linux/drivers/isdn/mISDN/dsp_biquad.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * SpanDSP - a series of DSP components for telephony
 *
 * biquad.h - General telephony bi-quad section routines (currently this just
 *            handles canonic/type 2 form)
 *
 * Written by Steve Underwood <[email protected]>
 *
 * Copyright (C) 2001 Steve Underwood
 *
 * All rights reserved.
 */

struct biquad2_state { … };

static inline void biquad2_init(struct biquad2_state *bq,
				int32_t gain, int32_t a1, int32_t a2, int32_t b1, int32_t b2)
{ … }

static inline int16_t biquad2(struct biquad2_state *bq, int16_t sample)
{ … }