MIL-HDBK-1300A
t. Binary Phase Shift Keying (BPSK) - A type of modulation characterized is a sine wave which has one of two distinct phase values over each data interval.
u. Bit - Acronym for binary digit. (value of 0 or 1)
v. Bit Error Ratio (BER) - The number of erroneous bits divided by the total number of bits transmitted, received, or processed over some stipulated period of time. Note: Two examples of bit error ratio are: (a) transmission BER--the number of erroneous bits received divided by the total number of bits transmitted; and (b) information BER--the number of erroneous decoded (corrected) bits divided by the total number of decoded (corrected) bits. The BER is usually expressed as a number and a power of 10; e.g., 2.5 erroneous bits out of 100,000 bits transmitted would be 2.5 in 105 or 2.5 x 10-5.
w. Bit Error Ratio Test (BERT) - A function or sequence of functions that compares a received data pattern with a known transmitted pattern to determine the level of transmission quality. Note: Can be used as an adjective, for example, "Bit error ratio test packets" are packets used in a bit error ratio test.
x. Bit-mapped display - A type of memory mapped video where every pixel on the screen has one or more corresponding bits in memory.
y. Bit plane - A one-bit image constructed from the nth bit of each pixel in an image.
z. Bit rate - In a bit stream, the number of bits occurring per unit time, usually expressed as bits-per-second (BPS). Note: For M-ary operations, the bit rate is equal to log2M times the rate (in baud), where M is the number of significant conditions in the signal.
aa. Bit stream - A bit-stream is a sequence of binary digits. The term is principally used to describe data that is being moved internally within a computer, or being transferred between computers. For the purpose of MIL-STD-188-198A, Joint Photographic Experts Group (JPEG), a bit stream is defined as a partially encoded or decoded sequence of bits comprising an entropy-coded segment.
ab. Bit-stuffing - For NITFS, in High-level Data Link Control (HDLC), a technique used to avoid spurious appearances of the flag within a frame.
ac. Bits Per Second (BPS) - The number of bits passing a designated point in a system per second. Note 1: Values of data signaling rate in baud and in bits per second are numerically the same if, and only if, all of the three following conditions are met: (a) All pulses (bits) are of the same length; (b) all pulses (bits) are equal to the unit interval, the time element between the corresponding two significant instants of adjacent pulses; (c) binary operation is used. Note 2: In M-ary operation, bps equals modulation rate in baud multiplied by the logarithm to the base 2 of M, where M is the number of significant conditions in the signal.
ad. Block - For the purpose of MIL-STD-2500A, a block is a rectangular array of pixels. An image consists of the union of one or more nonoverlapping blocks. (Synonymous with tile.)
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