swiep_BOS_backoff

Safety margin to ensure that the begin-of-speech is captured.

Value

Positive integer

Default

200 (milliseconds)

How to set

Shown in precedence order (see Rules of parameter precedence):

Set in the browser (MRCPv2 only), using the Vendor-Specific-Parameters header in a RECOGNIZE or SET-PARAMS request.

In Management Station set on the Nuance recognition service. If not using Management Station, set in a Recognizer configuration file (User-nrsxx.xml).

Usage

Seldom used.

This parameter specifies the number of milliseconds of prespeech silence to include before sending the utterance to Recognizer. The speech detector uses the margin to extend the begin-of-speech (BOS) marker slightly later (after the computed value) in the audio sample.

Browsers usually set this parameter in a RECOGNIZE request, and the parameter automatically reverts to the previous value after the recognition event. (Alternatively, browsers can use the SET-PARAMS method. See Configuring Recognizer with the browser.)

Vendor-Specific-Parameters: swiep_BOS_backoff=220

Related parameter