Erase
To remove recorded material from an analogue tape, or to remove digital data from any form of storage media.
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EuCon
A control protocol developed by Euphonix which operates at high-speed over an Ethernet connection. It is used between control surfaces and DAW computers to convey information about the positions of faders, knobs, and buttons and to carry display information.
Event
In MIDI terms, an event is a single unit of MIDI data, such as a note being turned on or off, a piece of controller information, a program change, and so on.
Exciter (cf. Enhancer)
An audio processor that works by synthesizing new high frequency harmonics.
Expander Module
A synthesizer with no keyboard, often rack mountable or in some other compact format.
FET
Field Effect Transistor. A solid-state semiconductor device in which the current flowing between source and drain terminals is controlled by the voltage on the gate terminal. The FET is a very high impedance device, which makes it highly suited for use in impedance converter stages in capacitor and electret microphones.
File
A container for stored digital data that usually has a meaningful name. For example, a Standard MIDI File is a specific type of file designed to allow sequence information to be interchanged between different types of sequencer.
Filter Frequency
The ‘turnover’ or ‘corner’ frequency of a high- or low-pass filter. Technically, the frequency at which the signal amplitude has been attenuated by 3dB.
FireWire
A serial computer interface format based upon the IEEE 1394 standard and named FireWire by Apple (Sony’s i.Link format is also the same interface). FireWire is used for high speed isochronous data transfer, including audio and video. FireWire 400 (IEEE 1394-1995 and IEEE 1394a-2000) or S400 interface transfers data at up to 400Mb/s and can operate over cables up to 4.5metres in length. The standard ‘alpha’ connector is available in four and six-connector versions, the latter able to provide power (up to 25V and 8 watts). The FireWire 800 format (IEEE 1394b-2002) or S800 interface uses a 9-wire ‘beta’ connector and can convey data at up to 800Mb/s.
Flanging
An effect which combines a modulated delay with the original signal, using feedback to create a dramatic, sweeping sound.
Flash Drive (see 'Solid-state Drive')
A large capacity solid-state memory configured to work like a conventional hard drive. Used in digital cameras and audio recorders in formats such as SD and CF2 cards, as well as in ‘pen drives’ or ‘USB memory sticks’. Some computers are now available with solid-state flash drives instead of normal internal hard drives.
Floppy Disk
An obsolete computer disk format using a flexible magnetic medium encased in a protective plastic sleeve.
Flutter
A high-speed variation in replay speed causing rapid 'fluttering' pitch variations. See Wow and Flutter or Scrape Flutter
Flutter Echoes
Short time-span sound echoes which can be created when sound waves bounce between opposite walls in a small or moderately sized room. A shorter version of the ‘slapback’ echo whch can be experienced in a larger hall when sound from a stage is reflected strongly from the rear wall.
Formant
The frequency components or resonances of an instrument or voice sound that doesn't change with the pitch of the note being played or sung. For example, the body resonance of an acoustic guitar remains constant, regardless of the note being played.
Format
A procedure required to ready a computer disk or digital tape for use. Formatting organises the medium into a series of ‘electronic pigeon holes’ into which data can be stored. Different computers often use different formatting systems.
Fragmentation (cf. defragment)
The process by which the available space on a disk drive gets split up into small, sometimes unusable, sections due to the storing and erasing of files.
Frequency
The number of complete cycles of a repetitive waveform that occur in 1 second. A waveform which repeats once per second has a frequency of 1Hz (Hertz).
Frequency Response
The variation in amplitude relative to the signal frequency. A measurement of the frequency range that can be handled by a specific piece of electrical equipment or loudspeaker. (Also see Bandwidth)
FSK
Frequency Shift Keying. An obsolete method of recording a synchronisation control signal onto tape by representing it as two alternating tones. (Also see timecode)