noise gate keeps the values that move through the subsystem: threshold, attack_ns, release_ns, hysteresis. Some members are pointers into caller- or subsystem-owned memory, so lifetime follows the API that populated them rather than the struct copy itself. More...

#include <include/ascii-chat/audio/mixer.h>

Data Fields
float	cutoff_hz
	Cutoff frequency in Hz (frequencies below this are attenuated).
float	sample_rate
	Sample rate in Hz (set during initialization).
float	alpha
	Filter coefficient alpha (calculated from cutoff_hz).
float	prev_input
	Previous input sample (filter state).
float	prev_output
	Previous output sample (filter state).

Detailed Description

noise gate keeps the values that move through the subsystem: threshold, attack_ns, release_ns, hysteresis. Some members are pointers into caller- or subsystem-owned memory, so lifetime follows the API that populated them rather than the struct copy itself.

High-pass filter settings and state

Implements first-order IIR high-pass filter to remove low-frequency noise, rumble, and DC offset. Useful for cleaning up microphone input.

FILTER BEHAVIOR:

Attenuates frequencies below cutoff_hz
Passes frequencies above cutoff_hz with minimal phase shift
First-order design provides gentle rolloff (-6dB/octave)

Note: Filter state (prev_input, prev_output) must be preserved between samples for proper operation.

Definition at line 222 of file mixer.h.

The documentation for this struct was generated from the following file:

mixer.h

Data Fields

Detailed Description