2: Glossary - Phonic MM1705a User Manual

Feedback
A howling sound caused by placing a microphone
too close to a loudspeaker driven from its amplified
signal.
Frequency response
The variation of frequencies in a device.
Gain/input sensitivity
The variation in signal level.
Highpass filter
A filter that rejects low frequencies.
Insert
A break point for the connection of an external de-
vice in the signal path. For example, signal proces-
sors or another mixer.
Pan
Or panorama; controls levels sent to left and right
outputs.
Peaking
A bandpass response of an equalizer response curve
affecting only one band of frequencies.
PFL (Pre-fader-Listening)
A function that allows the operator to monitor the
pre-fade signal on an independent channel of the main
mix.
Phase
A term used to describe the relationship between 2
signals. Signals that reinforce each other are In-
phase; signals that cancel each other are out-of
phase.
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Polarity
The positive and negative poles of an audio connec-
tion. Usually connections are made with positive to
positive and negative to negative.
Post-fader
The point in the signal path after the monitor or mas-
ter fader and therefore affected by fader position.
Pre-fader
The point in the signal path before the monitor or mas-
ter fader and therefore not affected by fader position.
Roll off
A fall in gain at the extremes of the frequency re-
sponse.
Shelving
An equalizer response which affects all frequencies
above or below the break frequency.
Stereo return
An input specifically for the receiving of other external
devices.
Transient
A temporary rise in the signal level.
Unbalanced
A single wire audio connection method that uses a
screen as a signal return. This method does not pro-
vide the noise immunity of a balanced input.
+48V
the phantom power supply for channel mic inputs, for
condenser microphones and active DI boxes.
MM1705a USER' S MANUAL
APPENDIX
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