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.

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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().