Talk:Pulse-amplitude modulation

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IMHO, the diagram on this page should be remade in PNG format rather than JPG; the image suffers from terrible JPG artifacting. --Jonathan Drain 19:53, 23 Nov 2004 (UTC)

In my opinion, the image isn't useful at all. It's a "graph" of four numbers. I removed it. dbenbenn | talk 07:20, 30 Jan 2005 (UTC)

Factual inaccuracies and distortion.[edit]

The following was removed from the article:

Pulse-amplitude modulation is widely used in baseband transmission of digital data, with non-baseband applications having been largely superseded by [[pulse-code modulation]], and, more recently, by [[pulse-position modulation]].

Because

  1. PAM is not digital. PAM is analogi in level and discrete in time. PCM is discrete in level and discrete in time.
  2. While PCM has superceded PAM, PPM has not superceded PCM (PCM is still widely used).

If somebody wants to rework the sentence, please do so. Otherwise, I can do it later. Meanwhile, we should not have factual inaccuracies in the article. Ra2007 (talk) 16:14, 17 December 2007 (UTC)

I just reverted myself because there are some sources incorrectly defining PAM as a PCM. Strictly speaking, PAM can have any real value in amplitude, while PCM is discrete. So-called N-level digital PAM is not PAM, though it is similar. Givin contradictions between some sources, this article, and reliable sources, it might take a bit of time to sort this out. Ra2007 (talk) 16:22, 17 December 2007 (UTC)

"A special technique"???[edit]

In the Use in Ethernet section, the sentence, "A special technique is used to reduce inter-symbol interference between the unshielded pairs." is pretty useless. Marking it with "Citation needed". Ideally, the a link to the actual technique, or at least the *name* of the technique, would be included. — Preceding unsigned comment added by Brandon.irwin (talkcontribs) 17:31, 20 June 2011 (UTC)

I've cleaned up the Ethernet section and removed this. There is a lot of detailed information about the modulation in the linked articles: 100BASE-TX, 1000BASE-T and 10GBASE-T. ~KvnG 15:00, 2 March 2015 (UTC)