isd-t360sb ETC-unknow, isd-t360sb Datasheet - Page 53

• Manufacturer Part Number: isd-t360sb
• Manufacturer: ETC-unknow

2—SOFTWARE
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VOCABULARY DESIGN
There are several issues, sometimes conflicting,
which must be addressed when designing a vo-
cabulary.
Vocabulary Content
If memory space is not an issue, the vocabulary
could contain all the required sentences, each
recorded separately.
If memory space is a concern, the vocabulary
must be compact; it should contain the minimum
set of words and phrases required to synthesize all
the sentences. The least memory is used when
phrases and words that are common to more
than one sentence are recorded 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 “com-
pact” approach, and extend it to solve pronunci-
ation problems. For example, the word twenty is
pronounced differently when used in the sentenc-
es You have twenty messages and You have
twenty-two messages. To solve this problem,
words that are pronounced differently should be
ISD
Auto-synthesized time-and-day stamp (driven
by the VoiceDSP processor’s clock).
Support for various language and sentence
structures:
– One versus many. (For example: You
– None versus many. (For example: You
– Number synthesis (English—Eighty ver-
– Word order (English—Twenty-one ver-
– Days of the week (Monday through
have one message versus You have
two messages.)
have no messages versus You have
two messages.)
sus French—Quatre-vingt).
sus German—Einundzwanzig).
Sunday versus Sunday through
Saturday).
recorded more than once, each in the correct
pronunciation.
Vocabulary Recording
When recording vocabulary words, there is a
compromise between space and quality. The
words should be recorded and saved in a com-
pressed form, and you should use the best voice
compression for that purpose. However, lower
compression rates do affect the voice quality.
Another issue to consider is the difference in voice
quality between synthesized and recorded mes-
sages (e.g., between time-and-day stamp and
ICMs in a DTAD environment). It is more pleasant
to the human ear to hear both messages have
the same sound quality.
Vocabulary Access
Sometimes compactness and high quality are
not enough. There should be a simple and flexible
interface to access the vocabulary elements. Not
just the vocabulary but the code to access the vo-
cabulary should be compact.
When designing for a multi-lingual environment,
there are even more issues to consider. Each vo-
cabulary 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. 12:30
language it is going to be played back.
P
.
M
., you should not care in what
ISD-T360SB
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