Chapter 4 – Voice Commands

Command:

+VSD=<sds>,<sdi>

Set Silence Detection Sensitivity

Values:

0–256 (in 0.1 second intervals)

 

Result Codes:

OK if modem accepts the command; ERROR if one or more of the following apply: 1) the

 

<sds> or <sdi> parameter entered is out of range, or 2) either of the two parameters is

 

missing from the command string. If an error occurs, modem retains the previous <sds>

 

and <sdi> parameter values.

 

Description:

The +VSD= command sets the silence detection sensitivity and the required period of

 

silence before the modem reports silence detected at the end of a voice receive, either

 

with the Presumed End of Message (Quiet) or Presumed Hang Up (Silence) event

 

reports. The table below outlines the possible combinations of the +VSD and +VSM

 

commands using the <sds> parameter. An <sdi> parameter value of 0 means that long-

 

term silence detection is disabled. (Note that long-term silence detection refers to the

 

use of this function to detect the end of a voice receive (i.e., the user stops talking).

 

 

 

 

 

+VS<sds>

+VSM Silence Compression in Use

+VSM Silence Compression Not Used

 

0

Use +VSM silence compression

Use default long-term setting silence

 

 

setting and algorithm for long-term

detection level and algorithm,

 

 

silence detection.

 

 

not 0

Sets long-term silence detection setting

independent of presence or use of

 

 

silence detection, where:

 

 

 

<sds> = 128;

nominal level of silence detection sensitivity

 

 

<sds> > 128;

more aggressive level of silence detection sensitivity (less

 

 

 

sensitive, higher noise levels considered to be silence).

 

 

<sds> < 128;

less aggressive level of silence detection sensitivity (more

 

 

 

sensitive, lower noise levels considered to be silence).

The parameter <sds> is used by the PC to select greater amounts of modem silence detection activity; larger values imply that the PC wants the modem to treat noisier conditions as silence. The value entered for <sds> has no actual unit of measure. The modem may limit silence detection sensitivity to a more narrow range (e.g., from 120 to 136). A setting of 0 has no meaning.

The parameter <sdi> sets the required period of silence before the modem can report silence detected either with the Presumed End of Message (Quiet) or Presumed Hang Up (Silence) event reports. A value of 0 disables modem silence detection, in which case the modem will not report the Presumed End of Message (Quiet) or Presumed Hang Up (Silence) event reports.

Multi-Tech Systems, Inc. SocketModem MT5634SMIxx Reference Guide (S000263C)

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Multi-Tech Systems MT5634SMI V.34, MT5634SMI V.92 manual Command +VSD=sds,sdi Set Silence Detection Sensitivity, 113
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MT5634SMI V.34, MT5634SMI V.92 specifications

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