Non-stationary noise
Definition
Interference whose spectral content changes over time: a vehicle passing, a crowd noise that rises and falls, or a door slamming. Adaptive filtering is required because a fixed noise estimate based on a single silent interval will not model the interference throughout the recording.
Related terms
- PESQ / STOI
- Perceptual Evaluation of Speech Quality and Short-Time Objective Intelligibility: instrumental measures that predict listener intelligibility without needing human subjects. STOI scores between...
- Spectral subtraction
- An enhancement method that estimates the noise spectrum during a speech-free interval and subtracts it from every subsequent frame. Simple and effective...
- Stationary noise
- Noise whose spectral characteristics remain approximately constant over the duration of a recording. Tape hiss, HVAC fan noise, and mains hum are...
- SWGDE
- Scientific Working Group for Digital Evidence: a US-based body that publishes best-practice guidelines for forensic audio, video, and image examination. Its audio...
- Wiener filter
- A minimum mean-squared-error filter that computes a frequency-dependent gain function from the signal-to-noise ratio in each frequency band. Less aggressive than spectral...
Explained in
- Audio Enhancement and Speech IntelligibilityInterference whose spectral content changes over time: a vehicle passing, a crowd noise that rises and falls, or a door slamming. Adaptive filtering is require...