Handbook

Redbox User Handbook No 1
137
12
GLOSSARY
GLOSSARY
DAT Digital Audio Tape.
dB (decibel) A ratio of two voltages or signal levels, expressed by the equation
dB=20LOG(V1/V2)
Adding the sux “u” denotes that the signal is relative to 0.775V RMS.
Adding the sux “v” denotes that the signal is relative to 1V RMS.
DCF This is radio code signal sourced from Mainingen, near Frankfurt in
Germany, which can be used to automatically synchronize the
Sentinel+ audio logger and PC time to an accurate atomic clock,
European Time.
DDS & DDS and DDS-2 are world-wide standards established by Sony and
DDS-2 Hewlett-Packard which introduce many levels of error checking as data
is written to a DAT tape. DDS(-2) drives and tapes are used in security
products all over the world. 120m DDS-2 DAT tapes are more accurate
and reliable than DDS tapes and are able to store twice as much
audio data.
DI Direct Inject - a means of driving audio, usually from an instrument such
as a guitar, to allow the audio signal to be fed directly into a sound
desk input.
DLS Dynamic Label segment - a text message scheme used in digital radio,
usually to carry information about the programme. Like the radio-text
scheme used in RDS.
DSP Digital Signal Processing.
EBU European Broadcasting Union.
EIN Equivalent input noise. It is the ratio of output noise to the gain. It
describes the level of noise which would need to be fed into an ideal
amplier to produce the measured output noise.
ENG (Electronic news gathering). Machines that can record audio and
video information digitally.
EON (RDS) Enhance Other Networks - a scheme for switching a listener’s radio
to another Eective Radiated Power.
EQ (Equalisation). This is a method of cutting or boosting selected bands of
frequencies in a signal.
FM Frequency Modulation - a way of sending audio or data over a radio
carrier, the 88 - 108 Broadcast Band is often known as the FM Band.
FSD Full Scale Digits - This is the analogue representation of the maximum
digital value that the converter in question can see before digital
clipping occurs.
3G Third generation mobile telephone system that may allow broadband
transmission of Global Positioning System.
Gain The degree of amplication, or attenuation, applied to a signal.
GRAM Gramophone Reproducer - a turntable with a ‘pick-up’ amplier and
remote start interface.
HDLC High Speed Data Link.
Hybrid See TBU
IEC International Elecrotechnical Commision - often used to refer to a mains
connectivity standard, i.e. A type of plug/socket similar to that of a kettle,
used on most pro-audio equipment.
ISDN Integrated Services Digital Network - a system for sending high bandwidth
material over standard telephone lines.