MIL-HDBK-1300A
k. Asynchronous transmission - Data transmission in which the instant that each
character, or block of characters, starts is arbitrary; once started, the time of occurrence of each signal representing a bit within the character, or block, has the same relationship to significant instants of a fixed time frame.
l. Automatic repeat-request - A system of error control for data transmission in which the receive terminal is arranged to detect a transmission error and automatically transmit a repeat-request (RQ) signal to the transmit terminal. The transmit terminal then retransmits the character, code
block, or message until it is either correctly received or the error persists beyond a predetermined number of transmittals.
m. Band - For the purpose of NITFS, used interchangeably with component. (See component.)
n. Bandwidth - 1. The difference between the limiting frequencies within which performance of a device, in respect to some characteristic, falls within specified limits. 2. The difference between the limiting frequencies of a continuous frequency band.
o. Baseband signal - 1. The spectral band occupied by an unmodulated signal. Note: Baseband transmission is usually characterized by being much lower in frequency than the signal that results if the baseband signal is used to modulate a carrier or subcarrier. 2. In facsimile, the
frequency of a signal equal in width to between zero frequency and maximum keying frequency.
p. Baseline (sequential) - A particular sequential DCT-based encoding and decoding process specified in this standard; required for all DCT-based decoding processes.
q. Baud - 1. A unit of modulation rate. One baud corresponds to a rate of one unit interval per second, where the modulation rate is expressed as the reciprocal of the duration in seconds of the shortest unit interval. 2. A unit of signaling speed equal to the number of discrete signal conditions, variations, or events per second. Note: If the duration of the unit interval is 20 milliseconds, the signaling speed is 50 baud. If the signal transmitted during each unit interval can take on any one of M discrete states, the bit rate is equal to the rate in baud times log2M. The technique used to encode the allowable signal states may be any combination of amplitude, frequency, or phase modulation, but it cannot use a further time-division multiplexing technique to subdivide the unit intervals into multiple subintervals. In some signaling systems, non-information- carrying signals may be inserted to facilitate synchronization; for example, in certain forms of binary modulation coding, there is a forced inversion of the signal state at the center of the bit interval. In these cases, the synchronization signals are included in the calculation of the rate in baud, but not in the computation of bit rate.
r. Bi-level image - Image information where each pixel is represented with one bit.
s. Bi-level overlay - A separate layer of graphical or textual information represented by one bit-per-pixel. This generally accompanies a separate layer of image information.
15
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business