NSAM266SAASLASHV datasheet(27/52 Pages) NSC

27 / 52 page

20 Software (Continued)

29 SPEECH SYNTHESIS

Speech synthesis is the technology that is used to create

messages out of predefined words and phrases stored in a

vocabulary

There are two kinds of predefined messages fixed mes-

sages (eg voice menus in a voice-mail system) and pro-

grammable messages (eg time and day stamp or the

You

have n messages announcement in a DAM)

A vocabulary includes a set of predefined words and phras-

es needed to synthesize messages in any language Appli-

cations which support more than one language require a

separate vocabulary for each language

291 International Vocabulary Support (IVS)

IVS is a mechanism by which the CompactSPEECH proces-

sor can use several vocabularies stored on an external stor-

age device IVS enables CompactSPEECH to synthesize

messages with the same meaning but in different lan-

guages from separate vocabularies

Among IVS features

Multiple vocabularies are stored on a single storage de-

vice

Plug-and-play The same microcontroller code is used for

all languages

Synthesized and recorded messages use the same voice

compression algorithm to achieve equal quality

Argumented sentences (For example You have kn l

messages )

Auto-synthesized time-and-day stamp (driven by the

CompactSPEECH’s clock)

Support for various language and sentence structures

One versus many (for example

You have one

message vs You have two messages)

None versus many (for example

You have no mes-

sages vs You have two messages)

Number synthesis (English –

Eighty vs

French –

Quatre-vingt )

Word order (English –

Twenty one vs German –Ein-

undzwanzig )

Days of the week (Monday through Sunday vs

Sunday through Saturday)

292 Vocabulary Design

There are several issues sometimes conflicting which must

be addressed when designing a vocabulary

Vocabulary

If memory space is not an issue the vocabu-

content

lary could contain all the required sentences

each recorded separately

If memory space is a concern the vocabulary

must be compact it should contain the mini-

mum set of words and phrases required to

synthesize all the sentences The least mem-

ory is used when phrases and words that are

common to more than one sentence are re-

corded only once and the IVS tool is used to

synthesize sentences out of them

A good combination of sentence quality and

memory space is achieved if you take the

‘‘compact’’ approach and extend it to solve

pronunciation problems

For example

the

word

twenty is pronounced differently when

used in the sentences

You have twenty mes-

sages and You have twenty two messages

To solve this problem words that are pro-

nounced differently should be recorded more

than once each in the correct pronunciation

Vocabulary

When recording vocabulary words there is a

recording

compromise between space and quality On

one hand the words should be recorded and

saved in a compressed form and you would

like to use the best voice compression for that

purpose On the other hand the higher the

compression rate the worse the voice quality

Another issue to consider is the difference in

voice quality between synthesized and re-

corded messages (eg

between time-and-

day stamp and incoming messages (ICMs) in

a DAM environment) It is more pleasant to

the human ear to hear them both in the same

quality

Vocabulary

Sometimes compactness and high quality are

access

not enough There should be a simple and

flexible interface to access the vocabulary el-

ements Not only the vocabulary but also the

code to access it should be compact

When designing for a multi-lingual environ-

ment there are more issues to consider

Each vocabulary should be able to handle

language-specific structures and designed in

a cooperative way with the other vocabularies

so that the code to access each vocabulary is

the same When you use the command to

synthesize the sentence

Monday 1230 PM

you should not care in what language it is go-

ing to be played back

293 IVS Vocabulary Components

This section describes the basic concept of an IVS vocabu-

lary its components and the relationships between them

The basic

An IVS vocabulary consists of words sen-

concepts

tences and special codes that control the

behavior of the algorithm which Compact-

SPEECH uses to synthesize sentences

The word

The words are the basic units in the vocab-

table

ulary You create synthesized sentences

by combining words in the vocabulary

Each word in the vocabulary is given an

index which identifies it in the word table

Note that

depending on the language

structures and sentences that you wish to

synthesize you may need to record some

words more than once in the vocabulary

For example if you synthesize the sen-

tences

you have twenty messages and

you have twenty five messages the word

twenty is pronounced differently

They

should therefore be defined as two differ-

ent words

The number

The number tables allow you to treat num-

tables

bers differently depending on the context

Example 1 The number 1 can be an-

nounced as

one as in mes-

sage number one or as first as

first message

http

www nationalcom

NSAM266SAA/V 数据表(PDF) 27 Page - National Semiconductor (TI)

NSAM266SAA/V 数据表(HTML) 27 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

数据表下载

链接网址

NSAM266SAA/V 数据表(PDF) 27 Page - National Semiconductor (TI)

NSAM266SAA/V 数据表(HTML) 27 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

数据表 下载

链接网址

数据表下载