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Entries found for search: L

aux or auxiliary : An assignable, line-level input with no dedicated input source. Generally refers to an input connector in a preamplifier or integrated amplifier, signal processor, mixer, effects device, etc. The aux input has no de-emphasis or other special equalization and accepts line-level signals. Tone controls onf a preamp usually also affect signals sent to the aux input.

auxiliary : A bus allowing a signal to be sent from a mixing desk prior to the main output, usually to provide an input to effects. See effects send.

auxiliary envelope : An extra envelope in a synthesizer that, instead of being hard-wired to a filter or amplitude, is intended as a modulation source that can be applied to various destinations.

auxiliary messages : A classification of MIDI messages which includes Active Sensing, All Notes Off, Local On/Off, and Reset, and which describes whether the particular MIDI device responds to any of thsese messages.

aural : Of, relating to, or perceived by the ear.

auto-assembly : In on-line editing, the process by which the edit-programmer produces the edited video master tape according to the instructions on the EDL, without human intervention. This is only possible where footage is consistently lit and exposed.

autolocator : A device for controlling the transport system of a tape recorder, allowing timecodetime code referencing such as SMPTE. Usually a number of locate points can be stored by the device. Some sequencers have an autolocate facility. Also called zero locate.

Automatic Volume Control /: See AVC.

audio silence : A type of diagnostic recording made with the recording set-up as planned, but with all faders down. Used to make a reference measurement of the noise floor and/or a tape of biased noise.

assemble editing : Editing of an audio or video program by making a master copy of the various takes, rather than physically splicing pieces of tape together. Virtually all digital editing is done this way. The opposite of insert editing.

assembly : See copyediting.

articulation : The way of characterizing notes (usually in a melody) by the precise control of their individual lengths to produce or eliminate gaps between them. The terms staccato and legato reflect the two extremes of articulation. It is one of the most important ways by which music can be shaped into phrases.

A-roll : Film footage used to introduce or provide backup material for a live video broadcast.

APRS Tape-Label System : The APRS has decided on a standard color-code for tape labelling:

AppleScript : A system-wide macro facility on Macs which gives operating system-level control for compatible applications.

Apple (�) menu : The main menu on a Mac, used to access system utilities (such as Keycaps), applications, files, and control panels. This is the equivalent of the Start menu on a PC-type system.

antiphonal : A term used to describe music that is played or sung in alternating sections by two separate groups of performers, widely separated.

anti-imaging filter : See reconstruction filter.

anti-aliasing filter : Before a signal is subjected to the process of A/D conversion, it must be passed through a lowpass brick-wall filter to remove any components that are higher than the Nyquist frequency. This is because it requires at least two samples per cycle to determine the existence and strength of a frequency component or the A/D process will create aliased signals. See reconstruction filter, decimation, FIR, IIR.

analog synthesis : See subtractive synthesis.

analog-to-digital converter : Commonly abbreviated A/D converter or just A/D. A device that changes the continuous fluctuations in voltage from an analog device (such as a microphone) into digital information that can be stored or processed in a sampler, DSP, or digital recording device.

analog sequencer : A sequencer into which sounds for storage and playback are fed as analog signals, via analog potentiometers.

analog recording : Any method of recording in which the recorded waveform is a continuous representation of the original signal, e.g., conventional magnetic tape recording.

analog : Capable of exhibiting continuous fluctuations. An audio signal is an electrical replica, or analog, of the waveform of the sound it represents. The voltage of the signal varies up and down (negatively and positively, in electrical terminology) the same way as the sound pressure varies up and down at the microphone. In an analog synthesizer, such parameters as oscillator pitch and LFO speed are typically controlled by analog control voltages rather than by digital data, and the audio signal is also an analog voltage. Compare with digital.

amp/speaker simulator : A filter circuit that mimics the amplifier and loudspeaker voicing of an electric guitar and amplifier system.

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