asterisk users - Nov 2010 - Unit of measurement dahdi_monitor

I am studying about echo cancellation in asterisk and I want to use the
numeric information from dahdi_monitor verbose for my research.
Unfortunately, I couldn't find anything about the unit of measurement used
in this tool. Which unit is used to measure the signal level?
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On Thu, Nov 25, 2010 at 11:54 AM, Gustavo Santos <gustavo at
voip.ufrj.br>wrote:
> I am studying about echo cancellation in asterisk and I want to use the
> numeric information from dahdi_monitor verbose for my research.
> Unfortunately, I couldn't find anything about the unit of measurement
used
> in this tool. Which unit is used to measure the signal level?
>
>
dahdi_monitor uses the sample values in L16 format.

They are in orders of magnitud of G.711. See tables 5 and 6 of the G.711
spec. In the end, the reference value is the dBm (google that).

Moises Silva
Senior Software Engineer
Sangoma Technologies Inc. | 100 Renfrew Drive, Suite 100, Markham ON L3R 9R6
Canada
t. 1 905 474 1990 x128 | e. moy at sangoma.com
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