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參數(shù)資料
| 型號： | RC86L50-3 |
| 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)： | 29/48頁 |
| 文件大?。?/td> | 747K |
| 代理商： | RC86L50-3 |
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RC8650 VOICE SYNTHESIZER
RC SYSTEMS
AUDIO PLAYBACK COMMANDS
Prerecorded Audio Playback Mode (n&)
A virtually unlimited number of prerecorded sound effects and mes-
sages can be stored in the RC8650, limited only by the amount of
available on-chip audio memory.
RCStudio
, a Windows-based appli-
cation available from RC Systems, makes it easy to create, manage,
and download sound libraries composed of standard Windows wave
files to the RC8650. Sound libraries created with
RCStudio
can also
be downloaded to the RC8650 by simply transmitting the library file
in its entirety.
Each sound file (message or sound effect) in a sound library is
automatically assigned a record number, beginning with zero. The
first file is record 0, the second is record 1, and so on. The playback
command plays records in any random order, using
n
to specify the
desired record.
The playback level can be adjusted with the Volume (
n
V) command.
A volume setting of 5 will cause the files to be played back at their
original volume level.
Text and/or commands may be freely intermixed with the playback
command. For example,
^A “11*” “Hello” ^A “–3V” ^A “3&” ^A “+3V” ^A “9&”
plays the Touch-Tone “#” key and says “hello” at the current volume
setting, followed by the fourth sound file at a reduced volume level,
and finally the tenth sound file at the original volume level.
Real Time Audio Playback Mode (n#/n%)
This mode allows audio samples to be written directly to the RC8650’s
digital-to-analog converter (DAC) via the RC8650’s serial and parallel
ports. All data sent to the RC8650 is routed directly to the RC8650’s
internal audio buffer; the RC8650 then outputs samples from the buffer
to the DAC at the rate programmed by
n
. Because the audio data is
buffered within the RC8650, the output sampling rate is independent
of the data rate into the RC8650, as long as the input rate is equal to
or greater than the programmed sampling rate.
The RC8650 supports PCM and ADPCM audio data formats. RC Sys-
tems’
RCStudio
software can convert standard Windows wave files to
PCM and ADPCM formats for use with the RC8650. ADPCM compres-
sion yields data files that are half the size of PCM files, thereby reduc-
ing the required data bandwidth and storage requirements.
The output sampling rate can be programmed to any rate between 4
and 11 kHz (32,000-88,000 bps) by choosing the appropriate param-
eter value. The relationship between the command parameter
n
and
the sampling rate f
s
is
n = 155 – 617/f
s
f
s
= 617/(155 – n)
where f
s
is measured in kHz. For example, to program an 8 kHz sam-
pling rate, choose
n
=78. The range of
n
is 0–99, hence f
s
can range
from 4 to 11 kHz.
The following procedure should be used for sending PCM or ADPCM
audio data to the RC8650 in real time:
1) Program the desired volume level with the Volume (
n
V) command.
A volume setting of 5 will cause the data to be played back at its
original volume level. This step is optional.
2) Issue the Real Time Audio Playback Mode command
n
# if PCM
data is being sent, or
n%
for ADPCM data. The RC8650 expects
the audio data to immediately follow the command; therefore, be
sure not to terminate the command with a CR or NUL. The TS pin
and TS flag will be asserted at this time.
3) If the RC8650’s serial port is being used for transferring the audio
data, change the host system’s baud rate to 115,200 baud at this
time.
4) Begin transferring the audio data to the RC8650. The same meth-
ods employed for sending any other type of data to the RC8650
should be used. Note that the DAC will not begin taking samples
from the audio buffer until at least 100 bytes have been sent or the
value 80h is sent, whichever occurs first.
5) After the last byte of audio data has been sent to the RC8650, send
the value 80h (–128). This signals the RC8650 to terminate Real
Time Audio Playback mode and return to the text-to-speech mode
of operation. Note that up to 2048 bytes of data may still be in the
audio buffer, so the RC8650 may continue producing sound for as
long as 0.5 second (at 4 kHz sampling rate) after the last byte of
data has been sent. The TS pin/TS flag will not be cleared until all
of the audio data has been output to the DAC, at which time the
RC8650 will again be able to accept data from the host.
If the host’s serial port baud rate was changed in step 3, it should
now be changed back to its original rate.
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