[BC] Re: Super Modulation and distortion

[Phil Alexander]

On 12 May 2005 at 9:13, Barry Mishkind wrote:

> At 06:49 AM 5/12/2005, Phil Alexander wrote
> >   Consider what
> >you might do with 250 W and +1000% a/k/a DSB, mostly suppressed carrier. <g>
> 
>          But, isn't asymmetrical modulation really distortion by definition.

Not if you are talking STRICTLY about the RF envelope.

> 
>          It has been too many years, but I seem to recall that past
>          around 150-170%, you are so asymmetrical that the
>          distortion becomes annoying to the listener.

Usually that's the problem, but I think that's a matter of how you get there. 
If the FCC hadn't put a limit on it I suspect we'd be doing it. I am not a DSP 
expert, but I'd think there should be a possibility for doing it that way. In 
analog it's difficult because the nonlinear break can't be sharp enough.

SSB works if the carrier reinjection is carefully controlled.
 
>          ....voice not included.

All voice is annoying enough as it is. <ggg>


Phil Alexander, CSRE 
Broadcast Engineering Services and Technology 
(a Div. of Advanced Parts Corporation) 
Ph. (317) 335-2065   FAX (317) 335-9037




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