Re: MKIV CD noise analysis

[andrew.bennett@ns.sympatico.ca (Andrew Bennett)]

On Tue, 09 Mar 1999 23:41:00 -0600 Tom Droege wrote:

>... the full line time is 10.039 microseconds x the number of pixels
>in the line plus 1.826 milliseconds. 
With these revised figures I have finally found the 60Hz noise; it
comes out aliased at 16Hz. The faster pixel readout shifts the
frequencies of the other hash too; revised figures are:

18.7KHz  1.1 digits^2 No idea what the source might be!
21.7     0.8          These are all image d150004
37.5     0.5          I have not yet looked in this detail
40.4     0.7          at the other dark images.  

16Hz     0.3 digit^2  = 60Hz aliased
It is worth repeating that these noises are completely invisible
in the images that have any signal in them!

The gaps in the data viewed as a time series are no problem -
stay tuned for further details ... real soon now.

Andrew Bennett, Avondale Vineyard, Nova Scotia, Canada.