SpeechSynthesizer.VisemeReached Event

Raised when a viseme is reached.

Namespace:  System.Speech.Synthesis
Assembly:  System.Speech (in System.Speech.dll)

public event EventHandler<VisemeReachedEventArgs> VisemeReached

A viseme is the basic position of the mouth and face when pronouncing a phoneme. Visemes are visual representations of phonemes.

System.Speech supports 21 visemes for US English, each of which corresponds to one or more phonemes. VisemeReached events are raised when a new phoneme reached has a different corresponding viseme than the previous phoneme reached. Since some visemes represent more than one phoneme, a VisemeReached event is not generated if the next phoneme reached corresponds to the same viseme as the previous phoneme. For example, for the spoken words “this zone”, a PhonemeReached event is raised for the “s” in “this” and the “z” in “zone”. However, a VisemeReached event is not raised for the “z” in “zone” because it corresponds to the same viseme as the “s” in “this”.

The following is a list of the 21 SAPI phonemes and phoneme groups that correspond to a viseme in US English.

Viseme

Phoneme(s)

0

silence

1

ae, ax, ah

2

aa

3

ao

4

ey, eh, uh

5

er

6

y, iy, ih, ix

7

w, uw

8

ow

9

aw

10

oy

11

ay

12

h

13

r

14

l

15

s, z

16

sh, ch, jh, zh

17

th, dh

18

f, v

19

d, t, n

20

k, g, ng

21

p, b, m

For information about data associated with the VisemeReached event, see VisemeReachedEventArgs.

.NET Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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