Dangling Participles. Dangling participles (also known as dangling modifiers) sound more painful than they actually are. Consider the following sentences all of which contain dangling participles or dangling modifiers. In the sentence below, the modifying clause (Rushing to catch the bus) contains a participle (rushing).
S/N and (S+N)/N When measuring signal to noise ratio there are two basic elements to the measurement. One is the noise level and the other is the signal. As a result of the way measurements are made, often the signal measurement also includes noise as well, i.e. it is a signal plus noise measurement.
According to AT&T, the ringing signal is an 88v 20Hz A.C. signal superimposed on 48v nominal D.C. supervisory voltage. However, the actual ringing signal used can and does vary greatly from one location to another. The frequency of the AC signal is normally between 15 and 70Hz.