  • thus be saved to file

7
ANNOTATION - CONCEPT
  • carried out by TextGrid objects
  • created for a sound object
  • at one or more levels
  • intervals (segments)
  • points (targets)

8
ANNOTATION
  • always bound to time
  • several levels are not
  • related to each other

9
ANNOTATION
  • TextGrid objects are written to TextGrid files
  • in ASCI format (simple text)
  • includes type, time marks and labels

10
QUERY
  • for very simple queries only
  • countings, sequences, positions, structures need
    to be queried via self written praat scripts
  • Extracts
  • segment intervals of particular (any) label
  • time marks of particular label

11
Scripting
  • Praat provides a simple scripting language
  • All actions from Windows and Editors are recorded
    and can be pasted from a history to a script
    (text editor).
  • These commands can be edited and extended by new
    commands.
  • It is easy to repeat a set of commands with new
    parameter without using the graphical interface.

12
ANALYSIS
  • appear as functions for particular objects
  • Duration
  • Spectral Analyses
  • Formantfrequency
  • Pitch
  • Intensity
  • complex analyses
  • COG
  • ...
  • many more

13
SYNTHESIS
  • Manipulation
  • Pitch
  • Intensity
  • Pulses
  • Duration
  • Sytheses
  • PSOLA
  • LPC
  • ...

14
OUTPUT
  • data can be written to file for reuse or export
  • Sound files
  • Signal files
  • TextGrid files
  • Text files (matrices)
  • Pictures from Praat Picture
  • made by draw
  • Windows Metafile
  • ESP

15
END OF THEORY
  • Lets start with the praxis
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