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29 lines
717 B
C
29 lines
717 B
C
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/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef CROSSOVER_H_
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#define CROSSOVER_H_
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#include "biquad.h"
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/* An LR4 filter is two biquads with the same parameters connected in series:
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*
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* x -- [BIQUAD] -- y -- [BIQUAD] -- z
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*
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* Both biquad filter has the same parameter b[012] and a[12],
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* The variable [xyz][12] keep the history values.
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*/
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struct lr4 {
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struct biquad bq;
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float x1, x2;
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float y1, y2;
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float z1, z2;
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};
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void lr4_set(struct lr4 *lr4, enum biquad_type type, float freq);
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void lr4_process(struct lr4 *lr4, float *data, int samples);
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#endif /* CROSSOVER_H_ */
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