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SI4712 Scheda tecnica(PDF) 9 Page - Silicon Laboratories

Il numero della parte SI4712
Spiegazioni elettronici  RECEIVE POWER SCAN PRIMER
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Produttore elettronici  SILABS [Silicon Laboratories]
Homepage  http://www.silabs.com
Logo SILABS - Silicon Laboratories

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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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