[ICOM] Bad TX audio on 775

[Paul]

Wasn't this same technique used by Dolby in his Dolby "B" noise 
reduction? Anybody ever try Dolby noise reduction with ham equipment, 
particularly Icom ham equipment?

Bob Kulow wrote:

>
>> <snip>
>
>
>> Compandering is a completely different ball game. To use 
>> compandering, the 'normal' 300 to 3000 Hz audio frequencies are 
>> 'converted' to different frequencies and then transmitted (over a 
>> narrower bandwidth channel). At the other end, the received signal is 
>> un-compandered and converted back to it's original 300 to 3KHz 
>> communications quality audio. For instance.........
>
>
> This may be a new form of compandering, but the "classic" definition 
> of compandering is compression at the transmitting end followed by 
> complementary expansion at the receiving end to restore the dynamic 
> range that was lost in compression (Compander: COMPressor AND 
> exPANDER).  This was used in many of the Bell System analog carrier 
> systems to improve SNR.
>
> 73
> Bob WA2UEH
>
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