[BC] Is overprocessing illegal?

[Phil Alexander]

On 25 Dec 2006 at 12:42, Jerry Mathis wrote:

> For mono FM, your
> "audio" can go as high frequency-wise as you want. Just remember the 75
> microsecond pre-emphasis, though. All that high-frequency garbage will rob
> you of modulation capability. 

There is no requirement for running 75us preemphasis, except the receivers 
in the market mostly have deemphasis installed. The FCC requirement is not
running preemphasis > 75us. If you want to run flat, 25, 50 or 75, or 
anything between, that is your choice. Originally that requirement was 
deleted with the idea that broadcasters would reduce the amount of 
preemphasis over time, but it never happened.

Merry Christmas,

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