A frequency-dependent Ambisonic sound scene dynamic range compressor (DRC) More...

#include "ambi_drc.h"
#include "ambi_drc_internal.h"

Functions
float	ambi_drc_gainComputer (float xG, float T, float R, float W)
	The DRC gain computer.

float	ambi_drc_smoothPeakDetector (float xL, float yL_z1, float alpha_a, float alpha_r)
	The envelope detector.

void	ambi_drc_initTFT (void *const hAmbi)
	Initialise the filterbank used by ambi_drc.

void	ambi_drc_setInputOrder (SH_ORDERS inOrder, int *nSH)
	Sets the internal input order.

Detailed Description

A frequency-dependent Ambisonic sound scene dynamic range compressor (DRC)

The implementation can also keep track of the frequency-dependent gain factors for the omnidirectional component over time (for optional plotting). The design is based on the algorithm presented in [1].

The DRC gain factors per band are determined based on the omnidirectional component, which are then applied to all of the higher-order components; thus, the spatial information of the Ambisonic sound scene is retained (although, your perception of them may change due to the DRC).

See also: [1] McCormack, L., & Välimäki, V. (2017). "FFT-Based Dynamic Range Compression". in Proceedings of the 14th Sound and Music Computing Conference, July 5-8, Espoo, Finland.

Author: Leo McCormack

Date: 07.01.2017

License: ISC

Definition in file ambi_drc_internal.c.

Function Documentation

◆ ambi_drc_gainComputer()

float ambi_drc_gainComputer	(	float	xG,
		float	T,
		float	R,
		float	W )

The DRC gain computer.

Definition at line 46 of file ambi_drc_internal.c.

◆ ambi_drc_initTFT()

void ambi_drc_initTFT ( void *const hAmbi )

Initialise the filterbank used by ambi_drc.

Definition at line 87 of file ambi_drc_internal.c.

◆ ambi_drc_setInputOrder()

void ambi_drc_setInputOrder	(	SH_ORDERS	inOrder,
		int *	nSH )

Sets the internal input order.

Definition at line 104 of file ambi_drc_internal.c.

◆ ambi_drc_smoothPeakDetector()

float ambi_drc_smoothPeakDetector	(	float	xL,
		float	yL_z1,
		float	alpha_a,
		float	alpha_r )

The envelope detector.