1. Voice Morphing / Speech
Transformation
28 April 2011

2. What is voice morphing?
 Voice
morphing means transition of one
speech signal into another one.
 Technology developed at the Los Alamos
National Laboratory in New Mexico, USA
by George Papcun .
28 April 2011

3. What it perform?
 It
is a technique to modify a source
speaker's speech to sound as if it
was spoken by a target speaker.
 Voice morphing enables speech
patterns to be cloned.
28 April 2011

4. Need of voice morphing…
 Text
 In
To Speech (TTS).
public speech systems.
 For
special effects( just like video or
image morphing is done ).
28 April 2011

5. Steps in voice morphing process..
 Preprocessing.
 Cepstral
Analysis.
 Warping and Interpolation.
 Signal Re-estimation
28 April 2011

6. Preprocessing….
 Pre-Processing
Involves processes
like signal acquisition in discrete form
and windowing
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7. Preprocessing block diagram….
28 April 2011

8. Pitch And Envelope Analysis…
 This
process will extract the pitch.
 Formant information in the speech
signal.
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9. Matching and Warping..
 DTW(Dynamic
Time Warping)
It is used to find the best match
between the pitch of the two
sounds.
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10. Signal Re-Estimation..
 Due
to signals being transformation
into the cepstral domain a magnitude
function is used. This results in a
loss of phase information in the
representation of the data
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11. Limitations..
 Lots
of normalizing problems.
 Some applications require extensive
sound libraries.
 Different languages require different
phonetics.
 It is very seldom complete.
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12. Advantages…
 Allows
speech model to be
duplicated and an exact copy of a
person voice.
 Used in a entertainment field.
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13. Disadvantages…
 Use
to pull out the useful
information.
 It hides the actual identity of the
user.
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14. Application Areas..
 Fake
telephone conversations as
evidence in courts of law.
 Powerful battlefield weapon.
Provide fake orders to the enemy's troops
appearing to come From their own commanders.
28 April 2011

15. Future Scope..
 Extending
the functionality of tool.
Create a powerful and flexible morphing
tool.
 Increased
user interaction.
Graphical User Interface could be
designed and Integrated to make the
package more user-friendly
28 April 2011

16. It is all about on the topic voice
morphing…
THANK YOU!!!!!!
28 April 2011
BY:ASHISH MISHRA
I.T. 3’RD YEAR
0836313008

17. QUESTION?
28 April 2011