SoundCraft MBI 10 Series, User Manual

Page: 52 / 54

Glossary
Attenuation The reduction of a signal level. The attenuation is usually measured in dB.
Balance The relative levels of the left and right channels of a stereo signal.
Clipping The onset of severe distortion in the signal path, usually caused by the peak signal
voltage being limited by the circuit’s power supply voltage.
CMRR Common Mode Rejection Ratio. It 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 wanted signal.
dB (decibel) A ratio of two voltages or signal levels, expressed by the equation
dB=20LOG
10
(
V1
⁄
V2
).
Adding the suffix ’u’ denotes that the signal is relative to 0.775V RMS. Adding
the suffix ’v’ denotes that the signal is relative to 1V RMS.
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 amplifier to produce the
measured output noise.
EQ (Equaliser) A device which allows the cutting or boosting of selected bands of frequencies in
the signal path.
Gain The degree of amplification, or attenuation applied to a signal.
Hybrid A device which allows a telephone line to be connected to a broadcast desk in such
a way that the caller may hear the programme output without the caller’s voice being
re-introduced onto the phone line which would cause unwanted feedback.
LED Light Emitting Diode.
PAN An abbreviation of ’panorama’: it controls the levels sent to left and right outputs.
PFL (pre-fade listen) A function which allows the operator to monitor the pre-fade signal independently
of the programme mix.
TELCO TELephone COmmunication.
THD Total Harmonic Distortion.
46 Appendices