AN307 Datasheet, PDF (4/14 Pages) Silicon Laboratories – RECEIVE POWER SCAN PRIMER

AN307
//If half of the filter has been filled with noise level values,
//calculate the average noise level
SET AverageFreq to ( StartingFreq +
( i - ( FilterWidth / 2 ) ) * ChannelSpacing )
SET NewAverage to 0
SET FilterWeighting to 12
//Multiply the noise levels by with filter weight coefficients
FOR each j = 0 to FilterWidth
SET Index to ( ( j + FilterPointer ) MODULUS FilterWidth )
SET NewAverage to ( NewAverage +
( FilterData at Index ) * ( FilterCoefficients at j ) )
IF ( FilterData at Index ) = 0
SET FilterWeighting to
( FilterWeighting - ( FilterCoefficients at j ) )
SET NewAverage to ( NewAverage / FilterWeighting )
IF NewAverage < ( Minima at CurrentBand )
SET ( Minima at CurrentBand ) to NewAverage
//Record the lowest noise level in the current band
4
Rev. 0.2