binary coded decimal

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binary coded decimal

(BCD, packed decimal) A number representation where a number is expressed as a sequence of decimal digits and then each decimal digit is encoded as a four-bit binary number (a nibble). E.g. decimal 92 would be encoded as the eight-bit sequence 1001 0010.

In some cases, the right-most nibble contains the sign (positive or negative).

It is easier to convert decimal numbers to and from BCD than binary and, though BCD is often converted to binary for arithmetic processing, it is possible to build hardware that operates directly on BCD.

References in periodicals archive ?
TABLE I MAJOR SYNTHESIZER SPECIFICATIONS FOR THE AN/MPS-39 MOTR Frequency range (MHz) 1 to 250 Resolution (MHz) 0.2 Control binary-coded decimal Switching time ([[micro]seconds]) 6 Output level into 50 [ohms] (dBm) +10 Flatness (dB) [+ or -]0.5 Spurious signals (dBc) -68 Harmonics (dBc) -30 Phase noise (at any 105 at 100 Hz output frequency) 115 at 1 kHz (dBc/Hz) 123 at 10 kHz 127 at 100 kHz Switching behavior phase coherent Despite this definition, the assumption that all contemporary systems that use a single standard (external or internal) are coherent is incorrect.
From the user's perspective, the filter can be controlled using one of several digital interfaces, including binary-coded decimal, general-purpose interface bus (GPIB), RS-232, parallel and custom interfaces.