Godfrey DiGiorgi wrote: > On Sep 2, 2006, at 7:51 AM, graywolf wrote: > > >>Supersonic means just above the human hearing range, ultrasonic means >>far above it but below the range of radio waves. Usually that is >>something like 15kc to 30kc for supersonic, and 30kc to 100kc for >>ultrasonic waves. It is the frequency that is important to the label, >>not the media. Note that the terms are used differently when used for >>aircraft rather than electronics. > > > That's rather imprecise. The dictionary defines "supersonic" and > "ultrasonic" as meaning: > > --- > ultrasonic > adjective > of or involving sound waves with a frequency above the upper limit of > human hearing. > > supersonic > adjective > involving or denoting a speed greater than that of sound. > --- > > These adjectives do not change meaning in the context of aircraft or > electronics, or anything else, and they do not compete with one another. > > If you go to http://www.dictionary.com and look them up, you'll see > quotations from 5-8 credible dictionary sources, only one of which > suggests the kind of tiering you allude as a possible alternative > definition to ultrasonic. > > Godfrey >
Godfrey, You should know that Jargon definitions are often at odds with what's in the Dictonary, and for good reason (Jargon must be precise, but doesn't tend to worry about namespace collision outside the field in which its used). This is Jargon. -Adam -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
