Stationary noise
Definition
Noise whose spectral characteristics remain approximately constant over the duration of a recording. Tape hiss, HVAC fan noise, and mains hum are typical examples. Stationary noise is tractable by spectral subtraction and Wiener filtering.
Related terms
- Non-stationary noise
- Interference whose spectral content changes over time: a vehicle passing, a crowd noise that rises and falls, or a door slamming. Adaptive...
- 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...
- 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 IntelligibilityNoise whose spectral characteristics remain approximately constant over the duration of a recording. Tape hiss, HVAC fan noise, and mains hum are typical examp...