Noise Killer is another Android noise cancelling app. It’s designed to filter out noises in public spaces such as train stations, airports, or crowded streets. When you activate the app, it will instantly begin noise cancelling. One nice feature it offers is that it works even when your screen is turned off. This can help you save batteries.
Noise Killer can also automatically adjust the volume based on background noise. When used in this mode, it doesn’t just cancel background noise; it straight-up blocks them out. Better yet, it will lower the volume automatically when background noise decreases, saving battery life.