This file controls settings related to the speech server.
It is located by default in /etc/lumenvox/
See Configuration Files for more information about other configuration files.
The following parameters can be set. The format to use within the configuration file is PROPERTY_NAME = VALUE
HMM_TYPE
Description: Which Engine decoder model is used – continuous or semi-continuous. The continuous decoder has seen increased in accuracy across several domains, but may require approximately 15-20% more processing time. In some domains, the semi-continuous decoder proved more accurate. Our recommendation in most cases is to use continuous mode.
Possible Values: SEMI (for semi-continuous) or CONT (for continuous) .
Default Value: SEMI
ENABLE_CACHE
Description: Whether grammar caching should be turned on or off. Grammar caching allows the server to automatically cache all loaded grammars to disk. This can save a lot of time when loading larger grammars, as they must be compiled before use, and this can take a while for big grammars.
Possible Values: 0 (disabled) or 1 (enabled).
Default Value: 1
CACHE_EXPIRATION
Description: The amount of time, in seconds, the Engine will use a cached grammars on disk. If a cached grammar on disk is older than this value, the Engine will disregard the cached copy. If you are making extensive use of caching to preload very large grammars, you may want to set this very high.
Possible Values: An integer. If it is set to 0, the Engine will never used cached grammars.
Default Value: 1440
CACHE_MAX_NUMBER
Description: The maximum number of grammars to be kept in cache. The higher the number of grammars kept in memory, the more memory gets used in storing them.
Possible Values: An integer. If it is set to 0, the Engine will not cache any grammars.
Default Value: 100
CACHE_MAX_MEMORY
Description: The maximum amount of memory, in bytes, that can be used to cache grammars
Possible Values: An integer. If it is set to 0, the Engine will not cache any grammars.
Default Value: 268435456 (256 MB)
SRE_PORTNUM
Description: The port number that the speech server will use to listen for incoming speech requests.
Possible Values: A port number.
Default Value: 5730
NUM_DECODE_THREADS
Description: The maximum number of processing threads for decoding audio. This parameter should NOT be modified at all, unless instructed by LumenVox support.
Possible Values: An integer. If it is set to 0, the Engine will not perform any decodes.
Default Value: 4
LOAD_XXX_RES_MODEL
Description: Determines which of the three resolution levels (LOW, MED, HIGH) of acoustic model are loaded. A higher resolution model requires more memory, and may result in longer decode times, but can also provide increased accuracy. Combinations ( LOW and HIGH) can be enabled, but the lower resolution will be defaulted to.
Possible Values: 0 (disabled) or 1 (enabled)
Default Value: LOW enabled
LOAD_LOW_RES_MODEL = 1
LOAD_MED_RES_MODEL = 0
LOAD_HIGH_RES_MODEL = 0