rbl;194876 Wrote: > I have set up my SB3 to use Inguz's DRC. However all I use it for is to > give a +4dB boost at 15Khz. However I find that if I play a pure sine > wave (have tried various frequencies, but say 100Hz) then it starts off > playing what sounds more like a square wave and in two steps gets better > to play what sounds like the proper sine wave. If I disable Inguz DSP in > filetypes the problem disappears. I have checked all settings are > disabled (incl room correction) except the boost at 15KHz. Oddly if I > turn this boost to 0dB the problem gets worse in that it takes longer > and more steps to settle to the true sine wave. > I am pretty sure the sine wave FLAC file is ok. > Any ideas?Yes. It's the nature of Finite Impulse Response (FIR) digital > filters.
The filter works by summing weighted contributions from a number of successive samples. When you start or stop the sine wave signal, the first or last half of the samples will all be zero (because the signal is zero). Hence, even though you are feeding the filter with a signal that should be passed unchanged, the first few and last few samples (how many depends on the filter length) will be changed. -- Patrick Dixon www.at-tunes.co.uk ------------------------------------------------------------------------ Patrick Dixon's Profile: http://forums.slimdevices.com/member.php?userid=90 View this thread: http://forums.slimdevices.com/showthread.php?t=34461 _______________________________________________ audiophiles mailing list [EMAIL PROTECTED] http://lists.slimdevices.com/lists/listinfo/audiophiles
