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| 型號： | NSAM265SRA |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | CompactSPEECH Digital Speech Processors |
| 中文描述： | CompactSPEECH數(shù)字語音處理器 |
| 文件頁數(shù)： | 9/58頁 |
| 文件大?。?/td> | 712K |
| 代理商： | NSAM265SRA |
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1.0 Theory of Operation
(Continued)
Other Detectors
Detection of busy and dial tones, and no-energy is con-
trolled by tunable parameters. You should tune the thresh-
olds of these parameters to fit your hardware. For more
information see the TUNE command in Section 3.2.
Dial and busy tone detectors work with a band pass filter
that limits the frequency range in which tones can be detect-
ed to 0 Hz–1100 Hz. Its frequency response is illustrated in
Figure 1-1 and the busy tone cadences in Figure 1-2.
Tone Generation
The CompactSPEECH can generate DTMF tones and sin-
gle-frequency tones from 300 Hz to 2000 Hz in increments
of 100 Hz. CompactSPEECH tone generation conforms with
EIA-470-RS standard. Note however, that you may have to
change the value of some tunable parameters in order to
meet the standard specifications since the energy level of
generated tones depends on the analogue circuits being
used.
#
Tune the DTMFDTWISTDLEVEL parameter to control
the twist level of the generated DTMF tones.
#
Use the VC command and tune the TONEDGENERA-
TIONDLEVEL parameter to control the energy level at
which these tones are generated.
#
Use the GT command to specify the DTMF tones and the
frequency at which single tones are generated.
1.9 SPEECH SYNTHESIS
Speech synthesis enables you to announce prerecorded
voice prompts, or form a sentence by combining individual
words. A built-in is supplied with the CompactSPEECH for
announcing the number of messages and the time and day.
The main speech synthesis features are:
#
On-chip English vocabulary for announcing the number
of messages and the time and day.
#
Additional
vocabularies
(NSAM265SF only).
#
International Vocabulary Support (IVS) without changing
the microcontroller code.
#
Up to 220 words in each vocabulary. Each word can be
announced separately.
on
ROM,
or
FLASH
#
Sentences announced from a predefined table of sen-
tences.
#
On-the-fly sentence announcement.
1.9.1 Explanation of Terms
The following terms are used throughout this document:
Vocabulary
A complete set of words and sen-
tences.Words are arranged in aword
table. Sentences are arranged in a
sentence table.
Word Table
A set of words, arranged in a table,
as part of a vocabulary.
Sentence Table
A set of sentences, arranged in a ta-
ble, as part of a vocabulary. The
structure of a sentence table is de-
scribed in detail in the International
Vocabulary Support User’s Manual.
The Internal Vocabulary includes a
built-in table with two entries.
Word
An entry in a word table which repre-
sents a spoken word or phrase. A
word is played with the SW (Say
Words), or SO (Say One word) com-
mands.
Sentence
A series ofwords, synthesized from a
vocabulary. A sentence is defined as
an entry in thesentence table, and is
synthesized with the SS (Say Sen-
tence) or SAS (Say Argumented Sen-
tence) command, or is synthesized
‘‘on-the-fly’’ with the SW command.
Internal Vocabulary
The vocabulary, in English, which re-
sides on the CompactSPEECH’s in-
ternal ROM.
External Vocabulary
An optionalvocabulary which resides
on external ROM or (NSAM265SF
only) FLASH.
International
A method that enables the same
CompactSPEECH command to syn-
thesize sentences
meaning, but in different languages,
from separate external vocabularies.
Vocabulary
with the same
Support (IVS)
TL/EE/12378–3
FIGURE 1-1. Busy and Dial Tone Band Pass Filter Frequency Response
TL/EE/12378–47
[
E
1
b
E
3
]
k
90 ms
FIGURE 1-2. Busy Tone DetectorDCadence Specification
[
S
1
b
S
3
]
k
90 ms
100
k
E
i
k
1700 ms
50
k
S
i
k
1300 ms
9
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