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Chapter 4 – Voice Commands

Multi-Tech Systems, Inc. AT Commands for the MultiModem & SocketModem MT9234 Series (S000434H) 51

+VSD Silence Detection Sensitivity

Description: 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).

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.

Syntax: AT+VSD=<sds>,<sdi>

Values: <sds> A decimal number corresponding to the selected parameter:

0 Use +VSM silence compression setting and algorithm for long-term

silence detection if +VSM is in use

Use default long-term setting silence detection level and algorithm if

+VSM is not in use.

127 Sets less aggressive long-term silence detection independent of

presence or use of silence compression.

128 Sets nominal long-term silence detection independent of presence or

use of silence compression.

129 Sets more aggressive long-term detection independent of presence or

use of silence compression.

<sdi> A decimal number specifying the required period of silence in units of 0.1

seconds, before the modem can report silence detected at the end of a

voice receive either with the Presumed End of Message (QUIT) or

Presumed Hang up (SILENCE) event reports. A value of 0 disables the

modem silence detection. The range is 0.1 to 25.5 seconds for <sdi>=1

to 255.

Result Codes: OK if values are valid.

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.

Reports: +VSD? Displays current or selected values.

+VSD=? Displays a list of the supported values.

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 65 66

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