+
+void ff_acelp_apply_order_2_transfer_function(float *out, const float *in,
+ const float zero_coeffs[2],
+ const float pole_coeffs[2],
+ float gain, float mem[2], int n)
+{
+ int i;
+ float tmp;
+
+ for (i = 0; i < n; i++) {
+ tmp = gain * in[i] - pole_coeffs[0] * mem[0] - pole_coeffs[1] * mem[1];
+ out[i] = tmp + zero_coeffs[0] * mem[0] + zero_coeffs[1] * mem[1];
+
+ mem[1] = mem[0];
+ mem[0] = tmp;
+ }
+}
+
+void ff_tilt_compensation(float *mem, float tilt, float *samples, int size)
+{
+ float new_tilt_mem = samples[size - 1];
+ int i;
+
+ for (i = size - 1; i > 0; i--)
+ samples[i] -= tilt * samples[i - 1];
+
+ samples[0] -= tilt * *mem;
+ *mem = new_tilt_mem;
+}