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https://github.com/ekeeke/Genesis-Plus-GX.git
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68 lines
1.4 KiB
C
68 lines
1.4 KiB
C
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//---------------------------------------------------------------------------
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//
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// 3 Band EQ :)
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//
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// EQ.H - Header file for 3 band EQ
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//
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// (c) Neil C / Etanza Systems / 2K6
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//
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// Shouts / Loves / Moans = etanza at lycos dot co dot uk
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//
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// This work is hereby placed in the public domain for all purposes, including
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// use in commercial applications.
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//
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// The author assumes NO RESPONSIBILITY for any problems caused by the use of
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// this software.
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//
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//----------------------------------------------------------------------------
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#ifndef __EQ3BAND__
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#define __EQ3BAND__
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// ------------
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//| Structures |
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// ------------
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typedef struct {
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// Filter #1 (Low band)
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double lf; // Frequency
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double f1p0; // Poles ...
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double f1p1;
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double f1p2;
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double f1p3;
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// Filter #2 (High band)
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double hf; // Frequency
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double f2p0; // Poles ...
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double f2p1;
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double f2p2;
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double f2p3;
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// Sample history buffer
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double sdm1; // Sample data minus 1
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double sdm2; // 2
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double sdm3; // 3
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// Gain Controls
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double lg; // low gain
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double mg; // mid gain
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double hg; // high gain
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} EQSTATE;
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// ---------
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//| Exports |
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// ---------
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extern void init_3band_state(EQSTATE * es, int lowfreq, int highfreq,
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int mixfreq);
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extern double do_3band(EQSTATE * es, int sample);
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#endif // #ifndef __EQ3BAND__
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