Audible Pause is a feature proposal for mobile and SW-based audio players. It is a feature that would keep playing the last “sound” after the Pause button is pressed. Just like the last video frame is displayed when Pause is pressed on the Video player. However, since playing a single audio sample in a loop does not lead to anything audible, this Audio Pause feature needs a little signal processing behind the scenes.
The trick would be to:
1. look for frames of the signal with similar spectral envelope,
2. smooth the envelope a bit in time [1],
3. apply phase-synchronous overlap-add [2] in a loop in order to keep the the automatically chosen audio frames (point 1) play continuously.
Applications:
- Useful feature for note transcription by listening
- Useful for learning sounds of speech in foreign languages (ü, ö, ä, etc)
References:
[1] anything about RASTA filtration
[2] anything on phase vocoders
