Data Sheet

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User Manual (1.0.17) EasyVR 3 (Plus) 79
Using Custom Data
Sound Table
The EasyVR module can play one of the sounds or sentences saved on its internal flash memory. A
predefined “beep” sound is also always available, even when no sounds have been downloaded to the
module.
The custom sounds are organized in a so-called “sound table” that users can prepare and build with the
special QuickSynthesis
TM
tool. Please refer to this application’s own manual for details about the creation
of a sound table. Let’s summarize the basic steps here:
 Prepare the audio files you want to include in the sound table in WAV format, uncompressed 16-
bit 22050Hz mono. To create the sound files you may use a free software like Audacity for
example (http://audacity.sf.net)
 Open Sensory’s QuickSynthesis
TM
5 and create a new project, specifying “RSC4 family”
 Add your WAV files and specify one of the supported compression scheme (see table below)
 Optionally add sentences, by combining basic WAV sounds. That allows you to save memory when
you have speech audio files, if they share some pieces (like “You said” + “One”, “You said” +
“Two”, and so on)
 Build the project with QuickSynthesis
TM
and use default settings (“Build linkable module”, “Load
in CONST space”, “Load above or at: 0”). You will be asked to recompress new or modified sound
files, just confirm and proceed
 Now save your project and build it once again, so that the EasyVR Commander will see that your
build is up to date.
The audio compression formats supported by the EasyVR module (from highest to lowest compression
rate):
Compression Scheme
Available Time (8kHz 15% silence)
Available Time (9.3kHz 15% silence)
SX-2
20.9 minutes
18.1 minutes
SX-3
18.4 minutes
15.9 minutes
SX-4
16.3 minutes
14.1 minutes
SX-5
14.7 minutes
12.6 minutes
SX-6
13.4 minutes
11.6 minutes
4-bit ADPCM
209 seconds
N/A
8-bit PCM
108 seconds
92 seconds
For audio file containing speech, the SX-3 compression is usually a good choice. If you need higher quality
try lower compression rates. Please note that due to the sampling rate used, the audio files cannot
contain very high frequencies (less than half the sampling rate).