MIL-HDBK-1300A
ae. Block-row - A sequence of eight contiguous component lines that are partitioned into
8x8 blocks.
af. Blocked Image Mask - A structure which identifies the blocks in a blocked (tiled) image which contain no valid data, and which are not recorded/transmitted. The structure allows the receiver to recognize the recorded/transmitted order of the valid image blocks, and provides an offset for each recorded/transmitted block. For example, a 2 x 2 blocked image which contained no valid data in the second block (block 1) would be recorded/transmitted in the order: block 0, block 2, block
3. The blocked image mask would identify block 1 as a non-recorded/non-transmitted block, and would allow the receiving application to construct the image in the correct order.
ag. Bose-Chaudhuri-Hocquenchem (BCH) Codes - An important class of binary, block forward error correction (FEC) codes. BCH Codes offer a great deal of flexibility in terms of code rate and block length. Hamming codes may be thought of as single error-correcting BCH Codes.
ah. Briefing board - A briefing aid that includes an exploited, annotated hardcopy image and other textual and/or graphical material that presents significant intelligence information.
ai. Brightness - An attribute of visual perception, in accordance with which a source appears to emit more or less light. Note 1: Usage should be restricted to nonquantitative reference to physiological sensations and perceptions of light. Note 2: "Brightness" was formerly used as a synonym for the photometric term "luminance" and (incorrectly) for the radiometric term "radiance." For the purpose of NITFS, larger pixel values represent higher intensity, and lower pixel values represent lower intensity levels.
aj. Broadband - (synonym of wideband) 1. An imprecise designation of a signal that occupies a broad frequency spectrum. Note: This term is often used to distinguish it from a narrowband signal, where both terms are subjectively defined relative to the implied context. 2. That property of any circuit having a bandwidth wider than normal for the type of circuit, frequency of operation, and type of modulation carried. Note: The term has many meanings depending upon application. At audio/telephone frequencies, a bandwidth exceeding 4 KiloHertz (kHz) would be considered wideband. At High Frequency (HF) (3-30 MHz) radio frequencies, a bandwidth larger than 3 kHz would be considered wideband. In communications security systems, any bandwidth exceeding that of a nominal 4 kHz telephone channel is considered wideband. 3. That property of
any communication facility, equipment, channel, or system in which the transmitted bandwidth is greater than 0.1 percent of the midband frequency. 4. In commercial telephone usage, that property of a circuit having a bandwidth greater than 4 kHz.
ak. Broadcast operation - The transmission of information so that it may be simultaneously received by stations that usually make no acknowledgement.
al. Buffer - 1. A routine or storage used to compensate for a difference in rate of flow of data, or time of occurrence of events, when transferring data from one device to another. Note: Buffers are used for many purposes such as: (a) interconnecting two digital circuits operating at different rates, (b) holding data for use at a later time, (c) allowing timing corrections to be made on a data stream, (d) collecting binary data bits into groups that can then be operated on as a unit, (e)
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