diff options
Diffstat (limited to 'src/modules/echo-cancel/adrian-aec.c')
| -rw-r--r-- | src/modules/echo-cancel/adrian-aec.c | 16 |
1 files changed, 6 insertions, 10 deletions
diff --git a/src/modules/echo-cancel/adrian-aec.c b/src/modules/echo-cancel/adrian-aec.c index 6793e59d..04b31e91 100644 --- a/src/modules/echo-cancel/adrian-aec.c +++ b/src/modules/echo-cancel/adrian-aec.c @@ -107,8 +107,7 @@ AEC* AEC_init(int RATE, int have_vector) // mapped to 1.0 with a limited linear function. static float AEC_dtd(AEC *a, REAL d, REAL x) { - float stepsize; - float ratio, M; + float ratio, stepsize; // fast near-end and far-end average a->dfast += ALPHAFAST * (fabsf(d) - a->dfast); @@ -129,16 +128,13 @@ static float AEC_dtd(AEC *a, REAL d, REAL x) // ratio of NFRs ratio = (a->dfast * a->xslow) / (a->dslow * a->xfast); - // begrenzte lineare Kennlinie - M = (STEPY2 - STEPY1) / (STEPX2 - STEPX1); - if (ratio < STEPX1) { + // Linear interpolation with clamping at the limits + if (ratio < STEPX1) stepsize = STEPY1; - } else if (ratio > STEPX2) { + else if (ratio > STEPX2) stepsize = STEPY2; - } else { - // Punktrichtungsform einer Geraden - stepsize = M * (ratio - STEPX1) + STEPY1; - } + else + stepsize = STEPY1 + (STEPY2 - STEPY1) * (ratio - STEPX1) / (STEPX2 - STEPX1); return stepsize; } |