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Remove spectrum window-presum due to lack of code RAM.
This commit is contained in:
Jared Boone
parent
e6351ca066
commit
6cdef7026d
@ -33,273 +33,6 @@ using namespace lpc43xx;
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#include <array>
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/*
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Employ window-presum technique with a window constructed to act like a bin filter.
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See: http://www.embedded.com/design/real-time-and-performance/4007611/DSP-Tricks-Building-a-practical-spectrum-analyzer
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20MHz / 256 bins = 78.125kHz/bin
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Taps made with IPython Notebook "specan_lpf", 26041.666667Hz pass, 53400Hz stop, 1024 taps, Remez, gain of 4 * 128.
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*/
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static constexpr std::array<float, 1024> window_wideband_bin_lpf { {
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0.0000000000f, -0.1215729938f, -0.1213842597f, -0.1201684429f,
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-0.1201208291f, -0.1190024264f, -0.1190858794f, -0.1180910084f,
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-0.1200564042f, -0.1191925052f, -0.1212624937f, -0.1200347844f,
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-0.1227782673f, -0.1205369109f, -0.1247875900f, -0.1173893915f,
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0.3534259170f, 0.3630855246f, 0.3727544495f, 0.3825072994f,
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0.4318755419f, 0.4419066050f, 0.4519266790f, 0.4620411273f,
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0.4721924196f, 0.4824099358f, 0.4925918161f, 0.5029672026f,
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0.5131676220f, 0.5237112702f, 0.5340474666f, 0.5443687487f,
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0.5549596923f, 0.5655037792f, 0.5760846623f, 0.5866412762f,
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0.5972195405f, 0.6078470214f, 0.6185164530f, 0.6292346029f,
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0.6399890869f, 0.6507775481f, 0.6615869909f, 0.6724215836f,
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0.6832601692f, 0.6941326055f, 0.7050115342f, 0.7159351783f,
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0.7268750405f, 0.7378519124f, 0.7488402816f, 0.7598478405f,
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0.7708626189f, 0.7819213638f, 0.7929898181f, 0.8041032024f,
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0.8151863856f, 0.8262675846f, 0.8374347030f, 0.8485124885f,
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0.8596901081f, 0.8708298046f, 0.8818521053f, 0.8932043400f,
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0.9043106868f, 0.9154712945f, 0.9265928796f, 0.9377943260f,
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0.9489884395f, 0.9602246825f, 0.9714051258f, 0.9826151929f,
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0.9937649659f, 1.0049460392f, 1.0160814715f, 1.0272496293f,
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1.0383880993f, 1.0495571434f, 1.0606883842f, 1.0718420204f,
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1.0829385916f, 1.0940532343f, 1.1051116703f, 1.1161955290f,
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1.1272425119f, 1.1382946085f, 1.1492896227f, 1.1602787038f,
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1.1712107201f, 1.1822261399f, 1.1931082102f, 1.2040321660f,
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1.2149338949f, 1.2257216453f, 1.2366886195f, 1.2474232220f,
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1.2581260885f, 1.2689166363f, 1.2796266048f, 1.2903413723f,
