> I know CD quality is 2 channel (stereo) 44,1Khz sampling 
> rate resulting in
> frequency range of "0"...22,05 kHz, resolution 16 
> bit/channel.
> But what are all these other "definitions" like "telephone 
> quality", "FM
> quality", "AM quality"?

Good old days telephone bandwidth was (memory dims)(Gargoyle 
knows) 300 Hz ish - 3200 Hz. Say about 3 kHz audio 
bandwidth. This was in due course digitally sent as 64 kbps 
bit stream, 8 kwords/s x 8 bits. Signal was companded at one 
of two international standard laws giving mayhaps 10 
effective bits.

AM radio channels were 10 kHz space giving +/- 5 kHz 
bandwidth less whatever you need for filter cutoff to fit it 
in that spacing. Gargoyle knows.

FM? Wazzat?



        Russell 

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