AMR Post processing functions


Functions

static float tilt_factor (float *lpc_n, float *lpc_d)
 Get the tilt factor of a formant filter from its transfer function.
static void postfilter (AMRContext *p, float *lpc, float *buf_out)
 Perform adaptive post-filtering to enhance the quality of the speech.

Function Documentation

static void postfilter ( AMRContext p,
float *  lpc,
float *  buf_out 
) [static]

Perform adaptive post-filtering to enhance the quality of the speech.

See section 6.2.1.

Parameters:
p pointer to the AMRContext
lpc interpolated LP coefficients for this subframe
buf_out output of the filter

Definition at line 906 of file amrnbdec.c.

Referenced by amrnb_decode_frame(), ff_sipr_decode_frame_16k(), qcelp_decode_frame(), and synth_frame().

static float tilt_factor ( float *  lpc_n,
float *  lpc_d 
) [static]

Get the tilt factor of a formant filter from its transfer function.

Parameters:
lpc_n LP_FILTER_ORDER coefficients of the numerator
lpc_d LP_FILTER_ORDER coefficients of the denominator

Definition at line 877 of file amrnbdec.c.

Referenced by calc_input_response(), postfilter(), and wiener_denoise().


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