National Instruments NI Vision PCI-1409, Руководство пользователя, Страница: 29 / 40

Glossary
NI PXI/PCI-1409 User Manual G-2 ni.com
B
b Bit. One binary digit, either 0 or 1.
B Byte. Eight related bits of data, an 8-bit binary number. Also denotes the
amount of memory required to store one byte of data.
back porch The area of the video signal between the rising edge of the horizontal
synchronization signal (HSYNC) and the active video information.
black reference level The level that represents the darkest an image can get . See also white
reference level .
buffer Temporary storage for acquired data.
bus A group of conductors that interconnect individual circuitry in a computer,
such as the PCI bus; typically the expansion vehicle to which I/O or other
devices are connected.
C
C Celsius.
cache High-speed processor memory that buffers commonly used instructions or
data to increase processing throughput.
CCIR Comite Consultatif International des Radiocommunications. A committee
that developed standards for video signals. Also used to describe signals,
boards, and cameras that adhere to the CCIR standards.
chroma The color information in a video signal.
chrominance See chroma.
CMOS Complementary metal-oxide semiconductor.
CompactPCI Refers to the core specification defined by the PCI Industrial Computer
Manufacturer’s Group (PICMG).
conversion device Device that transforms a signal from one form to another. For example,
analog-to-digital converters (ADCs) for analog input and digital-to-analog
converters (DACs) for analog output.