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SI4712 Scheda tecnica(PDF) 9 Page - Silicon Laboratories |
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SI4712 Scheda tecnica(HTML) 9 Page - Silicon Laboratories |
9 / 14 page AN307 Rev. 0.2 9 APPENDIX A: TCL IMPLEMENTATION OF RPS TCL code that demonstrates scanning the entire US FM band is show below. Refer to Section 3 of this document for more information. #This example will find the minimum power for a FM channel. #it will calculate the average power based on a weighted average spanning +/-N channels. # # Variables used to configure the operation of the scan # # These variables define the FM band characteristics # # startFreq - The lower end of the FM band (in 10kHz steps) # endFreq - The upper end of the FM band (in 10kHz steps) # spacing - channel spacing: 50kHz, 100kHz, 200kHz (in 10kHz steps) # # numBands - Breaks the FM band into a number of smaller bands. The min power is found # in each of these frequency bands. # # filterWidth - sets the width of the FIR filter in channels # filter - an array of filterWidth elements which is used to compute the average # coeff - an array of filter coefficients for weighing the value of each channel # in the average. The coefficients are listed in the following order # [N+max, N-max, N-max+1,.....]. For a 5-tap filter the ordering is # [N+2, N-2, N-1, N, N+1] # filterWeight- The scaling factor used to normalize the summed coefficient terms # This term is optional and is only required to normalize results between a single # RNL measurement and the averaged RNL measurements. # # Calculating the filter in place with the proper weighting is done as follows: # # filterPtr is the location where the next sample is placed in the FIR array and is calculated by # taking the current loop number modulo the filterWidth. The channel whose average power is being # calculated is located at a frequency filterMid steps lower than the current frequency. To ensure # that the measured RNL is averaged with the proper coefficients consider the following case: # # freq array A B C D E # # ^ ^ # fltPtr chan N # # N+2 N-2 N-1 N N+1 # coeff 1 1 2 6 2 # # filterPtr always points to N+2 so when weighting the filter values with the coefficients, we can # pull the N+2 coefficient from the coefficient array location 0, and start pulling measurements # from the filter at the filterPtr location. By incrementing filter pointer and taking the modulo we # ensure that we always pull the filter elements in the order that the coefficents are stored in the # coeff array. # set startFreq 8750 set endFreq 10790 |
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