On Friday 07 March 2014 17:34:15 Jaromír Mikeš did opine: > 2014-03-07 14:28 GMT+01:00 Jِrn Nettingsmeier > <nettings@xxxxxxxxxxxxxxxxxxx> > > > On 03/07/2014 01:48 AM, Jaromيr Mike¹ wrote: > >> Hi, > >> > >> I will got about 100 stereo wav files mixed hopefully in similar way > >> (loudness). > >> I need them process to meet ebur128 specification. > >> True peaks -3dB > >> RMS -23dB > > > > can i ask which broadcaster mandates -3dB true peak? that seems quite > > conservative. > > Czech TV ;) > > mira Humm, that peak is 7db below the average vu meter reading here, and we won't even look at a board that will not handle 20-24db peaks, preferable a solid +30dbm. But now, with everything digital, it seems the producers are all living by the old AM motto, the louder the better, and I can quite easily hear digital clipping that is less than 6 db above the average. That makes it pretty darned obvious, particularly when their excrement production gear does a sign inversion in an add/mix stage to go with the peak. How then do they handle the noise floor when they are running rms 27db below a lot of the rest of the planet? That means their broadcast gear has to have a -83db noise floor to hold the mandated noise floor over here of -60db or better. Best I ever saw was -66 and that was with the video modulation removed on a UHF transmitter. We could do that to get thru a Proof of Performance on UHF because the UHF amplifiers in those days were all klystrons, which if the video was on had so much Incidental Carrier Phase Modulation that the true intercarrier measured noise was usually in the high -40's, to very low -50's if the visual wasn't tuned for best efficiency. That was not often done because it had a very noticeable effect on the monthly power bill, which at best was in the $10,000 USD/month range for most stations. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> NOTICE: Will pay 100 USD for an HP-4815A defective but complete probe assembly. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
