AD3 file extension - ADPCM 3-bit compressed voice file
What is ad3 file? How to open ad3 files?
File type specification:
The ad3 file extension is used for an ADPCM audio file format.
Adaptive Differential Pulse Code Modulation (ADPCM) codecs are waveform codecs which instead of quantizing the speech signal directly, like PCM codecs, quantize the difference between the speech signal and a prediction that has been made of the speech signal.
The ad3 file stores 3-bit compressed voice.