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1.3846448962f, 1.3949381321f, 1.4051428918f, 1.4153304829f,
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|
||||
1.8608040839f, 1.8669819454f, 1.8730100097f, 1.8789794347f,
|
||||
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|
||||
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|
||||
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|
||||
1.9473253537f, 1.9518608547f, 1.9562473102f, 1.9605563249f,
|
||||
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|
||||
1.9804869777f, 1.9840965410f, 1.9877044695f, 1.9910612418f,
|
||||
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||||
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|
||||
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|
||||
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||||
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||||
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1.9473253537f, 1.9426980945f, 1.9379346294f, 1.9331147367f,
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|
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0.8596901081f, 0.8485124885f, 0.8374347030f, 0.8262675846f,
|
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|
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|
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|
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|
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|
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|
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|
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||||
0.3922658126f, 0.3825072994f, 0.3727544495f, 0.3630855246f,
|
||||
0.3534259170f, 0.3438662338f, 0.3343234494f, 0.3248945791f,
|
||||
0.3154820195f, 0.3061706020f, 0.2968698668f, 0.2876515447f,
|
||||
0.2784363297f, 0.2692982077f, 0.2601619588f, 0.2511740186f,
|
||||
0.2422305215f, 0.2334738679f, 0.2246834377f, 0.2156750628f,
|
||||
0.2071598962f, 0.1984767185f, 0.1898938500f, 0.1814067004f,
|
||||
0.1729007855f, 0.1645454321f, 0.1562017822f, 0.1479358113f,
|
||||
0.1397136271f, 0.1315923511f, 0.1235258532f, 0.1155633999f,
|
||||
0.1076300783f, 0.0998030288f, 0.0920097856f, 0.0843282945f,
|
||||
0.0766873597f, 0.0691492555f, 0.0616418371f, 0.0542297395f,
|
||||
0.0468355725f, 0.0395537898f, 0.0322938011f, 0.0251689168f,
|
||||
0.0180789645f, 0.0111402133f, 0.0042491810f, -0.0025108764f,
|
||||
-0.0093228281f, -0.0160240942f, -0.0229218816f, -0.0291537434f,
|
||||
-0.0356596108f, -0.0421512920f, -0.0483829023f, -0.0546891309f,
|
||||
-0.0607956180f, -0.0668947833f, -0.0729015436f, -0.0788312843f,
|
||||
-0.0846659246f, -0.0904454283f, -0.0961440884f, -0.1018001799f,
|
||||
-0.1073604731f, -0.1128619755f, -0.1182710743f, -0.1236191798f,
|
||||
-0.1288821834f, -0.1340828639f, -0.1391845207f, -0.1442198838f,
|
||||
-0.1491346512f, -0.1539912234f, -0.1587317239f, -0.1634326051f,
|
||||
-0.1680332327f, -0.1726183100f, -0.1771140890f, -0.1816310071f,
|
||||
-0.1859484086f, -0.1902676621f, -0.1941135048f, -0.1982312400f,
|
||||
-0.2025752799f, -0.2062425510f, -0.2102567274f, -0.2139529315f,
|
||||
-0.2177326536f, -0.2213504338f, -0.2249483716f, -0.2284043787f,
|
||||
-0.2318685842f, -0.2351846242f, -0.2384901545f, -0.2416375134f,
|
||||
-0.2447669078f, -0.2477656128f, -0.2507463340f, -0.2536057399f,
|
||||
-0.2564433319f, -0.2591571117f, -0.2618581518f, -0.2644425265f,
|
||||
-0.2670290887f, -0.2695102609f, -0.2719823809f, -0.2743418063f,
|
||||
-0.2766682382f, -0.2788599641f, -0.2809996598f, -0.2829509809f,
|
||||
-0.2848865889f, -0.2867034021f, -0.2886979015f, -0.2909536921f,
|
||||
-0.2921271926f, -0.2939578995f, -0.2955408715f, -0.2970457316f,
|
||||
-0.2985327732f, -0.2998832522f, -0.3012206975f, -0.3024750370f,
|
||||
-0.3036791840f, -0.3047953307f, -0.3058756301f, -0.3068771119f,
|
||||
-0.3078644089f, -0.3087558210f, -0.3096257208f, -0.3103913733f,
|
||||
-0.3111336729f, -0.3117751598f, -0.3123958369f, -0.3129048624f,
