See volume unit.

Techniques using fixed sequence permutations or voice/speech inversion to render speech unintelligible to the casual listener. [INFOSEC-99]

A device that is capable of accepting digital or analog data and developing intelligible speech sounds that correspond to the input data, without resorting to recorded sounds or without simply being a speech scrambler operating in reverse. [From Weik '89]

Pertaining to a circuit that was designed and used for speech transmission, but to which other uses, such as digital data transmission, facsimile transmission, telegraph, or signaling superimposed on the speech signals, have been added by means of multiplexing. [From Weik '89]

Operation in which speech and telegraphy (duplex or simplex) are transmitted simultaneously over the same circuit, and mutual interference is eliminated by the use of filters.

Pertaining to equipment that permits the use of part of a voice-frequency band for signaling.

The ratio of the speech power to the power of speech-correlated noise in a digital transmission system. [T1.501-1988]

A service feature that enables a switch or station to store certain telephone numbers and dial them automatically when a short (1-, 2-, or 3-digit) code is entered.

1. Synonym abbreviated dialing.
2. Dialing at a speed greater than the normal ten pulses per second.

The speed of an electromagnetic wave in free space, precisely 299,792,458 m/s.
Note 1: The preceding figure is precise because by international agreement the meter is now defined in terms of the speed of light.
Note 2: The speed of an electromagnetic wave, e.g., light, is equal to the product of the wavelength and the frequency.
Note 3: In any… (Read More →)