On Mon, 8 Feb 2016, Bertho Stultiens wrote: > Date: Mon, 8 Feb 2016 21:03:44 +0100 > From: Bertho Stultiens <ber...@vagrearg.org> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] Modbus wiring > > On 02/08/2016 08:52 PM, Nicklas Karlsson wrote: >>> Noise in analog will reduce the effective resolution, whereas noise in >>> digital can be easily filtered and the resolution stays constant. >>> Analog signals cannot be isolated easily and trying so results in >>> awkward non-linearities that need to be compensated. A digital signal is >>> easily isolated and does not require complex compensation. >> >> Yes analog signals certainly have problems in particular with >> isolation barriers and noise but replacing with high resolution and >> bandwidth require quite a lot of bits per second. > > It is a misconception, to think that the bandwidth of an analog channel > is higher than a digital one. It is actually reversed, where the > /effective/ bandwidth of a digital channel is higher than an equivalent > analog channel. > > The number of bits required goes to the root of Shannon's information > theory. We see how effective it is in our daily life everywhere and it > is better than analog. > > Telephony has been digitalized completely today. Television has > transitioned from analog to digital, freeing more than 50% of the > bandwidth, while increasing the number of channels. Radio will follow > (currently running parallel).
I would disagree here, many high speed transmission systems mix analog and digital techniques to get a higher bandwsith at a lower symbol rate (100BT ethernet uses MLT3 (3 level) and 1G Ethernet uses PAM5 with 5 signal levels) > > > -- > Greetings Bertho > > (disclaimers are disclaimed) > > ------------------------------------------------------------------------------ > Site24x7 APM Insight: Get Deep Visibility into Application Performance > APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month > Monitor end-to-end web transactions and take corrective actions now > Troubleshoot faster and improve end-user experience. Signup Now! > http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
