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Does AM MW/HF have a Pre/De-emphasis?
It is late and I have been up a little too long.
I have spent an hour wading through my reffrence books, and the ITU web pages. Earlier today I found a reffrence that states that the "standard Pre/De-emphasis is 75uS", and implies that this is also true for HF. I thought that 75uS was for non-Dolby FM,50Us for US TV and European FM and that MW/AM and HF/AM had no pre/de-emphasis. Have I lost what is left of my mind? I have been trying to decide on the best pivot point for my tone-tilt. Craig at Kiwa used 700Hz. The best diagram I found was from a guitar link and was designed to be used with spring reverbs and had the pivot at 1KHz. I have been experimenting and think I may have to have two, one for 700Hz for male voices, and one about 1.4KHz for females. Does anyone have and use a Kiwa MAP unit? Is the 700Hz too low to be really efective on female voices? Thanks Terry |