The ACT is a file type that is associated with the ‘ADPCM Compressed files’ that are recorded by some MP3 players or voice recorders. ADPCM, short for Adaptive Differential Pulse Code Modulation, is a waveform codec that quantizes the difference between a speech signal and a prediction of a speech signal, instead of quantizing the […] Learn more about act
The AMR file type is primarily associated with ‘Adaptive Multi-Rate ACELP Codec’. Speech encoding format used in GSM telephony. The AMR ACELP coder will lower the compression rate as cellular interference increases, thus enabling more error correction to be applied. It also is used to harmonize the codec standards amongst different cellular systems. (ACELP = […] Learn more about amr