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https://github.com/ekeeke/Genesis-Plus-GX.git
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68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
/*---------------------------------------------------------------------------
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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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