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fht_tables.h
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// Used by the audio spectrum code to remove noise from the input signal
// and amplify remainder to compensate.
#if CONFIG_FHT && defined(MEGATINYCORE)
static uint8_t noise[FHT_N / 2] = {
// These figures came from recording "silence" but might be
// thrown off by ambient noise during recording (computer fans, etc.)
74, 65, 29, 29, 19, 25, 22, 23, 12, 21, 19, 20, 16, 18, 18, 18, 4, 14, 14,
14, 12, 15, 14, 14, 8, 13, 12, 13, 11, 12, 11, 11, 4, 5, 5, 6, 6, 6, 6, 6,
6, 7, 7, 7, 7, 7, 8, 8, 3, 7, 7, 4, 4, 5, 5, 6, 4, 5, 5, 5, 5, 5, 5, 4,
#if (FHT_N == 256)
// These are made-up numbers for now. Will want to re-record the whole
// table if we decide to use FHT_N of 256. That's only an option on
// ATtiny with 1K RAM or better, the smaller ones can't handle it.
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
#endif
// Also probably a function of the mic/amp circuit being used.
// Might want to re-do this with final hardware.
};
// Same deal, these came from recording frequency sweeps at high volume,
// might be limited by mic, etc. and need a re-do w/final hardware.
static uint8_t peak[FHT_N / 2] = {
// Why do you do this to me, clang-format?
180,
188,
189,
188,
179,
185,
178,
187,
187,
185,
186,
189,
185,
188,
188,
180,
186,
187,
188,
188,
188,
188,
188,
187,
187,
187,
186,
177,
185,
186,
185,
183,
182,
181,
182,
171,
162,
170,
180,
180,
178,
164,
175,
172,
161,
153,
150,
159,
159,
163,
159,
155,
151,
152,
152,
153,
164,
174,
178,
171,
176,
178,
178,
171,
#if (FHT_N == 256)
// See notes above
159,
159,
159,
159,
159,
159,
159,
159,
159,
159,
159,
159,
159,
159,
159,
159,
159,
159,
159,
159,
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159,
159,
159,
159,
159,
159,
159,
159,
159,
159,
159,
159,
159,
#endif
};
static uint16_t scale[FHT_N / 2] = {
364,
348,
346,
348,
366,
354,
368,
350,
350,
354,
352,
346,
354,
348,
348,
364,
352,
350,
348,
348,
348,
348,
348,
350,
350,
350,
352,
370,
354,
352,
354,
358,
360,
362,
360,
383,
404,
385,
364,
364,
368,
399,
374,
381,
407,
428,
436,
412,
412,
402,
412,
422,
434,
431,
431,
428,
399,
376,
368,
383,
372,
368,
368,
383,
#if (FHT_N == 256)
// See notes above
412,
412,
412,
412,
412,
412,
412,
412,
412,
412,
412,
412,
412,
412,
412,
412,
412,
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412,
412,
412,
412,
412,
412,
412,
412,
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412,
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#endif
};
#endif // end CONFIG_FHT