Image:Audio curves graph.png
From Wikipedia, the free encyclopedia
No higher resolution available.
Audio_curves_graph.png (624 × 547 pixels, file size: 3 KB, MIME type: image/png)
[edit] Summary
Comparison of two audio curves in two-way radio receivers. Please credit David Jordan when using this image. The magenta line is a commercial two-way radio without a CTCSS filter. The blue line is an imported communications receiver. Some trade journal articles say idealized audio curves differ from one language to another. One article said US hand-held radios had their audio response altered to work with an Asian language.
This curve was plotted (in the 1980s) by setting a signal generator to generate a carrier on the receiver's channel with a 1,000 Hz tone at two-thirds system deviation. The receive audio was terminated into a transformer matching the specified speaker impeadance. Volume was set for 2 volts across the transformer. Without changing the generator's deviation level, voltage was measured at each frequency along the graph's bottom edge. The numbers were plugged into a spreadsheet and plotted.
[edit] Licensing
 |
I, the creator of this work, hereby grant the permission to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. Subject to disclaimers. |
[edit] Automatically converted to PNG
The PNG crusade bot automatically converted this image to the more efficient PNG format. The image was originally uploaded as "Audiocv.gif".
[edit] Previous file history
22:14:49, 23 September 2006 . . David Jordan (Talk | Contribs) . . 624x547 (6,701 bytes) (Comparison of two audio curves in two-way radio receivers. Please credit David Jordan when using this image. The magenta line is a commercial two-way radio without a CTCSS filter. The blue line is an imported communications receiver. )
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Dimensions | User | Comment | |
|---|---|---|---|---|
| current | 05:17, 6 February 2007 | 624×547 (3 KB) | PNG crusade bot (Talk | contribs) | (__NOTOC__ == Summary == Comparison of two audio curves in two-way radio receivers. Please credit David Jordan when using this image. The magenta line is a commercial two-way radio without a CTCSS filter. The blue line is an imported communications receive) |
- Search for duplicate files
- Edit this file using an external application
See the setup instructions for more information.
