linear scale and logarithmic scale

u-LAW and A-LAW definitions

A-law and u-law are companding schemes used in telephone network to get more dynamics to the 8 bit samples that is available with linear coding.

Typically 12..14 bit samples (linear scale) sampled at 8 kHz sample.

8 bit (logarithmic scale) for transmission over 64 kbit/s data channel.

In the receiving end the data is then converter back to linear scale (12..14 bit) and played back. converted back