Roland VXpanded VS-880 Application Manual page 132

MTC (MIDI Time Code)
MIDI Time Code is a synchronization signal that is
digitally sent through MIDI for synchronization of
absolute time between audio devices. Similar to
SMPTE, MTC can have different frame rates for
synchronization. See SMPTE for more details.
Mute
Reducing an audio signal to off (full attenuation).
Noise Gate
An electronic device that turns off or greatly
attenuates an audio signal when the level falls below
a user-adjustable threshold. Thus, program will pass
through, but low-level hiss, noise or leakage will not
be heard when the program is below threshold.
When the program is above threshold, the noise gate
has no effect on the signal.
Omni-Directional
Equal sensitivity in all directions. Usually refers to
non-directional microphones.
Out of Phase
When two related signals (or a single signal which
has been split) are offset in time acoustically or
electronically, they may be said to be out of phase
(larger offsets that enable two signals to be audibly
differentiated from each other are considered to be
time delays). Depending on the actual phase
difference, the out of phase signals may cancel or
reinforce one another when combined.
Out of Polarity
When two circuits are reversed in polarity with
respect to one another, sometimes they are
mistakenly considered to be 180 degrees out of
phase. Even though there is no real offset in signal
arrival time here, the result is similar to a true 180
degree phase difference - the singles will cancel one
another if combined. An example would be reversing
the speaker wires of one stereo speaker but not the
other. The reversed speaker is said to be "out of
polarity".
Out Take
A recording or segment of a recording that originally
was considered usable, but later was not used or was
discarded in favor of another recording of the same
program. Records are often made by recording a
given musical selection two or more times and then
selecting the best performance. The unused
recordings (takes) are considered to be out takes.
Outboard
Refers to electronic equipment or signal processors
that are not incorporated in the mixing console.
External equipment. Outboard equipment includes
special equalizers, delay lines, reverbs, compressors,
etc.
Output Assign
The routing of a signal from a given input position
(channel) to a particular output Buss or Busses.
Output Buss
A signal path to which a number of inputs may be
connected for feed to one or more outputs. In a
mixing console a Buss is usually a long piece of wire
to which any input channel may be connected by
means of a switch. The end of the wire goes into a
combining amplifier or summing amplifier which
then feeds one of the console outputs via an output
or line amplifier.
Output Channel
The final output of any multi-channel audio device.
In a mixing console, individual inputs can be routed
to different output channels via the output Busses In
a multi-channel tape recorder, each track of the tape
feeds its own tape recorder output channel.
Overdubbing
A recording procedure utilized in multi-track tape
recording. A performer (or performers) listens to
previously recorded musical tracks, typically with
headphones, while recording one or more additional
tracks on the same tape.
Overload
What occurs when a device is "asked" to supply
more power than it is capable of delivering; usually
caused by connection of too low an impedance to the
device's output. May cause distortion and/or
damage.
Pad
A passive resistor network which reduces the power
level of a signal. In some cases a pad is utilized to
match unequal input and output impedances for
proper interface.
Pan Pot
The control that places a signal in stereo perspective
to appear acoustically between the left and right
speakers.
PCM
Pulse Code Modulation. A process of digital
encoding of audio signals. PCM recordings are
synonymous with digital audio recordings (not to be
confused with PWM, pulse width modulation).
Chapter 8: Appendix
131