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Discussion Groups | Echo Cancellation | Question on power level units...

Technical discussions about echo cancellation and adaptive filtering in general.

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Question on power level units... - gt4605c - Feb 4 14:52:00 2002

Hello! What is dBm0? I came across this unit in G.167, Section 5.2.2.2, "...signal levels between [-30dBm0] and [-10 dBm0] at Rin...," How do we define the reference level or 0 Transmission Level Point (TLP) in the context of G.167? My second question is kinda related to the first. The above referenced Section goes on to say "...acoustic signals with levels -4.7dBPa [+- 10dBPa] at Sin." Now, when we are working with digital signals in MATLAB or C and compute the acoustic echo using a room impulse response sequence, how can we check whether or not the signals are within the specified levels? Is there a way to convert dBPa to dBm0?? (I am totally lost here!) Thank you, -Krishna

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