Struct VadConfig 

pub struct VadConfig {
    pub sample_rate: u32,
    pub frame_duration_ms: u32,
    pub start_threshold_db: f64,
    pub stop_threshold_db: f64,
    pub min_speech_frames: u32,
    pub hangover_frames: u32,
    pub speech_zcr_range: (f64, f64),
    pub initial_noise_floor_db: f64,
    pub pre_speech_frames: usize,
}

VAD configuration parameters.

Fields

sample_rate: u32

Sample rate in Hz.

frame_duration_ms: u32

Frame duration in milliseconds (typically 10–30ms).

start_threshold_db: f64

Energy threshold (dBFS) above noise floor to trigger speech start.

stop_threshold_db: f64

Energy threshold (dBFS) above noise floor to end speech.

min_speech_frames: u32

Minimum speech duration in frames before confirming speech.

hangover_frames: u32

Hangover duration in frames — keeps “speaking” state after energy drops.

speech_zcr_range: (f64, f64)

ZCR range for speech confirmation (low, high).

initial_noise_floor_db: f64

Initial noise floor estimate (dBFS).

pre_speech_frames: usize

Number of pre-speech frames to buffer.

Implementations

impl VadConfig

pub fn frame_size(&self) -> usize

Number of samples per frame.

pub fn noisy_street() -> Self

Tuned for noisy environments behind a denoiser (the L2 voice::Denoiser, feature denoise) — do not use on a raw noisy stream, where the energy floor latches regardless of threshold.

Found by a latency-aware parameter sweep over labeled street-traffic, pink, and white scenes (clean → 0 dB SNR): with the signal denoised, the threshold can be raised to 21 dB (rejecting horn and engine residue) while the onset confirmation drops to a single frame (~150–310 ms measured onset). On the same benchmark the shipped defaults behind the denoiser score 174–312 ms onset with more residual open time; on street traffic at 0 dB this preset reads 0 false activations / 3 of 3 utterances / 0 % stuck-open, and it held 0 false client activations in a live Gemini session streaming 0 dB traffic. See the hardening chapter for the full study.

Trait Implementations

impl Clone for VadConfig

fn clone(&self) -> VadConfig

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for VadConfig

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for VadConfig

fn default() -> Self

Returns the “default value” for a type.