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參數(shù)資料
| 型號： | RC8650L |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | VOICE SYNTHESIZER |
| 中文描述： | 語音合成器 |
| 文件頁數(shù)： | 22/48頁 |
| 文件大小： | 747K |
| 代理商： | RC8650L |
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22
RC8650 VOICE SYNTHESIZER
RC SYSTEMS
TTS COMMANDS
This section describes the software commands that affect the text-to-
speech synthesizer.
Text Mode/Delay (T/nT)
This command places the RC8650 in the Text operating mode. The
optional delay parameter
n
is used to create a variable pause between
words. The shortest, and default delay of 0, is used for normal speech.
For users not accustomed to synthetic speech, the synthesizer’s intel-
ligibility may be improved by introducing a delay. The longest delay
that can be specified is 15. If the delay parameter is omitted, the cur-
rent (last set) value will be used and
the exception dictionary will be
disabled
. This feature is useful for returning from another operating
mode or disabling the exception dictionary (see Enable Exception
Dictionary command).
Character Mode/Delay (C/nC)
This command puts the RC8650 in the Character operating mode.
The optional delay parameter
n
is used to create a variable pause
between characters. Values between 0 (the default) and 15 provide
pauses from shortest to longest, respectively. Values between 16 and
31 provide the same range of pauses, but control characters will not
be spoken. If the delay parameter is omitted, the current value will be
used and
the exception dictionary will be disabled
.
Phoneme Mode (D)
This command disables the text-to-phonetics translator, allowing the
RC8650’s phonemes to be accessed directly. Table 2.1 lists the pho-
nemes that can be produced by the RC8650.
When concatenating two or more phonemes, each phoneme must be
delimited by a space. For example, the word “computer” would be
represented phonetically as
K AX M P YY UW DX ER
Phoneme attribute tokens
The RC8650 supports a number of phoneme attribute tokens that can
be used in addition to the standard commands. These tokens do not
require the command character or any parameters, but can only be
used in Phoneme mode and exception dictionaries.
As indicated in Table 2.2, the / and \ tokens temporarily increase and
decrease the pitch by
m
steps. Besides being temporary, the differ-
ence between using the pitch tokens and the Pitch command is that
the effective pitch range is extended beyond the normal 0-99 range
by approximately ±20 steps, and if the pitch should fall out of range,
it will always saturate, regardless of the Protocol Options Register SAT
setting.
All other phoneme attribute token commands remain in effect until
explicitly changed.
If two or more commands are to be used together, each must be pref-
aced with the command character. This is the only way the RC8650
knows to treat the remaining characters as a command, rather than
text that should be spoken. For example, the following commands
program pitch level 40 and volume level 7 (CTRL+A is the default
command character):
CTRL+A “40P” CTRL+A “7V”
The command character
The default RC8650 command character is CTRL+A (ASCII code 01).
The command character itself can be spoken by the RC8650 by send-
ing it twice in a row:
CTRL+A CTRL+A
. This special command allows
the command character to be spoken without affecting the operation
of the RC8650, and without having to change to another command
character and then back again.
Changing the command character
The command character can be changed to another control character
(ASCII 01-26) by sending the current command character, followed by
the new character. To change the command character to CTRL+D, for
example, issue the command
CTRL+A CTRL+D
. To change it back,
issue the command
CTRL+D CTRL+A
. It’s generally a good idea to
change the command character if the text to be read contains charac-
ters which may otherwise be interpreted as command characters (and
hence commands). The command character can be unconditionally
reset to CTRL+A by sending
CTRL+^
(ASCII 30) to the RC8650.
Command parameters
Command parameters are composed of one to four digit number
strings. The RC8650 supports two types of parameters: absolute and
relative.
Absolute
parameters explicitly specify the parameter’s new
value, such as 9S or 3B.
Relative
parameters specify a
displacement
from a parameter’s current value, not the actual new value itself.
Relative parameters can specify either a positive or negative displace-
ment from a parameter’s current value. For example, the Volume com-
mand +2V increases the volume level by two (V+2
→
V). If the current
volume is 4, the volume will increase to 6 after the command has ex-
ecuted. The command –2V will have a similar effect, except the volume
will be
decreased
by two.
If the value of a parameter falls outside the command’s range, the val-
ue will either wrap around or saturate, depending on the setting of the
SAT bit of the Protocol Options Register. For example, if parameters are
programmed to wrap, the current volume is 7 and the command +4V
is issued, the resultant volume will be (7+4)–10 = 1, since the volume
range is 0-9. If parameters are programmed to saturate, the resultant
volume would be 9 instead.
When writing application programs for the RC8650, it is recommended
that relative parameters be used for temporarily changing voice attri-
butes (such as raising the pitch of a word), using absolute-parameter
commands only once in the program’s initialization routine. This way,
if the base value of an attribute needs to be changed, it only needs to
be changed in the initialization routine.
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