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Bass Reflex

A bass reflex loudspeaker employs a cabinet with a vent (or port) which allows some of the energy from the rear of the driver unit's diaphgram to supplement that from the front at low frequencies, improving the overall efficiency and allow a greater bass extension (but with a steeper roll-off) for a given size of cabinet.

PreSonus Studio One 5.2
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Studio One 5.2 released

Update adds improved handling of articulations, drum and tabulature scoring, enhanced Show Page and more.

Published 10/3/21

Shelf Equaliser

High and low shelf equalisers affect the high or low frequencies, respectively, raising  or lower the level of all frequencies in the corresponding band by the same amount. Consequently, the frequency response looks a bit like a shelf above or below the rest of the audio band. Sometimes also known as bass and treble tone controls.

Blumlein

Alan Dower Blumlein (1903-1942) was an electronics engineer who was instrumental in the development of stereo recording techniques and equipment in the 1930s when working for EMI. 

AM (Amplitude Modulation)

A means of convenying information on a carrier wave by varying its instantaneous amplitude. In an audio application, like AM radio, the wanted audio signal's amplitude is used to create corresponding deviations in the carrier wave's amplitude.  A demodulator can detect these deviations and thus recover the base-band audio signal. This form of modulation contrasts with frequency modulation (FM) where the carrier wave's amplitude remains constant but its frequency is varied to convey the wanted signal.

FM (Frequency Modulation)

A means of convenying information on a carrier wave by varying its instantaneous frequency. In an audio application, like FM radio, the wanted audio signal's amplitude is used to create corresponding deviations in the carrier wave's frequency.  A demodulator can detect these frequency deviations and convert them back to amplitude variations to recover the base-band audio signal. This form of modulation contrasts with amplitude modulation (AM) where the carrier wave frequency remains constant and its amplitude is varied to convey the wanted signal.

DC-Bias

Most Capacitor microphones work by storing a static charge within the capacitive capsule. The traditional way of building up that static charge is by applying an external DC voltage, and this is known as a DC-Bias. Typically, the voltage is around 60VDC, but greater voltages permit more headroom, and altering the voltage can also vary the sensitivity of the capsule which is useful in configuring multi-pattern mics. The most common alternative to DC-Bias is the Electret design where the static charge is provided by a dielectric material built into the mic itself. A third alternative is the RF-bias technique which works on a different principle altogether.

Audio Over IP

Also known as AoIP — an audio transfer system which routes multiple audio channels over an Ethernet network. There is a wide range of systems operating in slightly different ways, few of which are compatible. Some require independent and exclusive networks, while others can co-exist with existing Ethernet traffic. Examples of proprietary AoIP systems include, Ravenna, Dante, and many more, but there are also a few generic systems such as AVB

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