Re: lynx-dev LYNX: Missing stuff, and no hint it is gone:

[Ismael Cordeiro]

On Mon, 28 Sep 1998, David Combs wrote:

> What is missing is the word after "with a period of".  You can tell from
> the English that something is missing, but there is no hint of what it
> might be -- a picture, a graf, who knows. Maybe the writer just left it
> out, typing fast without paying close attention, the way sometimes do
> myself, when actually there IS something there, Lynx just can't show it.
>
> It was only after several of these seeming ommissions that I
> decided to look via \.

If you had enabled links for all images you would have seen what was
"missing":

| Downsampling
|
|  [invis_anchor.xbm]-[invis_anchor.xbm] The dual operation of upsampling
|  is downsampling. It is defined as follows:
|
|    Definition: A downsampler is characterized by a resampling matrix
|    [_1940_tex2html_wrap2364.xbm] called the downsampling matrix. The
|    downsampling operation, with input [_1940_tex2html_wrap2342.xbm]
|    and output [_1940_tex2html_wrap2344.xbm] , is defined as
|
|    [invis_anchor.xbm]-[invis_anchor.xbm] [_1940_equation278.xbm]
|
|    and is denoted by [_1940_tex2html_wrap2346.xbm] .
|
|  A downsampler maps the input signal [_1940_tex2html_wrap2348.xbm] to
|  the output signal [_1940_tex2html_wrap2350.xbm] by discarding samples
|  of [_1940_tex2html_wrap2352.xbm] which do not lie on
|  [_1940_tex2html_wrap2354.xbm] and then compacts
|  [_1940_tex2html_wrap2356.xbm] onto [_1940_tex2html_wrap2358.xbm] .
|  Downsampling introduces aliasing and increases the sampling density by
|  a factor of [_1940_tex2html_wrap3136.xbm] , the downsampling factor.
|
|  The equivalent input/output Fourier transform relationship is
|
|  [invis_anchor.xbm]-[invis_anchor.xbm] [_1940_equation290.xbm]
|
|  where [_1940_tex2html_wrap2362.xbm] is a distinct coset vector of
|  [_1940_tex2html_wrap2364.xbm] so that [_1940_tex2html_wrap2366.xbm]
|  is the zero vector. The term [_1940_tex2html_wrap2368.xbm]
|  [_1940_tex2html_wrap2370.xbm] is called an aliasing vector. Aliasing
|  vectors are periodic with a period of [_1940_tex2html_wrap2372.xbm] in
|  each dimension. A normalized aliasing vector is an aliasing vector
|  with the [_1940_tex2html_wrap2372.xbm] term removed so it is periodic
|  with period 1 in each dimension.

Ismael
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       | ISMAEL CORDEIRO            | mailto:address@hidden           |
       | Production sound mixer     | http://www.cam.org/~ismael/     |
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