diff options
Diffstat (limited to 'apps')
-rw-r--r-- | apps/eq.c | 2 |
1 files changed, 2 insertions, 0 deletions
@@ -147,6 +147,7 @@ void filter_shelf_coefs(unsigned long cutoff, long ad, long an, int32_t *c) | |||
147 | c[2] = -DIV64(a1, a0, 31); | 147 | c[2] = -DIV64(a1, a0, 31); |
148 | } | 148 | } |
149 | 149 | ||
150 | #ifdef HAVE_SW_TONE_CONTROLS | ||
150 | /** | 151 | /** |
151 | * Calculate second order section filter consisting of one low-shelf and one | 152 | * Calculate second order section filter consisting of one low-shelf and one |
152 | * high-shelf section. | 153 | * high-shelf section. |
@@ -198,6 +199,7 @@ void filter_bishelf_coefs(unsigned long cutoff_low, unsigned long cutoff_high, | |||
198 | *c++ = -FRACMUL_SHL(FRACMUL(a0, a3) + FRACMUL(a1, a2), rcp_a0, 5); | 199 | *c++ = -FRACMUL_SHL(FRACMUL(a0, a3) + FRACMUL(a1, a2), rcp_a0, 5); |
199 | *c++ = -FRACMUL_SHL(FRACMUL(a1, a3), rcp_a0, 5); | 200 | *c++ = -FRACMUL_SHL(FRACMUL(a1, a3), rcp_a0, 5); |
200 | } | 201 | } |
202 | #endif | ||
201 | 203 | ||
202 | /* Coef calculation taken from Audio-EQ-Cookbook.txt by Robert Bristow-Johnson. | 204 | /* Coef calculation taken from Audio-EQ-Cookbook.txt by Robert Bristow-Johnson. |
203 | * Slightly faster calculation can be done by deriving forms which use tan() | 205 | * Slightly faster calculation can be done by deriving forms which use tan() |