Posted by Roderick Stewart on 09/24/07 20:00

In article <TdqdneyV4vffnWXbnZ2dneKdnZygnZ2d@pipex.net>, Brian Gregory [UK]
wrote:
> I'm not an really an expert either.
>
> Actually, come to think of it, thinking of QAM as a combination of AM and 
> PSK isn't at all helpful.
>
> I think QAM should be thought of as two carriers in quadrature with each 
> other each being AM modulated, that is multiplied by numbers (which can be 
> both positive and negative).

There's something awfully familiar about that description. I'm sure I've read
about it in a book somewhere.

Oh yes, that Mullard book about PAL television I read at school 40 years ago.

Rod.

[Back to original message]