56K V.92 Data, Fax, and Voice Chipset
Table 6-1. Voice Mode Command Descriptions (Continued)
manufac-
+VSM=m turer- specified
Compression Method Selection: This command contains four parameters that specify the voice compression method, voice sampling rate, silence compression sensitivity, and the degree of silence expansion. The DCE can support different capabilities for each compression method.
m= <cml>, <vsr>, <scs>, <sel>
Defaults: m = 140, 8000, 0, 0
<cml> Compression Method: This parameter selects a voice compression method. The DTE can obtain the label and a string constant identifier by using the +VSM? command.
Range: <cml> =
Default: <cml> = 140
<cml> = 0 LIN1:
<cml> = 1 LIN2:
<cml> = 2 AD4:
<cml> = 128 LIN1:
<cml> = 129 LIN2:
<cml> = 132 AD4:
<cml> = 140* CL1:
<cml> = 141 AD3:
<vsr> Sampling Rate: This parameter selects the DCE voice sampling/digitiz- ing rate for the voice signal. The supported sampling rates are dependent on the compression schemes used. Use the +VSM=? command to obtain supported sampling rates.
Range: <vsr> = 4800, 7200, 8000, and 11025 samples/second
Default: <vsr> = 8000*
<vsr> | Comments | |
(samples/second) | ||
| ||
4800 | Default used by previous legacy modems | |
7200 |
| |
8000 | Used by some bulletin boards | |
9600 | Used by many Windows∗ .WAV files | |
11025 |
<scs> Silence Sensitivity: The function of this parameter depends on whether the DTE is transmitting or receiving in voice mode. The DTE can modify the si- lence expansion using the <sel> parameter. When transmitting voice, a
94 | Intel Confidential | Programmer’s Guide |
