MIL-HDBK-1300A
dk. Frame - 1. For the MIL-STD-2045-44500 (TAC02), in data transmission, a sequence of contiguous bits bracketed by and including uniquely recognizable delimiters. 2. For the MIL-
STD-188-198A (JPEG), a group of one or more scans (all using the same DCT-based or lossless process) through the data of one or more of an image.
dl. Frame Check Sequence (FCS) - An error detection technique based on modular addition. Also a check value derived by using this technique.
dm. Frame header - The start-of-frame marker and frame parameters coded at the beginning of a frame.
dn. Frequency - For the MIL-STD-188-198A (JPEG), a two-dimensional index into the two-dimensional array of DCT coefficients.
do. Full-duplex - For the MIL-STD-2045-44500 (TAC02), an operational mode in which packets may be transferred simultaneously across a link in both directions.
dp. Galois field - An algebraic structure commonly used for error correction and cryptographics calculations. A Galois field is a field whose set of elements is finite. The field operations of addition, subtraction, multiplication, and division are defined.
geocenter.
dq. Geocentric latitude - The angle between the equatorial plane and the radius from the
dr. Geodetic latitude - The angle between the equatorial plane and the normal to the surface of the ellipsoid.
ds. Gray scale - An optical pattern consisting of discrete steps or shades of gray between black and white.
dt. Half-Duplex (HD) circuit - A circuit that affords communication in either direction but only in one direction at a time. Note: If the transmission direction is reversed sufficiently rapidly, a half-duplex circuit can effectively simulate full-duplex operation.
du. Hierarchical - A mode of operation for coding an image in which the first frame for a given component is followed by frames that code the differences between the source data and the reconstructed data from the previous frame for that component. Resolution changes are allowed between frames.
dv. Hierarchical decoder - A sequence of decoder processes in which the first frame for each component is followed by frames that decode an array of differences for each component and adds it to the reconstructed data from the preceding frame for that component.
dw. Hierarchical encoder - The mode of operation in which the first frame for each component is followed by frame that encode the array of differences between the source data and the reconstructed data from the preceding frame for that component.
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