Manual

Chapter 11 - Glossary
Redbox User Handbook 11-1
11. Glossary
1kHz 1000Hz or 1 kilohertz Tone of 1kHz is often used for line-up and testing.
ADSL Asynchronous Digital Subscriber Link - a broadband delivery system
over standard telephone lines (between the exchange and the user).
AES Audio Engineering Society.
AES/EBU Professional digital audio standard covering frame format, connections
and interfaces. Interface is usually on XLR sockets and plugs.
AM Amplitude Modulation - older analogue modulation standard used on
long, medium and short wave.
APT-X Data reduction process for reducing the amount of storage or bit-rate
need for audio.
ATRAC Adaptive Transform Acoustic Coding - the data reduction of compression
scheme used in Mini-disk machines.
Attenuation The reduction of a signal level. Attenuation is usually measured in dB.
B-Channel Bearer Channel - the main carrier channels used in ISDN.
Balance The relative levels of the left and right channels of a stereo signal.
Balanced Audio A way of sending audio over cable that protects it from induced
interference.
CAR See racks room.
CAT 5 Category 5 - type of cabling/connectivity standards used in computer
networking.
CD Compact Disc.
Cleanfeed A cleanfeed is a signal produced by a telco module on a mixer which is
used as the output to be fed back to a caller on a telephone line. The
cleanfeed is a sum of all the other signals which constitute the
programme output, except for the caller’s audio. A cleanfeed signal will
generally be of a better quality than a mix-minus signal.
Clipping The onset of severe distortion in the signal path, usually caused by the
peak signal voltage being limited.
CMRR Common Mode Rejection Ratio. This is the ratio of the extent to which a
differential amplifier will cancel noise, which is present on both inputs,
compared to its ability to amplify the signal.
CODEC COder-DECoder - used to change a signal from one format to anther
and back again.
Codecs Using digital circuits being offered by telecom providers, usually ISDN
(Integrated Services Data Networks) or other data transfer methods,
audio can be transferred with good to excellent quality over what
almost amount to dial-up telephone lines. The units operate by Coding
the audio into a digital data stream that can be transferred over the
digital circuit which is Decoded at the receiving end (Thus CoDec). By
using single or multiple circuits, very high quality audio can be
transferred from one place to another, even internationally.
Cross-talk This is the amount of a signal from a bus which appears, or is induced,
on a different signal. The problem is usually most prevalent with
adjacent channels.
DA Distribution Amplifier.
DAB Digital Audio Broadcasting = now called Digital Radio.