User Guide

Glossary
G - 17
Glossary
48 KHz and a resolution of 16 (20)
bits.
àAES/EBU.
Data compres-
sion
àCOMPRESSION, àDV, àMPEG,
àM-JPEG.
Data rate (data
stream)
Amount of data transmitted in a
certain period of time, usually
indicated in Mbits/s. In compari-
son with
àM-JPEG which indi-
cates the
àCOMPRESSION RATE,
àMPEG indicates the data rate
value. This value determines the
dimension of the applied data
reduction.
Data recorder
Recorders that enable recording
and playing of digital data by
means of a magnetic tape. Data
recorders are generally used for
archiving digital data permanently
as well as for backup purposes.
There are, however, also data
recorders that are used in video
technology, for example in the field
of server technology or archiving
of transmitted TV programs.
Additional coder/decoder to trans-
fer mere data into displayable
video signals are however neces-
sary. Different drives and formats
such as
àDST and àDLT are used.
dB
Logarithmic unit for measuring the
physical signal strength (voltage,
power, sound).
DCT compres-
sion
Discrete Cosine Transformation
DCT is a standard method for
compressing digital video images.
It serves as a basis for many data
reducing methods.
àJPEG, àDV
and
àMPEG depend on DCT.
DCT format
Digital video tape format where
digital component signals as well as
four sound Tracks are recorded.
DCT functions with a 3/4" (19
mm) wide technical pure iron tape
with a maximum recording time of
190 minutes. DCT was developed
by Ampex and is today applied in
the form of
àDST àDATA
RECORDERS.
DDR
Digital Disk Recorder àDISK
RECORDER.
Digital
In simple terms, one could say that
digital processes only know two
states: 1 or 0, yes or no. Continuous
phenomena like curves are subdi-
vided into sections and disaggre-
gated into single events.
Digital technology processes and
transmits data as information
packages. In contrast to analog sys-
tems, digital data can be identically
presented and stored (light, elec-
tricity, characters, magnetic parti-
cles) in different media (data
carriers). The accuracy of presen-
tation (resolution) is independent