Re: [SlimDevices: Audiophiles] Quick question about DAC "filters"
ralphpnj wrote: > Or maybe it's just that you happen to be human rather than SUPER-human > or an electronic measuring device and so are physically unable to hear > ultrasonic frequencies and pico second jitter. Nah, can't be that.. -- Hardware: 3x Touch, 1x Radio, 2x Receivers, 1 HP Microserver NAS with Debian+LMS 7.9.0 Music: ~1300 CDs, as 450 GB of 16/44k FLACs. No less than 3x 24/44k albums.. drmatt's Profile: http://forums.slimdevices.com/member.php?userid=59498 View this thread: http://forums.slimdevices.com/showthread.php?t=106979 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Quick question about DAC "filters"
ralphpnj wrote: > > How are these "filters" different from a simple graphic equalizer or > simple DSP or even, god forbid, tone controls? > When the sampling rate is increased, "images" of the original signal are created at higher frequencies - the up-sampling (anti-imaging) filters are intended to remove these. Any filter placed after the DAC up-sampling stage could do a similar job in principle. In fact NOS DACs rely on the fact that amps, speakers, ears - all after the DAC output - are natural filters. And even up-sampling DACs use a combination of digital and analogue anti-imaging filters. But if the filter is applied (e.g. with equaliser in a computer player) before up-sampling, it won't be doing the same job. You can -up-sample and filter- on a computer, and pass the music at the higher sample rate to the DAC. This could avoid a stage of up-sampling and filtering in a typical DAC (but with typical DACs there is more than one stage). Check it, add to it! http://www.dr.loudness-war.info/ SB Touch darrenyeats's Profile: http://forums.slimdevices.com/member.php?userid=10799 View this thread: http://forums.slimdevices.com/showthread.php?t=106979 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Quick question about DAC "filters"
The reconstruction filters used in up-sampling are anti-imaging (anti-aliasing filters are used in down-sampling, ADCs etc). In theory, no filter should make an audible difference if the transition band (the curved bit of the graph) is above audible frequencies. In practice, distortion is generated by content above audible frequencies, and this distortion can leak into the audible band. I believe this the only route for images, ringing etc to become audible. See here for an interesting discussion: http://www.pinkfishmedia.net/forum/showthread.php?p=3040013#post3040013 Check it, add to it! http://www.dr.loudness-war.info/ SB Touch darrenyeats's Profile: http://forums.slimdevices.com/member.php?userid=10799 View this thread: http://forums.slimdevices.com/showthread.php?t=106979 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Quick question about DAC "filters"
drmatt wrote: > I have a mytek DAC with such options. Upsampling on/off, filter > sharp/slow. Can't say, thus far, that I've noted any difference between > them. Perhaps I've not fed it any material that tickles the ultrasonic, > or jitter is not too bad in my system, or my tweeters behave well in the > presence of ultrasonics, or.. I'm just too old to hear anything that > high up.. Or maybe it's just that you happen to be human rather than SUPER-human or an electronic measuring device and so are physically unable to hear ultrasonic frequencies and pico second jitter. Living Rm: Transporter-SimAudio pre/power amps-Vandersteen 3A Sign. & sub Home Theater: Touch-Marantz HTR-Energy Veritas 2.1 & Linn sub Computer Rm: Touch-Headroom Desktop w/DAC-Aragon amp-Energy Veritas 2.1 & Energy sub Bedroom: Touch-HR Desktop w/DAC-Audio Refinement amp-Energy Veritas 2.0 Guest Rm: Duet-Sony soundbar Garage: SB3-JVC compact system Controls: iPeng; SB Controller; Moose & Muso Server: LMS 7.9 on dedicated windows 10 computer w/2 Drobos 'Last.fm' (http://www.last.fm/user/jazzfann/) ralphpnj's Profile: http://forums.slimdevices.com/member.php?userid=10827 View this thread: http://forums.slimdevices.com/showthread.php?t=106979 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
