FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/lag_wind.c @ 282:9ee8ad3d4d30
frtest: rm gsmfr-hand-test and gsmfr-max-out utils
These hack programs were never properly documented and were written
only as part of a debug chase, in pursuit of a bug that ultimately
turned out to be in our then-hacky patch to osmo-bts-sysmo,
before beginning of proper patches in Osmocom. These hack programs
need to be dropped from the present sw package because they depend
on old libgsm, and we are eliminating that dependency.
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 14 Apr 2024 05:44:47 +0000 |
parents | 8d63b167a5d3 |
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rev | line source |
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libgsmefr: import most *.c files from ETSI source
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1 /************************************************************************* |
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2 * |
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3 * FUNCTION: Lag_window() |
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4 * |
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5 * PURPOSE: Lag windowing of autocorrelations. |
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Mychaela Falconia <falcon@freecalypso.org>
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6 * |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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7 * DESCRIPTION: |
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8 * r[i] = r[i]*lag_wind[i], i=1,...,10 |
49dd1ac8e75b
libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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9 * |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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10 * r[i] and lag_wind[i] are in special double precision format. |
49dd1ac8e75b
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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11 * See "oper_32b.c" for the format. |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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12 * |
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parents:
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13 *************************************************************************/ |
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14 |
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15 #include "gsm_efr.h" |
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16 #include "typedef.h" |
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17 #include "namespace.h" |
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18 #include "basic_op.h" |
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19 #include "oper_32b.h" |
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20 #include "no_count.h" |
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21 #include "sig_proc.h" |
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22 |
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23 #include "lag_wind.tab" |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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24 |
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25 void Lag_window ( |
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26 Word16 m, /* (i) : LPC order */ |
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27 Word16 r_h[], /* (i/o) : Autocorrelations (msb) */ |
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28 Word16 r_l[] /* (i/o) : Autocorrelations (lsb) */ |
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parents:
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29 ) |
49dd1ac8e75b
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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30 { |
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31 Word16 i; |
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32 Word32 x; |
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33 |
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34 for (i = 1; i <= m; i++) |
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35 { |
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parents:
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36 x = Mpy_32 (r_h[i], r_l[i], lag_h[i - 1], lag_l[i - 1]); |
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Mychaela Falconia <falcon@freecalypso.org>
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37 L_Extract (x, &r_h[i], &r_l[i]); |
49dd1ac8e75b
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parents:
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38 } |
49dd1ac8e75b
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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39 return; |
49dd1ac8e75b
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Mychaela Falconia <falcon@freecalypso.org>
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40 } |