HP 8591C, Руководство пользователя, Страница: 336 / 373

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aural carrier
The carrier that has the audio portion of a television channel. A television
channel usually contains both a visual and aural carrier. An aural carrier
is sometimes referred to as a sound carrier.
auxiliary interface
An analyzer rear-panel connector that provides control lines and power
for external equipment. The auxiliary interface contains control lines A
and B. The voltage levels of control lines A and B are changed by some of
the HP 85721A’s tests.
bandwidth selectivity
This is a measure of the analyzer’s ability to resolve signals unequal in
amplitude. It is the ratio of the 60
bandwidth to the 3 bandwidth
for a given resolution filter (IF). Bandwidth selectivity tells us how steep
the filter skirts are. Bandwidth selectivity is sometimes called shape
factor.
battery-backed RAM
Random access memory (RAM) data retained by a battery. RAM memory
cards can contain data that is maintained with a battery. Refer also to
nonvolatile memory.
baud rate
A rate of transmission that is measured as signal events per time period.
The baud rate is equal to or greater than bits per second, since one bit
can consist of more than one signal event.
card reader
See memory card.
carrier-to-noise ratio
The ratio of the amplitude of the carrier to the noise power in the portion
of the spectrum occupied by the carrier. Also referred to as the C/N ratio.
CATV
Abbreviation for community antenna television or cable television system.
A cable television system is a broadband communications system that
provides multiple channels from centralized antennas.
Glossary-3