On Tue, Apr 21, 2020 at 09:53:12AM -0700, Len Ovens wrote: > Lots of stuff out there on this. I came across an article that proclaims: > "This worst-case example occurs when the audio tone is 1/4 of the sample > rate." That is for 48000SR a 12Khz peak. This seems unreasonable to me > though the idea that at 12Khz the peak could be as much as +3dbfs makes more > sense. It would seem to me that intersample peak posibility varies with > frequency and that the worst case would be 1/2 SR where the peak could be > infinite (in which case it would be rendered as 0). However, if everything > above 20k is filtered, that worst case is removed. In theory there is no limit. It is possible (and quite easy) to create a signal that produces *any* value of inter-sample peak you desire (assuming 'perfect' D/A conversion or upsampling). In practice (real world music signals), inter-sample peaks up to around 0.5 dB are observed. The EBU R128 meter specs require a peak warning at -1 dB FS. Ciao, -- FA _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx https://lists.linuxaudio.org/listinfo/linux-audio-user
