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Turnover frequency
Relates to filters and equalisers and is defined as frequency where the response has risen or fallen by 3dB. Sometimes called the 'corner frequency'
Band-stop Filter
A filter that removes or attenuates frequencies in a defined range or bandwidth, while letting through those frequencies both above and below the band. A wider form of notch filter.
Notch Filter
A filter which only removes a very narrow band of frequencies, or even a single frequency in extreme cases. A notch filter has an extremely high Q value (narrow bandwidth).
SDC
Small Diaphragm Capacitor microphone — a microphone with a diaphragm diameter of between about 10 and 15mm
LDC
Large Diaphragm Capacitor microphone — a microphone with a diaphragm diameter of more than about 20mm
LU
LU — Loudness Units. A measure of loudness normalisation relative to the target loudness. If the integrated loudness of a track measured -21LUFS, but the target loudness was -23LUFS, the meter would show a +2LU discrepancy.
Baxandall
A type of simple audio shelf equaliser or bass/treble tone control invented by English electronics engineer Peter Baxandall (1921-1995).
Tone Control
In hi-fi equipment 'tone controls' typically refers to bass and treble shelf equalisers, often using the Baxandall design. it may also refer to a low-pass filter in guitars and other electronic instruments.
Minimum Phase
A simplistic definition would be type of filter design where the frequencies are delayed by the least possible amount in their passage through the filter, but some frequencies will acquite greater phase shifts than others. Most analogue filters us
Pre-ringing
Pre-ringing refers to an inherent character of the impulse response of linear-phase filters employed in D-A or A-D converters. In a conventional analogue or minimum phase filter, an input impulse signal will generate an output impulse response with a strong initial spike followed by a string of ripples of decrasing magnitude. In a linear-phase filter the impulse spike is preceded by a build-up of ripples in advance of the impulse arriving, and a symmetrical string of decaying ripples afterwards.
Linear Phase
A type of filter design where the phase response is a linear function of frequency. In other words, all frequencies are delayed in their passage through the filter by exactly the same amount.
Diffusor
A form of acoustic panel employed in the acoustic treatment of a room which reflects incident sound in specific ways with the aim of maintaining an even spread of sound energy withint he environment. (More)
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Diffusion
Diffusion is the spreading of sound energy within an acoustic environment. It the context of acoustic treatment diffusion can be thought of as the opposite of absorbtion, and a range of diffusion panels and surfaces are available which are designed to reflect incident sound back into the room in various ways.