A notch, i.e., a dip, in the noise frequency spectrum characteristic of a device, such as a transmitter, receiver, channel, or amplifier, from external sources or internal sources.
Note: The noise window is usually represented as a band of lower amplitude noise in a wider band of higher amplitude noise. [From Weik '89]

1. In facsimile or display systems, such as television, a nonuniformity in the black area of the image, i.e., document or picture, caused by the presence of noise in the received signal.
2. A signal or signal level that is supposed to represent a black area on the object, but has a noise content sufficient to cause the creation of… (Read More →)

1. In facsimile or display systems, such as television, a nonuniformity in the white area of the image, i.e.,, document or picture, caused by the presence of noise in the received signal.
2. A signal or signal level that is supposed to represent a white area on the object, but has a noise content sufficient to cause the creation of… (Read More →)

The widest band of frequencies, inclusive of guard bands, assigned to a channel.
Note: Nominal bandwidth should not be confused with the terms "necessary bandwidth," "occupied bandwidth,"or "rf bandwidth. "

The rate at which stuffing bits are inserted when both the input and output bit rates are at their nominal values.

In facsimile systems, the average separation between centers of adjacent scanning or recording lines.

Signaling that is independent of an end-to-end bearer connection, including support for the functions of registration, authentication, and validation.

In personal communications service (PCS), terminal access to a network in which there is no set relationship between a terminal and the access interface.
Note: The access interface and the terminal each has its own separate "identifiers. " The terminal may be moved from one access interface to another while maintaining the terminal's unique identity. [After T1.244-1995]

See active video frame identification.

A code in which "1s" are represented by one significant condition and "0s" are represented by another, with no neutral or rest condition, such as a zero amplitude in amplitude modulation (AM), zero phase shift in phase-shift keying (PSK), or mid-frequency in frequency-shift keying (FSK).
Note: For a given data signaling rate, i.e., bit rate, the NRZ code requires only… (Read More →)