|
||||
-0.3133944699f, -0.3137462882f, -0.3140959719f, -0.3143048413f,
|
||||
-0.3145480407f, -0.3146624743f, -0.3148580017f, -0.3149481827f,
|
||||
-0.3152146050f, -0.3152392795f, -0.3154945639f, -0.3145152697f,
|
||||
-0.3146688330f, -0.3147549076f, -0.3142523940f, -0.3141297440f,
|
||||
-0.3136545108f, -0.3133679403f, -0.3128663068f, -0.3124439347f,
|
||||
-0.3118458639f, -0.3113288653f, -0.3106447420f, -0.3100296179f,
|
||||
-0.3092353383f, -0.3085060392f, -0.3076169401f, -0.3068011429f,
|
||||
-0.3058372184f, -0.3049525345f, -0.3039122280f, -0.3029682798f,
|
||||
-0.3018593574f, -0.3008800902f, -0.2997260603f, -0.2987161065f,
|
||||
-0.2974931002f, -0.2964174081f, -0.2950580040f, -0.2938671020f,
|
||||
-0.2922042842f, -0.2908411467f, -0.2887415908f, -0.2879411883f,
|
||||
-0.2872351631f, -0.2847616987f, -0.2836812630f, -0.2818896819f,
|
||||
-0.2804988036f, -0.2787902978f, -0.2772761254f, -0.2755608442f,
|
||||
-0.2740080396f, -0.2722769142f, -0.2706716369f, -0.2689155628f,
|
||||
-0.2672727018f, -0.2655133466f, -0.2638390865f, -0.2620527778f,
|
||||
-0.2603277216f, -0.2584896769f, -0.2567089643f, -0.2548171418f,
|
||||
-0.2529788379f, -0.2510271295f, -0.2491104380f, -0.2470901019f,
|
||||
-0.2451131271f, -0.2430630996f, -0.2410984360f, -0.2390892017f,
|
||||
-0.2372897729f, -0.2355468158f, -0.2341760732f, -0.2330266272f,
|
||||
-0.2285011851f, -0.2276718013f, -0.2256330226f, -0.2236245172f,
|
||||
-0.2216212397f, -0.2195723764f, -0.2175598198f, -0.2155244502f,
|
||||
-0.2134958020f, -0.2114475228f, -0.2094317510f, -0.2073919547f,
|
||||
-0.2054038199f, -0.2033652690f, -0.2013983100f, -0.1993785604f,
|
||||
-0.1974621775f, -0.1954904285f, -0.1936526632f, -0.1917311189f,
|
||||
-0.1899836720f, -0.1881030278f, -0.1864679413f, -0.1846305866f,
|
||||
-0.1831168886f, -0.1812660021f, -0.1798377067f, -0.1778294249f,
|
||||
-0.1764397529f, -0.1738005522f, -0.1723006308f, -0.1666149935f,
|
||||
-0.1685811576f, -0.1683593655f, -0.1645983125f, -0.1640690747f,
|
||||
-0.1614806858f, -0.1606274956f, -0.1583282171f, -0.1573540028f,
|
||||
-0.1551676484f, -0.1541795914f, -0.1520476681f, -0.1510623954f,
|
||||
-0.1489403301f, -0.1479788256f, -0.1458627832f, -0.1449481895f,
|
||||
-0.1428068116f, -0.1419434716f, -0.1397338876f, -0.1389458751f,
|
||||
-0.1366453783f, -0.1359864220f, -0.1335694857f, -0.1330985791f,
|
||||
-0.1305094750f, -0.1303677621f, -0.1275474455f, -0.1280766855f,
|
||||
-0.1248521391f, -0.1270419996f, -0.1230013683f, -0.1333820215f,
|
||||
-0.1356269751f, -0.1173893915f, -0.1247875900f, -0.1205369109f,
|
||||
-0.1227782673f, -0.1200347844f, -0.1212624937f, -0.1191925052f,
|
||||
-0.1200564042f, -0.1183823726f, -0.1190734477f, -0.1176885372f,
|
||||
-0.1183154633f, -0.1171681501f, -0.1177737061f, -0.1168115435f,
|
||||
-0.1174295604f, -0.1166353753f, -0.1173065305f, -0.1166760717f,
|
||||
-0.1174165122f, -0.1169320615f, -0.1177379144f, -0.1173947314f,
|
||||
-0.1182902140f, -0.1180910084f, -0.1190858794f, -0.1190024264f,
|
||||
-0.1201208291f, -0.1201684429f, -0.1213842597f, -0.1215729938f,
|
||||
} };
|
||||
|
||||
void WidebandSpectrum::execute(buffer_c8_t buffer) {
|
||||
// 2048 complex8_t samples per buffer.
|
||||
// 102.4us per buffer. 20480 instruction cycles per buffer.
|
||||
@ -311,10 +44,10 @@ void WidebandSpectrum::execute(buffer_c8_t buffer) {
|
||||
}
|
||||
|
||||
if( (phase & 7) == 0 ) {
|
||||
const size_t window_offset = (phase >> 3) * 256;
|
||||
const auto window_p = &window_wideband_bin_lpf[window_offset];
|
||||
// TODO: Removed window-presum windowing, due to lack of available code RAM.
|
||||
// TODO: Apply window to improve spectrum bin sidelobes.
|
||||
for(size_t i=0; i<channel_spectrum.size(); i++) {
|
||||
spectrum[i] += std::complex<float> { buffer.p[i].real() * window_p[i], buffer.p[i].imag() * window_p[i] };
|
||||
spectrum[i] += std::complex<float> { buffer.p[i].real(), buffer.p[i].imag() };
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user