Re: Power measurement

Started by Keone Medina April 23, 2009
Hi Dhar and to other group members,

the form of the exponential filter is not shown in your post. can you please re-post it again?

and by the way, what should be the gain factor of the rectangular sliding window? I doubt that it is 1.

and lastly, what measurement method must the detector do? is it the RMS method specified in the recommendation?

thanks to you all and have a good day!:)


--- In e..., "Dharmendra Lingaiah" wrote:
> Hello Vinod Prakash,
> I hope you will get some better insight after reading my
> mail..................
> An exponential filter is used to sharpen spectral features; the constant is
> varied to change the filter shape.
> A exponential filter is of the form where is the filter constant and X is
> the array (i.e., data file) whose X range is normalized between 0 and 1.
> As you may note.., In Section, the exponential filter is
> replaced by a rectangular sliding window of the same length.
> The output of the Exponential Filter is then fed to a DETECTOR,( which the
> G.168 Standard specifies as DETECTOR-INDICATOR ).
> I believe the implementation strategy for the DETECTOR should be based on
> the
> THRESHOLD of detection of the SPECTRAL PEAKS obtained from the EXPONENTIAL
> FILTER......;-)
> Dharmendra Lingaiah
> -----Original Message-----
> From: vinprakash366 [mailto:vinod.prakash@...]
> Sent: Friday, February 01, 2002 11:57 AM
> To: e...
> Subject: [echocancel] Power measurement
> Hi all,
> In the G.168(2000) standard, under section, level
> measurement device, i am a little confused abt the detector-indicator
> block. How should this be implemented in order to decect the power in
> dBm0??. Also, is the 1-pole exponential filter mentioned in the block
> a unity gain filter??
> thanks in advance,
> Vinod