Here's a Microsoft Excel '97 workbook file by John S. Allen which demonstrates
44.1 kHz sampling of a 21 kHz signal.
This Excel workbook accompanies John's to J. Peter Moncrieff's letter in the BAS Speaker, Volume 22, Number 5/6.
The workbook calculates 20 points for each sampling interval: one point every 1/882,000 second. Sample times are indicated
in the calculation worksheet by rows with green backgrounds. In the graphs, points between the calculated ones are plotted using Excel's smoothed line
interpolation. Excel graphs display rather poorly on a computer screen, but they print out very nicely.
To download the normal, uncompressed .XLS file (440k) click: 21kHz.xls
(If you have IE 5+ the file will open INSIDE the browser. To download the file itself, right click and select "save target as"
If you need an Excel VIEWER (only) from Microsoft, click HERE.
To download a zipped version of the file (109k) click: 21kHz.zip